WO2024061120A1

WO2024061120A1 - Communication method, apparatus and system

Info

Publication number: WO2024061120A1
Application number: PCT/CN2023/119045
Authority: WO
Inventors: 阮良; 刘鹍鹏; 刘显达; 董昶钊
Original assignee: 华为技术有限公司
Priority date: 2022-09-21
Filing date: 2023-09-15
Publication date: 2024-03-28
Also published as: CN117792443A

Abstract

A communication method and apparatus, and a system. In the method, a terminal device measures an interference measurement signal to acquire a channel coefficient, further determines interference covariance information, decomposes the interference covariance information, and separately reports the information obtained by decomposition, so that a network device is able to accurately acquire the interference covariance information, which may improve the accuracy of downlink precoding of a network device, and improve communication performance.

Description

Communication methods, devices and systems

This application claims priority to the Chinese patent application filed with the China Patent Office on September 21, 2022, with application number 202211149135.5 and the application title "Communication Method, Device and System", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of communications. In particular, it relates to a communication method, device and system.

Background technique

In time division duplexing (TDD) mode, network equipment can determine downlink (DL) precoding based on uplink (UL) channel information and interference channel information. This precoding can be used by the network equipment to transmit data to terminals. The device sends information, such as sending data, etc. Among them, the network device can obtain the UL channel information based on the sounding reference signal (SRS), and determine the downlink channel information based on the UL channel information. However, currently network equipment can only determine the interference power information based on the channel quality indicator (CQI) reported by the user equipment (UE), but cannot obtain accurate interference channel information, and therefore cannot determine accurate downlink precoding. , resulting in loss of communication performance.

Therefore, how to improve the accuracy of network equipment in obtaining interference channel information and improve communication performance are issues that need to be solved urgently.

Contents of the invention

This application provides a communication method, device and system, which can improve the accuracy of network equipment in obtaining port power and improve communication performance.

In the first aspect, embodiments of the present application provide a communication method. The method can be executed by a terminal device, or can also be executed by a chip or circuit used in the terminal device. This application does not limit this. For convenience of description, the following description takes execution by a terminal device as an example.

The method may include: receiving an interference measurement reference signal, wherein a channel coefficient is obtained by measuring the interference measurement reference signal, the channel coefficient is used to determine a first matrix and N first coefficients, the first matrix is used to determine the precoding corresponding to N SRS ports, N is an integer greater than or equal to 1, each column of the first matrix is of constant modulus, the N first coefficients are used to characterize power information corresponding to the N SRS ports, the N first coefficients correspond one-to-one to the N SRS ports, SRS is sent on O SRS ports among the N SRS ports according to the precoding, O is less than or equal to N, and channel state information CSI is sent, the CSI is used to indicate M first coefficients among the N first coefficients, M is less than or equal to N.

Optionally, the interference measurement reference signal is a non-zero power CSI-RS, or a zero-power CSI-RS.

Optionally, the channel coefficients may also be directly used to determine the precoding corresponding to O SRS ports and M first coefficients.

Optionally, the M first coefficients may be quantized reported quantities.

In this method, the terminal equipment measures the interference measurement signal to obtain the channel coefficients, further determines the interference covariance information, and reports the first matrix and N first coefficients separately, so that the network equipment can accurately obtain the power information and interference covariance of different ports. Variance information can improve communication performance.

Alternatively, the method may be: receiving an interference measurement reference signal, measuring the interference measurement reference signal to obtain a channel coefficient, the channel coefficient being used to determine the first matrix and N first coefficients, when the N first coefficients are all 0 When, SRS is sent on the N SRS ports; when at least one first coefficient among the N first coefficients is not 0, SRS is sent on O SRS ports among the N SRS ports according to the precoding. , O is less than or equal to N, and the channel state information CSI is sent. The CSI is used to indicate the M first coefficients among the N first coefficients. M is less than or equal to N. The first matrix is used to determine the predetermined parameters corresponding to the N SRS ports. Encoding, where N is an integer greater than or equal to 1, each column of the first matrix is constant modulus, the N first coefficients are used to represent the power information corresponding to the N SRS ports, and the N first coefficients are The N SRS ports correspond one to one.

Optionally, the channel coefficients can also be directly used to determine the precoding and M first coefficients corresponding to O SRS ports.

Optionally, the M first coefficients may be quantized reported quantities.

In this method, when the N first coefficients are all 0, there is no need to determine the precoding, and the N first coefficients can be sent through N SRS ports, further saving power consumption.

In connection with the first aspect, in some implementations of the first aspect, the first matrix includes N orthogonal vectors, the N orthogonal vector sums correspond to the N SRS ports one-to-one, and the N orthogonal vectors Each orthogonal vector in is a column in the first matrix.

In conjunction with the first aspect, in some implementations of the first aspect, the first matrix and the N first coefficients are obtained by eigenvalue decomposition of the channel coefficients.

Combined with the first aspect, in some implementations of the first aspect, the interference measurement reference signal is received on N receiving antennas, and the channel coefficient is the interference covariance matrix R_nn corresponding to the N receiving antennas, and the dimension of R_nn is NⅹN, the channel coefficient and the first matrix satisfy the following relationship: R_nn=UΛU^*, where U is a unitary matrix, the first matrix is U^*, and the N first coefficients are Λ^(-1 /2), the dimensions of U, U^* and Λ are NⅹN.

Combined with the first aspect, in some implementations of the first aspect, the interference measurement reference signal is received on the interference measurement resource IMR, the frequency domain bandwidth occupied by the IMR and the scan corresponding to each of the N SRS ports are The bandwidth is the same.

Combined with the first aspect, in some implementations of the first aspect, the N first coefficients correspond to a first subband, the first subband is one of K subbands, and the CSI is also used to indicate the K subbands. The N first coefficients corresponding to each sub-band in the band.

In conjunction with the first aspect, in some implementations of the first aspect, the number of physical resource blocks RB occupied by each subband in the K subbands is determined based on the frequency hopping bandwidth of the N SRS ports, and the K is greater than An integer equal to 1.

In conjunction with the first aspect, in some implementations of the first aspect, the first matrix corresponds to the first subband.

In combination with the first aspect, in certain implementations of the first aspect, the CSI includes a reference coefficient, and a relative value of a first coefficient other than the reference coefficient among the N first coefficients and the reference coefficient, and the reference coefficient belongs to the N first coefficients.

In this method, for multiple first coefficients, a relative value reporting method can be used, such as difference reporting, ratio reporting, etc., which can save overhead.

Combined with the first aspect, in some implementations of the first aspect, when M is less than N, the values of the N-M first coefficients are less than the first threshold value, and when M is equal to N, the values of the M first coefficients The value of at least one first coefficient is less than the first threshold value, and the CSI indicates that the value of the at least one first coefficient is 0.

In this method, for the first coefficient that is smaller than the first threshold value, the terminal device may not report it, or may report 0, which further saves reporting overhead.

Combined with the first aspect, in some implementations of the first aspect, the O is equal to M, and the O ports correspond to the M first coefficients one-to-one.

In connection with the first aspect, in some implementations of the first aspect, before sending SRS on the N SRS ports according to the precoding, the method further includes: determining that at least one first coefficient exists among the N first coefficients. The coefficient is not 0.

In other words, when the N first coefficients are not all 0, the terminal device can determine the precoding and send the SRS according to the precoding. Determining the value of the first coefficient before sending the SRS and determining subsequent steps based on the value can further avoid possible waste of power consumption.

In the second aspect, embodiments of the present application provide a communication method, which can be executed by a network device, or can also be executed by a chip or circuit used in a network device, which is not limited by this application. For convenience of description, the following description takes execution by a network device as an example. The method may include: sending an interference measurement reference signal, the interference measurement reference signal is used to determine a channel coefficient, the channel coefficient is used to determine a first matrix and N first coefficients, the first matrix is used to determine the correspondence of the N SRS ports precoding, N is an integer greater than or equal to 1, each column of the first matrix is constant modulus, the N first coefficients are used to represent the power information corresponding to the N SRS ports, the N first coefficients are The N SRS ports have a one-to-one correspondence. SRS is received on O SRS ports among the N SRS ports, O is less than or equal to N, and channel state information CSI is received. The CSI is used to indicate M among the N first coefficients. The first coefficient, M is less than or equal to N.

Optionally, the M first coefficients may be quantized reported quantities.

Alternatively, the method may also be: sending an interference measurement reference signal, the interference measurement reference signal is used to determine a channel coefficient, the channel coefficient is used to determine a first matrix and N first coefficients, when the N first coefficients are all 0, receiving SRS on the N SRS ports; when at least one first coefficient among the N first coefficients is not 0, receiving SRS on O SRS ports among the N SRS ports, where O is less than or equal to N;

Receive channel state information CSI. The CSI is used to indicate M first coefficients among the N first coefficients, M is less than or equal to N. The first matrix is used to determine the precoding corresponding to the N SRS ports, where N is An integer greater than or equal to 1, each column of the first matrix is constant modulus, the N first coefficients are used to represent the power information corresponding to the N SRS ports, and the N first coefficients are the same as the N SRS ports. One correspondence.

