CN108809609B - A DMRS indication and receiving method, transmitter and receiver - Google Patents

Abstract

This application discloses a kind of DMRS instruction and the received method and devices of DMRS, the described method includes: transmitting terminal determines DMRS configuration information corresponding with current DMRS transmission plan from multiple groups demodulated reference signal DMRS configuration information, and DMRS instruction information is obtained according to DMRS configuration information；Every group of DMRS configuration information includes a plurality of DMRS configuration information；The transmitting terminal sends the DMRS and indicates information.Implement method and apparatus provided by the present application, matched with the several scenes of NR, can satisfy the demand of the data transmission of higher number, instruction expense can be further decreased.

Description

A DMRS indication and receiving method, transmitter and receiver

technical field

The present application relates to the field of communications, and in particular, to a demodulation reference signal (demodulation reference signal, DMRS) indication and reception method, a transmitter and a receiver.

Background technique

Multiple-input multiple-output (English full name: Multiple-Input Multiple-Output, English abbreviation: MIMO) technology utilizes the resources of the spatial dimension, and can enable the signal to obtain array gain, multiplexing and diversity gain in space without increasing the system bandwidth. As well as the interference cancellation gain, the capacity and spectral efficiency of the communication system are increased exponentially. For example, in a Long Term Evolution (English full name: Long Term Evolution, English abbreviation: LTE) system, a single user (single user, SU) supports a maximum of 8 layers of orthogonal DMRS port multiplexing, and the DMRS occupies 24 REs. Specifically: in the frequency domain, the DMRS ports can be mapped on the 0th, 1st, 5th, 6th, 10th, and 11th subcarriers of each resource block (resource block, RB) pair; in the time domain, the DMRS ports Ports can be mapped on 5, 6, 12 and 13 symbols per subframe. As shown in Figure 1.

However, with the continuous improvement of people's communication requirements for high speed, high reliability and low delay, modern communication systems will always face the challenges of larger capacity, wider coverage and lower delay, and these requirements have also become the future network (English). Full name: new radio, English abbreviation: NR) key requirements.

In the demodulation process of the receiving end of the communication system, compared with the non-coherent demodulation, the coherent demodulation performance is better, and has the advantage of about 3dB, so the coherent demodulation is more widely used in the modern communication system. However, the modulation of each carrier in the OFDM system suppresses the carrier, and the coherent demodulation at the receiving end requires a reference signal, also known as a pilot signal or a reference signal (English full name: Reference Signal, English abbreviation: RS), which are in the The OFDM symbols are distributed on different resource elements (full English name: Resource Element, English abbreviation: RE) in the time-frequency two-dimensional space, and have known amplitudes and phases. Also in a MIMO system, each transmit antenna (virtual antenna or physical antenna) has an independent data channel. Based on the predicted RS signal, the receiver performs channel estimation for each transmit antenna, and restores the transmit data based on this.

Channel estimation refers to the process of reconstructing the received signal in order to compensate for channel fading and noise. It uses the RS predicted by the transmitter and the receiver to track the time and frequency domain changes of the channel. For example, in order to realize the data demodulation of the high-order multi-antenna system, the LTE/-A system defines a demodulation reference signal (full name in English: Demodulation Reference Signal, English abbreviation: DMRS), which is used for uplink and downlink control channels and data channels. Such as demodulation of physical downlink shared channel (full English name: Physical Downlink Share Channel, English abbreviation: PDSCH).

DMRS and user data use the same preprocessing method, which is characterized by:

1) User-specific (UE-specific), that is, each terminal data and its corresponding demodulation reference signal use the same precoding matrix.

2) From the network side, the DMRS transmitted by each layer are orthogonal to each other.

3) DMRS is generally used to support beamforming and precoding technology, so it is only sent on the scheduled resource blocks, and the number of transmissions is related to the number of data streams (or layers), and corresponds to the antenna ports one-to-one, while The number of non-physical antennas, the former is less than or equal to the latter, and the two are linked through layer mapping and precoding.

In the current standard, the maximum number of orthogonal data streams that can be supported by using DMRS in downlink is 8, the resource overhead in each PRB pair is 24 Re, and the DMRS is distributed in each PRB in the form of block pilots. Each port (port) occupies 12 REs, that is, the port density is the same. At the same time, the sequence design of DMRS is determined according to the density of each port, so its length is a fixed value.

However, the scenarios supported by the new radio interface (full name: New Radio, abbreviation: NR) are more diverse, so it will support multiple patterns. For example, in order to adapt to data transmission in different frequency bands, the multiplexing method will have great different. Moreover, in order to further meet the larger capacity transmission requirements, the maximum number of orthogonal data streams that can be supported by the DMRS of the data channel will be greater than 8. For example, the 3gpp RAN1#88bis conference already supports orthogonal 12 DMRS ports.

In addition, compared with the LTE system, the transmit and receive antennas are very low, so the MU dimension supported by MU pairing is low. For example, during MU scheduling, the maximum number of layers allowed for a single user is 2, and the total number of orthogonal layers is 4 Floor. However, in the future network, the 4RX terminal may exist as the baseline of the receiving antenna dimension, and the MU dimension will change at this time.

In actual transmission, the base station needs to inform the terminal of the number of layers allocated, DMRS port number, sequence configuration, multiplexing mode and other information. In LTE, this information is indicated by DCI. However, NR already supports a variety of patterns, and there are various changes in the number of ports, multiplexing methods and mapping rules. Following the DCI indication method of LTE will cause a lot of overhead. Therefore, how to indicate DMRS in NR is a technical problem that needs to be solved urgently.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present application provides a method and apparatus for indicating and receiving a demodulation reference signal.

In the MU-MIMO scenario of the NR system, the CDM multiplexing orthogonal ports that it can support are different from those in LTE, and can support up to 12 orthogonal ports. Therefore, in LTE, only one DMRS configuration information table is used to inform the terminal. The number of layers allocated, the DMRS orthogonal port number, the sequence configuration, the multiplexing method and other information methods are no longer applicable. In this embodiment of the present application, multiple groups of DMRS configuration information are designed to match different future networks (new radio, NR) respectively. Scenario DMRS transmission requirements.

On the one hand, the method for indicating and receiving a demodulation reference signal provided by this application includes:

The transmitting end determines the DMRS configuration information corresponding to the current DMRS transmission scheme from the multiple groups of demodulation reference signal DMRS configuration information, and obtains the DMRS indication information according to the DMRS configuration information; the described each group of DMRS configuration information includes multiple pieces of DMRS configuration information; then Send DMRS information to the receiving end; after receiving the DMRS indication information, the receiving end demodulates the auxiliary data.

In the embodiment of the present application, the current DMRS transmission scheme is indicated by indication information; different DMRS transmission schemes correspond to different maximum numbers of orthogonal ports that can be supported, or different corresponding DMRS patterns or corresponding DMRS configuration types.

The maximum number of orthogonal ports that can be supported in the DMRS configuration information corresponding to the different DMRS transmission schemes is different.

The lengths of the DMRS indication information corresponding to the different DMRS transmission schemes are different.

The multiple DMRS ports in the at least one piece of DMRS configuration information belong to different code division multiple access CDM groups, wherein different CDM groups satisfy a non-quasi-co-located QCL relationship.

In an implementation manner, different groups of DMRS configuration information can be configured for different maximum number of orthogonal ports that can be supported, and the group of DMRS configuration information includes multiple pieces of DMRS configuration information; for example, for the maximum number of orthogonal ports that can be supported is 4. , the number of orthogonal ports is 6, the number of orthogonal ports is 8, and the number of orthogonal ports is 12 MIMO scenarios, configure the corresponding DMRS configuration information respectively, the DMRS configuration information is to let the receiver know the DMRS orthogonal ports it can use number, sequence configuration, multiplexing mode, etc. for correct data decoding.

In another implementation manner, the DMRS configuration information is configured for different DMRS patterns. Generally speaking, one DMRS pattern corresponds to a type that supports the maximum number of supportable orthogonal ports or the maximum number of supportable orthogonal transmission layers. In the MIMO scenario, the DMRS pattern indicates how many orthogonal orthogonal port groups it supports, and how many resource units each orthogonal port group consists of. The receiving end knows the DMRS orthogonal port number, sequence configuration, multiplexing mode, etc. that it can use, so as to perform correct data decoding.

In an implementation manner of the first aspect, the DMRS configuration information may be presented by a protocol agreement table, and its specific implementation form may be a downlink control information (downlink control information, DCI) table (table), and multiple DCI tables at least Contains a set of different DMRS configuration information; a set of DMRS configuration information contains multiple pieces of DMRS configuration information, which are presented in a table, which is referred to as a DMRS configuration information table herein.

The DMRS transmission scheme corresponding to the DMRS information is sent through high-level signaling such as radio resource control (RRC) signaling, and of course it can also be bound with other configuration parameters corresponding to the scene, such as frequency, carrier spacing, frame structure, etc. The DMRS indication information may be sent through DCI signaling or a media access control control element (media access control control element, MAC CE).

In a specific implementation, each DMRS configuration information table corresponds to a different maximum number of orthogonal ports that can be supported. For example, the maximum number of orthogonal ports that can be supported can be at least two of {4, 6, 8, and 12}. ;

In another implementation manner, each DMRS configuration information table may correspond to a different DMRS pattern (pattern) or DMRS configuration type (configuration type).

In an implementation manner, the DMRS configuration information table is designed according to the orthogonal port combination, for example, the orthogonal port combination of less than or equal to the 4-layer transmission layer, the Combined column design;

In an implementation manner, when the DMRS configuration information is presented in the form of a DMRS configuration information table, it may be divided according to the number of codewords (codeword number), or may not be divided according to the number of codewords, but according to the total The maximum number of orthogonal ports that can be supported can be divided according to the number of transmission layers at the receiving end. Specifically, it can be divided according to a certain proportion.

The DMRS configuration information table also includes indication information of the total number of orthogonal ports, and the indication information may indicate the number of all orthogonal ports that may actually appear, or the quantized value of the number of all orthogonal ports that may actually appear. The quantized value of the number of all orthogonal ports may be DMRS orthogonal layer number information, or DMRS antenna orthogonal port set indication information, or CDM group information of DMRS antenna orthogonal ports, or information generated according to the CDM size. It should be understood that the total number of orthogonal ports is the same as the total number of orthogonal DMRS transmission layers. The CDM group information of the orthogonal port of the DMRS antenna may be the number of CDM groups or the CDM group number or CDM group status information.

It should be noted that the multiple groups of DMRS configuration information can be presented by a general information table, that is, the multiple DMRS configuration information tables can be a general information table, and this general information table supports the maximum supported The number of orthogonal ports. Multiple DMRS configuration information tables are subsets of the general information table. Selecting subsets from the general information table can be selected according to the maximum number of orthogonal ports that can be supported, DMRS patterns, or high-layer signaling.

Wherein, the CDM group information of the DMRS antenna orthogonal port in the DMRS configuration information is CDM group status information or CDM group serial number or CDM group number or CDM group number; in an implementation manner, the CDM group number is The CDM group that is co-scheldued in the system.

The DMRS configuration information in the DMRS configuration information further includes symbol information of the DMRS.

The usable range of the DMRS configuration information is configured through RRC signaling, and the usable range is determined based on the symbol information of the DMRS or the maximum number of symbols of the DMRS.

Wherein, the usable range of the DMRS configuration information is bound with a parameter in the radio resource control signaling RRC indicating the maximum number of DMRS symbols.

When the maximum number of DMRS symbols is different, the length of downlink control information DCI signaling for DMRS port scheduling is different, or the number of DCI bits is different, or the DCI field is different.

Wherein, when single-user SU scheduling is performed by using the DMRS configuration information, FDM scheduling is performed first in two CDM groups. Can support up to 12 orthogonal ports. A terminal usually needs to know the port information of other terminals that are co-scheduled, so as to obtain which RE positions are occupied by the DMRS of the ports used by other terminals, and will not transmit its own data. If the terminal cannot obtain the information, the terminal will demodulate the DMRS of other users as its own data, resulting in a decoding error. How to make the terminal know which DMRS of ports are occupied requires an effective DMRS rate matching indication method. In order to solve this technical problem, the present application provides a demodulation reference signal indication method and receiving method, including:

The transmitting end generates demodulation reference signal DMRS indication information; the DMRS indication information is used to indicate resources that are not occupied by DMRS in the resources that can be used to bear DMRS; the transmitting end sends the DMRS indication information to the receiving end; DMRS indication information, data demodulation is performed on resources not occupied by DMRS. Specifically, the receiving end needs to receive the DMRS indication information through the downlink control information or the medium access control control unit

According to the received DMRS indication information, the receiving end obtains the quantized current number of orthogonal transmission layers, or the currently used port group state combination, or the current number of orthogonal transmission layers or port group states not used by the receiving end, or needs to be The muted resource elements are used to obtain resources that are not occupied by the DMRS among the resources that can be used to bear the DMRS.

In an implementation manner, before receiving the DMRS indication information, the receiving end also receives the DMRS transmission scheme indication information indicating the current DMRS transmission scheme; the maximum number of supported orthogonal ports corresponding to different DMRS transmission schemes is different, or the corresponding DMRS patterns or corresponding DMRS configuration types are different.

It should be understood that the DMRS transmission scheme is embodied by the DMRS pattern or DMRS configuration type or the maximum number of orthogonal ports that can be supported.

It should be noted that the maximum number of orthogonal ports that can be supported here is the maximum number of orthogonal ports that the transmitter can schedule in the current frame. For example, a 12-port DMRS pattern can be used, but the current maximum number of scheduled ports is only 4. The maximum number of orthogonal ports that can be supported is related to base station scheduling, and is less than or equal to the maximum number of orthogonal ports supported by the DMRS pattern.

For example, for MU-MIMO scenarios where the maximum number of orthogonal ports that can be supported is 4, 6, 8, and 12, or for scenarios where the number of non-orthogonal ports is 8, 12, 16, and 24 (scenario with 2 scrambling codes) , that is, according to the different maximum number of orthogonal ports that can be supported, the corresponding DMRS indication information is configured respectively. The indication information is to let the receiving end know which resource units in the time-frequency resources are occupied by the DMRS of other users and do not have their own data. , the receiving end can avoid these resource units during data demodulation, so as to perform correct data decoding.

In another implementation manner, the DMRS indication information is configured for different DMRS patterns, and may also be configured corresponding to the number of DMRS port groups in the DMRS pattern (for example, there may be two tables corresponding to the DMRS patterns containing two or 3 DMRS port groups.).

Generally speaking, a DMRS pattern corresponds to a MU-MIMO scenario that supports the maximum number of orthogonal ports that can be supported. The DMRS pattern indicates how many orthogonal CDM port groups it supports, and how many port groups each It is composed of resource units, so different indication information is configured for different DMRS patterns.

In another implementation manner, the indication information may also be configured for a DMRS configuration type (configration type).

All of the above methods can let the receiving end know which resource units are occupied by the DMRS of other users in the time-frequency resources, so that the receiving end can correctly perform data demodulation.

In an implementation manner, the receiving end needs to receive the correspondence between the DMRS indication information sent in a signaling manner and the resources that are not occupied by the DMRS among the resources that can be used to bear the DMRS. The signaling mentioned here is usually higher layer signaling, such as RRC signaling.

In another implementation manner, the local receiving end also stores DMRS configuration information, that is, the corresponding relationship between the DMRS indication information and the resources that can be used to bear DMRS that are not occupied by DMRS is in the locally stored DMRS configuration information. can be found.

The DMRS configuration information in this embodiment of the present application further includes indication information of the total number of orthogonal ports, and the indication information of the total number of orthogonal ports may indicate the number of all orthogonal ports that may actually appear, or the number of all orthogonal ports that may actually appear. The quantized value of the number. The quantized value of the number of all orthogonal ports is DMRS orthogonal layer number information, or DMRS antenna orthogonal port set indication information, or CDM group information of DMRS antenna orthogonal ports, or information generated according to the CDM size. The CDM group information of the orthogonal port of the DMRS antenna is the number of CDM groups or the CDM group number or CDM group status information.

Wherein, in the DMRS orthogonal layer number information, the DMRS orthogonal layer number is an integer multiple of the number of DMRS antenna ports in a CDM group; or an integer multiple of the number of DMRS antenna ports with consecutive serial numbers in a CDM group ; or the value of the serial number of the DMRS antenna port in a CDM group. In a specific implementation, the DMRS layer number information may be binned and quantized DMRS layer number information. In the binned quantized DMRS layer number information, the DMRS layer number may be an integer multiple of the number of DMRS antenna ports in a CDM group. For example, for a DMRS pattern with two DMRS antenna port groups, assuming that port group 1 includes DMRS ports {1, 2, 3, 4}, and port group 2 includes DMRS ports {5, 6, 7, 8}, you can Quantization is 4 layers and 8 layers. In addition, in the information on the number of DMRS layers, the number of DMRS layers may also be an integer multiple of the number of consecutive DMRS antenna ports in a CDM group in order from small to large, for example, for a CDM group {1, 2, 5, 7 } and {3, 4, 6, 8}, which can be quantized into 2 and 4 layers. All these information allow the receiving end to identify which resource units are occupied by the DMRS of the receiving end, and which resource units are occupied by the DMRS of other receiving ends that are multiplexed by CDM, and the remaining resource units are used for the receiving end. Therefore, the receiving end performs data demodulation on the corresponding resource unit.

The reason why the quantized value of the number of orthogonal transmission layers is used is because if you want to indicate the specific number of transmission layers at the receiving end, for example, if you want to indicate the number of transmission layers {1, 2, 3, 4}, 2 bits are needed to indicate , and quantize the number of transmission layers {1, 2, 3, 4}, for example, quantize up to the number of transmission layers of 4, or down quantize to the number of transmission layers of 1, or use 2 or 3 to represent the number of transmission layers in the group { 1, 2, 3, 4}, the quantization value indicating the number of transmission layers only needs one bit to indicate, for example, 0 is used to indicate the quantization value of the number of transmission layers 4, so the indication overhead can be reduced.

Based on the above-mentioned principle, the DMRS indication information in this embodiment of the present application may indicate the quantization value of the number of orthogonal transmission layers. One way is implicit indication, and the other way is explicit indication.

In the implicit indication scheme, the quantization value of the number of orthogonal transmission layers is configured in the DMRS configuration information table, and the indication information is indicated by the DMRS indication information (value) in the DMRS configuration information table; the DMRS configuration information table can be used with Similar in LTE, for example, the number of antenna ports (Antenna ports), the scrambling code indication (scrambling identity) and the number of layers indication (number of layers indication) in LTE, it may also include the DMRS port number, port index, sequence generation information , at least one of the CDM types, and on this basis, add the quantization value of the number of transmission layers. The DMRS configuration information table can be stored on the transmitter and the receiver at the same time, and the transmitter sends the indication information to the receiver. It should be understood that the transmitter sends the original DCI signaling in LTE to the receiver (due to the use of LTE's original DCI signaling). Signaling, the DCI signaling may not be named as indication information, but it can indicate the rate matching scheme), the receiving end obtains its own port information and the total number of quantized transmission layers of the system through this signaling, and combines the two information , calculate the ports used by other receivers. That is, the receiving end identifies which resource units are used for the DMRS transmission of the receiving end, which resource units are used for the DMRS transmission of other receiving ends of CDM multiplexing, and the remaining resource units are used for the receiving end. Therefore, the receiving end performs data demodulation on the corresponding resource unit.

In the explicit signaling indication scheme, the above-mentioned correspondence between the indication information and the quantized value of the number of orthogonal transmission layers exists independently of the DMRS configuration information table in LTE, that is, the difference between the indication information and the quantized value of the number of transmission layers exists. The corresponding relationship between them is not implied in the DMRS configuration information table, so the transmitter and the receiver not only save the DMRS configuration information table, but also save the corresponding relationship configuration table of the quantization value of the indication information and the number of transmission layers (or The information table can be configured through RRC), the corresponding relationship configuration table exists independently of the DMRS configuration information table, the transmitting end sends the rate configuration indication information to the receiving end through explicit signaling, and the receiving end uses the indication information. As an index, look up the quantized value of the corresponding number of transmission layers in the corresponding relationship configuration table, and the receiving end combines the quantized value of the number of transmission layers with the DMRS configuration information table to identify which resource units are used by the local The DMRS of the receiver is occupied, which resource units are occupied by the DMRS of other receivers that are multiplexed by CDM, and the remaining resource units are used for data transmission related to the receiver. Data demodulation.

It should be noted that the indication information of the same value may correspond to quantized values of different numbers of transmission layers, so the correspondence between the indication information and the quantized values of the number of transmission layers may also be indicated by separate signaling.

It should be understood that, for the explicit indication scheme, the number of quantized transmission layers is indicated by the indication information, and the receiving end will receive two signalings, one is the DMRS DCI signaling in LTE, and the other is used to transmit the current quantization. Indication information of the number of transmission layers (also referred to as rate matching signaling herein).

It can be understood that, in either the implicit indication or the explicit indication scheme, when the above-mentioned DMRS indication information is sent to the receiving end, it can be sent in the form of independent signaling, or it can be carried in downlink signaling and sent. For example, it is sent in the downlink control information DCI, which is not limited here.

In an implementation manner, whether to send the DMRS indication information is determined by the number of codewords (codewords). For example, if one codeword triggers signaling to send DMRS indication information, and two codewords do not send the signaling, the reason is that there are SU and MU scenarios for one codeword, but two codewords must be SU scenarios. In a SU-MIMO (single user multiple-input multiple-output, SU-MIMO) scenario corresponding to two codewords, the transmitter, such as the base station, communicates with only one receiver (terminal), and only the terminal's data is transmitted in the time-frequency resources. Information (RS, control signaling, data, etc.). At this time, the terminal can directly know the RE positions of its own DMRS according to its own information (such as its own port, number of layers, etc.), and avoid these REs during data decoding. Therefore, there is no rate matching problem of DMRS in SU.

A second aspect of the embodiments of the present application further provides a DMRS rate matching indication and receiving method, which includes:

Using 2 TRPs of the non-QCL group in the 2PDCCH scenario, each TRP mutes the resource unit corresponding to the DMRS of the QCL group that it does not use for data transmission, and one TRP can have one or more DMRS of the QCL group; this This behavior can be the default action;

In a 1PDCCH scenario, the transmitter needs to send DMRS indication information to the receiver, where the DMRS indication information indicates resource elements corresponding to DMRSs in one or more QCL groups used by the transmitter.

In the 2PDCCH scenario or the 1PDCCH scenario, there are two ways for the transmitter to notify the receiver:

First, the transmitter sends DMRS indication information to the receiver. In the 2PDCCH scenario, the DMRS indication information indicates the current quantized number of transmission layers in the available DMRS ports of the TRP, or in the 1PDCCH scenario, the current system cooperates The total number of layers that TRP can use.

