A communication method and apparatus

Abstract

A communication method and apparatus, in which a network device sends a first signal through multiple sending ports, where the first signal is determined according to a first weight matrix and a channel state information reference signal to be sent. Correspondingly, a terminal can perform channel measurement based on the channel state information reference signal and the first signals respectively received by the terminal from multiple sending ports of the network device to obtain channel state information. The first weight matrix is a unitary matrix, which is equivalent to the network device performing power equalization on multiple sending ports when sending the channel state information reference signal, so that the received signal strengths of the signals received by the terminal from different sending ports are relatively balanced, which can improve the lowest received signal strength received by the terminal, make the channel state information fed back by the terminal more accurate, and improve the downlink communication quality.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a communication method and apparatus. Background Art

[0002] In a current distributed antenna system (DAS), antennas are evenly deployed within a cell service area to improve mobile communication quality. For example, a 2- to 8-dimensional antenna array can usually be deployed, and the antenna array can be split into multiple ports.

[0003] Taking Figure 1A as an example, for an indoor DAS system, multiple ports can be deployed on different floors and areas. Therefore, different ports may be far apart. In this scenario, the multi-path signals of multiple ports received by a user equipment (UE) experience different attenuation paths, resulting in a large difference in the signal reception strengths between different ports received by the UE. During the process of measuring according to channel state information, the channel state information fed back by the UE is restricted by the channel state of the signal with the weakest signal reception strength and cannot reflect the true channel state. Summary of the Invention

[0004] Embodiments of this application provide a communication method and apparatus to improve the accuracy of channel state information fed back by a user equipment.

[0005] In a first aspect, a communication method is provided, which can be executed by a network device. The network device can be, for example, a base station in a DAS system. The network device can determine a first signal according to a first weight matrix and a channel state information reference signal to be sent. Wherein, the first weight matrix is a unitary matrix of N T ×N T , and the i-th column element in the first weight matrix corresponds to the i-th transmission port of the network device, i = 1, 2... N T , N T > 1. The network device can also send the first signal through the N T transmission ports respectively. The network device can also receive channel state information from a terminal device, and the channel state information is obtained by the terminal device through channel measurement according to the channel state information reference signal and the first signals respectively received by the terminal device from the N T transmission ports.

[0006] By using the above method, the network device can send the first signal, where the first signal is determined according to the channel state information reference signal to be sent and the first weight matrix. Correspondingly, the terminal device can, according to the channel state information reference signal and the first signals respectively received from the N TChannel measurement is performed on the first signal received by one transmission port. Among them, the first weight matrix is a unitary matrix, which is equivalent to the network device performing power equalization on N T transmission ports when transmitting the channel state information reference signal, so that the received signal strengths of the signals received by the terminal device from different transmission ports are relatively balanced, and the lowest received signal strength received by the terminal device can be improved. Therefore, compared with the prior art, the above method enables the terminal device to determine the channel state information according to the signal with a higher received signal strength, making the channel state information fed back by the terminal device more accurate, thereby improving the downlink communication quality.

[0007] Exemplarily, the first signal can be determined according to . Among them, is the first weight matrix, is the channel state information reference signal, and Rank is the rank.

[0008] In a second aspect, a communication method is provided, and this method can be executed by a terminal device. The terminal device can be, for example, a UE in a DAS system. The terminal device can respectively receive the first signals from N T transmission ports of the network device, and the first signal is determined according to the first weight matrix and the channel state information reference signal to be transmitted. Among them, the first weight matrix is an N T ×N T unitary matrix, and the i-th column element in the first weight matrix corresponds to the i-th transmission port of the network device, i = 1, 2... N T , N T > 1. The terminal device can perform channel measurement according to the channel state information reference signal and the first signals respectively received by the terminal device from N T transmission ports, obtain the channel state information, and send the channel state information to the network device.

[0009] Exemplarily, the terminal device can determine the equivalent channel matrix between the terminal device and the network device according to the channel state information reference signal and the first signals respectively received from N T transmission ports, and determine the channel state information according to the equivalent channel matrix.

[0010] Exemplarily, this equivalent channel matrix can conform to the following formula:

[0011]

[0012] Among them, is the first signal respectively received by the terminal device from N T transmission ports, is the equivalent channel matrix, and N Ris the number of receiving ports of the terminal device, and Rank is the rank. is the channel matrix between the terminal device and the network device. is the first weight matrix. is the channel state information reference signal.

[0013] Exemplarily, is known to the terminal device. For example, it can be pre-defined by the protocol or agreed upon through negotiation between the network device and the terminal device.

[0014] Exemplarily, when N T = 2, the first weight matrix can be expressed as:

[0015] Exemplarily, when N T = 4, the first weight matrix can be expressed as:

[0016] In a third aspect, a communication method is provided, and this method can be executed by a network device. The network device can be, for example, a base station in a DAS system. The network device can send the channel state information reference signal through N T transmission ports. The network device can also obtain first information, where the first information is used to determine a second weight matrix, and the second weight matrix is an N T ×N T diagonal matrix. The element in the i-th row and i-th column of the second weight matrix is determined according to the received signal strength of the channel state information reference signal received by the terminal device from the N T transmission ports respectively, and the element in the i-th row and i-th column of the second weight matrix is inversely correlated with the received signal strength of the channel state information reference signal received by the terminal device from the i-th transmission port, i = 1, 2... N T . The network device can also determine the second weight matrix according to the first information, and determine a second signal according to the second weight matrix and the channel state information reference signal, and send the second signal through N T transmission ports respectively. The network device can also be used to receive the channel state information from the terminal device.

[0017] By using the above method, the network device can send a second signal, where the second signal is determined according to the second weight matrix and the channel state information reference signal. Correspondingly, the terminal device can perform channel measurement according to the channel state information reference signal and the first signal received from the N T transmission ports respectively. Among them, the second weight matrix is related to the terminal device receiving from the N TThe signal strength of the channel state information reference signal of each transmission port is inversely correlated, so that the receiving power of the second signal received by the terminal device from each transmission port is relatively balanced. Therefore, the minimum received signal strength received by the terminal device can be improved. Therefore, compared with the prior art, the above method enables the terminal device to determine the channel state information according to the signal with a higher received signal strength, so that the channel state information fed back by the terminal device is more accurate, thereby improving the downlink communication quality.