Optionally, the M first coefficients may be quantized reported quantities.

Combined with the second aspect, in some implementations of the second aspect, the first matrix includes N orthogonal vectors, and the N orthogonal vectors correspond to the N SRS ports one-to-one. Among the N orthogonal vectors Each orthogonal vector of is a column in the first matrix.

Combined with the second aspect, in some implementations of the second aspect, the first matrix and the N first coefficients are obtained by eigenvalue decomposition of the channel coefficients.

Combined with the second aspect, in some implementations of the second aspect, the interference measurement reference signal is sent on N transmitting antennas, and the channel coefficient is the interference covariance matrix Rnn corresponding to the N receiving antennas, and the dimension of R_nn is NⅹN, the channel coefficient and the first matrix satisfy the following relationship: R_nn=UΛU^*, where U is a unitary matrix, the first matrix is U*, and the N first coefficients are Λ^(-1/ 2) The main diagonal elements of U, U^* and Λ are NⅹN.

Combined with the second aspect, in some implementations of the second aspect, the interference measurement reference signal is sent on the interference measurement resource IMR, the frequency domain bandwidth occupied by the IMR and the scan corresponding to each SRS port in the N SRS ports The bandwidth is the same.

Combined with the second aspect, in some implementations of the second aspect, the N first coefficients correspond to a first subband, the first subband is one of K subbands, and the CSI is also used to indicate the K subbands. The N first coefficients corresponding to each sub-band in the band.

Combined with the second aspect, in some implementations of the second aspect, the number of physical resource blocks RB occupied by each subband in the K subbands is determined based on the frequency hopping bandwidth of the N SRS ports, and the K is greater than An integer equal to 1.

Combined with the second aspect, in some implementations of the second aspect, the first matrix corresponds to the first subband.

Combined with the second aspect, in some implementations of the second aspect, the CSI includes a reference coefficient, and, the relative value of a first coefficient among the N first coefficients other than the reference coefficient and the reference coefficient, the reference coefficient The coefficient belongs to the N first coefficients.

Combined with the second aspect, in some implementations of the second aspect, when M is less than N, the values of the N-M first coefficients are less than the first threshold value, and when M is equal to N, the values of the M first coefficients The value of at least one first coefficient is less than the first threshold value, and the CSI indicates that the value of the at least one first coefficient is 0.

Combined with the second aspect, in some implementations of the second aspect, O equals M, and the O ports correspond to the M first coefficients one-to-one.

Combined with the second aspect, in some implementations of the second aspect, at least one first coefficient among the N first coefficients is not 0.

It should be understood that the second aspect is a method on the network device side corresponding to the first aspect. The relevant explanations, supplements, and descriptions of beneficial effects of the first aspect are also applicable to the second aspect, and will not be described again here.

In the third aspect, embodiments of the present application provide a communication method, which can be executed by a terminal device, or can also be executed by a chip or circuit used in the terminal device, which is not limited by this application. For convenience of description, the following description takes execution by a terminal device as an example. The method may include: receiving an interference measurement reference signal, measuring the interference measurement reference signal to obtain a channel coefficient, determining a first matrix and N first coefficients according to the channel coefficient, determining the Euclidean distance according to the codebook and the first matrix, and determining the Euclidean distance according to the Euclidean The distance is used to determine the reported amount, and the CSI is sent, and the CSI includes the reported amount.

In this method, the terminal device determines the Euclidean distance through the codebook and the first matrix, and further selects the reporting amount based on the Euclidean distance. Without binding to the port, the network device can obtain accurate interference covariance information and report multiple The first coefficient is used to characterize the port power, allowing network equipment to accurately obtain the power information corresponding to each port, effectively improving reporting accuracy and improving communication performance.

Combined with the third aspect, in some implementations of the third aspect, the first matrix and the N first coefficients are obtained by eigenvalue decomposition of the channel coefficients.

In combination with the third aspect, in certain implementations of the third aspect, the interference measurement reference signal is received on N receiving antennas, the channel coefficient is the interference covariance matrix R_nn corresponding to the N receiving antennas, the dimension of R_nn is N×N, and the channel coefficient and the first matrix satisfy the following relationship: R_nn=UΛU^*, wherein U is a unitary matrix, the first matrix is U^*, the N first coefficients are the main diagonal elements of Λ^(-1/2), and the dimensions of U, U^* and Λ are N×N.

Combined with the third aspect, in some implementations of the third aspect, the N first coefficients correspond to the first subband, and the first subband is K One of the subbands, the CSI is also used to indicate the N first coefficients corresponding to each subband in the K subbands.

Combined with the third aspect, in some implementations of the third aspect, the first matrix corresponds to the first subband.

Combined with the third aspect, in some implementations of the third aspect, the CSI includes a reference coefficient, and the relative value of a first coefficient among the N first coefficients other than the reference coefficient and the reference coefficient, the reference coefficient The coefficient belongs to the N first coefficients.

In combination with the third aspect, in certain implementations of the third aspect, when M is less than N, the values of the N-M first coefficients are less than a first threshold value; when M is equal to N, the value of at least one of the M first coefficients is less than the first threshold value; and the CSI indicates that the value of the at least one first coefficient is 0.

In the fourth aspect, embodiments of the present application provide a communication method, which can be executed by a network device, or can also be executed by a chip or circuit used in a network device, which is not limited by this application. For convenience of description, the following description takes execution by a network device as an example. The method may include: transmitting an interference measurement reference signal, the interference measurement reference signal being used to determine a channel coefficient, and receiving CSI.

Combined with the fourth aspect, in some implementations of the fourth aspect, the first matrix and the N first coefficients are obtained by eigenvalue decomposition of the channel coefficients.

Combined with the fourth aspect, in some implementations of the fourth aspect, the interference measurement reference signal is received on N receiving antennas, the channel coefficient is the interference covariance matrix R_nn corresponding to the N receiving antennas, and the dimension of R_nn is NⅹN, the channel coefficient and the first matrix satisfy the following relationship: R_nn=UΛU^*, where U is a unitary matrix, the first matrix is U^*, and the N first coefficients are Λ^(-1 /2), the dimensions of U, U^* and Λ are NⅹN.

Combined with the fourth aspect, in some implementations of the fourth aspect, the N first coefficients correspond to a first subband, the first subband is one of K subbands, and the CSI is also used to indicate the K subbands. The N first coefficients corresponding to each sub-band in the band.

Combined with the fourth aspect, in some implementations of the fourth aspect, the first matrix corresponds to the first subband.

Combined with the fourth aspect, in some implementations of the fourth aspect, the CSI includes a reference coefficient, and the relative value of a first coefficient among the N first coefficients other than the reference coefficient and the reference coefficient, the reference coefficient The coefficient belongs to the N first coefficients.

Combined with the fourth aspect, in some implementations of the fourth aspect, when M is less than N, the values of the N-M first coefficients are less than the first threshold value, and when M is equal to N, the values of the M first coefficients The value of at least one first coefficient is less than the first threshold value, and the CSI indicates that the value of the at least one first coefficient is 0.

In the fifth aspect, embodiments of the present application provide a communication device. The device includes a processing module and a transceiver module. The transceiver module can be used to receive an interference measurement reference signal. The transceiver module can also be used to perform processing on the N parameters based on the precoding. SRS is sent on O SRS ports, O is less than or equal to N; the transceiver module can also be used to send channel state information CSI, which is used to indicate M first coefficients among the N first coefficients, M Less than or equal to N; the processing module can be used to measure the interference measurement signal to obtain the channel coefficient; the processing module can also be used to determine the first matrix and N first coefficients according to the channel coefficient.

In a sixth aspect, embodiments of the present application provide a communication device. The communication device includes a transceiver module and a processing module. The transceiver module is used to send interference measurement reference signals. The transceiver module is also used to receive SRS; the transceiver module is also used to Receive CSI.

In a seventh aspect, embodiments of the present application provide a communication device. The device includes a processing module and a transceiver module. The transceiver module can be used to receive interference measurement reference signals. The transceiver module can also be used to send CSI; the processing module can be used. The channel coefficient is obtained by measuring the interference measurement signal; the processing module can also be used to determine the first matrix and N first coefficients according to the channel coefficient; the processing module can also be used to determine the Euclidean distance according to the first matrix and the codebook.

In an eighth aspect, embodiments of the present application provide a communication device. The device includes a processing module and a transceiver module. The transceiver module can be used to send interference measurement reference signals, and the transceiver module can also be used to receive CSI.

It should be understood that the fifth, sixth, seventh and eighth aspects are device-side implementations corresponding to the first, second, third and fourth aspects respectively. The first and second aspects The relevant explanations, supplements, possible implementation methods, and descriptions of beneficial effects of aspects, third aspects, and fourth aspects are also applicable to the fifth, sixth, seventh, and eighth aspects respectively, and will not be repeated here.

In a ninth aspect, embodiments of the present application provide a communication device, including an interface circuit and a processor. The interface circuit is used to implement the functions of the transceiver module in the fifth aspect or the seventh aspect. The processor is used to implement the fifth aspect or the seventh aspect. The function of the processing module in the seventh aspect.