Second, in the 2PDCCH scenario, for different DMRS patterns, the receiving end can use the DMRS configuration information table corresponding to the DMRS pattern that contains the DMRS indication information to perform rate matching. It should be noted that the DMRS pattern here refers to the The DMRS pattern formed by the DMRS ports in the QCL group that can be used by the TRP. Or in a 1PDCCH scenario, a DMRS pattern formed by multiple QCL groups of DMRS ports that can be used by the coordinated TRP.

It should be noted that, the multiple DMRS configuration information tables can also be an information summary table, the information summary table supports the maximum number of ports, and the multiple DMRS configuration information tables are subsets of the information summary table, from The selected subsets in the general information table may be selected according to the maximum number of supported ports or the DMRS pattern or high-layer signaling.

In the implementation manner that the DMRS indication information indicates the DMRS antenna port set information, the DMRS antenna port set information refers to the status of the occupied DMRS antenna port group according to the actual number of DMRS layers scheduled by the current system, For example, port group 1 is {1, 2, 3, 4}, and port group 2 is {5, 6, 7, 8}. Assuming that the base station schedules the DMRS port numbers in ascending order, when the number of scheduling layers is 4, Indicates that port group 1 is occupied. When it is greater than 4 layers, it indicates that port groups 1 and 2 are occupied. Only an example is given here, and specific port number grouping and base station scheduling are not limited.

In an implementation manner in which the DMRS indication information indicates the code division multiplexing CDM group information of the DMRS antenna port, the code division multiplexing CDM group information includes the CDM port group of the DMRS antenna port not used by the receiving end itself information, or the sum of the DMRS antenna port group information used by the receiving end itself and the DMRS antenna port group information not used by the receiving end itself.

The DMRS CDM port group information not used by itself may include at least one of the following states:

1. All DMRS RE locations can transmit data (SU);

2. All DMRS RE positions are occupied (MU). This situation includes that the receiver uses 1 (or 2) DMRS port CDM groups, and the other 2 (or 1) are occupied, or the receiver uses 2 DMRS ports CDM group, and the other 1 is occupied.

3. The larger one of the two port groups of the non-receiving end of the Mute (MU, UE uses one port group);

4. The smaller one of the two port groups of the non-receiving end of the Mute (MU and UE use one port group);

It should be understood that "larger, smaller": can be defined as the comparison between the largest or smallest port numbers in the 2 CDM port groups (that is, using the relative relationship of non-UE's own DMRS port groups)

In specific implementation, for states 3 and 4, there may not be a "larger, smaller" comparison process, for example, it may be the port number included in the port group, or the number of the port group.

The DMRS CDM port group information not used by itself can be bound with the DMRS type (DMRS configuration/Type 1/A or 2/B), or with the number of CDM groups included in the pattern (2 or 3).

This way of indicating the state of the DMRS port group used by the non-receiving end can further reduce the instruction overhead, and this way can also support multiple scenarios, and has good versatility. For example, it can directly support 1PDCCH NC-JT, dynamic TDD; 2PDCCH NC-JT, with less changes to existing instructions.

On the other hand, an embodiment of the present application provides a transmitter, and the transmitter includes:

The processor, the transmitting end determines the DMRS configuration information corresponding to the current DMRS transmission scheme from the multiple groups of demodulation reference signal DMRS configuration information, and obtains the DMRS indication information according to the DMRS configuration information; each group of DMRS configuration information includes multiple DMRS configurations information; a transceiver to send the DMRS indication information.

On the other hand, an embodiment of the present application provides a transmitter, including:

a processor that generates demodulation reference signal DMRS indication information; the DMRS indication information corresponds to the maximum number of supported ports or a DMRS pattern, or a DMRS configuration type;

A transceiver, for sending the DMRS indication information.

On the other hand, the present application provides a receiving end, including:

The transceiver receives the demodulation reference signal DMRS indication information sent by the transmitter; the DMRS indication information is obtained by the transmitter according to the DMRS configuration information, and the DMRS configuration information is obtained by the transmitter according to the current DMRS transmission scheme from multiple groups of demodulation reference information Determined in the signal DMRS configuration information; each group of DMRS configuration information includes multiple pieces of DMRS configuration information;

The processor obtains DMRS configuration information and assists in demodulating data according to the DMRS indication information received by the transceiver.

In another aspect, the present application provides another transmitter, including:

a processor that generates demodulation reference signal DMRS indication information; the DMRS indication information is used to indicate resources that are not occupied by the DMRS in the resources that can be used to bear the DMRS;

A transceiver, for sending the DMRS indication information.

On the other hand, the present application provides another receiving end, including:

a transceiver, configured to receive demodulation reference signal DMRS indication information; the DMRS indication information is used to indicate resources that are not occupied by DMRS in the resources that can be used to bear the DMRS;

The processor is configured to perform data demodulation on resources not occupied by the DMRS according to the DMRS indication information.

When applied to an uplink transmission scenario, the above apparatus may be a terminal; when applied to a downlink transmission scenario, the apparatus may be a network device, and the network side device may be a base station or a control node.

Such network-side devices may include systems and devices that are improvements to peer-to-peer devices in conventional wireless telecommunication systems. Such advanced or next generation equipment may be included in evolving wireless communication standards such as Long Term Evolution (LTE).

On the other hand, an embodiment of the present application provides a base station, and the base station has a function of implementing the actual base station behavior in the foregoing method. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the base station includes a processor and a transceiver, and the processor is configured to support the base station to perform the corresponding functions in the above method. The transceiver is used for supporting communication between the base station and the terminal, sending information or signaling involved in the above method to the terminal, and receiving information or instructions sent by the base station. The base station may also include a memory coupled to the processor that holds program instructions and data necessary for the base station.

When applied to an uplink transmission scenario, the apparatus may be a network device; when applied to a downlink transmission scenario, the apparatus is a terminal, and the terminal has the function of implementing the terminal behavior in the above method design. The functions can be implemented by hardware, and the structure of the terminal includes a transceiver and a processor. The corresponding software implementation can also be executed by hardware. The hardware or software includes one or more modules corresponding to the above functions. The modules may be software and/or hardware.

In yet another aspect, an embodiment of the present application further provides a processing device, including a processor and an interface;

The processor is the processor in the aforementioned transmitter or receiver;

The processing device may be a chip, and the processor may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software, The processor may be a general-purpose processor, which is implemented by reading software codes stored in a memory, and the memory may be integrated in the processor, or be located outside the processor and exist independently.

In another aspect, an embodiment of the present application provides a communication system, where the system includes the base station and the terminal described in the foregoing aspects. Optionally, the control node in the above embodiment may also be included.

In another aspect, an embodiment of the present application provides a computer storage medium for storing computer software instructions used by the above-mentioned base station, which includes a program designed to execute the above-mentioned aspects.

In another aspect, an embodiment of the present application provides a computer storage medium for storing computer software instructions used by the above-mentioned terminal, including the program designed for executing the above-mentioned aspects.

Implementing the method and device for sending a demodulation reference signal provided by the present application, and the method and device for obtaining a demodulation reference signal, can meet the requirements of higher layer data transmission by matching multiple DMRS configuration information with various scenarios of NR, And the multiple information tables support handover, which can further reduce the indication overhead.

A first aspect of the embodiments of the present invention provides a data sending method, the method is used for sending multiple data streams to a receiving end device through multiple demodulation reference signal DMRS ports, wherein the multiple DMRS ports belong to At least two port groups, each DMRS port in each port group satisfies a quasi-co-located QCL relationship, and any DMRS port in each port group and any DMRS port in any other port group satisfies non-quasi-co-location. address Non-QCL relationship; the multiple DMRS ports are assigned to at least two transmitter devices, and the DMRS ports assigned to each transmitter device belong to the same port group, and the method includes:

In a possible design, each transmitter device maps a codeword to a data stream corresponding to the DMRS port allocated by the transmitter device;

Each transmitter device sends a data stream corresponding to the DMRS port allocated by the transmitter device to the receiver device.

In a possible design, the at least two transmitter devices are at least two antenna panels of the same transmitter device,

Each transmitting-end device maps a codeword to the data stream corresponding to the DMRS port allocated by the transmitting-end device. Specifically, for each antenna panel, the same transmitting-end device maps a codeword to the antenna panel allocated to the data stream. The data stream corresponding to the DMRS port;

Each transmitting end device sends the data stream corresponding to the DMRS port allocated by the transmitting end device to the receiving end device. Specifically, each antenna panel sends the data stream corresponding to the DMRS port allocated by the antenna panel to the receiving end device. receiver device.

In a possible design, before each transmitting end device maps a codeword to a data stream corresponding to the DMRS port allocated by the transmitting end device, the method further includes: the at least two transmitting ends A transmitter device in the devices sends indication information to the receiver device, where the indication information is used to indicate the plurality of DMRS ports allocated to the receiver device.

In a possible design, before each transmitting-end device maps a codeword to a data stream corresponding to the DMRS port allocated by the transmitting-end device, the method further includes: the same transmitting-end device sends a The receiving end device sends indication information, where the indication information is used to indicate the plurality of DMRS ports allocated to the receiving end device.

In various aspects and various possible designs of the embodiments of the present invention, the number of the multiple data streams (that is, the number of the multiple DMRS ports) is less than or equal to 4, but may not be limited thereto. For example, the technical solutions provided in the embodiments of the present invention can be applied to a scenario where the number of data streams is less than or equal to 4, but not to a scenario where the number of data streams is greater than 4. Furthermore, in a scenario where the number of data streams is less than or equal to 4, the technical solutions provided by the embodiments of the present invention can be applied to scenarios where the number of data streams is 3 and/or 4 (that is, the number of the multiple data streams is is 3 and/or 4), and does not apply to the scenario where the number of the plurality of data streams is 2. Of course, the technical solutions provided by the embodiments of the present invention may not be limited by the above scenarios.

According to a second aspect of the embodiments of the present invention, a data receiving method is provided, including:

Receive multiple data streams through multiple DMRS ports, wherein the multiple DMRS ports belong to at least two port groups, and each DMRS port in each port group satisfies a quasi-co-located QCL relationship. Any DMRS port and any DMRS port in any other port group satisfy the non-quasi-co-located Non-QCL relationship;

For each port group in the at least two port groups, the receiving end device recovers a codeword according to the data stream corresponding to the DMRS port in the port group among the multiple DMRS ports.

In a possible design, before receiving the plurality of data streams, the method further includes:

An indication information is received, where the indication information is used to indicate the multiple DMRS ports.

In a possible design, the number of the multiple data streams (that is, the number of the multiple DMRS ports) is less than or equal to 4, but it may not be limited thereto. For example, the technical solutions provided in the embodiments of the present invention can be applied to a scenario where the number of data streams is less than or equal to 4, but not to a scenario where the number of data streams is greater than 4. Furthermore, in a scenario where the number of data streams is less than or equal to 4, the technical solutions provided by the embodiments of the present invention can be applied to scenarios where the number of data streams is 3 and/or 4 (that is, the number of the multiple data streams is is 3 and/or 4), and does not apply to the scenario where the number of the plurality of data streams is 2. Of course, the technical solutions provided by the embodiments of the present invention may not be limited by the above scenarios.

According to a third aspect of the embodiments of the present invention, a data receiving method is provided, including:

Receive multiple data streams through multiple DMRS ports, wherein the multiple DMRS ports belong to the same port group, and each DMRS port in the port group satisfies a quasi-co-located QCL relationship;

From the plurality of data streams, a codeword is recovered.

In a possible design, before receiving the plurality of data streams, the method further includes:

An indication information is received, where the indication information is used to indicate the multiple DMRS ports.

In a possible design, the number of the plurality of data streams is less than or equal to four.

In the above aspects and various possible designs, the indication information is downlink control information DCI.

The above data flow is also called the data layer.

According to a fourth aspect of the embodiments of the present invention, a transmitter device is provided, and the transmitter device is configured to, together with at least one other transmitter device, send a plurality of data to a receiver device through a plurality of demodulation reference signal DMRS ports. flow, wherein the multiple DMRS ports belong to at least two port groups, each DMRS port in each port group satisfies a quasi-co-located QCL relationship, and any DMRS port in each port group and any other port Any DMRS port in the group satisfies a non-quasi-co-located Non-QCL relationship; the multiple DMRS ports are allocated to the transmitting end device and the at least one other transmitting end device, the transmitting end device and the at least one The DMRS port allocated to each transmitting end device in one other transmitting end device belongs to the same port group, and the transmitting end device includes:

a mapping module for mapping a codeword to a data stream corresponding to the DMRS port allocated by the transmitting end device;

The transmitting module is configured to send the data stream corresponding to the DMRS port allocated by the transmitting end device to the receiving end device.

In a possible design, the transmitter device and the at least one other transmitter device are at least two antenna panels of the same transmitter device,

The mapping module is arranged in the same transmitter device, and the mapping module is specifically configured to, for each antenna panel, map a codeword to a data stream corresponding to the DMRS port allocated by the antenna panel;

The transmitting module is arranged in the same transmitting end device, and the transmitting module is specifically used for each antenna panel to send the data stream corresponding to the DMRS port allocated by the antenna panel to the receiving end device.

In a possible design, the transmitting module is further configured to send indication information to the receiving end device, where the indication information is used to indicate the multiple DMRS ports allocated to the receiving end device.

In a possible design, the number of the plurality of data streams is less than or equal to four.

According to a fifth aspect of the embodiments of the present invention, a receiving end device is provided, including:

a receiving module, configured to receive multiple data streams through multiple DMRS ports, wherein the multiple DMRS ports belong to at least two port groups, and each DMRS port in each port group satisfies a quasi-co-located QCL relationship, Any DMRS port in each port group and any DMRS port in any other port group satisfy a non-quasi-co-located Non-QCL relationship;

The recovery module is configured to, for each of the at least two port groups, recover a codeword according to the data stream corresponding to the DMRS port in the port group among the multiple DMRS ports.

In a possible design, the receiving module is further configured to receive indication information, where the indication information is used to indicate the multiple DMRS ports.

In a possible design, the number of the plurality of data streams is less than or equal to four.

According to a sixth aspect of the embodiments of the present invention, a receiving end device is provided, including:

A receiving module, configured to receive multiple data streams through multiple DMRS ports, wherein the multiple DMRS ports belong to the same port group, and each DMRS port in the port group satisfies a quasi-co-located QCL relationship;

A recovery module, configured to recover a codeword according to the multiple data streams.

In a possible design, the receiving module is further configured to receive indication information, where the indication information is used to indicate the multiple DMRS ports.

In a possible design, the number of the plurality of data streams is less than or equal to four.

In various aspects and various designs of the embodiments of the present invention, the foregoing indication information may be downlink control information DCI.

According to a seventh aspect of the embodiments of the present invention, a data sending method is provided, the method is used for sending multiple data streams to a receiving end device through multiple demodulation reference signal DMRS ports, wherein the multiple DMRS ports are divided into It belongs to at least two port groups, and each DMRS port in each port group satisfies the quasi-co-located QCL relationship, and any DMRS port in each port group and any DMRS port in any other port group satisfies the non-quasi-quasi-co-located QCL relationship. Co-located Non-QCL relationship; the multiple DMRS ports are assigned to the same transmitter device, and for each port group, the method includes:

The transmitting end device maps a codeword to a data stream corresponding to the DMRS port in the port group among the multiple DMRS ports;

The transmitting end device sends the data stream to the receiving end device.

In a possible design, the method further includes: the transmitting-end device sends indication information to the receiving-end device, where the indication information is used to indicate the multiple DMRSs allocated to the receiving-end device port.

In a possible design, the number of the plurality of data streams is less than or equal to four.

According to an eighth aspect of the embodiments of the present invention, a transmitter device is provided, the transmitter device is configured to send multiple data streams to a receiver device through multiple demodulation reference signal DMRS ports, wherein the multiple DMRS The ports belong to at least two port groups, each DMRS port in each port group satisfies a quasi-co-located QCL relationship, and any DMRS port in each port group and any DMRS port in any other port group satisfy Non-quasi-co-located Non-QCL relationship; the multiple DMRS ports are allocated to the transmitter device, and the transmitter device includes:

a mapping module for, for each port group, mapping a codeword to a data stream corresponding to the DMRS port in the port group among the multiple DMRS ports;

A transmitting module, configured to send the data stream to the receiving end device.

In a possible design, the method further includes that the transmitting module is further configured to send indication information to the receiving end device, where the indication information is used to indicate the multiple allocations for the receiving end device. DMRS ports.

In a possible design, the number of the plurality of data streams is less than or equal to four.

In general, an embodiment of the present invention provides a data sending method, which is used for sending multiple data streams to a receiving end device through multiple demodulation reference signal DMRS ports, wherein the multiple DMRS ports belong to At least two port groups, each DMRS port in each port group satisfies a quasi-co-located QCL relationship, and any DMRS port in each port group and any DMRS port in any other port group satisfies non-quasi-co-location. address Non-QCL relationship, for each port group, the method includes:

A codeword is mapped to a data stream corresponding to the DMRS port in the port group among the multiple DMRS ports;

Send the data stream to the receiving end device.

In a possible design, the method further includes sending indication information to the receiving end device, where the indication information is used to indicate the multiple DMRS ports allocated to the receiving end device.

In a possible design, the number of the plurality of data streams is less than or equal to four.

In a possible design, the above-mentioned multiple DMRS ports can be assigned to the same transmitter device; it can also be assigned to multiple antenna panels of the same transmitter device, wherein the DMRS ports assigned to each antenna panel belong to the same port group; It can also be allocated to multiple transmitter devices serving the same receiver device (for example, based on CoMP (Coordinated Multi-Point, coordinated multi-point) related technology), and the DMRS port allocated to each transmitter device belongs to the same port group. In addition, the above-mentioned DMRS ports may also be allocated to one or more transmitting end devices in other ways, such as but not limited to various feasible combinations of the above-mentioned ways.

Correspondingly, an embodiment of the present invention also provides a data receiving method, including:

Receive multiple data streams through multiple DMRS ports, wherein the multiple DMRS ports belong to the same port group, or belong to at least two port groups, and each DMRS port in each port group satisfies a quasi-co-located QCL relationship , any DMRS port in each port group and any DMRS port in any other port group satisfy the non-quasi-co-located Non-QCL relationship;

For the same port group or each port group in the at least two port groups, the receiving end device recovers a codeword according to the data stream corresponding to the DMRS port in the port group among the multiple DMRS ports.

In a possible design, before receiving the plurality of data streams, the method further includes:

An indication information is received, where the indication information is used to indicate the multiple DMRS ports.

The number of the plurality of data streams is less than or equal to four.

It is not difficult to understand that on the receiving end device side, the receiving end device does not need to pay attention to whether the above-mentioned multiple DMRS ports come from one transmitting end device, multiple antenna panels of one transmitting end device, or multiple transmitting end devices.

QCL (Quasi-Co-Location) is usually used to describe similar large-scale fading, and similar spatial directions (such as but not limited to beam directions), etc., so non-quasi-co-location (Non-Quasi-Co-Location) , Non-QCL) are often used to describe different large-scale fading, as well as different spatial directions, etc. The related contents of QCL and Non-QCL have been clearly described in the prior art, so they will not be repeated here.

In actual transmission, information bits (bits) are usually divided in the form of transport blocks (Transport Block, TB), and a transport block can be a codeword (codeword, CW). For the content of TB and CW, please refer to current technology

Generally, the DMRS ports supported by the system can be divided into multiple port groups, each DMRS port in each port group satisfies the QCL relationship, and any DMRS port in each port group is connected to any other port group. A DMRS port satisfies the Non-QCL relationship. When multiple transmitter devices serve the same receiver device, the DMRS ports allocated to each transmitter device are from the same port group. For example, DMRS ports 0-9 may be divided into two port groups, namely port group 1 and port group 2, wherein DMRS ports 0-4 belong to port group 1, and DMRS ports 5-9 belong to port group 2. When allocating DMRS ports to the transmitting end device, any number of DMRS ports in port group 1 can be assigned to the transmitting end device, and any number of DMRS ports in port group 2 can also be assigned to the transmitting end device. In addition, whether multiple transmitter devices serve the same receiver device or a single transmitter device serves the receiver device, the DMRS ports allocated to the same transmitter device can be from the same port group or from different port group. For example, when it comes from the same port group, the port 1 and port 2 in the above port group 1 can be assigned to the transmitting end device; when it comes from different port groups, the ports 2 to 3 in the above port group 1 can be assigned and ports 8 to 9 in the above port group 2 are allocated to the transmitting end device. It is not difficult to understand that when the DMRS ports allocated to the same transmitter device are from different port groups, the wireless transmission performed by the transmitter device through the DMRS ports in different port groups will have Non-QCL characteristics, such as different large scales. Fading, or pointing in a different spatial direction. When the DMRS ports allocated to the same transmitter device are from the same port group, the wireless transmission performed by the transmitter device through the DMRS ports in the same port group will have QCL characteristics, such as similar large-scale fading, or point-to-point similar spatial orientation.

The above-mentioned related content of dividing the DMRS port into multiple port groups can refer to the prior art. For example, before the transmitter device and the receiver device leave the factory, they can be set in these devices in advance, or the DMRS port can be set by the transmitter device. The grouping situation is notified to the receiving end device in advance, such as but not limited to the transmitting end device through an RRC (RadioResource Control, Radio Resource Control) message, such as but not limited to the receiving end device accessing the communication network, or periodically, notifying the receiving end device. . In the case where the DMRS ports are divided into multiple port groups, the DMRS ports can be allocated to the transmitting end device according to the grouping situation and specific needs (for example, various application scenarios, such as CoMP).

The multiple transmitting end devices may be multiple transmitting end devices, or may be multiple antenna panels of a same transmitting end device. The above-mentioned transmitting end device may be, for example, but not limited to, a base station. The above-mentioned receiving end device may be, for example, but not limited to, a terminal.

For the process of mapping the codeword to the data stream, and the process of recovering the codeword from the data stream, reference may be made to the prior art.

When multiple transmitter devices serve one receiver device at the same time, the above-mentioned indication information may be sent by one of the multiple transmitter devices. In this case, the transmitter device that sends the above-mentioned indication information may be called For serving devices, other transmitter devices may be referred to as cooperating devices.

The above-mentioned data stream may also be called a data layer, which can usually be obtained by performing layer mapping on a codeword, and the specific process may refer to the prior art.

The steps in the above method may be performed by one or more processors, and some may be performed by executing a program by one or more processors.