[0018] Exemplarily, the first information can be used to indicate the second weight matrix, or the first information can be used to indicate the value of the element in the i-th row and i-th column of the second weight matrix, where i = 1, 2... N T , or the first information is used to indicate the received signal strength of the channel state information reference signals received by the terminal device from N T transmission ports respectively.

[0019] Exemplarily, the second signal can be determined according to . Wherein, is the second weight matrix, Rank is the rank, is the channel state information reference signal.

[0020] In a fourth aspect, a communication method is provided, which can be executed by a terminal device. The terminal device can be, for example, a UE in a DAS system. The terminal device can respectively receive the channel state information reference signals from N T transmission ports of a network device. The terminal device can also send first information, which is used to determine a second weight matrix. The second weight matrix is a diagonal matrix of N T ×N T . The element in the i-th row and i-th column of the second weight matrix is determined according to the received signal strength of the channel state information reference signals received by the terminal device from N T transmission ports respectively, and the element in the i-th row and i-th column of the second weight matrix is inversely correlated with the received signal strength of the channel state information reference signal received by the terminal device from the i-th transmission port, where i = 1, 2... N T . The terminal device can also respectively receive the second signals from the N T transmission ports. The second signal is determined according to the channel state information reference signal and the second weight matrix. The terminal device can also perform channel measurement according to the channel state information reference signal and the second signals received by the terminal device from N T transmission ports respectively to obtain the channel state information, and send the channel state information to the network device.

[0021] Exemplarily, the first information can be used to indicate the second weight matrix, or the first information can be used to indicate the value of the element in the i-th row and i-th column of the second weight matrix, where i = 1, 2... N T , or the first information is used to indicate the received signal strength of the channel state information reference signals respectively received by the terminal device from N T transmission ports.

[0022] Exemplarily, the terminal device can also determine an equivalent channel matrix according to the channel state information reference signal and the second signals respectively received by the terminal device from N T transmission ports, and determine the channel state information according to the equivalent channel matrix.

[0023] Exemplarily, the equivalent channel matrix can conform to the following formula:

[0024]

[0025] where, is the second signal respectively received by the terminal device from the N T transmission ports, is the equivalent channel matrix, N R is the number of receiving ports of the terminal device, Rank is the rank, is the channel matrix between the terminal device and the network device, is the second weight matrix, is the channel state information reference signal.

[0026] In a fifth aspect, an embodiment of the present application provides a communication device, which can implement the method implemented by the network device in the first aspect or any possible design thereof, or implement the method implemented by the network device in the third aspect or any possible design thereof. The device includes corresponding units or components for executing the above methods. The units included in the device can be implemented in software and / or hardware. The device can be, for example, a network device, or a chip, a chip system, a module, or a processor that can support the network device to implement the above methods.

[0027] Exemplarily, the communication device may include modular components such as a transceiver module (or communication module) and a processing module. These modules may perform the corresponding functions of the network device in the first aspect or any possible design thereof, or perform the corresponding functions of the network device in the third aspect or any possible design thereof. Among them, the transceiver unit may include a receiving module or unit for performing the receiving function, and a transmitting module or unit for performing the transmitting function. When the communication device is a network device, the transceiver unit may be a transmitting unit when performing the transmitting step, and the transceiver unit may be a receiving unit when performing the receiving step. The transceiver unit may be replaced by a transceiver, the transmitting unit may be replaced by a transmitter, and the receiving unit may be replaced by a receiver. The transceiver unit may include an antenna, a radio frequency circuit, etc. The processing unit may be a processor, such as a baseband chip, etc. When the communication device is a component with the above network device functions, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiver unit may be the input / output interface of the chip system, and the processing unit may be the processor of the chip system, such as a central processing unit (CPU).

[0028] The transceiver unit may be used to perform the receiving and / or transmitting actions performed by the network device in the first aspect or any possible design thereof, or perform the corresponding functions of the network device in the third aspect or any possible design thereof. The processing unit may be used to perform control actions other than receiving and transmitting performed by the network device in the first aspect or any possible design thereof, or perform the corresponding functions of the network device in the third aspect or any possible design thereof.

[0029] Optionally, the communication device may further include a memory for storing computer program instructions. When the processing unit or processing module calls and executes the computer program instructions, it may perform the method performed by the network device in the first aspect or any possible design thereof through the transceiver unit or transceiver module, or perform the corresponding functions of the network device in the third aspect or any possible design thereof.

[0030] In a sixth aspect, an embodiment of the present application provides a communication device that can implement the method implemented by the terminal device in the second aspect or any possible design thereof, or implement the method implemented by the terminal device in the fourth aspect or any possible design thereof. The device includes corresponding units or components for performing the above method. The units included in the device may be implemented in software and / or hardware. The device may be, for example, a terminal, or a terminal device such as a chip, a chip system, a module, or a processor that supports the terminal to implement the above method.

[0031] Exemplarily, the communication device may include modular components such as a transceiver module and a processing module, etc. These modules may perform the corresponding functions of the terminal device in the second aspect or any of its possible designs described above, or perform the corresponding functions of the network device in the fourth aspect or any of its possible designs described above. Among them, the transceiver unit may include a receiving module or unit for performing the receiving function, and a transmitting module or unit for performing the transmitting function. When the communication device is a terminal, the transceiver unit may be a transmitting unit when performing the transmitting step, and the transceiver unit may be a receiving unit when performing the receiving step. The transceiver unit may be replaced by a transceiver, the transmitting unit may be replaced by a transmitter, and the receiving unit may be replaced by a receiver. The transceiver unit may include an antenna, a radio frequency circuit, etc., and the processing unit may be a processor, such as a baseband chip, etc. When the communication device is a component with the functions of the above terminal device, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiver unit may be the input / output interface of the chip system, and the processing unit may be the processor of the chip system, such as a CPU.

[0032] The transceiver unit may be used to perform the receiving and / or transmitting actions performed by the terminal device in the second aspect or any of its possible designs described above, or perform the corresponding functions of the network device in the fourth aspect or any of its possible designs described above. The processing unit may be used to perform control actions other than receiving and transmitting performed by the terminal device in the second aspect or any of its possible designs described above, or perform the corresponding functions of the network device in the fourth aspect or any of its possible designs described above.

[0033] Optionally, the communication device may further include a memory for storing computer program instructions. When the processing unit or processing module calls and executes the computer program instructions, the method performed by the terminal device in the second aspect or any of its possible designs described above may be executed through the transceiver unit or transceiver module, or the corresponding functions of the network device in the fourth aspect or any of its possible designs described above may be executed.