In a tenth aspect, embodiments of the present application provide a communication device, including an interface circuit and a processor. The interface circuit is used to implement the functions of the transceiver module in the sixth or eighth aspect. The processor is used to implement the sixth or eighth aspect. The functions of the processing module in the eighth aspect.

In an eleventh aspect, an embodiment of the present application provides a computer-readable medium, the computer-readable medium storing a program code for execution by a terminal device, the program code including a program for executing the first aspect or the third aspect, or any possible one of the first aspect or the third aspect. manner, or, instructions for the method of all possible manners in the first aspect or the third aspect.

In a twelfth aspect, embodiments of the present application provide a computer-readable medium that stores program code for execution by a network device, where the program code includes execution of the second aspect or the fourth aspect, or, Any possible method in the second aspect or the fourth aspect, or instructions for all possible methods in the second aspect or the fourth aspect.

A thirteenth aspect provides a computer program product storing computer-readable instructions. When the computer-readable instructions are run on a computer, the computer causes the computer to execute the above-mentioned first aspect or third aspect, or the first aspect or Any possible way in the third aspect, or all possible ways in the first aspect or the third aspect.

A fourteenth aspect provides a computer program product that stores computer-readable instructions. When the computer-readable instructions are run on a computer, the computer is caused to execute the above-mentioned second aspect or fourth aspect, or the second aspect or Any possible way in the fourth aspect, or all possible ways in the second aspect or the fourth aspect.

In a fifteenth aspect, a communication system is provided, which communication system includes a possible way to implement the first aspect or the third aspect, or any of the first aspect or the third aspect, or the first aspect or the third aspect. All possible ways, methods and various possible designed functional devices in the three aspects and the second aspect or the fourth aspect, or any possible way in the second aspect or the fourth aspect, or, the second aspect or the third aspect All possible ways, methods and devices with various possible designed functions in the four aspects.

In the sixteenth aspect, a processor is provided, which is coupled to a memory and is used to execute the method of the above-mentioned first aspect or third aspect, or any possible manner in the first aspect or third aspect, or all possible manners in the first aspect or third aspect.

A seventeenth aspect provides a processor, coupled to a memory, for executing the above second aspect or the fourth aspect, or any possible method of the second aspect or the fourth aspect, or the second aspect. method in all possible ways in aspect or fourth aspect.

An eighteenth aspect provides a chip system. The chip system includes a processor and may also include a memory for executing computer programs or instructions stored in the memory, so that the chip system implements any of the foregoing first to fourth aspects. Methods in one aspect, and in any possible implementation of either aspect. The chip system can be composed of chips or include chips and other discrete devices.

A nineteenth aspect provides a computer program product that stores computer-readable instructions. When the computer-readable instructions are run on a computer, the computer causes the computer to execute the above-mentioned first aspect or third aspect, or the first aspect or Any possible implementation method in the third aspect, or all possible implementation methods in the first aspect or the third aspect.

A twentieth aspect provides a computer program product that stores computer-readable instructions. When the computer-readable instructions are run on a computer, the computer is caused to execute the above-mentioned second aspect or fourth aspect, or the second aspect or Any possible way in the fourth aspect, or all possible implementation methods in the second aspect or the fourth aspect.

A twenty-first aspect provides a communication system, including at least one communication device according to the fifth aspect and/or at least one communication device according to the sixth aspect, the communication system being used to implement the first aspect or the second aspect. aspect, or any possible implementation method in the first aspect or the second aspect, or all possible implementation methods in the first aspect or the second aspect.

In a twenty-second aspect, a communication system is provided, including at least one communication device according to the seventh aspect and at least one communication device according to the eighth aspect. The communication system is used to implement the above third or fourth aspect, Or, any possible method in the third aspect or the fourth aspect, or all possible implementation methods in the third aspect or the fourth aspect.

Description of the drawings

Figure 1 shows a system architecture applicable to the embodiment of the present application.

Figure 2 shows a schematic diagram of the relationship between a system frame, time slots within the system frame, and OFDM symbols within the time slots.

Figure 3 shows a configuration method of uplink and downlink frames.

Figure 4 shows a schematic diagram of a communication method proposed by an embodiment of the present application.

Figure 5 shows a schematic diagram of an SRS loading method proposed by an embodiment of the present application.

Figure 6 shows a schematic diagram of yet another communication method proposed by the embodiment of the present application.

Figure 7 shows a schematic block diagram of a communication device proposed in an embodiment of the present application.

FIG8 shows a schematic block diagram of another communication device proposed in an embodiment of the present application.

Detailed ways

The technical solutions in this application will be described below with reference to the accompanying drawings.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: long term evolution (long term evolution, LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex) , TDD), global interoperability for microwave access (WiMAX) communication system, fifth generation (5th generation, 5G) system, new radio (new radio, NR) or future network, etc., as described in this application The 5G mobile communication system includes a non-standalone (NSA) 5G mobile communication system or a standalone (SA) 5G mobile communication system. The technical solution provided by this application can also be applied to future communication systems, such as the sixth generation mobile communication system. The communication system may also be a public land mobile network (PLMN) network, a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, or a device-to-device (D2D) communication system. Internet of Things (IoT) communication system or other communication system.

Terminal equipment (terminal equipment) in the embodiments of this application may refer to access terminal, user unit, user station, mobile station, mobile station, relay station, remote station, remote terminal, mobile device, user terminal (user terminal), user equipment (user equipment, UE), terminal, wireless communication equipment, user agent or user device. The terminal device may also 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 device with wireless communications Functional handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or terminals in future evolved public land mobile communications networks (PLMN) Equipment or terminal equipment in future Internet of Vehicles, etc., the embodiments of this application are not limited to this.

In addition, in the embodiment of this application, the terminal device may also be a terminal device in the IoT system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing human-machine Interconnection, an intelligent network that interconnects things. In the embodiment of this application, IOT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrowband (NB) technology.

In addition, in the embodiment of this application, the terminal device may also include a sensor, whose main functions include collecting data (part of the terminal device), receiving control information and downlink data of the network device, and sending electromagnetic waves to transmit uplink data to the network device.

The network device in the embodiment of the present application may be any communication device with wireless transceiver functions used to communicate with terminal devices. The equipment includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (Node B, NB), home base station (home evolved NodeB, HeNB, or home Node B, HNB), baseband unit (baseBand unit, BBU), access point (AP), wireless relay node, wireless backhaul node, transmission point in the wireless fidelity (wireless fidelity, WIFI) system (transmission point, TP) or transmission and reception point (TRP), etc., can also be a 5G system, such as a gNB in an NR system, or a transmission point (TRP or TP), a base station in a 5G system One or a group (including multiple antenna panels) of antenna panels, or it can also be a network node that constitutes a gNB or transmission point, such as a baseband unit (BBU), or a distributed unit (DU), etc.

In some deployments, the network device in the embodiment of the present application may refer to a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU), or the network device includes a CU and a DU. The gNB may also include an active antenna unit (AAU). CU implements some functions of gNB, and DU implements some functions of gNB. For example, CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and packet data convergence protocol (PDCP) layer functions. DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, media access control (MAC) layer and physical (physical, PHY) layer. AAU implements some physical layer processing functions, radio frequency processing and active antenna related functions. Since RRC layer information will eventually become PHY layer information, or transformed from PHY layer information, in this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by DU , or sent by DU+AAU. It can be understood that the network device may be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU can be divided into network equipment in the access network (radio access network, RAN), or the CU can be divided into network equipment in the core network (core network, CN), which is not limited in this application.

Further, the CU can also be divided into a central unit on the control plane (CU-CP) and a central unit on the user plane (CU-UP). Among them, CU-CP and CU-UP can also be deployed on different physical devices. CU-CP is responsible for the control plane function, mainly including the RRC layer and PDCP-C layer. The PDCP-C layer is mainly responsible for encryption and decryption of control plane data, integrity protection, data transmission, etc. CU-UP is responsible for user plane functions, mainly including the SDAP layer and PDCP-U layer. The SDAP layer is mainly responsible for processing core network data and mapping flows to bearers. The PDCP-U layer is mainly responsible for at least one function such as encryption and decryption of the data plane, integrity protection, header compression, serial number maintenance, and data transmission. Specifically, CU-CP and CU-UP are connected through a communication interface (eg, E1 interface). CU-CP represents network equipment connected to core network equipment through communication interfaces (for example, Ng interface), and DU through communication interfaces (for example, F1-C (control plane) interface). connect. CU-UP is connected to DU through a communication interface (for example, F1-U (user plane) interface).

There is also a possible implementation where the PDCP-C layer is also included in CU-UP.

It can be understood that the above protocol layer divisions between CU and DU, and CU-CP and CU-UP are only examples, and there may be other division methods, which are not limited in the embodiments of this application.

The network device mentioned in the embodiments of the present application may be a device including a CU, or a DU, or a device including a CU and a DU, or a device including a control plane CU node (CU-CP node) and a user plane CU node (CU-UP node) and a DU node.

Network equipment and terminal equipment can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and satellites in the sky. In the embodiments of this application, the scenarios in which network devices and terminal devices are located are not limited.

