CN115118555A - A communication method and device - Google Patents

Abstract

A network device sends a first signal through a plurality of sending ports, wherein the first signal is determined according to a first weight matrix and a channel state information reference signal to be sent. Accordingly, the terminal may perform channel measurement according to the channel state information reference signal and the first signals respectively received by the terminal from the plurality of transmission ports of the network device, to obtain the channel state information. The first weight matrix is a unitary matrix, which is equivalent to power equalization performed on a plurality of sending ports by the network device when sending the channel state information reference signal, so that the received signal strength of signals from different sending ports received by the terminal is relatively equalized, the lowest received signal strength received by the terminal can be improved, the channel state information fed back by the terminal is more accurate, and the downlink communication quality is improved.

Description

A communication method and device

technical field

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

Background technique

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

Taking FIG. 1A as an example, for an indoor DAS system, multiple ports may be deployed on different floors and areas, and therefore, different ports may be far apart. In this scenario, the multi-channel signals of multiple ports received by a user equipment (user equipment, UE) experience different attenuation paths, resulting in a large difference in received signal strength between different ports received by the UE. In the process of measuring according to the channel state information, the channel state information fed back by the UE is limited by the channel state of the signal with the weakest signal reception strength, and cannot reflect the real channel state.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a communication method and apparatus, so as to improve the accuracy of channel state information fed back by user equipment.

In a first aspect, a communication method is provided, and the method can be performed by a network device. The network device may be, for example, a base station in a DAS system. The network device may determine the first signal according to the first weight matrix and the channel state information reference signal to be sent. Wherein, the first weight matrix is an N _T × _NT unitary matrix, and the i-th column element in the first weight matrix corresponds to the i-th sending port of the network device, i=1, 2... N _T , N _T >1. The network device may also send the first signal through the _NT sending ports respectively. The network device may also receive channel state information from the terminal device, where the channel state information is obtained by the terminal device performing channel measurement according to the channel state information reference signal and the first signal respectively introduced by the terminal device from the _NT transmission ports.

Using the above method, the network device can send the first signal, wherein the first signal is determined according to the channel state information reference signal to be sent and the first weight matrix. Correspondingly, the channel measurement can be performed by the terminal device according to the channel state information reference signal and the first signals respectively received from the _NT transmission ports. The first weight matrix is a unitary matrix, which is equivalent to that the network equipment performs power equalization on the _NT transmission ports when transmitting the channel state information reference signal, so that the terminal device receives the received signals from signals from different transmission ports. The strength is relatively balanced, and the lowest received signal strength received by the terminal device can be increased. Therefore, compared with the prior art, the above method enables the terminal device to determine the channel state information according to the signal with higher received signal strength, so that the channel state information fed back by the terminal device is more accurate, thereby improving downlink communication quality.

确定。其中，

为所述第一权值矩阵，

为所述信道状态信息参考信号，Rank为秩。Exemplarily, the first signal may be based on

Sure. in,

is the first weight matrix,

is the channel state information reference signal, and Rank is the rank.

In a second aspect, a communication method is provided, the method being executable by a terminal device. The terminal device may be, for example, a UE in a DAS system. The terminal device may respectively receive the first signals from the _NT sending ports of the network device, where the first signals are determined according to the first weight matrix and the channel state information reference signal to be sent. Wherein, the first weight matrix is an N _T × _NT unitary matrix, and the i-th column element in the first weight matrix corresponds to the i-th sending port of the network device, i=1, 2... N _T , N _T >1. The terminal device may perform channel measurement according to the channel state information reference signal and the first signals respectively received by the terminal device from the _NT transmission ports, obtain channel state information, and send the channel state information to the network device.

Exemplarily, the terminal device may 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 the _NT transmission ports, and determine the equivalent channel matrix according to the equivalent channel matrix. the channel state information.

Exemplarily, the equivalent channel matrix may conform to the following formula:

为终端装置从N_T个发送端口分别接收的第一信号，

为等效信道矩阵，N_R为终端装置的接收端口的数量，Rank为秩，

为终端装置与网络设备之间的信道矩阵，

为第一权值矩阵，

为信道状态信息参考信号。in,

is the first signal respectively received by the terminal device from the _NT sending ports,

is the equivalent channel matrix, _NR 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 equipment,

is the first weight matrix,

is the channel state information reference signal.

对于终端装置来说是已知的。比如，可以是协议预定义的或网络设备和终端装置之间通过协商达成一致的。Exemplary,

It is known for terminal devices. For example, it may be a predefined protocol or an agreement between the network device and the terminal device through negotiation.

Exemplarily, when N _T =2, the first weight matrix can be expressed as:

Exemplarily, when N _T =4, the first weight matrix can be expressed as:

In a third aspect, a communication method is provided, and the method can be performed by a network device. The network device may be, for example, a base station in a DAS system. The network device may transmit the channel state information reference signal through the _NT transmission ports. The network device may also obtain first information, where the first information is used to determine a second weight matrix, the second weight matrix is an N _T × N _T diagonal matrix, and the i-th row and i-column elements in the second weight matrix It is determined according to the received signal strengths of the channel state information reference signals respectively received by the terminal device from the _NT transmission ports, and the i-th row and i-column elements in the second weight matrix are respectively received by the terminal device from the i-th transmission port. The received signal strengths of the channel state information reference signals of the ports are inversely correlated, i=1, 2...N _T . The network device may also determine a 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 transmit the second signal through the _NT sending ports respectively. The network equipment is also operable to receive channel state information from the terminal device.

Using the above method, the second signal can be sent by the network device, wherein the second signal is determined according to the second weight matrix and the channel state information reference signal. Correspondingly, the channel measurement can be performed by the terminal device according to the channel state information reference signal and the first signals respectively received from the _NT transmission ports. The second weight matrix is inversely correlated with the signal strengths at which the terminal device receives the channel state information reference signals from the _NT transmission ports, so that the reception 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 increased. Therefore, compared with the prior art, the above method enables the terminal device to determine the channel state information according to the signal with 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.

Exemplarily, the first information may be used to indicate the second weight matrix, or the first information may be used to indicate the value of the element in the ith row and the ith column in the second weight matrix, i=1, 2... N _T , or the first information is used to indicate the received signal strengths of the channel state information reference signals respectively received by the terminal device from the N _T transmission ports.

确定。其中，

为第二权值矩阵，Rank为秩，

为信道状态信息参考信号。Exemplarily, the second signal may be based on

Sure. in,

is the second weight matrix, Rank is the rank,

is the channel state information reference signal.

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

Exemplarily, the first information may be used to indicate the second weight matrix, or the first information may be used to indicate the value of the element in the ith row and the ith column in the second weight matrix, i=1, 2 ... N _T , or the first information is used to indicate the received signal strengths of the channel state information reference signals from the N _T transmission ports respectively received by the terminal device.

