CN115484133A - Method and device for indicating demodulation reference signal - Google Patents

Abstract

The application provides a method for indicating demodulation reference signals, which comprises the following steps: the terminal equipment receives first indication information, wherein the first indication information is used for determining the configuration of a demodulation reference signal (DMRS), the configuration of the DMRS comprises time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols; the terminal equipment receives second indication information, wherein the second indication information is used for determining a first DMRS used for channel estimation in the DMRS, the first DMRS occupies L symbols, and L is smaller than K; the terminal equipment determines the time-frequency resource of the first DMRS according to the first indication information and the second indication information; and the terminal equipment carries out channel estimation by using the first DMRS, wherein K is an integer larger than 1, and L is an integer larger than 0. In the method and the device, the terminal equipment can adopt part of DMRS for channel estimation, and the number of orthogonal DMRS ports is increased, so that the performance of the system is guaranteed.

Description

Method and device for indicating demodulation reference signal

Technical Field

The present application relates to the field of communications, and more particularly, to a method and apparatus for indicating a demodulation reference signal.

Background

In the 5G communication system, with the rapid development of mobile communication, there are higher requirements in many aspects such as system capacity, instantaneous peak rate, spectrum efficiency, cell edge user throughput, and delay. In the system, coordinated multiple points (CoMP) is a method for improving resource utilization and reducing inter-cell interference level. The multi-station cooperative transmission technology includes cooperative beam-forming (coordinated beam-forming), coordinated scheduling (coordinated scheduling), joint transmission (joint transmission), dynamic transmission point selection (dynamic point selection), dynamic transmission point muting (dynamic point muting), and other technologies. The base stations can interact through backhaul, air interfaces and other ways, and coordinate to transmit the required information. By the transmission methods, the interference to edge users can be reduced, and the performance of the system can be improved.

Currently, a transmission mode of multi-station cooperation is usually adopted to improve the throughput of the system, and at this time, the system can schedule more data streams. However, the maximum port number of the demodulation reference signal (DMRS) is only 12, and the port number of the DMRS is a bottleneck affecting system performance.

Disclosure of Invention

The application provides a method and a device for indicating demodulation reference signals, which increase the number of orthogonal DMRS ports and ensure the performance of a system.

In a first aspect, a method for indicating a demodulation reference signal is provided, the method including: the terminal equipment receives first indication information from network equipment, wherein the first indication information is used for determining the configuration of a demodulation reference signal (DMRS), the configuration of the DMRS comprises time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols; the terminal equipment receives second indication information from the network equipment, wherein the second indication information is used for determining a first DMRS used for channel estimation in the DMRS, the first DMRS occupies L symbols, and L is smaller than K; the terminal equipment determines the time-frequency resource of the first DMRS according to the first indication information and the second indication information; and the terminal equipment carries out channel estimation by using the first DMRS, wherein K is an integer larger than 1, and L is an integer larger than 0.

Based on the technical scheme, in the application, the terminal equipment can adopt part of DMRS for channel estimation, and compared with the prior art that the terminal equipment adopts all DMRSs, for example, the front DMRS and the additional DMRS are adopted for channel estimation at the same time, the technical scheme of the application increases the number of orthogonal DMRS ports and guarantees the performance of the system.

It should be noted that, in the present application, the DMRS configuration may be understood as various time-frequency resource configurations and symbol type configurations of a DMRS (or a DMRS to be transmitted) to be transmitted by a network device. For example, the symbols occupied by the DMRS, the port information of the DMRS, whether the DMRS is a single symbol or a dual symbol, and the like are configured. It should be understood that, in the present application, which symbols are ultimately used by the terminal device for channel estimation (i.e., the first DMRS) or which symbols are ultimately used by the terminal device for channel estimation (i.e., the first DMRS) needs to be determined according to the second indication information.

It should be noted that, in this application, the first DMRS is a part of DMRS in a DMRS configured by a network device to a terminal, and it may also be understood that a symbol occupied by the first DMRS in this application may be a part of DMRS symbols configured by the network device to the terminal device. In other words, in the present application, the network device may transmit the DMRS (i.e., the first DMRS) on the partial symbol, and the terminal device may perform channel estimation based on the DMRS (i.e., the first DMRS) on the partial symbol.

With reference to the first aspect, in certain embodiments of the first aspect, the DMRS includes a preamble DMRS and at least one additional DMRS, and the second indication information is used to determine a first DMRS of the DMRS for channel estimation, and includes: the second indication information is specifically used for determining the type of the first DMRS, and the type of the first DMRS at least includes one of the following items: a preamble DMRS type, an additional DMRS type.

Based on the above technical solution, in the present application, the terminal device may perform channel estimation only by using the pre-DMRS (it may also be understood that the first DMRS is the pre-DMRS), or the terminal device may perform channel estimation only by using the additional DMRS (it may also be understood that the first DMRS is the additional DMRS), so that the number of orthogonal DMRS ports is increased, and the performance of the system is guaranteed.

With reference to the first aspect, in certain embodiments of the first aspect, wherein the preamble DMRS type includes a first type and a second type, and the first type is: the preamble DMRS is the first DMRS, neither the preamble DMRS nor the additional DMRS transmits data, and the second type is: the preamble DMRS is the first DMRS, the preamble DMRS does not transmit data, and the additional DMRS is used for transmitting data.

Based on the above technical solution, in the present application, it is considered that under the condition that there are many cell users and all of them need channel estimation, neither the pre-DMRS nor the additional DMRS may transmit data, at this time, other users may use the additional DMRS for channel estimation, and the number of orthogonal DMRS ports is increased, so that the system may support more data streams, and ensure the performance of the system, and the channel estimation of the orthogonal DMRS ports may reduce interference between users, so that the channel estimation is more accurate. Or, when there are few cell users and there are not many channel estimation users, the pre-DMRS does not transmit data, and the additional DMRS may be used to transmit data.

With reference to the first aspect, in certain embodiments of the first aspect, the configuration of the DMRS further includes symbols occupied by the DMRS, and the second indication information is used to determine a first DMRS used for channel estimation in the DMRS, including: the second indication information is specifically used for determining a configuration of symbols occupied by the first DMRS.

Based on the above technical solution, in the present application, the DMRS used for channel estimation may be determined more flexibly by indicating the symbol of the first DMRS.

With reference to the first aspect, in certain embodiments of the first aspect, the DMRS is a single-symbol DMRS, the first indication information is used to determine a configuration of a symbol Y of the DMRS, where when Y is equal to 4, the number of bits N of the second indication information is equal to 4, N bits of the second indication information correspond to Y symbols of the DMRS in a one-to-one manner, and an ith symbol corresponding to a bit value of an ith bit of the N bits is used to indicate whether the corresponding DMRS on the ith symbol belongs to the first DMRS, where 1 ≦ i ≦ 4.

Assuming that the bits of the second indication information are 1100, the symbols configuring the DMRS are: symbol 2, symbol 5, symbol 8, and symbol 11. At this time, it means that the first DMRS is composed of DMRSs on symbol 2 and symbol 5 in common. In this application, whether the DMRS corresponding to the ith symbol belongs to the first DMRS may be understood as that the DMRS corresponding to the ith symbol is one of the first DMRSs. In this application, the symbols corresponding to the first DMRS may be regarded as a set J, where the set J includes elements such as { J1, J2, J3 \8230; jn }, and DMRSs corresponding to each symbol in the set jointly form the first DMRS, for example, i in this application may belong to a J set, that is, i may be one element in the J set. In particular, when only a DMRS on one symbol is used for channel estimation, the DMRS on the symbol is the first DMRS. It should be noted that, in some embodiments, in each symbol in the first DMRS, a bit is 1. Of course, it may also be specified that the bit on each symbol in the first DMRS is 0. The first DMRS is indicated by "0" or "1" in the bit value, which is not limited in the present application.

Based on the above technical solution, in the present application, for a single-symbol DMRS, the first DMRS may be flexibly indicated by 4 bits, for example, the terminal device only uses the front DMRS for signaling estimation, the terminal device only uses the additional DMRS for channel estimation, and the terminal device uses part of the additional DMRS for channel estimation, or the terminal device uses the front DMRS and part of the additional DMRS for channel estimation, which not only increases the number of orthogonal DMRS ports, guarantees the performance of the system, but also reduces signaling overhead.

With reference to the first aspect, in certain embodiments of the first aspect, if the bit value of the ith bit corresponding to the ith symbol indicates that the DMRS corresponding to the ith symbol is not the first DMRS, the terminal device defaults that neither the DMRS nor data is transmitted on the ith symbol.

Based on the above technical solutions, in the present application, under the condition that a plurality of cell users are considered and all of the cell users need channel estimation, if the DMRSs on some symbols are not used for channel estimation, neither the DMRSs nor data is transmitted on the symbols at this time. At this time, other users may perform channel estimation using the DMRS on the symbol, thereby increasing the number of orthogonal DMRS ports and reducing interference between users.

With reference to the first aspect, in certain embodiments of the first aspect, the DMRS is a single-symbol DMRS, the first indication information is used to determine a configuration of a symbol Y of the DMRS, where when Y is less than 4, the number of bits N of the second indication information is equal to 4, first Y bits of the N bits are in one-to-one correspondence with Y symbols of the DMRS, and first Y bits of the N bits are used to indicate whether a corresponding DMRS on Y symbols belongs to the first DMRS.

Based on the technical scheme, if the configured DMRS symbol is less than 4, the first DMRS can still be flexibly indicated through 4 bits, so that the number of orthogonal DMRS ports is increased, the performance of a system is guaranteed, and the signaling overhead is reduced.

With reference to the first aspect, in certain embodiments of the first aspect, if a bit value of a jth bit corresponding to a jth symbol of the Y symbols indicates that the DMRS corresponding to the jth symbol does not belong to the first DMRS, a last bit of the N bits is used to indicate whether data is transmitted on the jth symbol, where Y is an integer greater than 0.

Based on the above technical solution, in the present application, under the condition that there are few cell users and there are not many channel estimation users, if the DMRSs on part of the symbols are not used for channel estimation, data can also be transmitted, thereby fully utilizing system resources.

With reference to the first aspect, in certain embodiments of the first aspect, the DMRS is a dual-symbol DMRS, the first indication information is used to determine a configuration of a dual-symbol X of the DMRS, when the X is equal to 2, bits Z of the second indication information are equal to 2, Z bits of the second indication information correspond to X symbols of the DMRS in a one-to-one manner, and a bit value of an r-th bit corresponding to an r-th symbol is used to indicate whether the corresponding DMRS on the r-th symbol belongs to the first DMRS, where r is greater than or equal to 1 and less than or equal to 2.