In this embodiment of the present application, the terminal device or network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. This hardware layer includes hardware such as central processing unit (CPU), memory management unit (MMU) and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as Linux operating system, Unix operating system, Android operating system, iOS operating system or windows operating system, etc. This application layer includes applications such as browsers, address books, word processing software, and instant messaging software.

Additionally, various aspects or features of the present application may be implemented as methods, apparatus, or articles of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, tapes, etc.), optical disks (e.g., compact discs (CD), digital versatile discs (DVD)) etc.), smart cards and flash memory devices (e.g. erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.). Additionally, the various storage media described herein may represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and/or carrying instructions and/or data.

In order to facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first described in detail, taking the communication system shown in FIG. 1 as an example. As shown in FIG. 1 , the communication system 100 may include at least one network device, such as the network device 101 shown in FIG. 1 . The communication system 100 may also include at least one terminal device, such as the terminal devices 102 to 107 shown in FIG. 1 . Among them, the terminal devices 102 to 107 can be mobile or fixed. Network device 101 and one or more of terminal devices 102 to 107 may each communicate via wireless links. Each network device can provide communication coverage for a specific geographical area and can communicate with end devices located within that coverage area.

Optionally, terminal devices can communicate directly with each other. For example, device to device (D2D) technology can be used to achieve direct communication between terminal devices. As shown in Figure 1, D2D technology can be used to communicate directly between terminal devices 105 and 106, and between terminal devices 105 and 107. Terminal device 106 and terminal device 107 may communicate with terminal device 105 individually or simultaneously.

The terminal devices 105 to 107 can also communicate with the network device 101 respectively. For example, it can directly communicate with the network device 101. The terminal devices 105 and 106 in the figure can communicate directly with the network device 101; it can also communicate with the network device 101 indirectly, such as the terminal device 107 in the figure communicates with the network device via the terminal device 105. 101 Communication.

Each communication device can be configured with multiple antennas. For each communication device in the communication system 100, the configured plurality of antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. Therefore, communication devices in the communication system 100 can communicate through multi-antenna technology.

It should be understood that FIG1 is only a simplified schematic diagram for ease of understanding, and the communication system 100 may also include other network devices or other terminal devices, which are not shown in FIG1 .

In order to facilitate understanding of the embodiments of the present application, several basic concepts involved in the embodiments of the present application are briefly explained. It should be understood that the basic concepts introduced below are simply explained by taking the basic concepts specified in the NR protocol as an example, but this does not limit the embodiments of the present application to only be applicable to the NR system. Therefore, the standard names that appear when describing the NR system as an example are all functional descriptions. The specific names are not limited. They only represent the functions of the equipment and can be extended to other systems in the future.

1. Precoding technology

When the channel state is known, the terminal device can process the signal to be sent with the help of a precoding matrix that matches the channel state, so that the precoded signal to be sent adapts to the channel, so that the received signal of the receiving device Increases intensity and reduces interference to other receiving devices. Therefore, by precoding the signal to be transmitted, the received signal quality (eg, signal to interference plus noise ratio (SINR), etc.) is improved.

It should be understood that the relevant descriptions of precoding technology in this application are only examples to facilitate understanding and are not used to limit the scope of protection of the embodiments of this application. In the specific implementation process, the sending device can also perform precoding in other ways. For example, when the channel information (such as but not limited to the channel matrix) cannot be obtained, a preset precoding matrix or weighting processing method is used to perform precoding. For the sake of brevity, its specific content will not be repeated in this application.

2. Precoding matrix

The precoding matrix is used to characterize the relationship between the amplitude and phase of each antenna when a transmitter with multi-antenna transmission capabilities transmits signals. For example, for the FDD system, when the UE reports channel state information (channel state information, CSI), the precoding matrix can be used to characterize the measurement of multiple channel state information reference signal (channel state information reference signal, CSI-RS) ports. The obtained quantized information of the amplitude and phase coefficients of the channel on each CSI-RS port of the UE. For TDD systems, since the base station can obtain the channel information of each transmitting antenna of the UE based on the sounding reference signal (SRS), the base station can determine the amplitude and phase of each antenna when the UE transmits data based on the channel information of the UE, that is, the UE The precoding matrix used when sending data. The precoding matrix may be determined by the terminal device through channel estimation or other methods or based on channel reciprocity. However, it should be understood that the specific method for the terminal device to determine the precoding matrix is not limited to the above. The specific implementation method may refer to the existing technology. For the sake of simplicity, they will not be listed here one by one.

For example, the precoding matrix can be obtained by performing singular value decomposition (SVD) on the channel matrix or the covariance matrix of the channel matrix, or by performing eigenvalue decomposition (EVD) on the covariance matrix of the channel matrix. It should be understood that the methods for determining the precoding matrix listed above are only examples and should not constitute any limitation to the present application. The methods for determining the precoding matrix can refer to the prior art and are not listed here for brevity.

3. Channel reciprocity

In the time division duplexing (TDD) mode, uplink and downlink channels transmit signals on different time domain resources on the same frequency domain resources. Within a relatively short period of time (e.g., the coherence time of channel propagation), it can be considered that the channels experienced by the signals on the uplink and downlink channels are the same, and the uplink and downlink channels can be obtained equivalently to each other. This is the reciprocity of the uplink and downlink channels. Based on the reciprocity of the uplink and downlink channels, network equipment can measure the uplink channel based on the uplink reference signal, such as the sounding reference signal (SRS). And the downlink channel can be estimated based on the uplink channel, so that the precoding matrix used for downlink transmission can be determined.

4. Reference signal port (SRS port)

The reference signal port is the resource granularity occupied by a terminal device for sending reference signals.

As a possible implementation, one reference signal port may correspond to a transmitting antenna of a terminal device. In this implementation, the number of reference signal ports of the terminal device may be the number of transmitting antennas of the terminal device.

As another possible implementation, a reference signal port can correspond to a precoding vector of the transmitting antenna, that is, it can correspond to a spatial beamforming direction. In this implementation, the number of reference signal ports of the terminal device can be smaller than that of the terminal. The number of transmit antennas of the device.

Normally, multiple reference signals corresponding to multiple reference signal ports on one reference signal resource occupy one or more time-frequency resources, and multiple reference signals occupying the same time-frequency resource are multiplexed through code division. . For example, reference signals from different reference signal ports use different cyclic shifts (CS) to occupy the same time-frequency resource.

Specifically, on the same time-frequency resource, different reference signals at different reference signal ports can avoid interference with each other through code division multiplexing in an orthogonal manner. This orthogonal manner can be implemented through cyclic shifting. When the channel delay spread is small, CS can basically achieve code division orthogonality. Through specific operations, the receiving end can eliminate signals using other CSs and retain only signals using specific CSs, thereby achieving code division multiplexing.

In this embodiment of the present application, the reference signal port may be an SRS port or a CSI-RS port.

5. Reference signal (RS)

RS can also be called pilot, reference sequence, etc. In this embodiment of the present application, the reference signal may be a reference signal used for channel measurement. For example, the reference signal may be a channel state information reference signal (CSI-RS) used for downlink channel measurement, or it may be a sounding reference signal (Sounding reference signal, SRS) used for uplink channel measurement.

It should be understood that the reference signals listed above are only examples and should not constitute any limitation on the present application. This application does not exclude the possibility of defining other reference signals in future agreements to achieve the same or similar functions, nor does it exclude the possibility of defining other reference signals in future agreements. Possibility of realizing different functions.

For ease of description, the following uses the reference signal SRS as an example. In the 5G NR communication system, SRS is used to estimate the channel quality of different frequency bands.

Specifically, the period configuration of SRS is related to the frame structure. Before introducing the period configuration of SRS, the frame is briefly described with reference to FIG2 , which is a schematic diagram of the relationship between a system frame, a time slot in the system frame, and an OFDM symbol in the time slot.

The first row in Figure 2 shows multiple system frames. A rectangular grid is a system frame, and n _f represents the sequence number of the system frame. The second line in Figure 2 shows multiple time slots included in a system frame, n _{s, f} represents the sequence number of the time slot in the system frame, Indicates the number of time slots included in one system frame. The third row in Figure 2 shows multiple OFDM symbols included in one time slot, n _o,s represents the sequence number of OFDM symbols in the time slot, Indicates the number of OFDM symbols included in a slot.

Optionally, the system frame may also be called a frame, or a wireless frame, etc. For example, the time slots involved in this application include flexible time slots, downlink time slots and uplink time slots. Among them, the downlink time slot is only used for downlink transmission. For example, the downlink time slot is used to carry downlink data and/or downlink control information. The uplink time slot is only used for uplink transmission. For example, the uplink time slot is used to carry uplink data and/or uplink control information. Flexible time slots can be used for both uplink and downlink transmission. For example, the uplink transmission symbols in the flexible time slots can be used for the transmission of uplink control information and reference signals SRS, and the downlink transmission symbols can be used for the transmission of downlink control information. Of course, flexible time slots can also be used for the transmission of downlink data or uplink data. For the convenience of description, "S" is used to represent the flexible time slot, "D" is used to represent the downlink time slot, and "U" is used to represent the uplink time slot.