[0034] In a seventh aspect, a communication system is provided. The communication system includes the communication devices shown in the fifth aspect to the sixth aspect, that is, it includes a network device for performing the method mentioned in the first aspect above and a terminal device for performing the method mentioned in the second aspect above, or includes a network device for performing the method mentioned in the third aspect above and a terminal device for performing the method mentioned in the fourth aspect above. Of course, other devices or equipment may also be included, which are not specifically limited herein.

[0035] In an eighth aspect, a computer-readable storage medium is provided. The computer-readable storage medium is used to store computer instructions or programs. When the computer instructions or programs run on a computer, the computer is caused to execute the methods described in the first aspect to the fourth aspect above or any of their possible implementation manners.

[0036] In a ninth aspect, there is provided a computer program product which, when running on a computer, causes the computer to execute the method described in the first aspect to the fourth aspect above or any of their possible designs.

[0037] In a tenth aspect, there is provided a circuit coupled to a memory, the circuit being configured to execute a program or instruction read from the memory to execute the method described in the first aspect to the fourth aspect above or any of their possible embodiments. The circuit may include a chip circuit, a chip, or a chip system, etc.

[0038] The beneficial effects of the second aspect to the tenth aspect above and their possible designs may refer to the beneficial effects in the first aspect and its possible designs, which will not be repeated here. Description of the Drawings

[0039] Figure 1A Schematic diagram of the system architecture of a DAS scenario provided by an embodiment of the present application;

[0040] Figure 1B Schematic diagram of a power balance scheme provided by an embodiment of the present application;

[0041] Figure 2 Schematic diagram of the structure of a communication device provided by an embodiment of the present application;

[0042] Figure 3 Schematic diagram of the structure of another communication device provided by an embodiment of the present application;

[0043] Figure 4 Schematic diagram of the flow of a communication method provided by an embodiment of the present application;

[0044] Figure 5 Schematic diagram of the flow of another communication method provided by an embodiment of the present application. Detailed Embodiments

[0045] In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0046] Hereinafter, some terms in the embodiments of the present application will be explained to facilitate understanding by those skilled in the art.

[0047] 1) The terminal device is, for example, a terminal equipment or a module for implementing the functions of a terminal equipment, such as a chip system, which can be disposed in the terminal equipment. The terminal equipment includes a device that provides voice and / or data connectivity to a user. Specifically, it includes a device that provides voice to the user, or a device that provides data connectivity to the user, or a device that provides both voice and data connectivity to the user. For example, it may include a handheld device with wireless connection function, or a processing device connected to a wireless modem. The terminal equipment can communicate with the core network via a radio access network (RAN), exchange voice or data with the RAN, or interact with the RAN for both voice and data. The terminal equipment may include a user equipment (UE), a wireless terminal equipment, a mobile terminal equipment, a device-to-device (D2D) terminal equipment, a V2X terminal equipment, a machine-to-machine / machine-type communications (M2M / MTC) terminal equipment, or an Internet of Things (IoT) terminal equipment. Most typically, the terminal device can be a vehicle or a terminal-type roadside unit, or a communication module or chip built into a vehicle or a roadside unit.

[0048] By way of example and not limitation, in the embodiments of the present application, the terminal equipment may also be a wearable device. A wearable device may also be referred to as a wearable intelligent device or a smart wearable device, etc. It is a general term for devices developed by applying wearable technologies to intelligentize daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is either directly worn on the body or integrated into the user's clothes or accessories. A wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable intelligent devices include those with complete functions and large sizes that can realize complete or partial functions without relying on a smart phone, such as smart watches or smart glasses, etc., and those that only focus on a certain type of application function and need to cooperate with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart helmets, and smart jewelry.

[0049] And for all the various terminal equipment introduced above, if it is located on a vehicle (such as placed inside or installed inside a vehicle), it can be considered as an in-vehicle terminal equipment, and the in-vehicle terminal equipment is also referred to as an on-board unit (OBU) for example.

[0050] In the embodiments of the present application, the terminal equipment may also include a relay. Or it can be understood that anything capable of data communication with a base station can be regarded as a terminal equipment.

[0051] In the embodiments of the present application, the terminal device supports communicating with network devices such as base stations through the air interface. Among them, the terminal device supports receiving through multiple receive (RX) ports.

[0052] In the following, the terminal is used as the execution subject of the communication method provided in the embodiments of the present application. Unless otherwise specified, the terminal device in the following can be replaced with a terminal device or a terminal equipment and other subjects.

[0053] 2) Network devices, such as including access network (AN) devices, such as base stations (e.g., access points), may refer to devices in the access network that communicate with terminals through one or more cells over the air interface. Or, for example, a network device in a V2X technology is a roadside unit (RSU). The RSU can be a fixed infrastructure entity that supports V2X applications and can exchange messages with other entities that support V2X applications. The network device may include a next generation node B (gNB) in a 5th generation (5G) new radio (NR) system (also simply referred to as the NR system), such as a base station including at least one remote radio unit (RRU) and at least one baseband unit (BBU), or may also include a centralized unit (CU) and a distributed unit (DU) in a cloud radio access network (cloud RAN) system. The embodiments of the present application do not limit this.

[0054] Since the embodiments of the present application mainly relate to access network devices, in the following, unless otherwise specified, the network devices mentioned are all access network devices. In the following, the base station can be used to represent the network device and / or the access network device.

[0055] In the embodiments of the present application, the device for implementing the functions of the network device can be the network device or a device capable of supporting the network device to implement such functions, such as a chip system. This device can be installed in the network device. In the technical solutions provided in the embodiments of the present application, taking the device for implementing the functions of the network device as the network device as an example, the technical solutions provided in the embodiments of the present application are described.

[0056] In the present application, the network device supports transmitting through multiple transmit (TX) ports. For example, multiple transmit ports are implemented through distributed antennas. For exampleFigure 1A In the DAS system shown, multiple RRUs belonging to the same network device can be transmitted through multiple transmission ports formed by multiple antennas. Among them, the multiple transmission ports can be deployed on different floors and regions to enhance the communication quality in the DAS deployment scenario.

[0057] In the following text, the network device is used as the execution subject of the communication method provided in the embodiments of this application. Unless otherwise specified, the network device in the following text can be replaced by entities such as base stations.

