WO2025139591A1 - Precoding parameter transmission method, apparatus and system - Google Patents

Abstract

A precoding parameter transmission method, an apparatus and a system, which relate to the technical field of communications, and can achieve efficient precoding and improve communication performance. The method comprises: broadcasting or multicasting a first precoding parameter; and sending a second precoding parameter, the first precoding parameter and the second precoding parameter being used for determining a transmit precoding matrix of a terminal. The terminal can independently generate the transmit precoding matrix on the basis of the first precoding parameter and the second precoding parameter, and can determine the transmit precoding matrix without reporting to a network device a second time. The present solution can reduce signaling overhead and time delay, thus allowing network devices to inform terminals of codebooks more efficiently, and supporting a large number of terminals performing uplink transmission at the same time in overload scenarios.

Description

Precoding parameter transmission method, device and system

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 29, 2023, with application number 202311865391.9 and application name “Precoding parameter transmission method, device and system”, all contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of communication technology, and in particular to a method, device and system for transmitting precoding parameters.

Background Art

At present, the precoding technology can be used between the terminal and the network device to correct the channel H between the terminal and the network device, so that the precoded channel can improve the throughput of the receiver and reduce the interference between multiple terminals. The relevant technology provides a codebook-based precoding scheme and a non-codebook-based precoding scheme, but the current precoding scheme has low precoding efficiency and poor communication performance between the terminal and the network device.

Summary of the invention

The present application provides a precoding parameter transmission method, device and system for efficient precoding to improve communication performance.

In order to achieve the above objectives, this application adopts the following technical solutions:

In a first aspect, the technical solution of the present application provides a precoding parameter transmission method, which can be applied to a network device or a component that supports the functions of the network device (such as a chip system), and the method includes: broadcasting or multicasting a first precoding parameter; sending a second precoding parameter, and the first precoding parameter and the second precoding parameter are used to determine the terminal's transmit precoding matrix.

Compared with the non-codebook solution, after the terminal determines the uplink candidate precoding matrix by itself, it needs to report to the base station through SRS to determine the final precoding matrix to be used according to the instructions of the base station, resulting in high signaling overhead. In the solution of the present application, the network device indicates the generation parameters of the transmit precoding matrix, and the generation parameters include the first precoding parameter and the second precoding parameter. In this way, the terminal can generate the transmit precoding matrix by itself according to the generation parameters, and can determine the transmit precoding matrix without reporting to the network device for the second time, which can reduce signaling overhead, and has low latency, and can notify the terminal of the codebook more efficiently. This solution can support a large number of terminals performing uplink transmission at the same time in an overload scenario.

In addition, compared with the codebook transmission solution, the codebook of the present application is generated by the terminal itself, is not fixed, is more flexible, has better performance, and can meet the communication needs of a large number of terminals.

In one possible design, the first precoding parameter is used to indicate spatial information of an uplink between the terminal and a network device.

This method enables each terminal to refer to the first precoding parameter (indicating the spatial information of each uplink) when determining the transmit precoding matrix, so that the determined transmit precoding matrix can be more accurate, and the interference between the transmitted signals shaped by the transmit precoding matrix can be reduced as much as possible, thereby improving the uplink transmission performance. In an overload scenario, even if a large number of terminals transmit at the same time, the use of this solution can also reduce the interference between multiple terminals as much as possible.

Exemplarily, the first precoding parameter and the second precoding parameter are jointly used for precoding, which can make the equivalent channels received by the network device for multiple terminals appear sparse, thereby reducing interference between the multiple terminals.

In one possible design, the first precoding parameter includes at least one of the following: information about a receiving matrix used by the network device to receive uplink signals, information about a receiving beam used by the network device to receive the uplink signals, information about an antenna panel used by the network device to receive the uplink signals, and information about a port used by the network device to receive the uplink signals.

In one possible design, the first precoding parameter is carried in a reference signal sent to the terminal.

The solution of the present application can avoid the performance loss caused by quantizing the spatial information of the uplink and improve the codebook accuracy by carrying the first precoding parameter through the reference signal.

In one possible design, the reference signal sent to the terminal Satisfies the following relationship: The W represents a receiving matrix corresponding to the first precoding parameter, and the x represents a reference signal configured for the terminal.

In a possible design, the second precoding parameter includes m third precoding parameters: the m third precoding parameters correspond to j time-frequency resources of the terminal, where j is a positive integer, and m is a positive integer less than or equal to j;

The first precoding parameter includes i fourth precoding parameters, and the i fourth precoding parameters correspond to l time-frequency resources of the terminal, where l is a positive integer and i is a positive integer less than or equal to l.

This method can perform precoding according to a certain time-frequency resource granularity (such as subband). Resources of different granularities can have different precoding parameters (such as receiving matrix, decomposition method). For example, the first precoding parameter and the second precoding parameter corresponding to different subbands can be independently configured, making the precoding parameter transmission method more flexible and more conducive to reducing interference between multiple terminals.

In one possible design, it also includes:

Sending association information between the first precoding parameter and the time-frequency resource and association information between the second precoding parameter and the time-frequency resource.

The method can associate the first precoding parameter with the second precoding parameter through the association information between the first precoding parameter and the time-frequency resource and the association information between the second precoding parameter and the time-frequency resource, so that the terminal can determine the first precoding parameter and the associated second precoding parameter required for precoding at time T, and perform precoding accordingly. The terminal generates a transmit precoding matrix by itself, avoiding the loss of quantization accuracy caused by the network device directly sending the transmit precoding matrix.

In one possible design, the first precoding parameter and the second precoding parameter are used to determine a transmit precoding matrix of a terminal, including: the second precoding parameter and a reference signal sent to the terminal are used to determine the transmit precoding matrix.

In one possible design, it also includes:

A mapping pattern is sent, where the mapping pattern is used to indicate a precoding order of the terminal on M time-frequency resources, where M is a positive integer.

In this method, the interference received by terminal p is related to the precoding order of terminal p among multiple terminals scheduled by MU-MIMO. The earlier the precoding order of terminal p is, the less interference it receives from other terminals and the higher the SINR. Conversely, the later the precoding order of terminal p is, the more interference it receives from other terminals and the lower the SINR. Therefore, in this application, the precoding order of the above-mentioned multiple terminals on different resources can be changed, and a mapping pattern can be sent to reduce the probability and possibility that the terminal is always in a low SINR, so that the average SINR of the above-mentioned multiple terminals on multiple resources converges, thereby improving the average detection performance of the multiple terminals.

In one possible design, the M time-frequency resources include j time-frequency resources; the second precoding parameters include: the second precoding parameters corresponding to the j time-frequency resources of the terminal; the precoding orders of the terminal in the j time-frequency resources are different.

In this method, if the precoding order of the multiple terminals on the multiple time-frequency resources is the same, the network device can send the second precoding parameter corresponding to one of the multiple time-frequency resources to reduce signaling overhead. That is, the network device does not need to send the second precoding parameter corresponding to each time-frequency resource.

In one possible design, the M time-frequency resources include time-frequency resource n; the second precoding parameter does not include the second precoding parameter of the terminal in the time-frequency resource n; the precoding order of the terminal in the time-frequency resource n is the same as the precoding order of the terminal in at least one time-frequency resource among the j time-frequency resources.

In one possible design, it also includes:

Resource configuration information for sending the reference signal, wherein the number of ports indicated by the resource configuration information is the same as at least one of the following: the number of antennas and the number of beams of the network device.

