CN110839291B - Method and device for transmitting downlink control information - Google Patents

Abstract

The application provides a method and a device for transmitting downlink control information, wherein the method comprises the following steps: the network side equipment sends first configuration information to the terminal side equipment, the first configuration information is used for configuring a search space, the terminal side equipment receives the first configuration information sent by the network side equipment and detects first DCI and second DCI in the search space according to the first configuration information, and the first DCI comprises: a first field and a truncated second field; or the first field and the second field being truncated; or the first field being truncated and the second field being truncated; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI. The method and the device for transmitting the downlink control information can reduce the blind detection complexity of the terminal side equipment on the DCI.

Description

Method and device for transmitting downlink control information

Technical Field

The present application relates to the field of communications, and in particular to a method and device for transmitting downlink control information in the field of communications.

Background Art

In the fifth generation mobile communication system, frequency domain resource allocation is divided into resource allocation type 0 and resource allocation type 1, wherein resource allocation type 0 does not support frequency hopping, and resource allocation type 1 is further divided into two cases: frequency hopping is supported and frequency hopping is not supported. Therefore, the network side device can indicate to the terminal device whether frequency hopping is supported through the frequency hopping flag in the downlink control information (DCI). Specifically, if the frequency hopping flag indicates that frequency hopping is supported, the frequency domain resource assignment (FDRA) field of the DCI includes a frequency hopping offset indication bit and an actual frequency domain resource allocation indication bit, the highest bit or 2 bits indicate the size of the frequency hopping offset, and the remaining number of bits indicates resource allocation. If the frequency hopping flag indicates that frequency hopping is not supported, the entire frequency domain allocation indication field indicates resource allocation, and there is no frequency hopping offset indication bit.

DCIs of different formats may have different lengths. For DCIs of different lengths, during the process of DCI transmission between the network side device and the terminal device, the terminal side device needs to perform blind detection on DCIs of different lengths, which is highly complex.

Summary of the invention

The present application provides a method and apparatus for transmitting downlink control information, which can reduce the blind detection complexity of DCI by terminal side equipment.

In a first aspect, a method for transmitting downlink control information is provided, including: a terminal side device receives first configuration information sent by a network side device, the first configuration information being used to configure a search space; the terminal side device detects first downlink control information DCI and second DCI in the search space according to the first configuration information, the first DCI including: a first field and a truncated second field; or a truncated first field and a truncated second field; or a truncated first field and a truncated second field; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

The method for transmitting downlink control information in an embodiment of the present application transmits a second DCI and a first DCI having the same number of bits as the second DCI through a network side device and a terminal side device, which can reduce the blind detection complexity of the terminal side device, thereby improving system performance.

In the embodiment of the present application, the number of DCI bits refers to the number of bits of the entire DCI that the terminal side device needs to perform blind detection. It should be understood that the number of DCI bits is equal to the number of bits remaining after the DCI information bits are truncated or the number of DCI information bits plus the number of supplemented zero bits, wherein the number of DCI information bits is the number of information bits before the DCI is padded or truncated. If a truncation operation is performed on the DCI, the number of DCI bits is equal to the number of bits remaining after the DCI information bits are truncated. If a zero-padding operation is performed on the DCI, the number of DCI bits is equal to the number of DCI information bits plus the number of supplemented zero bits.

In order to reduce the blind detection complexity of the terminal side device, the network side device needs to perform a truncation operation on the longer DCI of at least two types of DCI with different lengths, so as to ensure that DCI of one type of length is sent. In this way, the terminal side device only needs to perform blind detection according to this length, and the complexity is relatively low. Specifically, the above-mentioned first DCI is the DCI generated after the network side device performs the truncation operation, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

The network side device can generate the first DCI through different operation modes, so there may be multiple situations for the fields in the first DCI, which is not limited in the embodiments of the present application.

In a possible implementation, the first DCI may be DCI format 0_, and the second DCI may be DCI format 1_0.

In combination with the first aspect, in some implementations of the first aspect, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

In combination with the first aspect, in certain implementations of the first aspect, the method also includes: when at least one of the following conditions is met, the terminal side device determines that the first DCI includes the truncated first field and the second field: the number of bits of the first field that are truncated is less than or equal to a first threshold; the number of bits of the truncated first field is greater than a second threshold; the bandwidth of the initial uplink bandwidth part is greater than a third threshold; the network side device configures the terminal side device to perform transmission precoding through high-level signaling.

Specifically, the network side device can determine whether to perform a truncation operation on the above-mentioned second field based on at least one of the information such as the number of bits of the first field that are truncated, the number of bits of the first field that are truncated, the bandwidth of the initial uplink bandwidth part, and whether the network side device configures the terminal side device to perform transmission precoding (transform precoder). Correspondingly, the terminal side device can determine the fields included in the first DCI based on at least one of the above information. In this way, the terminal side device and the network side device can make judgments based on the same information, thereby ensuring that the understanding of the terminal side device and the network side device is consistent and error-prone.

In an embodiment of the present application, the network side device retains the frequency hopping bit when performing a truncation operation. In this way, the truncation operation will not cause the terminal side device to be unable to frequency hop. The terminal side device can obtain frequency diversity gain through frequency hopping to ensure the performance of users at the edge of the cell.

Optionally, if the number of bits of the first field being truncated is less than or equal to the first threshold, it indicates that the network side device does not truncate the second field. In other words, if the number of bits of the first field being truncated is greater than the second threshold, it indicates that the network side device does not truncate the second field.

This is because when the number of bits to be intercepted is too small, only the first field is intercepted to ensure frequency hopping. If the number of bits to be intercepted is too large, only the first field is intercepted, which will lead to waste of resource allocation indication bits and loss of more indication resources. In this case, the second field can also be truncated.

Optionally, if the bandwidth of the initial uplink bandwidth part is greater than the third threshold, it indicates that the network side device does not truncate the second field and retains the frequency hopping bit. This is because only when the bandwidth of the initial uplink bandwidth part is large enough can frequency hopping bring a certain diversity gain. Otherwise, if the bandwidth of the initial uplink bandwidth part is not large enough, the frequency hopping gain is too small and meaningless.

The above-mentioned first threshold, second threshold and third threshold are predefined values, or values configured by the network side device for the terminal side device through signaling, and the embodiments of the present application do not limit this.

Optionally, when the network side device configures the transmission precoding enable, the network side device can retain the frequency hopping bit, otherwise the frequency hopping bit can be intercepted. In other words, when the DFT-s-OFDM waveform is used on the initial uplink bandwidth part, the network side device can retain the frequency hopping bit, otherwise the frequency hopping bit can be intercepted. This is because when the DFS-s-OFDM waveform is used on the initial uplink bandwidth part, the uplink coverage of the terminal side device is limited, and enabling frequency hopping can ensure uplink coverage.

In combination with the first aspect, in certain implementations of the first aspect, the first DCI is generated by any one of the following operation modes: an operation mode of truncating from the highest bit of the first field; an operation mode of truncating from the highest bit of the second field; an operation mode of truncating part of the information bits of the second field and then truncating from the highest bit of the first field.

Specifically, the network side device may truncate from the highest bit of the first field, or from the highest bit of the second field, or may first truncate some information bits of the second field, and then truncate from the highest bit of the first field. It should be understood that the second field is located before the first field. In this way, the network side device can adopt the above different operations according to different requirements, which greatly improves the flexibility of transmitting downlink control information.

In combination with the first aspect, in some implementations of the first aspect, the method also includes: the terminal side device receives second configuration information sent by the network side device, the second configuration information indicating the operation mode adopted for the first DCI; the terminal side device detects the first DCI and the second DCI in the search space according to the first configuration information, including: the terminal side device detects the first DCI and the second DCI in the search space according to the first configuration information and the second configuration information.

In another possible implementation, the above operation mode may be agreed upon in a protocol.

According to a second aspect, another method for transmitting downlink control information is provided, including: a network side device sends first configuration information to a terminal side device, the first configuration information is used to configure a search space; the network side device sends first downlink control information DCI and/or second DCI to the terminal side device, the first DCI including: a first field and a truncated second field; or a truncated first field and a truncated second field; or a truncated first field and a truncated second field; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

The method for transmitting downlink control information in an embodiment of the present application transmits a second DCI and a first DCI having the same number of bits as the second DCI through a network side device and a terminal side device, which can reduce the blind detection complexity of the terminal side device, thereby improving system performance.

In combination with the second aspect, in certain implementations of the second aspect, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

In combination with the second aspect, in certain implementations of the second aspect, the method also includes: when at least one of the following conditions is met, the network side device determines that the first DCI includes the truncated first field and the second field: the number of bits of the first field that are truncated is less than or equal to a first threshold; the number of bits of the truncated first field is greater than a second threshold; the bandwidth of the initial uplink bandwidth part is greater than a third threshold; the network side device configures the terminal side device to perform transmission precoding through high-level signaling.

In combination with the second aspect, in certain implementations of the second aspect, the first DCI is generated by any one of the following operation modes: an operation mode of truncating from the highest bit of the first field; an operation mode of truncating from the highest bit of the second field; an operation mode of truncating part of the information bits of the second field and then truncating from the highest bit of the first field.

In combination with the second aspect, in some implementations of the second aspect, the method further includes: second configuration information sent by the network side device to the terminal side device, wherein the second configuration information indicates an operation mode adopted for the first DCI.

