WO2024016979A1 - Communication method and apparatus - Google Patents

Abstract

A communication method and apparatus, for use in flexibly indicating precoders so as to be suitable for a terminal device having more transmit antennas and uplink transmission layers, thereby improving the uplink transmission performance. A network device determines first information and sends the first information to a terminal device, so that the terminal device determines N precoders according to W precoders indicated by the first information and whether the number of indicated uplink transmission layers is greater than M, and sends uplink data on the basis of the N precoders. M is a preset threshold of the number of uplink transmission layers. In this way, precoder indication of the actual number of transmission layers can be flexible adapted, so that the number of transmit antennas supported by the terminal device can be flexibly adapted, thereby improving the uplink transmission performance. Moreover, the indication overhead is relatively small.

Description

A communication method and device

Cross-references to related applications

This application claims priority to the Chinese patent application submitted to the China Patent Office on July 22, 2022, with application number 202210867372.9 and the application title "A communication method and device", the entire content of which is incorporated into this application by reference.

Technical field

The present application relates to the field of communication technology, and in particular, to a communication method and device.

Background technique

The fifth generation (5G) mobile communication system has higher requirements on system capacity, spectrum efficiency and other aspects. In 5G communication systems, the application of massive multiple-input multiple-output (massive-MIMO) technology plays a crucial role in improving the spectrum efficiency of the system. Using massive-MIMO technology, terminal equipment needs to precode the data when sending uplink data. Multi-antenna precoding for uplink transmission can support multiple types of transmission modes. For example, a common transmission mode is the non-codebook based UL transmission scheme (NCB).

For the NCB uplink transmission mode, the terminal device obtains the uplink channel information based on the channel state information reference signal (CSI-RS) sent by the network device and the channel reciprocity, and then calculates multiple candidate precoders (precoder ), and loads multiple candidate precodes onto the sounding reference signal (SRS) resource and sends it to the network device. Finally, the network device indicates the selected precode to the network device through the SRS resource indicator (SRS resource indicator, SRI). Terminal Equipment.

However, the current indication method of network equipment can only be applied to terminal equipment with a limited number of transmitting antennas and uplink transmission layers, that is, the number of supported transmitting antennas and uplink transmission layers is limited. As communication systems have higher and higher demand for uplink system capacity, the number of transmit antennas and uplink transmission layers supported by terminal equipment is also increasing. The existing indication method is obviously unable to support it and may cause uplink transmission failure.

Contents of the invention

The present application provides a communication method and device for flexibly performing precoding instructions, so as to be applicable to more transmitting antennas and uplink transmission layer terminal equipment, and to improve uplink transmission performance.

In the first aspect, this application provides a communication method, which can be applied to a terminal device, a functional module in the terminal device, a processor or chip in the terminal device, etc. Taking application to a terminal device as an example, the method may include: the terminal device receives first information from the network device, the first information is used to indicate W precoding, and is used to indicate whether the number of uplink transmission layers is greater than M; further, The terminal device may determine N precodes based on the W precodes and whether the number of uplink transmission layers is greater than M, and send uplink data based on the N precodes. Wherein, the W is a positive integer, M is a preset uplink transmission layer number threshold, and the N is an integer greater than or equal to the W.

Through the above method, the precoding indication of the actual number of uplink transmission layers can be flexibly adapted, so that the number of transmit antennas supported by the terminal device can be flexibly adapted to improve uplink transmission performance. At the same time, the instruction overhead is relatively small.

In a possible design, before the terminal device receives the first information from the network device, the terminal device may determine the candidate precoding and send the candidate precoding to the network device through resources used for uplink transmission. The candidate precoding, wherein the number of the candidate precoding is related to the number of resources used for uplink transmission and the number of ports corresponding to the resources used for uplink transmission; the W precoding and the N precodes are all included in the candidate precodes. In this way, the network device can subsequently accurately select W precodes among the candidate precodes to indicate to the terminal device.

In a possible design, when the number of resources used for uplink transmission is A and the number of ports is B, the number of candidate precoders is A*B; furthermore, the terminal device passes all The resource used for uplink transmission sends the candidate precode to the network device. The method may be: the terminal device sorts A*B candidate precodes according to the first performance from high to low; then, the terminal The device divides the sorted A*B candidate precodes into a group of candidate precodes according to the sorting order, and each group of candidate precodes contains B candidate precodes; finally, the terminal device divides the A group of candidate precodes into The precodes are respectively sent to the network device through A resources for uplink transmission, and the A group of candidate precodes correspond to the A resources for uplink transmission one-to-one. Among them, the A is a positive integer, and the B is a positive integer. In this way, the terminal device can flexibly and accurately send the determined candidate precoding to the network device.

In a possible design, two sequentially adjacent candidate precoders are not located in the same group, but are located in adjacent groups.

In a possible design, the first information is used to indicate whether the number of uplink transmission layers is greater than M, which can be implemented by the following method: the first information can include a first bit, and the first bit indicates that the Whether the number of uplink transmission layers is greater than M; or, the first information may include a first field, the first field is used to indicate the number of activated codewords; wherein, when the first field indicates the number of activated codewords, When the number is 1, the first information may indicate that the number of uplink transmission layers is less than or equal to M; when the first field indicates that the number of activated codewords is 2, the first information may indicate that the uplink The number of transmission layers is greater than M. In this way, whether the number of uplink transmission layers is greater than M can be directly or indirectly indicated through the first information, and the indication method is relatively flexible.

In a possible design, when the first information indicates that the number of uplink transmission layers is less than or equal to M, the W precodes indicated by the first information may be M of the candidate precodes. W candidate precodes among the candidate precodes, the M candidate precodes may be the top M candidate precodes with first performance from high to low among the candidate precodes, and the W is less than or equal to M, so The W is equal to the N, that is, the W precoders are the N precoders. This can indicate precoding with better performance to the terminal device.

For example, the first performance may be, but is not limited to, signal to noise ratio (SNR), etc.

In a possible design, the first information may include first indication information, and the first indication information is used to indicate indices of the W candidate precodings. This saves instruction overhead.

In another possible design, when the first information indicates that the number of uplink transmission layers is greater than M, the W precodes indicated by the first information may be the candidate precodes except M candidates. N-M candidate precodes among candidate precodes other than precoders. The N precodes may be the M candidate precodes and the N-M candidate precodes. Wherein, the M candidate precodes may be the top M candidate precodes with first performance from high to low among the candidate precodes, the N is greater than the M, and the W is equal to N-M. This ensures that precoding with better performance is indicated to the terminal device.