[0058] 3) Downlink channel measurement, or downlink channel sounding, refers to the process of sounding the downlink channel to obtain the characteristics of the downlink channel. Typical downlink channel sounding is based on the channel state information (CSI) reference signal (CSI-RS), that is, the terminal measures the CSI-RS signal sent by the network device according to the CSI resource configuration sent by the network device to obtain the downlink channel characteristics, that is, CSI, and the terminal reports the CSI to the network device 102 according to the CSI reporting configuration sent by the network device, so that the network device can perform downlink transmission more reasonably according to the CSI.

[0059] CSI includes but is not limited to the following parameters: channel quality indicator (CQI), precoding matrix indicator (PMI), and rank indicator (RI). Among them, CQI is used to indicate the coding and modulation methods recommended by the terminal. PMI is used to indicate the best precoding matrix recommended by the terminal. RI is used to indicate the best number of layers for downlink transmission recommended by the terminal.

[0060] Currently, in scenarios with distributed deployments of antennas such as DAS, since the distances between the transmission ports formed by the antennas are relatively far, the multi-path signals received by the terminal at multiple ports experience different attenuation paths, resulting in a large difference in the received signal strengths of the signals from different transmission ports. For example, in Figure 1AIn the scenario shown, when the terminal is located on Floor 1, the received signal strength of the signal from Transmission Port 1 received by the terminal is quite different from that of the signal from Transmission Port 1, and it can reach 20 decibels (dB). Since during the process of measuring based on the CSI-RS signal, the CSI fed back by the terminal is restricted by the channel state corresponding to the transmission port with the weakest received signal strength among multiple transmission ports, the large difference between the received signal strengths of different signals will lead to inaccurate CSI feedback. For example, the CSI fed back by the terminal is determined according to the channel state between the transmission port with the weakest received signal strength and the UE. In this CSI, the number of layers indicated by the RI is small, the codebook indicated by the PMI is not optimal, and the coding and modulation mode indicated by the CQI is not optimal. Downlink communication based on this CSI will cause a reduction in downlink communication quality.

[0061] As Figure 1B shown, for the problem of low CSI feedback accuracy caused by the imbalance of the signal strengths received by the UE from different transmission ports in scenarios with multiple transmission ports such as DAS, the embodiments of the present application provide a communication method, which realizes the power balance of the UE receiving multiple ports by controlling the transmission power of multiple transmission ports, thereby improving the accuracy of CSI feedback. This communication method can be executed by the terminal and / or network device in the DAS scenario, where the terminal and / or network device may include Figure 2 and / or Figure 3 the structure shown.

[0062] Exemplarily, Figure 2 shows a schematic structural diagram of a possible communication device, which may include a processing module (or processing unit) 210 and a transceiver module (or transceiver unit) 220. Exemplarily, Figure 2 the structure shown may be a terminal device or a network device, or a functional component having the functions of the terminal device or network device shown in the present application. When this structure is a terminal device or a network device, the transceiver module 220 may be a transceiver, and the transceiver may include an antenna and a radio frequency circuit, etc. The processing module 210 may be a processor, such as a baseband processor, and one or more central processing units (central processing unit, CPU) may be included in the baseband processor. When this structure is a functional component having the functions of the terminal or network device shown in the present application, the transceiver module 220 may be a radio frequency unit, and the processing module 210 may be a processor, such as a baseband processor. When this structure is a chip system, the transceiver module 220 may be the input / output interface of the chip (such as a baseband chip), and the processing module 210 may be the processor of the chip system, which may include one or more central processing units. It should be understood that the processing module 210 in the embodiments of the present application may be implemented by a processor or processor-related circuit components, and the transceiver module 220 may be implemented by a transceiver or transceiver-related circuit components.

[0063] For example, the processing module 210 may be used to perform all operations other than the transceiver operations performed by the terminal and / or network device in any embodiment of the present application, such as processing operations, and / or to support other processes in the embodiments described herein, such as generating messages, information, and / or signaling sent by the transceiver module 220, and processing the messages, information, and / or signaling received by the transceiver module 220. The transceiver module 220 may be used to perform all receiving and sending operations performed by the terminal and / or network device in any embodiment of the present application, and / or to support other processes in the embodiments described herein, such as sending and / or receiving data.

[0064] In addition, the transceiver module 220 may be a functional module that can complete both sending and receiving operations. For example, the transceiver module 220 may be used to perform all sending and receiving operations performed by the terminal and / or network device hereinafter. For example, when performing a sending operation, the transceiver module 220 may be regarded as a sending module, and when performing a receiving operation, the transceiver module 220 may be regarded as a receiving module; alternatively, the transceiver module 220 may also be two functional modules. The transceiver module 220 may be regarded as a collective term for these two functional modules, which are a sending module and a receiving module respectively. The sending module is used to complete the sending operation. For example, the sending module may be used to perform all sending operations performed by the terminal and / or network device hereinafter, where the receiving module is used to complete the receiving operation, and the receiving module may be used to perform all receiving operations performed by the terminal and / or network device.

[0065] Figure 3 The structural schematic diagram of another communication device is shown, which is used to perform the actions performed by the terminal and / or network device provided in the embodiments of the present application. For ease of understanding and illustration. As Figure 3 shown, the communication device may include at least one component of a processor, a memory, a radio frequency circuit, an antenna, or an input / output device. The processor is mainly used to process communication protocols and communication data, control the terminal and / or network device, execute software programs, process data of software programs, etc. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for the conversion between baseband signals and radio frequency signals and the processing of radio frequency signals. The antenna is mainly used to receive and send radio frequency signals in the form of electromagnetic waves. The input / output device, such as a touch screen, a display screen, a keyboard, or an interface, etc., is mainly used to receive data input by the user and output data to the user. It should be noted that some types of terminals and / or network devices may not have an input / output device.

[0066] When data needs to be sent, after the processor performs baseband processing on the data to be sent, it outputs a baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to this communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes this data. For ease of explanation, Figure 3 only one memory and one processor are shown. In actual terminal and / or network device products, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be set independently of the processor or integrated with the processor. The embodiments of the present application do not limit this.