According to a third aspect, another method for transmitting downlink control information is provided, including: a terminal side device determines a search space for a first downlink control information DCI, a second DCI, a third DCI and a fourth DCI; the terminal side device detects the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, the third DCI has the same number of bits as the second DCI generated according to an initial uplink bandwidth part and through a zero-padding operation or a truncation operation, and the fourth DCI has the same number of bits as the second DCI generated according to the initial downlink bandwidth part.

Specifically, there are four DCIs whose lengths may be different from each other. In order to reduce the blind detection complexity of the terminal side device, the network side device may perform an alignment operation on the DCI before sending. The alignment operation may be a zero padding operation or a truncation operation. The first DCI, the second DCI, the third DCI and the fourth DCI are DCIs after the alignment operation is performed on the four DCIs whose lengths may be different from each other.

The method for transmitting downlink control information in an embodiment of the present application aligns the DCI through a network side device, and the terminal side device detects the DCI in the corresponding search space in the same manner, which can reduce the blind detection complexity of the terminal side device and thus improve system performance.

In combination with the third aspect, in certain implementations of the third aspect, the first DCI is DCI format format 0_0 in a common search space CSS; the second DCI is DCI format 1_0 in the CSS; the third DCI is DCI format 0_0 in a user-specific search space USS; and the fourth DCI is DCI format 1_0 in the USS.

In a fourth aspect, another method for transmitting downlink control information is provided, including: a network side device determines a search space for a first downlink control information DCI, a second DCI, a third DCI and a fourth DCI; the network side device sends at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, the third DCI has the same number of bits as the second DCI generated according to an initial uplink bandwidth part and through a zero-padding operation or a truncation operation, and the fourth DCI has the same number of bits as the second DCI generated according to the initial downlink bandwidth part.

In combination with the fourth aspect, in certain implementations of the fourth aspect, the first DCI is DCI format format 0_0 in the common search space CSS; the second DCI is DCI format 1_0 in the CSS; the third DCI is DCI format 0_0 in the user-specific search space USS; and the fourth DCI is DCI format 1_0 in the USS.

In a fifth aspect, another method for transmitting downlink control information is provided, including: a terminal side device determines a search space for a first downlink control information DCI, a second DCI, a third DCI and a fourth DCI; the terminal side device detects the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, and the third DCI has the same number of bits as the fourth DCI generated according to the activation of the uplink bandwidth part and through a zero-padding operation.

In combination with the fifth aspect, in certain implementations of the fifth aspect, the first DCI is DCI format format 0_0 in the common search space CSS; the second DCI is DCI format 1_0 in the CSS; the third DCI is DCI format 0_0 in the user-specific search space USS; and the fourth DCI is DCI format 1_0 in the USS.

In a sixth aspect, another method for transmitting downlink control information is provided, including: a network side device determines a search space for a first downlink control information DCI, a second DCI, a third DCI and a fourth DCI; the network side device sends at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, and the third DCI has the same number of bits as the fourth DCI generated according to the activation of the uplink bandwidth part and through a zero-padding operation.

In combination with the sixth aspect, in certain implementations of the sixth aspect, the first DCI is DCI format format 0_0 in the common search space CSS; the second DCI is DCI format 1_0 in the CSS; the third DCI is DCI format 0_0 in the user-specific search space USS; and the fourth DCI is DCI format 1_0 in the USS.

In a seventh aspect, a device for transmitting downlink control information is provided, which is used to execute the method in any possible implementation of any of the above aspects. Specifically, the device includes a unit for executing the method in any possible implementation of any of the above aspects.

In an eighth aspect, another device for transmitting downlink control information is provided, the device comprising: a transceiver, a memory, and a processor. The transceiver, the memory, and the processor communicate with each other through an internal connection path, the memory is used to store instructions, the processor is used to execute the instructions stored in the memory to control the receiver to receive signals and control the transmitter to send signals, and when the processor executes the instructions stored in the memory, the processor executes the method in any possible implementation of any of the above aspects.

In a ninth aspect, a computer program product is provided, the computer program product comprising: a computer program code, when the computer program code is executed by a computer, the computer executes the methods in the above aspects.

In a tenth aspect, a computer-readable medium is provided for storing a computer program, wherein the computer program includes instructions for executing the methods in the above aspects.

In an eleventh aspect, a chip is provided, comprising a processor for calling and executing instructions stored in a memory from the memory, so that a communication device equipped with the chip executes the methods in the above aspects.

In the twelfth aspect, another chip is provided, comprising: an input interface, an output interface, a processor and a memory, wherein the input interface, the output interface, the processor and the memory are connected via an internal connection path, and the processor is used to execute the code in the memory. When the code is executed, the processor is used to execute the methods in the above aspects.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 shows a schematic diagram of a communication system according to an embodiment of the present application.

FIG2 shows a schematic flowchart of a method for transmitting downlink control information according to an embodiment of the present application.

FIG. 3 shows a schematic comparison diagram of the FDRA domain before and after a truncation operation is performed according to an embodiment of the present application.

FIG. 4 shows a schematic comparison diagram of the FDRA domain before and after another truncation operation is performed according to an embodiment of the present application.

FIG. 5 shows a schematic comparison diagram of the FDRA domain after another truncation operation is performed according to an embodiment of the present application.

FIG. 6 shows a schematic comparison diagram of the FDRA domain before and after another truncation operation is performed according to an embodiment of the present application.

FIG. 7 shows a schematic flowchart of another method for transmitting downlink control information according to an embodiment of the present application.

FIG8 shows a schematic block diagram of a device for transmitting downlink control information according to an embodiment of the present application.

FIG. 9 shows a schematic block diagram of another apparatus for transmitting downlink control information according to an embodiment of the present application.

DETAILED DESCRIPTION

The technical solution in this application will be described below in conjunction with the accompanying drawings.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, long-term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, fifth generation (5G) system (also known as new radio (NR)), etc.

It should also be understood that the technical solutions of the embodiments of the present application can also be applied to various communication systems based on non-orthogonal multiple access technology, such as sparse code multiple access (SCMA) system. Of course, SCMA may also be called other names in the communication field; further, the technical solutions of the embodiments of the present application can be applied to multi-carrier transmission systems using non-orthogonal multiple access technology, such as orthogonal frequency division multiplexing (OFDM), filter bank multi-carrier (FBMC), generalized frequency division multiplexing (GFDM), filtered orthogonal frequency division multiplexing (F-OFDM) system, etc.

It should also be understood that in the embodiment of the present application, the terminal device can communicate with one or more core networks via a radio access network (RAN), and the terminal device can be referred to as an access terminal, user equipment (UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The access terminal can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc.

It should also be understood that in an embodiment of the present application, the network device may be used to communicate with a terminal device, an evolutionary base station (evolutional node B, eNB or eNode B) in an LTE system, or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network side device in a future 5G network, or a network device in a future evolved PLMN network, etc.

The embodiments of the present application can be applicable to LTE systems and subsequent evolution systems such as 5G, or other wireless communication systems that adopt various wireless access technologies, such as systems that adopt code division multiple access, frequency division multiple access, time division multiple access, orthogonal frequency division multiple access, single carrier frequency division multiple access and other access technologies, and are particularly suitable for scenarios that require channel information feedback and/or the application of secondary precoding technology, such as wireless networks that apply Massive MIMO technology, wireless networks that apply distributed antenna technology, etc.

It should be understood that multiple-input multiple-output (MIMO) technology refers to the use of multiple transmitting antennas and receiving antennas at the transmitting device and the receiving device respectively, so that the signal is transmitted and received through the multiple antennas of the transmitting device and the receiving device, thereby improving the communication quality. It can make full use of spatial resources, realize multiple transmission and multiple reception through multiple antennas, and can multiply the system channel capacity without increasing spectrum resources and antenna transmission power.

MIMO can be divided into single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO). Massive MIMO is based on the principle of multi-user beamforming. Hundreds of antennas are arranged on the transmitting device, and the respective beams are modulated for dozens of target receivers. Through spatial signal isolation, dozens of signals are transmitted simultaneously on the same frequency resource. Therefore, Massive MIMO technology can make full use of the spatial freedom brought by large-scale antenna configuration and improve spectrum efficiency.

FIG. 1 is a schematic diagram of a communication system used in an embodiment of the present application. As shown in FIG. 1 , the communication system 100 includes a network device 102, and the network device 102 may include multiple antenna groups. Each antenna group may include one or more antennas, for example, one antenna group may include antennas 104 and 106, another antenna group may include antennas 108 and 110, and an additional group may include antennas 112 and 114. Two antennas are shown for each antenna group in FIG. 1 , but more or fewer antennas may be used for each group. The network device 102 may additionally include a transmitter chain and a receiver chain, and those of ordinary skill in the art will appreciate that they may all include multiple components related to signal transmission and reception, such as a processor, a modulator, a multiplexer, a demodulator, a demultiplexer, or an antenna, etc.

The network device 102 may communicate with a plurality of end devices, for example, the network device 102 may communicate with the end device 116 and the end device 122. However, it is understood that the network device 102 may communicate with any number of end devices similar to the end devices 116 or 122. The end devices 116 and 122 may be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable devices for communicating over the wireless communication system 100.

1 , terminal device 116 is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to terminal device 116 via forward link 118 and receive information from terminal device 116 via reverse link 120. In addition, terminal device 122 is in communication with antennas 104 and 106, where antennas 104 and 106 transmit information to terminal device 122 via forward link 124 and receive information from terminal device 122 via reverse link 126.