In this way, the terminal can measure the information of all antennas or ports of the network device to match and obtain a complete receiving matrix.

In a possible design, the M time-frequency resources are resources used by the terminal for multiple transmissions, or are resources used by the terminal for one transmission.

Exemplarily, in each transmission of the terminal, there may be a different transmit precoding matrix, and the transmit precoding matrix of the terminal is associated with the receive matrix W of the network device. Exemplarily, K transmissions may be associated with K different Ws. Alternatively, K transmissions may be associated with K identical Ws and K different second precoding parameters.

In one possible design, it also includes:

Send at least one of the following information: a carrying mode of the first precoding parameter, a time-frequency resource of the first precoding parameter, the number of the first precoding parameters, the dimension of the first precoding parameter, the resource granularity of the first precoding parameter, the quantization method of the first precoding parameter, the quantization accuracy of the first precoding parameter; the resource granularity of the second precoding parameter, and the number of the transmit precoding matrices;

The time-frequency resources of the first precoding parameter include: resources of a reference signal carrying the first precoding parameter.

In one possible design, it also includes:

Sending indication information, where the indication information is used to instruct the terminal to use the first precoding parameter and the second precoding parameter to determine the transmit precoding matrix.

In one possible design, the second precoding parameter includes at least one of the following: position information of the effective channel factor of the terminal in the equivalent channel factor, and a method for generating the transmit precoding matrix.

In a second aspect, a precoding parameter transmission method is provided, which can be applied to a terminal or a component supporting terminal functions (such as a chip system), and the method includes: receiving a first precoding parameter broadcast or multicast by a network device; receiving a second precoding parameter; and determining a transmit precoding matrix based on the first precoding parameter and the second precoding parameter.

In one possible design, the first precoding parameter is used to indicate spatial information of an uplink between the terminal and a network device.

In one possible design, the first precoding parameter includes at least one of the following: information about a receiving matrix used by the network device to receive uplink signals, information about a receiving beam used by the network device to receive the uplink signals, information about an antenna panel used by the network device to receive the uplink signals, and information about a port used by the network device to receive the uplink signals.

In one possible design, the first precoding parameter is carried in a reference signal sent by a network device to the terminal.

In one possible design, it also includes:

measuring the reference signal;

Determining a transmit precoding matrix according to the first precoding parameter and the second precoding parameter includes:

The transmit precoding matrix is determined according to the measurement result of the reference signal, the first precoding parameter and the second precoding parameter.

In a possible design, the second precoding parameter includes m third precoding parameters: the m third precoding parameters correspond to j time-frequency resources of the terminal, where j is a positive integer, and m is a positive integer less than or equal to j;

The first precoding parameter includes i fourth precoding parameters, and the i fourth precoding parameters correspond to l time-frequency resources of the terminal, where l is a positive integer and i is a positive integer less than or equal to l.

In one possible design, it also includes:

The association information between the first precoding parameter and the time-frequency resource and the association information between the second precoding parameter and the time-frequency resource are received.

In one possible design, it also includes:

Determining the first precoding parameter according to association information between the first precoding parameter and the time-frequency resource;

The second precoding parameter is determined according to association information between the second precoding parameter and the time-frequency resource.

In one possible design, it also includes:

A mapping pattern is received, where the mapping pattern is used to indicate a precoding order of the terminal on M time-frequency resources, where M is a positive integer.

In one possible design, the M time-frequency resources include j time-frequency resources; the second precoding parameters include: the second precoding parameters corresponding to the j time-frequency resources of the terminal; the precoding orders of the terminal in the j time-frequency resources are different.

In one possible design, it also includes:

Receive resource configuration information of the reference signal, where the number of ports indicated by the resource configuration information is the same as at least one of the following: the number of antennas and the number of beams of the network device.

In one possible design, it also includes:

Receive at least one of the following information: a carrying mode of the first precoding parameter, a time-frequency resource of the first precoding parameter, the number of the first precoding parameters, the dimension of the first precoding parameter, the resource granularity of the first precoding parameter, the quantization method of the first precoding parameter, the quantization accuracy of the first precoding parameter; the resource granularity of the second precoding parameter, and the number of the transmit precoding matrices;

The time-frequency resources of the first precoding parameter include: resources of a reference signal carrying the first precoding parameter.

In one possible design, the second precoding parameter includes at least one of the following: position information of the effective channel factor of the terminal in the equivalent channel factor, and a method for generating the transmit precoding matrix.

In a third aspect, a communication device is provided, comprising a processor and a memory. The memory is used to store a computer program (also referred to as an instruction or code), and the processor is used to execute the computer program so that the communication device executes the method of any aspect or any implementation method of any aspect.

In a fourth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program (also referred to as an instruction or code), and when the computer program is executed by a communication device, the communication device executes the method of any aspect or any implementation of any aspect.

According to a fifth aspect, a computer program product is provided. When the computer program product is executed on a communication device, the communication device executes a method of any aspect or any implementation scheme of any aspect.

According to a sixth aspect, a circuit system is provided, the circuit system comprising a processing circuit, wherein the processing circuit is configured to execute a method of any aspect or any implementation of any aspect.

In the seventh aspect, a chip system is provided, comprising at least one processor and at least one interface circuit, wherein the at least one interface circuit is used to perform transceiver functions and send instructions to the at least one processor, and when the at least one processor executes the instructions, the at least one processor executes the method of any aspect or any implementation method of any aspect.

In an eighth aspect, a communication device is provided, which has the function of implementing the method described in any of the above aspects and any possible implementation thereof. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In a ninth aspect, a communication system is provided, comprising a network device as in any of the above aspects and any possible one thereof and a terminal as in any of the above aspects and any possible one thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

Figures 1 and 2 are schematic diagrams of the system architecture provided in the embodiments of the present application;

FIG3 is a schematic diagram of the structure of the device/apparatus provided in an embodiment of the present application;

FIG4 is a schematic diagram of a flow chart of a method for transmitting precoding parameters according to an embodiment of the present application;

FIG5 is a schematic diagram of a sparse equivalent channel provided in an embodiment of the present application;

FIG6 is a schematic diagram of a scenario of explicitly indicating precoding parameters provided in an embodiment of the present application;

FIG7 is a schematic diagram of a process of implicitly indicating precoding parameters according to an embodiment of the present application;

FIG8 is a schematic diagram of a scenario of implicitly indicating precoding parameters provided in an embodiment of the present application;

FIG9 is a schematic diagram of a scenario in which precoding parameters are indicated according to resource granularity according to an embodiment of the present application;

FIG10 is a schematic diagram of a scenario considering a precoding order provided in an embodiment of the present application;

FIG. 11 and FIG. 12 are schematic diagrams of scenarios of association information between time-frequency resources and precoding parameters provided in an embodiment of the present application;

FIG13 is a schematic diagram of the structure of a device provided in an embodiment of the present application;

FIG14 is a schematic diagram of the structure of a chip system provided in an embodiment of the present application.

DETAILED DESCRIPTION

First, the terms involved in the embodiments of the present application are introduced:

1. Port: Also known as antenna port, it can be understood as a virtual antenna recognized by the receiving device. Port is a logical concept. A port can be a physical transmitting antenna or multiple physical transmitting antennas. The signal sent through the same port, regardless of whether the signal is sent through the same or different physical antennas, the channel corresponding to the signal in spatial transmission can be considered the same or related. In other words, the receiving end can identify signals of different channels through the port, and the receiving end can consider the channels to be the same or related when demodulating the signal sent from the same port.