Based on the technical scheme, in the application, for the dual-symbol DMRS, the first DMRS can be flexibly indicated through 2 bits, so that the number of orthogonal DMRS ports is increased, the performance of a system is guaranteed, and the signaling overhead is reduced.

With reference to the first aspect, in certain embodiments of the first aspect, if the bit value of the r-th bit corresponding to the r-th symbol indicates that the DMRS corresponding to the r-th symbol is not the first DMRS, the terminal device defaults that neither the DMRS nor data is transmitted on the r-th symbol.

With reference to the first aspect, in certain embodiments of the first aspect, the method further comprises: and the terminal equipment determines time-frequency resources of transmitted data according to the first indication information and the second indication information, wherein the time-frequency resources of the data do not comprise the pre-DMRS time-frequency resources on the physical downlink shared channel.

Based on the above technical solution, in the present application, the terminal device may flexibly determine the position of the time-frequency resource of the transmitted data according to the indication of the second indication information, so as to perform decoding.

With reference to the first aspect, in certain embodiments of the first aspect, the configuration of the DMRS includes at least one of: the method comprises the steps of configuring the symbol type of the DMRS, configuring the time-frequency resource of the preposed DMRS and configuring the time-frequency resource of the additional DMRS.

Based on the above technical solution, in the present application, the terminal device may determine the location of the time-frequency resource of the first DMRS according to the configuration of the DMRS.

In a second aspect, a method for indicating a demodulation reference signal is provided, the method including: the method comprises the steps that network equipment sends first indication information to terminal equipment, wherein the first indication information is used for determining the configuration of a demodulation reference signal (DMRS), the configuration of the DMRS comprises time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols; and the network equipment terminal equipment sends second indication information, wherein the second indication information is used for determining a first DMRS used for channel estimation in the DMRS, the first DMRS occupies L symbols, L is smaller than K, K is an integer larger than 1, and L is an integer larger than 0.

Based on the technical scheme, the network equipment sends the indication information to the terminal equipment to indicate that the terminal equipment can adopt part of DMRS to carry out channel estimation, so that the number of orthogonal DMRS ports is increased, and the performance of a system is guaranteed.

With reference to the second aspect, in certain embodiments of the second aspect, the DMRS includes a preamble DMRS and at least one additional DMRS, and the second indication information is used to determine a first one of the DMRSs to use for channel estimation, and includes: the second indication information is specifically used for determining the type of the first DMRS, and the type of the first DMRS at least includes one of the following items: a preamble DMRS type, an additional DMRS type.

Based on the above technical solution, in the present application, the network device may instruct the terminal device to perform channel estimation only using the pre-DMRS (it may also be understood that the first DMRS is the pre-DMRS), or instruct the terminal device to perform channel estimation only using the additional DMRS (it may also be understood that the first DMRS is the additional DMRS), so that the number of orthogonal DMRS ports is increased, and the performance of the system is guaranteed.

With reference to the second aspect, in certain embodiments of the second aspect, wherein the preamble DMRS type includes a first type and a second type, the first type being: the pre-DMRS is the first DMRS, neither the pre-DMRS nor the additional DMRS transmits data, and the second type is: the pre-DMRS is the first DMRS, the pre-DMRS transmits no data, and the additional DMRS is used to transmit data.

Based on the technical scheme, in the application, under the condition that a plurality of cell users all need channel estimation, the front DMRS and the additional DMRS do not transmit data, and at the moment, other users can utilize the additional DMRS to carry out channel estimation, so that the number of orthogonal DMRS ports is increased, the performance of a system is ensured, and the interference among the users can be reduced. Or, when there are few cell users and not many channel estimation users, the pre-DMRS does not transmit data, and the additional DMRS may be used to transmit data.

With reference to the second aspect, in certain embodiments of the second aspect, the configuration of the DMRS further includes symbols occupied by the DMRS, and the second indication information is used to determine a first DMRS used for channel estimation in the DMRS, and includes: the second indication information is specifically used for determining a configuration of symbols occupied by the first DMRS.

Based on the above technical solution, in the present application, the network device may determine the DMRS used for channel estimation more flexibly by indicating the symbol of the first DMRS.

With reference to the second aspect, in certain embodiments of the second aspect, the DMRS is a single-symbol DMRS, the first indication information is used to determine a configuration of a symbol Y of the DMRS, where when the Y is equal to 4, the number of bits N of the second indication information is equal to 4, N bits of the second indication information correspond to Y symbols of the DMRS in a one-to-one manner, and an ith symbol corresponding to a bit value of an ith bit of the N bits is used to indicate whether the corresponding DMRS on the ith symbol belongs to the first DMRS, where 1 ≦ i ≦ 4.

Based on the above technical solution, in the present application, for a single-symbol DMRS, a network device may flexibly indicate a first DMRS through 4 bits, for example, the network device indicates that a terminal device only uses a pre-DMRS for signaling estimation, the network device indicates that the terminal device only uses an additional DMRS for channel estimation, and the network device indicates that the terminal device uses a part of the additional DMRS for channel estimation, or the network device indicates that the terminal device uses the pre-DMRS and the part of the additional DMRS for channel estimation, which not only increases the number of orthogonal DMRS ports, guarantees the performance of the system, but also reduces signaling overhead.

With reference to the second aspect, in certain embodiments of the second aspect, if the bit value of the ith bit corresponding to the ith symbol indicates that the DMRS corresponding to the ith symbol is not the first DMRS, the terminal device defaults that neither the DMRS nor data is transmitted on the ith symbol.

Based on the above technical solution, in the present application, under the condition that a lot of cell users are considered and channel estimation is needed, if DMRSs on some symbols do not perform channel estimation, at this time, DMRSs and data are not transmitted on the symbols. At this time, other users may perform channel estimation using DMRSs on the symbol, thereby increasing the number of orthogonal DMRS ports and reducing interference between users.

With reference to the second aspect, in certain embodiments of the second aspect, the DMRS is a single-symbol DMRS, the first indication information is used to determine a configuration of symbols Y of the DMRS, and when Y is less than 4, the number of bits N of the second indication information is equal to 4, the first Y bits of the N bits correspond to Y symbols of the DMRS in a one-to-one manner, and the first Y bits of the N bits are used to indicate whether the corresponding DMRS on the Y symbols belongs to the first DMRS.

Based on the technical scheme, in the application, if the configured DMRS symbol is less than 4, the network device may still flexibly indicate the first DMRS through 4 bits, which not only increases the number of orthogonal DMRS ports, guarantees the performance of the system, but also reduces the signaling overhead.

With reference to the second aspect, in certain embodiments of the second aspect, if a bit value of a jth bit corresponding to a jth symbol of the Y symbols indicates that the DMRS corresponding to the jth symbol does not belong to the first DMRS, a last bit of the N bits is used to indicate whether data is transmitted on the jth symbol, wherein Y is an integer greater than 0.

Based on the above technical solution, in the present application, under the condition that there are few cell users and there are not many channel estimation users, if the DMRSs on part of the symbols are not used for channel estimation, data can also be transmitted, thereby fully utilizing system resources.

With reference to the second aspect, in certain embodiments of the second aspect, the DMRS is a dual-symbol DMRS, the first indication information is used to determine a configuration of a dual-symbol X of the DMRS, when the X is equal to 2, bits Z of the second indication information are equal to 2, Z bits of the second indication information are in one-to-one correspondence with X symbols of the DMRS, and a bit value of an r-th bit corresponding to an r-th symbol is used to indicate whether the corresponding DMRS on the r-th symbol belongs to the first DMRS, where 1 ≦ r ≦ 2.

Based on the technical scheme, in the application, for the dual-symbol DMRS, the network device can flexibly indicate the first DMRS through 2 bits, so that the number of orthogonal DMRS ports is increased, the performance of a system is guaranteed, and the signaling overhead is reduced.

With reference to the second aspect, in some embodiments of the second aspect, the terminal device defaults to no DMRS nor data being transmitted on the r-th symbol if the bit value of the r-th bit corresponding to the r-th symbol indicates that the DMRS corresponding to the r-th symbol is not the first DMRS.

With reference to the second aspect, in certain embodiments of the second aspect, the method further comprises: the network equipment determines time-frequency resources of transmitted data, wherein the time-frequency resources of the data do not comprise the preposed DMRS time-frequency resources on a physical downlink shared channel; and the network equipment sends the data on the physical downlink shared channel.

Based on the technical scheme, the network equipment can flexibly determine the position of the time-frequency resource of the transmitted data.

With reference to the second aspect, in certain embodiments of the second aspect, the configuration of the DMRS includes at least one of: the method comprises the steps of configuring the symbol type of the DMRS, configuring the time-frequency resource of the preposed DMRS and configuring the time-frequency resource of the additional DMRS.

Based on the above technical solution, in the present application, the terminal device may determine the position of the time-frequency resource of the first DMRS according to the configuration of the DMRS.

In a third aspect, a communication device is provided that includes means for performing the method of the first aspect or any one of the possible implementations of the first aspect.

In a fourth aspect, a communication device is provided that comprises means for performing the method of the second aspect or any one of the possible implementations of the second aspect.

In a fifth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute instructions in the memory to implement the method of any one of the possible implementations of the first aspect. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the apparatus is a terminal device. When the apparatus is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the apparatus is a chip configured in a terminal device. When the apparatus is a chip configured in a terminal device, the communication interface may be an input/output interface.

In one implementation, the apparatus is a host node device. When the apparatus is a host node device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the apparatus is a chip configured in a host node. When the apparatus is a chip configured in a host node, the communication interface may be an input/output interface. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In a sixth aspect, an apparatus for indicating a demodulation reference signal is provided and includes a processor. The processor is coupled to the memory and is operable to execute the instructions in the memory to implement the method of any one of the possible implementations of the second aspect. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the apparatus is a network device. When the apparatus is a network device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the apparatus is a chip configured in a network device. When the apparatus is a chip configured in a network device, the communication interface may be an input/output interface.

In one implementation, the apparatus is a host node device. When the apparatus is a host node device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the apparatus is a chip configured in a host node device. When the apparatus is a chip configured in a host node device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In a seventh aspect, a processor is provided, including: input circuit, output circuit and processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor performs the method of any one of the possible implementations of the first aspect and the second aspect.

In a specific implementation process, the processor may be one or more chips, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example, but not limited to, a transceiver, the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times. The embodiment of the present application does not limit the specific implementation manner of the processor and various circuits.

In an eighth aspect, a processing apparatus is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory and to receive signals via the transceiver and transmit signals via the transmitter to perform the method of any of the possible implementations of the first and second aspects.

Optionally, the number of the processors is one or more, and the number of the memories is one or more.

Alternatively, the memory may be integral to the processor or provided separately from the processor.