In a possible design, the first information includes second indication information, and the second indication information is used to indicate indexes of the N-M candidate precodings. In this way, the indication information indicates the index of part of the candidate precoding, which can save indication overhead.

In the second aspect, this application provides a communication method, which can be applied to network equipment, a functional module in the network equipment, a processor or chip in the network equipment, etc. Taking application to a network device as an example, the method may include: the network device determines the first information and sends the first information to the terminal device. The first information is used to indicate W precodings and to indicate whether the number of uplink transmission layers is greater than M. Whether the W precodes and the number of uplink transmission layers are greater than M is used by the terminal device to determine N precodes, so that the terminal device can determine whether the W precodes and the number of uplink transmission layers are greater than M. Determine the N precodes; the W is a positive integer, the M is a preset uplink transmission layer number threshold, and the N is an integer greater than or equal to the W; the N precoders are used for terminals The device sends uplink data.

Through the above method, the precoding indication of the actual number of uplink transmission layers can be flexibly adapted, so that the number of transmit antennas supported by the terminal device can be flexibly adapted to improve uplink transmission performance. At the same time, the instruction overhead is relatively small.

In a possible design, before the network device determines the first information, the network device may receive candidate precoding from the terminal device through resources used for uplink transmission, and in the candidate precoding Determine the W precoders. The number of candidate precoders is related to the number of resources used for uplink transmission and the number of ports corresponding to the resources used for uplink transmission. In this way, the network device can accurately select W precoding instructions among the candidate precodes sent by the terminal device and provide them to the terminal device.

In a possible design, when the number of resources used for uplink transmission is A and the number of ports is B, the number of candidate precoders is A*B; furthermore, the network device passes all The resource used for uplink transmission receives the candidate precoding from the terminal device. The method may be: the network device receives a group of candidate precodes from the terminal device through A resources used for uplink transmission. The A group of candidate precodings correspond to the A resources used for uplink transmission one-to-one; wherein the A group of candidate precodings are A*B candidate precodings sorted from high to low according to the first performance. Divided in sorting order, each group of candidate precoders contains B candidate precoders. The A is a positive integer, and the B is a positive integer. In this way, the network device can receive candidate precodes from the terminal device flexibly and accurately.

In a possible design, two sequentially adjacent candidate precoders may not be located in the same group, but may be located in adjacent groups.

For example, the first performance may be, but is not limited to, SNR, etc.

In a possible design, the first information is used to indicate whether the number of uplink transmission layers is greater than M, which can be implemented by the following method: the first information can include a first bit, and the first bit indicates that the Whether the number of uplink transmission layers is greater than M; or, the first information may include a first field, the first field is used to indicate the number of activated codewords; wherein, when the first field indicates the number of activated codewords, When the number is 1, the first information indicates that the number of uplink transmission layers is less than or equal to M; when the first field indicates that the number of activated codewords is 2, the first information indicates that the uplink transmission layer The number is greater than M. In this way, it can be directly indicated through the first information or It indirectly indicates whether the number of uplink transmission layers is greater than M, and the indication method is relatively flexible.

In a possible design, when the first information indicates that the number of uplink transmission layers is less than or equal to M, the W precodes indicated by the first information may be M of the candidate precodes. W candidate precodes among the candidate precodes, the M candidate precodes may be the top M candidate precodes with first performance from high to low among the candidate precodes, and the W is less than or equal to M, so Said W is equal to said N. This can indicate precoding with better performance to the terminal device.

In a possible design, the first information may include first indication information, and the first indication information is used to indicate indices of the W candidate precodings. This saves instruction overhead.

In a possible design, when the first information indicates that the number of uplink transmission layers is greater than M, the W precodes indicated by the first information may be the candidate precodes except M candidate precodes. N-M candidate precodes among candidate precodes other than coding; the N precodes may be the M candidate precodes and the N-M candidate precodes; the M candidate precodes may be the candidates The first M candidate precodes with first performance in precoding from high to low, the N is greater than the M, and the W is equal to N-M. This ensures that precoding with better performance is indicated to the terminal device.

In a possible design, the first information may include second indication information, and the second indication information is used to indicate the indexes of the N-M candidate precodings. In this way, indication overhead can be saved by indicating the index of part of the candidate precoding.

In a third aspect, this application also provides a communication device. The communication device may be a terminal device, a processor, a chip or a functional module in the terminal device, etc. The communication device has the ability to implement the above first aspect or the first aspect. functions of the terminal device in each possible design example. The functions described can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the structure of the communication device includes a transceiver unit and a processing unit. These units can perform the corresponding functions of the terminal equipment in the above first aspect or each possible design example of the first aspect. For details, see the method examples. The detailed description in , will not be repeated here.

In a possible design, the structure of the communication device includes a transceiver and a processor, and optionally a memory. The transceiver is used to send and receive information or data, and to communicate with other devices in the communication system. Interactively, the processor is configured to support the communication device to perform corresponding functions of the terminal device in the above-mentioned first aspect or each possible design example of the first aspect. The memory is coupled to the processor and holds program instructions and data necessary for the communications device.

In a fourth aspect, this application also provides a communication device. The communication device may be a network device, a processor, a chip or a functional module in the network device, etc. The communication device has the ability to implement the above second aspect or the second aspect. functions of the terminal device in each possible design example. The functions described can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the structure of the communication device includes a transceiver unit and a processing unit. These units can perform the corresponding functions of the network equipment in the above second aspect or each possible design example of the second aspect. For details, see the method examples. The detailed description in , will not be repeated here.

In a possible design, the structure of the communication device includes a transceiver and a processor, and optionally a memory. The transceiver is used to send and receive information or data, and to communicate with other devices in the communication system. Interactively, the processor is configured to support the communication device to perform corresponding functions of the network device in the above second aspect or each possible design example of the second aspect. The memory is coupled to the processor and holds program instructions and data necessary for the communications device.

In a fifth aspect, embodiments of the present application provide a communication system, which may include a terminal device for performing the above first aspect or various possible design examples of the first aspect and a terminal device for performing the above second aspect or the second aspect. network devices, etc. in each possible design example.