[0067] It should be understood that if Figure 3 the device shown may be a network device, and this device may include at least one RRU and one BBU. The RRU is mainly used for the transceiver of radio frequency signals and the conversion between radio frequency signals and baseband signals, such as for sending indication information to the terminal. The BBU part is mainly used for performing baseband processing and controlling the base station, etc. The RRU and the BBU may be physically set together, such as sharing the same processor and / or memory of this communication device; the RRU and the BBU may also be physically separated, that is, a distributed base station, such as using different processors and memories of the communication device respectively.

[0068] In the embodiments of the present application, the antenna and the radio frequency circuit with transceiver functions can be regarded as a transceiver unit (the transceiver unit can be a functional unit that can implement both the sending function and the receiving function; or, the transceiver unit may also include two functional units, namely a receiving unit that can implement the receiving function and a sending unit that can implement the sending function), and the processor with processing functions can be regarded as a processing unit. As Figure 3 shown, this communication device may include a transceiver unit 310 and a processing unit 320. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, etc. The processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, etc. Optionally, the devices in the transceiver unit 310 used to implement the receiving function can be regarded as the receiving unit, and the devices in the transceiver unit 310 used to implement the sending function can be regarded as the sending unit, that is, the transceiver unit 310 may include a receiving unit and a sending unit. The transceiver unit is sometimes also referred to as a transceiver, a transceiver, or a transceiver circuit, etc. The receiving unit is sometimes also referred to as a receiver, a receiver, or a receiving circuit, etc. The sending unit is sometimes also referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0069] It should be understood that the transceiver unit 310 may correspond to the transceiver module 220, or rather, the transceiver module 220 may be implemented by the transceiver unit 310. The transceiver unit 310 is used to perform the sending operation and receiving operation of the terminal and / or network device in the embodiments shown below, and / or to support other processes of the technologies described herein. The processing unit 320 may correspond to the processing module 210, or rather, the processing module 210 may be implemented by the processing unit 320. The processing unit 320 is used to perform other operations of the terminal and / or network device except for the transceiver operation in the embodiments shown below, for example, to perform all operations other than receiving and sending performed by the terminal and / or network device in the embodiments shown below, and / or to support other processes of the technologies described herein.

[0070] As Figure 4 shown, a communication method provided by an embodiment of the present application can be applied to Figure 1A and Figure 1B the system frameworks shown, and the network devices and terminals involved in the method may have Figure 2 or Figure 3 the structures shown. The method may include the following steps:

[0071] S101: The network device determines a first signal according to a first weight matrix and the CSI-RS to be sent.

[0072] This first weight matrix may be referred to as the CSI-RS outer layer weight, that is, a power equalization matrix of N T transmission ports designed to optimize the CSI feedback accuracy. Exemplarily, the first weight matrix may be an N T ×N T unitary matrix. The i-th column element in the first weight matrix may correspond to the i-th transmission port of the network device, that is, the first weight matrix is used to adjust the transmission power of the i-th transmission port of the network device, where i = 1, 2... N T , N T > 1.

[0073] That is to say, the first signal determined by the network device according to the first weight matrix can make the received signal strengths of the signals sent by the network device through different transmission ports with the first transmission power be relatively close when received by the terminal, realizing power equalization of multiple transmission ports. For example, the intensity difference between the received signal strengths of the signals of different transmission ports received by the terminal does not exceed a first threshold, and the first threshold may be a constant, such as 5 dB.

[0074] Exemplarily, the first weight matrix may be predefined by the protocol and may be pre-stored in the network device and / or the terminal.

[0075] In a possible implementation manner, the first signal may be determined according to Determine, or rather, the first signal can satisfy wherein, is the first weight matrix, is the CSI-RS to be sent, and Rank is the rank. It can also be predefined by the protocol and pre-stored in the network device and / or the terminal.

[0076] S102: The network device sends the first signal through N T transmission ports respectively. Correspondingly, the terminal receives the first signals from the N T transmission ports of the network device respectively.

[0077] S103: The terminal performs channel measurement according to the CSI-RS and the first signals received by the terminal from the N T transmission ports of the network device respectively, and obtains the CSI.

[0078] wherein, the CSI may include at least one of RI, PMI, and CQI.

[0079] S104: The terminal sends the CSI to the network device. Correspondingly, the network device receives the CSI from the terminal.

[0080] Using the above method, the network device can send the first signal, wherein the first signal is determined according to the CSI-RS and the first weight matrix. Correspondingly, the terminal can perform channel measurement according to the CSI-RS and the first signals received from the N T transmission ports of the network device respectively, and obtain the channel state information. Among them, the first weight matrix is a unitary matrix, which is equivalent to the network device performing power equalization on the N T transmission ports when sending the CSI-RS, so that the received signal strengths of the signals from different transmission ports of the network device received by the terminal in the DAS system are relatively balanced, and the lowest received signal strength received by the terminal can be improved. Therefore, compared with the prior art, the above method enables the terminal to determine the CSI according to the signal with a higher received signal strength, making the CSI fed back by the terminal more accurate, thereby improving the downlink communication quality.

[0081] In the above S103, the terminal can determine the equivalent channel matrix between the terminal and the network device according to the CSI-RS and the first signals received by the terminal from the N T transmission ports respectively to implement channel measurement, so as to implement determining the CSI according to the equivalent channel matrix. The equivalent channel matrix is obtained according to the channel matrix between the terminal and the network device and the first weight matrix. Among them, the channel matrix between the terminal and the network device can be considered as the channel matrix measured by the terminal when the network device sends the CSI-RS to the terminal.

[0082] Optionally, for the CSI-RS, the first signals respectively received by the terminal from N transmission ports of the network device, and the equivalent channel matrix between the terminal and the network device may satisfy the following formula 1: T wherein, the first signals respectively received by the terminal from N transmission ports of the network device,

[0083]

[0084] wherein, is the first signal respectively received by the terminal from N transmission ports of the network device, T is the equivalent channel matrix, N is the number of receiving ports of the terminal, Rank is the rank, R is the channel matrix between the terminal and the network device, is the first weight matrix, is the channel state information reference signal. Wherein, may be unknown to the terminal, because the terminal only needs to obtain according to formula 1 and determine the CSI according to

[0085] It should be understood that each column of corresponds to a transmission port of the network device. Since the first weight matrix is a unitary matrix of N T ×N T the power of different ports of the network device corresponding to the equivalent matrix is relatively balanced. That is to say, the equivalent matrix is equivalent to the channel matrix between the terminal and the network device according to the first weight matrix after power equalization adjustment to obtain the equivalent channel matrix. Wherein, when the positions of the network device and the terminal remain unchanged,

[0086] is fixed.