Optionally, the port may refer to a transmitting port. For example, the reference signal of each port may be a reference signal that has not been precoded, or a reference signal obtained by precoding the reference signal based on a delay vector. The number of ports may refer to the number of transmitting ports, or the number of transmitting antennas.

Optionally, the port may refer to a reference signal port after beamforming. For example, the reference signal of each port may be a reference signal obtained by precoding the reference signal based on an angle vector. Alternatively, it may be a reference signal obtained by precoding the reference signal based on an angle vector and a delay vector. The number of ports may refer to the number of reference signal ports, or the number of angle vectors. It is understandable that the number of reference signal ports after beamforming may be less than the number of transmission ports.

2. Reference signal (RS): A reference signal may also be referred to as a pilot, a reference sequence, a pilot sequence, a pilot signal, etc. In an embodiment of the present application, a reference signal may be a reference signal for channel measurement. For example, the reference signal may be a channel state information reference signal (CSI-RS) for downlink channel measurement, or a sounding reference signal (SRS) for uplink channel measurement. It should be understood that the reference signals listed above are only examples and should not constitute any limitation to the embodiments of the present application. The embodiments of the present application do not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

3. Precoded reference signal: may refer to a reference signal obtained after precoding a reference signal. Exemplarily, precoding may include beamforming and/or phase rotation. For example, the downlink reference signal may be precoded based on one or more angle vectors to achieve beamforming. For another example, the downlink reference signal may be precoded based on one or more delay vectors to achieve phase rotation.

4. Channel reciprocity: In the time division duplexing (TDD) mode, within a relatively short time (such as the coherence time of channel transmission), it can be considered that the channel fading experienced by the signals on the uplink and downlink channels is the same. In contrast, in the frequency division duplexing (FDD) mode, since the frequency band interval of the uplink and downlink channels is much larger than the coherence bandwidth, the uplink and downlink channels do not have complete reciprocity. The uplink and downlink channels in the FDD mode can have partial reciprocity, for example, the reciprocity of angles and the reciprocity of delays. Accordingly, angles and delays can also be called reciprocity parameters.

5. Precoding: When the channel state is known, the transmitting device can precode the transmitted signal with the help of a precoding matrix that matches the channel state, so that the precoded transmitted signal is adapted to the channel, thereby reducing the complexity of the receiving device to eliminate the influence between channels. It can be seen that by precoding the transmitted signal, the quality of the received signal (such as signal to interference plus noise ratio (SINR)) can be improved. In addition, the use of precoding technology can enable multiple devices to transmit on the same time-frequency resources, that is, to achieve multiple user multiple input multiple output (MU-MIMO). It should be understood that the relevant description of the precoding technology in this article is only for the sake of understanding and is not intended to limit the scope of protection of the embodiments of the present application. In the specific implementation process, the transmitting device can also perform precoding in other ways. For example, when the channel information (such as but not limited to the channel factor (also known as the channel matrix)) cannot be obtained, a preset precoding matrix or weighted processing method is used for precoding.

6. Precoding Matrix The precoding matrix may be determined based on the channel factors of each frequency domain unit. The channel factor may be determined by the terminal through channel estimation or other methods or based on channel reciprocity. For example, the terminal may obtain the precoding matrix by performing singular value decomposition (SVD) on the channel factor or the covariance matrix of the channel factor. Alternatively, the precoding matrix may be obtained by performing eigenvalue decomposition (EVD) on the covariance matrix of the channel factor.

6-1: Orthogonal triangular (QR) decomposition

The QR decomposition method is to convert the matrix Decompose into an upper triangular matrix With an orthogonal matrix The product of satisfies:

R is an n-by-n upper triangular matrix and 0 is an (m-n)-by-n zero matrix, where n ≤ m.

6-2: RQ decomposition

RQ decomposition is to transform the matrix Decompose into an upper triangular matrix With an orthogonal matrix The product of satisfies:
A＝RQ

Opposite Phalanx For example, there is a connection between its RQ decomposition and QR decomposition, and the result of RQ decomposition can be used to implement QR decomposition, as follows:

Define the matrix P: P is a diagonal matrix, where the value of the element at the position of ... is 1 and the value of the element at the blank position is 0.

The above matrices satisfy:

(1)

(2)

(3)

(4)

The matrix can be defined according to the above RQ decomposition for n≤m:

in, is an upper triangular matrix, is an orthogonal matrix that satisfies:

Select the (mn)+1th to mth rows of A as the matrix A ₂ , and use the RQ decomposition method of the square matrix to obtain R, Q, satisfying:
T＝A ₁ Q ^-1 ＝A ₁ Q ^H

7. Codebook-based precoding technology

In space division multiplexing (SDMA), the base station's receiving matrix W and the terminal's transmit precoding matrix The channel H can be transformed into several orthogonal spatial directions, thereby achieving spatial _orthogonal transmission of multiple terminals on the same time-frequency resources. Can be a channel matrix The SVD decomposition result is:

in, is a diagonal matrix,

It can be the column vector of V _k corresponding to the first 1≤L≤N _t largest element values in D _k , and the corresponding W _k is the column vector of U _k corresponding to the first 1≤L≤N _t largest element values in D _k . W _k can also be a matrix that meets the requirements after processing V _k and U _k .

In the MU-MIMO scenario, although the _Hk of different terminals overlap in space, the base station can divide the channel into orthogonal or nearly orthogonal spatial resources as much as possible according to specific criteria. To avoid interference between terminals. When the number of terminals N _UE is small, the number of antennas _NR of the base station is much larger than N _UE * number of spatial streams L. It is not difficult to find the above-mentioned spatial resources, but the number of antennas of the base station is fixed. As the number of terminals increases, it is difficult for the base station to determine the antennas that meet the requirements.

In the codebook-based solution, the base station maintains a fixed codebook and selects the terminal's The terminal uses the base station selected Perform spatial shaping on the transmitted signal.

In this type of precoding scheme, all terminals use the same codebook, which is not flexible enough. Moreover, as the number of terminals increases, the interference increases accordingly, making it difficult to meet the requirements of spatial access of a large number of terminals. In addition, the base station needs to send the precoding matrix to each terminal separately, which results in high signaling overhead.

8. Non-codebook based precoding technology

In this method, the terminal generates a codebook by itself and reports information of the codebook generated by itself to the base station, and then the base station notifies the terminal of the precoding matrix to be used.

Taking the NR protocol as an example, the non-codebook based uplink transmission includes the following steps:

(1. The network device sends a channel state information reference signal (CSI-RS) to the terminal.

(2. After receiving the CSI-RS, the terminal measures the downlink channel quality and calculates the uplink channel quality based on the channel reciprocity and the downlink channel quality. After that, the terminal determines multiple uplink candidate precoding matrices (candidate precoders) according to the uplink channel quality and sends multiple SRSs. Each SRS corresponds to an uplink candidate precoding matrix. There is an association relationship between CSI-RS and SRS resources. For example, multiple CSI-RS are associated with multiple SRS resources, or there is an association relationship between CSI-RS and a set of SRS resources.

(3. The network device selects the precoding matrix corresponding to the SRS with the best reception quality according to the multiple SRSs received, and sends downlink control information (DCI) to the terminal.

(4. The terminal receives the DCI and selects the corresponding precoding matrix and number of transmission layers according to the SRI field in the DCI.