Exemplarily, the terminal device may further determine the equivalent channel matrix according to the channel state information reference signal and the second signals from the _NT transmission ports respectively received by the terminal device, and determine the channel state information according to the equivalent channel matrix.

Exemplarily, the equivalent channel matrix may conform to the following formula:

为终端装置从所述N_T个发送端口分别接收的第二信号，

为等效信道矩阵，N_R为终端装置的接收端口的数量，Rank为秩，

为终端装置与网络设备之间的信道矩阵，

为第二权值矩阵，

为所述信道状态信息参考信号。in,

is the second signal respectively received by the terminal device from the _NT transmission ports,

is the equivalent channel matrix, _NR 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 equipment,

is the second weight matrix,

is the channel state information reference signal.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, which can implement the method implemented by a 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. A method implemented by a network device. The apparatus comprises corresponding units or components for carrying out the above-described method. The units included in the apparatus may be implemented by software and/or hardware. The apparatus may 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 method.

Exemplarily, the communication apparatus may include modular components such as a transceiver module (or a communication module) and a processing module, and these modules may perform the corresponding functions of the network device in the first aspect or any possible design thereof, or perform the above-mentioned functions. A corresponding function of the network device in the third aspect or any possible design thereof. Wherein, the transceiver unit may include a receiving module or a receiving unit for performing a receiving function, and a sending module or a sending unit for performing a sending function. When the communication device is a network device, the transceiver unit may be a sending unit when performing the sending step, and the transceiver unit may be a receiving unit when performing the receiving step, and the transceiver unit may be replaced by a transceiver, the sending unit may be replaced by a transmitter, and the receiving unit may be replaced by a transceiver. Units can be replaced by receivers. The transceiver unit may include an antenna, a radio frequency circuit, and the like, and the processing unit may be a processor, such as a baseband chip. When the communication device is a component having the above-mentioned network equipment function, 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 an input/output interface of the chip system, and the processing unit may be a processor of the chip system, such as a central processing unit (central processing unit, CPU).

The transceiver unit may be configured to perform the receiving and/or sending actions performed by the network device in the first aspect or any possible design thereof, or perform 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 reception and transmission performed by the network device in the first aspect or any possible design thereof, or perform corresponding functions of the network device in the third aspect or any possible design thereof.

Optionally, the communication device may further include a memory for storing computer program instructions. When the processing unit or the processing module invokes the computer program instructions and executes them, the first aspect or any possible possibility thereof may be performed by the transceiver unit or the transceiver module. The method performed by the network device in the design, or perform the corresponding function of the network device in the third aspect or any possible design thereof.

In a sixth aspect, an embodiment of the present application provides a communication device, which can implement the method implemented by the terminal device in the second aspect or any possible design thereof, or implement the fourth aspect or any possible design in the above-mentioned A method implemented by a terminal device. The apparatus comprises corresponding units or components for carrying out the above-described method. The units included in the apparatus may be implemented by 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 can support the terminal to implement the above method.

Exemplarily, the communication device may include modular components such as a transceiver module and a processing module, and these modules may perform the corresponding functions of the terminal device in the above second aspect or any possible design thereof, or perform the above fourth aspect or its functions. The corresponding functionality of the network device in any possible design. Wherein, the transceiver unit may include a receiving module or a receiving unit for performing a receiving function, and a sending module or a sending unit for performing a sending function. When the communication device is a terminal, the transceiving unit may be a transmitting unit when performing the sending step, and the transceiving unit may be a receiving unit when performing the receiving step, and the transceiving unit may be replaced by a transceiver, the transmitting unit may be replaced by a transmitter, and the receiving unit Can be replaced by the receiver. The transceiver unit may include an antenna, a radio frequency circuit, and the like, and the processing unit may be a processor, such as a baseband chip. When the communication device is a component having 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 system-on-chip, the transceiver unit may be an input/output interface of the system-on-chip, and the processing unit may be a processor of the system-on-chip, such as a CPU.

The transceiver unit may be configured to perform the receiving and/or sending actions performed by the terminal device in the second aspect or any possible design thereof, or perform corresponding functions of the network device in the fourth aspect or any possible design thereof. The processing unit may be used to perform control actions other than reception and transmission performed by the terminal device in the second aspect or any possible design thereof, or perform corresponding functions of the network device in the fourth aspect or any possible design thereof.

Optionally, the communication device may further include a memory for storing computer program instructions. When the processing unit or the processing module invokes the computer program instructions and executes them, the second aspect or any possible possibility thereof may be performed by the transceiver unit or the transceiver module. The method performed by the terminal device in the design, or the corresponding function of the network device in the fourth aspect or any possible design thereof is performed.

In a seventh aspect, a communication system is provided, the communication system includes the communication apparatus shown in the fifth aspect to the sixth aspect, that is to say, includes a network device for executing the method mentioned in the above first aspect and a network device for executing the above A terminal device for the method mentioned in the second aspect, or a network device for performing the method mentioned in the third aspect and a terminal device for performing the method mentioned in the fourth aspect. Of course, other devices or devices may also be included, which are not specifically limited in this application.

In an eighth aspect, a computer-readable storage medium is provided, the computer-readable storage medium is used to store computer instructions or programs, and when the computer instructions or programs are run on a computer, the computer is made to execute the above-mentioned first to fourth aspects. A method as described in an aspect or any of its possible embodiments.

In a ninth aspect, there is provided a computer program product which, when run on a computer, causes the computer to perform the methods described in the above-mentioned first to fourth aspects or any possible designs thereof.

A tenth aspect provides a circuit, which is coupled to a memory, and used to execute a program or an instruction in the read memory, so as to execute the above-mentioned first to fourth aspects or any one of possible implementations thereof the method described. The circuit may include a chip circuit, a chip or a chip system, or the like.

For the beneficial effects of the second aspect to the tenth aspect and possible designs thereof, reference may be made to the beneficial effects of the first aspect and its possible designs, which will not be repeated here.

Description of drawings

1A is a schematic diagram of a system architecture of a DAS scenario provided by an embodiment of the present application;

FIG. 1B is a schematic diagram of a power balancing solution provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 4 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of another communication method provided by an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application will be explained, so as to facilitate the understanding of those skilled in the art.