In a specific implementation process, the memory may be a non-transitory (non-transitory) memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips, and the embodiment of the present application does not limit the type of the memory and the arrangement manner of the memory and the processor.

It will be appreciated that the associated data interaction process, for example, sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, data output by the processor may be output to the transmitter and input data received by the processor may be from the transceiver. The transmitter and the transceiver may be collectively referred to as a transceiver, among others.

The processing means in the above-mentioned eighth aspect may be one or more chips. The processor in the processing device may be implemented by hardware or may be implemented by software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

In a ninth aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes a computer to perform the method of any one of the possible implementations of the first and second aspects described above.

In a tenth aspect, a computer-readable medium is provided, which stores a computer program (which may also be referred to as code, or instructions), which when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first and second aspects described above.

In an eleventh aspect, a chip system is provided, which includes a processor, and is configured to invoke and run a computer program from a memory, so that a device in which the chip system is installed executes the method in each implementation manner of the first aspect and the second aspect.

In a twelfth aspect, a communication system is provided, which includes the apparatus of the third aspect and the apparatus of the fourth aspect.

Drawings

Fig. 1 is a schematic view of a scenario in which the present application is applicable.

Fig. 2 is a schematic diagram of a system architecture to which the present application is applicable.

Fig. 3 is a schematic diagram of time-frequency resources of demodulation reference signals provided in the present application.

Fig. 4 is a schematic flow chart of a method for indicating demodulation reference signals provided by the present application.

Fig. 5 is a schematic flow chart of a method for indicating a demodulation reference signal provided in the present application.

Fig. 6 is another schematic diagram of time-frequency resources of demodulation reference signals provided in the present application.

Fig. 7 is a schematic flow chart diagram of a method for indicating demodulation reference signals provided by the present application.

Fig. 8 is another schematic diagram of time-frequency resources of a demodulation reference signal provided in the present application.

Fig. 9 is another schematic diagram of time-frequency resources of demodulation reference signals provided in the present application.

Fig. 10 is a schematic block diagram of a communication device provided herein.

Fig. 11 is a schematic block diagram of a communication device provided herein.

Fig. 12 is a schematic diagram of a network device provided in the present application.

Fig. 13 is a schematic diagram of a terminal device provided in the present application.

Detailed Description

The wireless communication system to which the embodiments of the present application can be applied includes, but is not limited to: a global system for mobile communications (GSM) system, a Long Term Evolution (LTE) Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD) system, an LTE-Advanced (LTE-a) system, a next generation communication system (e.g., a 5G, 6G communication system), a convergence system of multiple access systems, or an evolution system.

The technical scheme provided by the application can also be applied to Machine Type Communication (MTC), long Term Evolution-machine (LTE-M) communication between machines, device to device (D2D) network, machine to machine (M2M) network, internet of things (IoT) network, or other networks. The IoT network may comprise, for example, a car networking network. The communication modes in the car networking system are generally referred to as car to other devices (vehicle to X, V2X, X may represent anything), for example, the V2X may include: vehicle to vehicle (V2V) communication, vehicle to infrastructure (V2I) communication, vehicle to pedestrian (V2P) or vehicle to network (V2N) communication, and the like.

The terminal equipment related in the embodiment of the application is an entrance for interaction between a mobile user and a network, and can provide basic computing capacity and storage capacity, display a service window for the user and receive operation input of the user. The terminal equipment in 5G may adopt a new air interface technology to establish signal connection and data connection with the wireless access network equipment, thereby transmitting control signals and service data to the mobile network. The terminal devices referred to in the embodiments of the present application may include various access terminals, mobile devices, user terminals or user apparatuses having wireless communication functions. For example, the terminal device may be a User Equipment (UE), such as a mobile phone (mobile phone), a tablet computer (pad), a desktop computer, a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, a television, an Augmented Reality (AR) terminal device, and the like. The terminal device may also be a wireless terminal in industrial control (industrial control), a Machine Type Communication (MTC) terminal, a Customer Premises Equipment (CPE), a wireless terminal in self-driving (self-driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid, a wireless terminal in transportation security, a wireless terminal in smart city, a smart home, a smart speaker, an electronic door lock, a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol), SIP) phones, wireless Local Loop (WLL) stations, personal Digital Assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, automated Guided Vehicles (AGVs), drones, cars, vehicle mounted devices, wearable devices, terminal devices in a 5G network or terminal devices in a future evolved Public Land Mobile Network (PLMN) or non-public network (NPN), etc.

The wireless access network equipment related in the embodiment of the application is similar to a base station in a traditional network, is deployed at a position close to the terminal equipment, provides a network access function for authorized users in a specific area, and can determine transmission tunnels with different qualities according to the grade of the users, the service requirements and the like to transmit user data. The radio access network equipment can manage the resources of the radio access network equipment, reasonably utilize the resources, provide access service for the terminal equipment according to needs, and is responsible for forwarding control signals and user data between the terminal equipment and a core network. The radio access network device involved in the embodiments of the present application may be an access device that the terminal device accesses to the mobile communication system in a wireless manner. The radio access network device may be: a base station, an evolved node B (eNB), a home base station, an Access Point (AP) in a wireless fidelity (WiFi) system, a Station (STA), a wireless relay node, a wireless backhaul node, a Transmission Point (TP) or a Transmission and Reception Point (TRP), a macro base station or a micro base station, a high frequency base station, and the like. The Radio Access Network device may also be a next generation base station (gNB) in the NR system, or may also be a component or a part of a device constituting the base station, such as a Central Unit (CU), a Distributed Unit (DU), or a baseband unit (BBU), or a Radio controller in a Cloud Radio Access Network (CRAN) scenario. It should be understood that, in the embodiments of the present application, there is no limitation on the specific technology and the specific device form adopted by the radio access network device. In this application, a radio access network device is referred to as a network device for short, and if no special description is provided, network devices are referred to as radio access network devices in this application. In this application, the network device may refer to the network device itself, or may be a chip applied to the network device to complete a wireless communication processing function.

For example, the embodiments of the present application may be applied to a 5G network, and may also be applied to other scenarios such as a wireless communication network that may adopt uplink precoding indication. In the present application, a communication process may occur between a network device and a terminal device. The following describes a scenario in which the embodiment of the present application is applied in detail with reference to fig. 1.

As shown in fig. 1, a network device is taken as a Base Station (BS), and a terminal device is taken as a User Equipment (UE) for example. In fig. 1, a base station and UE #1 to UE #6 constitute one communication system. In this communication system, UE #1 to UE #6 can transmit uplink data to the base station, and the base station can receive the uplink data transmitted by UE #1 to UE #6. The base station may transmit data to UE #1 to UE #6, and UE #1 to UE #6 may receive the data transmitted by the base station. Further, UE #4 to UE #6 may constitute one communication system. In this communication system, the base station may transmit downlink information to UE #1, UE #2, UE #5, and the like, and UE #5 may transmit downlink information to UE #4, UE #6.

Fig. 2 is a schematic diagram of a system architecture to which the present application is applicable. Similarly, a network device is taken as a base station, and a terminal device is taken as a user device for example. The base station and the user equipment may include but are not limited to: a Radio Resource Control (RRC) signaling interworking module, a media access control-control element (MAC-CE) signaling interworking module, and a Physical layer (Physical layer) signaling interworking module. The RRC signaling interaction module may be a module used by the base station and the UE to send and receive RRC signaling. The MAC signaling interaction module may be a module used by the base station and the UE to send and receive MAC-CE signaling. The PHY signaling and data exchanging module may be a module used by the base station and the UE to send and receive uplink or downlink control signaling, such as a Physical Uplink Control Channel (PUCCH), a Physical Downlink Control Channel (PDCCH), and uplink or downlink data, such as a Physical Uplink Shared Channel (PUSCH), a Physical Downlink Shared Channel (PDSCH).

For ease of understanding, the present application first briefly introduces a demodulation reference signal (DMRS).

In 5G, DMRSs are widely present in various important physical channels, and the most important role of DMRSs is to perform coherent demodulation and serve for demodulation of various physical channels. In the existing 3GPP protocol of the New Radio (NR), the maximum number of ports (ports) of orthogonal demodulation reference signals (DMRSs) that can be configured by one cell for data decoding is 12. In the NR system, a single-symbol DMRS (single-symbol DMRS) and a double-symbol DMRS (double-symbol DMRS) are included. Fig. 3 is a schematic diagram of time-frequency resources for single-symbol DMRSs and dual-symbol DMRSs. As shown in fig. 3 (a), a single symbol DMRS may have two sets of comb-shaped frequency-division resources, and may support up to 4 ports (e.g., port 0, port 1, port 2, port 3). The number of orthogonal code (OCC) for the single-symbol DMRS is 2, and 1 symbol is occupied. As shown in (b) of fig. 3, the DMRS of two symbols, supports a maximum of 8 ports (e.g., port 0, port 1, port 2, port 3, port 4, port 5, port 6, port 7), and each symbol may support 4 ports. The number of superposed orthogonal codes of the dual-symbol DMRS is 4, and two consecutive symbols are occupied. When maxLength is not configured or maxLength = len1 is configured in the DMRS configuration of RRC signaling, the DMRS is a single-symbol DMRS; when maxLength = len2 in the DMRS configuration of the RRC signaling, it may be determined whether the DMRS is a single-symbol DMRS or a dual-symbol DMRS according to an indication in Downlink Control Information (DCI). The above introduces time-frequency resource configuration of DMRS Type1 (Type 1) single symbol and dual symbol. It should be understood that the technical solution of the present application is equally applicable to DMRS Type2 (Type 2), and for brevity, the description of DMRS Type2 is omitted here.

In the NR system, there are two DMRS designs, i.e., a front-load DMRS (front-load DMRS) and an additional DMRS (additional DMRS), which are described below.

A pre-DMRS: in order to reduce demodulation and decoding time delay, the DMRS in the 5G NR system adopts a preamble design. The location where the DMRS first appears should be as close as possible to the start point of scheduling in each scheduling time unit. For example, in slot-based scheduled transmission (Type a), the location of the preamble DMRS should be immediately after the PDCCH region. The first symbol of the DMRS at this time depends on the configuration of the PDCCH, e.g., if the PDCCH occupies 2 symbols, the DMRS may start with the 3 rd symbol; if the PDCCH occupies 3 symbols, the DMRS may start from the 4 th symbol. In non-slot based scheduled transmission (scheduling unit less than 1 slot) (TypeB), the preamble DMRS may be transmitted from the first symbol of the scheduling region. The use of the pre-DMRS is beneficial to a receiving end to quickly estimate a channel and carry out receiving detection, and has important functions of reducing time delay and supporting a self-contained frame structure.