The functions of each module in the above-mentioned transmitting-end device and receiving-end device may be integrated on one or more processors for execution, or may be executed by one or more processors executing programs.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the drawings required in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of a pilot pattern provided by the prior art;

FIG. 2 is a schematic diagram of a resource unit provided by an embodiment of the present application;

3 is a schematic diagram of a system architecture to which the technical solution provided by the embodiment of the present application is applied;

FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;

FIG. 6 is an interactive schematic diagram of a DMRS indication and receiving method provided by an embodiment of the present application;

7 is a schematic diagram of a DMRPattern provided by an embodiment of the present application;

8 is a schematic diagram of another DMRS pattern provided by an embodiment of the present application;

9 is a schematic diagram of another DMRS pattern provided by an embodiment of the present application;

10 is a schematic diagram of another DMRS pattern provided by an embodiment of the present application;

11 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

12 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

13 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

14 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

15 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

16 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

17 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

18 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

19 is a schematic diagram of another DMRPattern provided by an embodiment of the present application;

20 is a schematic diagram of a MU-MIMO scenario in an LTE system;

21 is a schematic diagram of another interaction flow of a DMRS indication method and a receiving method provided by an embodiment of the present application;

22 is a schematic diagram of a scenario of a DMRS indication method and a receiving method provided by an embodiment of the present application;

FIG. 23 is a schematic diagram of the corresponding indication information and pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application;

24 is a schematic diagram of another scenario of a DMRS indication method and a receiving method provided by an embodiment of the present application;

FIG. 25 is another schematic diagram of indicating information corresponding to a pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application.

26 is a schematic diagram of another scenario of a DMRS indication method and a receiving method provided by an embodiment of the present application;

FIG. 27 is another schematic diagram of indicating information corresponding to a pattern in a DMRS indicating method and receiving method provided by an embodiment of the present application.

28 is a schematic diagram of another scenario of a DMRS indication method and a receiving method provided by an embodiment of the present application;

FIG. 29 is another schematic diagram of indicating information corresponding to a pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application.

FIG. 30 is another schematic diagram of indicating information corresponding to a pattern in a DMRS indicating method and receiving method provided by an embodiment of the present application.

FIG. 31 is another schematic diagram of indicating information corresponding to a pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application.

FIG. 32 is another schematic diagram of indicating information corresponding to a pattern in a DMRS indication method and a receiving method according to an embodiment of the present application.

FIG. 33 is another schematic diagram of indicating information corresponding to a pattern in a DMRS indicating method and receiving method provided by an embodiment of the present application.

FIG. 34 is another schematic diagram of indicating information corresponding to a pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application.

35 is a schematic diagram of another application scenario in a DMRS indication method and a receiving method provided by an embodiment of the present application;

FIG. 36 is another schematic diagram of the corresponding indication information and pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application;

Figure 37 is another schematic diagram of the corresponding indication information and pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application;

FIG. 38 is a schematic diagram of a scenario of a DMRS indication method and a receiving method provided by an embodiment of the present application.

Figure 39 is another schematic diagram of the corresponding indication information and pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application;

FIG. 40 is another schematic diagram of the corresponding indication information and pattern in a DMRS indication method and a receiving method provided by an embodiment of the present application;

41 is a schematic diagram of a module of a transmitter according to an embodiment of the present application;

42 is a schematic diagram of a module of a receiving end provided by an embodiment of the present application;

FIG. 43 is a schematic diagram of a transmitter or a receiver provided by an embodiment of the present application.

Detailed ways

First of all, a brief introduction to the relevant terms involved in this article is made for the convenience of readers:

1), resource unit (resource unit)

Similar to RB and RB pair in the LTE standard, some embodiments of the present application provide a resource unit, which can be used as a basic unit for scheduling terminals to allocate resources, and can also be used to describe multiple arrangement of reference signals.

A resource unit may be composed of multiple consecutive subcarriers in the frequency domain and a time interval (time interval, TI) in the time domain. In different scheduling processes, the size of the resource unit may be the same or different. The TI here may be a transmission time interval (TTI) in an LTE system, a symbol-level short TTI, or a short TTI with a large subcarrier interval in a high-frequency system, or a 5G system slot or mini-slot (mini-slot). This application does not limit this.

Optionally, one resource unit may include one or more RBs, one or more RB pairs, etc., and may also be half an RB or the like. In addition, other time-frequency resources may also be used, which is not limited in this application. One RB pair is composed of 12 consecutive subcarriers in the frequency domain and one subframe in the time domain. A time-frequency resource composed of a subcarrier in the frequency domain and a symbol in the time domain is a resource element (resource element, RE), as shown in FIG. 2 . The RB pair in FIG. 2 is composed of 12 consecutive subcarriers (numbered 0 to 11) in the frequency domain and 14 symbols (numbered 0 to 13) in the time domain. In Fig. 2, the abscissa represents the time domain, and the ordinate represents the frequency domain. It should be noted that the drawings including time domain resources in this application are all described based on the RB pair shown in FIG. 2 as an example, and those skilled in the art can understand that the specific implementation is not limited to this. It can be understood that "symbols" in this application may include but are not limited to any of the following: orthogonal frequency division multiplexing (OFDM) symbols, universal filtered multi-carriers (UFMC) Signals, filter-bandmulti-carrier (FBMC) symbols, generalized frequency-division multiplexing (GFDM) symbols, etc.

2), DMRS port group

The "DMRS port group" involved in this application is a logical concept introduced to clearly describe the technical solutions provided in this application, and specifically, it is introduced to clearly describe the pilot pattern or its modification provided in this application. a logical concept. It can be understood that, in actual implementation, the base station and the terminal may not perform the action of grouping the DMRS ports, and design the pilot pattern as described in this application or its modification in any way, which shall fall within the protection scope of this application. .

A DMRS port group may include one or more DMRS ports. In this application, the same time-frequency resources are multiplexed between the DMRSs corresponding to each port in the DMRS port group through CDM, such as orthogonal covercode (OCC), cyclic shift (CS), or Methods such as cyclic phase rotations, or a combination of the above methods, such as OCC+CS. The technical solution of multiplexing time-frequency resources for multiple reference signals by means of CDM has been clearly described in the prior art, and details are not described herein again.

3) DMRS ports supported by the system

The DMRS port supported by the system can be considered as a DMRS port that can be used by the base station. In actual implementation, the base station may use some or all of the DMRS ports supported by the base station to schedule the terminal. The maximum number of orthogonal ports that can be supported, that is, the maximum number of DMRS orthogonal ports that the system or base station can support.

In this application, the number of DMRS ports supported by the system is 4, 6, 8, and 12 as an example for description.

4) Other terms

The term "plurality" as used herein refers to two or more.

The terms "first", "second", etc. herein are only used to distinguish different objects, and do not limit their order. For example, the first symbol group and the second symbol group are only for distinguishing different symbol groups, and the sequence of the symbols is not limited.

The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

The technical solutions provided by the present application will be introduced below with reference to the accompanying drawings.

The technical solutions provided in this application can be applied to various communication systems, such as current 2G, 3G, and 4G communication systems, and future evolution networks, such as 5G communication systems. For example, LTE systems, 3rd generation partnership project (3GPP) related cellular systems, etc., and other such communication systems. Especially, it can be applied in 5G NR system.

It should be noted that the 5G standard can include machine to machine (M2M), device to machine (D2M), macro-micro communication, enhanced mobile Internet (enhance mobile broadband, eMBB), ultra-high reliability and ultra-low latency communication (ultra reliable & low latency communication, uRLLC) and massive machine type communication (mMTC) and other scenarios, these scenarios can include but are not limited to: terminal-to-terminal communication scenarios, base stations and base stations Communication scenarios between base stations and terminals, etc. The technical solutions provided in the embodiments of the present application can also be applied to scenarios such as communication between terminals in a 5G communication system, or communication between base stations and base stations.

The technical solutions provided in the embodiments of the present application may be applied to the system architecture shown in FIG. 3 , where the system architecture may include a base station 100 and one or more terminals 200 connected to the base station 100 .

In one example, the base station 100 may be implemented by the structure shown in FIG. 4 .

The base station 100 may be a device capable of communicating with the terminal 200 . The base station 100 may be a relay station or an access point or the like. The base station 100 may be a base transceiver station (BTS) in a global system for mobile communication (GSM) or a code division multiple access (CDMA) network, or a broadband code division An NB (NodeB) in multiple access (wideband code division multiple access, WCDMA) may also be an eNB or an eNodeB (evolutional NodeB) in LTE. The base station 100 may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario. The base station 100 may also be a network device in a future 5G network or a network device in a future evolved PLMN network; it may also be a wearable device or a vehicle-mounted device, or the like.

Terminal 200 may be user equipment (UE), access terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal, mobile device, UE terminal, terminal, wireless communication device, UE proxy or UE devices, etc. The access terminal may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a wireless communication capability handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminals in future 5G networks or terminals in future evolved PLMN networks, etc.

The general hardware architecture of the base station 100 is described. As shown in FIG. 4 , the base station may include an indoor baseband unit (building baseband unit, BBU) and a remote radio unit (remote radio unit, RRU). The RRU is connected to the antenna feeder system (ie, the antenna), and the BBU and RRU can be used as required. Take apart to use. It should be noted that, in the specific implementation process, the base station 100 may also adopt other general hardware architectures, and is not limited to the general hardware architecture shown in FIG. 4 .

Taking the terminal 200 as a mobile phone as an example, the general hardware architecture of the mobile phone will be described. As shown in FIG. 5, the mobile phone may include: a radio frequency (RF) circuit 110, a memory 120, other input devices 130, a display screen 140, a sensor 150, an audio circuit 160, an I/O subsystem 170, a processor 180, And components such as power supply 190 . Those skilled in the art can understand that the structure of the mobile phone shown in FIG. 5 does not constitute a limitation on the mobile phone, and may include more or less components than the one shown in the figure, or combine some components, or disassemble some components, or Different component arrangements. Those skilled in the art can understand that the display screen 140 belongs to a user interface (user interface, UI), and the display screen 140 may include a display panel 141 and a touch panel 142 . And the cell phone may include more or less components than shown. Although not shown, the mobile phone may further include functional modules or devices such as a camera and a Bluetooth module, which will not be repeated here.

Further, the processor 180 is connected to the RF circuit 110, the memory 120, the audio circuit 160, the I/O subsystem 170, and the power supply 190, respectively. The I/O subsystem 170 is respectively connected with other input devices 130 , the display screen 140 and the sensor 150 . Wherein, the RF circuit 110 can be used for receiving and transmitting signals during sending and receiving of information or during a call, in particular, after receiving the downlink information of the base station, it is processed by the processor 180 . Memory 120 may be used to store software programs and modules. The processor 180 executes various functional applications and data processing of the mobile phone by running the software programs and modules stored in the memory 120 . Other input devices 130 may be used to receive input numerical or character information, and to generate key signal input related to user settings and function control of the mobile phone. The display screen 140 may be used to display information input by or provided to the user and various menus of the mobile phone, and may also accept user input. Sensor 150 may be a light sensor, motion sensor, or other sensor. Audio circuit 160 may provide an audio interface between the user and the cell phone. The I/O subsystem 170 is used to control input and output external devices, and the external devices may include input controllers of other devices, sensor controllers, and display controllers. The processor 180 is the control center of the mobile phone 200, using various interfaces and lines to connect various parts of the entire mobile phone, by running or executing the software programs and/or modules stored in the memory 120, and calling the data stored in the memory 120, Execute various functions of the mobile phone 200 and process data, so as to monitor the mobile phone as a whole. The power supply 190 (such as a battery) is used to supply power to the above components. Preferably, the power supply can be logically connected to the processor 180 through a power management system, so as to manage charging, discharging, and power consumption through the power management system.

The technical solutions provided in this application can be used in single-carrier transmission scenarios, multi-carrier transmission scenarios, and multiple waveform hybrid transmission scenarios; can be applied in uplink transmission scenarios, and can also be applied in downlink transmission scenarios In a scenario, or a scenario where uplink and downlink are transmitted at the same time.

The method for transmitting DMRS provided by the present application will be described below, where the method for transmitting DMRS may include a method for transmitting DMRS at the transmitting end, and a method for acquiring DMRS at the receiving end.

As shown in FIG. 6 , a method for transmitting DMRS provided by the present application. The method can include:

S101: The transmitter determines DMRS configuration information corresponding to the current DMRS transmission scheme from multiple sets of demodulation reference signal DMRS configuration information, and obtains DMRS indication information according to the DMRS configuration information; each group of DMRS configuration information includes multiple pieces of DMRS configuration information .

The multiple DMRS configuration information may be presented in the form of a DMRS configuration information table, one way is to present it in the form of multiple independent tables, or it may be a subset belonging to a general information table.

S102: The transmitting end sends DMRS indication information through time-frequency resources.

S103: The receiving end receives the DMRS indication information.

S104: The receiving end performs channel estimation or auxiliary demodulation data according to the received DMRS indication information.

Wherein, the time-frequency resource used to carry the DMRS may include one or more symbols in the time domain, and may include one or more subcarriers in the frequency domain.

If the technical solution is applied in an uplink transmission scenario, the transmitting end may be a terminal, and the receiving end may be a base station. If the technical solution is applied in a downlink transmission scenario, the transmitting end may be a base station, and the receiving end may be a terminal.

In the embodiment of the present application, the current DMRS transmission scheme is indicated by indication information; different DMRS transmission schemes correspond to different maximum numbers of orthogonal ports that can be supported, or different corresponding DMRS patterns or corresponding DMRS configuration types.

The maximum number of orthogonal ports that can be supported in the DMRS configuration information corresponding to the different DMRS transmission schemes is different.

The lengths of the DMRS indication information corresponding to the different DMRS transmission schemes are different.

The multiple DMRS ports in the at least one piece of DMRS configuration information belong to different code division multiple access CDM groups, wherein different CDM groups satisfy a non-quasi-co-located QCL relationship.

Different DMRS configuration information can be configured for different maximum number of orthogonal ports that can be supported. For example, for the maximum number of orthogonal ports that can be supported is 4, the number of orthogonal ports is 6, the number of orthogonal ports is 8, the number of orthogonal ports For 12 MIMO scenarios, configure the corresponding DMRS configuration information respectively, the DMRS configuration information is to let the receiving end know the DMRS orthogonal port number, sequence configuration, multiplexing mode, etc. that it can use, so as to perform correct data decoding.

In another implementation manner, the DMRS configuration information is configured for different DMRS patterns. Generally speaking, one DMRS pattern corresponds to a type that supports the maximum number of supportable orthogonal ports or the maximum number of supportable orthogonal transmission layers. In the MIMO scenario, the DMRS pattern indicates how many orthogonal orthogonal port groups it supports, and how many resource units each orthogonal port group consists of. The receiving end knows the DMRS orthogonal port number, sequence configuration, multiplexing mode, etc. that it can use, so as to perform correct data decoding.

In an implementation manner of the first aspect, the DMRS configuration information may be presented by a protocol agreement table, and its specific implementation form may be a downlink control information (downlink control information, DCI) table (table), and multiple DCI tables at least Contains a different DMRS configuration information; the DMRS transmission scheme corresponding to the DMRS configuration information is sent through high-level signaling such as radio resource control (radio resource control, RRC) signaling, and of course other configuration parameters corresponding to the scene can also be used. Binding, such as frequency, carrier spacing, frame structure, etc. The DMRS indication information can be sent through DCI signaling or a media access control control element (media access control control element, MACCE).

In a specific implementation, each DMRS configuration information table corresponds to a different maximum number of orthogonal ports that can be supported. For example, the maximum number of orthogonal ports that can be supported can be at least two of {4, 6, 8, and 12}. ;

In another implementation manner, each DMRS configuration information table may correspond to a different DMRS pattern (pattern) or DMRS configuration type (configuration type).

In an implementation manner, the information table is designed according to the orthogonal port combination, for example, the orthogonal port combination of less than or equal to four transmission layers is divided into the orthogonal port combination of more than four transmission layers. column design;

In an implementation manner, when the DMRS configuration information is presented in the form of a DMRS configuration information table, it may be divided according to the number of codewords (codeword number), or may not be divided according to the number of codewords, but according to the total The maximum number of orthogonal ports that can be supported can be divided according to the number of transmission layers at the receiving end. Specifically, it can be divided according to a certain proportion.

The DMRS configuration information also includes indication information of the total number of orthogonal ports, and the indication information may indicate the number of all orthogonal ports that may actually appear, or the quantized value of the number of all orthogonal ports that may actually appear. The quantized value of the number of all orthogonal ports may be DMRS orthogonal layer number information, or DMRS antenna orthogonal port set indication information, or CDM group information of DMRS antenna orthogonal ports, or information generated according to the CDM size. It should be understood that the total number of orthogonal ports is the same as the total number of orthogonal DMRS transmission layers.

The reason why the quantization value of the number of DMRS orthogonal transmission layers is used is because if you want to indicate the specific number of orthogonal transmission layers at the receiving end, such as indicating the number of orthogonal transmission layers {1, 2, 3, 4}, 4 bits are required to Indicate, and quantize the number of orthogonal transmission layers {1, 2, 3, 4} to a value, for example, quantize up to the number of orthogonal transmission layers of 4, or down quantize to the number of orthogonal transmission layers of 1, or use 2 Or 3 to indicate the number of reorganized orthogonal transmission layers {1, 2, 3, 4,}, then the quantization value indicating the number of orthogonal transmission layers only needs one bit to indicate, for example, use 0 to indicate the quantization of the number of orthogonal transmission layers The value is 4, so the indication overhead can be reduced.

It should be noted that, the multiple DMRS configuration information tables may be an information summary table, the information summary table supports the maximum number of orthogonal ports that can be supported, and the multiple DMRS configuration information tables are sub-sections of the information summary table. Sets, and selecting subsets from the general information table can be selected according to the maximum number of orthogonal ports that can be supported, DMRS patterns, or high-layer signaling.

It should be noted that, the multiple DMRS configuration information tables may be an information summary table, the information summary table supports the maximum number of orthogonal ports that can be supported, and the multiple DMRS configuration information tables are sub-sections of the information summary table. Sets, and selecting subsets from the general information table can be selected according to the maximum number of orthogonal ports that can be supported, DMRS patterns, or high-layer signaling.

The specific implementation process of sending DMRS and acquiring DMRS provided by the present application will be described below.

Example 1

In the first embodiment, multiple DMRS configuration information tables are designed, which are referred to as DMRS configuration information tables for short. Each DMRS configuration information table is associated with the maximum number of orthogonal ports that can be supported, or for different DMRS patterns, or for different DMRS configuration type, design different DMRS configuration information tables; the maximum number of orthogonal ports that can be supported, or DMRS pattern, or DMRS configuration type can represent the DMRS transmission scheme; before transmission, select according to different pattern configuration information or configure in different DMRS switch in the information table.

As shown in FIG. 7 , the DMRS configuration information table is a DMRS configuration information table designed in which the maximum number of orthogonal ports that a single terminal (UE) can support is 4 in SU or MU-MIMO.

Table 1

Maximum 4 ports DMRS

The DMRS indication information or index is represented by Value; when Value=0, it indicates that the terminal supports the number of transport layers (represented by Rank Rank in the table) as 1, and the corresponding orthogonal port index (port index) is the transmission layer. Layer 1, the port number is 0; for another example, when the DMRS indication information Value=7, it indicates that the terminal supports a transport layer (Rank) of 4, and its corresponding orthogonal port index (port index) is 0-3 (port 0- 3).

As shown in Table 1, the port combinations listed in the table can basically cover all configurations of 4port and below, in which reserved can be used for additional combinations (combination) to increase scheduling flexibility, although the listed combinations can already meet the scheduling requirements.

The DMRS configuration information table shown in Table 1 is suitable for orthogonal DMRS to achieve maximum 4 streams/layer data transmission or the pattern corresponding to Figure 7 (such as the config.1 1 symbol shown in the left part or the config.1 2 shown in the right part. notation but with time domain repetition, e.g., TD-OCC{(1,1),(1,1)})

The DMRS configuration information table in this embodiment is designed according to the LTE table (that is, divided into columns by the number of codewords), and the corresponding value value requires an indication overhead of 3 bits.

It should be understood that the port index in the DMRS configuration information table is only a representation, which is only for illustration, and can also be represented by other numbers according to actual requirements.

As shown in Table 2, the DMRS configuration information table is a DMRS configuration information table designed in which the maximum number of orthogonal ports that a single terminal (UE) can support is 6 in SU or MU-MIMO.

Table 2

Maximum 6 ports DMRS

The indication information or index of the DMRS configuration information is represented by Value; for example, when the indication information of the DMRS configuration information is Value=0, it indicates that the terminal supports the number of transport layers (Rank) is 1, and the corresponding orthogonal port index (portindex). ) is 0; when the indication information of the DMRS configuration information is Value=10, the number of the terminal supporting the transport layer (Rank) represented by it is 3, and the corresponding orthogonal port index (port index) is 3 to 5; it needs to be explained Yes, the orthogonal port index here is only an example, and the specific orthogonal port number may be represented by other numbers.

The port combinations listed in the table shown in Table 2 can basically cover all configurations of 6 ports and below, in which reserved can be used for additional combinations (combination) to increase scheduling flexibility, although the listed combinations can already meet the scheduling requirements.

The DMRS configuration information table shown in Table 2 is suitable for orthogonal DMRS to achieve maximum 6 streams/layer data transmission or the pattern corresponding to Figure 8 (config.1 1 symbol shown in the left part or config.1 shown in the right part). 2 symbols but with time domain repetition, e.g., TD-OCC{(1,1),(1,1)}).

The DMRS configuration information table in this embodiment is designed according to the LTE table (that is, divided into columns by the number of codewords), and the corresponding value value requires an indication overhead of 4 bits.

As shown in Table 3, the DMRS configuration information table is a DMRS configuration information table designed in which the maximum number of orthogonal ports that a single terminal (UE) can support is 8 in SU or MU-MIMO.

table 3

Maximum 8 ports DMRS

The indication information of the DMRS configuration information is represented by Value; for example, when the indication information of the DMRS configuration information is Value=0, it indicates that the terminal supports the number of transport layers (Rank) is 1, and its corresponding orthogonal port index (portindex) is 0; for another example, when Value=15, it indicates that the number of transport layers (Rank) supported by the terminal is 4, and the corresponding orthogonal port index (port index) is 4 to 7; it should be noted that the positive value here is 4. The cross port index is only an example, and the specific orthogonal port number may be represented by other numbers.

As shown in Table 3, the port combinations listed in the table can basically cover all configurations of 8 ports and below, in which reserved can be used for additional combinations (combination) to increase scheduling flexibility, although the listed combinations can already meet the scheduling requirements.

The DMRS configuration information table shown in Table 3 is suitable for orthogonal DMRS to realize maximum 8 streams/layer data transmission or the pattern corresponding to FIG. 9 (config.1 2 symbols).

The DMRS configuration information table in this embodiment is designed according to the LTE table (that is, divided into columns by the number of codewords), and the corresponding value value requires an indication overhead of 4 bits.

As shown in Table 4, the DMRS configuration information table is a DMRS configuration information table designed for a maximum number of orthogonal ports that can be supported by a single terminal (UE) in SU-MU-MIMO.

Table 4

Up to 12 ports DMRS

The indication information of the DMRS configuration information is represented by Value; for example, when the indication information of the DMRS configuration information is Value=0, it indicates that the terminal supports the number of transport layers (Rank) is 1, and its corresponding orthogonal port index (portindex) is 0; for another example, when the indication information of the DMRS configuration information is Value=24, it indicates that the number of transport layers (Rank) supported by the terminal is 4, and the corresponding orthogonal port index (port index) is 8-11. It should be noted that the orthogonal port index here is only an example, and the specific orthogonal port number may be represented by other numbers.