The currently configurable SRS period is T _SRS =n*T _SLOT , where T _SLOT is the duration of the slot, and n is 5 or an integral multiple of 5. SRS transmission is triggered on a part of the uplink slots in each SRS cycle. Candidate uplink slots that can be used for SRS transmission must meet:

Among them, T _SRS is the minimum number of slots between two consecutive SRS transmissions.

Specifically, the same SRS resource occupies the OFDM symbol with the same sequence number in the slot that meets the above conditions. As shown in FIG3 , FIG3 is an uplink and downlink frame configuration method.

As can be seen from Figure 3, the period of SRS is T _SRS =n*T _SLOT , and n can only be 5 or an integral multiple of 5.

For example, the SRS cycle is 5 slots, and T _SRS =5*T _SLOT is configured. In each "S" type slot, the resources of OFDM symbols with the same sequence number are used to configure SRS.

It should be understood that the reference signal listed above is SRS is only an example and should not constitute any limitation on this application. This application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

6. Reference signal resources.

Reference signal resources can be used to configure the transmission attributes of the reference signal, such as time-frequency resource location, port mapping relationship, power factor, scrambling code, etc. The transmitting end device may send the reference signal based on the reference signal resources, and the receiving end device may receive the reference signal based on the reference signal resources. A reference signal resource may include one or more resource blocks (RBs).

In this embodiment of the present application, the reference signal resource may be an SRS resource, for example.

In TDD mode, network equipment can determine precoding based on channel information and interference channel information. The precoding can be used to send information, such as data. The network device can obtain the UL channel information based on the SRS, and determine the DL channel information based on the UL channel information. However, since the interference channels of UL and DL do not have reciprocity, the network equipment cannot measure the interference channel information of the downlink channel through SRS. In this case, the network device cannot determine the downlink precoding, and thus cannot implement resource scheduling. Currently, the square root of the inverse interference covariance matrix can be estimated through CSI-RS or demodulation reference signal (DMRS) as interference channel information to determine downlink precoding. However, the eigenvalues of the square root of the inverse interference covariance matrix are very different. Precoding according to the square root of the inverse interference covariance matrix will lead to large differences in power between different SRS ports. For example, some The power allocated to the SRS port is very small and cannot send and receive information normally, seriously affecting communications. In addition, because the network equipment cannot obtain accurate interference channel information, it is further unable to determine accurate downlink precoding, resulting in a loss of communication performance.

For example, in a communication scenario where interference exists, the UE can only first obtain the channel information and interference channel information through the measurement of the downlink reference signal, and then notify the base station (an example of network equipment) of the UE through the CQI carried in the CSI. Interference power level. CQI is used to reflect the signal to interference plus noise ratio (SINR) (signal to interference plus noise ratio, SINR) (the ratio of the power of the useful signal to the power of the interference and noise) calculated by the UE. ). Among them, the useful signal is measured according to the channel measurement resource (CMR), and the interference signal is measured according to the interference measurement resource (IMR). CQI can only characterize The ratio of signal and interference power levels does not carry interference covariance information (ie, interference channel information). Since the base station can only obtain the interference power level from the CQI carried in the CSI reported by the UE, there is no interference covariance matrix information, resulting in inaccurate precoding on the base station side. This is because the optimal precoding selection criterion is the maximization capacity criterion, and the capacity calculation formula includes interference covariance matrix items.

specifically:

Assuming that the precoding selection criterion on the base station side is linear precoding based on the maximum capacity criterion, the base station needs to obtain the interference covariance matrix information to calculate the optimal precoding:

For the case of single UE-multiple input multiple output (SU-MIMO), the optimal precoding selection criterion is to maximize:
maxlogdet(I+W ^H H ^H R ^-1 nnHW)

Among them, W is the DL precoding matrix, H is the DL channel, Rnn is the DL interference covariance matrix, and det is the determinant operation.

For single UEs-multiple input multiple output (MU-MIMO), the optimal precoding selection criterion is to maximize:

Among them, the Rnn term is the DL neighboring cell interference covariance matrix, _wk is the DL precoding matrix of the target UE, _Hk is the DL channel of the target UE, _wk is the DL precoding matrix of the target UE, and _wm is the DL precoding matrix of the interfering UE. The target UE is the target terminal to which the base station sends information. The target UE is in the current cell, the neighboring cell is the cell adjacent to the current cell, or the neighboring cell is the cell that causes the most serious interference to the UE in the current cell, and the interfering UE is the UE in the neighboring cell.

When reporting CSI, the UE will feedback a rank value and the corresponding CQI. After receiving the CSI, the base station can obtain the CQI corresponding to the rank value reported by the UE. The rank value is determined by the rank of the channel obtained by the UE based on the CSI-RS. On the one hand, as mentioned above, the CQI does not include interference covariance matrix information, that is to say, the base station cannot obtain the Rnn term in the above formula through CQI reporting. In this way, the base station can only determine the Rnn term in the above formula based on the interference power value reflected by the CQI and assuming that the interference is Gaussian white noise, which deviates from the Rnn term during actual transmission. On the other hand, the base station will comprehensively consider the business needs of the UE during actual data transmission, as well as the channel information and business needs of other UEs in the communication system to comprehensively determine the rank of the UE. This rank value deviates from the rank value reported by the UE. , that is to say, the CQI when the base station uses a certain rank value for actual transmission will deviate from the CQI reported by the UE. Therefore, the base station needs to calculate the CQI based on the actual rank value, and the base station needs to calculate the CQI based on the interference covariance information.

In order to solve this problem, for the case of SU/MU-MIMO, the optimal precoding selection criterion can be transformed:

can use Pre-whitening SRS, that is, converting As precoding is carried on the SRS, the base station senses the equivalent channel after interference whitening, for example:

The signal model is: y=HFx+n, where n is interference plus noise, R _nn =E(nn ^H ),

Interference whitening: in

The base station can be based on the whitened channel To implement link adaptation and precoding design, specifically, you can Precode SRS so that the base station can obtain it based on SRS

However, the above is the square root of the inverse interference covariance matrix estimated by CSI-RS/DMRS. A possible implementation is: It is obtained by SVD or EVD decomposition based on the interference covariance matrix. The power corresponding to each column of corresponds to the size of the eigenvalue obtained by the above decomposition. Usually, the size of each eigenvalue of the channel matrix is quite different. After precoding SRS, there will be power differences between SRS ports, and the SRS power control mechanism will be destroyed. At the same time, since the total power remains unchanged, the power allocated to some ports will be very small, affecting When the base station senses that the interference state has changed, it cannot fall back. For example, the base station cannot determine how to determine the CQI corresponding to the rank value after the fallback, and thus cannot determine the downlink precoding, which may lead to a loss of communication performance.

In response to the above problems, embodiments of this application propose a communication method that can accurately report interference channel information, improve network device precoding accuracy, and improve communication performance. As shown in Figure 4, the method may include the following steps:

Step 401: The network device sends an interference measurement signal to the terminal device, and accordingly, the terminal device receives the interference measurement signal.

The terminal equipment can measure the interference measurement signal to obtain the channel coefficient. The channel coefficients may be used to determine a first matrix and N first coefficients. The first matrix may be used to determine precoding corresponding to N SRS ports, where N is an integer greater than or equal to 1.

Among them, each column of the first matrix is constant modulus. In other words, the sum of the modular squares of the columns of the first matrix is equal. Among them, the modular sum of a certain column in the matrix can be understood as the sum of the squares of the absolute values of the real and imaginary parts of each complex element included in the column. In one possible way, the first matrix includes N orthogonal vectors, the N orthogonal vectors correspond to N SRS ports one-to-one, and each orthogonal vector among the N orthogonal vectors is a column of the first matrix.

The above-mentioned N first coefficients can be used to represent the power information corresponding to the N SRS ports, and these N first coefficients correspond to the N SRS ports one-to-one.

In one possible implementation, the first matrix and the N first coefficients can be obtained by eigenvalue decomposition of the channel coefficients. For example, the first matrix, N first coefficients and channel coefficients may satisfy the following relationship:

in,

H is the channel coefficient, U ^* is the first matrix, U is the unitary matrix, the main diagonal elements of Λ ^-1/2 are the N first coefficients, and P is the intermediate variable in the above matrix operation. Rnn is the interference covariance matrix. Optionally, the interference covariance matrix is the interference covariance matrix corresponding to N receiving antennas.

In one possible implementation, when the terminal device receives the interference measurement signal, it may receive the interference measurement signal on the interference measurement resource. The frequency domain bandwidth occupied by the interference measurement resource is the same as the scanning bandwidth corresponding to each SRS port among the N SRS ports. Among them, the frequency domain bandwidth occupied by the interference measurement resource can be understood as the number of RBs or the frequency domain bandwidth included from the frequency domain starting resource element (resource element, RE) of the interference measurement resource to the frequency domain ending RE. For example, the starting RB occupied by the interference measurement resource in the frequency domain (that is, the RB where the starting RE is located) is RB#1, and the ending RB (that is, the RB where the ending RE is located) is RB#4. Then the interference measurement resource is in the frequency domain. The bandwidth occupied on the domain is 4 RBs.