For example, in a frequency division duplex (FDD) system, forward link 118 may utilize a different frequency band than that used by reverse link 120 and forward link 124 may utilize a different frequency band than that used by reverse link 126, for example.

As another example, in a time division duplex (TDD) system and a full duplex system, forward link 118 and reverse link 120 may use a common frequency band, and forward link 124 and reverse link 126 may use a common frequency band.

Each group of antennas and/or area that is designed for communication is referred to as a sector of the network device 102. For example, the antenna group may be designed to communicate with terminal devices in a sector of the coverage area of the network device 102. During the communication between the network device 102 and the terminal devices 116 and 122 via the forward links 118 and 124, respectively, the transmit antennas of the network device 102 may utilize beamforming to improve the signal-to-noise ratio of the forward links 118 and 124. In addition, when the network device 102 utilizes beamforming to transmit signals to the terminal devices 116 and 122 that are randomly dispersed in the associated coverage area, mobile devices in adjacent cells may experience less interference than if the network device 102 transmits signals to all of its terminal devices via a single antenna.

At a given time, the network device 102, the terminal device 116, or the terminal device 122 may be a wireless communication transmitting device and/or a wireless communication receiving device. When transmitting data, the wireless communication transmitting device may encode the data for transmission. Specifically, the wireless communication transmitting device may obtain a certain number of data bits to be transmitted to the wireless communication receiving device via a channel. For example, the wireless communication transmitting device may generate, receive from other communication devices, or store in a memory a certain number of data bits to be transmitted to the wireless communication receiving device via a channel. Such data bits may be included in a transmission block or multiple transmission blocks of data, and the transmission block may be segmented to generate multiple code blocks.

In addition, the communication system 100 may be a public land mobile network PLMN network, a device to device (D2D) network, a machine to machine (M2M) network, or other networks. FIG. 1 is only a simplified schematic diagram for ease of understanding. The network may also include other network devices, which are not shown in FIG. 1 .

To facilitate understanding, the following is an introduction to the relevant terms involved in this article.

1. Bandwidth part (BWP)

The 3rd Generation Partnership Project (3GPP) standards organization is currently developing the protocol standards for the 5th Generation (5G) cellular mobile communication system, also known as new radio (NR). Compared with the long term evolution (LTE) system, the NR system has a feature that different bandwidths can be configured on the network side and the terminal side. The terminal device can configure its maximum working bandwidth according to its own business needs and manufacturing costs. For example, the working bandwidth of a low-cost, low-rate terminal device may be only 5MHz, while the working bandwidth of a high-rate, high-performance terminal device may reach 100MHz. If the carrier bandwidth of a cell is set according to the working bandwidth of a low-cost, low-rate terminal device (for example, set to 5MHz to 10MHz), the high-performance terminal device can only obtain a higher rate by using carrier aggregation, which is bound to increase the control signaling overhead and processing complexity; if the carrier bandwidth of the cell is set according to the working bandwidth of a high-rate, high-performance terminal device (for example, 100MHz), the low-cost terminal device must be equipped with RF and baseband devices suitable for large bandwidth to access the cell, which undoubtedly increases the cost. Therefore, NR introduces the concept of BWP.

A BWP is a continuous frequency resource on a cell carrier. The network can configure BWPs of different bandwidth sizes for different terminal devices. When a BWP is configured and activated, it is called an activated BWP (activeBWP). The data and control information sent uplink or received downlink by the terminal device will be limited to the active BWP. The current protocol supports a terminal device to transmit data only on one activated BWP. The BWP allocated to the terminal device at the time of initial access is called the initial BWP (initial BWP). The identifier of the initial BWP, for example, takes a value of 0.

2. Blind inspection

The DCI that schedules different data transmissions can be scrambled with different radio network temporary identifiers (RNTI). For example, the RNTI may include a cell identifier (C-RNTI), an access identifier (RA-RNTI), a paging identifier (P-RNTI), etc., wherein C-RNTI can be used to scramble the DCI that schedules user data, RA-RNTI can be used to scramble the random access response message sent by the scheduling network device to the terminal device, and P-RNTI can be used to scramble the paging message.

Taking C-RNTI as an example, the physical downlink control channel (PDCCH) of different users can be distinguished by their corresponding C-RNTI, that is, the cyclic redundancy check (CRC) of DCI is masked by C-RNTI. Users generally do not know the format of the currently sent DCI, nor do they know which alternative PDCCH the DCI they need is on. However, users know what information they are currently expecting. For different expected information, users use the corresponding RNTI and the information on the configured alternative PDCCH to perform CRC check. If the CRC check is successful, then the user knows that this DCI information is what he needs, and also knows the corresponding DCI format, so as to further parse the content of the DCI.

In a possible implementation, the number of blind detections is calculated as follows:

(1) When the DCI lengths on the candidate PDCCH are different, a blind detection is counted separately;

(2) DCI on candidate PDCCH composed of different control channel elements (CCE) is counted as one blind detection.

(3) The DCI of the candidate PDCCH from different control resource sets (CORESET) is counted as one blind detection. CORESET represents the time-frequency resource set used to carry control information.

(4) If the DCI lengths on the candidate PDCCHs in the same CORESET and the same CCE set are the same, it is counted as one blind detection.

3. DCI format

For data transmission, NR currently supports four formats of DCI, namely DCI format 0_0, DCI format 0_1, DCI format 1_0 and DCI format 1_1.

According to uplink and downlink, the above four formats of DCI can be divided into two categories: DCI used to schedule the physical uplink shared channel (PUSCH) and DCI used to schedule the physical downlink shared channel (PDSCH), among which DCI format 0_0 and DCI format0_1 are DCI used to schedule PUSCH, and DCI format 1_0 and DCI format 1_1 are DCI used to schedule PDSCH.

According to the specific functions, the above four formats of DCI can also be divided into two categories: fallback DCI and non-fallback DCI, where DCI format 0_0 and DCI format 1_0 are fallback DCI, and DCI format 0_1 and DCI format 1_1 are non-fallback DCI. It should be understood that the field contents and corresponding DCI bit widths contained in different formats of DCI are different.

During the radio resource control (RRC) reconfiguration process, there will be a period of time when the network device and the terminal device have inconsistent understandings of the effective time of the new configuration. During this period of time, the network device can send a fallback DCI to the terminal device for data scheduling, thereby avoiding inconsistent understandings of the RRC configuration between the network device and the terminal device. In other words, if the network device does not configure the transmission mode for the terminal device through high-level signaling, it is mainly the time period after the initial access until the RRC configuration is completed and effective. Since the terminal device cannot receive any configuration information indicated by RRC signaling during this period, the protocol needs to predefine a transmission mechanism, namely single-port transmission based on fallback DCI scheduling, mainly because this transmission mechanism does not rely on RRC signaling, and the parameters required for transmission can be indicated by DCI signaling to complete data transmission.

It should be understood that the above-mentioned fallback DCI and non-fallback DCI are merely names used to distinguish two types of DCI with different functions. Other names may also be used to describe them, and the embodiments of the present application are not limited to this.

In a possible implementation, the formats of the above four DCIs may be respectively shown in the following table:

Table 1 DCI format 0_0

In the above DCI format 0_0, except for the FDRA field, the lengths of the remaining fields are fixed and do not need to be configured through RRC signaling. Therefore, the information bit size of DCI format 0_0 is only related to the FDRA field. It is related to the value of .

Table 2 DCI format 0_1

In the above DCI format 0_1, in addition to the FDRA field, there are many fields whose lengths are not fixed and need to be configured through RRC signaling, such as carrier indication bit, bandwidth part indication, time domain resource allocation bit, etc. Therefore, the information bit size of DCI format 0_1 is not only related to It is related to the value of and is flexible.

Table 3 DCI format 1_0

The above DCI format 1_0 is a DCI format that uses C-RNTI scrambling and the FDRA field is not all 1, or a DCI format that uses CS-RNTI scrambling. In this DCI format 1_0, except for the FDRA field, the lengths of the remaining fields are fixed and do not need to be configured through RRC signaling. Therefore, the information bit size of DCI format 0_1 is only related to the FDRA field. The FDRA field of DCI format 0_1 is only related to It is related to the value of .

Table 4 DCI format 1_1

In the above DCI format 1_1, in addition to the FDRA field, there are many fields whose lengths are not fixed and need to be configured through RRC signaling, such as carrier indication bit, bandwidth part indication, time domain resource allocation bit, etc. Therefore, the information bit size of DCI format_1 is not only related to It is related to the value of and is flexible.

In summary, in the fallback DCI, except for the FDRA field, the bit length and content of other fields are not affected by the RRC configuration and are fixed. Therefore, the only factor that affects the fallback DCI bit length is the length of the FDRA field. Specifically, the parameters that affect the length of DCI format 0_0 are The parameters that affect the length of DCI format 1_0 are and You can use the initial uplink BWP (initial UL BWP) or the active uplink BWP (active ULBWP). Similarly, The initial downlink BWP or the activated downlink BWP may be used, depending on the scenario to which the DCI corresponds, such as a common search space (CSS) or a user-specific search space (USS), which results in DCI format 0_0 and DCI format 1_0 having two lengths, respectively.

4. DCI size budget

The DCI length budget needs to meet the following two judgment conditions at the same time, namely:

(1) The number of different DCI lengths in a time slot within a cell shall not exceed 4;

(2) The number of different DCI lengths scrambled by C-RNTI monitored in one time slot in one cell shall not exceed three.