The port combinations listed in the table shown in Table 4 can basically cover all configurations of 12 ports and below, in which reserved can be used for additional combinations (combination) to increase scheduling flexibility, although the listed combinations can already meet the scheduling requirements.

The DMRS configuration information table shown in Table 4 is suitable for orthogonal DMRS to realize maximum 12 streams/layer data transmission or the pattern corresponding to FIG. 10 (config.2 2 symbols).

The DMRS configuration information table in this embodiment is designed according to the LTE table (that is, divided into columns by the number of codewords), and the corresponding value value requires an indication overhead of 5 bits.

By implementing the embodiments shown in Tables 1 to 4 above, a corresponding DMRS configuration information table is designed for each maximum number of orthogonal ports that can be supported, which can meet the requirements of different scenarios in the NR system. For example, the pattern used in Ultra-Reliable and Low-Latency Communication (URLLC) scenarios is not only the pattern used in Enhanced Mobile Broadband (eMBB), but also for other different patterns. Rethink the design of the table.

In this embodiment, multiple DMRS configuration information tables are designed, which may also be different DMRS configuration information tables designed by DMRS pattern configuration type, referred to as DMRS configuration type. Switch between different information sheets.

There are two types of configuration types. The corresponding DMRS configuration information tables are the same as the maximum 8port (configuration type1) shown in Table 3 and the maximum 12port (configuration type2) shown in Table 4, which will not be repeated here. . The DMRS configuration information tables shown in Tables 1 to 4 correspond to different DMRS patterns, or to the maximum number of orthogonal ports supported by the system, or to different DMRS configuration types. The number of orthogonal ports 4, 6, 8, 12 or DMRS configuration type can be indicated by explicit signaling such as RRC, MAC CE or DCI, or can be bound with other configuration parameters corresponding to the scene, such as frequency, carrier spacing , frame structure, etc.

Embodiment 2

In this embodiment, the design method of the DMRS configuration information table by column will be described. Different from the column layout of LTE, in this embodiment, the division is not based on the codeword number, but is based on the maximum number of orthogonal ports that can be supported in a certain proportion. Divide or divide the number of orthogonal ports greater than a certain value and less than or equal to a certain value into two columns on the left and right, or according to the number of transmission layers (ie, UE RANK) of the receiving end.

As shown in Table 5, the maximum number of orthogonal ports that can be supported is 12 as an example.

table 5

Sort by a certain proportion of the total number of ports

The total number of layers or config.2 2symbol pattern, the ratio is 2/3

Table 5 shows that the information table is sorted by the maximum number of supportable and supportable orthogonal ports/2. This is only an illustration. In this embodiment of the present application, there may also be other sorting methods, such as Table 6 As shown in Table 7, the division is performed according to the number of transmission layers (RANK) of the UE. The principle is to make the number of rows of valid information in the left and right columns of the table as balanced as possible to further reduce storage overhead.

Table 6

Maximum 6 ports DMRS

Table 7

Maximum 4 ports DMRS

Embodiment 3

In this embodiment, multiple DMRS configuration information tables are integrated into one general information table, and selection is made according to the maximum number of supported orthogonal transmission layers or patterns or high-layer signaling, as shown in Table 8-0.

Table 8-0

The maximum number of orthogonal ports supported by the DMRS configuration information table shown in Table 8-0 is 12. Other port numbers, such as the DMRS configuration information corresponding to 4, 6, and 8, are all subsets of the total information table. When the configuration information is selected, the corresponding sub-table can be selected from the general information table according to the maximum number of orthogonal ports that can be supported or bound to the pattern, or according to the instructions of higher layer signaling, such as RRC signaling. For example, value0-7 corresponds to a total of 4 orthogonal ports, value0-13 corresponds to a total of 6 orthogonal ports, value0-19 corresponds to a total of 8 orthogonal ports, and value0-28 corresponds to a total of 12 orthogonal ports.

By implementing the above-mentioned method for sending DMRS provided by the present application, by designing multiple DMRS configuration information tables, the overhead can be reduced for the NR DMRS port indication.

In addition, as a specific implementation manner of integrating multiple DMRS configuration information tables into one general information table, the DMRS configuration information of the same DMRS configuration type can also be designed into one general table, and selected through DMRS symbol information.

Specifically, the DMRS configuration information table may include the symbol information of the Front-loaded (FL) DMRS, such as the number of DMRS symbols, where Table 8-1 corresponds to FL DMRS configuration type 1, and Table 8-2 corresponds to FL DMRS configuration type 2, that is, each table corresponds to a different FL DMRS type. In addition, the table may also contain state information of a CDM group (State of CDM group), and the state information of the CDM group may be used as rate matching information.

The symbol number column in Table 8-1 and Table 8-2 corresponds to Type 1 FL DMRS of 1 symbol and 2 symbols, respectively. In the embodiment of the present application, the DMRS port indication information of the 1-symbol and 2-symbol FLDMRS of the same FL DMRS configuration type is included in the same table, and the beneficial effect is that the DCI can indicate different states in the table, thereby realizing the dynamic 1-symbol Switch between FL DMRS with 2 symbols.

In addition, the following is only an example, and the states of the number of symbols are 1 and 2, which correspond to 1-symbol FL DMRS and 2-symbol FL DMRS, respectively. In one implementation, the number of symbols can be represented as 0 and 1, for example, 0 corresponds to 1 symbol FL DMRS, 1 corresponds to 2 symbol FL DMRS, or 1 symbol is represented as single symbol and 2 symbol is represented as double symbols. There may be various representation methods in specific implementation, which are not limited in the embodiments of the present application.

In another implementation manner, a column of symbol number may not be added to the DMRS configuration information table, but implicit indication is directly performed by the value value. For example, in Tables 8-1 and 8-2, the symbol number column can be removed, and other elements remain unchanged. At this time, the transmitting end can still complete the dynamic switching between the 1-symbol FL DMRS and the 2-symbol FL DMRS by indicating the value to the receiving end.

For example, value=18 in Table 8-1 contains DMRS port numbers greater than 3, and the port numbers of 1-symbol FL DMRS type1 are 0-3, so that the receiving end can know that the 2-symbol DMRS pattern is invoked. In one implementation method, the receiving end and the transmitting end can predefine some values to correspond to a 1-symbol FL DMRS pattern, and some values to correspond to a 2-symbol FL DMRS pattern. For example, in Table 8-1, the value 0- 10 corresponds to 1-symbol FL DMRS, and value>11 corresponds to 2-symbol FLDMRS. At this time, for the same scheduling content, value=0 corresponds to 1-symbol FL DMRS, and value=11 corresponds to 2-symbol FLDMRS. By indicating value 0 and value 11, the receiving end learns that the current call is a 1-symbol FL DMRS pattern or a 2-symbol FL DMRS pattern.

Table 8-1 Example of Port Combinations for Configuration Type 1 Considering the Number of Symbols

Table 8-2 Example of Port Combinations for Configuration Type 2 Considering the Number of Symbols

In an implementation method, the transmitting end, such as a network side device, may schedule only a part of the table, that is, a sub-table or a subset of the table in a certain scheduling, thereby saving DCI overhead.

In an implementation manner, the selection of the sub-table can be explicitly configured through RRC signaling, that is, the DMRS symbol information is indicated through RRC signaling, and the DMRS configuration type corresponding to the 1 symbol or the DMRS configuration type corresponding to the 2 symbol is dynamically scheduled. DMRS configuration type.

For example, for Table 8-2, the RRC signaling can indicate the table corresponding to the FL DMRS with active 1 symbol, such as the value0-22 items in 8-2 (ie, symbol number=1), or indicate that the entire table can be used, such as the table All lines in 8-2 (ie symbol number=1 and symbol number=2). In specific implementation, the RRC signaling configuration can be implemented in various ways, for example, it can be configured using independent RRC signaling or implicitly indicated by binding with other RRC signaling indicating FL DMRS information.

For explicit indication, it can be configured through an independent RRC signaling. For example, set1 and set2 are configured in RRC to correspond to certain predefined state sets (for example, set1 corresponds to the state of symbol number=1, and set2 corresponds to all states in the table), or directly indicates that some previous state (value) is activated (such as 8 In -1, '1010/binary' indicates that the value 0-10 of the first 11 items is used, or directly indicates a value value, and all the previous value states are activated), or configure the on/off state to enable (such as off means that only those with symbol number=1 are used, and on means that the entire table is used), or use bitmap to indicate each value in the table independently, and the specific RRC configuration method is not limited here.

In another implementation manner, the enabling of the sub-table can be bound with other RRC signaling, for example, it can be bound with a parameter in RRC indicating the maximum number of FL DMRS symbols, such as with DL-DMRS-max-len or UL-DMRS DMRS-max-len binding. The following takes DL as an example. When DL-DMRS-max-len=1, the maximum number of symbols representing FL DMRS is 1, that is, the system only calls FL DMRS with 1 symbol. At this time, the receiving end and the transmitting end only use The state corresponding to the 1-symbol FL DMRS in Table 8-2, for example, value=0-22. When DL-DMRS-max-len=2, the maximum number of symbols representing FL DMRS is 2, that is, the system can call the FL DMRS pattern of 1 symbol and the FL DMRS of 2 symbols. Use the states corresponding to the 1-symbol and 2-symbol FL DMRS in Table 8-2, that is, the states in the entire table can be used.

In addition, when the maximum number of FL DMRS symbols is different (for example, when DL-DMRS-max-len or UL-DMRS-max-len in RRC signaling is equal to 1 or 2), the corresponding DMRS port scheduling DCI signaling length is different , or the number of bits is different, the DCI field is different.

Embodiment 4

In this embodiment, a specific implementation manner of applying the method provided in this application to various NR scenarios will be described. Specifically, in a non-coherent joint transmission (NC-JT) 2PDCCH or 1PDCCH scenario, multiple DMRS configuration information tables bound with a pattern are set for two transmission points (TRPs).

In this embodiment, ports are selected from different DMRS port groups to form portcombinations. In a single PDCCH scenario, the base station needs to indicate these port combinations to the scheduling UE through one DCI, while in a two PDCCH scenario, these port combinations can be combined through two The DCI is indicated to the UE. The division of the DMRS port group is related to the pattern configuration and port mapping scheme. For example, configuration type 1 may have two port mapping schemes, as shown in Figure 11 or Figure 12, while configuration type 2 may have three portmapping schemes, as shown in Figure 13, Figure 14, and Figure 15 for decibels.

The above-mentioned various port mapping modes are respectively obtained by performing port code division multiplexing first and then frequency division multiplexing, or performing port frequency division multiplexing first and then code division multiplexing. Different port mappings will result in different DMRS port groups. The grouping is based on the fact that the ports for code division multiplexing in the same group can only be located in the same group.

As shown in Figure 11, the DMRS grouping is {(0,2,4,6), (1,3,5,7)} or the grouping of each group subset, such as {(0,2), (1,3)} .

The DMRS grouping in FIG. 12 is {(0, 1, 4, 6), (2, 3, 5, 7)} or a grouping of each group subset.

The DMRS groupings shown in Figure 13 are {(0,1,6,7), (2,3,4,5,8,9,10,11)} or {(0,1,6,7,4, 5, 10, 11), (2, 3, 8, 9)} or {(0, 1, 6, 7, 2, 3, 8, 9), (4, 5, 10, 11)} or each group grouping of subsets.

The DMRS grouping of Figure 14 is {(0,3,6,9), (1,4,7,10,2,5,8,11)} or {(0,3,6,9,1,4, 7,10), (2,5,8,11)} or {(1,4,7,10), (0,3,6,9,2,5,8,11)} or each group subset grouping.

The DMRS grouping of Figure 15 is {(0,1,6,9), (2,3,7,10,4,5,8,11)} or {(0,1,6,9,4,5, 8,11), (2,3,7,10)} or {(4,5,8,11), (0,1,6,9,2,3,7,10)} or each group subset grouping.

In this embodiment, ports need to be selected from different groups to form port combinations, so different port groups will form different port combinations. The following takes one of the port mapping schemes under various configurations as an example to design the DMRS configuration information table.

For example, as shown in Figure 16 is a schematic diagram of NC-JT pattern and port mapping, the corresponding quasi co-location (QCL) grouping situation is that TRP1 uses a port group composed of ports {0, 1, 6, 9}, and TRP2 uses a port group composed of ports {0, 1, 6, 9}. Ports {2,3,4,5,7,8,10,11}.

In order to support the 1PDCCH scenario of NC-JT as shown in Figure 16, the DMRS configuration information table shown in Table 9 is based on the DMRS configuration information table shown in Table 4, and the corresponding rows with value = 25 to 32 are added to the left column, Corresponding rows with value = 4 to 18 are added to the right column. For details, see Table 9.

Table 9

Maximum 12 ports DMRS (pattern config2-2symbol), single PDCCH

In order to support the 2PDCCH scenario of NC-JT as shown in Figure 16, the DMRS configuration information table shown in Table 10 is based on the DMRS configuration information table shown in Table 4, and the corresponding rows with value = 25 to 32 are added to the left column, Corresponding rows with value = 4 to 7 are added to the right column. For details, see Table 10.

Table 10

Maximum 12 ports DMRS (pattern config2-2symbol), 2PDCCHs

Figure 17 is another schematic diagram of the pattern and port mapping corresponding to NC-JT. The corresponding quasico-location (QCL) grouping situation is that TRP1 uses a port group composed of ports {0, 2, 4, 6}, and TRP2 Use ports {1,3,5,7}.

In order to support the 1PDCCH scenario of NC-JT as shown in Figure 17, the DMRS configuration information table shown in Table 11 is based on the DMRS configuration information table shown in Table 3, and the corresponding rows with value = 16 to 19 are added to the left column, Rows with value = 4 to 10 are added to the right column. For details, see Table 11.

Table 11

Maximum 8 ports DMRS (pattern config1-2symbol), single PDCCH

In order to support the 2PDCCH scenario of NC-JT as shown in Figure 17, the DMRS configuration information table shown in Table 12 is based on the DMRS configuration information table shown in Table 3, and the corresponding rows with value = 16 to 23 are added to the left column, See Table 12 for details.

Table 12

Maximum 8 ports DMRS (pattern config1-2symbol), 2PDCCHs

Figure 18 is another schematic diagram of the pattern and port mapping corresponding to NC-JT. The corresponding quasico-location (QCL) grouping situation is that TRP1 uses a port group composed of ports {0, 1}, and TRP2 uses port {2 ,3,4,5}.

In order to support the 1PDCCH scenario of NC-JT as shown in FIG. 18 , the DMRS configuration information table shown in Table 13 is based on the DMRS configuration information table shown in Table 2, and corresponding rows with value=12-15 are added to the right column. In the left column, the corresponding row with value=2 is added. For details, see Table 13.

Table 13

Maximum 6 ports DMRS (pattern config2-1symbol), single PDCCH

In order to support the 2PDCCH scenario of NC-JT as shown in Figure 28, the DMRS configuration information table shown in Table 14 is based on the DMRS configuration information table shown in Table 2, and the corresponding row with value = 12 is added to the left column. See Table 14 for the content.

Table 14

Maximum 6 ports DMRS (pattern config2-1symbol), two PDCCH

Figure 19 is another schematic diagram of the pattern and port mapping corresponding to NC-JT. The corresponding quasico-location (QCL) grouping situation is that TRP1 uses a port group composed of ports {0, 2}, and TRP2 uses port {1 ,3}.

In order to support the 1PDCCH scenario of NC-JT as shown in Figure 19, the DMRS configuration information table shown in Table 15-1 is based on the DMRS configuration information table shown in Table 1, and the corresponding row with value = 8 is added to the right column, For details, see Table 15-1.

Table 15-1

Maximum 4 ports DMRS (pattern config1-1symbol), single PDCCH

In order to support the 2PDCCH scenario of NC-JT as shown in Figure 19, the DMRS configuration information table shown in Table 15-2 is based on the DMRS configuration information table shown in Table 1, and the corresponding value = 8 to 9 is added to the left column. OK, see Table 15-2 for details.

Table 15-2

Maximum 4 ports DMRS (pattern config1-1symbol), two PDCCH

According to any one of the foregoing Embodiments 1 to 4, in response to different NR scenarios or transmission requirements, the transmitter selects appropriate DMRS configuration information, obtains DMRS indication information according to the selected DMRS configuration information, and sends it to Receiving end.

When the receiving end receives the value representing the DMRS indication information, it demodulates at the corresponding time-frequency resource position according to the number of orthogonal transmission layers or the orthogonal port number represented by the value, or the resources not occupied by the DMRS. reference signal.

In order to facilitate base station scheduling, in the MU-MIMO scenario, for a specific receiver, the DMRS ports are first scheduled from within a CDM group, and then across CDM groups. This scheduling rule can be called a CDM-first scheduling rule . Considering that the DMRS port indication table contains both SU and MU states, in particular, for SU-MIMO scheduling, different scheduling rules have different benefits. Examples will be given below for specific description. Consider the following port mapping sequence:

For 1-symbol DMRS type 1, CDM group 1 contains ports {0,1}, and CDM group 2 contains ports {2,3};

For 2-symbol DMRS type 1, CDM group 1 contains ports {0,1,4,5}, and CDM group 2 contains ports {2,3,6,7};

For 1-symbol DMRS type 2, CDM group 1 includes ports {0,1}, CDM group 2 includes ports {2,3}, and CDM group 3 includes ports {4,5}.

For 2-symbol DMRS type 2, CDM group 1 contains ports {0,1,6,7}, CDM group 2 contains ports {2,3,8,9}, CDM group 3 contains ports {4,5, 10,11}.

For the SU, the sender can allocate the DMRS ports of the receiver according to the following rules. It will be described in detail below. It is worth noting that only specific scheduling rules are given here. When the DMRS mapping rules are changed, the DMRS port number allocation in the example may change, but the scheduling rules will not change.

CDM priority scheduling: For the receiver, DMRS ports are scheduled from one CDM group first, and when all the port numbers in the CDM group are occupied, they are scheduled from another port group. This scheme has the same advantages as SU scheduling and MU scheduling. A specific example is given below for the DMRS type. The following example may be represented as a certain row (value) in the DMRS port scheduling table (eg, 8-1, 8-2).

For 1-symbol DMRS type 1, when the receiver is called to layer 2, the scheduling port can be 0, 1 (or 2, 3), that is, the scheduling port is in the same CDM group; when the receiver is called to layer 3, the scheduling port The ports can be 0, 1, 2, that is, CDM group 1 is all scheduled, and then port 2 in CDM group 2 is scheduled. The specific table 16-1 can be embodied as the following row status information.

Table 16-1 Example of DMRS Type 1

value number of co-scheduled CDM groups UE Rank ports symbol number X 1 2 0,1 1 Y 2 3 0,1,2 1

For 2-symbol DMRS type 1, when the receiver is called to layer 4, the scheduling port can be 0, 1, 4, 5, that is, the scheduling port is scheduled from the same CDM group first; when the receiver is called to layer 5 , the scheduling ports can be 0, 1, 4, 5, 2, that is, CDM group 1 is all scheduled, and then the ports in CDM group 2 are scheduled. Specifically, as shown in Table 16-2, it can be reflected as the following row status information:

Table 16-2 Examples of DMRS Type 1

For 1-symbol DMRS type 2, when the receiver is called to Layer 3, the scheduling ports can be 0, 1, and 2, that is, CDM group 1 is fully occupied, and then the ports in CDM group 2 are scheduled; When calling layer 5, the scheduling ports can be 0, 1, 2, 3, and 4, that is, CDM groups 1 and 2 are all occupied, and then the ports in CDM group 3 are scheduled, as shown in Table 16-3:

Table 16-3 Examples of DMRS Type 2

For 2-symbol DMRS type 2, when the receiver is called to Layer 3, the scheduling port can be 0, 1, 6, that is, CDM group 1 is occupied, that is, scheduling is given priority from CDM group 1; when the receiver is called At layer 5, the scheduling ports can be 0, 1, 6, 7, and 2, that is, CDM group 1 is all scheduled, and then the ports in CDM group 2 are scheduled, as shown in Table 16-4:

Table 16-4 Examples of DMRS Type 2

FDM priority scheduling: For the receiving end, DMRS port scheduling is first scheduled across CDM groups. After each CDM group has ports scheduled, it is scheduled from the first CDM group, and then continues to be scheduled across CDM groups. The main idea is to make the number of scheduled DMRS ports in each CDM group as average as possible. For example, when three ports are called, for type 2, one port is called in each of the three CDM groups. The scheme has the characteristic of averaging the DMRS ports used in each CDM group during SU scheduling, which makes the power in each CDM group more even. The order of the port numbers given below is only an example for better understanding. During the specific implementation, the writing order of the port numbers is not limited. For example, 0,2,1,3,4 can be written as 0,1,2,3, 4

For 1-symbol DMRS type 1, when the receiver is called to layer 2, the scheduling port can be 0, 2, that is, the port is preferentially scheduled across CDM groups; when the receiver is called to layer 3, the scheduling port can be 0, 1, 2 , that is, CDM groups 1 and 2 are scheduled to have one port each, and then the ports in CDM group 1 are called. As shown in Table 16-5:

Table 16-5 Examples of DMRS Type 1

For 2-symbol DMRS type 1, when the receiver is called to layer 2, the scheduling port can be 0, 2, that is, scheduling across CDM groups is prioritized; when the receiver is called to layer 5, the scheduling port can be 0, 2, 1, 3, and 4, that is, the scheduled DMRS ports are allocated as evenly as possible in the CDM group. As shown in Table 16-6:

Table 16-6 Examples of DMRS Type 1

For 1-symbol DMRS type 2, when the receiver is called to Layer 3, the scheduling ports can be 0, 2, and 4, that is, CDM groups 1, 2, and 3 are all occupied by 1 DMRS port; when the receiver is called with 4 When the layer is configured, the scheduling ports can be 0, 2, 4, and 1, that is, CDM groups 1, 2, and 3 are all occupied, and then the ports in CDM group 1 are re-scheduled. As shown in Table 16-7:

Table 16-7 Examples of DMRS Type 2

For 2-symbol DMRS type 2, when the receiver is called to layer 3, the scheduling port can be 0, 2, 4, and when the receiver is called to layer 8, the scheduling port can be 0, 1, 2, 3, 4,5,6,8. As shown in Table 16-8:

Table 16-8 Examples of DMRS Type 1

In addition, for the FDM-priority scheduling scheme, during specific implementation, the number of CDM groups scheduled by FDM-priority may be limited, so as to improve the spectrum efficiency during SU scheduling. For example, for three CDM groups in DMRS type 2, it may be limited to perform FDM priority scheduling for two of the CDM groups during SU. At this time, for type 2, when 6 layers (or 6 DMRS ports) are called, the scheduling ports can be 0, 1, 2, 3, 6, 8, that is, CDM groups 1 and 2 are scheduled. When When Layer 8 is scheduled, the scheduling ports can be 0, 1, 2, 3, 6, 7, 8, and 9, that is, CDM groups 1 and 2 are both called with 3 ports. The advantage of this solution is that CDM group 3 can be used to transmit data and improve spectral efficiency. As shown in Table 16-9:

Table 16-9 Examples of DMRS Type 2

Continuous port number scheduling: For the receiving end, DMRS ports are continuously scheduled according to the size of the DMRS port numbers. Nothing to do with the program has the characteristics of simple table design. For example, the corresponding DMRS port numbers for layer 3 are 0-2, the corresponding DMRS port numbers for layer 5 are 0-4, and the corresponding DMRS ports for layer 8 are 0-7.