1) A terminal device, such as a terminal device, or a module for realizing the functions of the terminal device, such as a chip system, and the chip system can be set in the terminal device. Terminal devices include devices that provide users with voice and/or data connectivity, specifically, devices that provide users with voice, or devices that provide users with data connectivity, or devices that provide users with voice and data connectivity . For example, it may include a handheld device with wireless connectivity, 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 exchange voice and data with the RAN. The terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device (D2D) terminal equipment, V2X terminal equipment, machine-to-machine/machine-type communication ( machine-to-machine/machine-type communications, M2M/MTC) terminal equipment, Internet of things (internet of things, IoT) terminal equipment. Most typically, the terminal device may be a vehicle or terminal-type roadside unit, or a communication module or chip built into the vehicle or roadside unit.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. Wait. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

The various terminal devices described above, if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as on-board terminal equipment. .

In this embodiment of the present application, the terminal device may further include a relay (relay). Alternatively, it can be understood that any device capable of data communication with the base station can be regarded as a terminal device.

In this embodiment of the present application, the terminal device supports communication with network equipment such as a base station through an air interface. The terminal device supports receiving through multiple receive (receive, RX) ports.

Hereinafter, a terminal is used as the execution body of the communication method provided by the embodiments of the present application. Unless otherwise specified, the terminal device in the following may be replaced by a body such as a terminal device or a terminal device.

2) Network equipment, including, for example, access network (AN) equipment, such as a base station (for example, an access point), may refer to a device in the access network that communicates with a terminal through one or more cells over the air interface, or For example, a network device in a V2X technology is a road side unit (RSU). The RSU can be a fixed infrastructure entity supporting V2X applications and can exchange messages with other entities supporting V2X applications. The network device may include the next generation node B (gNB) in the fifth generation mobile communication technology (the 5th generation, 5G) new radio (new radio, NR) system (also referred to as the NR system for short), such as including A base station of at least one remote radio unit (remote radio unit, RRU) and at least one baseband unit (baseband unit, BBU), or may also include a centralized unit ( A centralized unit (CU) and a distributed unit (distributed unit, DU) are not limited in this embodiment of the present application.

Because the embodiments of the present application mainly relate to access network devices, in the following, unless otherwise specified, the network devices described refer to access network devices. In the following, network equipment and/or access network equipment may be represented by base stations.

In this embodiment of the present application, the apparatus for implementing the function of the network device may be the network device, or may be an apparatus capable of supporting the network device to implement the function, such as a chip system, and the apparatus may be installed in the network device. In the technical solutions provided by the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described by taking the device for realizing the function of the network device being a network device as an example.

In this application, a network device supports transmission through multiple transmit (transmit, TX) ports, for example, multiple transmit ports are implemented through distributed antennas. For example, in the DAS system shown in FIG. 1A, multiple transmission ports belonging to the same network device Each RRU can transmit through multiple transmit ports formed by multiple antennas, wherein the multiple transmit ports can be deployed on different floors and areas to enhance the communication quality in the DAS deployment scenario.

Hereinafter, a network device is used as an execution subject of the communication method provided by the embodiments of the present application. Unless otherwise specified, the network device in the following may be replaced by a subject such as a base station.

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

CSI includes but is not limited to the following parameters: channel quality indicator (CQI), precoding matrix indicator (PMI) and rank indicator (RI). The CQI is used to indicate the coding and modulation mode suggested by the terminal. PMI is used to indicate the best precoding matrix suggested by the terminal. RI is used to indicate the optimal number of layers for downlink transmission proposed by the terminal.

At present, in DAS and other distributed deployment scenarios using antennas, due to the long distance between the transmitting ports formed by the antennas, the multi-channel signals of multiple ports received by the terminal experience different attenuation paths, resulting in different transmission ports. There is a large difference between the received signal strength of the signal. For example, in the scenario shown in FIG. 1A , when the terminal is located on floor 1, the received signal strength of the signal from the sending port 1 received by the terminal is quite different from the received signal strength of the signal from the sending port 1, which can achieve 20 decibels (dB). In the process of measuring according to the CSI-RS signal, the CSI fed back by the terminal is limited by the channel state corresponding to the transmitting port with the weakest received signal strength among the multiple transmitting ports, and the received signal strength of different signals varies greatly. It will lead to inaccurate CSI feedback. For example, the CSI fed back by the terminal is determined according to the channel state between the sending port with the weakest received signal strength and the UE. In the CSI, the number of layers indicated by RI is small, the codebook indicated by PMI is not optimal, and the CQI The indicated coding and modulation methods are not optimal, and downlink communication based on the CSI will reduce the quality of downlink communication.

As shown in FIG. 1B , in order to solve the problem that the accuracy of CSI feedback is not high due to the unbalanced signal strength of different transmission ports received by the UE in a scenario with multiple transmission ports such as DAS, an embodiment of the present application provides a communication method, which is The transmit power of the transmit port is controlled to achieve the UE receive multi-port power balance, thereby improving the accuracy of CSI feedback. The communication method may be performed by a terminal and/or a network device in a DAS scenario, wherein the terminal and/or the network device may include the structures shown in FIG. 2 and/or FIG. 3 .

Exemplarily, FIG. 2 shows a schematic structural diagram of a possible communication apparatus, and the structure may include a processing module (or a processing unit) 210 and a transceiver module (or a transceiver unit) 220 . Exemplarily, the structure shown in FIG. 2 may be a terminal device or a network device, or have functional components of the terminal device or network device shown in this application. When the structure is a terminal device or a network device, the transceiver module 220 may be a transceiver, the transceiver may include an antenna and a radio frequency circuit, etc., and the processing module 210 may be a processor, such as a baseband processor, and the baseband processor may include one or more Multiple central processing units (CPUs). When the structure is a functional component having a terminal or a network device shown in this 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 the structure is a chip system, the transceiver module 220 may be an input/output interface of a chip (eg, a baseband chip), and the processing module 210 may be a processor of the chip system, which may include one or more central processing units. It should be understood that the processing module 210 in this embodiment of the present application may be implemented by a processor or a circuit component related to the processor, and the transceiver module 220 may be implemented by a transceiver or a circuit component related to the transceiver.

For example, the processing module 210 may be configured to perform all operations performed by the terminal and/or network device in any embodiment of the present application except for the transceiving operations, such as processing operations, and/or to support the implementation described herein Examples of other processes, such as generating messages, information and/or signaling sent by the transceiver module 220, and processing 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 used to support other processes in the embodiments described herein, such as data send and/or receive.

In addition, the transceiver module 220 can be a functional module, which can perform both sending and receiving operations. For example, the transceiver module 220 can be used to perform all the sending operations and receiving performed by the terminal and/or the network device below. For example, when performing a sending operation, the transceiver module 220 can be considered as a sending module, and when performing a receiving operation, the transceiver module 220 can be considered as a receiving module; alternatively, the transceiver module 220 can also be two functional modules, the transceiver module 220 can be regarded as the general name of these two functional modules, these two functional modules are respectively a sending module and a receiving module, the sending module is used to complete the sending operation, for example, the sending module can be used to perform the following operations performed by the terminal and/or the network device. All sending operations performed, wherein 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 the network device.