Addition of DMRS: for a low mobility scenario, the preamble DMRS can obtain channel estimation performance meeting demodulation requirements with low overhead. However, the mobile speed considered by the 5G NR system can reach up to 500km/h, and in the case of mobility with such a large dynamic range, in addition to the pre-DMRS, in a medium-high speed scenario, more DMRS symbols need to be inserted within a scheduling duration to meet the estimation accuracy of channel time-varying. Aiming at the problem, a DMRS structure combining a front DMRS and an additional DMR with configurable time domain density is adopted in the 5G NR system. The pattern of each group of the additional DMRS pilot is the repetition of the preamble DMRS pilot, namely, each group of the additional DMRS and the preamble DMRS pilot occupy the same subcarrier and the same symbol number. In general, according to a specific scenario, at most 3 groups of additional DMRSs can be added when a DMRS is single-symbol-preceded, and at most 1 group of additional DMRSs can be added when a DMRS is dual-symbol-preceded, and the DMRS can be configured as needed and indicated by control signaling.

From a time domain perspective, the network device may inform the positions of the preamble DMRSs and the additional DMRSs through RRC signaling. Table 1 shows the time domain resource locations occupied by the single-symbol DMRSs, and table 2 shows the time domain resource locations occupied by the dual-symbol DMRSs. Wherein, the Position of the DMRS of type a, e.g., DMRS-TypeA-Position in table 1, indicates the Position of the preamble DMRS, and the Position of the additional DMRS, e.g., DMRS-additionposition in table 1, indicates the Position of the additional DMRS. In table l _d The number of the fingers is counted from the first symbol of a slot (slot) where the PDSCH is located to the last symbol occupied by the PDSCH. l ₀ Denotes the time domain location of the preamble DMRS, and l ₁ And a specific number indicates a time domain location of the additional DMRS.

TABLE 1

TABLE 2

From the aspect of frequency domain, occupied frequency domain resources corresponding to different port numbers are determined, so that for the same port, the frequency domain resources of the pre-DMRS and the additional DMRS are the same.

In the 5G communication system, with the rapid development of mobile communication, there are higher requirements in many aspects such as system capacity, instantaneous peak rate, spectrum efficiency, cell edge user throughput, and delay. In the system, the multi-station cooperative transmission is a method for improving the resource utilization rate and reducing the inter-cell interference level. The multi-station cooperation technology includes coordinated beamforming (coordinated beamforming), coordinated scheduling (coordinated scheduling), joint transmission (joint transmission), dynamic transmission point selection (dynamic point selection), dynamic transmission point muting (dynamic point muting) and other technologies. The base stations can interact through backhaul, air interfaces and other ways, and coordinate to transmit the required information. By the transmission methods, the interference to edge users can be reduced, and the performance of the system can be improved. By adopting a multi-station cooperative transmission mode, the system can schedule more data streams, however, the maximum number of the DMRS ports is only 12, and at this time, the number of the DMRS ports becomes an important factor influencing the system performance.

In view of this, the present application provides a method for indicating a DMRS, which increases the number of DMRS orthogonal ports by performing channel estimation using a part of DMRS, thereby ensuring the performance of a system.

The method provided by the application is suitable for uplink transmission and can also be used for downlink transmission. The following embodiments are merely examples of downlink transmission and are not limited in any way.

In the following embodiments, a network device takes a base station as an example, and a terminal device takes a UE as an example.

It should be noted that, in the embodiments of the present application, only the configuration of Type a of DMRS and the configuration of Type1 of DMRS are described as examples. The technical scheme of the application can be applied to the configuration of Type B of DMRS and the configuration of Type2 of DMRS.

Fig. 4 is a schematic diagram of a method 400 for indicating a DMRS according to an embodiment of the present application, where the method 400 includes:

step S410, the terminal device receives first indication information, wherein the first indication information is used for determining the configuration of a demodulation reference signal DMRS, the DMRS occupies K symbols, and K is an integer greater than 1.

In this application, the DMRS configuration may be understood as various time-frequency resource configurations and symbol type configurations of a DMRS to be transmitted (or a DMRS to be transmitted) by a network device. For example, the symbols occupied by the DMRS, the port information of the DMRS, whether the DMRS is a single symbol or a dual symbol, and the like are configured. The single-symbol DMRS indicates that DMRS occupies a single symbol, and the dual-symbol DMRS indicates that DMRS occupies two symbols occurring in pairs. It should be understood that, in the present application, which symbols are ultimately used by the terminal device for channel estimation (i.e., the first DMRS) or which symbols are ultimately used by the terminal device for channel estimation (i.e., the first DMRS) needs to be determined according to the second indication information.

In this application, the first DMRS is a part of DMRS in a DMRS configured by a network device for a terminal, and may also be understood as a symbol occupied by the first DMRS in this application, which may be a part of DMRS symbols configured by the network device for the terminal device. In other words, in the present application, the network device may transmit the DMRS (i.e., the first DMRS) on the partial symbol, and the terminal device may perform channel estimation based on the DMRS (i.e., the first DMRS) on the partial symbol.

It should be understood that, before step S410, step S411 may be further included, in which the network device sends the first indication information to the terminal device.

And step S420, the terminal equipment receives second indication information, wherein the second indication information is used for determining a first DMRS used for channel estimation in the configured DMRS, and the first DMRS occupies L symbols, wherein L is less than K.

In the application, part of DMRS is used for channel estimation, and the part of DMRS is the first DMRS.

As one example, the second indication information may indicate a type of the first DMRS.

For example, the first DMRS is a preamble DMRS or the first DMRS is an additional DMRS. The preamble DMRS may further include the following 2 types. The first type: the pre-DMRS is a first DMRS, and the pre-DMRS and the additional DMRS do not transmit data; the second type: the preamble DMRS is the first DMRS, and the preamble DMRS does not transmit data, but an additional DMRS may be used to transmit data.

As one example, the second indication information may indicate a configuration of symbols of the first DMRS.

In particular, the second indication information may indicate which symbols in the DMRSs may be used for channel estimation and whether the symbols may be used for transmitting data if some of the DMRSs are not used for channel estimation.

It should be understood that, before step S420, step S421 may be further included, in which the network device sends the second indication information to the terminal device.

In the present application, L is an integer greater than 0.

It should be understood that, in the present application, the indication information may be indicated in Downlink Control Information (DCI). Illustratively, the indication information may be a field in the downlink control information. For example, the terminal device may acquire the type information according to an indication in the DCI. The indication information may also be indicated in Radio Resource Control (RRC) signaling. Illustratively, the indication information may be a field in RRC signaling. For example, the terminal device may acquire the indication information according to an indication in RRC.

The indication information may be the first indication information or the second indication information in the text.

Alternatively, step S410 and step S420 may be separate or performed together. For example, the first indication information and the second indication information may be transmitted in the same downlink control information or may be transmitted in different downlink control information.

And step S430, the terminal equipment determines the time-frequency resource of the first DMRS according to the first indication information and the second indication information.

As an example, the terminal device may determine a preamble DMRS for channel estimation according to the second indication information (it may also be understood that the preamble DMRS is the first DMRS), and determine a time-frequency resource location of the preamble DMRS according to the first indication information.

As an example, the terminal device may determine an additional DMRS for channel estimation (it may also be understood that the additional DMRS is a first DMRS) according to the second indication information, and determine a time-frequency resource location of the additional DMRS according to the first indication information.

As an example, the terminal device may determine, according to the second indication information, part of the symbols in the DMRSs to be used for channel estimation (it may also be understood that part of the symbols in the DMRSs are the first DMRS), and determine, according to the first indication information, which symbols are the first DMRS. And so on.

And step S440, the terminal equipment carries out channel estimation according to the first DMRS.

For example, if only the pre-DMRS is used for channel estimation, the UR may estimate channels at time-frequency Resource Element (RE) positions of the pre-DMRS according to the pre-DMRS, and extend channels on a whole Resource Block (RB) according to the channels on the REs.

According to the method of the present application, the terminal device may perform channel estimation using the partial DMRS, for example, channel estimation independently using a preamble DMRS, channel estimation independently using an additional DMRS, channel estimation using a partial additional DMRS, or channel estimation using a preamble DMRS and a partial additional DMRS. The number of DMRS orthogonal ports is increased, so that the performance of the system is guaranteed.

Fig. 5 is a schematic diagram of a method 500 for indicating a DMRS according to an embodiment of the present application, where the method 500 includes:

in step S510, the base station transmits, to the UE, indication information #1 (an example of first indication information), where the indication information #1 is used to determine the configuration of a demodulation reference signal DMRS that occupies K symbols (where K is an integer greater than 1).

For example, the base station may transmit downlink control information #1 or radio resource control information #1 to the UE, indicating the configuration of the demodulation reference signal DMRS.

In this application, the indication information #1 of the DMRS may include: DMRS symbol type information, e.g., whether DMRS is single or dual symbol; and time-frequency resource information of the DMRS, for example, the position of the preamble DMRS time domain, the position of the additional DMRS time domain, the port information of the preamble DMRS, the port information of the additional DMRS, and the like.

As an example, the base station may transmit RRC signaling indicating a symbol type of the DMRS, e.g., single symbol or dual symbol, to the terminal device; time domain resources, e.g., configuration of symbols occupied by DMRS, etc. The base station may also transmit DCI signaling to the terminal device, where the DCI signaling is used to indicate frequency domain resources of the DMRS, for example, port information of the DMRS.

In step S520, the base station transmits, to the UE, indication information #2 (an example of second indication information), the indication information #2 being used to determine a type of a first one of the DMRSs used for channel estimation.

For example, the base station may transmit downlink control information #2 to the UE, and the downlink control information #2 may be used to determine a type of a first DMRS used for channel estimation in the DMRSs.

In the present application, the type of the first DMRS used for channel estimation may include the following cases: the preamble DMRS is used alone for channel estimation, and the additional DMRS is used alone for channel estimation. The first DMRS may further include 2 cases, such as the following case one and case two:

the first condition is as follows: and only the preposed DMRS is adopted for channel estimation, and the preposed DMRS and the additional DMRS do not transmit data.

Case two: channel estimation using only a preamble DMRS that does not transmit data and additional DMRS locations can transmit data

In one possible implementation, the base station may send DCI signaling to the UE, where the DCI carries one DMRS type enabling indication, that is, indicates a type of DMRS used in UE channel estimation. As an example, the DMRS type enabled indication is 2 bits (bit) containing 4 states, as shown in table 3.