In the non-codebook based precoding scheme, after the terminal obtains the uplink candidate precoding matrix, it needs to report the information of the uplink candidate precoding matrix through SRS, and the base station indicates the port and precoding matrix that the terminal needs to use in the end. In other words, multiple interactions are required between the terminal and the base station. For example, according to the above mechanism, there are 4 rounds of interactions to determine the precoding matrix that the terminal will eventually use, and the delay is relatively high.

In addition, in this scheme, the precoding matrix of each terminal is determined independently, and each terminal needs more communication resources (such as signaling) to determine the precoding matrix. When there are many users, this will undoubtedly lead to tight communication resources.

In summary, both non-codebook and codebook-based precoding have large signaling overheads and are difficult to support scenarios where a large number of terminals access the space.

To solve the above technical problems, an embodiment of the present application provides a precoding parameter transmission method. FIG. 1 is a schematic diagram of the architecture of a communication system 1000 applied in an embodiment of the present application. As shown in FIG. 1 , the communication system includes a radio access network (RAN) 100. Among them, RAN 100 includes at least one RAN node (such as 110a and 110b in FIG. 1 , collectively referred to as 110), and may also include at least one terminal (such as 120a-120j in FIG. 1 , collectively referred to as 120). RAN 100 may also include other RAN nodes, for example, wireless relay equipment and/or wireless backhaul equipment (not shown in FIG. 1 ). The terminal 120 is connected to the RAN node 110 wirelessly. Terminals and terminals and RAN nodes and RAN nodes may be connected to each other by wire or wirelessly. Optionally, the communication system 1000 also includes a core network 200. The RAN node 110 is connected to the core network 200 by wireless or wire. The core network device in the core network 200 and the RAN node 110 in the RAN 100 may be independent different physical devices, or may be the same physical device integrating the logical functions of the core network device and the logical functions of the RAN node. Optionally, the communication system 1000 further includes the Internet 300 .

RAN100 may be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, and a future radio access system defined in the 3rd generation partnership project (3GPP). RAN100 may also include two or more of the above different radio access systems. RAN100 may also be an open RAN (O-RAN).

RAN node, also known as radio access network equipment, RAN entity, network equipment or access node, is used to help terminals access the communication system wirelessly. In an application scenario, the RAN node can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in the fifth generation (5G) mobile communication system, a next generation NodeB in the sixth generation (6G) mobile communication system, or a base station in a future mobile communication system. The RAN node can be a macro base station (such as 110a in FIG1 ), a micro base station or an indoor station (such as 110b in FIG1 ), or a relay node or a donor node.

In another application scenario, the cooperation of multiple RAN nodes can help the terminal achieve wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU) or a radio unit (RU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part or all of the physical layer. For the specific description of the above-mentioned protocol layers, please refer to the relevant technical specifications of 3GPP. RU can be used to implement the transceiver function of the radio frequency signal. CU and DU can be two independent RAN nodes, or they can be integrated in the same RAN node, such as integrated in the baseband unit (BBU). The RU may be included in a radio frequency device, such as a remote radio unit (RRU) or an active antenna unit (AAU). The CU may be further divided into two types of RAN nodes: CU-control plane and CU-user plane.

In different systems, RAN nodes may have different names. For example, in an O-RAN system, CU may be called an open CU (open CU, O-CU), DU may be called an open DU (open DU, O-DU), and RU may be called an open RU (open RU, O-RU). The RAN node in the embodiments of the present application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. For example, the RAN node may be a server loaded with a corresponding software module. The embodiments of the present application do not limit the specific technology and specific device form adopted by the RAN node. For ease of description, the following description takes a base station as an example of a RAN node.

A terminal is a device with wireless transceiver function, which can send signals to a base station or receive signals from a base station. A terminal can also be called a terminal device, user equipment (UE), mobile station, mobile terminal, etc. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. A terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

Exemplarily, in the communication system, there is an entity that sends configuration information to another entity, and sends data to another entity, or receives data sent by another entity; another entity receives the configuration information, and sends data to the configuration information sending entity according to the configuration information, or receives data sent by the configuration information sending entity. As shown in Figure 1, when the sending entity of the configuration information is a network device, and the receiving entity of the configuration information is a terminal device (such as a UE), the network devices 110b and 120f-120h form a sub-communication system. In this sub-communication system, 120f-120h can send uplink data to the network device, and the network device can receive uplink data sent by 120f-120h. The network device can send configuration information to 120f-120h. In addition, a sub-communication system can also be formed between multiple UEs. In this case, the sending entity and the receiving entity of the configuration information can both be terminal devices. For example, in a vehicle networking system, terminal device 1 sends configuration information to terminal device 2 and receives data sent by terminal device 2; terminal device 2 receives configuration information sent by terminal device 1 and sends data to terminal device 1.

Base stations and terminals can be fixed or movable. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons, and artificial satellites. The embodiments of this application do not limit the application scenarios of base stations and terminals.

The roles of the base station and the terminal can be relative. For example, the helicopter or drone 120i in FIG. 1 can be configured as a mobile base station. For the terminal 120j that accesses the wireless access network 100 through 120i, the terminal 120i is a base station; but for the base station 110a, 120i is a terminal, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between base stations. In this case, relative to 110a, 120i is also a base station. Therefore, base stations and terminals can be collectively referred to as communication devices. 110a and 110b in FIG. 1 can be referred to as communication devices with base station functions, and 120a-120j in FIG. 1 can be referred to as communication devices with terminal functions.

Base stations and terminals, base stations and base stations, and terminals and terminals can communicate through authorized spectrum, unauthorized spectrum, or both; they can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem including the base station function. The control subsystem including the base station function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or by a device including the terminal function.

In the embodiment of the present application, the base station sends a downlink signal or downlink information to the terminal, and the downlink information is carried on the downlink channel; the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on the uplink channel. In order to communicate with the base station, the terminal needs to establish a wireless connection with the cell controlled by the base station. The cell with which the terminal has established a wireless connection is called the service cell of the terminal. When the terminal communicates with the service cell, it will also be interfered by signals from neighboring cells.

In the embodiments of the present application, the time domain symbol may be an orthogonal frequency division multiplexing (OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol. If not otherwise specified, the symbols in the embodiments of the present application refer to time domain symbols.

The device names and message names in the embodiments of the present application are only examples. As the system evolves, the device names and message names may change.

FIG2 shows an example of the architecture of another system to which the embodiment of the present application is applicable. As shown in FIG2 , a terminal and a network device (such as a base station) can communicate through a relay node. The number of relay nodes can be one or more. Optionally, the form of the relay node can be, but is not limited to, a small station, an integrated access and backhauling (IAB) node, a DU, a terminal, or a TRP.

The solution of the embodiment of the present application can be used in the authorized transmission scenario, in which case the base station sends the uplink transmission configuration parameters to the UE, and the UE performs uplink data transmission based on the above configuration parameters. The solution of the embodiment of the present application can also be used in random access scenarios, unauthorized transmission scenarios, scenarios where multiple terminals use the same radio network temporary identifier (RNTI) to listen to the physical downlink control channel (PDCCH), scenarios where multiple terminals listen to the same physical downlink shared channel (PDSCH) or other scenarios. The solution of the embodiment of the present application can be applied to terminals in a connected state or an activated state (ACTIVE), and can also be used for terminals in a non-connected state (INACTIVE) or an idle state (IDLE), and there is no restriction on the state of the terminal to which the solution is applicable.