Tables 5 and 6 show the different scenarios. and The value of .

Table 5 DCI format 0_0

Table 6 DCI format 1_0

Specifically, for DCI format 0_0, in the CSS, the FDRA field Using the initial UL BWP calculation, in USS, if the DCI length budget is met, the FDRA field Using active UL BWP calculation, if the DCI length budget is not met, the FDRA field Use the initial UL BWP calculation. For DCI format0_1, in the CSS, the FDRA field Using the initial DL BWP calculation, in USS, if the DCI length budget is met, the FDRA field Using active DL BWP calculation, if the DCI length budget is not met, the FDRA field Use initial DL BWP calculation.

Since the network device may also send other formats of DCI to the terminal device in one time slot, for example, DCI format 0_1 with C-RNTI scrambled CRC, DCI format 1_1 with C-RNTI scrambled CRC, DCI format 2_0 with SFI-RNTI scrambled CRC, DCI format 2_1 with INT-RNTI scrambled CRC, etc. In order to avoid the high blind detection complexity of the terminal device in one time slot, the network device and the terminal device need to align the lengths of DCI format0_0 and DCI format 1_0 in CSS and USS according to the DCI length budget.

In a possible implementation, within one time slot, the network device needs to send two DCIs of different lengths to the terminal device, namely, DCI format 0_1 with C-RNTI scrambled CRC and DCI format1_1 with C-RNTI scrambled CRC. At this time, since DCIs of other formats occupy a portion of the DCI length budget, there are still two length budgets left for sending C-RNTI scrambled DCIs of different lengths, while there is only one length budget left for sending DCIs of different lengths. Because both conditions must be met at the same time, there is still one DCI length budget left. If DCI format0_0 and DCI format 1_0 are to be sent in CSS and USS, it is necessary to align these two different lengths of DCI into one length of DCI through alignment rules.

5. Frequency Domain Resource Allocation FDRA Domain

Frequency domain resource allocation is divided into two types: resource allocation type 0 and resource allocation type 1. Resource allocation type 0 does not support frequency hopping, and resource allocation type 1 is divided into two types: supporting frequency hopping and not supporting frequency hopping. Therefore, the network device can indicate to the terminal device whether frequency hopping is supported through the frequency hopping flag in the downlink control information (DCI).

Specifically, if the frequency hopping flag indicates that frequency hopping is supported, the frequency domain resource assignment (FDRA) field of the DCI consists of two parts: the frequency hopping offset indication bit (the frequency offset) and the actual frequency domain resource allocation indication bit (frequency domain resource allocation). The highest bit or 2 bits indicate the size of the frequency hopping offset, and the remaining number of bits indicates resource allocation. If the frequency hopping flag indicates that frequency hopping is not supported, the entire frequency domain allocation indication field indicates resource allocation, and there is no frequency hopping offset indication bit.

Since there may be a frequency hopping offset indication bit in the FDRA domain, the above-mentioned actual frequency domain resource allocation indication bit represents the bit actually used to indicate the frequency domain resource allocation in addition to the frequency hopping offset indication bit in the FDRA domain. It should be understood that this application is only for the purpose of distinguishing the bits actually used to indicate the frequency domain resource allocation in the "frequency domain resource allocation FDRA domain" and the "frequency domain resource allocation FDRA domain", and these bits are referred to as "actual frequency domain resource allocation indication bits". These bits may also have other names, which are not limited in the embodiments of this application.

In one possible implementation, the number of bits in the FDRA field of DCI format 0_0 is The number of bits of the frequency hopping offset indication bit is N _{UL_hop} . When the frequency hopping offset indication bit indicates 2 frequency hopping offsets, N _{UL_hop} = 1. When the frequency hopping offset indication bit indicates 4 frequency hopping offsets, N _{UL_hop} = 2. In addition to the N _{UL_hop} bits of the frequency hopping offset indication bit, the remaining bits in the FDRA field are bits are used to indicate the actual frequency domain resource allocation, which is referred to as the “actual frequency domain resource allocation indication bit” in this article.

Since there are many different lengths of DCI, in the process of transmitting DCI between network devices and terminal devices, it may be necessary to perform a truncation operation on the FDRA fields of DCI of different lengths so that the lengths of DCI can be aligned, and the number of DCIs of different lengths can be reduced, thereby reducing the blind detection complexity of DCI by terminal devices. The current method is to start truncation from the highest bit of the FDRA field of DCI. Due to the truncation operation, all or part of the bits of the frequency hopping offset indication bit in the DCI will be truncated. Such an operation is not flexible enough, and the terminal device cannot know whether to perform the frequency hopping operation.

In view of this, an embodiment of the present application proposes a new method for transmitting downlink control information, which can reduce the blind detection complexity of the terminal device for DCI.

Fig. 2 shows a schematic flow chart of a method 200 for transmitting downlink control information according to an embodiment of the present application. The method 200 can be applied to the communication system 100 shown in Fig. 1, but the embodiment of the present application is not limited thereto.

S210, the network side device sends first configuration information to the terminal side device, where the first configuration information is used to configure the search space, and correspondingly, the terminal side device receives the first configuration information sent by the network side device;

S220, the network side device sends the first DCI and/or the second DCI to the terminal side device;

S230: The terminal side device detects the first DCI and the second DCI in the search space configured by the first configuration information according to the first configuration information, where the first DCI includes:

the first field and the truncated second field; or

the first field and the second field are truncated; or

the truncated first field and the truncated second field;

The first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

The method for transmitting downlink control information in an embodiment of the present application transmits a second DCI and a first DCI having the same number of bits as the second DCI through a network side device and a terminal side device, which can reduce the blind detection complexity of the terminal side device, thereby improving system performance.

It should be understood that the terminal side device of the embodiment of the present application can be a terminal device itself sold independently, or it can be a chip in the terminal device, and the network side device can be a network device itself sold independently, or it can be a chip in the network device, and the embodiment of the present application is not limited to this.

Specifically, the network side device can send the first configuration information for configuring the search space to the terminal side device, and the first configuration information can be sent by the network side device to the terminal side device through high-level signaling. Then, the terminal side device can detect the DCI sent by the network side device in the search space configured by the first configuration information. Since the terminal side device does not know the format of the DCI currently sent by the network side device, nor does it know on which alternative PDCCH the DCI it needs is, but the terminal side device knows the information it expects. Therefore, the terminal side device can perform blind detection. In a possible implementation method, the terminal side device uses the RNTI corresponding to the DCI format it expects and the information on the configured alternative PDCCH to perform a CRC check. If the CRC check is successful, then the terminal side device knows that the DCI information is what it needs, and also knows the corresponding DCI format, so as to further parse the content of the DCI.

In the embodiment of the present application, the number of DCI bits refers to the number of bits of the entire DCI that the terminal side device needs to perform blind detection. It should be understood that the number of DCI bits is equal to the number of bits remaining after the DCI information bits are truncated or the number of DCI information bits plus the number of supplemented zero bits, wherein the number of DCI information bits is the number of information bits before the DCI is padded or truncated. If a truncation operation is performed on the DCI, the number of DCI bits is equal to the number of bits remaining after the DCI information bits are truncated. If a zero padding operation is performed on the DCI, the number of DCI bits is equal to the number of DCI information bits plus the number of supplemented zero bits.

In order to reduce the blind detection complexity of the terminal side device, the network side device needs to perform a truncation operation on the longer DCI of the two types of DCIs of different lengths, so as to ensure that only one type of DCI is sent. In this way, the terminal side device only needs to perform blind detection according to this length, and the complexity is relatively low. Specifically, the above-mentioned first DCI is the DCI generated after the network side device performs the truncation operation, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

The network side device can generate the first DCI through different operation modes, so there may be multiple situations for the fields in the first DCI, which is not limited in the embodiments of the present application. As an optional embodiment, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

The above-mentioned "truncation" may refer to deleting part of the information bits of the corresponding field, or may refer to deleting all the information bits of the corresponding field. In an embodiment of the present application, part of the information bits may be truncated from the first field for indicating resource allocation, and all or part of the information bits may be truncated from the second field for indicating the frequency hopping offset. The network side device may adopt different operation modes, for example, all or part of the information bits are truncated from the second field for indicating the frequency hopping offset, that is, the first DCI includes the first field and the truncated second field; for another example, part of the information bits are truncated from the first field for indicating resource allocation, that is, the first DCI includes the truncated first field and the second field; for another example, the first field for indicating resource allocation and the second field for indicating the frequency hopping offset are both truncated, wherein part of the information bits are truncated from the first field, and all or part of the information bits are truncated from the second field, that is, the first DCI includes the truncated first field and the truncated second field.

Optionally, after detecting that the first DCI is the DCI required by the terminal side device, the terminal side device can parse (decode) the first DCI. Specifically, the terminal side device can determine which of the above three situations the first DCI includes according to the operation performed by the network side device, that is, the first DCI includes the first field and the truncated second field, or the first DCI includes the truncated first field and the second field, or the first DCI includes the truncated first field and the truncated second field.

The terminal side device can further determine the number of bits of the second field to determine whether the second field has been completely intercepted. In the case where the number of bits of the truncated second field is greater than 0, the second field used to indicate the frequency hopping offset is not completely intercepted, and the terminal side device determines that a frequency hopping operation needs to be performed on the downlink data, and further determines the frequency hopping offset based on the second field. In the case where the number of bits of the truncated second field is equal to 0, all information bits of the second field used to indicate the frequency hopping offset are intercepted. At this time, even if the frequency hopping flag indicates frequency hopping, the terminal side device may not perform a frequency hopping operation on the downlink data, that is, directly parse the first field in the first DCI.