FIG. 3 shows a schematic structural diagram of another communication apparatus, which is configured to perform the actions performed by the terminal and/or the network device provided in the embodiments of the present application. Easy to understand and easy to illustrate. As shown in FIG. 3, the communication device may include at least one 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 terminals and/or network devices, execute software programs, and process data of software programs. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal. Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves. An input and output device, such as a touch screen, a display screen, a keyboard or an interface, is mainly used for receiving data input by a user and outputting data to the user. It should be noted that some types of terminals and/or network devices may not have input and output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal through the antenna in the form of electromagnetic waves. When data is sent to the 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, which converts the baseband signal into data and processes the data . For ease of illustration, only one memory and processor are shown in FIG. 3 . In an actual terminal and/or network device product, 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 or the like. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in this embodiment of the present application.

It should be understood that if the apparatus shown in FIG. 3 may be a network device, the apparatus may include at least one RRU and BBU. The RRU is mainly used to send and receive radio frequency signals and convert radio frequency signals to baseband signals, for example, to send indication information to terminals. The BBU part is mainly used to perform baseband processing and control the base station. The RRU and the BBU may be physically set together, such as sharing the same processor and/or memory of the communication device; the RRU and the BBU may also be physically separated and set up, that is, distributed base stations, such as those using the communication device respectively. Different processors and memories.

In the embodiments of the present application, the antenna and the radio frequency circuit with a transceiver function may be regarded as a transceiver unit (the transceiver unit may be a functional unit that can implement a sending function and a receiving function; alternatively, the transceiver unit may also include two The functional units are respectively a receiving unit capable of realizing a receiving function and a transmitting unit capable of realizing a sending function), and a processor with a processing function is regarded as a processing unit. As shown in FIG. 3 , the communication device may include a transceiver unit 310 and a processing unit 320 . The transceiving unit may also be referred to as a transceiver, a transceiver, a transceiving device, or the like. The processing unit may also be referred to as a processor, a processing single board, a processing module, a processing device, and the like. Optionally, the device used for implementing the receiving function in the transceiver unit 310 may be regarded as a receiving unit, and the device used for implementing the transmitting function in the transceiver unit 310 may be regarded as a transmitting unit, that is, the transceiver unit 310 may include a receiving unit and a transmitting unit. . The transceiver unit may also sometimes be referred to as a transceiver, a transceiver, or a transceiver circuit. The receiving unit may also sometimes be referred to as a receiver, receiver, or receiving circuit, or the like. The transmitting unit may also sometimes be referred to as a transmitter, a transmitter, or a transmitting circuit, or the like.

It should be understood that the transceiver unit 310 may correspond to the transceiver module 220 , or the transceiver module 220 may be implemented by the transceiver unit 310 . Transceiver unit 310 is used to perform sending and/or receiving operations of the terminal and/or network device in the embodiments shown below, and/or other processes used to support the techniques described herein. The processing unit 320 may correspond to the processing module 210 , or in other words, the processing module 210 may be implemented by the processing unit 320 . The processing unit 320 is configured to perform other operations of the terminal and/or the network device in the embodiment shown below except for the transceiving operation, for example, to perform the operations performed by the terminal and/or the network device in the embodiment shown below. All operations other than receiving and transmitting, and/or other processes used to support the techniques described herein.

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

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

The first weight matrix may be referred to as CSI-RS outer weight, that is, a power equalization matrix of _NT transmit ports designed to optimize CSI feedback accuracy. Exemplarily, the first weight matrix may be an N _T × _NT unitary matrix, and the i-th column element in the first weight matrix may correspond to the i-th sending port of the network device, that is, the first weight matrix uses For adjusting the transmit power of the i-th transmit port of the network device, where i=1, 2... _NT , _NT >1.

That is to say, the first signal determined by the network device according to the first weight matrix can enable the terminal to receive signals sent by the network device through different transmission ports with the first transmission power and the received signal strengths are relatively close, thereby realizing multiple transmission ports. power balance. For example, the strength difference between the received signal strengths of the signals of different sending ports received by the terminal does not exceed a first threshold, and the first threshold may be a constant, such as 5dB.

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

确定，或者说，第一信号可满足

其中，

为该第一权值矩阵，

为待发送的CSI-RS，Rank为秩。

也可由协议预定义并预先存储在网络设备和/或终端中。In a possible implementation, the first signal may be based on

It is determined, or in other words, that the first signal can satisfy

in,

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.

S102: The network device sends the first signal through the _NT sending ports respectively. Correspondingly, the terminal respectively receives the first signals sent from the _NT sending ports of the network device.

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

The CSI may include at least one of RI, PMI and CQI.

S104: The terminal sends the CSI to the network device. Accordingly, the network device receives the CSI from the terminal.

Using the above method, the network device can send the first signal, where the first signal is determined according to the CSI-RS and the first weight matrix. Correspondingly, the terminal can obtain channel state information by performing channel measurement according to the CSI-RS and the first signals respectively received from the _NT transmission ports of the network device. Wherein, the first weight matrix is a unitary matrix, which is equivalent to that the network equipment performs power equalization on the _NT transmission ports when transmitting CSI-RS, so that the terminal in the DAS system receives the data from different transmission ports of the network equipment. The received signal strength of the signal is relatively balanced, which can improve the lowest received signal strength received by the terminal. Therefore, compared with the prior art, the above method enables the terminal to determine CSI according to a signal with a higher received signal strength, so that the CSI fed back by the terminal is more accurate, thereby improving downlink communication quality.

In the above S103, the terminal may determine the equivalent channel matrix between the terminal and the network device according to the CSI-RS and the first signals respectively received by the terminal from the _NT transmission ports of the network device to implement channel measurement, so as to realize channel measurement according to the equivalent channel matrix Determine CSI. The equivalent channel matrix is equivalently obtained according to the channel matrix between the terminal and the network device and the first weight matrix. The channel matrix between the terminal and the network device may be considered as the channel matrix obtained by the terminal measurement when the network device sends the CSI-RS to the terminal.

Optionally, the CSI-RS, the first signal respectively received by the terminal from the _NT transmission ports of the network device, and the equivalent channel matrix between the terminal and the network device may satisfy the following formula 1:

为终端从网络设备的N_T个发送端口分别接收的第一信号，

为该等效信道矩阵，N_R为终端的接收端口的数量，Rank为秩，

为终端与网络设备之间的信道矩阵，

为第一权值矩阵，

为信道状态信息参考信号。其中，

对于终端来说可以是未知的，因为终端只需要根据公式1获取

并根据

确定CSI即可。in,

is the first signal respectively received by the terminal from the _NT sending ports of the network device,

is the equivalent channel matrix, _NR is the number of receiving ports of the terminal, Rank is the rank,

is the channel matrix between the terminal and the network device,

is the first weight matrix,

is the channel state information reference signal. in,

It can be unknown to the terminal, because the terminal only needs to obtain according to formula 1

and according to

Just determine the CSI.