During specific implementation, the above scheduling rules may be combined, supplemented, or appear simultaneously. For example, for a table containing both 1-symbol and 2-symbol DMRS type 1 (or type 2), the table may contain CDM priority scheduling, FDM priority scheduling, and continuous port number scheduling to increase the flexibility of system scheduling.

In an implementation method, for the same number of scheduling layers with the same symbol number, the table may simultaneously include two states of CDM priority scheduling and FDM priority scheduling, thereby increasing scheduling flexibility or spectrum efficiency. As shown in Table 16-10:

Table 16-10 Examples of DMRS Type 1

Alternatively, in an implementation manner, the table may use a continuous port number scheduling rule for a number of scheduling layers greater than a specific number, and use an FDM or CDM priority scheduling rule for a number of scheduling layers less than a specific number. As shown in Table 16-11:

Table 16-11 Examples of DMRS Type 1

value number of co-scheduled CDM groups UE Rank ports symbol number X 3 3 0,2,4 2 Y 2 8 0-7 2

Alternatively, different scheduling rules or a combination of multiple rules may be used in the table for 1-symbol or 2-symbol FL DMRS configurations. For example, the FDM-first scheduling rule is used for the 1-symbol of type 2, and the FDM-first scheduling rule is used for the 2-symbol of type 2 for two CDM groups, so as to improve the spectral efficiency of SU scheduling when the 2-symbol is used. As shown in Table 16-12:

Table 16-12 Examples of DMRS Type 2

It should be noted that the above embodiments only provide SU scheduling rules, and there are no restrictions on specific port mappings. It can be understood that, for specific different port mapping sequences, the same scheduling rule can obtain different scheduled DMRS port numbers. . For example, when the port in CDM group 1 is {0,1,4,5} and the port in CDM group 2 is {2,3,6,7}, according to the principle of FDM scheduling priority, the port number corresponding to layer 6 is 0,1 ,2,3,4,6; and when the ports in CDM group 1 are {0,1,4,6} and the ports in CDM group 2 are {2,3,5,7}, according to the FDM scheduling priority principle, The port numbers corresponding to Layer 6 are 0, 1, 2, 3, 4, and 5; it is understandable that in the case of different port mapping sequences, the above two port number scheduling technologies are essentially the same.

To sum up, in the DMRS configuration information table provided in this embodiment of the present application, CDM group information, or DMRS symbol information, or RMI information may be added to perform rate matching.

This will be described in detail below. Table 17-1 and Table 17-2 are DMRS port assignment tables corresponding to different DMRS configurations (DMRS configuration types), wherein Table 16-1 corresponds to DMRS type 1, and Table 17-2 corresponds to DMRS type 2. Here, Tables 17-1 and 17-2 are divided into two columns according to the number of codewords to save bit overhead. In the specific implementation, the structure of the table can be designed in other ways. This is just an example.

In this embodiment, it is assumed that the specific DMRS port mapping rules of DMRS type 1 and type 2 are as follows:

For 1-symbol DMRS type 1, CDM group 1 contains ports {0,1}, and CDM group 2 contains ports {2,3};

For 2-symbol DMRS type 1, CDM group 1 contains ports {0,1,4,5}, and CDM group 2 contains ports {2,3,6,7};

For 1-symbol DMRS type 2, CDM group 1 includes ports {0,1}, CDM group 2 includes ports {2,3}, and CDM group 3 includes ports {4,5}.

For 2-symbol DMRS type 2, CDM group 1 contains ports {0,1,6,7}, CDM group 2 contains ports {2,3,8,9}, CDM group 3 contains ports {4,5, 10,11}.

In specific implementation, there may be different DMRS port mapping rules, and this embodiment is only for convenience of description. Specifically, for different mapping rules, the rules scheduled in the table will not change.

It can be seen that, for each DMRS configuration, the symbol number information (symbol number) of the DMRS and the RMI information can be added to the table to perform rate matching of the DMRS.

Optionally, the RMI information that can be used for DMRS rate matching here can be the number of occupied CDM groups in the current system, or can be the combined state of occupied CDM groups in the current system, or can be occupied CDM groups. The serial number of the group, the number of co-scheduled CDM groups given in Table 17-1 and Table 17-2 are only examples. For the two methods of the number of CDM groups or the combined state of occupied CDMs, the methods in the foregoing embodiments may be used. For the occupied CDM group serial number method, an implementation method is, when one CDM group is occupied, the RMI in the corresponding table is "1", indicating that CDM group 1 is occupied, and when 2 CDM groups are occupied, the corresponding In the table, the RMI is "1,2", indicating that CDM groups 1 and 2 are occupied. When three CDM groups are occupied, the corresponding RMI in the table is "1,2,3", indicating that CDM groups 1, 2, and 3 are occupied. Occupation, during specific implementation, the corresponding relationship between the number of occupied CDM groups and the CDM group serial numbers may be changed, and this is only an example.

Optionally, the symbol information of the DMRS is added to the table. In an implementation method, only a part of the table may be used in a certain scheduling, so as to save the overhead of DCI. For example, when the current maximum number of DMRS symbols in the system is 1 symbol, only the state corresponding to 1 symbol in the table is configured in a certain scheduling, that is, the state corresponding to symbol number=1. When the system notifies that the current maximum number of DMRS symbols is 2 , configure all the states in the table. The table configuration method can be the solution given in the previous embodiment, such as using independent RRC signaling to select a part of the table, such as the state corresponding to symbol number=1, or the configuration of the table can be related to the maximum number of DMRS symbols. For the signaling binding, the specific implementation may use the method in the above embodiment, which will not be repeated here. In another implementation method, the table may not include information on the number of DMRS symbols, that is, a column of symbol number, and the DMRS symbol information is implicitly represented by the value value. Corresponds to information of 1-symbol DMRS type 1, and value=11-34 corresponds to information of 2-symbol DMRS type 1.

Optionally, the table may include multiple scheduling rules at the same time. For example, in Table 17-1, under one codeword, value=2 corresponds to the current number of orthogonal ports (layers) at the receiving end is 2, and the port number is 0, 1, which is the CDM priority scheduling rule, and value=35 corresponds to the receiving end The current number of orthogonal ports is 2, the port numbers are 0, 2, and the FDM priority scheduling rule. In the specific implementation, the states of value=2 and value=35 can be kept in the table at the same time to meet the flexibility of scheduling; or only value=35 can be kept, and value=2 can be removed to ensure that SU is FDM priority scheduling. The receiving end can implicitly learn that the current state is SU according to the port number scheduling rule; or can keep value=2, remove value=35, and perform scheduling based on the CDM priority principle to improve spectrum efficiency. Specifically, in Table 17-1, value=0-34 is a solution to meet the basic scheduling requirements, and value=35-38 is a different scheduling method. In an implementation method, the table may not include value=35 -38 to reduce overhead, or one or more of value=35-38 can be replaced with one or more items of value=0-34 to achieve specific scheduling requirements, or value=35 can be reserved in the table One or more of -38 for flexible scheduling. Similarly, in Table 17-2, under two codewords, value=24 is the scheduling rule for CDM priority at layer 6, value=73 is the scheduling scheme for consecutive DMRS port numbers at layer 6, and value=74 is 2 CDMs at layer 6 For the FDM priority scheduling rule in the group, in the specific implementation, any one or more of the three schemes can be reserved to meet the requirements of flexible scheduling or saving overhead. Specifically, in Table 17-2, value=0-70 is a solution to meet the basic scheduling requirements, and value=71-81 is a different scheduling method. In the specific implementation, the table may not include value=71-81 To reduce overhead, or replace one or more items of value=71-81 with one or more items of value=0-70, such as retaining the state of value=71 and removing the state of value=2 under one codeword , to achieve specific scheduling requirements, or one or more items of value=71-81 can be reserved in the table to achieve flexible scheduling. It can be understood that the scheduling solutions given in Tables 17-1 and 17-2 are only examples. In specific implementation, other scheduling solutions can be added to improve scheduling flexibility and meet scheduling requirements.

Optionally, Tables 17-1 and 17-2 provide a solution for saving DCI overhead through the number of codewords. In specific implementation, classification may not be performed by the number of codewords. For example, the number of orthogonal ports at the receiving end (the number of DMRS orthogonal ports) can be divided into multiple columns to save DCI overhead; or table 17-1 (or table The states of one codeword and two codeword in 17-2) are divided into different tables, corresponding to different bit overheads; or the states of one codeword and two codeword in table 17-1 (or table 17-2) can be encoded together, as shown in the table The value=0-38 of 17-1 corresponds to the state where the number of orthogonal layers at the receiving end is less than or equal to 4, and the value greater than or equal to 39 corresponds to the state in the twocodeword in Table 17-1 (the number of orthogonal layers at the receiving end is greater than 4), a The implementation method is shown in Tables 16-3 and 17-4. In the specific implementation, the order of the indicated states can be changed, or some items can be replaced or removed to achieve different scheduling requirements, and a certain scheduling can also be configured to use the table. In order to save overhead, see the foregoing embodiments for the specific implementation method. In addition, the table can contain the indication of SU and MU status, as shown in brackets in Tables 17-3 and 17-3. It is understandable that the specific implementation may not contain the status indication information of SU and MU, which is only given here. one possible implementation.

Table 17-1 Example of DMRS port combination type 1

Table 17-2 Example of DMRS port combination type 2

Table 17-3 Example of DMRS port combination type 1

Table 17-4 Example of DMRS port combination type 2

In LTE, during MU-MIMO, a maximum of 4 orthogonal ports are supported, and these ports use the same RE resources. The advantage of this design is that the rate matching (RM) problem of DMRS in MU-MIMO can be effectively avoided. To put it simply, rate matching means that the terminal needs to know which REs in its time-frequency resources have no data transmission, so as to avoid these REs during data demodulation, so as to perform correct data decoding. For example, during downlink transmission, some REs in the time-frequency resources of the terminal may be occupied by control channels or RSs. If the base station does not notify the terminal of the location information of these REs, the terminal will treat the RSs or control information of these locations as data. demodulation, thereby introducing decoding errors.

In a single user multiple-input multiple-output (SU-MIMO) scenario, the base station communicates with only one terminal, and only information (RS, control signaling, data, etc.) of the terminal is transmitted in the time-frequency resources. At this time, the terminal can directly know the RE positions of its own DMRS according to its own information (such as its own port, number of layers, etc.), and avoid these REs during data decoding. Therefore, there is no rate matching problem of DMRS in SU.

For multi-user MIMO (multi-user multiple-input multiple-output, MU-MIMO), the base station communicates with multiple terminals at the same time, and the terminals use orthogonal DMRS ports to ensure orthogonality. Orthogonality can be guaranteed using time division multiplexing (TDM), frequency division multiplexing (FDM), or code division multiplexing (CDM). When using TDM and FDM, orthogonal DMRS ports occupy different time and frequency resources. At this time, the REs occupied by the DMRS port cannot transmit data of other DMRS ports. For example, if port1 and port2 are orthogonal through FDM or TDM, and port1 occupies RE1, the base station will not transmit the data of port2 on RE1, so as to prevent the data of port2 from causing noise interference to the DMRS of port1 and affecting the channel estimation accuracy. However, when port1 and port2 are orthogonal through CDM, the above problem does not exist. This is because although the DMRS of port1 and port2 occupy the same RE, they are multiplexed by code division multiplexing, thus ensuring two Orthogonality between the DMRSs of the ports.

In MU-MIMO, the terminal needs to know the port information of other terminals that are co-scheduled, so as to obtain which RE positions are occupied by the DMRS of the ports used by other terminals, and will not transmit the data of the terminal. If the terminal cannot obtain the information, the terminal will demodulate the DMRS of other users as its own data, resulting in a decoding error.

In LTE, the rate matching problem of MU-MIMO is solved by ensuring that the DMRS of the scheduling port is multiplexed by CDM. At this time, the DMRS of all terminals are multiplexed with the same RE through CDM, thus avoiding the ratematching problem of DMRS. , this design can be called MU-MIMO transparent to the terminal. However, as described above, in order to ensure this transparent design in LTE, MU-MIMO can only support a maximum of 4 orthogonal ports.

In NR systems, such as 5G, in order to give full play to the advantages of MU-MIMO, the design of MU-MIMO supporting 12 maximum orthogonal ports has been adopted in the standard. Considering that the DMRS pattern adopted in the existing standard can only support CDM multiplexing of a maximum of 4 ports, the transparent solution in LTE is no longer applicable.

Therefore, a new MU-MIMO DMRS rate matching design is very important. The DMRS rate matching can be solved in the following ways:

The first type: the resource unit corresponding to the DMRS, for example, all subcarriers in the symbol position do not transmit data: this scheme does not require signaling indication, but will cause a large waste of spectrum resources. For example, in Figure 20, UE0 uses ports 1 to 4, UE1 uses ports 5 to 8, and all REs corresponding to the positions of ports 9 to 12 do not transmit data, which will cause a huge waste of resources.

The second is to directly notify the UE of the port numbers of other UEs: when other UEs occupy more ports, it will cause a large signaling overhead. For example, when UE0 uses ports 1 to 2, and UE1 uses ports 5 to 8, the It is necessary to notify UE0 of ports 5-8 used by UE1, and notify UE1 of ports 1-2 used by UE0. In this way, the required signaling overhead is particularly large.

Specifically, a 1/0 bit map is required to indicate the absolute position of the DMRS port group. For example, each DMRS port group in Figure 34 uses 1 bit for individual indication. For the 6 port groups in Figure 20, 6 bits are required to indicate the actual number of transmission layers and Use port allocation rule constraints: for example, directly indicate the number of layers scheduled by the current base station. For Figure 20, there is a possibility that layers 1-12 need to be indicated respectively, and 4 bits are required to indicate.

In order to achieve more efficient data transmission, the present application proposes a rate matching indication scheme corresponding to the maximum number of supported ports or DMRSpattern or the number of CDM port groups in the pattern or DMRS configuration type to match 5G DMRS transmission requirements.

The following describes the DMRS rate matching indication and receiving method provided by the present application.

As shown in FIG. 21 , a method for indicating and receiving the rate matching of a demodulation reference signal provided by the present application. The method can include:

S201: The transmitting end generates demodulation reference signal DMRS indication information; the DMRS indication information is used to indicate the resources that are not occupied by the DMRS in the resources that can be used to bear the DMRS;

Wherein, the DMRS indication information indicates the quantized current number of orthogonal transmission layers, or the combination of the currently used port group status, or the number of orthogonal transmission layers or port group status currently not used by the receiving end, or needs to be silenced resource element to indicate the resources not occupied by the DMRS among the resources available for carrying the DMRS.

In an implementation manner, before the transmitting end sends the DMRS indication information, the method further includes:

Sending DMRS transmission scheme indication information to indicate the current DMRS transmission scheme; different DMRS transmission schemes correspond to different maximum numbers of orthogonal ports that can be supported, or corresponding DMRS patterns or corresponding DMRS configuration types.

Specifically, different maximum supportable ports or DMRS patterns (or the number of CDM port groups in the DMRS pattern), or DMRS configuration types are indicated by different DMRS indication information. For example, for orthogonal ports, the maximum supportable ports MU-MIMO scenarios with numbers of 4, 6, 8, and 12, or for non-orthogonal ports, the maximum supported ports are 8, 12, 16, and 24; these maximum supported ports have corresponding DMRS rates. Matching state information, at least two of these DMRS rate matching states are different.

The DMRS indication information is to let the receiver know the rate matching status, that is, in the time-frequency resource, which resource units are not occupied by the DMRS of other receivers, but are used for data transmission, and the receiver can demodulate the data. Correct data decoding is performed on these resource units.

In another implementation manner, the DMRS indication information refers to different DMRS patterns or the number of DMRS port groups included in the DMRS patterns (for example, there may be two tables corresponding to the DMRS patterns containing 2 or 3 DMRS port groups respectively) Generally speaking, a DMRS pattern corresponds to a MU-MIMO scenario that supports the maximum number of supported ports. The DMRS pattern indicates how many orthogonal CDM port groups it supports. Each port group consists of Therefore, different DMRS indication information is configured for different DMRS patterns, and the receiver can also indicate which resource units have not been used for DMRS transmission in the time-frequency resources, but are used for data transmission. The receiving end can correctly demodulate the data.

In another implementation manner, the DMRS indication information may also be configured for a DMRS configuration type (configrationtype).

In specific implementation, therefore, for the convenience of description in the embodiments of the present application, the above DMRS indication information may be represented by a value value, and in specific implementation, it may be N bits, where N and the DMRS port included in the DMRS pattern The number of groups M (CS/OCC/CS+OCC), related. For different patterns or DMRS configuration types (types), the number of values for X can be different. For example, for a DMRS configuration type1 including 2 DMRS port groups (M=2), N may be 1 bit or 2 bits, and for a DMRS configuration type2 including 3 DMRS port groups (M=3), N may be 2 or 3 bits.

As shown in Table 18 below, this is an example of DMRS indication information. The DMRS indication information in this embodiment is mainly used for rate matching, so it is represented by Rate matching indication information. The specific form is not limited to the following forms, and can be a table , or numbers, or formulas, in which there are states in P, the number of P can be full N bits (full of all signaling states), or greater than N bits (increasing system scheduling flexibility or other design requirements), or less than N bits (quantized to save signaling overhead). M_p is rate matching information (Rate matching information, RMI) or a parameter set (parameter set) including DMRS rate matching information, and the terminal may complete rate matching on DMRS according to the instruction of M_p. The above rate matching state information is represented by RMI in the following and in the figures, which is only for the convenience of description, and its meaning is not limited. In a specific implementation, the rate matching state information may be represented by a quantized value of the number of orthogonal transmission layers, or represented by the aforementioned methods such as port numbers or CDM groups.

Table 18

The rate matching indication information is related to the rate matching state information. When the rate matching state information can be represented by a specific number of orthogonal transmission layers, the above DMRS indication information is determined from the DMRS configuration information, and the DMRS configuration information also includes Including indication information of the total number of orthogonal ports, the indication information of the total number of orthogonal ports may indicate the number of all orthogonal ports that may actually appear, or the quantized value of the number of all orthogonal ports that may actually appear. The quantized value of the number of all orthogonal ports is DMRS orthogonal layer number information, or DMRS antenna orthogonal port set indication information, or CDM group information of DMRS antenna orthogonal ports, or information generated according to the CDM size.

In a specific implementation, the quantized value of the number of orthogonal transmission layers may be DMRS layer number information, or DMRS antenna port set information, or CDM group information of DMRS antenna ports. In the information on the number of DMRS layers, the number of DMRS layers is an integer multiple of the number of DMRS antenna ports in a CDM group. For example, for a DMRS pattern with two DMRS antenna port groups, assuming that port group 1 is {1, 2, 3, 4} and port group 2 is {5, 6, 7, 8}, it can be quantized as 4 layers and 8 floors. In addition, in the information on the number of DMRS layers, the number of DMRS layers may also be an integer multiple of the number of consecutive DMRS antenna ports in a CDM group in ascending order, for example, for a CDM group {1, 2, 5, 7} and {3, 4, 6, 8}, which can be quantized into 2 and 4 layers. All these information allow the receiving end to identify which resource units are used for DMRS transmission at the receiving end, and which resource units are used for DMRS transmission at other receiving ends for CDM multiplexing, and the remaining resource units are used for the transmission of DMRS at the receiving end. The data transmission related to the receiving end, therefore, the receiving end performs data demodulation on the corresponding resource unit.

It should be understood that the content of the rate matching status information may vary according to the port mapping order of the DMRS pattern, for example, it may include but not limited to:

1. DMRS port group mute status or used status: The rate matching status information indicates the status of each DMRS port group, the RM content has nothing to do with the port mapping order, and the CDM group numbering order is not specifically limited, for example, it can be based on the ports in the port group. The smallest sequence number is sorted from smallest to largest.

2. The current number of orthogonal transmission layers of the quantized system

Assuming that the DMRS port number is p=y+v, and y is the port number offset, it can be guaranteed that p is the minimum value of the DMRS port defined by NR, and v=1, 2, . . . is the current number of orthogonal transmission layers of PDSCH (in LTE is 8ports). Quantize v in sub-bins to save the DCI signaling overhead of rate matching.

2.1. The current total number of layers of the system quantified by the upward grading (the content of the rate matching status information is related to the mapping order) can be equal to the number of consecutive port numbers or the maximum port number in each CDM group (assuming y=0, only when each The port numbers in the CDM group are consecutive from small to large, or from large to small), such as {1,2,3,4}{5,6,7,8}{9,10,11,12}, For the same DMRS pattern, the RMI content will change when the mapping order is changed.

2.2. The current total number of orthogonal transmission layers of the system with downward quantization. In this method, the content of the rate matching status information has nothing to do with the mapping order of the DMRS pattern, which can be equal to the minimum continuous port number of the CDM group, or it starts from 1 Quantization of numbering (assuming y=0, ports are numbered from 1).

2.3 When port numbers in a DMRS group are sorted from small to large, starting from small, the number of consecutive DMRS numbers, such as two DMRS port groups {1,2,5,6} and {3,4,7,8}, can be quantified for 2 and 4 layers.

It should be noted that the reason why the quantization value of the number of orthogonal transmission layers is used is that if you want to indicate the specific number of orthogonal transmission layers at the receiving end, such as indicating the number of orthogonal transmission layers {1, 2, 3, 4}, you need to 2 bits to indicate, and quantize the number of orthogonal transmission layers {1, 2, 3, 4} into a value, for example, quantize up to the number of orthogonal transmission layers of 4, or quantize down to the number of orthogonal transmission layers of 1 , or use 2 or 3 to represent the number of shuffled orthogonal transmission layers {1, 2, 3, 4,} to indicate that the quantization value of the number of orthogonal transmission layers only needs one bit to indicate, for example, use 0 to represent orthogonal transmission The quantization value of the number of layers is 4, so the indication overhead can be reduced.

2.4 DMRS group status information or DMRS group serial number or group number; or the number of DMRS groups, where the number of CDM groups is the CDM group that is occupied/scheldued in the system.

S202: The transmitter sends DMRS indication information through time-frequency resources.

In the specific implementation, the embodiments of the present application indicate the rate matching modes corresponding to different maximum numbers of supported ports or different DMRS patterns through DMRS indication information. One way is implicit indication, and the other way is through explicit signaling. way to indicate.