It should be understood that the "field" herein refers to a number of bits with a certain physical meaning, and multiple fields can constitute a domain. In a possible implementation, the first field in the embodiment of the present application can be a frequency domain resource allocation indication bit (frequency domain resource allocation) in the DCI, and the second field can be a frequency hopping offset indication bit (the frequency offset), and the first field and the second field can constitute a frequency domain resource allocation indication (frequency domain resource assignment, FDRA) domain in the DCI, but the embodiment of the present application is not limited to this.

As an optional embodiment, the method further includes: when at least one of the following conditions is met, the network side device determines that the first DCI includes the truncated first field and the second field, and correspondingly, when at least one of the following conditions is met, the terminal side device determines that the first DCI includes the truncated first field and the second field:

The number of bits of the first field that are truncated is less than or equal to a first threshold;

The number of bits of the truncated first field is greater than a second threshold;

The bandwidth of the initial uplink bandwidth portion is greater than a third threshold;

The network side device configures the terminal side device to perform transmission precoding through high-level signaling.

The network device and the terminal device need to have the same understanding of the truncation operation to ensure that when the network device performs a truncation operation on the DCI, the terminal device has a correct understanding when receiving the DCI, otherwise, it will cause DCI field parsing errors. Specifically, the network side device can determine whether to perform a truncation operation on the above-mentioned second field based on at least one of the information such as the number of bits truncated by the first field, the number of bits of the first field that are truncated, the bandwidth of the initial uplink bandwidth part, and whether the network side device configures the terminal side device to perform transmission precoding (transform precoder). Correspondingly, the terminal side device can determine the fields included in the first DCI based on at least one of the above information. In this way, the terminal side device and the network side device can make judgments based on the same information, thereby ensuring that the understanding of the terminal side device and the network side device is consistent and error-prone.

In an embodiment of the present application, the network side device retains the frequency hopping bit when performing a truncation operation. In this way, the truncation operation will not cause the terminal side device to be unable to frequency hop. The terminal side device can obtain frequency diversity gain through frequency hopping to ensure the performance of users at the edge of the cell.

If the number of bits of the first field being truncated is less than or equal to the first threshold, it indicates that the network side device does not truncate the second field. In other words, if the number of bits of the first field being truncated is greater than the second threshold, it indicates that the network side device does not truncate the second field.

This is because when the number of bits to be intercepted is too small, only the first field is intercepted to ensure frequency hopping. If the number of bits to be intercepted is too large, only the first field is intercepted, which will lead to waste of resource allocation indication bits and loss of more indication resources. In this case, the second field can also be truncated.

If the bandwidth of the initial uplink bandwidth part is greater than the third threshold, it indicates that the network side device does not truncate the second field and retains the frequency hopping bit. This is because only when the bandwidth of the initial uplink bandwidth part is large enough can frequency hopping bring a certain diversity gain. Otherwise, if the bandwidth of the initial uplink bandwidth part is not large enough, the frequency hopping gain is too small and meaningless.

The above-mentioned first threshold, second threshold and third threshold are predefined values, or values configured by the network side device for the terminal side device through signaling, and the embodiments of the present application do not limit this.

If the network side device configures the terminal side device to perform transmission precoding through high-level signaling, it indicates that the network side device does not truncate the second field.

Specifically, the function of the transmission precoder is to perform discrete Fourier transform (DFT) on the data after layer mapping (layer mapper) in the physical layer process to convert it into frequency domain data. Through DFT, the uplink data can be dispersed in the entire frequency domain, thereby reducing the peak to average power ratio (PAPR) of the signal.

In a possible implementation, the specific form of transmission precoding applied to data can be shown as follows:

After transmission precoding, a set of complex value symbols can be obtained In the above formula, Represents the number of modulation symbols on each layer; l represents the lth OFDM symbol; Indicates how many subcarriers are included in the PUSCH transmission; Indicates the number of subcarriers in a resource block (RB), and the value is 12; Indicates the bandwidth for sending PUSCH, in RB units, satisfying Where α ₂ , α ₃ , α ₅ are a set of non-zero integers.

It should be understood that when the network side device configures the terminal side device to enable transmission precoding (transformPrecoder) through high-level signaling, the uplink transmission of the terminal side device will adopt a discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) waveform.

When the network side device configures the transmission precoding enable, the network side device can retain the frequency hopping bit, otherwise the frequency hopping bit can be intercepted. In other words, when the DFT-s-OFDM waveform is used on the initial uplink bandwidth part, the network side device can retain the frequency hopping bit, otherwise the frequency hopping bit can be intercepted. This is because when the DFS-s-OFDM waveform is used on the initial uplink bandwidth part, the uplink coverage of the terminal side device is limited, and enabling frequency hopping can ensure uplink coverage.

It should be understood that the limited uplink coverage is due to the limited dynamic range of general power amplifiers. Signals with large peak-to-average ratios can easily enter the nonlinear region of the power amplifier, causing nonlinear distortion of the signal, resulting in significant spectrum spread interference and in-band signal distortion, which seriously degrades the performance of the entire system. Therefore, in order to ensure that the terminal-side equipment works in the linear region, additional power is required for power backoff, resulting in a reduction in the power used for coverage.

As an optional embodiment, the first DCI is generated by any one of the following operation modes:

An operation mode of truncating from the most significant bit of the first field;

An operation mode of truncating from the most significant bit of the second field;

An operation mode of truncating part of the information bits of the second field, and then truncating from the highest bit of the first field.

Specifically, the network side device may truncate from the highest bit of the first field, or from the highest bit of the second field, or first truncate some information bits of the second field, and then truncate from the highest bit of the first field. It should be understood that the second field is located before the first field.

For the operation mode of truncating from the highest bit of the first field, the second field always exists and is not truncated, that is, the first DCI includes the truncated first field and the second field.

For the operation mode of truncating from the highest bit of the second field, the first field may be truncated or not, but if the first field is truncated, it proves that the second field has been completely truncated, and the number of bits of the truncated second field is 0, that is, the first DCI includes the first field and the truncated second field, or the first DCI includes the truncated first field and the truncated second field.

For the operation mode of first truncating part of the information bits of the second field and then truncating from the highest bit of the first field, the second field is partially truncated, and the number of bits of the second field after truncation is greater than 0. The first field may be truncated or may not be truncated. Then the first DCI includes the first field and the truncated second field, or the first DCI includes the truncated first field and the truncated second field.

In this way, the network side device can adopt the above different operations according to different requirements, which greatly improves the flexibility of transmitting downlink control information.

As an optional embodiment, the method further includes:

The network side device sends second configuration information to the terminal side device, where the second configuration information indicates the operation mode adopted for the first DCI, and correspondingly, the terminal side device receives the second configuration information sent by the network side device;

The terminal side device detects the first DCI and the second DCI in the search space according to the first configuration information, including:

The terminal side device detects the first DCI and the second DCI in the search space according to the first configuration information and the second configuration information.

Specifically, the network side device can send the second configuration information to the terminal side device to indicate the operation mode adopted for the first DCI, and the operation mode can be any one of the above three operation modes. After receiving the high-level signaling, the terminal side device can perform blind detection according to the operation mode configured by the network side device. Optionally, the above second configuration information can be sent by the network side device to the terminal side device through high-level signaling.

In another possible implementation, the above operation mode may be agreed upon in a protocol.

For example, the first DCI format is DCI format 0_0 before being truncated, and the second DCI format is DCI format 1_0. Assuming that the length of DCI format 0_0 is greater than that of DCI format 1_0, in the process of aligning the length of DCI format 0_0 to DCI format 1_0, the network side device needs to intercept the FDRA field of DCI format 0_0, and the intercepted bit length is the difference between the length of DCI format 0_0 and the length of DCI format 1_0.

3 to 6, the method for transmitting downlink control information of the present application is described in detail by taking the frequency hopping offset indication bit as 2 bits as an example. It should be understood that the frequency hopping offset indication bit corresponds to the second field, and the actual frequency domain resource allocation indication bit corresponds to the first field.

Embodiment 1

In this embodiment, the network device intercepts from the highest bit of the FDRA field, which may result in two results, as shown in FIG. 3 and FIG. 4 .

As shown in Figure 3, if only 1 bit needs to be cut off, there will be 1 bit left in the frequency hopping offset indication bit after the cut-off operation is completed. Then, when the terminal device sends uplink data, it can perform frequency hopping according to the size indicated by the frequency hopping offset indicated by 1 bit. In this case, the network device originally configured 4 frequency hopping offsets for the terminal through high-level signaling, and the frequency hopping offset indication bit is 2 bits. When one bit is cut off, the network device can only indicate 2 frequency hopping offsets from the 4 frequency hopping offsets through the cut-off DCI.

In a possible implementation, the above 2 bits can indicate 00, 01, 10, 11, corresponding to the above 4 frequency hopping offsets. When the network device cuts off 1 bit from the highest bit, the remaining 1 bit can only indicate 0 and 1. At this time, the network device and the terminal device can default their previous values to 0 or 1, so that 00 and 01, or 10 and 11, are obtained, indicating 2 frequency hopping offsets of the above 4 frequency hopping offsets respectively.