Some embodiments of the present application provide a device, which may be the above-mentioned terminal or network device or a corresponding chip or other component, etc. The device may include: a memory and one or more processors. The memory is coupled to the processor. The memory is used to store computer program code, and the computer program code includes computer instructions. When the processor executes the computer instructions, the device can perform each function or step in the above-mentioned method embodiment. The structure of the device can refer to the device (device) shown in Figure 3. As shown in Figure 3, the device includes at least one processor 501 and a memory 503. Optionally, the memory 503 may also be included in the processor 501.

Processor 501 can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

The memory 503 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may exist independently and be connected to the processor through a communication line. The memory may also be integrated with the processor.

The memory 503 is used to store computer-executable instructions for implementing the solution of the present application, and the execution is controlled by the processor 501. The processor 501 is used to execute the computer-executable instructions stored in the memory 503, thereby implementing the method provided in the following embodiments of the present application.

Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application code, instructions, computer program or other names, which are not specifically limited in the embodiments of the present application.

In a specific implementation, as an embodiment, the processor 501 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 3 .

In a specific implementation, as an embodiment, the device may include multiple processors, such as processor 501 and processor 504 in FIG. 3. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. The processor here may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

Optionally, the device may further include at least one communication interface 502. The communication interface 502 is used to communicate with other devices. In the embodiment of the present application, the communication interface may be a module, a circuit, a bus, an interface, a transceiver or other device capable of implementing a communication function, and is used to communicate with other devices. Optionally, when the communication interface is a transceiver, the transceiver may be an independently arranged transmitter, which may be used to send information to other devices, and the transceiver may also be an independently arranged receiver, which is used to receive information from other devices. The transceiver may also be a component that integrates the functions of sending and receiving information, and the embodiment of the present application does not limit the specific implementation of the transceiver.

It is understood that the structure shown in FIG3 does not constitute a specific limitation on the device. In other embodiments of the present application, the device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

Taking the interaction between a network device (such as a base station) and a terminal as an example, FIG4 shows an example of a process of a precoding parameter transmission method according to an embodiment of the present application. As shown in FIG4 , the method may include:

S101. A network device broadcasts or multicasts a first precoding parameter.

Correspondingly, the terminal receives the first precoding parameter.

The first precoding parameter is a precoding parameter shared by multiple terminals scheduled by MU-MIMO, and can be called a common precoder parameter. The first precoding parameters of the multiple terminals are the same. The first precoding parameter is used to indicate the spatial information of the uplink between the terminal and the network device. Or it can be understood that the spatial information of the uplink is desired in order to obtain a sparse equivalent channel. Or it can be understood that the first precoding parameter is used to indicate the receiving information of the network device. Or it can be understood that the first precoding parameter is used to determine the receiving processing of the terminal by the network device, or it can be understood that the receiving processing of the receiving side is desired in order to obtain a sparse equivalent channel. The first precoding parameter is used to: jointly determine the transmit precoding matrix of the terminal with the second precoding parameter of the terminal. Since each terminal refers to the spatial information of its own uplink when determining the transmit precoding matrix, the determined transmit precoding matrix can be made more accurate, the interference between the transmission signals shaped by the transmit precoding matrix can be reduced as much as possible, and the uplink transmission performance can be improved. In an overload scenario, even if a large number of terminals transmit at the same time, the present solution can reduce the interference between multiple terminals as much as possible.

Exemplarily, taking the case where the first terminal and the second terminal initiate uplink transmission to the base station (an example of a network device), the base station determines to pair the first terminal and the second terminal through scheduling decision to form a multi-user multi-input multi-output (MU-MIMO) uplink transmission of the first terminal and the second terminal, and the first terminal and the second terminal share the same uplink time-frequency resource and form space division multiplexing on the uplink time-frequency resource. For example, a physical uplink shared channel (PUSCH) is sent using different demodulation reference signal (DMRS) ports on the uplink time-frequency resource. As shown in Figure 4, the network device can broadcast or multicast the first precoding parameter shared by the first terminal and the second terminal.

Exemplarily, the UE may initiate uplink transmission via a scheduling request (SR) or a buffer status report (BSR).

Optionally, the first precoding parameter includes at least one of the following: information about a receiving matrix when the network device receives an uplink signal, information about a receiving beam used when the network device receives an uplink signal, processing information about a port associated with the network device receiving an uplink signal, and information about an antenna panel used when the network device receives an uplink signal. The uplink signal includes but is not limited to a PUSCH signal.

Exemplarily, the network device associates the spatial information of the uplink (such as the information of the expected receiving beam) with the synchronization signal block (synchronization signal/PBCH, SSB). The terminal obtains the spatial information associated with the SSB by measuring the SSB. In another exemplary embodiment, the network device associates the information of the receiving matrix with the downlink reference signal CSI-RS and sends the CSI-RS. The terminal measures the CSI-RS to obtain the information of the receiving matrix.

The solution of the embodiment of the present application multicasts or broadcasts the first precoding parameter shared by multiple terminals, which can reduce signaling overhead.

S102: The network device sends the second precoding parameters of each terminal. The first precoding parameters and the second precoding parameters are used to determine the transmit precoding matrix of the terminal.

Correspondingly, the terminal receives the second precoding parameter.

The second precoding parameter of the terminal can be regarded as a terminal-specific (UE-specific) precoding parameter. The second precoding parameters of multiple terminals scheduled by MU-MIMO can be different. Therefore, the network device needs to send (such as unicast) their respective second precoding parameters to different terminals.

Optionally, the second precoding parameter of the terminal includes: a generation method of a transmit precoding matrix of the terminal. Optionally, the generation method of the transmit precoding matrix includes any of the following methods: singular value decomposition (SVD), orthogonal projection decomposition, and RQ decomposition.

Optionally, the second precoding parameter may further include: position information posgrp of the effective channel factor of the terminal in the equivalent channel factor of the terminal. As a possible implementation manner, the equivalent channel factor of the terminal p is satisfy: Wherein, H _p represents the uplink channel factor of terminal p; W represents the receiving matrix of the network device for terminal p. In some examples, some elements of the equivalent channel factor can be used as the effective channel factor according to the position information posgrp.

Optionally, the second precoding parameter of the terminal includes: a method for obtaining a channel factor required for precoding calculation. In the first method, the network device may directly send down information of the uplink channel factor H _p . Alternatively, the processed H _p information may be sent down, and the terminal generates H _p based on the processed H _p information. For example, if the terminal adopts the SVD method, the network device may indicate the information of the receiving matrix and the uplink channel factor to the terminal through the second precoding parameter.

In the second mode, the terminal can obtain it locally, for example, the terminal obtains the uplink channel factor H _p based on uplink and downlink mutual differences and the downlink channel factor measured locally by the terminal. For example, if the terminal adopts the SVD mode, the network device can indicate the receiving matrix to the terminal through the second precoding parameter, and the terminal obtains the information of the uplink channel factor according to the measurement of the downlink channel.

In the third method, the terminal implicitly obtains the channel factor, such as obtaining the equivalent channel factor information based on the downlink CSI-RS. Alternatively, the method for obtaining the channel factor required for the precoding calculation can be carried in the first precoding parameter. For example, the method for obtaining the channel factor is multicast to a group of terminals to reduce the signaling overhead. Alternatively, the method for obtaining the channel factor required for the precoding calculation can also be indicated in other ways without limitation.

Still taking the example of the network device scheduling the first terminal and the second terminal according to MU-MIMO, as shown in Figure 4, S102 may include: the network device sends the second precoding parameter of the first terminal to the first terminal; and sends the second precoding parameter of the second terminal to the second terminal.