In one possible implementation, the type of the first DMRS may be indicated in an enumerated manner. For example, as shown in table 3: { only Front-load 1} may indicate that channel estimation is performed using only the preamble DMRS, and neither the preamble DMRS nor the additional DMRS transmits data; { only additional } may indicate that channel estimation is performed only with the additional DMRS, and neither the preamble DMRS nor the additional DMRS transmit data; { bout Front-load and additional } may indicate that the preamble DMRS and the additional DMRS are simultaneously used for channel estimation; { only Front-load 2} may indicate that channel estimation is performed using only the preamble DMRS by default, the preamble DMRS does not transmit data, and the additional DMRS position may transmit data

TABLE 3 different status bits indicate different meanings

It should be noted that the correspondence between each bit state in table 1 and the corresponding description is only illustrative and not limiting.

It should be understood that, in the present application, the indication information #1 and the indication information #2 may be in the same signaling or in different signaling, for example, the base station may transmit DCI to the UE, and the DCI includes the indication information #1 and the indication information #2. In the present application, it may be understood that the base station may transmit the indication information #1 and the indication information #2 separately, or the base station may transmit only one signaling, and the signaling includes the indication information #1 and the indication information #2.

Alternatively, step S510 and step S520 may be separate or performed together. In some embodiments, if step S510 and step S520 are executed separately, step S510 and step S520 of the present application are not limited in sequence.

In step S521, the base station determines the time-frequency resource of the transmitted data.

In a possible implementation manner, the base station may specifically determine which time-frequency resources the data is transmitted on according to the second indication information. As an example, if the second indication information indicates that the first DMRS is a pre-DMRS (e.g., bit state bit 01 or { only Front-load 1 }), at this time, the base station may determine time-frequency resources excluding the pre-DMRS and the additional DMRS in the PDSCH, and transmit data on other time-frequency resources. If the second indication information indicates that the first DMRS is a pre-DMRS (e.g., bit status bit 00 or indicates { only Front-load 2 }), at this time, the base station may determine time-frequency resources excluding the pre-DMRS in the PDSCH and transmit data on the additional DMRS as well as other time-frequency resources. As an example, if the second indication information indicates that the first DMRS is an additional DMRS (e.g., bit status bit 10 or indicates { only additional }), then the base station may determine time-frequency resources excluding the preamble DMRS and the additional DMRS in the PDSCH and transmit data on other time-frequency resources.

In step S522, the base station transmits data to the UE.

In one possible implementation, the base station may transmit data to the UE on the PDSCH.

Step S530, the UE receives the indication information #1 and the indication information #2 sent by the base station, and determines the time-frequency resource of the first DMRS according to the indication information #1 and the indication information #2.

For example, the UE may receive the indication information #1 and the indication information #2 transmitted by the base station, and determine the location of the time-frequency resource of the first DMRS for channel estimation by combining the first DMRS type indication and the DMRS configuration information.

As an example, if a bit status bit of type indication information (e.g., second indication information) of the first DMRS is 01 (or indicates { only Front-load 1 }), the UE may determine to perform channel estimation only from time-frequency resources of the preamble DMRS. When needing to be explained, when PDSCH is type A, UE adopts DMRS-type A-Position to determine the time domain Position of the preposed DMRS; when the PDSCH is type B, the time domain position of the preamble DMRS is the head symbol of the PDSCH. The UE may determine the location of the additional DMRS time domain resource by DMRS-additional position. The UE can determine the frequency domain positions of the preamble DMRS and the additional DMRS according to the DMRS port information. The UE defaults to have no data transmission or DMRS transmission on the time-frequency resource of the additional DMRS, or to transmit zero power DMRS; in other words, the UE determines the time-frequency resources of the data on the PDSCH without considering the time-frequency resources of the preamble DMRS and the additional DMRS.

As another example, if the bit status bit of the type indication information of the first DMRS is 10 (or indicates { only additional }), the UE may determine to perform channel estimation only according to time-frequency resources of the additional DMRS. For example, in (b) of fig. 6, UE #1 performs channel estimation using only the additional DMRS. In addition, the UE #1 can judge the position of the time domain resource of the preposed DMRS, and the UE #1 determines that the DMRS is not transmitted on the time frequency resource, or called zero-power DMRS, or data transmission is not performed; in other words, the UE does not consider the time-frequency resources of the preamble DMRS and the additional DMRS when determining the time-frequency resources of the data on the PDSCH thereafter.

As another example, if the bit status bit of the type indication information of the first DMRS is 00 (or indicates { only Front-load 2 }), the UE may determine to perform channel estimation only according to the time-frequency resource of the preamble DMRS. For example, in fig. 6 (a), UE #2 performs channel estimation using only the preamble DMRS. In other words, UE #2 does not take the preamble DMRS time-frequency resource into account when determining the time-frequency resource of the data on the PDSCH thereafter, but needs to take the time-frequency resource of the additional DMRS into account. Because, there is data transmission on the additional DMRS at this time.

It should be noted that, if the bit status bit of the type indication information of the first DMRS is 11 (or indicates { bouth Front-load and additional }), or the base station does not send the type indication information of the first DMRS, or the UE does not receive the type indication information of the first DMRS, it indicates that the UE may perform channel estimation using the preamble DMRS and the additional DMRS at the same time, or may default that the first DMRS is a set of the preamble DMRS and the additional DMRS, and at this time, the prior art may be referred to for channel estimation and data decoding.

Step S540, the UE adopts the first DMRS to carry out channel estimation.

For example, when UE #1 performs channel estimation based on the pre-DMRS, it may perform channel estimation using only the pre-DMRS, that is, it may estimate only channels at RE positions of the pre-DMRS, and extend channels over the entire RB based on the channels at these REs. The expanding process comprises interpolation, filtering and the like.

For example, when UE #2 performs channel estimation based on the additional DMRSs, it is possible to perform channel estimation using only the additional DMRSs, that is, it is possible to estimate only channels at RE positions of the additional DMRSs and to extend channels over the entire RB based on the channels at these REs. The expansion process comprises methods such as interpolation, filtering and the like.

For example, the UE may estimate channels on REs where DMRSs are located, respectively, according to the preamble DMRSs and the additional DMRSs, and then expand channels on the entire RB according to the channels on the REs. The expansion process comprises methods such as interpolation, filtering and the like.

In step S550, the UE determines time-frequency resources of the transmitted data.

In a possible embodiment, after the UE determines the position of the DMRS for channel estimation according to the indication information #1, the UE may also determine the position of the time-frequency resource of the transmitted data jointly according to RRC time-frequency Resource Allocation (RA).

As an example, if the bit status bit of the type indication information of the first DMRS is 01 (or indicates { only Front-load 1 }), the UE may determine to perform channel estimation only according to the time-frequency resource of the preamble DMRS. And when the UE determines the time-frequency resources of the data on the PDSCH, the time-frequency resources of the preposed DMRS and the additional DMRS are not considered. That is, the PDSCH excludes the time-frequency resources of the preamble DMRS and the additional DMRS, and transmits data on other time-frequency resources.

As an example, if a bit status bit of the type indication information of the first DMRS is 10 (or indicates { only additional }), the UE may determine to perform channel estimation only according to time-frequency resources of the additional DMRS. And when the UE determines the time-frequency resources of the data on the PDSCH, the time-frequency resources of the preposed DMRS and the additional DMRS are not considered. That is, the PDSCH excludes the time-frequency resources of the preamble DMRS and the additional DMRS, and transmits data on other time-frequency resources.

As another example, if the bit status bit of the type indication information of the first DMRS is 00 (or indicates { only Front-load 2 }), the UE may determine that channel estimation is performed only according to the time-frequency resource of the preamble DMRS, and data is placed on the time-frequency resource location of the additional DMRS. Therefore, when the UE determines the time-frequency resource of the data on the PDSCH, the time-frequency resource of the pre-DMRS is not considered, but the time-frequency resource of the additional DMRS needs to be considered, that is, when the UE determines the time-frequency resource of the data on the PDSCH, only the time-frequency resource occupied by the pre-DMRS is removed, and the data is transmitted on other time-frequency resources.

According to the method provided by the embodiment of the application, the UE can independently use the front DMRS or independently adopt the additional DMRS to estimate the data channel on the basis of not changing the existing signaling architecture. The number of orthogonal DMRS ports can be increased, so that the whole system can schedule more data streams, and the performance of the system is guaranteed.

Fig. 7 is a schematic diagram of a method 700 for indicating a DMRS according to an embodiment of the present application, where the method of fig. 7 includes:

in step S710, the base station transmits to the UE indication information #1 (an example of first indication information) of DMRS, and the indication information #1 is used to determine the arrangement of a demodulation reference signal DMRS.

The indication information #1 of the DMRS includes symbol information of the DMRS and time-frequency location information of the DMRS.

In this application, the DMRS configuration information #1 may include: DMRS symbol type information, e.g., whether DMRS is single symbol or dual symbol; and time-frequency position information of the DMRS, for example, the position of the preamble DMRS time domain, the position of the additional DMRS time domain, and port information of the preamble DMRS, the port information of the additional DMRS, and the like.

As an example, the base station may transmit RRC signaling indicating a symbol type of the DMRS, e.g., single symbol or dual symbol, to the terminal device; time domain resources, e.g., configuration of symbols occupied by DMRS, etc. The base station may also transmit DCI signaling to the terminal device, where the DCI signaling is used to indicate frequency domain resources of the DMRS, for example, port information of the DMRS.

In step S720, the base station transmits, to the UE, indication information #2 (an example of second indication information), the indication information #2 being used to determine the arrangement of symbols of the first DMRS used for channel estimation in the DMRSs.

It should be noted that there are various specific implementations of the indication information #2 in the present application, and in a possible implementation, a new field may be added in the DCI, where the content carried by the field is the indication information #2, and the indication information #2 at this time is independently indicated for each UE. In this implementation, a group (group) of UEs, described below, may be considered as only one UE in the group.

In another possible implementation manner, the implementation manner may be implemented by using group DCI. The content of the indication information #2 is enumerated, for example, when the indication information indicates 4 bits, there are 16 kinds of indication information in total. The UEs may be grouped for all UEs in the system, and the indication information used by each group of UEs is the same. For this group of UEs, it may be implemented using group DCI, where the content of the group DCI is indication information #2.

It should be noted that, in the present application, different UE groups are distinguished mainly because the Radio Network Temporary Identities (RNTIs) scrambled on the DCI for the different UE groups are different. For example, for a user in UE group #1, RNTI #1 is used to detect DCI carrying DMRS type, and when UE group #1 can decode the DCI correctly, it indicates that the DCI is transmitted to UE group # 1; similarly, for the user of the UE group #2, the DCI is scrambled with RNTI #2.

For example, the base station may transmit downlink control information #2 to the UE, indicating the configuration of symbols of the first DMRS used for channel estimation, or it may be understood that the downlink control information #2 may indicate the position of time-frequency resources of the first DMRS used for channel estimation.