In a sixth aspect, embodiments of the present application provide a computer-readable storage medium. The computer-readable storage medium stores program instructions. When the program instructions are run on a computer, they cause the computer to execute the first aspect of the embodiments of the application and its contents. any possible design, or the method described in the second aspect and any possible design thereof. By way of example, computer-readable storage media can be any available media that can be accessed by a computer. Taking this as an example but not limited to: computer-readable media may include non-transitory computer-readable media, random-access memory (random-access memory, RAM), read-only memory (read-only memory, ROM), electrically erasable memory In addition to programmable read-only memory (electrically EPROM, EEPROM), CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or can be used to carry or store the desired program code in the form of instructions or data structures and can Any other media accessed by a computer.

In a seventh aspect, embodiments of the present application provide a computer program product, including computer program code or instructions. When the computer program When the code or instruction is run on the computer, the method described in the above-mentioned first aspect or any possible design of the first aspect, or the above-mentioned second aspect or any possible design of the second aspect is executed.

In an eighth aspect, the present application also provides a chip, including a processor, the processor being coupled to a memory and configured to read and execute program instructions stored in the memory, so that the chip implements the first step described above. aspect or any possible design of the first aspect, or the method described in the above-mentioned second aspect or any possible design of the second aspect.

For each aspect in the above-mentioned third to eighth aspects and the technical effects that may be achieved by each aspect, please refer to the above-mentioned first aspect or various possible solutions in the first aspect, or the above-mentioned second aspect or each possible solution in the second aspect. The description of the technical effects that can be achieved by this possible solution will not be repeated here.

Description of drawings

Figure 1 is a schematic diagram of the architecture of a communication system provided by this application;

Figure 2 is a schematic diagram of the structure of a network device or terminal device provided by this application;

Figure 3 is a flow chart of a communication method provided by this application;

Figure 4 is a schematic structural diagram of a communication device provided by this application;

Figure 5 is a structural diagram of a communication device provided by this application.

Detailed ways

The present application will be described in further detail below with reference to the accompanying drawings.

Embodiments of the present application provide a communication method and device for flexibly performing precoding instructions, so as to be applicable to more transmitting antennas and uplink transmission layer terminal equipment, and to improve uplink transmission performance. Among them, the method and the device described in this application are based on the same technical concept. Since the principles of solving problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repeated parts will not be repeated.

To facilitate understanding, some terms involved in the embodiments of this application are introduced below.

1) The network device is a device with wireless transceiver function or a chip that can be installed on the network device. Network equipment can also be called access network equipment, access node (AN), and wireless access node (radio access node, RAN). The network equipment includes but is not limited to: base station (generation node B, gNB), wireless network controller (radio network controller, RNC), node B (Node B, NB), base station controller (base station controller, BSC), base station Transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), wireless fidelity (wireless fidelity, Wi-Fi) system Access point (AP), wireless relay node, wireless backhaul node, transmission point (transmission and reception point, TRP or transmission point, TP), etc., can also be network nodes that constitute a gNB or transmission point, such as Baseband unit (BBU), or distributed unit (DU), etc.

2) Terminal equipment can also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment , user agent or user device. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiver functions, a virtual reality (VR) terminal device, or an augmented reality (AR) terminal. Equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation security ( Wireless terminals in transportation safety, wireless terminals in smart cities, smart wearable devices (smart glasses, smart watches, smart headphones, etc.), wireless terminals in smart homes, etc., can also be Chips or chip modules (or chip systems) that can be installed on the above devices. The embodiments of this application do not limit application scenarios. In this application, terminal equipment with wireless transceiver functions and chips or modules that can be installed in the aforementioned terminal equipment are collectively referred to as terminal equipment.

3) The number of uplink transmission layers refers to the number of uplink data streams, or the number of spatial streams. For spatial multiplexing, the maximum number of uplink transmission layers is the rank of the MIMO channel matrix. The rank of the MIMO channel matrix is the intermediate value obtained by performing transfer matrix singular value decomposition (SVD) on the MIMO channel matrix. The number of diagonal elements (singular values) of a diagonal matrix. Generally, the maximum number of uplink transmission layers of the terminal device is less than or equal to the number of transmit antennas of the terminal device, and the actual number of uplink transmission layers of the terminal device is less than or equal to the maximum number of uplink transmission layers of the terminal device. For example, the maximum number of uplink transmission layers of the terminal device is equal to the number of transmit antennas of the terminal device, and the number of transmit antennas of the terminal device is 8, then the maximum number of transmission layers corresponding to the number of transmit antennas of the terminal device is 8, and the number of uplink transmission layers of the terminal device is 8. The number of transport layers can be any integer from 1 to 8.

4) In the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor as indicating or implying order.

5) In the description in this application, "at least one (species)" refers to one (species) or multiple (species), and multiple (species) refers to two (species) or more than two (species). "At least one of the following" or similar expressions thereof refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c Can be single or multiple.

6) "And/or" in the description of this application describes the relationship between associated objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and they exist alone. In the case of B, A and B can be singular or plural. "/" means "or", for example, a/b means a or b.

In order to describe the technical solutions of the embodiments of the present application more clearly, the communication method and device provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The communication method provided by the embodiment of the present application can be applied to various communication systems, such as the fourth generation (4th generation, 4G) communication system (such as the Long Term Evolution (LTE) system), the fifth generation (5th generation, 5G) communication system, global interoperability for microwave access (WiMAX) or wireless local area network (WLAN) system, or a convergence system of multiple systems, or a future communication system, such as the sixth Generation (6th generation, 6G) communication system, etc. Among them, the 5G communication system can also be called a new radio (NR) system. The communication method provided by the embodiments of the present application can also be applied in scenarios such as wireless communication networks where uplink precoding indication can be used. The communication process can occur between network devices and end devices.

By way of example, FIG. 1 shows the architecture of a possible communication system to which the communication method provided by this application is applicable. The communication system may include TRP1 and TRP2, and UE1 to UE5. Among them, UE1 to UE5 can send uplink data, and the uplink data sent by UE1 to UE5 can be received by one of the TRPs. For example, as shown in Figure 1, UE1 and UE2 communicate with TRP1, and the uplink data sent by UE1 and UE2 are received by TRP1. TRP1 may also send downlink data and/or information to UE1 and UE2. UE5 communicates with TRP2. The uplink data sent by UE5 is received by TRP2. TRP2 can send downlink data and/or information to UE5. The uplink data sent by UE1 to UE5 can also be jointly received by two TRPs at the same time. For example, UE3 and UE4 can communicate with TRP1 and TRP2 at the same time. The uplink data sent by UE3 and UE4 can be jointly received by TRP1 and TRP2 at the same time. TRP1 and TRP2 can also Downlink data and/or information may be sent to UE3 and UE4. In the embodiment of this application, the number of uplink transmission streams and uplink precoding of each UE are calculated by the TRP (i.e., network equipment) side, and are indicated to each UE through downlink information.