As a possible implementation, the network device may determine the second precoding parameters and the first precoding parameters of different terminals according to the desired equivalent channel form, so that the equivalent channel of the network device has sparseness. Exemplarily, the network device may also determine the first precoding parameters and the second precoding parameters of different terminals in combination with the historical CSI of different terminals.

Optional, equivalent channels for network devices satisfy:

W ^H represents the conjugate transposed matrix of W, W represents the receiving matrix of the network device for multiple terminals scheduled by MU-MIMO, H _q represents the uplink channel factor of terminal q among the multiple terminals, represents the transmit precoding matrix of terminal q. For example, FIG5 shows an example of an equivalent channel of a network device. In this example, there are four terminals scheduled by MU-MIMO. It can be seen that the spatial resources occupied by the four terminals are dispersed from each other and arranged sparsely, and the interference between them is reduced.

The sparse equivalent channel includes, but is not limited to, a channel of a triangular structure, a channel of a trapezoidal structure, such as an equivalent channel of a quasi-inverted trapezoid.

S103: The terminal determines a transmit precoding matrix of the terminal according to the first precoding parameter and the second precoding parameter of the terminal.

After receiving the first precoding parameter and the second precoding parameter of the terminal, the terminal sends an uplink signal according to the first precoding parameter and the second precoding parameter.

Still taking the case where the network device schedules the first terminal (such as terminal p) and the second terminal (such as terminal q) according to MU-MIMO as an example, the transmit precoding matrix of terminal p can be recorded as After receiving the first precoding parameter and the second precoding parameter of the terminal p, the terminal p may generate a transmit precoding matrix of the terminal p according to the first precoding parameter and the second precoding parameter. Afterwards, terminal p can use The transmitted uplink signal is spatially shaped. For example, the uplink signal to be transmitted by terminal p is s _p . The spatially shaped transmission signal of terminal p is Similarly, the spatially shaped transmission signal of terminal q is Where, s _q is the uplink signal to be sent by terminal q, is the transmit precoding matrix of terminal q.

Accordingly, the network device receives The spatially shaped received signal y satisfies:

Wherein, H _p is the uplink channel factor of terminal p, H _q is the uplink channel factor of terminal q, and n is white noise. In one or more embodiments of the present application, _NR represents the number of receiving ports, and _Nt represents the number of sending ports.

In the embodiment of the present application, the uplink channel factor of the terminal may also be referred to as the uplink channel matrix of the terminal. Similarly, the effective channel factor of the terminal may be referred to as the effective channel matrix, or effective H, which may be written as The equivalent channel factor of the terminal can be called the equivalent channel matrix, or equivalently H, which can be written as

Compared with the related art, after the terminal determines the uplink candidate precoding matrix by itself, it needs to report to the base station through SRS to determine the precoding matrix to be finally used, resulting in high signaling overhead. In the solution of the embodiment of the present application, the network device indicates the generation parameters of the transmission precoding matrix, and the generation parameters include the first precoding parameter and the second precoding parameter. In this way, the terminal can generate the transmission precoding matrix by itself according to the generation parameters, and can determine the transmission precoding matrix without reporting to the network device for the second time, which can reduce signaling overhead, and has low latency, and can notify the terminal of the codebook more efficiently. This solution can support a large number of terminals to perform uplink transmission at the same time in an overload scenario, thereby improving transmission performance.

An embodiment of the present application also provides a precoding parameter transmission method, and the network device can explicitly indicate the first precoding parameter.

As a possible implementation method, the network device may indicate the information of the receiving matrix through a generation method (also referred to as a quantization method or a compression method or a compression encoding method), data information generated by the generation method (including dimensions, specific data), etc. For example, the network device broadcasts the generation method of the receiving matrix and the data information generated by the generation method, and the terminal generates the receiving matrix by itself according to the generation method and the data information generated by the generation method.

For example, assuming that there are 64 antennas on the receiving side, W is a 64*64 matrix, the compression method is element-by-element quantization transmission, and each matrix element is compressed using 8 bits. In this case, the generation method is element-by-element quantization, the parameters of the generation method are 8 bits, and the dimension information is 64*64. The data information generated by the generation method has a total of 64*64 8-bit data values.

For example, the compression method of W adopts the transform domain compression transmission form, which vectorizes W to form a vector of (64*64)*1, and then transmits it using the transform domain compression scheme. The transform domain can select DFT, and the quantization bit is 8 bits. In this case, the generation method is the transform domain compression scheme, and the parameters of the generation method are DFT domain, 8 bits, and the dimensional information is 64*64. The data information generated by the generation method has a total of 64*64 8-bit data values.

As follows, taking the example that the second precoding parameter includes a generation method of a transmit precoding matrix and a method of obtaining a channel factor, and the first precoding parameter includes a receiving matrix of a network device,

Firstly, the uplink channel factor H _p required for precoding is obtained according to the second precoding parameter.

The transmission space of terminal p among the above multiple terminals Satisfies the following formula 1:

Where N is the total number of paired terminals. For example, MU-MIMO schedules N terminals.

Terminal p can determine its own transmit precoding matrix according to the transmission space V _p as shown in Formula 1: For example, p = 1 or Terminal p can select L column vectors from V _p as For example, the L column vectors above correspond to the first L largest diagonal elements in D _p . For another example, RQ decomposition can obtain:

Terminal p can select L column vectors from V _p as For example, the above L column vectors correspond to the first L largest diagonal elements in R _p , where L is the number of spatial streams and L is a positive integer.

In one or more embodiments of the present application, the transmission space _Vp may also be referred to as a candidate codebook, denoted as _Vtotal .

As shown in the above formula 1, if p=1 (M _p-1 =0), it means that terminal p is the first terminal to be precoded among the multiple terminals. The network device can instruct terminal p to use SVD to determine the transmit precoding matrix of terminal p through the second precoding parameter. (1<M _p-1 +L<N _R ), the network device can instruct terminal p to use orthogonal projection decomposition and W _p-1 to generate its own transmit precoding matrix. (M _p-1 = _NR ), indicating that terminal p is the first terminal to start RQ decomposition, and the network device can instruct terminal p to use RQ decomposition and W to generate its own transmit precoding matrix. Wp _-1 represents the receiving matrix of the network device for terminal p-1, which is the 1st:Mp _-1 column of the first precoding parameter W. Mp _-1 is the number of columns of Wp _-1 , and _NR represents the number of receiving ports. When _Mp-1 corresponds to different values, the generation method of the transmit precoding matrix is different. For example, in the above formula 1, the first precoded terminal (Mp _-1 = 0) is decomposed by SVD, and the middle terminal is decomposed by orthogonal projection. RQ decomposition is used up to the last precoding terminal (M _p-1 = _NR ).

As a possible implementation manner, M _p-1 is sent as the second precoding parameter.

In some examples, if the total number of terminals N is less than Then there will be no terminal performing RQ decomposition, and the terminal will perform SVD decomposition or orthogonal projection decomposition.

In some examples, the terminal order and the decomposition method are not necessarily corresponding. For example, the first terminal can also perform RQ decomposition, and the last terminal can perform SVD decomposition or projection decomposition. Exemplarily, the decomposition method used by the terminal is related to the arrangement order of the terminals when generating the receiving matrix.

As shown in the above formula 1, H _p represents the uplink channel factor of terminal p. Terminal p can measure the downlink channel and determine H _p according to the mutual difference between the uplink and downlink channels, or the network device explicitly or implicitly indicates H _p to terminal p through signaling.