的每一列对应网络设备的一个发送端口，由于第一权值矩阵为N_T×N_T的酉矩阵，因此使得该等效矩阵对应的网络设备的不同端口的功率较为均衡，也就是说，等效矩阵相当于是根据第一权值矩阵对终端与网络设备之间的信道矩阵

进行功率均衡调整后获得的等效信道矩阵。其中，在网络设备与终端的位置不变的情况下，It should be understood that

Each column of , corresponds to a transmitting port of a 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, etc. The effective matrix is equivalent to the channel matrix between the terminal and the network device according to the first weight matrix

Equivalent channel matrix obtained after power equalization adjustment. Among them, in the case where the positions of the network device and the terminal remain unchanged,

固定。

fixed.

作为终端与网络设备之间的等效信道矩阵，并根据

获得CSI。其中，本申请的主要改进在于在进行CSI测量时，由网络设备发送第一信号，以及在终端构建以上公式1所示的CSI-RS测量模型，而不在于如何根据CSI测量模型确定CSI。因此这里对于根据CSI-RS测量模型确定CSI的方式不再赘述，具体实现方式可参照第三代移动通信合作伙伴计划(3GPP)的相关标准中确定CSI的方式。Formula 1 is the CSI-RS measurement model. When obtaining CSI, it is equivalent to that the terminal will

as the equivalent channel matrix between the terminal and the network equipment, and according to

Get CSI. Wherein, the main improvement of the present application lies in that when CSI measurement is performed, the first signal is sent by the network device, and the CSI-RS measurement model shown in Equation 1 above is constructed at the terminal, 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 repeated here, and the specific implementation method may refer to the method of determining CSI in the relevant standards of the 3rd Generation Partnership Project (3GPP).

Some possible first weight matrices are exemplified below, but it should not be understood that the first weight matrices in this application are limited to those exemplified below.

就是说，公式1中的

For example, when the number of sending ports of the network device is 2, that is, when N _T =2, the first weight matrix may be

That is, in Equation 1,

就是说，公式1中的

For another example, when the number of sending ports of the network device is 4, that is, when N _T =4, the first weight matrix may be

That is, in Equation 1,

As shown in FIG. 5 , another communication method provided by this embodiment of the present application can be applied to the system framework shown in FIG. 1A and FIG. 1B , and the network devices and terminals involved in the method may have the functions of FIG. 3 shows the structure. The method may include the following steps:

S201: The network device sends the CSI-RS through _NT sending ports. Correspondingly, the terminal receives the CSI-RS from the _NT transmission ports of the network device respectively.

Rank为秩，终端分别从N_T个发送端口接收的CSI-RS表示为

N_R为终端的接收端口的数量，则终端分别从网络设备的N_T个发送端口接收的CSI-RS的接收信号强度可根据

确定。其中，

与

可满足下述公式2：Exemplarily, it is assumed that the CSI-RS is

Rank is the rank, and the CSI-RS received by the terminal from the _NT transmission ports are expressed as

_NR is the number of receiving ports of the terminal, then the received signal strength of the CSI-RS received by the terminal from the _NT transmitting ports of the network device can be determined according to

Sure. in,

and

The following formula 2 can be satisfied:

为终端与网络设备之间的信道矩阵。in,

is the channel matrix between the terminal and the network device.

S202: The terminal sends first information to the network device, where 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.

The second weight matrix is an N _T × _NT diagonal matrix, and the i-th row and i-column elements in the second weight matrix are based on the CSI-RS received by the terminal from the N _T transmission ports of the network device. The received signal strength is determined, and the i-th row and i-column elements in the second weight matrix are inversely correlated with the received signal strength of the CSI-RS from the i-th transmission port of the network device respectively received by the terminal, where i=1 , 2...N _T . The received signal strength is, for example, reference signal receiving power (RSRP).

That is, the greater the received signal strength of the CSI-RS received by the terminal from the i-th transmission port of the network device, the smaller the value of the i-th row and the i-th column element in the second weight matrix. Conversely, the smaller the received signal strength of the CSI-RS received by the terminal from the i-th transmission port of the network device, the larger the value of the i-th row and the i-th column element in the second weight matrix. For example, the product of the received signal strength of the signal of the kth transmission port received by the terminal and the element of the kth row and the kth column is the product of the received signal strength of the signal of the lth transmission port received by the terminal and the element of the lth row and the lth column. The intensity difference between the products of , does not exceed a second threshold, and the second threshold may be a constant and a small value, such as 5dB, 1≤k, _l≤NT .

The above first information may be used to indicate the second weight matrix. For example, after the terminal determines the second weight matrix, the terminal indicates the second weight matrix to the network device. For example, the first information may indicate an index of the second weight matrix in the set (or list) of weight matrices. Alternatively, the first information is used to respectively indicate the values of the elements in the i-th row and the i-th column in the second weight matrix, i=1, 2...N _T .

In addition, the first information may also indicate the received signal strength of the CSI-RS received by the terminal from the i-th transmission port of the network device, 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 received by the terminal from the i-th transmission port of the network device. Optionally, the network device can also indicate the second weight matrix to the terminal. value matrix.

Optionally, the above S202 can also be replaced with other implementation manners, for example, manually acquiring the received signal strengths of the CSI-RSs from the _NT transmission ports of the network device respectively received by the terminal, and determining the second weight matrix, and input the second weight matrix to the network device.

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 sent.

Similar to the first weight matrix, the second weight matrix may be called a CSI-RS outer layer weight, that is, a power equalization matrix of _NT transmit ports designed to optimize CSI feedback accuracy. Different from the first weight matrix, the second weight matrix can be dynamically set according to the reception strength of the terminal receiving signals of different transmission ports of the network device, and the implementation is more flexible.

That is to say, determining the second signal according to the second weight matrix enables the terminal to receive signals sent by different transmission ports of the network device through the second transmission power with relatively close received signal strengths, and further realizes multi-transmission ports of the network device. Power balance.

确定，或者说，第二信号可表示为

其中，

为第二权值矩阵，Rank为秩，

为待发送的CSI-RS。Optionally, the second signal can be based on

determine, or in other words, the second signal can be expressed as

in,

is the second weight matrix, Rank is the rank,

is the CSI-RS to be sent.

S204: The network device sends the second signal through the _NT sending ports. Correspondingly, the terminal respectively receives the second signals sent from the _NT sending ports of the network device.

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

The CSI may include at least one of RI, PMI and CQI.