As shown in FIG4 , all the frequency hopping offset indication bits are truncated, and only 2 frequency hopping offset indication bits may be truncated, or, in addition to truncating 2 frequency hopping offset indication bits, a part of the actual frequency domain resource allocation indication bits are also truncated. In this case, the terminal device does not perform frequency hopping when sending uplink data.

Embodiment 2

In this embodiment, the network device always reserves the frequency hopping offset indication bit, and only truncates the highest bit of the actual frequency domain resource allocation indication bit until it is aligned with the length of DCI format 1_0.

As shown in Figure 5, no matter how many bits need to be truncated, the network device always starts truncating from the highest bit of the actual frequency domain resource allocation indication bit. In this way, when sending uplink data, the terminal device can always perform frequency modulation operations according to the 4 frequency modulation offsets indicated by the frequency modulation offset indication bit.

Embodiment 3

In this embodiment, the network device intercepts 1 bit of the frequency hopping offset indication bit and retains 1 bit of the frequency hopping offset indication bit. If further truncation is required, truncation starts from the highest bit of the actual frequency domain resource allocation indication bit.

As shown in Figure 6, the network device performs interception operations on both the frequency hopping offset indication bit and the actual frequency domain resource allocation indication bit. The frequency modulation offset indication bit is changed from 2 bits to 1 bit. Then, when the terminal device sends uplink data, it can perform frequency hopping according to the size indicated by the frequency hopping offset indicated by 1 bit. As in the first embodiment, the network device needs to select 2 frequency hopping offsets from the 4 frequency hopping offsets configured for the terminal.

It should be understood that the truncation operations corresponding to the above three embodiments may be agreed upon by the protocol, or at least one of them may be configured by the network side device to the terminal side device through high-level information.

In another possible implementation, the network side device and the terminal side device may determine whether to use the truncation operation corresponding to the first embodiment or the truncation operation corresponding to the second embodiment (or the third embodiment) according to any one of the following conditions:

1. For the number of bits intercepted from the FDRA field, if the number of bits intercepted from the FDRA field is greater than a preset threshold, the truncation operation corresponding to the second embodiment (or the third embodiment) is adopted; otherwise, the truncation operation corresponding to the first embodiment is adopted;

2. The number of bits remaining after the FDRA field is truncated. If the number of bits remaining after the FDRA field is truncated is less than a preset threshold, the truncation operation corresponding to the second embodiment (or the third embodiment) is adopted; otherwise, the truncation operation corresponding to the first embodiment is adopted;

3. The number of bits of the actual frequency domain resource allocation indication bit after truncation of the FDRA domain. If the number of bits of the actual frequency domain resource allocation indication bit after truncation is less than a preset threshold, the truncation operation corresponding to Embodiment 2 (or Embodiment 3) is adopted; otherwise, the truncation operation corresponding to Embodiment 1 is adopted.

4. The bandwidth of the initial uplink bandwidth part. If the bandwidth of the initial uplink bandwidth part is greater than a preset threshold, the truncation operation corresponding to the second embodiment (or the third embodiment) is adopted. Otherwise, the truncation operation corresponding to the first embodiment is adopted.

5. Whether transmission precoding is enabled. If the network side device is configured to enable transmission precoding, the truncation operation corresponding to the second embodiment (or the third embodiment) is adopted. Otherwise, the truncation operation corresponding to the first embodiment is adopted.

The method for transmitting downlink control information in an embodiment of the present application generates a first DCI with the same number of bits as a second DCI by adopting different operating modes through a network side device. While reducing the blind detection complexity of a terminal side device, it has high flexibility and can ensure consistent understanding between the network side device and the terminal side device.

For fallback DCI, FDRA domain and The length of DCI is different with different values, and the details can be seen in Table 5 and Table 6. In view of this, the present application proposes another method for transmitting downlink control information, which can reduce the blind detection complexity of DCI by terminal equipment.

Fig. 7 shows a schematic flow chart of another method 700 for transmitting downlink control information according to an embodiment of the present application. The method 700 can be applied to the communication system 100 shown in Fig. 1, but the embodiment of the present application is not limited thereto.

S710, the network side device determines the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI;

S720, the terminal side device determines the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI;

S730, the network side device sends at least one of the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space;

S740, the terminal side device detects the first DCI, the second DCI, the third DCI and the fourth DCI in the search space.

Specifically, there are four DCIs whose lengths may be different from each other. In order to reduce the blind detection complexity of the terminal side device, the network side device may perform an alignment operation on the DCI before sending. The alignment operation may be a zero padding operation or a truncation operation. The first DCI, the second DCI, the third DCI and the fourth DCI are DCIs after the alignment operation is performed on the four DCIs whose lengths may be different from each other.

For method 700, in one possible implementation, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, the third DCI is generated according to the initial uplink bandwidth part and has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, and the fourth DCI is generated according to the initial downlink bandwidth part and has the same number of bits as the second DCI.

In an embodiment of the present application, the number of bits of the first DCI, the second DCI, the third DCI and the fourth DCI is the same, so that the terminal side device can blindly detect the DCI according to a certain length in the search space configured by the network side device.

It should be understood that the third DCI is generated by activating the uplink bandwidth part before the zero padding operation or the truncation operation is performed. Since it needs to be aligned with the second DCI, the network side device can first replace the activated uplink bandwidth part with the initial uplink bandwidth part, and then perform the zero padding operation or the truncation operation on the replaced DCI to generate the third DCI. Similarly, the fourth DCI is generated by activating the downlink bandwidth part before the zero padding operation or the truncation operation is performed. Since it needs to be aligned with the second DCI, the network side device can directly replace the activated downlink bandwidth part with the initial downlink bandwidth part to generate the fourth DCI.

The method for transmitting downlink control information in an embodiment of the present application aligns the DCI through a network side device, and the terminal side device detects the DCI in the corresponding search space in the same manner, which can reduce the blind detection complexity of the terminal side device for the DCI, thereby improving the system performance.

As an optional embodiment, the first DCI is a DCI format 0_0 in a common search space (CSS);

The second DCI is DCI format 1_0 in the CSS;

The third DCI is DCIformat0_0 in a user-specific search space (UE-specific search space, USS);

The fourth DCI is DCI format 1_0 in the USS.

Specifically, the terminal side device performs blind detection in the search space for the above-mentioned different formats of DCI. The search space defines the starting position of the blind detection and the channel search method. The search space can be divided into a common search space CSS and a user-specific search space USS. Among them, CSS is a group of terminal side devices or all terminal side devices in the same cell that need to be detected, while USS is for specific terminal side devices.

For method 700, in another possible implementation, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, and the third DCI has the same number of bits as the fourth DCI generated according to the activated uplink bandwidth portion and through a zero-padding operation.

In an embodiment of the present application, the number of bits of the first DCI and the second DCI is the same, and the number of bits of the third DCI and the fourth DCI is the same. In this way, the terminal side device can blindly detect DCI according to two lengths in the search space configured by the network side device.

It should be understood that the number of bits of the third DCI before the zero padding or truncation operation is performed is less than the number of bits of the fourth DCI. Therefore, it is only necessary to perform the zero padding operation on the third DCI to ensure that the number of bits of the third DCI and the fourth DCI are the same.

The method for transmitting downlink control information in an embodiment of the present application aligns the DCI through a network side device, and the terminal side device detects the DCI in the corresponding search space in the same manner, which can reduce the blind detection complexity of the terminal side device for the DCI, thereby improving the system performance.

As an optional embodiment, the first DCI is a DCI format format0_0 in a common search space CSS;

The second DCI is DCI format 1_0 in the CSS;

The third DCI is a DCI format 0_0 in a user specific search space USS;

The fourth DCI is DCI format 1_0 in the USS.

The method for transmitting downlink control information of the present application is described in detail below through a specific embodiment. Among them, the first DCI is DCI format 0_0 in CSS, the second DCI is DCI format 1_0 in CSS, and the third DCI is DCI format 0_0 in USS ( The fourth DCI is DCI format1_0 in USS ( (Calculated using the activated downstream bandwidth portion).

Embodiment 4

The network side device sends the configuration information of the downlink control information to the terminal side device, including the search space, resource control set, etc. After receiving the configuration information, the terminal side device can determine which specific RNTI-scrambled DCI format and DCI length to monitor in which time slots according to the configuration information.

Within a given transmission time unit (for example, a time slot in NR), the terminal side device determines the number of remaining DCI length budgets based on the specific DCI format and DCI length encrypted by all specific RNTIs that need to be monitored, and then determines the blind detection method for DCI.

Before sending DCI, the network side device can perform the following alignment operations on the above four types of DCI in two situations.

Case 1: When there is only one DCI length budget:

1. The network side device aligns the length of the first DCI with the length of the second DCI;

2. The network-side device changes the calculation of the FDRA field of the third DCI from the activated uplink bandwidth part to the initial uplink bandwidth part, and then aligns it to the length of the second DCI;

3. The network side device changes the FDRA field calculation of the fourth DCI from the activated downlink bandwidth part to the initial downlink bandwidth part, so that the length of the aligned fourth DCI is the same as the length of the second DCI.

In this way, when the terminal side device determines that there is only one DCI length budget, it can detect the above-mentioned first DCI, second DCI, third DCI and fourth DCI according to one length (ie, the length of the second DCI).

Case 2: When there are only two DCI length budgets:

1. The network side device aligns the length of the first DCI with the length of the second DCI;

2. The network side device aligns the length of the third DCI and the length of the fourth DCI with the longer DCI length.