As shown in the above formula 1, corresponding to p=1, U _p is the left singular vector obtained by SVD, which represents the receiving space of the network device. In some examples, a column vector can be selected from the receiving space as the receiving matrix of terminal p. _{V p} is the right singular vector obtained by SVD, which represents the sending space of terminal p. D _p is the unit matrix obtained by SVD, which can enable interference-free transmission between the above multiple terminals.

Corresponds to I is the identity matrix. _{W p-1} represents the receiving matrix of the network device to the terminal p-1. represents the conjugate transposed matrix of W _p-1 . _Ap represents the projection of H _p on the complementary space (or null space) of W _p-1 . [U _p ,D _p ,V _p ]=svd(A _p ), which means determining the transmit precoding matrix and the corresponding receiving space of terminal p in the complementary space. For example, by adopting the orthogonal projection decomposition method, the receiving space and transmit precoding matrix of the second terminal are determined in the complementary space of the receiving space U ₁ corresponding to the first terminal. In the complementary space of the receiving space formed by combining the receiving spaces of the first terminal and the second terminal, the transmit precoding matrix and the corresponding receiving space of the third terminal are determined. By analogy, when terminal p generates its own transmit precoding matrix, it refers to the receiving space of the network device for other terminals (the first p-1 terminals), which can reduce the interference between terminal p and other terminals.

Corresponds to [T _p ,R _p ,V _p ]=rq(WH _p ) represents RQ decomposition. For example, there are 64 antennas, and 64 terminals have obtained 64 transmit precoding matrices. The network device can instruct the 65th terminal to use RQ decomposition to obtain the transmit precoding matrix of the terminal.

It can be seen that when the network device schedules multiple terminals according to MU-MIMO, it can refer to some information of some of the multiple terminals to determine the precoding parameters of terminal p, for example, instructing terminal p to determine the transmit precoding matrix based on the complementary space of the first p-1 terminals. In this way, the network device sends down the corresponding precoding parameters based on the information of multiple terminals, which can disperse the equivalent channels formed between the multiple terminals and the network device, reducing the uplink communication interference between the terminals.

For example, taking TDD system MU-MIMO scheduling UE1-UE4 as an example, UE1 obtains a downlink channel factor through downlink channel measurement, and UE receives a second precoding parameter, which indicates that UE1 is based on the downlink channel factor Determine the uplink channel factor and use the SVD method to determine the transmit precoding matrix. As shown in Figure 6, UE1 can use the above [U ₁ ,D ₁ ,V ₁ ]=svd(H ₁ ) to decompose and obtain UE1's transmit space V ₁ , and calculate UE1's transmit precoding matrix based on V ₁ H ₁ represents the uplink channel factor of UE1. For example, the reciprocity of uplink and downlink channels in a TDD system can be or

Similarly, UE2 receives information about the receiving matrix W of the network device and receives a second precoding parameter, which indicates that UE2 determines the uplink channel factor based on the downlink channel factor and uses the orthogonal projection decomposition method, W and M _p-1 to determine the transmit precoding matrix, and UE2 obtains the downlink channel factor through channel measurement. As shown in FIG6 , UE2 can obtain the uplink channel factor H ₂ based on the uplink and downlink mutual difference of the channel, and then determine W ₁ based on W and M _p-1 , where W ₁ is the 1:M _p-1 column of W. Decompose to get UE2's transmission space V ₂ , and calculate UE2's transmit precoding matrix based on V _{2 H2} represents the uplink channel factor of UE2.

Similarly, as shown in FIG6 , UE3 determines the uplink channel factor based on the downlink channel factor, uses the orthogonal projection decomposition method, and W and M ₂ to determine the transmit precoding matrix UE4 determines the uplink channel factor based on the downlink channel factor and uses RQ decomposition method and W to generate the transmit precoding matrix In this way, different terminals can adopt different transmission precoding matrix generation methods, which can increase the flexibility of precoding. In addition, the equivalent channels between the network device and multiple terminals can be dispersed as much as possible, that is, the equivalent channels have the characteristics of sparseness, which is conducive to the access of the terminal and reduces the interference between the terminals.

It should be noted that Formula 1 may also have other variations, for example, the first terminal uses SVD decomposition, the middle terminal uses RQ decomposition, and the last terminal uses orthogonal projection decomposition. Alternatively, other decomposition methods, such as EVD, or fewer decomposition methods may be introduced. In short, different terminals may use different precoding methods (such as decomposition methods) according to the desired equivalent channel form, and the embodiments of the present application do not limit the specific method (such as formula) for generating the transmit precoding matrix.

Accordingly, corresponding to the transmit precoding matrix of the terminal p, the receiving matrix _Wp of the network device satisfies the following formula 2:

in, [A,B] means merging the columns of matrix A and matrix B. For example, if A is a matrix with 6 rows and 3 columns, and B is a matrix with 6 rows and 1 column, [A,B] means the matrix with 6 rows and 4 columns after the columns are merged. Represents the floor operator.

When p=1 (M _p-1 =0), W _p is a column vector in U _p , for example, a column vector of U _p corresponding to the first L largest diagonal elements in D _p .

(1<M _p-1 +L< _NR ), W _p is calculated based on W _p-1 and Sure. It is the U _p column vector corresponding to the first L largest diagonal elements in D _p , where L is the number of spatial streams and L is a positive integer.

When M _p-1 +L> _NR , W _p = [W _p-1 , ΔW _p-1 ], are the basis vectors corresponding to the complement space of W _p-1 . For example, The reception matrix _Wp of the p-th precoding terminal is the same as the reception matrix Wp _-1 of the p-1th precoding terminal.

It should be noted that the above W _p is generated in the terminal order of 1:N. In other examples, it can also be generated in reverse order, in which case the generation order of W _p is opposite to that of Formula 2. In other examples, it can also be generated in random order, in which case W _p is generated according to the random terminal order of 1:N. Alternatively, W _p is generated in other feasible orders.

When p=N, define W=W _N . It can be seen from Formula 2 that W includes the receiving matrix information of all terminals. The UE can obtain the network device's receiving and processing space information from it.

The embodiment of the present application also provides a precoding parameter transmission method, in which the network device can implicitly indicate a first precoding parameter. In the method, the first precoding parameter is carried in a reference signal sent by the network device to the terminal. FIG. 7 shows an exemplary process of the method. As shown in FIG. 7, the above S101 can be implemented as: S101a, sending a reference signal.

Optional, reference signal sent to the terminal Satisfies the following relationship: W represents a receiving matrix corresponding to the first precoding parameter, and x represents a reference signal configured by the network device for the terminal.

That is, the network device uses W to perform weighted multiplication on the reference signal x, and obtains Network devices use reference signals Carries the information of the receiving matrix W.

Optionally, the reference signal carrying the first precoding parameter includes but is not limited to CSI-RS.

As a possible implementation, the first precoding parameter and the second precoding parameter are used to determine the transmit precoding matrix of the terminal, including: the second precoding parameter and the reference signal sent to the terminal Used to determine the transmit precoding matrix. Terminal p can measure The received signal after the channel is the equivalent channel factor of terminal p Exemplarily, the network device encodes a group of CSI-RS so that the CSI-RS carries information of the receiving matrix W. The terminal p measures the group of CSI-RS to obtain accurate Terminal p can be based on and the second precoding parameter to determine the transmit precoding matrix of the terminal p.