In the implicit indication scheme, the quantization value of the number of orthogonal transmission layers is configured in the DMRS configuration information table, and the DMRS indication information is indicated by the DMRS indication information (value) in the DMRS configuration information table; the DMRS configuration information table can be Similar to that in LTE, for example, the number of antenna ports (Antenna ports), the scrambling code indication (scrambling identity) and the number of layers indication (number of layers) in LTE, it may also include the number of DMRS ports, port index, At least one of sequence generation information and CDM type, and on this basis, a quantization value of the number of orthogonal transmission layers is added. The DMRS configuration information table can be stored on the transmitter and receiver at the same time, and the transmitter sends indication information to the receiver. It should be understood that the transmitter sends the original DCI signaling in LTE to the receiver (due to the use of LTE signaling , the DCI signaling may not be named as indication information, but it can indicate a rate matching scheme), the receiving end obtains its own port information and the total number of quantized transmission layers of the system through this signaling, and combines the two information to calculate out the port used by other receivers. That is, the receiving end identifies which resource units are used for the DMRS transmission of the receiving end, which resource units are used for the DMRS transmission of other receiving ends of CDM multiplexing, and the remaining resource units are used for the receiving end. Therefore, the receiving end performs data demodulation on the corresponding resource unit.

In the explicit signaling indication scheme, the above-mentioned correspondence between the DMRS indication information and the rate matching state information exists independently from the DMRS configuration information table in LTE, that is, the correspondence between the DMRS indication information and the rate matching state information It is not implied in the DMRS configuration information table, so the transmitting end and the receiving end not only save the DMRS configuration information table, but also save the corresponding relationship configuration table of the DMRS indication information and the rate matching state information (or the information table can be passed through. RRC configuration), the corresponding relationship configuration table exists independently of the DMRS configuration information table, the transmitting end sends the rate configuration indication information to the receiving end through explicit signaling, and the receiving end uses the DMRS indication information as an index. The corresponding rate matching state information is searched in the correspondence configuration table, and the receiving end combines the rate matching state information with the DMRS configuration information table to identify which resource units are used for being occupied by the DMRS of the receiving end, and which resource units are used. It is occupied by the DMRS of other receiving ends that are multiplexed by CDM, and the remaining resource units are used for data transmission related to the receiving end. Therefore, the receiving end performs data demodulation on the corresponding resource units.

It should be noted that the DMRS indication information of the same value can correspond to the quantized values of different orthogonal transmission layers, so the correspondence between the DMRS indication information and the quantized values of the orthogonal transmission layers can also be performed through separate signaling. instruct. It should be understood that, for the explicit indication scheme, the number of quantized orthogonal transmission layers is indicated by the DMRS indication information, and the receiving end will receive two signalings, one is the DMRS DCI signaling in LTE, and the other is used for The DMRS indication information of the current quantized orthogonal transmission layer number or the signaling including the DMRS indication information (also referred to as ratematching indication signaling herein) is transmitted.

It can be understood that, in either the implicit indication or the explicit indication scheme, when the above-mentioned DMRS indication information is sent to the receiving end, it can be sent in the form of independent signaling, or it can be carried in downlink signaling and sent. It is not limited here.

The above-mentioned signaling for sending the DMRS indication information, and the signaling indicating the correspondence between the DMRS indication information and the quantized value of the number of orthogonal transmission layers, can be controlled by radio resource control (radio resource control, RRC), media access control control unit ( media access control control element, MAC CE) or DCI is sent to the receiving end, or any two or three combinations of these three signaling.

In an implementation manner, the signaling is determined by the number of codewords (codewords) whether to send the DMRS indication information. For example, if there is one codeword, signaling is triggered to send the DMRSDMRS indication information, but if there are two codewords, the signaling is not sent. The reason is that the SU-MIMO (single user multiple-input multiple-output, SU- In the MIMO) scenario, the transmitting end, such as the base station, only communicates with one receiving end (terminal), and only the information (RS, control signaling, data, etc.) of the terminal is transmitted in the time-frequency resource. At this time, the terminal can directly know the RE positions of its own DMRS according to its own information (such as its own port, number of layers, etc.), and avoid these REs during data decoding. Therefore, there is no rate matching problem of DMRS in SU.

S203: The receiving end receives the DMRS indication information.

S204: Obtain rate matching information according to the DMRS indication information, and perform data demodulation on the resources on which the DMRS is not transmitted.

In the specific implementation, if it is a recessive indication method, after receiving the DMRS indication information, the receiving end uses its value as an index, and searches the DMRS configuration information table for the corresponding quantization value of the number of orthogonal transmission layers (and then learns the DMRS layer information, or DMRS antenna port set information, or code division multiplexing CDM group information of DMRS antenna ports, etc.), as well as the number of layers, DMRS port numbers and other information used by itself, and then the receiving end identifies which resource units are used. For the DMRS transmission of the receiving end, which resource units are used for the DMRS transmission of other receiving ends of CDM multiplexing, and the remaining resource units are used for the data transmission related to the receiving end. Therefore, the receiving end is in the corresponding resources. Data demodulation is performed on the unit. If it is an explicit indication method, in the case where the transmitter and the receiver save the DMRS configuration information table and the indication information configuration table separately (or the DMRS configuration information table can be configured through RRC), the receiver will The indication information is used as an index to look up the corresponding rate matching state in the corresponding relationship configuration table, and the receiving end combines the rate matching state information with the DMRS configuration information table to identify which resource units are used for the DMRS of the receiving end Transmission, which resource units are used for DMRS transmission by other receivers (optional, in one implementation method, this information can be obtained directly through rate matching information), and the remaining resource units are used for this receiver. Therefore, the receiving end performs data demodulation on the corresponding resource unit.

The DMRS indication and receiving method provided in this application can also be applied to a non-coherent joint transmission (NC-JT) 2PDCCH scenario. Data transmission is performed after the resource unit corresponding to the DMRS of the local transmitter. It can be understood that the transmitters mutate each other's DMRS ports group to each other. In specific implementation, the TRP may mutate the DMRS corresponding RE position in the QCL group of the other party's TRP by default. For DMRS pattern type1, which includes two DMRS port groups, in the NC-JT scenario, the two DMRS port groups can be non-QCL, and the ports in each DMRS port group are QCL. In this case, Two TRPs can use one port group respectively, so this solution can be solved directly without additional signaling indication. For DMRSpattern type2, which contains 3 DMRS port groups, there may be a scenario where one TRP uses one DMRS port group and another TRP uses two DMRS port groups. In this case, the TPR containing two DMRS port groups The indication information is required for indication, and the TPR using one DMRS port group may be indicated without indication information.

In the 1PDCCH scenario, an independent indication can also be used, and the specific process can still refer to the steps shown in Figure 21:

It should be noted that, in step S201, the DMRS indication information is generated by the transmitting end of the unrelated joint transmission, and the DMRS indication information is generated according to the DMRS ports in the QCL group that can be used by multiple TRPs that are coordinated;

In step S202, the transmitting end sends DMRS indication information to the receiving end. For the 1PDCCH scenario, the DMRS indication information indicates the resource unit corresponding to the DMRS that can be used by the multiple TRPs in cooperation, and for the 2PDCCH scenario, the rate matching information indicates the current transmission The resource unit corresponding to the DMRS used by the terminal.

After the receiving end receives the DMRS indication information, the operations are the same as S203 and S204 in the foregoing embodiment, and are not repeated here.

If the technical solution is applied to an uplink transmission scenario, the transmitting end may be a terminal, and the receiving end may be a network device, such as a base station. If the technical solution is applied in a downlink transmission scenario, the transmitting end may be a network device, such as a base station, and the receiving end may be a terminal.

The method for indicating DMRS rate matching provided by this application, through DMRS indication information corresponding to the maximum number of supported ports or DMRS pattern or DMRS configuration type, can be matched with various scenarios of NR, such as NC-JT or dynamic TDD or flexible In duplex scenarios, the above method can be applied to scenarios where NR is complex and changeable, and can also meet the requirements of higher-layer data transmission and reduce the indication overhead.

It can be understood that the DMRS ports here refer to all the DMRS ports supported by the system. As for the actual implementation, whether all the DMRS ports are used in a scheduling process, or some DMRS ports among all the DMRS ports are used, This application is not limited.

The specific implementation process of the method for indicating DMRS rate matching and the method for receiving DMRS rate matching provided by the present application will be described below.

Embodiment 5

The fifth embodiment mainly describes designing explicit signaling to indicate DMRS indication information.

As shown in Figure 22, the maximum number of orthogonal ports supported by TRP0 is 12, wherein the ports allocated to terminal 0 (UE0) are 1, 2, 7, and 8 ports, and the ports allocated to terminal 1 (UE1) It is 3,4,9,10ports.

In this scenario, there are various DMRS ports used by UE0 and UE1. Figure 23 is a schematic diagram of a mapping rule for 12 DMRS ports, wherein each shaded small square indicates that one DMRS port group is mapped To RE, n=0. The 12 DMRS ports are divided into 3 DMRS port groups, which are DMRS port group 1, DMRS port group 2, and DMRS port group 3;

Each DMRS port group includes 4 DMRS ports. The same time-frequency resources are multiplexed between the DMRSs corresponding to the DMRS ports in each DMRS port group in a CDM manner. The mapping rules for the three DMRS port groups are as follows:

The time-frequency resource mapped by the first DMRS port group includes the 12nth, 12n+1st, 12n+6th, and 12n+7th subcarriers of the resource unit in the frequency domain.

The time-frequency resources mapped by the second DMRS port group include, in the frequency domain, the 12n+2, 12n+3, 12n+8, and 12n+9 subcarriers of the resource unit.

The time-frequency resources mapped by the third DMRS port group include the 12n+4th, 12n+5th, 12n+10th, and 12n+11th subcarriers of the resource unit in the frequency domain.

Among them, n can be greater than or equal to 0, and less than any one or more integers of . In the following description, the number of subcarriers of the resource unit in the frequency domain is M as an example, where M is an integer greater than or equal to 1. For example, if the resource unit is one RB pair (two RBs in the instant domain direction), then M=12; if the resource unit is two RBs in the frequency domain direction, then M=24. Each CDM group occupies two consecutive symbols in the time domain.

Suppose DMRS port group 1 contains DMRS ports {1, 2, 7, 8}, DMRS port group 2 contains DMRS ports {3, 4, 9, 10}, DMRS port group 3 contains DMRS ports {5, 6, 11, 12 }. This is only an example, and the specific DMRS port mapping manner is not limited. It is worth noting that when the DMRS port mapping method is changed, the rate matching status information will also change. According to the method introduced in this solution, those in related fields can easily obtain it. In a specific implementation, if the DMRS port mapping mode is changed and the rate matching state information is changed, the quantization value representing the number of orthogonal transmission layers of the rate matching state information may also change accordingly. Therefore, the correspondence between the DMRS indication information and the quantized value of the number of orthogonal transmission layers can be indicated by one signaling.

The value of the DMRS indication information Value can be represented in two ways, one is decimal and the other is binary.

When value=0 (decimal) or 00 (binary), the corresponding quantization value of the number of orthogonal transmission layers (shown as RMI in the figure) is 4, indicating that the current number of quantization layers is 4; when Value=1 or 01 , which means RMI=8; when Value=2 or 10, the corresponding RMI=12; when value=3 or 11, it means RMI=reserved (reserved value), which can be vacant or can be Place other states, such as the quantized layer 4 transmission states corresponding to the 2nd and 3rd port groups (or 1st and 3rd port groups) being occupied. At this time, it is assumed that the base station schedules in the order of port group numbers.

At this time, when the DMRS indication information is indicated by binary, it can be indicated by 2 bits.

As shown in the previous table 4 is the SU/MU MIMO DMRS configuration information table that supports a maximum of 12 orthogonal ports, which is similar to the DCI signaling table of LTE DMRS, this table is only applicable to transparent MU-MIMO, the receiving end Obtain information such as its own DMRS port and the number of orthogonal transmission layers through this table. In addition, according to the RMI indicated by the received DMRS indication information (specific value of value), the receiving end can also know the quantized current number of orthogonal transmission layers, or the currently used port group status combination, or the current non-local receiving end The number of orthogonal transmission layers or the state of the port group used, or the resource unit to be muted, so as to know the resources that are not occupied by the DMRS among the resources that can be used to carry the DMRS, so that the DMRS port information of other paired terminals can be obtained to complete the rate matching. .

When the value of the DMRS indication information value received by UE0 is 1 (decimal) or 01 (binary), the quantization value representing the current number of orthogonal transmission layers is 8, so that both DMRS port group 1 and DMRS port group 2 are occupied . Combined with its own port information obtained in Table 4, UE0 knows that DMRS port group 1 includes its own DMRS port, while DMRS port group 2 does not include its own DMRS port, thus learning that DMRS port group 2 is used by other terminals and will not transmit own data. Similarly, UE1 learns that the quantization value of the number of orthogonal transmission layers is 4 through the instruction, and combines with its own port information obtained in Table 4, and then learns that DMRS port group 1 and DMRS port group 2 are occupied, so as to know that it is not its own The DMRS port group 1 position used will not transmit its own data. In addition, UE0 and UE1 know that the position of DMRS port group 3 can transmit data through the rate matching information.

The above is just an example. For different DMRS patterns and different port mapping methods, the value of RMI and the representation of the DCI information table can be different. For example, the RMI shown in the above example is the current number of quantization layers, or it can be the DMRS port group. serial number.

The maximum number of supported ports supported by the system shown in Figure 22 is 12. In other implementations, the TRP can also support the maximum number of supported ports such as 4, 6, and 8. The maximum number of supported ports it supports can be passed through Explicit signaling, such as RRC, MAC CE or DCI indication, can also be bound with other configuration parameters corresponding to the scene, such as frequency, carrier spacing, frame structure, etc.

As shown in Figure 24, the maximum number of supported ports supported by TRP0 is 6, wherein the ports allocated to terminal 0 (UE0) are 1, 2 ports, and the ports allocated to terminal 1 (UE1) are 3, 4 ports.

In this scenario, the DMRS ports used by UE0 and UE1 have multiple multiplexing methods. As shown in Figure 25, it is a schematic diagram of a mapping rule for 6 DMRS ports, wherein each shaded small square represents a DMRS port REs to which the group is mapped, n=0. The 6 DMRS ports are divided into 3 DMRS port groups, which are DMRS port group 1, DMRS port group 2, and DMRS port group 3;

The time-frequency resource mapped by the DMRS port group 1 includes at least one of the 12n, 12n+1, 12n+6, and 12n+7th subcarriers of the resource unit in the frequency domain.

The time-frequency resource mapped by the DMRS port group 2 includes at least one of the 12n+2, 12n+3, 12n+8, and 12n+9th subcarriers of the resource unit in the frequency domain.

The time-frequency resource mapped by the DMRS port group 3 includes at least one of the 12n+4th, 12n+5th, 12n+10th, and 12n+11th subcarriers of the resource unit in the frequency domain.

Among them, n can be greater than or equal to 0, and less than any one or more integers of . 3 CDM groups occupy 1 symbol in the time domain.

When value=0 (decimal) or 00 (binary), the corresponding quantization value of the number of orthogonal transmission layers (shown as RMI in the figure) is 2, indicating that the current number of quantization layers is 2; when Value=1 or 01 , which represents RMI=4, when Value=2 or 10, the corresponding RMI=6; when value=3 or 11, it represents RMI=reserved (reserved value).

At this time, when the DMRS indication information is indicated by binary, it can be indicated by 2 bits.

Similarly, the receiving end can also know the quantized current number of orthogonal transmission layers, or the currently used port group state combination, or the current non-receiving The number of orthogonal transmission layers or port group status used by the terminal, or the resource unit to be muted, so as to know the resources that are not occupied by DMRS among the resources that can be used to carry DMRS, so that the DMRS port information of other paired terminals can be obtained. match. Further, in combination with the SU/MU MIMO DMRS signaling table supporting 6 orthogonal DMRS ports in Table 2, the DMRS port information of other paired terminals can be obtained. For example, when the value of the DMRS indication information value received by UE0 is 1 (decimal) or 01 (binary), the quantization value representing the current number of orthogonal transmission layers is 4, assuming that DMRS port group 1 includes DMRS ports {1, 2} , DMRS port group 2 includes DMRS port {3, 4}, DMRS port group 3 includes DMRS port {5, 6}, according to the rate matching information, it can be known that DMRS port group 1 and DMRS port group 2 are used, DMRS port group 3 is not used. At this time, the terminal can learn the position of the port group used by other terminals in combination with its own DMRS port information.

As shown in Figure 26, the maximum number of supported ports supported by TRP0 is 8, wherein the ports allocated to terminal 0 (UE0) are 1, 2, 3, and 4 ports, and the ports allocated to terminal 1 (UE1) are 5, 6,7,8ports.

In this scenario, the DMRS ports used by UE0 and UE1 can be multiplexed in multiple ways. Figure 27 is a schematic diagram of a mapping rule for 8 DMRS ports, where each shaded small square represents a DMRS port REs to which the group is mapped, n=0. The 8 DMRS ports are divided into 2 DMRS port groups, which are DMRS port group 1 and DMRS port group 2 respectively; each DMRS port group includes 4 DMRS ports.

The same time-frequency resources are multiplexed between the DMRSs corresponding to the DMRS ports in each DMRS port group in a CDM manner. The mapping rules for these two DMRS port groups are as follows:

The time-frequency resources mapped by each DMRS port group are mapped to two consecutive symbols in the time domain, and:

The time-frequency resources mapped by the DMRS port group 1 all include at least one of the 12n, 12n+2, 12n+4, 12n+6, 12n+8, and 12n+10 subcarriers of the resource unit in the frequency domain.

The time-frequency resources mapped by the DMRS port group 2 all include at least one of the 12n+1, 12n+3, 12n+5, 12n+7, 12n+9, and 12n+11 subcarriers of the resource unit in the frequency domain.

Among them, n can be greater than or equal to 0, and less than any one or more integers of .

When value=0 (decimal) or 00 (binary), the corresponding quantization value of the number of orthogonal transmission layers (shown as RMI in the figure) is 4, indicating that the current number of quantization layers is 4; when Value=1 or 01 , which represents RMI=8. In addition, it can represent a combination of two CDM groups. For example, when value=0 (decimal) or 00 (binary), it means that DMRS port group 1 is used, and when Value=1 or 01, DMRS port group 1 and DMRS port group are used. 2 are used.

At this time, when the DMRS indication information is indicated by binary, it can be indicated by 1 bits.

Similarly, the receiving end can also know the quantized current number of orthogonal transmission layers, or the currently used port group state combination, or the current non-receiving The number of orthogonal transmission layers or port group status used by the terminal, or the resource unit that needs to be muted, so as to know the resources that are not occupied by DMRS among the resources that can be used to carry DMRS, so as to obtain the DMRS port information of other paired terminals. ratematching. The following takes the port group state combination as an example, and the quantization parameter layer number scheme can refer to the previous example. For example, when the value of the DMRS indication information received by UE0 is 1 (decimal) or 01 (binary), it means that both DMRS port group 1 and DMRS port group 2 are occupied. The used DMRS port group, so as to know that other port groups are used by other UEs and will not transmit their own data, so as to perform rate matching.

As shown in Figure 28, the maximum number of supported ports supported by TRP0 is 4, wherein the ports allocated to terminal 0 (UE0) are 1,2 ports, and the ports allocated to terminal 1 (UE1) are 3,4 ports. In this scenario, the DMRS ports used by UE0 and UE1 can have multiple CDM multiplexing methods. As shown in Figure 29, it is a schematic diagram of a mapping rule for two DMRS ports, wherein each shaded small square represents one For REs to which the DMRS port group is mapped, the four DMRS ports are divided into two DMRS port groups, which are DMRS port group 1 and DMRS port group 2 respectively; each DMRS port group includes two DMRS ports.

The same time-frequency resources are multiplexed between the DMRSs corresponding to the DMRS ports in each DMRS port group in a CDM manner. The mapping rules for these two DMRS port groups are as follows:

The time-frequency resource mapped by each DMRS port group is mapped to 1 symbol in the time domain, and:

The time-frequency resource mapped by the DMRS port group 1 includes the 2nth subcarrier of the resource element in the frequency domain.

The time-frequency resource mapped by the DMRS port group 2 includes the 2n+1th subcarrier of the resource unit in the frequency domain.

Among them, n can be greater than or equal to 0, and less than any one or more integers of .

Assuming that DMRS port group 1 includes DMRS ports {1, 3}, and DMRS port group 2 includes DMRS ports {2, 4}, at this time, when value=0 (decimal) or 00 (binary), the corresponding orthogonal transmission The quantization value of the number of layers (indicated by RMI in the figure) is 2, indicating that the current number of quantization layers is 2; when Value=1 or 01, it indicates that RMI=4.

At this time, when the DMRS indication information is indicated by binary, it can be indicated by 1 bits.

Similarly, the receiving end can also know the quantized current number of orthogonal transmission layers, or the currently used port group state combination, or the current non-receiving The number of orthogonal transmission layers or the state of the port group used by the terminal, or the resource unit to be muted, can obtain the DMRS port information of other paired terminals to perform rate matching. For example, when the value of the indication information value received by UE0 is 1 (decimal) or 01 (binary), the quantization value representing the current number of orthogonal transmission layers is 4. At this time, the terminal obtains the DMRS port group 1 through the rate matching information. DMRS port group 2 and DMRS port group 2 are both occupied, and the DMRS port group used by other terminals can be known in combination with the DMRS port used by itself, so as to perform rate matching. It should be noted that, when the solutions in FIG. 27 and FIG. 29 can also be quantized into layers 1 and 2 according to the scheduling order of the base station, such as FDM first and then CDM scheduling, the rate matching information in this embodiment can be configured with the DMRS pattern (type) or the number of port groups included in the DMRS pattern, thereby simplifying the storage overhead at the receiving end.

When the above TRP supports the maximum number of supported ports such as 4, 6, 8, and 12, the maximum number of orthogonal transmission layers that can be supported will be different for different DMRS patterns and DMRS port mapping methods. The rules are summarized as follows:

The number of quantized orthogonal transmission layers can be obtained in the following ways. Only a rule is given here. The specific implementation can be directly stored as a value without the selection process:

Assuming that the quantization of all DMRS ports starts from 1, then in each DMRS port group, when the port numbers are sorted from small to large, the number of quantization layers can be,

For example, port group 1{1,2,3,4}port group 2{5,6,7,8}, quantized to 4,8;

For example, port group 1{1,3,5,7}port group 2{2,4,6,8}, quantized to 1,2;

For example, port group 1{1,2,5,7}port group 2{3,4,6,8}, quantized to 2,4;

Such as port group 1 {1, 2, 5, 6} port group 2 {3, 4, 7, 8}, the quantization is 2, 4.