It should be noted that the number and type of each device in the communication system shown in Figure 1 are only for illustration. The embodiments of the present application are not limited thereto. In actual applications, the communication system may also include more or fewer terminals. equipment, more or less network equipment, and may also include other network elements, such as core network elements, etc.

It should be noted that the network device in Figure 1 is only TRP as an example. It should be understood that it can also be other types of network devices, which is not limited in this application.

Referring to Figure 2, the network equipment and terminal equipment involved in the embodiment of the present application may include the following modules:

Radio resource control (RRC) signaling interaction module: a module used by network equipment and terminal equipment to send and receive RRC signaling. For example, the network equipment sends RRC signaling to the terminal equipment, and the terminal equipment receives RRC from the network equipment. signaling.

Media access control (media access control, MAC) signaling interaction module: a module used by network equipment and terminal equipment to send and receive media access control (medium access control, MAC)-control element (CE) signaling , such as the network device sends MAC-CE signaling to the terminal device, and the terminal device receives the MAC-CE signaling from the network device.

Physical layer (PHY) signaling and data interaction module: a module used by network equipment and terminal equipment to send and receive uplink/downlink control signaling and uplink/downlink data. For example, the network device sends a physical downlink control channel (PDCCH), such as downlink control information (DCI) in the PDCCH, to the terminal device, and the network device sends a physical downlink shared channel (physical downlink shared) to the terminal device. channel, PDSCH), such as downlink data in PDSCH. The terminal device sends a physical uplink control channel (PUCCH) to the network device, such as the uplink control information (UCI) in the PUCCH, and the terminal device sends a physical uplink shared channel (physical uplink shared channel) to the network device. PUSCH), such as the uplink data in PUSCH.

It should be understood that the modules shown in Figure 2 are only exemplary, and network equipment and terminal equipment may also include other communication modules, such as radio link control (RLC) modules, packet data convergence protocol (packet data convergence protocol). , PDCP) module, or service data adaptation protocol (service data adaptation protocol, SDAP) module, etc., the embodiments of this application do not specifically limit this.

In 5G communication systems, the application of massive-MIMO technology plays a crucial role in improving the spectrum efficiency of the system. Using massive-MIMO technology, terminal equipment needs to precode the data when sending uplink data. The 3GPP NR protocol supports two types of transmission modes for multi-antenna precoding for uplink transmission: codebook based UL transmission scheme (CB) and non-codebook based UL transmission mode (CB). transmission scheme, NCB).

For the NCB uplink transmission mode, the terminal device obtains the uplink channel information based on the CSI-RS sent by the network device and the channel reciprocity, then calculates multiple candidate precoders (precoder), and loads the multiple candidate precoders into the SRS resources are sent to the network device, and finally the network device indicates the selected precoding to the terminal device through SRI.

For the NCB-based uplink transmission mode, the 3GPP NR R16 protocol supports SRI indication when the number of transmitting antennas of the terminal equipment is 2 transmitters (TX) and 4TX and when the maximum number of uplink transmission layers of the terminal equipment is 4. The network device sends CSI-RS to the terminal device, and the terminal device estimates the downlink channel information and obtains the uplink channel information based on the reciprocity of the uplink and downlink channels. The terminal device calculates four 4*1 candidate precoders based on the estimated uplink channel information, and loads the first N _SRS precoder on the N _SRS SRS resources and sends them to the network device. The existing protocol stipulates that the maximum number of SRS resources configured for the NCB-based uplink transmission mode is 4, the N _SRS value can be 2, 3, or 4, and each SRS resource has 1 port. The network device receives the SRS sent by the terminal device and estimates the candidate precoder, then determines which precoder to use, and uses the SRI field in the downlink control information (DCI) to index the SRS resource corresponding to the selected precoder. Instructions to terminal equipment. After receiving the DCI, the terminal device locates the SRI indication table (table) and the corresponding columns according to the high-layer parameters N _SRS and L _max indicated by the RRC, such as Table 1 below. Among them, N _SRS is the number of SRS resources used to upload candidate precoder in the NCB transmission specified by the network device, and L _max is the maximum number of uplink transmission layers in the NCB transmission specified by the network device. For example, when L _max =4 and N _SRS =4, column 6 in Table 1 below can be located. Finally, the terminal device determines the corresponding row according to the bit value of the SRI field, and uses the precoder corresponding to the row to perform PUSCH transmission.

Table 1

As mentioned above, the current 3GPP NR R16 protocol defines the SRI indication rules when the number of transmitting antennas of the terminal equipment is 2TX and 4TX, and the maximum number of uplink transmission layers of the terminal equipment is 4. In order to further improve the uplink system capacity, the number of transmitting antennas of terminal equipment is expected to increase to 8TX and above, and the maximum number of uplink transmission layers supported by each terminal equipment may exceed 4 layers. Therefore, the number of transmitting antennas of the terminal device may exceed the number of transmitting antennas of the terminal device supported by the indication method in the current protocol, and the number of uplink transmission layers may also exceed the number of uplink transmission layers of the terminal device supported by the indication method in the current protocol. However, the above The indicated method cannot be supported and may cause uplink transmission to fail.

Based on this, embodiments of this application propose a communication method that can be applied to more transmitting antennas and uplink transmission layer terminal equipment to improve uplink transmission performance.

It should be noted that in the following embodiments, the communication method provided by this application is described in detail by taking terminal equipment and network equipment as examples. It should be understood that the operations performed by the terminal equipment can also be performed by the processor in the terminal equipment, or by the chip. Or a chip system, or a functional module, etc. The operations performed by the network device can also be implemented by a processor in the network device, or a chip or chip system, or a functional module, etc. This application is not limited to this.

Based on the above description, a communication method provided by the embodiment of the present application can be seen as shown in Figure 3 . The process of this method can include:

Step 301: The network device determines the first information. The first information is used to indicate W precoding and whether the number of uplink transmission layers is greater than M. The W is a positive integer, and the M is a preset uplink transmission layer. Transport layer threshold.

Step 302: The network device sends the first information to the terminal device. Correspondingly, the terminal device receives the first information from the network device.