The scanning bandwidth corresponding to the SRS port can be understood as the number of RBs or the frequency domain bandwidth included between the frequency domain starting RE and the frequency domain ending RE occupied by the SRS port in the frequency domain. For example, the starting RB occupied by the SRS port in the frequency domain (that is, the RB where the starting RE is located) is RB#1, and the ending RB (that is, the RB where the ending RE is located) is RB#3. Then the SRS port is in the frequency domain. The occupied bandwidth is 3 RBs. In other words, the scanning bandwidth corresponding to the SRS port includes the bandwidth of the frequency domain resources occupied by the SRS port. For example, the scanning bandwidth corresponding to N SRS ports includes the bandwidth of frequency domain resources occupied by the N SRS ports.

Correspondingly, the dimension of R _nn is NⅹN, and the dimensions of U, U* and Λ are all NⅹN.

Optionally, the above-mentioned N first coefficients correspond to a first subband, and the first subband is one of the K subbands. The K subbands belong to the frequency domain resources occupied by the SRS port. In other words, the above-mentioned N first coefficients are at the subband level. That is to say, each subband will correspond to a set of first coefficients. In other words, the N SRS ports send information on each subband, such as sending SRS. For example, K takes a value of 3, and the three subbands are subband 1, subband 2, and subband 3, respectively, where the first subband can be subband 1, subband 1 corresponds to N first coefficients, subband 2 corresponds to M first coefficients, and subband 3 corresponds to P first coefficients. The values of M and P may be the same as or different from N.

In one possible way, the number of RBs occupied by each subband in the K subbands may be determined based on the frequency hopping bandwidth of the N SRS ports. Assuming that each SRS port among the N SRS ports occupies the same bandwidth, the SRS scanning bandwidth may be the SRS bandwidth occupied by each SRS port, that is, the bandwidth included between the start RE and the end RE carrying SRS. The SRS frequency hopping bandwidth may be the bandwidth occupied by one (or single) SRS transmission, or the bandwidth carrying SRS in one time unit (such as one OFDM symbol).

For example, as shown in Figure 5, taking the subband of the interference measurement resource as an example, the value of K is 4, and the interference measurement resource includes 4 subbands, and the 4 subbands are subband 1, subband 2, and subband 3 respectively. , subband 4. The bandwidth of each of the four subbands may be determined according to its corresponding SRS frequency hopping bandwidth. For example, the four subbands may be the same as its corresponding SRS frequency hopping bandwidth. Each sub-band corresponds to each frequency hopping bandwidth one-to-one. In other words, the bandwidth of the subband is equal to the frequency hopping bandwidth.

In another possible way, the above-mentioned first matrix corresponds to the first sub-band among the K sub-bands. In other words, the first matrix can also be sub-band level. In other words, each subband will correspond to a first matrix. For example, K sub-bands may correspond to K first matrices, and the K sub-bands correspond to the K first matrices one-to-one.

Step 402: The terminal device sends an SRS to the network device, and accordingly, the network device receives the SRS.

The terminal device may send SRS on O SRS ports among the N SRS ports according to the interference measurement signal received in step 401, where O is less than or equal to N. That is to say, the terminal device can be connected to some ports or all of the N SRS ports. Send SRS to the network device on the external port.

Wherein, the terminal device may determine the first matrix according to the interference measurement signal. Specifically: the terminal equipment receives the interference measurement signal. If the interference measurement signal is broadband level (it can also be understood that the bandwidth corresponding to the interference measurement signal does not distinguish subbands), the terminal equipment can be based on the interference measurement signal corresponding to the broadband level. Perform channel estimation on the sequence, determine the channel information, and then determine the first matrix based on the channel information. If the interference measurement signal is at the subband level, the terminal device performs channel estimation based on the sequence corresponding to the interference measurement signal on each subband, determines the channel information of each subband, and then determines the first matrix based on the channel information.

For example, a possible implementation in which the terminal device determines precoding according to the first matrix is as follows:

The terminal device can synthesize a channel element based on the signal received on the RE occupied by each subband of each subband, and the terminal device loads the channel element on the corresponding frequency hopping bandwidth. When the terminal device has multiple receiving antenna ports, taking a subband in Figure 5, such as subband 1, as an example, the signal (such as receiving channel information) received by the terminal device on each RE on subband 1 is H (m*n), where m is the number of receiving antennas and n is the number of REs on subband 1. The terminal device can obtain the interference covariance matrix according to the received channel information: Rnn=HH ^H (m*m). The terminal device then performs eigenvalue decomposition of Rnn to obtain the first matrix U ^* (m*m), and loads each column of the first matrix onto the m SRS ports in sequence. In this way, the terminal device sends data to the network device through the SRS port. The SRS can carry the information of the first matrix. For example, load the first column element of the first matrix U ^* on SRS port 1, load the second column element of the first matrix U ^* on SRS port 2, and load the third column element of the first matrix U ^* on SRS port 3. column elements, etc. One column in the first matrix U ^* corresponds to one SRS port among the m SRS ports.

In other words, the terminal device synthesizes a channel element based on each element on subband 1, and multiplies the channel element with the sequence point of the SRS on the frequency hopping bandwidth to obtain the precoding. In this way, the SRS sent by the terminal device to the network device carries the information of the first matrix U ^* determined according to Rnn.

Step 403: The terminal device sends CSI to the network device, and correspondingly, the network device receives the CSI.

The CSI may be used to indicate M first coefficients among N first coefficients, where M is less than or equal to N. It can be understood that when M is less than N, the CSI is used to indicate part of the N first coefficients; when M is equal to N, the CSI is used to indicate all of the N first coefficients.

In one possible implementation, the CSI may include a reference coefficient and relative values of the remaining first coefficients and the reference coefficient. Specifically, the M first coefficients can be indicated in the following manner: one of the M first coefficients is selected as a reference coefficient, and the reference coefficient is included in the CSI, and the remaining M-1 The first coefficients are not directly included in the CSI, but the relative values between the remaining M-1 first coefficients and the reference coefficient are calculated, and the relative values of the M-1 first coefficients and the reference coefficient are calculated through the CSI instruct. In this way, when the network device learns the base coefficient and the relative values of the remaining M-1 base coefficients and the base coefficient, it can obtain all M first coefficients. The relative value can be understood as a value that can show the relative degree of different first coefficients and the reference coefficient. For example, it can be a difference, a ratio, or the result of a logarithmic operation. It should be understood that the embodiments of the present application do not limit this, and any operation or form that can express relative values should be within the protection scope of the present application.

The following uses the relative value as the difference as an example to explain the solution.

For example, M has a value of 3, including 3 first coefficients, namely first coefficient #1, first coefficient #2, first coefficient #3, first coefficient #1 has a value of 4, and first coefficient # 2 takes the value 8, the first coefficient #3 takes the value 9, and takes the value of the first coefficient #1 as the reference value, then the difference between the first coefficient #2 and the reference value is 4, and the difference between the first coefficient #3 and the reference value The difference in values is 5. In this case, the CSI includes the base value 4, and the difference values 4 and 5.

Alternatively, the network device and the terminal device can predefine reporting rules. For example, the network device and the terminal device can predefine reporting rules in order according to the size of the M first coefficients. For example, the M first coefficients are reported in order from large to small.

Optionally, when the terminal device reports the reference value and M-1 relative values to the network device, the CSI may also include the index of the port corresponding to the M-1 relative values. It should be understood that the M-1 relative values correspond to the M-1 first coefficients on a one-to-one basis, and the M-1 coefficients correspond to the M-1 ports on a one-to-one basis.

It should be understood that the corresponding relationship between the N first coefficients and the ports may also be predefined. For example, the N first coefficients correspond to the SRS port indexes from small to large in order from large to small. For example, N has a value of 3, including 3 first coefficients, namely first coefficient #1, first coefficient #2, first coefficient #3, first coefficient #1 has a value of 4, and first coefficient # 2 has a value of 8, and the first coefficient #3 has a value of 9, corresponding to port 3, port 2, and port 1 respectively.

In this implementation, all first coefficients are reported, and the value of the number O of the port through which the terminal device sends SRS is the same as N.

In another possible implementation, the terminal device reports the first coefficient according to the threshold value. The threshold can be predefined or it can be It may be preconfigured, or it may be configured, or it may be instructed by the network device to the terminal device, which is not limited in the embodiments of the present application. The terminal device reports the first coefficient according to the threshold value in the following two situations:

Case 1: The terminal device reports the first coefficient that is greater than or equal to the threshold value to the network device. Among the M first coefficients, the first coefficient that is less than the first threshold value is not reported.

Case 2: The terminal device reports to the network device an actual value of the first coefficient that is greater than or equal to the threshold value. When the first coefficient is less than the threshold value, the terminal device reports it as 0.