For example, port group 1{1,2,3,4}port group 2{5,6,7,8}port group 3{9,10,11,12}, quantized to 4,8,12;

For example, port group 1{1,4,7,10}port group 2{2,5,8,11}port group 3{3,6,9,12}, quantized to 1,2,3;

For example, port group 1{1,2,7,8}port group 2{3,4,9,10}port group 3{5,6,11,12}, quantized to 2,4,6;

For example, port group 1{1,2,7,10}port group 2{3,4,8,11}port group 3{5,6,9,12}, quantized to 2,4,6;

By implementing the above embodiments, the corresponding DMRS configuration information table is designed for each maximum supportable and supportable transport layer, which can meet the requirements of different scenarios in the NR system.

Embodiment 6

For different DMRS patterns, design different signaling to indicate. Wherein, for different DMRS port mapping modes, the content in the table may be different, which may be the quantized current orthogonal transmission layer number or the state of the DMRS port group.

As shown in FIGS. 30( a ) to 30 ( e ), the schematic mapping sequence is a DMRPattern in which CDM mapping is first followed by FDM mapping.

For each DMRS pattern, the corresponding indication information costs are different, for example:

For the pattern shown in Figure 30(a) that supports 4 orthogonal ports, 1 bit is required to indicate RMI. When the RM indicates Value=0 or 00, it indicates that the rate matching state information RMI is 2, that is, the current orthogonality The quantization value of the number of transmission layers is 2; when Value=1 or 01, it means the rate matching state information RMI=4;

For the pattern shown in Figure 30(b) that supports 8 orthogonal ports, 1 bit is required to indicate RM. When the value of RM indicates Value=0/00, it indicates that the rate matching RMI is 4; when Value=1/01 When it means that the rate matches RMI=8;

For the pattern supporting 6 orthogonal ports shown in Figure 30(c), 2 bits are required to indicate RM. When the RM indicates Value=0/00, it means that the rate matching RMI is 2; when Value=1/01 When , it means rate matching RMI=4; when Value=2/10, it means rate matching RMI=6;

For the pattern shown in Figure 30(d) that supports 12 orthogonal ports, 2 bits are required to indicate RM. When the RM indicates Value=0/00, it means that the rate matching RMI is 4; when Value=1/01 When , it means rate matching RMI=8; when Value=2/10, it means rate matching RMI=12;

For the pattern shown in Figure 30(e) that supports 12 orthogonal ports, 2 bits are required to indicate RM. When the RM indicates Value=0/00, it means that the rate matching RMI is 2; when Value=1/01 When , it means that the rate matching RMI=4; when Value=2/10, it means that the rate matching RMI=6.

As shown in FIGS. 31( a ) to 31 d ), the schematic mapping sequence is a DMRPattern in which FDM mapping is first followed by CDM mapping.

For each DMRS pattern, the corresponding indication information costs are different, for example:

For the pattern shown in Figure 31(a) that supports 4 orthogonal ports, 1 bit is required to indicate RMI. When the value of the RM indication is Value=0/00, it means that the rate matching RMI is 1; when Value=1/01 When it means that the rate matches RMI=2;

For the pattern that supports 8 orthogonal ports shown in Figure 31(b), 1 bit is required to indicate RM. When the value of RM indicates Value=0/00, it means that the rate matching RMI is 1; when Value=1/01 When it means that the rate matches RMI=2;

For the pattern shown in Figure 31(c) that supports 6 orthogonal ports, 2 bits are required to indicate RM. When the RM indicates Value=0/00, it means that the rate matching RMI is 1; when Value=1/01 When , it means that the rate matching RMI=2; when Value=2/10, it means that the rate matching RMI=3; when the RM indicates that the value is Value=3/11, it means that the rate matching RMI is reserved;

For the pattern shown in Figure 31(d) that supports 12 orthogonal ports, 2 bits are required to indicate RM. When the RM indicates Value=0/00, it means that the rate matching RMI is 1; when Value=1/10 When , it means that the rate matching RMI=2; when Value=2/10, it means that the rate matching RMI=3; when the RM indicates that the value is Value=3/11, it means that the rate matching RMI is reserved;

In addition, under this port mapping scheme, multiple DMRS patterns can correspond to the same RM table, for example, 31(a) and 31(b) can correspond to the same rate matching table, such as the table 31(a), and 31 (c) and 31(d) may correspond to the same rate matching table, such as the table of 31(c), and the table may correspond to the DMRS type, or the number of port groups in the DMRS pattern. The advantage of this method is that the overhead of terminal storage can be saved.

As shown in Figures 32(a) to 32(d), the schematic mapping sequence is a CDM and FDM hybrid port mapping manner.

For each DMRS pattern, the corresponding indication information costs are different, for example:

For the pattern shown in Figure 32(a) that supports 4 orthogonal ports, 1 bit is required to indicate RMI. When the value of the RM indication is Value=0/00, it means that the rate matching RMI is 2; when Value=1/01 When it means that the rate matches RMI=4;

For the pattern that supports 8 orthogonal ports shown in Figure 32(b), 1 bit is required to indicate RM. When the value of the RM indication is Value=0/00, it means that the rate matching RMI is 2; when Value=1/01 When it means that the rate matches RMI=4;

For the pattern shown in Figure 32(c) supporting 6 orthogonal ports, 2 bits are required to indicate RM. When the RM indicates Value=0/00, it means that the rate matching RMI is 2; when Value=1/01 When , it means the rate matching RMI=4; when Value=2/10, it means the rate matching RMI=6; when value=3/11, it means that the rate matching RMI value is reserved;

For the pattern shown in Figure 32(d) that supports 12 orthogonal ports, 2 bits are required to indicate RM. When the value of RM indicates Value=0/00, it indicates that the rate matching RMI is 2; when Value=1/01 When , it means that the rate matching RMI=4; when Value=2/10, it means that the rate matching RMI=6; when the RM indicates that the value is Value=3/11, it means that the rate matching RMI is reserved;

In addition, under this port mapping scheme, multiple DMRS patterns can correspond to the same RM table, for example, 32(a) and 32(b) can correspond to the same rate matching table, such as 32(a), and 32 (c) and 32(d) may correspond to the same rate matching table, such as the table of 32(c), and the table may correspond to the DMRS type, or the number of port groups in the DMRS pattern. The advantage of this method is that the overhead of terminal storage can be saved.

As shown in FIGS. 33( a ) to 33 ( d ), they illustrate the port group usage status of the DMRS pattern.

For each DMRS pattern, the corresponding overhead of the DMRS indication information is different, for example:

For the pattern shown in Figure 33(a) that supports 4 orthogonal ports, 1 bit is required to indicate the RMI. When the value of the RM indication is Value=0/00, it indicates that the rate matching RMI is 1, that is, the DMRS port group 1 is Occupied; when Value=1/01, it means that the rate matches RMI=2, at this time, it means that both DMRS port groups 1 and 2 are occupied;

For the pattern shown in Figure 33(b) that supports 8 orthogonal ports, 1 bit is required to indicate RM. When the value of RM indicates Value=0/00, it indicates that the rate matching RMI is 1, and the DMRS port group is 1 at this time. Occupied; when Value=1/10, it means that the rate matches RMI=2, at this time, it means that both DMRS port groups 1 and 2 are occupied;

Optionally, 33(a) and 33(b) may correspond to the same rate matching table, such as the rate matching table of 33(a), in which case the table may correspond to the DMRS type, or the number of port groups in the DMRS pattern. . The advantage of this method is that the overhead of terminal storage can be saved.

For the pattern that supports 6 orthogonal ports shown in Figure 33(c), 2 bits are required to indicate RM. When the value of RM indicates Value=0/00, it means that the rate matching RMI is 1, which means that the DMRS port group is 1 is occupied; when Value=1/01, it means rate matching RMI=2, which means DMRS port group 1 and 2 are occupied; when Value=2/10, it means rate matching RMI=3, which means DMRS port group 1, 2, and 3 are all occupied; when value=3/11, it means that the rate matching RMI=4, at this time, it means that DMRS port groups 2 and 3 are occupied; it should be noted that for RMI=4, the specific implementation is also Can be pre-defined as the occupied state of DMRS port groups 1 and 3, or can be reserved.

For the pattern shown in Figure 33(d) that supports 12 orthogonal ports, 2 bits are required to indicate RM. When the value of RM indicates Value=0/00, it means that the rate matching RMI is 1, which means that the DMRS port group is 1 is occupied; when Value=1/01, it means rate matching RMI=2, which means DMRS port group 1 and 2 are occupied; when Value=2/10, it means rate matching RMI=3, which means DMRS port group 1, 2, and 3 are all occupied; when value=3/11, it means that the rate matching RMI=4, at this time, it means that DMRS port groups 2 and 3 are occupied; it should be noted that for RMI=4, the specific implementation is also Can be pre-defined as the occupied state of DMRS port groups 1 and 3, or can be reserved. .

Optionally, 33(c) and 33(d) may correspond to the same rate matching table, and in this case, the table may correspond to the DMRS type, or the number of port groups in the DMRS pattern. The advantage of this method is that the overhead of terminal storage can be saved.

It is worth noting that the CDM combination in this solution is only an example, and in a specific implementation process, it can be reduced or increased, or replaced with other DMRS state combinations.

It should be noted that in the actual implementation process, the value can directly correspond to the occupied state combination of the port group, without RMI representation. For example, for Figure 33(a), it can be described as Table 19-1.

Table 19-1

In addition, optionally, the status of the SU can be added to the table, such as Table 19-2.

Table 19-2

value description 0/00 SU or 0 floor is occupied … ….

Layer 0 here is mainly used to notify that the terminal is currently in the SU state, and the specific expression form is not limited.

30 to 33 described above, for each pattern, or a type of DMRS configuration (type) or a DMRS pattern with the same number of port groups, the corresponding DMRS indication information is designed, which can meet the different requirements in the NR system. Scenario requirements, such as patterns for Ultra-Reliable and Low-Latency Communication (URLLC) scenarios, not just patterns for Enhanced Mobile Broadband (eMBB), for other different The pattern rethinks the design of the table.

Embodiment 7

DMRS configuration information and DMRS indication information can be indicated by a combination of RRC, MAC-CE, and DCI. For example, parameter set can be configured through RRC, which includes quantized orthogonal transmission layer information or CDM group. The status information is used for rate matching of DMRS, and the parameter set is selected by DCI signaling and notified to the terminal. The above multiple quantized orthogonal transmission layer number methods can be placed in the parameter set, where the parameter set can include other information, such as the start position and end position of the ZP-CSI-RS or PDSCH, and so on. The table given here is only an example, and the specific table format, size, and description format are not limited. During specific implementation, the parameter set may be configured through RRC, wherein the parameter set may include DMRS-related rate matching information as shown in Table 20.

Table 20

value description 0/00 Parameter set 1 1/01 Parameter set 2 2/10 Parameter set 3 3/11 Parameter set 4 … …

Embodiment 8

In this embodiment, relevant information about the total number of orthogonal transmission layers or the total number of orthogonal ports (the total number of orthogonal transmission layers and the total number of orthogonal ports in this paper are both numerically equal) is designed into the DMRS configuration information table, The information related to the total number of orthogonal ports is represented by indication information, and the indication information may indicate the number of all orthogonal ports that may actually appear, or the quantized value of the number of all orthogonal ports that may actually appear. The quantization value may be DMRS orthogonal layer number information, or DMRS antenna orthogonal port set indication information, or CDM group information of DMRS antenna orthogonal ports, or information generated according to the CDM size.

For the four patterns 34(a), 34(b), 34(c) and 34(d) in FIG. 34 , compared to the DMRS configuration information tables in Table 1 to Table 4, this embodiment adds The feature of the indication information of the total number of orthogonal transmission layers, as shown in the column of total or total layer number in the information table shown in Table 21 to Table 24, is the indication information of the total number of orthogonal transmission layers.

Table 21

port combinations for 1-symbol pattern in config.1

Table 22

port combinations for 2-symbol pattern in config.1

Table 23

port combinations for 1-symbol pattern in config.2

Table 24

port combinations for 2-symbol pattern in config.2

This embodiment considers all possible total orthogonal transmission layers, can adapt to all scenarios, and can be used for rate matching for multiple terminals performing MU adaptation.

Based on the content of the DMRS configuration information table provided in the foregoing embodiment, this embodiment adds the feature of the total number of orthogonal transmission layers, that is, the quantized layer number information, and the terminal can obtain the RMI information implicitly by combining this information .

This embodiment considers all possible total orthogonal transmission layers, and can adapt to all scenarios. The quantized layer num is the quantized value of the number of possible orthogonal transmission layers, and is indicated by the same value as the DMRS indication information (value) in the DMRS configuration information table; the DMRS configuration information table can be similar to that in LTE , for example, the number of antenna ports (Antenna ports), the scrambling identity (scrambling identity) and the number of orthogonal transmission layers (number of layers indication) in LTE, which may also include the DMRS port number, port index, sequence generation information, For at least one of the CDM types, on this basis, a quantization value of the number of orthogonal transmission layers is added. The DMRS configuration information table can be stored on the transmitter and receiver at the same time. When the transmitter needs to indicate the rate matching scheme to the receiver, it only needs to send an indication message to the receiver. Using it as an index, look up the quantization value of the corresponding orthogonal transmission layer number in the DMRS configuration information table, and learn the DMRS layer number information, or the DMRS antenna port set information, or also the code division multiplexing CDM group information of the DMRS antenna ports. and so on, and then the receiving end identifies which resource units are used for the DMRS transmission of the receiving end, which resource units are used for the DMRS transmission of other receiving ends of CDM multiplexing, and the remaining resource units are used for the receiving end. related data transmission, therefore, the receiving end performs data demodulation on the corresponding resource unit.

In another implementation manner, the indication information in this embodiment of the present application indicates the state of the DMRS port group used by the non-receiving end itself. Specifically, it can be indicated by DCI:

For the configuration shown in 34(a) and 34(b), it is indicated by the following Table 25:

Table 25

value MU Description 0 non-mute 1 MU all-mute

The table 25 may be configured at the transmitter and receiver according to the protocol, or may be sent by the transmitter to the receiver through RRC signaling.

The difference from the previous embodiment is that in this Table 25, the value corresponding to the value is no longer the quantized value of the number of orthogonal transmission layers, but represents the state of the DMRS port group used by the non-receiving end itself, for example, value=0 When value=1, it means that the state of the DMRS port group used by the non-receiver itself is non-mute, regardless of whether it is SU or MU pairing, and when value=1, it means that the state of the DMRS port group used by the non-receiver itself is all All-mute. After receiving the indication information (value), the receiving end can determine the state of the DMRS port group not used by itself, thereby completing rate matching. It should be noted that the MU column in Table 25 is only an example, and may be omitted in specific implementation.

For the configuration shown in 34(c) and 34(d), one way is to indicate whether the DMRS port group that is not used by itself is muted, as shown in Table 26 below, where the larger and smaller sets can be based on the non-receiving end itself. The relative relationship of the used port groups is determined. For example, for the scenario of 3 port groups, when the terminal uses 1 port group, the larger and smaller port groups can be determined according to the largest (or smallest) value in the remaining 2 port groups. ) relative relationship (such as size) of the port numbers is determined. In the specific implementation, the comparison process may not be included, and the larger and smaller port groups are directly stored in advance.

Table 26

value SU/MU Description 0 SU non-mute 1 MU mute smaller set 2 MU mute larger set 3 MU all-mute

Another way is to indicate the specific DMRS port groups that are not used by itself. For example, when the receiving end uses port group 1, when value=0, it means that it is not muted; when value=1, it means other MU pairing The receiver uses port group 2; when value=2, it indicates that other receivers for MU pairing use port group 3; when value=3, it indicates that other receivers for MU pairing use port group 2 and port Group 3. In the specific implementation, the serial number of the port group may not be defined, and the port group is indicated by the port number in the port group. For example, the port group 2 contains ports {5, 6, 7, 8}, and the port group 2 can be directly in the table. Replace with {5,6,7,8}, as shown in Table 27.

Table 27

value SU/MU Description 0 SU non-mute 1 MU port group 2 2 MU port group 3 3 MU All port groups or port group 2, port group 3

Another way is to use RRC+DCI multi-level indication, the way is as follows:

The rate matching information of DMRS can be indicated by RRC+DCI multi-level, or RRC+MAC CE+DCI multi-level indication

RRC can configure multiple sets of parameters including DMRS rate matching, which can be dynamically selected through DCI signaling

For example, RRC is configured with 2 parameter sets, and 1-bit DCI signaling is dynamically selected. Alternatively, RRC is configured with 4 parameter sets and 2-bit DCI signaling is dynamically selected, as shown in Table 28-1 and Table 28-2.

Table 28-1

1bit case

value of 'RE mapping' field Description 0/'00' parameter set 1 configured by higher layers 1/'01' parameter set 2 configured by higher layers

Table 28-2

2bits case

value of 'RE mapping' field Description 0/'00' parameter set 1 configured by higher layers 1/'01' parameter set 2 configured by higher layers 3/'10' parameter set 3 configured by higher layers 4/'11' parameter set 4 configured by higher layers

The parameter set contains the rate matching information of the DMRS, and the rate matching status information can be expressed in various forms, such as:

It can be the four states given in the above scheme, specifically the four states of 0, 1, 2, and 3 corresponding to the value value;

It can be the status information of whether each CDM group is occupied. For example, the CDM group can be numbered, such as 1, 2, and 3DMRS CDM groups; port number implementation.

It can be the specific location of ZP DMRS, corresponding to the location of multiple CDM groups (for example, using bitmap, for config1 2bits, for config2 3bits);

It can be a rate matching pattern, which directly indicates which REs on the DMRS symbol need to be muted. At this time, there is no concept of a CDM group.

In another implementation manner, the CDM group information is used in the DMRS configuration information table to implement the rate matching of the DMRS.

In an implementation manner, the RMI may be represented as the state information of the CDM group, such as the "State of CDM group" column of 8-1 and 8-2. The following is an example for a specific DMRS pattern, where the specific DMRS port number is only an example. For different port mapping sequences (port mapping), the DMRS port number (portindex) in the following embodiments may change, which is not limited here.

With reference to Figure 34 (the port group in Figure 34 is the CDM port group), for the FL DMRS configuration type 1 corresponding to Table 8-1, State 1 (State of CDM group=1) represents the CDM port group 1 (Figure 34(a) and ( The slashed part in b) is occupied; state 2 represents that CDM groups 1 and 2 are occupied (the slashed and horizontal parts in Figure 34(a) and (b));

For DMRS type 2 corresponding to Table 8-2, state 1 corresponds to CDM group 1 being occupied (the slashed part in Figure 34(c) and (d)), and state 2 represents that CDM groups 1 and 2 are occupied (Figure 34 (c) and (d) the dashed and dashed parts), state 3 represents that CDM groups 1, 2, and 3 are occupied (the slashed and dashed parts in Figure 34 (c) and (d), vertical bar).

The above only gives an example of an occupied state of a CDM group, and each state can be replaced with a state in which other CDM groups are occupied in a specific implementation. In addition, during specific implementation, the CDM group states specifically indicated in Table 8-1 and Table 8-2 (for example, State of CDM group=1, 2, and 3 in the table) can be replaced with occupied CDM group numbers (for example, CDM group numbers). group 1), or can be directly expressed as all port numbers in the CDM group (for example, CDM group 1 can be expressed as port numbers 0, 1 or 0, 1, 4, 6) or at least one DMRS port number in the occupied CDM group (For example, CDM group 1 can be represented as port number 0 or 0, 1). In addition, in the method of expressing all port numbers in the CDM group, the column of symbol number can be omitted in Table 8-1 and Table 8-2, and the 1 symbol or 2 symbol can be implicitly indicated by directly indicating all the port numbers in the CDM group. FL DMRS pattern, for example, for 1-symbol type1, CDM group 1 is represented as 0, 1, and for 2-symbol type1, CDM group 1 is represented as 0, 1, 4, 6, the receiving end can be implicitly based on the port number in the CDM group Obtain 1-symbol or 2-symbol DMRS information.

In another implementation manner, the RMI information of the table may indicate the number of occupied CDM groups, that is, "State of CDM group" in Tables 8-1 and 8-2 may be replaced with 'number of CDM groups' or 'number' of co-scheduled CDM groups', the specific text expression is not limited.

Table 29-1 shows an addition method corresponding to DMRS type 1. 'number of co-scheduled CDMgroups' indicates that one or two CDM groups in type 1 are occupied. In an implementation method, the number of CDM groups may be implemented according to a certain scheduling order, such as obtained according to the number of layers of orthogonal ports currently quantized in the foregoing embodiment. In an implementation method, the information on the number of CDM groups may directly correspond to a specific CDM group serial number, or be based on a certain scheduling rule. For example, for DMRS type 1, one CDM group can be occupied corresponding to CDM group 1, and two CDM groups can be understood as CDM group 1 and CDM group 2 are occupied. For DMRStype2, one CDM group can be occupied corresponding to CDM group 1, 2 CDM groups can be understood as CDM group 1 and CDM group 2 are occupied, and 3 CDM groups can be understood as CDM groups 1, 2, and 3 are occupied. In another implementation method, the number of CDM groups may not be bound with the CDM group serial number. For example, for DMRS type 1, one CDM group is used to indicate that only one CDM group is used in the system, and the CDM group can be CDM group 1 or CDM group 2, the receiver can obtain the serial number of the occupied CDM group according to its specific DMRS port number, 2 CDM groups means that both CDM groups are occupied, the receiver may use one or two CDM groups, if the receiver Using CDM group 2, it can be inferred that CDM group 1 is occupied by other receivers, thereby performing rate matching.

Table 29-1 Example of DMRS port combination type 1

In addition, in another implementation manner, the number of CDM groups added in the table may not include the number of CDM groups used by the receiver itself, that is, the table indicates the number of CDM groups currently used by the system and does not include the CDM group used by the receiver itself. The number, or can be understood as (the total number of occupied CDM groups in the system - the number of CDM groups used by the receiver). For example, for Type1, when a total of 2 CDM groups in the system are called and the receiver uses 2 CDM groups, the number of CDM groups used by the non-receiver itself is 0; when a total of 2 CDM groups in the system are called, the receiver uses For 1 CDM group, the number of CDM groups used by the non-receiver itself is 1; when a total of 1 CDM group is called in the system, the receiver uses 1 CDM group, and the number of CDM groups used by the non-receiver is 0. The number of CDM groups in this solution can be replaced by the number of co-scheduled CDM groups in Table D-1. Specific tables Researchers in the field can directly derive tables based on the above principles.

In addition, power boosting information can also be added to the above DMRS configuration information table. For example, a column is added in 29-1 to give the specific power boosting value of each state. The specific value can be 0db or 3dB for type 1, and for type 2 can be 0dB, 1.77dB, 4.77dB. In the table, the specific value of power boosting can be directly inferred according to the number of CDM groups occupied by the current state and the port information of the receiver, and the power boosting value has a one-to-one correspondence with the state.