[0087] Formula 1 is the CSI-RS measurement model. When obtaining the CSI, it is equivalent that the terminal takes as the equivalent channel matrix between the terminal and the network device, and obtains the CSI according to The main improvement of this application lies in that when performing CSI measurement, the network device sends the first signal, and the terminal constructs the CSI-RS measurement model shown in the above formula 1, rather than how to determine the CSI according to the CSI measurement model. Therefore, the method for determining the CSI according to the CSI-RS measurement model will not be elaborated here, and the specific implementation method can refer to the method for determining the CSI in the relevant standards of the 3rd Generation Partnership Project (3GPP).

[0088] ​​The following are some examples of possible first weight matrices, but it should not be understood that the first weight matrix in this application is limited to those exemplified below.

[0089] For example, when the number of transmission ports of the network device is 2, i.e., N T = 2, the first weight matrix can be That is to say, in Formula 1

[0090] For another example, when the number of transmission ports of the network device is 4, i.e., N T = 4, the first weight matrix can be That is to say, in Formula 1

[0091] As Figure 5 shown, another communication method provided by an embodiment of this application can be applied to Figure 1A and Figure 1B the system frameworks shown. The network device and the terminal involved in the method may have the Figure 2 or Figure 3 structures shown. The method may include the following steps:

[0092] S201: The network device sends CSI-RS through N T transmission ports. Correspondingly, the terminal respectively receives CSI-RS from N T transmission ports of the network device.

[0093] Exemplarily, assuming that the CSI-RS is Rank is the rank, and the CSI-RS received by the terminal from N T transmission ports is expressed as N R is the number of receiving ports of the terminal, then the received signal strength of the CSI-RS received by the terminal from N T transmission ports of the network device can be determined according to . Among them, and can satisfy the following Formula 2:

[0094]

[0095] Among them, is the channel matrix between the terminal and the network device.

[0096] S202: The terminal sends the first information to the network device, and the first information is used to determine the second weight matrix. Correspondingly, the network device obtains the first information and obtains the second weight matrix.

[0097] Among them, the second weight matrix is NT ×N T is a diagonal matrix. The element in the i-th row and i-th column of the second weight matrix is determined according to the received signal strength of the CSI-RS from the N T transmission ports of the network device by the terminal, and the element in the i-th row and i-th column of the second weight matrix is inversely correlated with the received signal strength of the CSI-RS from the i-th transmission port of the network device received by the terminal, where i = 1, 2... N T . Among them, the received signal strength is, for example, the reference signal receiving power (RSRP).

[0098] That is to say, the greater the received signal strength of the CSI-RS from the i-th transmission port of the network device received by the terminal, the smaller the value of the element in the i-th row and i-th column of the second weight matrix. Conversely, the smaller the received signal strength of the CSI-RS from the i-th transmission port of the network device received by the terminal, the greater the value of the element in the i-th row and i-th column of the second weight matrix. For example, the intensity difference between the product of the received signal strength of the signal from the k-th transmission port received by the terminal and the element in the k-th row and k-th column, and the product of the received signal strength of the signal from the l-th transmission port received by the terminal and the element in the l-th row and l-th column does not exceed the second threshold. The second threshold can be a constant and the value is small, such as 5 dB, 1 ≤ k, l ≤ N T .

[0099] The above first information can be used to indicate the second weight matrix. For example, after the terminal determines the second weight matrix, it indicates the second weight matrix to the network device. For example, the first information can indicate the index of the second weight matrix in the weight matrix set (or list). Or, the first information is used to respectively indicate the values of the elements in the i-th row and i-th column of the second weight matrix, i = 1, 2... N T .

[0100] In addition, the first information can also indicate the received signal strength of the CSI-RS from the i-th transmission port of the network device received by the terminal, i = 1, 2... N T . At this time, the network device can determine the second weight matrix according to the received signal strength of the CSI-RS from the i-th transmission port of the network device received by the terminal. Optionally, the network device can also indicate the second weight matrix to the terminal.

[0101] Optionally, the above S202 can also be replaced by other implementation methods. For example, the received signal strength of the CSI-RS from the N T transmission ports of the network device received by the terminal is obtained manually, and the second weight matrix is determined and input into the network device.

[0102] S203: The network device determines a second weight matrix according to the first information, and determines a second signal according to the second weight matrix and the CSI-RS to be transmitted.

[0103] Similar to the first weight matrix, this second weight matrix can be referred to as the CSI-RS outer layer weight, that is, a power equalization matrix for N T transmission ports designed to optimize the CSI feedback accuracy. Different from the first weight matrix, the second weight matrix can be dynamically set according to the reception strength of the signals received by the terminal from different transmission ports of the network device, and the implementation method is more flexible.

[0104] That is to say, determining the second signal according to the second weight matrix can make the reception signal strengths of the signals transmitted by different transmission ports of the network device through the second transmission power received by the terminal relatively close, further realizing the power equalization of multiple transmission ports of the network device.

[0105] Optionally, the second signal can be determined according to or, in other words, the second signal can be expressed as where is the second weight matrix, Rank is the rank, is the CSI-RS to be transmitted.

[0106] S204: The network device transmits the second signal through N T transmission ports. Correspondingly, the terminal respectively receives the second signals sent from N T transmission ports of the network device.

[0107] S205: The terminal performs channel measurement according to the CSI-RS and the second signals respectively received from N T transmission ports of the network device to obtain CSI.

[0108] Among them, CSI may include at least one of RI, PMI, and CQI.

[0109] S206: The terminal sends CSI to the network device. Correspondingly, the network device receives CSI from the terminal.

[0110] Using the above method, the network device can send the second signal, where the second signal is determined according to the second weight matrix and the CSI-RS to be transmitted. Correspondingly, the terminal can perform channel measurement on the second signals respectively received from N T transmission ports of the network device to obtain channel state information. Among them, the second weight matrix is based on the terminal respectively receiving N TThe receiving strength of the CSI-RS of each transmitting port is dynamically determined, which can make the receiving signal strength of the signals received by the terminal from different transmitting ports more balanced, and can improve the minimum receiving signal strength received by the terminal. Therefore, compared with the prior art, the above method enables the terminal to determine the CSI based on the signal with higher receiving signal strength, so that the CSI fed back by the terminal is more accurate, thereby improving the downlink communication quality.