S206: The terminal sends the CSI to the network device. Accordingly, the network device receives the CSI from the terminal.

Using the above method, the network device can send the second signal, wherein the second signal is determined according to the second weight matrix and the CSI-RS to be sent _. Channel measurement is performed on the second signal to obtain channel state information. The second weight matrix is dynamically determined according to the receiving strengths of the CSI-RSs that the terminal receives from the _NT sending ports respectively, which can make the received signal strengths of the signals received by the terminal from different sending ports more balanced, and can improve the The lowest received signal strength received by the terminal. Therefore, compared with the prior art, the above method enables the terminal to determine CSI according to a signal with a higher received signal strength, so that the CSI fed back by the terminal is more accurate, thereby improving downlink communication quality.

In the above S205, the terminal may determine the equivalent channel matrix between the terminal and the network device according to the CSI-RS and the second signals respectively received by the terminal from the _NT transmission ports of the network device, and then perform channel measurement, and obtain the equivalent channel matrix according to the CSI determined by the channel matrix. That is to say, the equivalent channel matrix is equivalently obtained according to the channel matrix between the terminal and the network device and the second weight matrix. Wherein, the channel matrix between the terminal and the network device may be regarded as the channel matrix obtained by the measurement of the terminal device when the network device sends the CSI-RS to the terminal device.

Optionally, the CSI-RS, the second signal respectively received by the terminal from the _NT transmission ports of the network device, and the equivalent channel matrix between the terminal and the network device may satisfy the following formula 3:

为终端从网络设备的N_T个发送端口分别接收的第二信号，

为网络设备与终端之间的等效信道矩阵，N_R为终端的接收端口的数量，Rank为秩，

为信道矩阵，

为第二权值矩阵，

为CSI-RS。其中，

对于终端来说可以是未知的，因为终端只需要根据公式3获取

并根据

确定CSI即可。in,

is the second signal respectively received by the terminal from the _NT sending ports of the network device,

is the equivalent channel matrix between the network device and the terminal, _NR 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. in,

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.

的每一列对应网络设备的一个发送端口，由于第二权值矩阵根据终端接收的由网络设备的N_T个发送端口分别发送的第二信号的接收信号强度确定的，因此使得该等效矩阵对应的网络设备的不同端口的功率较为均衡，也就是说，等效矩阵相当于根据第二权值矩阵对终端与网络设备之间的信道矩阵

进行功率均衡调整后获得的等效信道矩阵。其中，在网络设备与终端的位置不变的情况下，

固定。It should be understood that

Each column corresponds to a transmission port of the network device. Since the second weight matrix is determined according to the received signal strength of the second signal received by the terminal and sent by the _NT transmission ports of the network device, the equivalent matrix corresponds to The power of the different ports of the network device 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 second weight matrix

Equivalent channel matrix obtained after power equalization adjustment. Among them, in the case where the positions of the network device and the terminal remain unchanged,

fixed.

作为终端与网络设备之间的等效信道矩阵，并根据

获得CSI。其中，本申请的主要改进在于在进行CSI测量时，由网络设备发送第二信号，以及在终端构建以上公式3所示的CSI-RS测量模型，而不在于如何根据CSI测量模型确定CSI。因此这里对于根据CSI-RS测量模型确定CSI的方式不再赘述，具体实现方式可参照3GPP的相关标准中确定CSI的方式。Equation 3 is the CSI-RS measurement model. When obtaining CSI, it is equivalent to that the terminal will

as the equivalent channel matrix between the terminal and the network equipment, and according to

Get CSI. Wherein, the main improvement of the present application lies in that when CSI measurement is performed, the second signal is sent by the network device, and the CSI-RS measurement model shown in Equation 3 above is constructed at the terminal, rather than how to determine CSI according to the CSI measurement model. Therefore, the method for determining CSI according to the CSI-RS measurement model will not be repeated here, and the specific implementation method may refer to the method for determining CSI in the relevant standards of 3GPP.

Some possible second weight matrices are exemplified below, but it should not be understood that the second weight matrix in this application is limited to the following examples.

就是说，公式3中的

其中，a和b的取值可根据终端接收网络设备的第1个发送端口的CSI-RS的接收信号强度RSRP1和接收网络设备的第2个发送端口的CSI-RS的接收信号强度RSRP2确定，其中，终端接收某个发送端口的CSI-RS的RSRP越大，则第二权值矩阵中该发送端口对应的元素的取值越小。例如，a*RSRP1＝b*RSRP2。又例如，0dB≤|a*RSRP1-b*RSRP2|≤5dB。For example, when the number of sending ports of the network device is 2, that is, when N _T =2, the second weight matrix can be

That is, in Equation 3,

Wherein, the values of a and b can be determined according to the received signal strength RSRP1 of the CSI-RS of the first transmitting port of the terminal receiving the network device and the received signal strength RSRP2 of the CSI-RS of the second transmitting port of the receiving network device, Wherein, the larger the RSRP of the CSI-RS of a certain transmission port received by the terminal, the smaller the value of the element corresponding to the transmission port in the second weight matrix. For example, a*RSRP1=b*RSRP2. For another example, 0dB≤|a*RSRP1-b*RSRP2|≤5dB.

就是说，公式1中的

其中，a、b、c和d的取值可根据终端接收网络设备的第1个发送端口至第4个发送端口发出的CSI-RS的接收信号强度确定，具体可参照N_T＝2时，a和b的确定方式，重复之处不再赘述。For another example, when the number of sending ports of the network device is 4, that is, when N _T =4, the first weight matrix may be

That is, in Equation 1,

Wherein, the values of a, b, c and d can be determined according to the received signal strength of the CSI-RS sent by the terminal receiving the first transmission port to the fourth transmission port of the network device _. The determination methods of a and b will not be repeated for repeated points.

Based on the same technical concept, an embodiment of the present application further provides a communication apparatus for implementing the above functions implemented by the network device and the terminal. The device may include the structure shown in FIG. 2 and/or FIG. 3 . The communication system can be used to implement the steps performed by the network device and the terminal in the communication method shown in FIG. 4 and/or FIG. 5 .

Embodiments of the present application provide a communication system. The communication system may include the network devices and terminals involved in the foregoing embodiments. Optionally, the communication system may include the architecture shown in FIG. 1A . The communication system may be used to implement the steps in the communication method shown in FIG. 4 and/or FIG. 5 .

Embodiments of the present application further provide a computer-readable storage medium, where the computer-readable storage medium is used to store a computer program, and when the computer program is executed by a computer, the computer can implement the network devices and/or terminals provided in the foregoing method embodiments. process.

Embodiments of the present application further provide a computer program product, where 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 terminal provided by the above method embodiments.