It should be noted that, in the present application, a protocol may specify N bits for indicating whether DMRSs of N symbols are used for channel estimation.

(1) Single symbol DMRS

If the RRC configures the single-symbol DMRSs, the DMRSs may be the single-symbol DMRSs of Type1, or the single-symbol DMRSs of Type 2. As described previously, for a single-symbol preamble DMRS, a maximum of 3 sets of additional DMRSs may be configured, and thus, the single-symbol DMRS has a maximum of 4 symbols. That is, in the present application, the length of the downlink control information DCI is 4 bits, and each bit may indicate whether a corresponding symbol belongs to the first DMRS.

The first condition is as follows: number of symbols N of RRC configured DMRS equals 4

As an example, as shown in (a) of fig. 8, assuming that the RRC is configured with a single symbol DMRS, there are 4 symbols of the configured DMRS. According to table 1, rrc may configure the preamble DMRS as symbol 2, and the additional DMRS occupies symbol 5, symbol 8, and symbol 11, respectively. For UE group (group) #1, when DCI #2 is indicated as 1010, as shown in (b) in fig. 8, DMRSs on symbol 2 and symbol 8 belong to a first DMRS (it can also be understood that the first DMRS is composed of DMRSs on symbol 2 and symbol 8 in common), and DMRSs are neither present nor data on symbol 5 and symbol 11. That is, for each UE in the UE group #1, DMRSs on symbol 2 and symbol 8 are used for data channel estimation; and during data demodulation, the time frequency resource of the PDSCH is allocated according to the time frequency resource in the DCI, and the time frequency resource on the symbol 2, the symbol 5, the symbol 8 and the symbol 11 is deducted, so that the time frequency resource of the transmitted data is determined. As another example, for UE group #2, when the DCI is indicated as 0101, as shown in (c) of fig. 8, the DMRSs on symbol 5 and symbol 11 belong to a first DMRS (it can also be understood that the first DMRS is composed of the DMRSs on symbol 5 and symbol 11 in common), and there is neither data nor a DMRS on symbol 2 and symbol 8. That is, for each UE in UE group #2, the data channel estimation employs DMRS on symbol 5 and symbol 11; and during data demodulation, the time frequency resource of the PDSCH is allocated according to the time frequency resource in the DCI, and the time frequency resource on the symbol 2, the symbol 5, the symbol 8 and the symbol 11 is deducted, so that the time frequency resource of the transmitted data is determined.

In this embodiment, the DMRS may be configured according to symbols, and thus, the DCI may also flexibly indicate. For example, the DCI may be denoted by 1000, which indicates that symbol 2 is used for data channel estimation (the first DMRS may be understood as the DMRS on symbol 2). It may also be understood that channel estimation is performed using only the preamble DMRS (it may also be understood that the first DMRS is the preamble DMRS); for another example, the DCI may indicate 0110, which means that the data channel estimation uses symbol 5 and symbol 8 (it may be understood that the first DMRS is composed of DMRSs on symbol 2 and symbol 8 in common). It can also be understood that a part of the additional DMRS is used for channel estimation; as another example, the DCI may indicate 0111, indicating that the data channel estimation employs symbol 5, symbol 8, and symbol 11. It can also be understood that all additional DMRSs are used for channel estimation. Still alternatively, for another example, the DCI may indicate 1110 that the data channel estimation employs symbol 2, symbol 5, and symbol 8. It can also be understood that a preamble DMRS and a partial additional DMRS may be employed for channel estimation.

Case two: the number of symbols N of RRC-configured DMRS is less than 4

If the number N of symbols of the RRC-configured DMRS is less than 4, in the present application, the bit number of the DCI may still be 4 bits (because the DCI is blind detected by the UE, the UE needs to know the bit length determined by the DCI). In the present application, a protocol may specify that N bits may be used to indicate a case where DMRSs of N symbols are used for channel estimation; optionally, the last 1 bit may be used to indicate whether there is data to transmit on the remaining symbols.

As an example, assuming N =3, according to table 1, rrc may configure DMRS as symbol 2, symbol 6, and symbol 9. If the DCI indication is 1010, the first 3 bits "101" in the DCI indicate that DMRSs on symbol 2 and symbol 9 are used for data channel estimation (it can also be understood that the first DMRS is composed of DMRSs on symbol 2 and symbol 9 in common); the last bit "0" indicates that no data is sent on the unused symbol 6; if the DCI is indicated as 1011, the first 3 bits "101" in the DCI indicate that DMRS on symbol 2 and symbol 9 are used for channel estimation, and the last bit "1" indicates that data is transmitted on symbol 6 that is not used. For another example, if the DCI indication is 1000, the first 3 bits "100" in the DCI indicate that the data channel estimation employs DMRS on symbol 2; the last bit "0" indicates that no data is transmitted on the symbol 6 and the symbol 9 that are not being used. For another example, if the DCI indication is 1001, the first 3 bits "100" in the DCI indicate that the data channel estimation employs the DMRS on symbol 2; the last bit "1" indicates that data may be transmitted on the unused symbol 6 and symbol 9.

As an example, assuming N =2, according to table 1, rrc may configure DMRSs as symbol 2, symbol 7. If the DCI indication is 1100, the first 2 bits "11" in the DCI indicate that DMRSs on symbol 2 and symbol 7 are used for data channel estimation (it can also be understood that the first DMRS is composed of DMRSs on symbol 2 and symbol 7 in common); at this time, the last 2 bits "00" in the DCI may have no meaning. If the DCI indication is 1000, the first 2 bits "10" in the DCI indicate that the DMRS on symbol 2 is adopted for data channel estimation; the last bit "0" may indicate that no data is sent on the unused symbol 7. If the DCI indication is 1001, the first 2 bits "10" in the DCI indicate that the data channel estimation uses DMRS on symbol 2; the last bit "0" may indicate that data is transmitted on the unused symbol 7.

Case three: the bit number of the DCI is determined according to the symbol number of the RRC configuration DMRS.

As an example, assuming that the number of symbols of the RRC-configured DMRS is N, and the length of the second indication information of the group DCI is set to N bits, the protocol may specify that N bits may be used to indicate that the DMRSs of N symbols are used for channel estimation.

(2) Dual-symbol DMRS

If the RRC configures the dual-symbol DMRS, the DMRS may be a dual-symbol DMRS of Type1, or a dual-symbol DMRS of Type 2. As described previously, for the dual-symbol preamble DMRS, at most 1 set of additional DMRSs may be configured, and thus, the dual-symbol DMRS has at most 2 dual-symbols. That is, the length of the downlink control information DCI may be 2 bits, and each bit may indicate whether a corresponding symbol has a DMRS signal. The specific operation is similar to the single symbol DMRS.

It should be noted that, the dual-symbol DMRSs are generally configured in pairs.

As an example, as shown in (a) of fig. 9, assuming that the RRC is configured with a dual-symbol DMRS, there are 2 symbols of the configured DMRS. According to table 2, the rrc may configure the dual symbols of the preamble DMRS as symbol 2 and symbol 3, and the dual symbols of the additional DMRS as symbol 8 and symbol 9. For UE group (group) #3, when the DCI is indicated as 10, as shown in (b) of fig. 9, DMRSs for channel estimation (e.g., a first DMRS) are on symbol 2 and symbol 3, and neither data nor DMRSs are present on symbol 8 and symbol 9. That is, for each UE in UE group #3, the data channel estimation employs DMRSs on symbol 2 and symbol 3; and during data demodulation, the time frequency resource of the PDSCH is allocated according to the time frequency resource in the DCI and deducted from the time frequency resources on the symbol 2, the symbol 3, the symbol 8 and the symbol 9, so that the time frequency resource of the transmitted data is determined. As another example, for UE group #4, when DCI indicates 01, as shown in (c) of fig. 8, DMRS is present on symbol 8, symbol 9, and neither data nor DMRS is present on symbol 2 and symbol 3. That is, for each UE in UE group #4, the data channel estimation uses DMRSs on symbol 8 and symbol 9; during data demodulation, the time frequency resources of the PDSCH are allocated according to the time frequency resources in the DCI, and the time frequency resources on the symbol 2, the symbol 3, the symbol 8, and the symbol 9 are deducted, so as to determine the time frequency resources of the transmitted data.

Step S721, the base station determines the time-frequency resource of the transmitted data according to the second indication information.

In a possible implementation manner, the base station may specifically determine, according to the second indication information, which time-frequency resources are used for transmitting data. As an example, for a single-symbol DMRS, there are 4 symbols of the base station-configured DMRS, which are symbol 2, symbol 5, symbol 8, and symbol 11. If the second indication information is "1101", the base station may transmit data on time-frequency resources other than symbol 2 and symbol 5, for example, may transmit data on symbol 11. The method is similar to the dual-symbol DMRS, and is not described in detail.

Step S722, the base station transmits downlink data to the UE.

In one possible implementation, the base station may transmit downlink data to the UE on the PDSCH.

In step S730, the UE receives the indication information #2 and the indication information #2 sent by the base station, and determines the time-frequency resource of the first DMRS according to the indication information #2 and the indication information #2.

As an example, for a single-symbol DMRS, there are 4 symbols, namely symbol 2, symbol 5, symbol 8, and symbol 11, of the DMRS configured by the base station. If the DCI indication is 1000, the UE may determine that the data channel estimation uses the DMRS on symbol 2, i.e., the first DMRS is the DMRS on symbol 2. If the DCI indicates 0101, the UE may determine that the data channel estimation uses DMRS on symbol 5 and symbol 11, that is, the first DMRS is DMRS on symbol 5 and symbol 11.

Step S740, the UE performs channel estimation using the first DMRS.

For example, when the UE performs channel estimation based on the DMRSs on the symbol 2 and the symbol 5, the UE may perform channel estimation using only the DMRSs on the symbol 2 and the symbol 5, that is, only the channel at the RE position of the pre-DMRS and the channel at the RE position of the partial additional DMRS may be estimated, and the channel on the entire RB may be extended based on the channels on these REs. The expansion process comprises methods such as interpolation, filtering and the like.

For example, when the UE performs channel estimation based on the DMRSs on the symbol 5 and the symbol 11, the UE may perform channel estimation using only the DMRSs on the symbol 5 and the symbol 11, that is, only the channels at the RE positions to which some DMRSs are added can be estimated, and the channels on the entire RB are extended based on the channels on these REs. The expanding process comprises interpolation, filtering and the like.

Step S750, the UE determines the location of the time-frequency resource of the transmitted data.

In a possible embodiment, after the UE determines the location of the DMRS for channel estimation according to the indication information #2, the location of the time-frequency resource of the transmitted data may be determined jointly according to RRC time-frequency Resource Allocation (RA).