[0111] In the above S205, the terminal can obtain the N T The equivalent channel matrix between the terminal and the network device is determined by the second signal received by each transmitting port, and then the channel measurement is performed to obtain the CSI determined according to the equivalent channel matrix. In other words, the equivalent channel matrix is ​​equivalent to the channel matrix between the terminal and the network device and the second weight matrix. Among them, the channel matrix between the terminal and the network device can be considered as the channel matrix measured by the terminal device when the network device sends the CSI-RS to the terminal device.

[0112] Optionally, CSI-RS, the terminal from the network device N T The equivalent channel matrix between the second signal received by the sending ports and the terminal and the network device can satisfy the following formula 3:

[0113]

[0114] in, N is the terminal from the network device T The second signal received by the sending ports is is the equivalent channel matrix between the network device and the terminal, N R is the number of receiving ports of the terminal, Rank is the rank, is the channel matrix, is the second weight matrix, is CSI-RS. It can be unknown to the terminal, because the terminal only needs to obtain according to formula 3 And according to Just determine the CSI.

[0115] It should be understood that Each column of corresponds to a transmission port of the network device. Since the second weight matrix is ​​based on the N transmitted by the network device received by the terminal, T The received signal strength of the second signal respectively sent by the transmitting ports is determined, so that the power of different ports of the network device corresponding to the equivalent matrix is ​​relatively balanced. In other words, the equivalent matrix is ​​equivalent to the channel matrix between the terminal and the network device according to the second weight matrix. The equivalent channel matrix obtained after power equalization adjustment. Among them, when the positions of the network device and the terminal remain unchanged, Fixed.

[0116] Formula 3 is the CSI-RS measurement model. When obtaining CSI, it is equivalent to the terminal taking as the equivalent channel matrix between the terminal and the network device, and obtaining CSI according to The main improvement of this application lies in that when performing CSI measurement, the network device sends a second signal, and the terminal constructs the CSI-RS measurement model shown in Formula 3 above, rather than how to determine CSI according to the CSI measurement model. Therefore, the method of determining CSI according to the CSI-RS measurement model will not be elaborated here, and the specific implementation method can refer to the method of determining CSI in the relevant standards of 3GPP.

[0117] The following gives some examples of possible second weight matrices, but it should not be understood that the second weight matrix in this application is limited to the examples given below.

[0118] For example, when the number of transmission ports of the network device is 2, that is, N T = 2, the second weight matrix can be That is to say, in Formula 3 Among them, the values of a and b can be determined according to the received signal strength RSRP1 of the CSI-RS of the first transmission port of the terminal receiving the network device and the received signal strength RSRP2 of the CSI-RS of the second transmission port of the terminal receiving the network device. Among them, the larger the RSRP of the CSI-RS received by the terminal for a certain transmission port, the smaller the value of the element corresponding to this transmission port in the second weight matrix. For example, a * RSRP1 = b * RSRP2. Another example is 0dB ≤ |a * RSRP1 - b * RSRP2| ≤ 5dB.

[0119] For another example, when the number of transmission ports of the network device is 4, that is, N T = 4, the first weight matrix can be That is to say, in Formula 1 Among them, the values of a, b, c, and d can be determined according to the received signal strengths of the CSI-RS sent from the first to the fourth transmission ports of the terminal receiving the network device. Specifically, refer to N T = 2, the determination method of a and b, and the repeated parts will not be elaborated.

[0120] Based on the same technical concept, the embodiment of this application also provides a communication device for implementing the functions realized by the above network device and terminal. The device may include Figure 2 and / or Figure 3 The structure shown. This communication system can be used to implementFigure 4 and / or Figure 5 Steps performed by a network device and a terminal in the communication method shown.

[0121] An embodiment of the present application provides a communication system. The communication system may include the network device and the terminal involved in the above embodiment. Optionally, the communication system may include Figure 1A The architecture shown. The communication system can be used to implement Figure 4 and / or Figure 5 Steps in the communication method shown.

[0122] An embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium is used to store a computer program. When the computer program is executed by a computer, the computer can implement the processes related to the network device and / or the terminal provided in the above method embodiment.

[0123] An embodiment of the present application further provides a computer program product. The computer program product is used to store a computer program. When the computer program is executed by a computer, the computer can implement the processes related to the network device and / or the terminal provided in the above method embodiment.

[0124] An embodiment of the present application further provides a chip or a chip system (or circuit). The chip may include a processor, and the processor may be used to call a program or an instruction in a memory to execute the processes related to the network device and / or the terminal provided in the above method embodiment. The chip system may include components such as the chip, the memory, or the transceiver.

[0125] It can be understood that the processor in the embodiment of the present application may be a CPU, or may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0126] The method steps in the embodiments of the present application can be implemented in a hardware manner or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a 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, removable hard disk, CD-ROM, or any other form of storage medium well-known in the art. An exemplary storage medium is coupled to the processor, enabling the processor to read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a network device and / or a terminal. Of course, the processor and the storage medium can also exist as discrete components in a network device or a terminal device.

[0127] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable devices. The computer program or instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrating one or more available media. The available medium can be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive.

[0128] In various embodiments of the present application, if there is no special description and 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 can be combined to form new embodiments according to their inherent logical relationships.

[0129] In this application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the relationship between associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. In the textual description of this application, the character " / " generally indicates an "or" relationship between the associated objects before and after; in the formulas of this application, the character " / " indicates a "division" relationship between the associated objects before and after.

[0130] It can be understood that the various numerical numbers involved in the embodiments of this application are only for the convenience of description and are not used to limit the scope of the embodiments of this application. The magnitudes of the serial numbers of the above processes do not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic.

Claims

1. A communication method, characterized in that, including: The network device sends channel state information reference signals through N T transmission ports respectively; The network device obtains first information, where the first information is used to determine a second weight matrix, and the second weight matrix is an N T ×N T diagonal matrix. The element in the i-th row and i-th column of the second weight matrix is determined according to the received signal strengths of the channel state information reference signals respectively received by the terminal device from the N T transmission ports, and the element in the i-th row and i-th column of the second weight matrix is inversely correlated with the received signal strength of the channel state information reference signal respectively received by the terminal device from the i-th transmission port, where i = 1, 2,..., N T ; The network device determines the second weight matrix according to the first information, and determines a second signal according to the second weight matrix and the channel state information reference signal; The network device sends the second signal through the N T transmission ports respectively; The network device receives channel state information from the terminal device, and the channel state information is obtained by the terminal device through channel measurement based on the channel state information reference signal and second signals respectively received by the terminal device from the N T transmission ports.