Embodiments of the present application further provide a chip or a chip system (or circuit), where the chip may include a processor, and the processor may be configured to call a program or an instruction in a memory to execute the connection between the network device and/or the network device and/or the method provided by the foregoing method embodiments. Terminal related processes. The chip system may include components such as the chip, memory or transceiver.

It can be understood that the processor in the embodiments of the present application may be a CPU, and may also be other general-purpose processors, digital signal processors (digital signal processors, DSPs), application specific integrated circuits (ASICs), field A field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor may be a microprocessor or any conventional processor.

The method steps in the embodiments of the present application may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions. Software instructions may be composed of corresponding software modules, and software modules may 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 memory, registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage medium may reside in an ASIC. Additionally, the ASIC may be located in the network device and/or terminal. Of course, the processor and the storage medium may also exist in the network device or the terminal device as discrete components.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in 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 may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable apparatus. The computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website site, computer, A server or data center transmits by wire or wireless 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, data center, or the like that integrates one or more available media. The usable media may be magnetic media, such as floppy disks, hard disks, magnetic tapes; optical media, such as digital video discs; and semiconductor media, such as solid-state drives.

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

In this application, "at least one" means one or more, and "plurality" means two or more. "And/or", which describes the relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, it can indicate that A exists alone, A and B exist at the same time, 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 a kind of "or" relationship; in the formula of this application, the character "/" indicates that the related objects are a kind of "division" Relationship.

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

Claims (30)

1. A method of communication, comprising:

the network equipment determines 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 N _T ×N _T The ith column element in the first weight matrix corresponds to the ith transmitting port of the network device, i is 1, 2 … … N _T ，N _T ＞1；

The network device passes through the N _T The transmitting ports respectively transmit the first signals;

the network equipment receives channel state information from a terminal device, wherein the channel state information is obtained by the terminal device according to the channel state information reference signal and the N from the terminal device _T The first signals respectively received by the transmitting ports are obtained by channel measurement.

2. The method of claim 1, wherein the first transmission signal is based on

Determining;

wherein,

in order to be said first weight matrix,

rank is the Rank for the channel state information reference signal.

3. A method of communication, comprising:

the terminal devices respectively receive N from the network equipment _T A first signal of each transmission port, where the first signal is determined by the network device according to a first weight matrix and the csi reference signal, where the first weight matrix is N _T ×N _T The ith column element in the first weight matrix corresponds to the ith transmitting port of the network device, i is 1, 2 … … N _T ，N _T ＞1；

The terminal device receives the channel state information reference signal and the N-bit sequence of the terminal device according to the channel state information reference signal _T The first signals respectively received by the transmitting ports are subjected to channel measurement to obtain channel state information;

and the terminal device sends the channel state information to the network equipment.

4. The method of claim 3, wherein the terminal device is configured to receive the CSI-RS from the N terminal device based on the CSI-RS and the CSI-RS _T The method for measuring channels of first signals respectively received by the transmitting ports to obtain channel state information includes:

the terminal device receives the CSI-RS and the N-th reference signal from the terminal device _T Determining an equivalent channel matrix between the terminal device and the network equipment according to the first signals respectively received by the transmitting ports;

and the terminal device determines the channel state information according to the equivalent channel matrix.

5. The method of claim 4, wherein the equivalent channel matrix conforms to the following equation:

wherein,

for the terminal device from the N _T The first signals respectively received by the transmitting ports,

for the equivalent channel matrix, N _R Rank is a Rank, which is the number of receiving ports of the terminal device,

is a channel matrix between the terminal device and the network equipment,

for the first weight matrix, the weight matrix is,

and the reference signal is the channel state information.

6. The method of any one of claims 1-5, wherein N is _T 2, the first weight matrix is:

7. the method of any one of claims 1-5, wherein N is _T 4, the first weight matrix is:

8. a method of communication, comprising:

network device passing N _T Each transmitting port respectively transmits a channel state information reference signal;

the network equipment acquires first information, wherein the first information is used for determining a second weight matrix, and the second weight matrix is N _T ×N _T The ith row and the ith column of elements in the second weight matrix are respectively received by the terminal device from the N _T Determining the received signal strength of the csi reference signals of each transmitting port, wherein i-th row and i-th column elements in the second weight matrix are inversely related to the received signal strengths of the csi reference signals from the i-th transmitting port respectively received by the terminal device, i is 1, 2 … … N _T ；

The network equipment 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 equipment passes through the N _T The transmitting ports respectively transmit the second signals;

the network equipment receives channel state information from the terminal device, wherein the channel state information is obtained by the terminal device according to the channel state information reference signal and the N from the terminal device _T The second signals respectively received by the transmitting ports are obtained by channel measurement.

9. The method of claim 8, wherein the first information is used for indicating the second weight matrix, or wherein the first information is used for indicating ith row and ith column elements in the second weight matrix, or wherein the first information is used for indicating that the terminal device respectively receives signals from the N _T A received signal strength of the channel state information reference signal of each transmit port.

10. A method according to claim 8 or 9, wherein the second signal is based on

Determining;

wherein,

rank is the Rank for the second weight matrix,

and a reference signal for the channel state information.

11. A method of communication, comprising:

the terminal devices respectively receive N from the network equipment _T Channel state information reference signals of the transmitting ports;

the terminal device toThe network equipment sends first information, the first information is used for determining a second weight matrix, and the second weight matrix is N _T ×N _T The ith row and the ith column elements in the second weight matrix are respectively received by the terminal device from the N _T Determining the received signal strength of the csi reference signals of each transmitting port, wherein i-th row and i-th column elements in the second weight matrix are inversely related to the received signal strengths of the csi reference signals from the i-th transmitting port respectively received by the terminal device, i is 1, 2 … … N _T ；

The terminal device receives the data from the N _T A second signal of each transmission port, wherein 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 receives the channel state information reference signal and the N-bit sequence of the terminal device according to the channel state information reference signal _T The second signals respectively received by the sending ports are subjected to channel measurement to obtain channel state information;

and the terminal device sends the channel state information to the network equipment.

12. The method of claim 11, wherein the first information is used for indicating the second weight matrix, or the first information is used for indicating ith row and ith column elements in the second weight matrix, or the first information is used for indicating the terminal device respectively received from the N _T A received signal strength of the channel state information reference signal of each transmit port.

13. The method according to claim 11 or 12, wherein the terminal device is based on the channel state information reference signal and the terminal device slave N _T The method for measuring channels of first signals respectively received by the transmitting ports to obtain channel state information includes:

the terminal device refers to according to the channel state informationSignal and said terminal device from said N _T Determining an equivalent channel matrix between the terminal device and the network equipment according to the second signals respectively received by the transmitting ports;

and the terminal device determines the channel state information according to the equivalent channel matrix.