In this way, when the terminal side device determines that there is only one DCI length budget, it can detect the above-mentioned first DCI, second DCI, third DCI and fourth DCI according to two lengths (i.e., the longer length of the second DCI, the third DCI and the fourth DCI).

Embodiment 5

The network side equipment and the terminal side equipment can follow the definition of DCI length budget, that is, they need to meet the following two judgment conditions at the same time:

(1) The number of different DCI lengths in a time slot within a cell shall not exceed 4;

(2) The lengths of different DCIs scrambled by the C-RNTI monitored in one time slot in one cell shall not exceed three; and the alignment method of the DCI shall be determined.

The network side device and the terminal side device can first determine the number of remaining DCI length budgets based on the CSS. Specifically, assuming that there are DCI format 2_0, DCI format 0_0 and DCI format 0_1, CSS DCI format 0_0 and CSS DCI format 0_1 are aligned, which accounts for a total of 2 length budgets and 1 C-RNTI length budget.

The network side device and the terminal side device can then determine the number of remaining DCI length budgets based on the USS.

In case 1, USS DCI format 0_1 and USS DCI format 1_1 have the same length, occupying 1 length budget and 1 length budget of C-RNTI, leaving only 1 length budget and 1 length budget of C-RNTI.

Therefore, USS DCI format 0_0 and USS DCI format 1_0 can only output one length in total. Assuming that the DCI length budget is met, after all operations that meet the budget conditions are performed, that is, the FDRA field of USS DCI format 0_0 uses the activated BWP, the FDRA field of USS DCI format 1_0 uses the activated BWP, and the two DCIs are aligned to the longer length, then a new length is output.

Case 2: USS DCI format 0_1 and USS DCI format 1_1 have different lengths, occupying 2 length budgets and 2 C-RNTI length budgets, leaving only 0 length budget and 0 C-RNTI length budget:

In this case, the 2 DCIs in the USS cannot be output together with a DCI length different from before.

Assuming that the DCI size budget is met, first complete all operations that meet the budget conditions, that is, USS 0_0active, USS1_0active, and align the two DCIs in USS to the longer length, then output 1 length. Then determine whether the budget conditions are met. If not, USS 0_0initial UL, USS 1_0initial DL, and USS 0_0initial UL are aligned to CSS 1_0initial DL.

It should be understood that the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The above is described in detail in combination with Figures 1 to 7, and the device for transmitting downlink control information according to an embodiment of the present application will be described in detail in combination with Figures 8 to 9.

FIG8 shows an apparatus 800 for transmitting downlink control information provided in an embodiment of the present application, the apparatus 800 may be a terminal device or a chip in a terminal device, the apparatus may be a network device or a chip in a network device. The apparatus 800 includes: a transceiver unit 810 and a processing unit 820.

In a possible implementation, the apparatus 800 is used to execute various processes and steps corresponding to the terminal side device in the above method 200.

The transceiver unit 810 is used to: receive first configuration information sent by a network side device, wherein the first configuration information is used to configure a search space; the processing unit 820 is used to: detect first downlink control information DCI and second DCI in the search space according to the first configuration information, wherein the first DCI includes: a first field and a truncated second field; or a truncated first field and a truncated second field; or a truncated first field and a truncated second field; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

Optionally, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

Optionally, the processing unit 820 is further used to: determine that the first DCI includes the truncated first field and the second field when at least one of the following conditions is met: the number of truncated bits of the first field is less than or equal to a first threshold; the number of bits of the truncated first field is greater than a second threshold; the bandwidth of the initial uplink bandwidth part is greater than a third threshold; the network side device configures the terminal side device to perform transmission precoding through high-level signaling.

Optionally, the first DCI is generated by any one of the following operation modes: an operation mode of truncating from the highest bit of the first field; an operation mode of truncating from the highest bit of the second field; an operation mode of truncating part of the information bits of the second field and then truncating from the highest bit of the first field.

Optionally, the transceiver unit 810 is also used to: receive second configuration information sent by the network side device, the second configuration information indicating the operation mode adopted for the first DCI; the processing unit 820 is specifically used to: detect the first DCI and the second DCI according to the first configuration information and the second configuration information.

In another possible implementation, the apparatus 800 is used to execute each process and step corresponding to the network side device in the above method 200.

The transceiver unit 810 is used to: send first configuration information to a terminal side device, wherein the first configuration information is used to configure a search space; send first downlink control information DCI and/or second DCI to a terminal side device, wherein the first DCI includes: a first field and a truncated second field; or a truncated first field and a truncated second field; or a truncated first field and a truncated second field; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

Optionally, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

Optionally, the processing unit 820 is used to: determine that the first DCI includes the truncated first field and the second field when at least one of the following conditions is met: the number of truncated bits of the first field is less than or equal to a first threshold; the number of bits of the truncated first field is greater than a second threshold; the bandwidth of the initial uplink bandwidth part is greater than a third threshold; the network side device configures the terminal side device to perform transmission precoding through high-level signaling.

Optionally, the first DCI is generated by any one of the following operation modes: an operation mode of truncating from the highest bit of the first field; an operation mode of truncating from the highest bit of the second field; an operation mode of truncating part of the information bits of the second field and then truncating from the highest bit of the first field.

Optionally, the transceiver unit 810 is further used to: send second configuration information to the terminal side device, where the second configuration information indicates an operation mode adopted for the first DCI.

In another possible implementation, the apparatus 800 is used to execute various processes and steps corresponding to the terminal side device in the above method 700.

The processing unit 820 is used to determine the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI; the processing unit 820 is also used to: detect the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, the third DCI has the same number of bits as the second DCI generated according to the initial uplink bandwidth part and through a zero-padding operation or a truncation operation, and the fourth DCI has the same number of bits as the second DCI generated according to the initial downlink bandwidth part.

In another possible implementation, the apparatus 800 is used to execute each process and step corresponding to the network side device in the above method 700.

The processing unit 820 is used to determine the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI; the transceiver unit 810 is used to send at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, the third DCI has the same number of bits as the second DCI generated according to the initial uplink bandwidth part and through a zero-padding operation or a truncation operation, and the fourth DCI has the same number of bits as the second DCI generated according to the initial downlink bandwidth part.

Optionally, the first DCI is DCI format 0_0 in a common search space CSS; the second DCI is DCI format 1_0 in the CSS; the third DCI is DCI format 0_0 in a user specific search space USS; and the fourth DCI is DCI format 1_0 in the USS.

In another possible implementation, the apparatus 800 is used to execute various processes and steps corresponding to another terminal-side device in the above-mentioned method 700.

The processing unit 820 is used to determine the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI; the processing unit 820 is also used to: detect the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, through a zero-padding operation or a truncation operation, the first DCI has the same number of bits as the second DCI, and the third DCI is generated according to the activation of the uplink bandwidth part and through a zero-padding operation and has the same number of bits as the fourth DCI.

In another possible implementation, the apparatus 800 is used to execute each process and step corresponding to another network-side device in the above method 700.

The processing unit 820 is used to determine the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI; the transceiver unit 810 is used to send at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, through a zero-padding operation or a truncation operation, the first DCI has the same number of bits as the second DCI, and the third DCI is generated according to the activation of the uplink bandwidth part and through a zero-padding operation and has the same number of bits as the fourth DCI.

Optionally, the first DCI is DCI format 0_0 in a common search space CSS; the second DCI is DCI format 1_0 in the CSS; the third DCI is DCI format 0_0 in a user specific search space USS; and the fourth DCI is DCI format 1_0 in the USS.

It should be understood that the device 800 here is embodied in the form of a functional unit. The term "unit" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a merged logic circuit and/or other suitable components that support the described functions. In an optional example, those skilled in the art can understand that the device 800 can be specifically a terminal side device or a network side device in the above-mentioned embodiment, and the device 800 can be used to execute the various processes and/or steps corresponding to the terminal side device or the network side device in the above-mentioned method embodiment. To avoid repetition, it will not be repeated here.

The apparatus 800 of each of the above schemes has the function of implementing the corresponding steps performed by the terminal side device or the network side device in the above method; the function can be implemented by hardware, or by hardware executing the corresponding software. The hardware or software includes one or more modules corresponding to the above functions; for example, the sending unit can be replaced by a transmitter, the receiving unit can be replaced by a receiver, and other units, such as the determination unit, can be replaced by a processor, respectively performing the sending and receiving operations and related processing operations in each method embodiment.

In the embodiment of the present application, the device in FIG8 may also be a chip or a chip system, such as a system on chip (SoC). Correspondingly, the receiving unit and the sending unit may be the transceiver circuit of the chip, which is not limited here.

FIG9 shows another device 900 for transmitting downlink control information provided by an embodiment of the present application. The device 900 includes a processor 910, a transceiver 920, and a memory 930. The processor 910, the transceiver 920, and the memory 930 communicate with each other through an internal connection path, the memory 930 is used to store instructions, and the processor 910 is used to execute the instructions stored in the memory 930 to control the transceiver 920 to send and/or receive signals.

In a possible implementation, the apparatus 900 is used to execute various processes and steps corresponding to the terminal side device in the above method 200.

In which, the processor 910 is used to: receive first configuration information sent by a network side device through the transceiver 920, wherein the first configuration information is used to configure a search space; according to the first configuration information, detect first downlink control information DCI and a second DCI in the search space, wherein the first DCI includes: a first field and a truncated second field; or a truncated first field and a truncated second field; or a truncated first field and a truncated second field; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

In another possible implementation, the apparatus 900 is used to execute each process and step corresponding to the network side device in the above method 200.