As an example, for a single-symbol DMRS, there are 4 symbols, namely symbol 2, symbol 5, symbol 8, and symbol 11, of the DMRS configured by the base station. If the DCI indicator is 1010, the UE may determine that the time-frequency resources of the PDSCH are allocated according to the time-frequency resources in the DCI and deduct the time-frequency resources on the symbol 2, the symbol 5, the symbol 8, and the symbol 11, so as to determine the time-frequency resources of the transmitted data. If the DCI indicator is 1000, the UE may determine that the time-frequency resource of the PDSCH is allocated according to the time-frequency resource in the DCI and deducts the time-frequency resources on the symbol 2, the symbol 5, the symbol 8, and the symbol 11, thereby determining the time-frequency resource of the transmitted data.

It should be noted that, in the present application, the sequence numbers of the steps do not completely represent the execution sequence of each step, and in the actual operation process, information interaction between the base station and the terminal device can be flexibly implemented.

It should be noted that, for convenience of clear description of technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same items or similar items with substantially the same functions and actions. For example, the first information and the second information are only used for distinguishing different information, and the order of the first information and the second information is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c; a and b; a and c; b and c; or a and b and c. Wherein a, b and c can be single or multiple.

It is understood that in the present application, "if 8230am", "when 8230am" and "if" refer to the corresponding processing of the device under certain objective conditions, and are not intended to be limiting in time, nor do they require any judgment action in the implementation of the device, nor do they imply any other limitation.

The term "simultaneously" in this application is to be understood as meaning at the same point in time, within a period of time, within the same period of time, and in particular in conjunction with the context.

According to the method provided by the embodiment of the application, on the basis of not changing the existing signaling architecture, the preposed DMRS is used, the additional DMRS is used for estimating the data channel, and part of the additional DMRS is used for estimating the channel or the preposed DMRS and part of the additional DMRS are used for estimating the channel. The number of orthogonal DMRS ports is increased, so that the whole system can schedule more data streams, and the performance of the system is guaranteed. Moreover, for a single symbol DMRS, the indication information is 4 bits; for the dual-symbol DMRS, the indication information is 2 bits, and the signaling overhead is small. And through the indication of the DCI, a preamble DMRS or a partial additional DMRS and the like can be flexibly adopted.

In the above, the DMRS indication method provided in the embodiment of the present application is described in detail with reference to fig. 3 to fig. 9. An indication DMRS device provided in an embodiment of the present application is described below with reference to fig. 10 and 11. It should be understood that the description of the apparatus embodiments corresponds to the description of the method embodiments, and therefore, for brevity, details are not repeated here, since the details that are not described in detail may be referred to the above method embodiments.

The above-mentioned scheme provided by the embodiments of the present application is mainly introduced from the perspective of interaction between the nodes. It is understood that each node, for example, a terminal device or a network device, includes a corresponding hardware structure and/or software module for performing each function in order to implement the above functions. Those of skill in the art would appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed in hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the terminal device or the terminal device may be divided into the functional modules according to the above 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 integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The following description will be given by taking an example in which each function module is divided for each function.

Fig. 10 is a schematic block diagram of a communication device 100 provided in an embodiment of the present application. As shown, the apparatus 100 may include: a transceiving unit 110 and a processing unit 120.

In a possible design, the apparatus 100 may be the terminal device in the foregoing method embodiment, and may also be a chip for implementing the functions of the terminal device in the foregoing method embodiment. It should be understood that the apparatus 100 may correspond to a terminal device in the method 400, the method 500, or the method 700 according to the embodiments of the present application, and the apparatus 100 may perform the steps corresponding to the terminal device in the method 400, the method 500, or the method 700 according to the embodiments of the present application. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

Specifically, the transceiver unit is configured to receive first indication information, where the first indication information is used to determine a configuration of a demodulation reference signal DMRS, where the configuration of the DMRS includes time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols; the receiving and sending unit is used for receiving second indication information, the second indication information is used for determining a first DMRS used for channel estimation in the DMRS, the first DMRS occupies L symbols, and L is less than K; the processing unit is used for determining the time-frequency resource of the first DMRS according to the first indication information and the second indication information; the processing unit is configured to perform channel estimation according to the first DMRS, where K is an integer greater than 1, and L is an integer greater than 0.

In some embodiments, the processing unit is configured to determine, according to the first indication information and the second indication information, a time-frequency resource of transmitted data, where the time-frequency resource of the data does not include a pre-DMRS time-frequency resource on a physical downlink shared channel.

In a possible design, the apparatus 100 may be a network device in the foregoing method embodiment, and may also be a chip for implementing the function of the network device in the foregoing method embodiment. It should be understood that the apparatus 100 may correspond to the network device in the method 400, the method 500, or the method 700 according to the embodiment of the present application, and the apparatus 100 may perform the steps corresponding to the network device in the method 400, the method 500, or the method 700 according to the embodiment of the present application. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

Specifically, the transceiver unit is configured to send first indication information, where the first indication information is used to determine a DMRS configuration, where the DMRS configuration includes time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols; the receiving and sending unit is configured to send second indication information, where the second indication information is used to determine a first DMRS used for channel estimation in the DMRSs, and the first DMRS occupies L symbols, where L is less than K, where K is an integer greater than 1 and L is an integer greater than 0.

In some embodiments, the processing unit is configured to determine time-frequency resources of data to be transmitted, where the time-frequency resources of the data do not include the preamble DMRS time-frequency resources on the physical downlink shared channel; the transceiver unit is configured to send the data on the physical downlink shared channel.

Fig. 11 is a schematic block diagram of a communication device 200 according to an embodiment of the present application. As shown, the apparatus 200 includes: at least one processor 220. The processor 220 is coupled to the memory for executing instructions stored in the memory to transmit signals and/or receive signals. Optionally, the apparatus 200 further comprises a memory 230 for storing instructions. Optionally, the apparatus 200 further comprises a transceiver 210, and the processor 220 controls the transceiver 210 to transmit and/or receive signals.

It should be appreciated that the processor 220 and the memory 230 may be combined into a single processing device, and that the processor 220 is configured to execute the program code stored in the memory 230 to implement the functions described above. In particular implementations, the memory 230 may be integrated into the processor 220 or may be separate from the processor 220.

It is also understood that the transceiver 210 may include a transceiver (or, receiver) and a transmitter (or, transmitter). The transceiver may further include an antenna, and the number of antennas may be one or more. The transceiver 210 may be a communication interface or interface circuit.

In particular, the transceiver 210 in the apparatus 200 may correspond to the transceiver unit 110 in the apparatus 100, and the processor 220 in the apparatus 200 may correspond to the processing unit 120 in the apparatus 200.

It should be understood that the specific processes of each transceiver processor for executing the above corresponding steps have been described in detail in the above method embodiments, and are not described herein again for brevity.

Fig. 12 is a schematic diagram of a network device provided in the present application. The structure and function of the network device is described below in conjunction with fig. 12. Fig. 12 is a schematic structural diagram of a network device 10 according to an embodiment of the present application. The network device 12 may be a base station in the method 400 shown in fig. 4. As shown in fig. 12, the network device 10 includes: a transceiver 1010 and a processor 1020.

Alternatively, the transceiver 1010 may be referred to as a Remote Radio Unit (RRU), a transceiver Unit, a transceiver, or a transceiver circuit. The transceiver 1010 may include at least one antenna 1011 and a radio frequency unit 1012, and the transceiver 1010 may be used for transceiving of radio frequency signals and conversion of the radio frequency signals to baseband signals.

Optionally, the network device 10 includes one or more Baseband units (BBUs) 1020. The baseband unit 1020 includes a processor 1022. The baseband unit 1020 is mainly used for performing baseband processing, such as channel coding, multiplexing, modulation, spreading, and the like, and controlling the base station. The transceiver 1010 and the baseband unit 1020 may be physically located together or may be physically separated, i.e., distributed base stations.

In an example, the baseband unit 1020 may be formed by one or more boards, and the multiple boards may jointly support a radio access network of a single access system, or may separately support radio access networks of different access systems. The baseband unit 1020 includes a processor 1022. Processor 1022 may be configured to control network device 10 to perform the corresponding operations in the method embodiments described in conjunction with fig. 4-9 above. Optionally, the baseband unit 1020 may further include a memory 1021 to store necessary instructions and data.

Fig. 13 is a schematic diagram of a terminal device provided in the present application. The structure and function of the terminal device will be described below with reference to fig. 13. The terminal device 30 may be a UE in the method 400 shown in fig. 4. As shown in fig. 13, the terminal device 30 includes a processor 31 and a transceiver 32.

Optionally, the transceiver 32 may include a control circuit and an antenna, wherein the control circuit may be used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals, and the antenna may be used for transceiving radio frequency signals.

Optionally, the terminal device 30 may further include a memory, an input-output device, and the like.

The processor 31 may be configured to process the communication protocol and the communication data, and control the whole terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to perform the corresponding operations described in conjunction with fig. 4 to 9. The memory is primarily used for storing software programs and data. When the terminal device is powered on, the processor 31 may read the software program in the memory, interpret and execute the instructions of the software program, and process the data of the software program.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, etc. as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), SLDRAM (synchronous-link DRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

According to the method provided by the embodiment of the present application, the present application further provides a computer program product having a computer program code stored thereon, which when run on a computer causes the computer to execute the method of any one of the embodiments 400, 500, and 700.

According to the method provided by the embodiment of the present application, a computer-readable medium is further provided, and the computer-readable medium stores program code, which when executed on a computer, causes the computer to execute the method of any one of the embodiments of the methods 400, 500 and 700.

According to the method provided by the embodiment of the application, the application also provides a system which comprises the device or the equipment.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

The network side device in the foregoing device embodiments corresponds to the terminal device and the network side device or the terminal device in the method embodiments, and the corresponding module or unit executes corresponding steps, for example, the communication unit (transceiver) executes the steps of receiving or transmitting in the method embodiments, and other steps except for transmitting and receiving may be executed by the processing unit (processor). The functions of specific elements may be referred to corresponding method embodiments. The number of the processors may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with one another at a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses, and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a portable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (30)

1. A method for indicating demodulation reference signals, comprising:

terminal equipment receives first indication information, wherein the first indication information is used for determining the configuration of a demodulation reference signal (DMRS), the configuration of the DMRS comprises time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols;

the terminal equipment receives second indication information, wherein the second indication information is used for determining a first DMRS used for channel estimation in the DMRS, the first DMRS occupies L symbols, and L is less than K;

the terminal equipment determines the time-frequency resource of the first DMRS according to the first indication information and the second indication information;

the terminal device performs channel estimation using the first DMRS,

wherein K is an integer greater than 1, and L is an integer greater than 0.