The specific principle is that for DMRS type 1, when the receiver uses 1 CDM port group and the system currently has only 1 CDM port group occupied, the power boosting value is 0dB; when the receiver uses 2 CDM port groups , and the system currently has 2 CDM port groups occupied, the power boosting value is 0dB; when the receiver uses 1 CDM port group and the system currently has 2 CDM port groups occupied, the power boosting value is 3dB. An example corresponding to DMRS type 1 is given in Table 29-2. The specific port call and symbol number are not limited.

Table 29-2 Example of DMRS port combination type 1

For DMRS type 2, when the receiver uses 1 CDM port group and only 1 CDM port group is currently occupied in the system, the power boosting value is 0dB; when the receiver uses 2 CDM port groups and the system currently occupies 2 CDM port groups When 2 CDM port groups are occupied, the power boosting value is 0dB; when the receiver uses 1 CDM port group and the system currently has 2 CDM port groups occupied, the power boosting value is 1.77dB; When one CDM port group is occupied and three CDM port groups are currently occupied in the system, the power boosting value is 4.77dB. Here, when MU is limited, a receiver can only call four ports in one CDM group at most, that is, when MU, one receiver can only occupy one CDM group at most. An example corresponding to DMRS type 2 is given in Table 29-3. The specific port call and symbolnumber are not limited.

Table 29-3 Example of DMRS Port Combination Type 2

Embodiment 9

This embodiment is used to solve the DMRS rate matching problem in a non-coherent joint transmission (Non-coherent joint transmission, NC-JT2 PDCCH) scenario.

As shown in Figure 35, 12ports are supported in this Multi-TRP, NC-JT, 2PDCCH scenario, TRP0 uses {1, 2, 7, 10}; TRP1 uses {3, 4, 5, 6, 8, 9, 11 ,12}

A solution provided in this embodiment is a protocol default solution: TRP mutes the corresponding RE positions of DMRSs in one or more QCL groups that are not usable by the TRP itself by default. For example, for the DMRSpattern shown in Figure 36, that is, two DMRS port groups, the two TRPs will silence the time-frequency resource positions corresponding to the DMRS ports not used by themselves, so this solution can be solved directly without additional signaling instructions .

Another solution is the independent indication scheme as shown in Figure 37: TRP mutes the corresponding RE positions of DMRSs in one or more QCL groups that can be used by non-TRPs by default. In addition, for TRPs with multiple port groups, It sends the RM signal to the UE, and the rate matching signaling can be applied according to the previously introduced scheme. It should be noted that at this time, the rate matching signaling is based on the DMRS port that can be used by the current TRP or the maximum number of layers that can be supported or can be supported. The DMRS pattern corresponding to the DMRS port that can be used by itself is generated. The UE completes the rate matching according to the rate matching signaling received by the UE itself, and the solution may use the solution in the previous embodiment. Here, only one DMRS pattern is used as an example, for different DMRS patterns, corresponding RM signaling can be used.

For example, for Figure 37, TRP0 can only use DMRS port group 1, and TRP1 can use DMRS port group 2 and 3. At this time, TRP0 mutes the time-frequency resources corresponding to DMRS port groups 2 and 3, and TRP1 corresponds to DMRS port group 1. In addition, the terminal will receive the rate matching signaling of TRP1, which indicates the number of quantized orthogonal transmission layers in port groups 2 and 3, that is, the number of quantized orthogonal transmission layers of DMRS ports that can be used by TRP1, At this time, TRP0 may have no rate matching signaling, or the rate matching signaling may be sent to represent the status of the SU. The terminal receives the rate matching signaling of TRP1, completes the rate matching, and demodulates the data sent by TRP1.

It should be noted that, in this embodiment, the indication information may also be used to indicate the DMRS port group used by the non-receiving end itself. For example, when TRP0 enters the NC-JT mode, no signaling instruction is required, or the original signaling instruction is used. TRP1 is indicated by the following table. When value=0, it means that the DMRS port group not used by itself is not muted, and when value=1, the DMRS port group not used by itself is muted, as shown in Table 30. .

Table 30

value Description 0 non-mute 1 all-mute

Embodiment ten

The tenth embodiment is applicable to dynamic TDD or flexible duplex scenarios.

As shown in Figure 38, in Dynamic TDD, 12 ports are supported, TRP0 uses {1, 2, 3, 4} DMRS ports; TRP1 uses {5, 6, 7, 8} DMRS ports;

A solution provided in this embodiment is a protocol default solution: TRP mutes the corresponding RE positions of DMRSs in one or more QCL groups that are not usable by the TRP itself by default. For example, for the DMRS pattern shown in Figure 39, that is, two DMRS port groups, TRP0 and TRP1 each use one DMRS port group, and the time-frequency resource positions corresponding to the DMRS port groups not used by themselves are muted. Therefore, this solution can Directly resolved without additional signaling instructions.

Another solution is the independent indication scheme as shown in Figure 40: TRP mutes the corresponding RE positions of DMRSs in one or more QCL groups that can be used by non-TRPs by default. In addition, for TRPs with multiple port groups, It sends the RM signal to the UE, and the rate matching signaling can be applied according to the previously introduced scheme. It should be noted that at this time, the rate matching signaling can be based on the DMRS port that can be used by the current TRP or the DMRS corresponding to the DMRS port that can be used. pattern is generated. The UE completes the rate matching according to the rate matching signaling received by the UE itself, and the solution may use the solution in the previous embodiment. Here, only one DMRS pattern is taken as an example, for different DMRS patterns, corresponding RM signaling can be used.

For example, for Figure 40, TRP0 can only use DMRS port group 1, and TRP1 can use DMRS port group 2 and 3. At this time, TRP0 mutes DMRS port group 2 and 3, and TRP1 mutes DMRS port group 1. In addition, The terminal will receive the rate matching signaling of TRP1, which indicates the number of quantized orthogonal transmission layers of DMRS port groups 2 and 3, that is, the number of quantized orthogonal transmission layers of TRP1. At this time, TRP0 may not have rate matching signaling, or Rate matching signaling may be sent to represent the status of the SU. The terminal receives the rate matching signaling of TRP1, completes the rate matching, and demodulates the data sent by TRP1.

It should be noted that, in this embodiment, the indication information may also be used to indicate the DMRS port group used by the non-receiving end itself. For example, when TRP0 enters the NC-JT mode, no signaling instruction is required, or the original signaling instruction is used. TRP1, indicated by the following table, when value=1, the DMRS port group not used by itself is not muted, and when value=1, the DMRS port group not used by itself is muted, as shown in Table 31:

Table 31

value Description 0 non-mute 1 all-mute

The foregoing mainly introduces the solutions provided by the embodiments of the present application from the perspective of interaction between various network elements. It can be understood that each network element, such as a base station or a terminal. In order to realize the above-mentioned functions, it includes corresponding hardware structures and/or software modules for executing each function. Those skilled in the art should easily realize that the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In this embodiment of the present application, the base station or terminal may be divided into functional modules according to the foregoing method examples. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. The following is an example of dividing each function module corresponding to each function to illustrate:

FIG. 41 shows a schematic structural diagram of a transmitting end 350 . The transmitting end 350 may be the base station 100 or the terminal 200 mentioned above. The transmitting end 350 may include a processing unit 3501 and a sending unit 3502 . The processing unit 3501 may be configured to perform S101 in FIG. 6 , that is, select DMRS configuration information from multiple DMRS configuration information tables, and obtain DMRS indication information according to the DMRS configuration information, or perform S201 shown in FIG. 21 , that is, Demodulation reference signal DMRS indication information is generated; the DMRS indication information corresponds to a maximum supportable port number or DMRS pattern, or DMRS configuration type, and/or other processes used to support the techniques described herein. The sending unit 3502 may be configured to perform the action of S102 in FIG. 6 or S202 described in FIG. 21 , and the transmitting end performs the action of sending DMRS related information or DMRS indication information through time-frequency resources, and/or for supporting the technology described herein. other processes. All relevant contents of the steps involved in the foregoing method embodiments can be cited in the functional descriptions of the corresponding functional modules, which will not be repeated here.

FIG. 42 shows a schematic structural diagram of a receiving end 360 . The receiving end 360 may include a processing unit 3602 and a receiving unit 3603 . Wherein: the receiving end 360 may be the terminal 200 or the base station 100 mentioned above. The receiving unit 3603 is configured to perform the action of receiving the DMRS indication information performed by the receiving end in S103 in FIG. 6 or the action of receiving the DMRS indication information performed by the receiving end in S203 in FIG. 21 , and / The receiving end involved in the embodiments of this application receives any information. The processing unit 3602 can be used to perform S104 in FIG. 6, that is, according to the received DMRS indication information, or to perform S204 in FIG. 21, that is, according to the received DMRS indication information, to complete the demodulation reference signal, and/or other processes for supporting the techniques described herein. All relevant contents of the steps involved in the foregoing method embodiments can be cited in the functional descriptions of the corresponding functional modules, which will not be repeated here. For example, in the specific implementation process, it can be understood that the receiving end 360 first obtains the symbols carried on each RE by, for example, but not limited to, inverse Fourier transform (IFFT) (for example, obtaining the symbols carried on each RE of each OFDM symbol (for example, obtaining each subsection of each OFDM symbol). The symbol carried on the carrier), and then, according to the time-frequency resource where the DMRS is located, the DMRS is obtained from the obtained symbols.

In the embodiment of the present application, the transmitting end 350 to the receiving end 360 are presented in the form of dividing each functional module according to each function, or the form of dividing each functional module in an integrated manner. "Module" herein may refer to an application-specific integrated circuit (ASIC), a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the above-described functions , in which the processor and the memory can be integrated together or relatively independent.

In a simple embodiment, those skilled in the art can think of implementing any one of the transmitting end 350 to the receiving end 360 through the structure shown in FIG. 43 .

As shown in FIG. 43 , the apparatus 390 may include: a memory 3901 , a processor 3902 , and a communication interface 3903 . The memory 3902 is used to store computer-executed instructions. When the apparatus 390 is running, the processor 3901 executes the computer-executed instructions stored in the memory 3902, so that the apparatus 390 executes the information transmission method provided by the embodiments of the present application. For the specific information transmission method, reference may be made to the relevant descriptions above and in the accompanying drawings, and details are not repeated here. Wherein, the communication interface 3903 may be a transceiver.

Optionally, the device 390 may be a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), or a central processing unit (central processing unit). processor unit (CPU), network processor (NP), digital signal processor (DSP), microcontroller (micro controller unit, MCU), and programmable logic device (programmable logic device) PLD) or other integrated chips.

This embodiment of the present application further provides a storage medium, where the storage medium may include a memory 3902 .

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the medium. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like.

Although the application is described herein in conjunction with the various embodiments, those skilled in the art will understand and understand from a review of the drawings, the disclosure, and the appended claims in practicing the claimed application. Other variations of the disclosed embodiments are implemented. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that these measures cannot be combined to advantage.

Although the application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined by the appended claims, and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of this application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (40)

1. A method for indicating a demodulation reference signal, comprising: The transmitter obtains DMRS indication information according to the DMRS configuration information; the DMRS indication information indicates the code division multiplexing CDM group information of the antenna port, and the CDM group information includes the number of CDM groups; the number of CDM groups is the number of CDM groups in the system. The number of CDM groups that are not used for data transmission if they are occupied or scheduled; The transmitting end sends the DMRS indication information. 2. The method according to claim 1, wherein the transmitting end obtains the DMRS indication information according to the DMRS configuration information, comprising: The transmitting end determines the DMRS configuration information corresponding to the current DMRS transmission scheme from multiple sets of demodulation reference signal DMRS configuration information, and obtains the DMRS indication information according to the DMRS configuration information; each group of DMRS configuration information includes multiple DMRS configuration information. 3. The method according to claim 2, wherein when the value of the CDM group number information is 1, it indicates that CDM group 1 is occupied or scheduled, and when the value of the CDM group number information is 2, it indicates that the CDM group is 2 Group 1 and CDM group 2 are occupied or scheduled, and when the value of the CDM group number information is 3, it means that CDM group 1, CDM group 2, and CDM group 3 are occupied or scheduled. 4. The method according to claim 1, wherein the DMRS configuration information further comprises symbol information of the DMRS. 5. The method according to any one of claims 1 to 4, wherein, in the DMRS configuration information, the DMRS port mapping rules of DMRS type 1 and DMRS type 2 are as follows: For 1-symbol DMRS type 1, the ports included in CDM group 1 are {0,1}, and the ports included in CDM group 2 are {2,3}; For 2-symbol DMRS type 1, the ports included in CDM group 1 are {0,1,4,5}, and the ports included in CDM group 2 are {2,3,6,7}; For 1-symbol DMRS type 2, the ports included in CDM group 1 are {0,1}, the ports included in CDM group 2 are {2,3}, and the ports included in CDM group 3 are {4,5}; For 2-symbol DMRS type 2, the ports included in CDM group 1 are {0,1,6,7}, the ports included in CDM group 2 are {2,3,8,9}, and the ports included in CDM group 3 are {4 ,5,10,11}. 6. method as claimed in claim 5, is characterized in that, in the DMRS configuration information corresponding to described DMRS type 1, the correspondence between CDM group number, port, number of symbols satisfies one or more rows of the following table. The corresponding relationship shown: 7. method as claimed in claim 5 is characterized in that, in the DMRS configuration information corresponding to described DMRS type 2, the correspondence between CDM group number, port, number of symbols satisfies one or more rows of the following table. The corresponding relationship shown: 8. The method according to claim 1, wherein the usable range of the DMRS configuration information is configured through RRC signaling, and the usable range is determined based on symbol information of the DMRS or the maximum number of symbols of the DMRS . 9 . The method according to claim 1 , wherein the usable range of the DMRS configuration information is associated with a parameter indicating the maximum number of DMRS symbols in the radio resource control signaling RRC. 10 . 10. A transmitter, characterized in that, comprising: The processing unit obtains DMRS indication information according to the DMRS configuration information; the DMRS indication information indicates the code division multiplexing CDM group information of the antenna port, and the CDM group information includes the number of CDM groups; the number of CDM groups is the number of CDM groups in the system The number of CDM groups that are not used for data transmission if they are occupied or scheduled; A sending unit, to send the DMRS indication information. 11. The transmitting end according to claim 10, wherein the transmitting end obtains DMRS indication information according to DMRS configuration information, before comprising: The transmitting end determines the DMRS configuration information corresponding to the current DMRS transmission scheme from multiple sets of demodulation reference signal DMRS configuration information, and obtains the DMRS indication information according to the DMRS configuration information; each group of DMRS configuration information includes multiple DMRS configuration information. 12. The transmitter according to claim 10, wherein when the value of the CDM group number information is 1, it indicates that CDM group 1 is occupied or scheduled, and when the value of the CDM group number information is 2, it indicates that the CDM group is occupied or scheduled. CDM group 1 and CDM group 2 are occupied or scheduled, and when the value of the CDM group number information is 3, it means that CDM group 1, CDM group 2, and CDM group 3 are occupied or scheduled. 13. The transmitter according to claim 10, wherein the DMRS configuration information further comprises symbol information of the DMRS. 14. The transmitter according to any one of claims 10 to 13, wherein, in the DMRS configuration information, the DMRS port mapping rules of DMRS type 1 and DMRS type 2 are as follows: For 1-symbol DMRS type 1, the ports included in CDM group 1 are {0,1}, and the ports included in CDM group 2 are {2,3}; For 2-symbol DMRS type 1, the ports included in CDM group 1 are {0,1,4,5}, and the ports included in CDM group 2 are {2,3,6,7}; For 1-symbol DMRS type 2, the ports included in CDM group 1 are {0,1}, the ports included in CDM group 2 are {2,3}, and the ports included in CDM group 3 are {4,5}; For 2-symbol DMRS type 2, the ports included in CDM group 1 are {0,1,6,7}, the ports included in CDM group 2 are {2,3,8,9}, and the ports included in CDM group 3 are {4 ,5,10,11}. 15. The transmitter according to claim 14, wherein, in the DMRS configuration information corresponding to the DMRS type 1, the correspondence between the number of CDM groups, the port, and the number of symbols satisfies one or more rows of the following table The correspondence shown is: 16. The transmitting terminal of claim 14, wherein, in the DMRS configuration information corresponding to the DMRS type 2, the correspondence between the number of CDM groups, the port, and the number of symbols satisfies one or more rows of the following table The correspondence shown is: 17. The transmitter according to claim 10, wherein the usable range of the DMRS configuration information is configured through RRC signaling, and the usable range is determined based on DMRS symbol information or the maximum number of DMRS symbols of. 18. The transmitter according to claim 10, wherein the usable range of the DMRS configuration information is associated with a parameter indicating the maximum number of DMRS symbols in the radio resource control signaling RRC. 19. A method for receiving a demodulation reference signal, comprising: The receiving end receives the demodulation reference signal DMRS indication information sent by the transmitting end; the DMRS indication information indicates the code division multiplexing CDM group information of the antenna port, and the CDM group information includes the number of CDM groups; the number of CDM groups is The number of CDM groups that may be occupied or scheduled in the system and not used for data transmission; The receiving end assists in demodulating data according to the received DMRS indication information. 20. The method according to claim 19, wherein the DMRS indication information is that the transmitter determines the DMRS configuration information corresponding to the current DMRS transmission scheme from multiple sets of demodulation reference signal DMRS configuration information, and determines the DMRS configuration information corresponding to the current DMRS transmission scheme according to the DMRS configuration information. The configuration information obtains DMRS indication information; each group of DMRS configuration information includes multiple pieces of DMRS configuration information. 21. The method of claim 19, wherein when the value of the CDM group number information is 1, it indicates that CDM group 1 is occupied or scheduled, and when the value of the CDM group number information is 2, it indicates that the CDM group is occupied or scheduled. Group 1 and CDM group 2 are occupied or scheduled, and when the value of the CDM group number information is 3, it means that CDM group 1, CDM group 2, and CDM group 3 are occupied or scheduled. 22. The method of claim 19, wherein the DMRS configuration information further comprises symbol information of the DMRS. 23. The method according to any one of claims 19 to 22, wherein, in the DMRS configuration information, the specific DMRS port mapping rules of DMRS type 1 and DMRS type 2 are as follows: For 1-symbol DMRS type 1, the ports included in CDM group 1 are {0,1}, and the ports included in CDM group 2 are {2,3}; For 2-symbol DMRS type 1, the ports included in CDM group 1 are {0,1,4,5}, and the ports included in CDM group 2 are {2,3,6,7}; For 1-symbol DMRS type 2, the ports included in CDM group 1 are {0,1}, the ports included in CDM group 2 are {2,3}, and the ports included in CDM group 3 are {4,5}; For 2-symbol DMRS type 2, the ports included in CDM group 1 are {0,1,6,7}, the ports included in CDM group 2 are {2,3,8,9}, and the ports included in CDM group 3 are {4 ,5,10,11}. 24. The method of claim 23, wherein, in the DMRS configuration information corresponding to the DMRS type 1, the correspondence between the number of CDM groups, the port, and the number of symbols satisfies one or more rows of the following table. The corresponding relationship shown: 25. The method of claim 23, wherein, in the DMRS configuration information corresponding to the DMRS type 2, the correspondence between the number of CDM groups, the port, and the number of symbols satisfies one or more rows of the following table. The corresponding relationship shown: 26. The method of claim 19, wherein the usable range of the DMRS configuration information is configured through RRC signaling, and the usable range is determined based on DMRS symbol information or the maximum number of DMRS symbols . 27. The method of claim 19, wherein the usable range of the DMRS configuration information is associated with a parameter in the radio resource control signaling RRC indicating the maximum number of DMRS symbols. 28. A receiving end, characterized in that, comprising: a receiving unit, configured to receive the DMRS indication information of the demodulation reference signal sent by the transmitting end; the DMRS indication information indicates the code division multiplexing CDM group information of the antenna port, and the CDM group information includes the number of CDM groups ; The number of CDM groups is the number of CDM groups that may be occupied or scheduled in the system and not used for data transmission; A processing unit for assisting in demodulating data according to the DMRS indication information received by the receiving unit. 29. The receiver according to claim 28, wherein the DMRS indication information is that the transmitter determines DMRS configuration information corresponding to the current DMRS transmission scheme from multiple sets of demodulation reference signal DMRS configuration information, and The DMRS indication information is obtained according to the DMRS configuration information; each group of DMRS configuration information includes multiple pieces of DMRS configuration information. 30. The receiver according to claim 28, wherein when the value of the CDM group number information is 1, it indicates that CDM group 1 is occupied or scheduled, and when the value of the CDM group number information is 2, it indicates that the CDM group is occupied or scheduled. CDM group 1 and CDM group 2 are occupied or scheduled, and when the value of the CDM group number information is 3, it means that CDM group 1, CDM group 2, and CDM group 3 are occupied or scheduled. 31. The receiver according to claim 28, wherein the DMRS configuration information further comprises symbol information of the DMRS. 32. The receiver according to any one of claims 28 to 31, wherein, in the DMRS configuration information, the specific DMRS port mapping rules of DMRS type 1 and DMRS type 2 are as follows: For 1-symbol DMRS type 1, the ports included in CDM group 1 are {0,1}, and the ports included in CDM group 2 are {2,3}; For 2-symbol DMRS type 1, the ports included in CDM group 1 are {0,1,4,5}, and the ports included in CDM group 2 are {2,3,6,7}; For 1-symbol DMRS type 2, the ports included in CDM group 1 are {0,1}, the ports included in CDM group 2 are {2,3}, and the ports included in CDM group 3 are {4,5}; For 2-symbol DMRS type 2, the ports included in CDM group 1 are {0,1,6,7}, the ports included in CDM group 2 are {2,3,8,9}, and the ports included in CDM group 3 are {4 ,5,10,11}. 33. The receiving terminal of claim 32, wherein in the DMRS configuration information corresponding to the DMRS type 1, the correspondence between the number of CDM groups, the port, and the number of symbols satisfies one or more rows of the following table The correspondence shown is: 34. receiving terminal as claimed in claim 32, is characterized in that, in the DMRS configuration information corresponding to described DMRS type 2, the correspondence between CDM group number, port, number of symbols satisfies one or more rows of the following table The correspondence shown is: 35. The receiving end according to claim 28, wherein the usable range of the DMRS configuration information is configured by RRC signaling, and the usable range is determined based on the symbol information of the DMRS or the maximum number of symbols of the DMRS of. 36. The receiver according to claim 28, wherein the usable range of the DMRS configuration information is associated with a parameter in the radio resource control signaling RRC indicating the maximum number of DMRS symbols. 37. A chip, comprising a processing unit and an interface; The processing unit is the processing unit in the transmitter according to any one of claims 10 to 18 or the processing unit in the receiver according to any one of claims 28 to 36 . 38. A communication system, characterized in that it comprises: The transmitter according to any one of claims 10-18 and the receiver according to any one of claims 28-36. 39. A computer storage medium for storing computer software instructions used by the transmitter according to any one of claims 10 to 18. 40. A computer storage medium for storing computer software instructions used by the receiver according to any one of claims 28 to 36.