In which, the processor 910 is used to: send first configuration information to the terminal side device through the transceiver 920, and the first configuration information is used to configure the search space; send first downlink control information DCI and/or second DCI to the terminal side device through the transceiver 920, and the first DCI includes: a first field and a truncated second field; or a truncated first field and a truncated second field; or a truncated first field and a truncated second field; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

In another possible implementation, the apparatus 900 is used to execute various processes and steps corresponding to the terminal side device in the above method 700.

The processor 910 is used to determine the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI; the processor 910 is also used to: detect the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, the third DCI has the same number of bits as the second DCI generated according to the initial uplink bandwidth part and through a zero-padding operation or a truncation operation, and the fourth DCI has the same number of bits as the second DCI generated according to the initial downlink bandwidth part.

In another possible implementation, the apparatus 800 is used to execute each process and step corresponding to the network side device in the above method 700.

The processor 910 is used to determine the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI; the processor 910 is used to send at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, the third DCI has the same number of bits as the second DCI generated according to the initial uplink bandwidth part and through a zero-padding operation or a truncation operation, and the fourth DCI has the same number of bits as the second DCI generated according to the initial downlink bandwidth part.

In another possible implementation, the apparatus 800 is used to execute various processes and steps corresponding to another terminal-side device in the above-mentioned method 700.

The processor 910 is used to determine the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI; the processor 910 is also used to detect the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, and the third DCI has the same number of bits as the fourth DCI generated according to the activated uplink bandwidth part and through a zero-padding operation.

In another possible implementation, the apparatus 800 is used to execute each process and step corresponding to another network-side device in the above method 700.

The processor 910 is used to determine the search space of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI; the transceiver 920 is used to send at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; wherein, the first DCI has the same number of bits as the second DCI through a zero-padding operation or a truncation operation, and the third DCI has the same number of bits as the fourth DCI generated according to the activated uplink bandwidth part and through a zero-padding operation.

It should be understood that the device 900 can be specifically a terminal side device or a network side device in the above-mentioned embodiment, and can be used to execute the various steps and/or processes corresponding to the terminal side device or the network side device in the above-mentioned method embodiment. Optionally, the memory 930 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type. The processor 910 may be used to execute instructions stored in the memory, and when the processor 910 executes instructions stored in the memory, the processor 910 is used to execute the various steps and/or processes of the above-mentioned method embodiment corresponding to the terminal side device or the network side device.

It should be understood that in the embodiments of the present application, the processor of the above-mentioned device may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software units in a processor for execution. The software unit can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor executes the instructions in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

It should be understood that the term "and/or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

Those of ordinary skill in the art will appreciate that the various method steps and units described in the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the steps and components of each embodiment have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those of ordinary skill in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present application.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims (23)

1. A method for transmitting downlink control information, comprising:

the method comprises the steps that terminal side equipment receives first configuration information sent by network side equipment, wherein the first configuration information is used for configuring a search space;

the terminal side device detects first Downlink Control Information (DCI) and second DCI in the search space according to the first configuration information, wherein the first DCI comprises:

a first field and a truncated second field; or (b)

The first field and the second field being truncated; or (b)

The first field being truncated and the second field being truncated;

wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

2. The method of claim 1, wherein the number of bits of the truncated first field is greater than 0 and the number of bits of the truncated second field is equal to or greater than 0.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

the terminal-side device determines that the first DCI includes the truncated first field and the second field when at least one of the following conditions is satisfied:

The number of bits of the first field truncated is less than or equal to a first threshold;

the number of bits of the truncated first field is greater than a second threshold;

the bandwidth of the initial upstream bandwidth portion is greater than a third threshold;

the network side equipment configures the terminal side equipment to perform transmission precoding through high-layer signaling.

4. The method of claim 1 or 2, wherein the first DCI is generated by any one of the following modes of operation:

an operation mode of truncating from the most significant bit of the first field;

an operation mode of truncating from the most significant bit of the second field;

and truncating part of information bits of the second field, and starting the truncated operation mode from the highest bit of the first field.

5. The method according to claim 4, wherein the method further comprises:

the terminal side equipment receives second configuration information sent by the network side equipment, wherein the second configuration information indicates an operation mode adopted for the first DCI;

the terminal side device detects the first DCI and the second DCI in the search space according to the first configuration information, including:

The terminal side equipment detects the first DCI and the second DCI according to the first configuration information and the second configuration information.

6. A method for transmitting downlink control information, comprising:

the network side equipment sends first configuration information to the terminal side equipment, wherein the first configuration information is used for configuring a search space;

the network side device sends first Downlink Control Information (DCI) and/or second DCI to the terminal side device, wherein the first DCI comprises:

a first field and a truncated second field; or (b)

The first field and the second field being truncated; or (b)

The first field being truncated and the second field being truncated;

wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

7. The method of claim 6, wherein the number of bits of the first field that is truncated is greater than 0 and the number of bits of the second field that is truncated is equal to or greater than 0.

8. The method according to claim 6 or 7, characterized in that the method further comprises:

the network-side device determines that the first DCI includes the truncated first and second fields when at least one of:

The number of bits of the first field truncated is less than or equal to a first threshold;

the number of bits of the truncated first field is greater than a second threshold;

the bandwidth of the initial upstream bandwidth portion is greater than a third threshold;

the network side equipment configures the terminal side equipment to perform transmission precoding through high-layer signaling.

9. The method of claim 6 or 7, wherein the first DCI is generated by any one of the following modes of operation:

an operation mode of truncating from the most significant bit of the first field;

an operation mode of truncating from the most significant bit of the second field;

and truncating part of information bits of the second field, and starting the truncated operation mode from the highest bit of the first field.

10. The method according to claim 9, wherein the method further comprises:

and the network side equipment sends second configuration information to the terminal side equipment, wherein the second configuration information indicates an operation mode adopted for the first DCI.

11. An apparatus for transmitting downlink control information, comprising:

the receiving and transmitting unit is used for receiving first configuration information sent by the network side equipment, and the first configuration information is used for configuring a search space;

A processing unit, configured to detect, in the search space, first downlink control information DCI and second DCI according to the first configuration information, where the first DCI includes:

a first field and a truncated second field; or (b)

The first field and the second field being truncated; or (b)

The first field being truncated and the second field being truncated;

wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

12. The apparatus of claim 11, wherein the number of bits of the truncated first field is greater than 0 and the number of bits of the truncated second field is equal to or greater than 0.

13. The apparatus according to claim 11 or 12, wherein the processing unit is further configured to:

determining that the first DCI includes the truncated first and second fields when at least one of the following conditions is satisfied:

the number of bits of the first field truncated is less than or equal to a first threshold;

the number of bits of the truncated first field is greater than a second threshold;

the bandwidth of the initial upstream bandwidth portion is greater than a third threshold;

The network side equipment configures the device to perform transmission precoding through high-layer signaling.

14. The apparatus of claim 11 or 12, wherein the first DCI is generated by any one of:

an operation mode of truncating from the most significant bit of the first field;

an operation mode of truncating from the most significant bit of the second field;

and truncating part of information bits of the second field, and starting the truncated operation mode from the highest bit of the first field.

15. The apparatus of claim 14, wherein the transceiver unit is further configured to:

receiving second configuration information sent by the network side equipment, wherein the second configuration information indicates an operation mode adopted for the first DCI;

the processing unit is further configured to:

and detecting the first DCI and the second DCI according to the first configuration information and the second configuration information.

16. An apparatus for transmitting downlink control information, comprising:

the receiving and transmitting unit is used for transmitting first configuration information to the terminal side equipment, wherein the first configuration information is used for configuring a search space;

the transceiver unit is further configured to: transmitting first Downlink Control Information (DCI) and/or second DCI to terminal side equipment, wherein the first DCI comprises:

A first field and a truncated second field; or (b)

The first field and the second field being truncated; or (b)

The first field being truncated and the second field being truncated;

wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

17. The apparatus of claim 16, wherein the number of bits of the first field that is truncated is greater than 0 and the number of bits of the second field that is truncated is equal to or greater than 0.

18. The apparatus according to claim 16 or 17, characterized in that the apparatus further comprises:

a processing unit configured to determine that the first DCI includes the truncated first field and the second field when at least one of the following conditions is satisfied:

the number of bits of the first field truncated is less than or equal to a first threshold;

the number of bits of the truncated first field is greater than a second threshold;

the bandwidth of the initial upstream bandwidth portion is greater than a third threshold;

the device configures the terminal side equipment to perform transmission precoding through high-layer signaling.

19. The apparatus of claim 16 or 17, wherein the first DCI is generated by any one of:

An operation mode of truncating from the most significant bit of the first field;

an operation mode of truncating from the most significant bit of the second field;

and truncating part of information bits of the second field, and starting the truncated operation mode from the highest bit of the first field.

20. The apparatus of claim 19, wherein the transceiver unit is further configured to:

and second configuration information sent to the terminal side equipment, wherein the second configuration information indicates an operation mode adopted for the first DCI.

21. An apparatus for transmitting downlink control information, comprising:

a processor for executing a program or instructions to cause the apparatus to perform the method of any one of claims 1 to 5.

22. An apparatus for transmitting downlink control information, comprising:

a processor for executing a program or instructions to cause the apparatus to perform the method of any one of claims 6 to 10.

23. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when run on a computer, causes the computer to perform the method according to any of claims 1 to 5 or the method according to any of claims 6 to 10.