2. The method according to claim 1, characterized in that, The first information is used to indicate the second weight matrix, or the first information is used to indicate the element in the i-th row and i-th column of the second weight matrix, or the first information is used to indicate the received signal strength of the channel state information reference signals respectively received by the terminal device from the N T transmission ports.

3. The method according to claim 1 or 2, characterized in that, The second signal is determined according to W NT×NT X NT×Rank and is determined; Among them, W NT×NT is the second weight matrix, Rank is the rank, and X NT×Rank is the channel state information reference signal.

4. A communication method, characterized in that, including: The terminal device respectively receives the channel state information reference signals from N T transmission ports of the network device; The terminal device sends first information to the network device, where the first information is used to determine a second weight matrix, and the second weight matrix is an N T ×N T diagonal matrix. The element in the i-th row and i-th column of the second weight matrix is determined according to the received signal strength of the channel state information reference signal from the N T transmission ports received by the terminal device respectively, and the element in the i-th row and i-th column of the second weight matrix is inversely correlated with the received signal strength of the channel state information reference signal from the i-th transmission port received by the terminal device respectively, where i = 1, 2... N T ; The terminal device receives a second signal from the N T transmission ports, where the second signal is determined by the network device according to the second weight matrix and the channel state information reference signal; The terminal device performs channel measurement according to the channel state information reference signal and second signals respectively received by the terminal device from the N T transmission ports to obtain channel state information; The terminal device sends the channel state information to the network device.

5. The method according to claim 4, wherein The first information is used to indicate the second weight matrix, or the first information is used to indicate the element in the i-th row and i-th column of the second weight matrix, or the first information is used to indicate the received signal strength of the channel state information reference signals respectively received by the terminal device from the N T receiving signal strengths of the sending ports.

6. The method according to claim 4 or 5, characterized in that, The terminal device performs channel measurement according to the channel state information reference signal and first signals respectively received by the terminal device from the N T transmission ports to obtain channel state information, including: The terminal device determines an equivalent channel matrix between the terminal device and the network device according to the channel state information reference signal and second signals respectively received by the terminal device from the N T transmission ports; The terminal device determines the channel state information according to the equivalent channel matrix.

7. The method according to claim 6, wherein The equivalent channel matrix conforms to the following formula: wherein, is the second signal received by the terminal device from the N T transmission ports respectively, is the equivalent channel matrix, N R is the number of receiving ports of the terminal device, Rank is the rank, is the channel matrix between the terminal device and the network device, is the second weight matrix, is the channel state information reference signal.

8. A network device, characterized in that, including a processing module and a transceiver module: The transceiver module is used for communication between the network device and the terminal device; The processing module is used to execute, through the transceiver module: Send channel state information reference signals through N T transmission ports respectively; Obtain first information, where the first information is used to determine a second weight matrix, and the second weight matrix is an N T ×N T diagonal matrix. The element in the i-th row and i-th column of the second weight matrix is determined according to the received signal strength of the channel state information reference signal received by the terminal device from the N T transmission ports respectively, and the element in the i-th row and i-th column of the second weight matrix is inversely correlated with the received signal strength of the channel state information reference signal received by the terminal device from the i-th transmission port respectively, where i = 1, 2... N T ; Determine a second signal according to the second weight matrix and the channel state information reference signal; Send the second signal through the N T transmission ports respectively; Receive channel state information from the terminal device, where the channel state information is obtained by the terminal device through channel measurement based on the channel state information reference signal and second signals respectively received by the terminal device from the N T transmission ports.

9. The network device according to claim 8, characterized in that The first information is used to indicate the second weight matrix, or the first information is used to indicate the element in the i-th row and i-th column of the second weight matrix, or the first information is used to indicate the received signal strength of the channel state information reference signals respectively received by the terminal device from the N T transmission ports.

10. The network device according to claim 8 or 9, characterized in that, The second signal is determined according to determination; Among them, is the second weight matrix, and Rank is the rank, is the channel state information reference signal.

11. A terminal device, characterized in that, including a processing module and a transceiver module: The transceiver module is used for communication between the terminal device and the network device; The processing module is used to execute, through the transceiver module: Receive channel state information reference signals from N T transmission ports of the network device respectively; Send the first information to the network device, where the first information is used to determine a second weight matrix, and the second weight matrix is an N T ×N T diagonal matrix. The element in the i-th row and i-th column of the second weight matrix is determined according to the received signal strength of the channel state information reference signal from the N T transmission ports received by the terminal device respectively, and the element in the i-th row and i-th column of the second weight matrix is inversely correlated with the received signal strength of the channel state information reference signal from the i-th transmission port received by the terminal device respectively, where i = 1, 2... N T ; Receive a second signal from the N T transmission ports, where the second signal is determined by the network device according to the second weight matrix and the channel state information reference signal; Performing channel measurement according to the channel state information reference signal and a second signal respectively received by the terminal device from the N T transmission ports to obtain channel state information; Send the channel state information to the network device.

12. The terminal device according to claim 11, wherein, The first information is used to indicate the second weight matrix, or the first information is used to indicate the element in the i-th row and i-th column of the second weight matrix, or the first information is used to indicate the received signal strength of the channel state information reference signals respectively received by the terminal device from the N T receiving signal strengths of the transmitting ports.

13. The terminal device according to claim 11 or 12, characterized in that, Specifically, the processing module is used for: Determine an equivalent channel matrix between the terminal device and the network device according to the channel state information reference signal and second signals respectively received by the terminal device from the N T transmission ports; Determine the channel state information according to the equivalent channel matrix.

14. The terminal device according to claim 13, characterized in that, The equivalent channel matrix conforms to the following formula: wherein, is the second signal received by the terminal device from the N T transmission ports respectively, is the equivalent channel matrix, N R is the number of receiving ports of the terminal device, Rank is the rank, is the channel matrix between the terminal device and the network device, is the second weight matrix, is the channel state information reference signal.

15. A communication system, characterized in that, including the network device according to any one of claims 8-10, and the terminal device according to any one of claims 11-14.

16. A computer-readable storage medium, characterized in that, A computer program is stored, and when the computer program runs on a computer, the computer is caused to execute the method according to any one of claims 1-7.

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