14. The method of claim 13, wherein the equivalent channel matrix conforms to the following equation:

wherein,

for the terminal device from the N _T The second signals respectively received by the transmitting ports,

for the equivalent channel matrix, N _R Rank is a Rank, which is the number of reception ports of the terminal device,

is a channel matrix between the terminal device and the network equipment,

for the second weight matrix, the weight matrix is,

is the channel state information reference signal.

15. A network device, comprising a processing module and a transceiver module:

the transceiver module is used for the network equipment to communicate with a terminal device;

the processing module is configured to execute, by the transceiver module:

determining a first signal according to a first weight matrix and a channel state information reference signal to be transmitted, wherein the first weight matrix is N _T ×N _T The ith column element in the first weight matrix corresponds to the ith transmitting port of the network device, i is 1, 2 … … N _T ，N _T ＞1；

By said N _T The transmitting ports respectively transmit the first signals;

receiving channel state information from the terminal device, the channel state information being based on the channel state information reference signal and the N from the terminal device _T The first signals respectively received by the transmitting ports are obtained by channel measurement.

16. The network device of claim 15, wherein the first transmission signal is based on

Determining;

wherein,

in order to be said first weight matrix,

rank is the Rank for the channel state information reference signal.

17. A terminal device is characterized by comprising a processing module and a transceiver module:

the receiving and sending module is used for the communication between the terminal device and the network equipment;

the processing module is configured to execute, by the transceiver module:

respectively receiving N from the network equipment _T A transmitting portThe first signal is determined by the network device according to a first weight matrix and the channel state information reference signal, wherein the first weight matrix is N _T ×N _T The ith column element in the first weight matrix corresponds to the ith transmitting port of the network device, i is 1, 2 … … N _T ，N _T ＞1；

Receiving the channel state information reference signal and the terminal device from the N _T The first signals respectively received by the sending ports are subjected to channel measurement to obtain channel state information;

and sending the channel state information to the network equipment.

18. The terminal apparatus of claim 17, wherein the processing module is specifically configured to:

receiving the channel state information reference signal and the terminal device from the N _T Determining an equivalent channel matrix between the terminal device and the network equipment according to the first signals respectively received by the transmitting ports;

and determining the channel state information according to the equivalent channel matrix.

19. The terminal apparatus of claim 18, wherein the equivalent channel matrix conforms to the following equation:

wherein,

for the terminal device from the N _T The first signals respectively received by the transmitting ports,

for the equivalent channel matrix, N _R Is the terminalThe number of receive ports of the device, Rank, is the Rank,

is a channel matrix between the terminal device and the network equipment,

for the first weight matrix, the weight matrix is,

is the channel state information reference signal.

20. A terminal device according to any of claims 15-19, characterised in that N _T 2, the first weight matrix is:

21. a terminal device according to any of claims 15-19, characterised in that N _T 4, the first weight matrix is:

22. a network device, comprising a processing module and a transceiver module:

the transceiver module is used for the network equipment to communicate with a terminal device;

the processing module is configured to execute, by the transceiver module:

by N _T Each transmitting port respectively transmits a channel state information reference signal;

obtaining first information, the first information being used for determining a second weight matrix, the second weightThe value matrix is N _T ×N _T The ith row and the ith column elements in the second weight matrix are respectively received by the terminal device from the N _T Determining the received signal strength of the csi reference signals of each transmitting port, wherein i-th row and i-th column elements in the second weight matrix are inversely related to the received signal strength of the csi reference signals from the i-th transmitting port respectively received by the terminal device, i is 1, 2 … … N _T ；

Determining a second signal according to the second weight matrix and the channel state information reference signal;

by said N _T The transmitting ports respectively transmit the second signals;

receiving channel state information from the terminal device, the channel state information being based on the channel state information reference signal and the N from the terminal device _T The second signals respectively received by the transmitting ports are obtained by channel measurement.

23. The network device of claim 22, wherein the first information is used to indicate the second weight matrix, or the first information is used to indicate ith row and ith column elements in the second weight matrix, or the first information is used to indicate the terminal device respectively received from the N _T A received signal strength of the channel state information reference signal of each transmit port.

24. Network device according to claim 22 or 23, wherein said second signal is based on

Determining;

wherein,

rank is the Rank for the second weight matrix,

and the reference signal is the channel state information.

25. A terminal device is characterized by comprising a processing module and a transceiver module:

the receiving and sending module is used for the communication between the terminal device and the network equipment;

the processing module is configured to execute, by the transceiver module:

respectively receiving N from the network equipment _T Channel state information reference signals of the transmitting ports;

sending first information to the network device, where the first information is used to determine a second weight matrix, where the second weight matrix is N _T ×N _T The ith row and the ith column elements in the second weight matrix are respectively received by the terminal device from the N _T Determining the received signal strength of the csi reference signals of each transmitting port, wherein i-th row and i-th column elements in the second weight matrix are inversely related to the received signal strengths of the csi reference signals from the i-th transmitting port respectively received by the terminal device, i is 1, 2 … … N _T ；

Receiving from the N _T A second signal of each transmission port, wherein the second signal is determined by the network device according to the second weight matrix and the channel state information reference signal;

receiving the channel state information reference signal and the terminal device from the N _T The second signals respectively received by the sending ports are subjected to channel measurement to obtain channel state information;

and sending the channel state information to the network equipment.

26. The terminal apparatus of claim 25, wherein the first information is used to indicate the second weight matrix, or wherein the first information is used to indicate the second weight matrixIndicating ith row and ith column elements in the second weight matrix, or the first information is used for indicating that the terminal device respectively receives information from the N _T A received signal strength of the channel state information reference signal of each transmit port.

27. The terminal apparatus according to claim 25 or 26, wherein the processing module is specifically configured to:

receiving the channel state information reference signal and the terminal device from the N _T Determining an equivalent channel matrix between the terminal device and the network equipment according to the second signals respectively received by the transmitting ports;

and determining the channel state information according to the equivalent channel matrix.

28. The terminal apparatus of claim 27, wherein the equivalent channel matrix conforms to the following equation:

wherein,

for the terminal device from the N _T A second signal received by each of the transmit ports,

for the equivalent channel matrix, N _R Rank is a Rank, which is the number of receiving ports of the terminal device,

is a channel matrix between the terminal device and the network equipment,

is the firstTwo weight value matrixes are used for calculating the weight value,

and the reference signal is the channel state information.

29. A communication system comprising a network device according to claim 15 or 16, and comprising a terminal apparatus according to any of claims 17-21; or comprising a network device according to any of claims 22-24 and comprising a terminal device according to any of claims 25-28.

30. A computer-readable storage medium, in which a computer program is stored which, when run on a computer, causes the computer to carry out the method of any one of claims 1 to 14.

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