Step 303: The terminal device determines N precodes based on the W precodes and whether the number of uplink transmission layers is greater than M, and sends uplink data based on the N precodes. Wherein, the N may be an integer greater than or equal to the W.

Optionally, M can be 4, etc. It can also be understood that M is the maximum number of uplink transmission layers supported by the terminal device described above, 4. Of course, it should be understood that M can also take other values, which is not limited in this application.

In an optional implementation, before the network device determines the first information, the terminal device may determine candidate precodes, and the number of candidate precodes may be the same as the number of resources used for uplink transmission. The number is related to the number of ports corresponding to the resources used for uplink transmission. Afterwards, the terminal device may send the candidate precoding to the network device through the resource for uplink transmission, and accordingly, the network device may obtain the candidate precode from the terminal device through the resource for uplink transmission. The candidate precode is received. Furthermore, the network device may determine the W precodes among the candidate precodes.

Exemplarily, the network device sends a downlink reference signal for channel measurement to the terminal device, and the terminal device can determine the candidate precoding according to the downlink reference signal and channel reciprocity. The downlink reference signal may be, but is not limited to, a channel state information reference signal (channel state information reference signal, CSI-RS), etc.

Wherein, when the number of resources used for uplink transmission is A and the number of ports corresponding to the resources used for uplink transmission is B, then the number of candidate precoders may be A*B, and the A is a positive integer, and B is a positive integer.

The resources used for uplink transmission may be, but are not limited to, uplink reference signal resources, such as, but are not limited to, SRS resources.

In an example a1, when the number of SRS resources is 4 and the number of ports corresponding to the SRS resources is 2, the number of candidate precoders may be 8.

In another example a2, when the number of SRS resources is 8 and the number of ports corresponding to the SRS resources is 1, the number of candidate precoders may be 8.

In an optional implementation, the terminal device sends the candidate precoding to the network device through the resource used for uplink transmission. The method may be as follows: the terminal device may send A*B candidates The precodes are sorted from high to low according to the first performance. Then, the terminal device can divide the sorted A*B candidate precodes into a group of candidate precodes in the sort order, and each group of candidate precodes contains B candidate precodes; finally, the terminal device may send the A group of candidate precodes to the network device through A resources for uplink transmission, and the A group of candidate precodes are consistent with the A group of candidate precodes. Resources used for uplink transmission correspond one to one.

Optionally, two sequentially adjacent candidate precoders may not be located in the same group, but may be located in adjacent groups.

For example, the first performance may be, but is not limited to, signal to noise ratio (SNR), etc.

For example, in the above example a1, after the eight candidate precoders are sorted in descending order of SNR, the indexes of the candidate precoders may be 0, 1, 2, 3, 4, 5, 6, and 7. Further, the above eight candidate precoders can be divided into four groups, namely {0, 4}, {1, 5}, {2, 6} and {3, 7}, and then the terminal device can divide the above four groups of candidates into The precoding is loaded onto SRS resource 0, SRS resource 1, SRS resource 2 and SRS resource 3 respectively and sent to the network device. For example, the terminal device may send the above candidate precoding {0, 4} to the network device through SRS resource 0.

For another example, in the above example a2, after the eight candidate precoders are sorted in descending order of SNR, the indexes of the candidate precoders may be 0, 1, 2, 3, 4, 5, 6, and 7. Further, the above eight candidate precoders can be divided into eight groups, namely {0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}, and then The terminal device can load the above eight sets of candidate precodes onto SRS resources 0 to 7 respectively and send them to the network device. For example, the terminal device may send the above candidate precoding {0} to the network device through SRS resource 0.

Optionally, in the above example a2, since the number of ports corresponding to the SRS resource is 1, each group of candidate precodings contains 1 candidate precoding. In this case, the terminal device may not perform candidate precoding. For the grouping operation, after sorting the 8 candidate precodes, the sorted 8 candidate precodes can be directly loaded into SRS resources 0 to 7 respectively and sent to the network device.

It should be noted that in the above example, the index of the candidate precoding or the index number of the SRS resource all starts with 0. Alternatively, it can also start with 1. Initially, this application does not limit this.

In an optional implementation, the first information may indicate whether the number of uplink transmission layers is greater than M in the following manner:

Method b1: The first information may include a first bit, and the first bit indicates whether the number of uplink transmission layers is greater than M.

For example, the first bit may include 1 bit, which directly indicates whether the number of uplink transmission layers is greater than M. For example, if the value of this 1 bit is a first value, the first information may indicate that the number of uplink transmission layers is less than or equal to M, and if the value of this 1 bit is a second value, the first information may indicate that the number of uplink transmission layers may be The number of transmission layers is greater than M. Wherein, the first value may be 0 and the second value may be 1; or the first value may be 1 and the second value may be 0; or the first value and the second value may have other values. This application is concerned with the third value. The first value and the second value are not limited.

Method b2: The first information may include a first field, and the first field may be used to indicate the number of activated codewords; when the first field indicates that the number of activated codewords is 1, The first information may indicate that the number of uplink transmission layers is less than or equal to M; when the first field indicates that the number of activated codewords is 2, the first information may indicate that the number of uplink transmission layers is greater than M .

For example, the first field may be, but is not limited to, a field such as modulation and coding scheme (modulation and coding scheme, MCS), redundancy version (redundancy version, RV) or NDI.

Optionally, in this application, the first information may be downlink control information (DCI), or the first information may also be carried in the DCI, which is not limited in this application.

Further, in a possible implementation c1, when the first information indicates that the number of uplink transmission layers is less than or equal to M, the W precoders indicated by the first information may be the candidates. W candidate precodes among the M candidate precodes in the precoding, the M candidate precodes may be the top M candidate precodes with the first performance from high to low among the candidate precodes, the W Less than or equal to the M, the W is equal to the N. That is to say, when the number of uplink transmission layers is less than or equal to M, the N precodes determined by the terminal device are the W precodes indicated by the first information.

For example, as in the aforementioned example a1 or a2, assuming M is 4, when the number of uplink transmission layers is less than or equal to 4, N precodes (that is, the W precodes) can be sorted in descending order by SNR. N of the first four candidate precodes, that is, the N precodes can be N of the candidate precodes with indexes 0, 1, 2, and 3. In this case, N is less than or equal to 4.

Exemplarily, the first information may include first indication information, and the first indication information may be used to indicate indices of the W candidate precodings.

Optionally, the method for indicating the indexes of the W candidate precodings by the first indication information may reuse the aforementioned indication method combined with Table 1.