For example, the first threshold value is 6, the number of SRS ports is 5, and the 5 SRS ports correspond to 5 first coefficients. The value of the first coefficient #1 is 7, the value of the first coefficient #2 is 5, the value of the first coefficient #3 is 4, the value of the first coefficient #4 is 9, and the value of the first coefficient #5 is 8. , then the terminal device reports to the network device that the value of the first coefficient #1 is 7, the value of the first coefficient #2 is 0, the value of the first coefficient #3 is 0, the value of the first coefficient #4 is 9, and the value of the first coefficient #2 is 0. The value of coefficient #5 is 8, that is, the value of the first coefficient #1 included in the CSI is 7, the value of the first coefficient #2 is 0, the value of the first coefficient #3 is 0, and the value of the first coefficient #4 The value is 9 and the first coefficient #5 has a value of 8.

Or, when the value of the first coefficient is less than the first threshold value, the terminal device may report that the value corresponding to the first coefficient is empty. For example, it may report that the bit position corresponding to the first coefficient is empty. The embodiments of the present application do not limit this.

Optionally, before reporting the first coefficient to the network device, the terminal device may also determine that at least one first coefficient among the N first coefficients is not 0. In other words, before indicating the M first coefficients to the network device, the terminal device first determines whether at least one first coefficient among the N first coefficients is not 0. When at least one first coefficient among the N first coefficients is not 0, When the terminal device determines that all N first coefficients are 0, the terminal device determines not to report the first coefficients to the network device.

Optionally, the M first coefficients correspond to the O SRS ports in step 402 one-to-one.

Optionally, the terminal device may determine whether to send the SRS on the port corresponding to the first coefficient according to the value of the first coefficient. For example, when the first coefficient is less than the first threshold value, the terminal device may not send the SRS on the port corresponding to the first coefficient; when the first coefficient is greater than or equal to the first threshold value, the terminal device may send the SRS on the port corresponding to the first coefficient. SRS is sent on the port corresponding to a coefficient. The terminal device may also report to the network device the first coefficient corresponding to the port used to send the SRS.

In this implementation, the O ports used by the terminal device to send the SRS are ports corresponding to the first coefficient that is less than the first threshold value.

Or, when the N first coefficients are all 0, the terminal device can send SRS on the N SRS ports. It should be understood that these SRSs do not carry the information of the first matrix; when at least one of the N first coefficients exists When the first coefficient is not 0, SRS is sent on O SRS ports among the N SRS ports according to precoding, and these SRSs carry the information of the first matrix.

Optionally, the reporting granularity of the first coefficient corresponds to the reporting granularity of the first matrix. The reporting granularity of the first coefficient may be the size of the frequency domain bandwidth occupied when reporting each first coefficient, and the reporting granularity of the first matrix may be the size of the frequency domain bandwidth occupied when reporting each first matrix. For example, the reporting granularity of the first coefficient may be determined according to the frequency hopping bandwidth of the SRS associated with it. For example, the reporting granularity of the first coefficient is the same as the reporting granularity of the first matrix.

The method may also include: the terminal device determines whether there is profit based on the capacity criterion. If there is profit based on the above communication method (pre-whitening), then perform the above steps 401 to 403; if there is no profit through the above communication method, then the current communication method can be used. Existing communication methods carry out information transmission. The pre-whitened capacity can be expressed as: The capacity under the existing communication method can be expressed as: W=SVD(H). Among them, one possible way to determine whether there is profit: when the pre-whitening capacity is greater than the capacity under the existing communication method, it is judged that the pre-whitening capacity is profitable.

In this embodiment, the terminal device obtains the interference covariance matrix according to the channel coefficient, decomposes the interference covariance matrix to obtain the first matrix and a plurality of first coefficients, the terminal device determines the precoding according to the first matrix, and converts the first matrix The information of the matrix is carried on the SRS and sent to the network equipment. In this way, network equipment can obtain accurate interference channel information, improve the accuracy of downlink precoding of network equipment, and improve communication performance. In addition, the terminal device reports multiple first coefficients to the network device through CSI, so that the network device can accurately obtain the power information corresponding to each port.

This application proposes another embodiment, which can also improve the accuracy of network equipment in obtaining interference covariance information. As shown in Figure 6, the method may include the following steps:

Step 601: The network device sends an interference measurement reference signal to the terminal device, and correspondingly, the terminal device receives the interference measurement signal.

The terminal equipment can measure the interference measurement signal to obtain the channel coefficient. The terminal device determines the first matrix and N first coefficients based on the channel coefficients. For the first matrix and N first coefficients, reference can be made to the description in step 401, which will not be described again here. The N's The value is the same as the number of receiving antennas of the terminal device.

Step 602: The terminal device sends the CSI to the network device, and accordingly, the network device receives the CSI.

The CSI may include a first codebook. The first codebook is: a codebook with the smallest Euclidean distance to the first matrix. The Euclidean distance can be understood as the modulus of the difference between the elements in the first codebook and the elements at the same position in the first matrix. In other words, the elements in the first codebook are the elements closest to the elements of the first matrix. In other words, the first codebook is the quantized first matrix.

For example, the terminal device may determine the Euclidean distance according to the codebook and the first matrix. The codebook may be a Type I or Type II codebook, which is a two-dimensional matrix whose dimension is the number of receiving antennas of the terminal device and is independent of the number of interference measurement resource ports.

Specifically, when the number of receiving antennas of the terminal device is 2, an example of the codebook is as follows:

Among them, the number of layers can be understood as the number of data streams for spatial division multiplexing.

For the case where the terminal equipment receiving antenna is 4, the codebook can refer to the instructions in the protocol, which will not be described again here.

The way in which the terminal device determines the first matrix on the subband may refer to the description in step 402, which will not be described again here.

It should be understood that the CSI may also include N first coefficients, and the reporting of the first coefficients may refer to the description of step 403, which will not be described again here.

In this method, the terminal device determines the Euclidean distance through the codebook and the first matrix, and further selects the reported codebook (ie, the quantized first matrix) based on the Euclidean distance without binding to the port. In addition, N first coefficients are reported through CSI to represent the port power, so that the network device can accurately obtain the power information corresponding to each port. In this way, network equipment can obtain accurate interference covariance information, improve the accuracy of downlink precoding of network equipment, and improve communication performance.

It can be understood that, in order to implement the functions in the above embodiments, the network device and the terminal device include corresponding hardware structures and/or software modules that perform each function. Those skilled in the art should easily realize that the units and method steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software driving the hardware depends on the specific application scenarios and design constraints of the technical solution.

Figures 7 and 8 are schematic structural diagrams of possible communication devices provided by embodiments of the present application. These communication devices can be used to implement the functions of the terminal or base station in the above method embodiments, and therefore can also achieve the beneficial effects of the above method embodiments. In the embodiment of the present application, the communication device may be one of the terminals 120a-120j as shown in Figure 1, or it may be the base station 110a or 110b as shown in Figure 1, or it may be applied to the terminal or the base station. Modules (such as chips).

As shown in FIG. 7 , the communication device 700 includes a processing unit 710 and a transceiver unit 720 . The communication device 700 is used to implement the functions of the terminal device or network device in the method embodiment shown in FIG. 4 or FIG. 6 .

When the communication device 700 is used to implement the functions of the terminal device in the method embodiment shown in Figure 4: the transceiver unit 720 is used to receive the interference measurement signal; the transceiver unit 720 is also used to send SRS to the network device; the transceiver unit 720 is also used to Send CSI to the network device; the processing unit 710 is configured to obtain channel coefficients according to the interference measurement information; the processing unit 710 is also configured to determine the first matrix and N first coefficients according to the channel coefficients.

When the communication device 700 is used to implement the functions of the network device in the method embodiment shown in Figure 4: the transceiver unit 720 is used to send interference measurement signals; the transceiver unit 720 is also used to receive SRS; the transceiver unit 720 is also used to receive CSI.

When the communication device 700 is used to implement the functions of the terminal device in the method embodiment shown in Figure 6: the transceiver unit 720 is used to receive the interference measurement signal; the transceiver unit 720 is also used to send CSI to the network device; the processing unit 710 is used according to The interference measurement information obtains channel coefficients; the processing unit 710 is also used to determine the first matrix and N first coefficients according to the channel coefficients and the codebook.

When the communication device 700 is used to implement the functions of the network device in the method embodiment shown in Figure 6: the transceiver unit 720 is used to send interference measurement signals; the transceiver unit 720 is also used to receive CSI.

More detailed descriptions about the processing unit 710 and the transceiver unit 720 can be obtained directly by referring to the relevant descriptions in the method embodiments shown in FIG. 4 and FIG. 6 , and will not be described again here.

As shown in FIG. 8 , the communication device 800 includes a processor 810 and an interface circuit 820 . The processor 810 and the interface circuit 820 are coupled to each other. It can be understood that the interface circuit 820 may be a transceiver or an input-output interface. Optionally, the communication device 800 may also include a memory 830 for storing instructions executed by the processor 810 or input data required for the processor 810 to run the instructions or data generated after the processor 810 executes the instructions.

When the communication device 800 is used to implement the method shown in Figure 4 or Figure 6, the processor 810 is used to implement the functions of the above-mentioned processing unit 710, and the interface circuit 820 is used to implement the functions of the above-mentioned transceiver unit 720.