2. The method of claim 1, wherein the DMRS comprises a preamble DMRS and at least one additional DMRS, and wherein the second indication information is used to determine a first one of the DMRSs for channel estimation, comprising:

the second indication information is specifically used for determining the type of the first DMRS, and the type of the first DMRS at least comprises one of the following items: a preamble DMRS type, an additional DMRS type.

3. The method of claim 1, wherein the configuration of the DMRS further comprises symbols occupied by the DMRS, wherein the second indication information is used to determine a first DMRS of the DMRS for channel estimation, and wherein the method comprises:

the second indication information is specifically used for determining a configuration of symbols occupied by the first DMRS.

4. The method of claim 3, wherein the DMRS is a single-symbol DMRS, wherein the first indication information is used to determine a configuration of a symbol Y of the DMRS, and wherein when Y is equal to 4,

the number N of bits of the second indication information is equal to 4, N bits of the second indication information correspond to Y symbols of the DMRS in a one-to-one manner, an ith symbol corresponding to a bit value of an ith bit in the N bits is used for indicating whether the corresponding DMRS on the ith symbol belongs to the first DMRS, wherein i is greater than or equal to 1 and less than or equal to 4.

5. The method of claim 3, wherein the DMRS is a single symbol DMRS, wherein the first indication information is used to determine a configuration of a symbol Y of the DMRS, and wherein Y is less than 4,

the number of bits N of the second indication information is equal to 4, the first Y bits of the N bits correspond to the symbols of the Y DMRSs in a one-to-one manner, and the first Y bits of the N bits are used for indicating whether the corresponding DMRS on the Y symbols belongs to the first DMRS.

6. The method according to any one of claims 1 to 5, further comprising:

and the terminal equipment determines the time-frequency resource of the transmitted data according to the first indication information and the second indication information, wherein the time-frequency resource of the data does not comprise the pre-DMRS time-frequency resource on the physical downlink shared channel.

7. The method according to any one of claims 1 to 6, wherein the configuration of the DMRS comprises at least one of: the method comprises the steps of configuring the symbol type of the DMRS, configuring the time-frequency resource of the preposed DMRS and configuring the time-frequency resource of the additional DMRS.

8. A method for indicating demodulation reference signals, comprising:

the method comprises the steps that network equipment sends first indication information, wherein the first indication information is used for determining the configuration of a demodulation reference signal (DMRS), the configuration of the DMRS comprises time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols;

the network equipment transmits second indication information, wherein the second indication information is used for determining a first DMRS used for channel estimation in the DMRS, the first DMRS occupies L symbols, and L is less than K,

wherein K is an integer greater than 1, and L is an integer greater than 0.

9. The method of claim 8, wherein the DMRS comprises a preamble DMRS and at least one additional DMRS, wherein the second indication information is used to determine a first DMRS used for channel estimation in the DMRS, and wherein the method comprises:

the second indication information is specifically used for determining the type of the first DMRS, and the type of the first DMRS at least comprises one of the following items: a preamble DMRS type, an additional DMRS type.

10. The method of claim 8, wherein the configuration of the DMRS further includes symbols occupied by the DMRS, wherein the second indication information is used to determine a first DMRS of the DMRS for channel estimation, and wherein the method comprises:

the second indication information is specifically used for determining a configuration of symbols occupied by the first DMRS.

11. The method of claim 10, wherein the DMRS is a single symbol DMRS, wherein the first indication information is used to determine a configuration of a symbol Y of the DMRS, and wherein when Y is equal to 4,

the number N of bits of the second indication information is equal to 4, the N bits of the second indication information correspond to the symbols of the Y DMRSs in a one-to-one manner, an ith symbol corresponding to a bit value of the ith bit is used for indicating whether the corresponding DMRS on the ith symbol belongs to the first DMRS, wherein i is greater than or equal to 1 and less than or equal to 4.

12. The method of claim 10, wherein the DMRS is a single symbol DMRS, wherein the first indication information is used to determine a configuration of a symbol Y of the DMRS, and wherein Y is less than 4,

the number of bits N of the second indication information is equal to 4, the first Y bits of the N bits correspond to the symbols of the Y DMRSs in a one-to-one manner, and the first Y bits of the N bits are used for indicating whether the corresponding DMRS on the Y symbols belongs to the first DMRS.

13. The method according to any one of claims 8 to 12, further comprising:

the network equipment determines time-frequency resources of transmitted data, wherein the time-frequency resources of the data do not comprise the preposed DMRS time-frequency resources on a physical downlink shared channel;

and the network equipment sends the data on the physical downlink shared channel.

14. The method according to any of claims 8 to 13, wherein the configuration of the DMRS comprises at least one of: the method comprises the steps of configuring the symbol type of the DMRS, configuring the time-frequency resource of the preposed DMRS and configuring the time-frequency resource of the additional DMRS.

15. A communication apparatus, comprising a transceiver unit and a processing unit:

the transceiver unit is used for receiving first indication information, wherein the first indication information is used for determining the configuration of a demodulation reference signal (DMRS), the configuration of the DMRS comprises time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols;

the transceiver unit is used for receiving second indication information, the second indication information is used for determining a first DMRS used for channel estimation in the DMRS, the first DMRS occupies L symbols, and L is less than K;

the processing unit is configured to determine, according to the first indication information and the second indication information, a time-frequency resource of the first DMRS;

the processing unit is configured to perform channel estimation based on the first DMRS,

wherein K is an integer greater than 1, and L is an integer greater than 0.

16. The apparatus of claim 15, wherein the DMRS comprises a preamble DMRS and at least one additional DMRS, wherein the second indication information is used to determine a first DMRS of the DMRS to use for channel estimation, and wherein the method comprises:

the second indication information is specifically used for determining the type of the first DMRS, and the type of the first DMRS at least includes one of the following items: a preamble DMRS type, an additional DMRS type.

17. The apparatus of claim 15, wherein the configuration of the DMRS further comprises symbols occupied by the DMRS, wherein the second indication information is used to determine a first DMRS used for channel estimation in the DMRS, and wherein the second indication information comprises:

the second indication information is specifically used for determining a configuration of symbols occupied by the first DMRS.

18. The apparatus of claim 17, wherein the DMRS is a single symbol DMRS, wherein the first indication information is used to determine a configuration of a symbol Y of the DMRS, and wherein Y is equal to 4,

the number N of bits of the second indication information is equal to 4, the N bits of the second indication information correspond to the symbols of the Y DMRSs in a one-to-one manner, an ith symbol corresponding to a bit value of the ith bit is used for indicating whether the corresponding DMRS on the ith symbol belongs to the first DMRS, wherein i is greater than or equal to 1 and less than or equal to 4.

19. The apparatus of claim 17, wherein the DMRS is a single symbol DMRS, wherein the first indication information is used to determine a configuration of a symbol Y of the DMRS, and wherein Y is less than 4,

the number of bits N of the second indication information is equal to 4, the first Y bits of the N bits correspond to the symbols of the Y DMRSs in a one-to-one manner, and the first Y bits of the N bits are used for indicating whether the corresponding DMRS on the Y symbols belongs to the first DMRS.

20. The apparatus of any one of claims 15 to 19,

the processing unit is configured to determine, according to the first indication information and the second indication information, a time-frequency resource of transmitted data, where the time-frequency resource of the data does not include the pre-DMRS time-frequency resource on a physical downlink shared channel.

21. The apparatus according to any one of claims 15 to 20, wherein the configuration of the DMRS comprises at least one of: the method comprises the steps of configuring the symbol type of the DMRS, configuring the time-frequency resource of the preposed DMRS and configuring the time-frequency resource of the additional DMRS.

22. A communication apparatus, comprising a transceiver unit and a processing unit:

the transceiver unit is configured to send first indication information, where the first indication information is used to determine a configuration of a demodulation reference signal (DMRS), where the configuration of the DMRS includes time-frequency resources occupied by the DMRS, and the DMRS occupies K symbols;

the transceiver unit is configured to transmit second indication information, the second indication information is used for determining a first DMRS used for channel estimation in the DMRS, the first DMRS occupies L symbols, and L is less than K,

wherein K is an integer greater than 1, and L is an integer greater than 0.

23. The apparatus of claim 22, wherein the DMRS comprises a preamble DMRS and at least one additional DMRS, wherein the second indication information is used to determine a first DMRS of the DMRS to use for channel estimation, and wherein the method comprises:

the second indication information is specifically used for determining the type of the first DMRS, and the type of the first DMRS at least includes one of the following items: a preamble DMRS type, an additional DMRS type.

24. The apparatus of claim 22, wherein the configuration of the DMRS further comprises symbols occupied by the DMRS, wherein the second indication information is used to determine a first DMRS of the DMRS for channel estimation, and wherein the second indication information comprises:

the second indication information is specifically used for determining a configuration of symbols occupied by the first DMRS.

25. The apparatus of claim 24, wherein the DMRS is a single symbol DMRS, wherein the first indication information is used to determine a configuration of a symbol Y of the DMRS, and wherein Y is equal to 4,

the number N of bits of the second indication information is equal to 4, the N bits of the second indication information correspond to the symbols of the Y DMRSs in a one-to-one manner, an ith symbol corresponding to a bit value of the ith bit is used for indicating whether the corresponding DMRS on the ith symbol belongs to the first DMRS, wherein i is greater than or equal to 1 and less than or equal to 4.

26. The apparatus of claim 24, wherein the DMRS is a single-symbol DMRS, wherein the first indication information is used to determine a configuration of a symbol Y of the DMRS, and wherein when Y is less than 4,

the number of bits N of the second indication information is equal to 4, the first Y bits of the N bits correspond to the symbols of the Y DMRSs in a one-to-one manner, and the first Y bits of the N bits are used for indicating whether the corresponding DMRS on the Y symbols belongs to the first DMRS.

27. The apparatus of any one of claims 22 to 26,

the processing unit is configured to determine a time-frequency resource of transmitted data, where the time-frequency resource of the data does not include the pre-DMRS time-frequency resource on a physical downlink shared channel;

the transceiver unit is configured to send the data on the physical downlink shared channel.

28. The apparatus of any of claims 22 to 27, wherein the configuration of the DMRS comprises at least one of: the method comprises the steps of configuring the symbol type of the DMRS, configuring the time-frequency resource of the preposed DMRS and configuring the time-frequency resource of the additional DMRS.

29. A computer-readable storage medium having stored thereon a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 7 or 8 to 14.

30. A computer program product, the computer program product comprising: computer program which, when executed, causes a computer to perform the method of any one of claims 1 to 7 or 8 to 14.

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