In a possible implementation manner c2, when the first information indicates that the number of uplink transmission layers is greater than M, the W precodes indicated by the first information may be the candidate precodes except N-M candidate precodes among candidate precodes other than M candidate precodes, the N precodes may be the M candidate precodes and the N-M candidate precodes; the M candidate precodes are still It may be the top M candidate precodes with first performance from high to low among the candidate precodes, the N is greater than the M, and the W is equal to N-M.

For example, as in the aforementioned example a1 or a2, assuming M is 4, when the number of uplink transmission layers is greater than 4, the N precodes may include the first 4 candidate precodes sorted by SNR in descending order, For example, N precodes may include candidate precodes with indexes 0, 1, 2, and 3. And, the remaining N-4 candidate precodes are N-4 of the candidate precodes other than the above-mentioned 4 candidate precodes, for example, N-4 of the candidate precodes with indexes 4, 5, 6, and 7. 4, N is greater than 4 at this time.

Exemplarily, the first information may include second indication information, and the second indication information is used to indicate the indexes of the N-M candidate precodings.

For example, when the second indication information indicates the N-M candidate precodes, the candidate precode corresponding to the index obtained by the first index + M may be used as the N-M candidate precodes. The first index may be indicated by the second indication information, and the first index may be the index of the candidate precoding indicated by the indication method in combination with Table 1. For example, when positioning is the sixth column in Table 1, assuming that the value of the second indication information is 0111, then the second indication information indicates the row with index (index) 7 in Table 1, That is to say, the second indication information indicates the candidate precodings with indexes 1 and 2. Based on the above rules, the candidate precodings with indexes 1+M and 2+M are the N-M ones implicitly indicated by the second indication information. Candidate precoders. Assuming that M is 4, the N precoders are candidate precoders with indexes 0, 1, 2, 3, 5, and 6.

In an optional implementation, when the number of resources used for uplink transmission is less than or equal to 4, and the number of uplink transmission layers is less than or equal to 4, the network device can directly indicate N predetermined times according to the existing method. Coding, that is, directly combined with Table 1 to indicate the selected precoding.

The above method can be flexibly adapted to the precoding indication of the actual number of uplink transmission layers, thereby flexibly adapting to the number of transmit antennas supported by the terminal device and improving uplink transmission performance. At the same time, the instruction overhead is relatively small.

Based on the above embodiments, embodiments of the present application also provide a communication device. Referring to FIG. 4 , the communication device 400 may include a transceiver unit 401 and a processing unit 402 . The transceiver unit 401 is used for communicating with the communication device 400 , such as receiving information, messages or data, etc., or sending information, messages or data, etc., and the processing unit 402 is used for processing the communication device 400 . Actions are controlled and managed. The processing unit 402 can also control the steps performed by the transceiver unit 401.

For example, the communication device 400 may be the terminal device in the above embodiment, a processor of the terminal device, a chip, a chip system, a functional module, etc. Alternatively, the communication device 400 may specifically be the network device in the above embodiment, the processor of the network device, or a chip, or a chip system, or a functional module, etc.

In one embodiment, when the communication device 400 is used to implement the functions of the terminal device in the above embodiment, the transceiver unit 401 can be used to receive first information from a network device, where the first information is used to indicate W precoding, and used to indicate whether the number of uplink transmission layers is greater than M, where W is a positive integer, and M is a preset threshold for the number of uplink transmission layers; the processing unit 402 may be used to perform precoding according to the W precoding and whether the number of uplink transmission layers is greater than M, determine N precodes; the transceiver unit 401 may also be used to send uplink data based on the N precodes. The N may be an integer greater than or equal to the W.

In an optional implementation, the processing unit 402 may also be configured to: before the transceiver unit 401 receives the first information from the network device, determine a candidate precoding. The number is related to the number of resources used for uplink transmission and the number of ports corresponding to the resources used for uplink transmission;

The transceiver unit 401 may also be configured to send the candidate precoding to the network device through the resource used for uplink transmission. Wherein, the W candidate precodes and the N precodes are both included in the candidate precodes.

For example, when the number of resources used for uplink transmission is A and the number of ports is B, the number of candidate precoders is A*B, where A is a positive integer, and B is positive integer;

Furthermore, the processing unit 402 may also be used to sort the A*B candidate precodes from high to low according to the first performance; and divide the sorted A*B candidate precodes into group A according to the sorting order. Candidate precoders, each group of candidate precoders contains B candidate precoders;

When the transceiver unit 401 sends the candidate precodes to the network device through the resources for uplink transmission, it may be specifically configured to: pass the A group of candidate precodes through A resources for uplink transmission respectively. Sent to the network device, the A group of candidate precodes corresponds one-to-one to the A resources used for uplink transmission.

Optionally, the first information is used to indicate whether the number of uplink transmission layers is greater than M, which may include: the first information includes a first bit, the first bit indicates whether the number of uplink transmission layers is greater than M. ; Or, the first information includes a first field, and the first field is used to indicate the number of activated codewords; when the first field indicates that the number of activated codewords is 1, the first information Indicates that the number of uplink transmission layers is less than or equal to M; when the first field indicates that the number of activated codewords is 2, the first information indicates that the number of uplink transmission layers is greater than M.

In an example, when the first information indicates that the number of uplink transmission layers is less than or equal to M, the W precodes indicated by the first information may be the M candidate precodes among the candidate precodes. W candidate precodes in encoding, the M candidate precodes may be the top M candidate precodes with first performance from high to low among the candidate precodes, and the W is less than or equal to the M, so Said N is equal to said W.

Optionally, the first information may include first indication information, and the first indication information is used to indicate indices of the W candidate precodings.

In another example, when the first information indicates that the number of uplink transmission layers is greater than M, the W precodes indicated by the first information may be the candidate precodes except M candidate precodes. N-M candidate precodes among candidate precodes other than coding, the N precodes may be the M candidate precodes and the N-M candidate precodes; the M candidate precodes may be the candidate The first M candidate precodes with first performance in precoding from high to low, and the N is greater than the M.

Optionally, the first information may include second indication information, and the second indication information is used to indicate the indexes of the N-M candidate precodings.