When the above communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above method embodiment. The terminal chip receives information from other modules in the terminal (such as radio frequency modules or antennas), and the information is sent to the terminal by the base station; or, the terminal chip sends information to other modules in the terminal (such as radio frequency modules or antennas), and the terminal chip sends information to other modules in the terminal (such as radio frequency modules or antennas). The information is sent by the terminal to the base station.

When the above communication device is a module applied to a base station, the base station module implements the functions of the base station in the above method embodiment. The base station module receives information from other modules in the base station (such as radio frequency modules or antennas), and the information is sent by the terminal to the base station; or, the base station module sends information to other modules in the base station (such as radio frequency modules or antennas), and the base station module The information is sent by the base station to the terminal. The base station module here can be the baseband chip of the base station, or it can be a DU or other module. The DU here can be a DU under the open radio access network (O-RAN) architecture.

It can be understood that the processor in the embodiment of the present application can be a central processing unit (Central Processing Unit, CPU), or other general-purpose processor, digital signal processor (Digital Signal Processor, DSP), or application specific integrated circuit. (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and the storage medium can also be present in a base station or a terminal as discrete components.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer program or instructions may be transmitted from a website, computer, A server or data center transmits via wired or wireless means to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media, such as floppy disks, hard disks, and tapes; optical media, such as digital video optical disks; or semiconductor media, such as solid-state hard drives. The computer-readable storage medium may be volatile or nonvolatile storage media, or may include both volatile and nonvolatile types of storage media.

In the various embodiments of this application, if there is no special explanation or logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referenced to each other. The technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

Optional depending on whether the description is used: In this application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the relationship between associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. In the text description of this application, The character "/" generally indicates that the related objects are in an "or"relationship; in the formula of this application, the character "/" indicates that the related objects are in a "division" relationship. "Including at least one of A, B and C" may mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

It can be understood that the various numerical numbers involved in the embodiments of the present application are only for convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the serial numbers of the above processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic.

Claims

A communication method, characterized by including:

Receive an interference measurement reference signal and obtain a channel coefficient. The channel coefficient is obtained by measuring the interference measurement reference signal. The channel coefficient is used to determine a first matrix and N first coefficients. The first matrix is used to determine Precoding corresponding to N SRS ports, N is an integer greater than or equal to 1, each column of the first matrix is constant modulus, and the N first coefficients are used to represent the power information corresponding to the N SRS ports , the N first coefficients correspond to the N SRS ports one-to-one;

Send SRS on O SRS ports among the N SRS ports according to the precoding, where O is less than or equal to N;

Channel state information CSI is sent, where the CSI is used to indicate M first coefficients among the N first coefficients, where M is less than or equal to N.
The method according to claim 1, wherein the first matrix includes N orthogonal vectors, and the N orthogonal vectors correspond to the N SRS ports one by one, and the N orthogonal vectors Each orthogonal vector in is a column in the first matrix.
The method according to claim 1 or 2, characterized in that the channel coefficient is used to determine the first matrix and N first coefficients including:

The first matrix and the N first coefficients are obtained by eigenvalue decomposition of the channel coefficients.
The method according to any one of claims 1 to 3, characterized in that receiving the interference measurement reference signal includes:

Receive the interference measurement reference signal on N receiving antennas, the channel coefficient is the interference covariance matrix R_nn corresponding to the N receiving antennas, and the dimension of R_nn is NⅹN;

The channel coefficients and the first matrix satisfy the following relationship: R_nn=UΛU^*,

Wherein, the U is a unitary matrix, the first matrix is U^*, the N first coefficients are the main diagonal elements of Λ^(-1/2), the U, U^* and The dimension of Λ is NⅹN.
The method according to any one of claims 1 to 4, characterized in that receiving the interference measurement reference signal includes:

The interference measurement reference signal is received on the interference measurement resource IMR, and the frequency domain bandwidth occupied by the IMR is the same as the scanning bandwidth corresponding to each SRS port in the N SRS ports.
The method according to any one of claims 1 to 5, characterized in that the N first coefficients correspond to a first subband, the first subband is one of K subbands, and the CSI further Used to indicate the N first coefficients corresponding to each subband in the K subbands.
The method according to claim 6, characterized in that the number of physical resource blocks RB occupied by each subband in the K subbands is determined according to the frequency hopping bandwidth of the N SRS ports, and the K is greater than An integer equal to 1.
The method according to claim 6 or 7, characterized in that the first matrix corresponds to the first sub-band.
The method according to any one of claims 1 to 8, wherein the CSI used to indicate the N first coefficients includes:

The CSI includes a reference coefficient and a relative value of a first coefficient other than the reference coefficient among the N first coefficients and the reference coefficient, wherein the reference coefficient belongs to the N first coefficients.
The method according to any one of claims 1 to 9, characterized in that,

When M is less than N, the values of the N-M first coefficients are less than the first threshold value; (the indication is empty)

When M is equal to N, the value of at least one first coefficient among the M first coefficients is less than the first threshold value, and the CSI indicates that the value of the at least one first coefficient is 0.
The method of claim 10, wherein O equals M, and the O ports correspond to the M first coefficients one-to-one.
The method according to any one of claims 1 to 7, characterized in that before sending the SRS on the N SRS ports according to the precoding, the method further comprises:

It is determined that at least one first coefficient among the N first coefficients is not 0.
A communication method, characterized by including:

sending an interference measurement reference signal, where the interference measurement reference signal is used to determine a channel coefficient, where the channel coefficient is used to determine a first matrix and N first coefficients, where the first matrix is used to determine precoding corresponding to N SRS ports, where N is an integer greater than or equal to 1, Each column of the first matrix is of constant modulus, the N first coefficients are used to represent power information corresponding to the N SRS ports, and the N first coefficients correspond one-to-one to the N SRS ports;

Receiving SRS on O SRS ports among the N SRS ports, where O is less than or equal to N;

Receive channel state information CSI, where the CSI is used to indicate M first coefficients among the N first coefficients, where M is less than or equal to N.
The method according to claim 13, characterized in that the first matrix includes N orthogonal vectors, and the N orthogonal vectors correspond to the N SRS ports one by one, and the N orthogonal vectors Each orthogonal vector in is a column in the first matrix.
The method according to claim 13 or 14, characterized in that the channel coefficient is used to determine the first matrix and N first coefficients including:

The first matrix and the N first coefficients are obtained by eigenvalue decomposition of the channel coefficients.
The method according to any one of claims 13 to 15, characterized in that sending an interference measurement reference signal comprises:

The interference measurement reference signal is sent on N transmit antennas, the channel coefficient is the interference covariance matrix Rnn corresponding to the N receive antennas, and the dimension of R_nn is NⅹN;

The channel coefficient and the first matrix satisfy the following relationship: R_nn=UΛU^*,

Wherein, the U is a unitary matrix, the first matrix is U*, the N first coefficients are main diagonal elements of Λ^(-1/2), and the U, U^* and Λ The dimensions of are NⅹN.
The method according to any one of claims 13 to 16, characterized in that sending an interference measurement reference signal includes:

The interference measurement reference signal is sent on the interference measurement resource IMR, and the frequency domain bandwidth occupied by the IMR is the same as the scanning bandwidth corresponding to each SRS port in the N SRS ports.
The method according to any one of claims 13 to 17, wherein the N first coefficients correspond to a first subband, the first subband is one of K subbands, and the CSI further Used to indicate the N first coefficients corresponding to each subband in the K subbands.
The method according to claim 18, characterized in that the number of physical resource blocks RB occupied by each subband in the K subbands is determined according to the frequency hopping bandwidth of the N SRS ports, and the K is greater than An integer equal to 1.
The method according to claim 18 or 19, characterized in that the first matrix corresponds to the first sub-band.
The method according to any one of claims 13 to 20, characterized in that the CSI is used to indicate the N first coefficients including:

The CSI includes a reference coefficient, and a relative value of a first coefficient among the N first coefficients other than the reference coefficient and the reference coefficient, and the reference coefficient belongs to the N first coefficients.
The method according to any one of claims 1 to 9, characterized in that the method further includes:

When M is less than N, the values of the N-M first coefficients are less than the first threshold value;

When M is equal to N, the value of at least one first coefficient among the M first coefficients is less than the first threshold value, and the CSI indicates that the value of the at least one first coefficient is 0.
The method of claim 22, wherein O equals M, and the O ports correspond to the M first coefficients one-to-one.
The method according to any one of claims 13 to 23, characterized in that at least one first coefficient among the N first coefficients is not 0.
A communication device, characterized by comprising a module for performing the method according to any one of claims 1 to 12.
A communication device, characterized by comprising a module for performing the method according to any one of claims 13 to 24.
A communication system, characterized by comprising the communication device according to claim 25 and claim 26.
A communication device, characterized by including:

A processor, configured to execute computer instructions stored in the memory, so that the device performs: the method according to any one of claims 1 to 24.
The device of claim 28, further comprising the memory.
The device according to claim 28 or 29, characterized in that the device further includes a communication interface, the communication interface is coupled to the processor,

The communication interface is used to input and/or output information.
The device according to any one of claims 28 to 30, characterized in that the device is a chip.