In another embodiment, when the communication device 400 is used to implement the functions of the network device in the above embodiment, the processing unit 402 can be used to determine the first information, the first information is used to indicate W precoding , and used to indicate whether the number of uplink transmission layers is greater than M, the W is a positive integer, and the M is the preset threshold of the number of uplink transmission layers; whether the W precoding and the number of uplink transmission layers are greater than M are used To determine N precodes, the N precodes are used by the terminal device to send uplink data; the N is an integer greater than or equal to the W; the transceiver unit 401 may be used to send the terminal device the The first information enables the terminal device to determine N precodes based on the W precodes and whether the number of uplink transmission layers is greater than M.

Optionally, the transceiver unit 401 may also be configured to: before the processing unit 402 determines the first information, receive candidate precoding from the terminal device through resources used for uplink transmission; the candidate precoding The number of is related to the number of resources used for uplink transmission and the number of ports corresponding to the resources used for uplink transmission; the processing unit 402 may also be used to determine the W precodings among the candidate precodings .

For example, when the number of resources used for uplink transmission is A and the number of ports is B, the number of candidate precoders is A*B, where A is a positive integer, and B is a positive integer; furthermore, when the transceiver unit 401 receives the candidate precoding from the terminal device through the resource for uplink transmission, it may be configured to: respectively receive the candidate precoding from the terminal device through A resources for uplink transmission. The terminal equipment receives a group of candidate precodes, which correspond one-to-one to the A resources used for uplink transmission; wherein the group of candidate precodes are sorted from high to low according to the first performance The final A*B candidate precoders are divided into sorting order, and each group of candidate precoders contains B candidate precoders.

In a possible implementation, the first information is used to indicate whether the number of uplink transmission layers is greater than M, which may include: the first information includes a first bit, and the first bit indicates the uplink transmission layer. Whether the number is greater than M; or, the first information includes a first field, the first field is used to indicate the number of activated codewords; when the first field indicates that the number of activated codewords is 1, the The first information indicates that the number of uplink transmission layers is less than or equal to M; when the first field indicates that the number of activated codewords is 2, the first information indicates that the number of uplink transmission layers is greater than M.

In an example, when the first information indicates that the number of uplink transmission layers is less than or equal to M, the W precodes indicated by the first information may be M candidates among the candidate precodes. W candidate precodes among the precoders, the M candidate precoders may be the top M candidate precoders with first performance from high to low among the candidate precoders, and the W is less than or equal to the M, The N is equal to the W.

Optionally, the first information may include first indication information, and the first indication information is used to indicate indices of the W candidate precodings.

In another example, when the first information indicates that the number of uplink transmission layers is greater than M, the W precodes indicated by the first information may be other than M candidates among the candidate precodes. N-M candidate precodes among candidate precodes other than precoding, the N precodes may be the M candidate precodes and the N-M candidate precodes; the M candidate precodes may be the Among the candidate precoders, the first M candidate precoders with first performance from high to low, where the N is greater than the M.

Optionally, the first information may include second indication information, and the second indication information is used to indicate the indexes of the N-M candidate precodings.

It should be noted that the division of units in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods. Each functional unit in the embodiment of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or 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 may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or contributes to the existing technology, 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 several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program code. .

Based on the above embodiments, embodiments of the present application also provide a communication device. Referring to FIG. 5 , the communication device 500 may include a transceiver 501 and a processor 502 . Optionally, the communication device 500 may also include a memory 503. The memory 503 may be disposed inside the communication device 500 or may be disposed outside the communication device 500 . The processor 502 can control the transceiver 501 to receive and send messages, information, messages or data, etc.

Specifically, the processor 502 may be a central processing unit (CPU), a network processor (NP), or a combination of CPU and NP. The processor 502 may further include hardware chips. The above-mentioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (GAL) or any combination thereof.

Wherein, the transceiver 501, the processor 502 and the memory 503 are connected to each other. Optionally, the transceiver 501, the processor 502 and the memory 503 are connected to each other through a bus 504; the bus 504 may be a Peripheral Component Interconnect standard (Peripheral Component Interconnect, PCI) bus or an extended industry standard Structure (Extended Industry Standard Architecture, EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of presentation, only one thick line is used in Figure 5, but it does not mean that there is only one bus or one type of bus.

In an optional implementation, the memory 503 is used to store programs, etc. Specifically, the program may include program code including computer operating instructions. The memory 503 may include RAM, and may also include non-volatile memory (non-volatile memory), such as one or more disk memories. The processor 502 executes the application program stored in the memory 503 to implement the above functions, thereby realizing the functions of the communication device 500 .

For example, the communication device 500 may be the terminal device in the above embodiment; it may also be the network device in the above embodiment.

In one embodiment, when the communication device 500 implements the functions of the terminal device in the above embodiment, the transceiver 501 can implement the sending and receiving operations performed by the terminal device in the above embodiment; the processor 502 can implement the functions in the above embodiment. Operations other than sending and receiving operations performed by the terminal device. For specific relevant descriptions, please refer to the relevant descriptions in the embodiment shown in FIG. 3 , and will not be introduced in detail here.

In another embodiment, when the communication device 500 implements the functions of the network device in the above embodiment, the transceiver 501 can implement the sending and receiving operations performed by the network device in the above embodiment; the processor 502 can implement the above embodiment. Operations other than sending and receiving operations performed by network devices. For specific relevant descriptions, please refer to the relevant descriptions in the embodiment shown in FIG. 3 , and will not be introduced in detail here.

Based on the above embodiments, embodiments of the present application provide a communication system, which may include the terminal equipment and network equipment involved in the above embodiments.

Embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium is used to store a computer program. When the computer program is executed by a computer, the computer can implement what is provided by the embodiment shown in Figure 3. method.

An embodiment of the present application also provides a computer program product. The computer program product is used to store a computer program. When the computer program is executed by a computer, the computer can implement the method provided by the embodiment shown in FIG. 3 .

An embodiment of the present application also provides a chip, including a processor, which is coupled to a memory and configured to call a program in the memory so that the chip implements the method provided by the embodiment shown in FIG. 3 .

An embodiment of the present application also provides a chip, the chip is coupled to a memory, and the chip is used to implement the method provided by the embodiment shown in FIG. 3 .

Those skilled in the art will understand that embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present application. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a use A device for realizing the functions specified in one process or multiple processes of the flowchart and/or one block or multiple blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions The device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device. Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (21)

A communication method, characterized by including: The terminal device receives first information from the network device. The first information is used to indicate W precodings and to indicate whether the number of uplink transmission layers is greater than M, where W is a positive integer and M is a preset uplink transmission layer. Transmission layer threshold; The terminal device determines N precodes based on the W precodes and whether the number of uplink transmission layers is greater than M, and sends uplink data based on the N precodes, where N is greater than or equal to the W integer. The method of claim 1, wherein before the terminal device receives the first information from the network device, the method further includes: The terminal device determines candidate precodes, and the number of candidate precodes is related to the number of resources used for uplink transmission and the number of ports corresponding to the resources used for uplink transmission; The terminal device sends the candidate precoding to the network device through the resource used for uplink transmission, and the W precoding and the N precoding are both included in the candidate precoding. The method of claim 2, wherein when the number of resources used for uplink transmission is A and the number of ports is B, the number of candidate precoders is A*B, and A is a positive integer, and B is a positive integer; The terminal device sends the candidate precoding to the network device through the resource used for uplink transmission, including: The terminal device sorts the A*B candidate precoders from high to low according to the first performance; The terminal device divides the sorted A*B candidate precodes into A group of candidate precodes according to the sorting order, and each group of candidate precodes contains B candidate precodes; The terminal device sends the A group of candidate precodes to the network device through A resources for uplink transmission, and the A group of candidate precodes correspond to the A resources for uplink transmission in a one-to-one correspondence. . The method according to any one of claims 1 to 3, characterized in that the first information is used to indicate whether the number of uplink transmission layers is greater than M, including: The first information includes a first bit, the first bit indicates whether the number of uplink transmission layers is greater than M; or The first information includes a first field, and the first field is used to indicate the number of activated codewords; when the first field indicates that the number of activated codewords is 1, the first information indicates that the The number of uplink transmission layers is less than or equal to M; when the first field indicates that the number of activated codewords is 2, the first information indicates that the number of uplink transmission layers is greater than M. The method according to claim 2 or 3, characterized in that when the first information indicates that the number of uplink transmission layers is less than or equal to M, the W precoding indicated by the first information is the W candidate precodes among the M candidate precodes, the M candidate precodes being the top M candidate precodes with first performance from high to low among the candidate precodes, the W Less than or equal to the M, the N is equal to the W. The method of claim 5, wherein the first information includes first indication information, and the first indication information is used to indicate indices of the W candidate precodings. The method according to claim 2 or 3, characterized in that when the first information indicates that the number of uplink transmission layers is greater than M, the W precodes indicated by the first information are the candidate precodes. N-M candidate precodes among candidate precodes other than M candidate precodes in encoding; the N precodes are the M candidate precodes and the N-M candidate precodes; the M candidate precodes The encoding is the top M candidate precodes with first performance from high to low among the candidate precodes, and the N is greater than the M. The method of claim 7, wherein the first information includes second indication information, and the second indication information is used to indicate indexes of the N-M candidate precodings. A communication method, characterized by including: The network device determines first information. The first information is used to indicate W precodings and to indicate whether the number of uplink transmission layers is greater than M, where W is a positive integer and M is a preset number of uplink transmission layers. threshold; The network device sends the first information to the terminal device, so that the terminal device determines N precodes based on the W precoders and whether the number of uplink transmission layers is greater than M, and the N precoders are used Send uplink data to the terminal device; the N is an integer greater than or equal to the W. The method of claim 9, wherein before the network device determines the first information, the method further includes: The network device receives candidate precodes from the terminal device through resources used for uplink transmission; the number of candidate precodes corresponds to the number of resources used for uplink transmission and the ports corresponding to the resources used for uplink transmission. number related; The network device determines the W precodes among the candidate precodes. The method of claim 10, wherein when the number of resources used for uplink transmission is A and the number of ports is B, the number of candidate precoders is A*B, and A is a positive integer, and B is a positive integer; The network device receives the candidate precoding from the terminal device through the resource used for uplink transmission, including: The network device receives A group of candidate precodes from the terminal device through A resources for uplink transmission, and the A group of candidate precodes corresponds one-to-one to the A resources for uplink transmission; Wherein, the A group of candidate precodes is divided into A*B candidate precodes sorted from high to low according to the first performance in the sorting order, and each group of candidate precodes contains B candidate precodes. The method according to any one of claims 9-11, characterized in that the first information is used to indicate whether the number of uplink transmission layers is greater than M, including: The first information includes a first bit, the first bit indicates whether the number of uplink transmission layers is greater than M; or The first information includes a first field, and the first field is used to indicate the number of activated codewords; when the first field indicates that the number of activated codewords is 1, the first information indicates that the The number of uplink transmission layers is less than or equal to M; when the first field indicates that the number of activated codewords is 2, the first information indicates that the number of uplink transmission layers is greater than M. The method according to claim 10 or 11, characterized in that when the first information indicates that the number of uplink transmission layers is less than or equal to M, the W precoding indicated by the first information is the W candidate precodes among the M candidate precodes, the M candidate precodes being the top M candidate precodes with first performance from high to low among the candidate precodes, the W Less than or equal to the M, the N is equal to the W. The method of claim 13, wherein the first information includes first indication information, and the first indication information is used to indicate indices of the W candidate precodings. The method according to claim 10 or 11, characterized in that when the first information indicates that the number of uplink transmission layers is greater than M, the W precodes indicated by the first information are the candidate precodes. N-M candidate precodes among candidate precodes other than M candidate precodes in encoding; the N precodes are the M candidate precodes and the N-M candidate precodes; the M candidates The precoding is the top M candidate precodings with first performance from high to low among the candidate precodings, and the N is greater than the M. The method of claim 15, wherein the first information includes second indication information, and the second indication information is used to indicate indexes of the N-M candidate precodings. A communication device, characterized by including a processor and a transceiver, wherein: The transceiver is used for communication by the communication device; The processor is configured to call computer instructions stored in the memory to execute the method according to any one of claims 1-8 through the transceiver. A communication device, characterized by including a processor and a transceiver, wherein: The transceiver is used for communication by the communication device; The processor is configured to call computer instructions stored in the memory to execute the method according to any one of claims 9-16 through the transceiver. A computer-readable storage medium, characterized in that computer-executable instructions are stored in the computer-readable storage medium, and when called by the computer, the computer-executable instructions execute any of claims 1-8. The method of any one of claims 9-16, or performing the method of any one of claims 9-16. A computer program product, characterized in that it contains instructions that, when run on a computer, cause the method of any one of claims 1 to 8 to be performed, or cause the method of claims 9 to 16 to be performed Any of the methods described are executed. A chip, characterized in that the chip is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method as described in any one of claims 1-8, or to implement as The method of any one of claims 9-16.