Exemplarily, the transmission space _Vp of terminal p among multiple terminals scheduled by MU-MIMO satisfies the following relationship:

or

in, represents the effective channel factor of terminal p, express The conjugate transposed matrix of , svd() represents svd decomposition, rq() represents RQ decomposition, represents the equivalent channel factor of terminal p, Means: According to posgrp from Take out some row elements from In some examples, the effective channel factor In the equivalent channel factor The position information posgrp, from Select

For example: Terminal p's posgrp＝(p-1)*L+1：p*L； posgrp = 1: _NR . For another example, the characteristic of RQ decomposition can be used to directly specify posgrp = _NR - _Nt : _NR .

Optional, satisfy: It means that the first L columns of V _p are taken as The L columns correspond to the first L largest diagonal elements in D _p .

Optionally, when using RQ decomposition, the first L columns can be selected from _Vp as The L columns correspond to the first L largest diagonal elements in R _p .

Alternatively, in one or more embodiments of the present application, other methods may be used to determine For example, the network device can send an instruction message to instruct the terminal to determine from V _p way.

Any formula in one or more embodiments of the present application may also have other variations, such as introducing other decomposition methods, or using fewer decomposition methods.

For example, the MU-MIMO terminals scheduled by the network device include UE1 and UE2. As shown in FIG8 , for UE1, the reference signal sent by the network device to UE1 is The signal reaches UE1 through the channel between UE1 and the network device. The signal received by UE1 is y1, which satisfies: Using channel reciprocity Sure is the equivalent uplink channel factor between UE1 and the network device. UE1 can measure y1. According to the formula of y1, UE1 can calculate the equivalent channel factor based on the measured y1 and the configured known x. Furthermore, the second precoding parameter received by UE1 indicates the position information posgrp1 of the effective channel factor of UE1 in the equivalent channel factor of UE1, and indicates that UE1 uses SVD to generate the transmit precoding matrix of UE1. Then, UE1 can obtain the equivalent channel factor according to the position information posgrp1. The corresponding elements are taken out from the effective channel factor H _{1_eff} . Then, UE1 can use the above Calculate the transmit precoding matrix of UE1

Similarly, for UE2, UE2 measures y2 and calculates the equivalent channel factor of UE2 based on the measured y1 and the known x. Afterwards, the UE can calculate the equivalent channel factor and posgrp2 to calculate the effective channel factor H _{2_eff} , and the above Calculate the transmit precoding matrix of UE2

Optionally, in one or more embodiments of the present application, the network device may further send resource configuration information of the reference signal, and the resource configuration information includes at least one of the following information: the number of ports of the reference signal, the duration for which the terminal needs to measure the reference signal, and the number of reference signals that the terminal needs to measure. The number of ports indicated by the resource configuration information is the same as at least one of the following: the number of antennas, the number of ports, and the number of beams of the network device. In other words, reference signals of multiple ports need to be configured to match and obtain a complete W. Since W is a matrix of _NR * _NR , in order for the terminal to measure the information of all antennas or ports of the network device, the reference signal x needs to be a matrix or vector of _NR rows, that is, the number of ports of the reference signal is _NR .

It should be noted that the frequency domain bandwidth of the configured x signal must at least cover the frequency domain bandwidth of the scheduled PUSCH. It can be that one signal covers the entire bandwidth; or the reference signal is divided into several sub-signals, each of which covers part of the bandwidth, but the set of bandwidths covered by each sub-signal includes the frequency domain bandwidth of the scheduled PUSCH.

The solution of the embodiment of the present application is obtained by measuring the reference signal This can avoid the performance loss caused by the quantized receiving matrix W and improve the codebook accuracy. Send uplink signal, and the network device uses W corresponding to multiple terminals to receive uplink signal, and the equivalent channel received by the network device It is sparse, such as showing a regular inverted trapezoidal shape. If the total number of spatial streams of multiple terminals is less than the number of antennas of the network device, the equivalent channel It presents an upper triangle array. Equivalent channel The sparse form of indicates that the interference between multiple terminals is small, and the network equipment is based on this Receiving uplink signals from multiple terminals can significantly improve the transmission quality of multiple terminals, especially when the total number of spatial streams of multiple terminals is greater than the number of antennas of network devices. In this overload scenario, the interference between multiple terminals is small.

An embodiment of the present application also provides a precoding parameter transmission method, and a terminal can perform precoding based on a certain resource granularity. The second precoding parameters include m third precoding parameters: the m third precoding parameters correspond to j time-frequency resources of the terminal, j is a positive integer, and m is a positive integer less than or equal to j; and/or the first precoding parameters include i fourth precoding parameters, the i fourth precoding parameters correspond to l time-frequency resources of the terminal, l is a positive integer, and i is a positive integer less than or equal to l. Exemplarily, the same second precoding parameters exist in the second precoding parameters corresponding to multiple time-frequency resources, or the second precoding parameters corresponding to multiple time-frequency resources are different.

As follows, the precoding resource granularity is a subband as an example for explanation. For example, as shown in FIG9 , UE1 occupies subband 1 to subband 3, and UE2 occupies subband 2 to subband 4. UE1 and UE2 perform space division multiplexing transmission on the shared subband 2 to subband 3.

As shown in FIG9 , the above S101 may be implemented as follows: S101c, the network device broadcasts or multicasts the first precoding parameters corresponding to subbands 1 to 4, such as the network device receiving matrix W ₁ corresponding to subband 1, receiving matrix W ₂ corresponding to subband 2, receiving matrix W ₃ corresponding to subband 3, and receiving matrix W ₄ corresponding to subband 4. Alternatively, the network device sends reference signals corresponding to subbands 1 to 4.

As a possible implementation manner, the network device calculates the first precoding parameter (such as a receiving matrix) corresponding to each subband according to the uplink channel factor corresponding to each subband and the expected equivalent channel on the receiving side.

As a possible implementation method, the network device calculates the first precoding parameter (such as a receiving matrix) corresponding to each subband according to the uplink channel factor corresponding to each subband, the expected equivalent channel on the receiving side, and the precoding order of multiple terminals scheduled by MU-MIMO.

As shown in FIG9 , the above S102 can be implemented as follows: S102a, the network device sends the second precoding parameter corresponding to UE1 in subband 1-subband 3 to UE1; S102b, the network device sends the second precoding parameter corresponding to UE2 in subband 2-subband 4 to UE2.

Take UE1 generating a transmit precoding matrix as an example, as shown in Figure 9, UE1 receives the reference signals corresponding to subbands 1-4 multicast by the network device, and UE1 also receives the second precoding parameter, which instructs UE1 to generate the transmit precoding matrix corresponding to subbands 1-3 using the SVD method, and the position information of the effective channel factors corresponding to subbands 1-3 are posgrp _{1_1} , posgrp _{2_1} , posgrp _{3_1} , posgrp _{4_1} respectively. Then, UE1 can measure the reference signals corresponding to each subband, determine the equivalent channel factors corresponding to each subband, and use the SVD method according to the instructions of the network device. Decompose and generate the transmit precoding matrix corresponding to UE1 in subband 1 Wherein, H _{1_1_eff} represents the effective channel factor corresponding to UE1 in subband 1. Similarly, UE1 can generate a transmit precoding matrix corresponding to UE1 in subband 2-subband 3.

Afterwards, UE1 uses different transmit precoding matrices to spatially shape the transmitted signals of different subbands. As shown in Figure 9, UE1 transmits signal in, represents the transmit precoding matrix corresponding to UE1 in subband 1, s _{1_1} represents the transmit signal of UE1 in subband 1, Indicates the use of The transmitted signal after spatial shaping of s _{1_1} . Indicates that UE1 adopts After spatial shaping of s _{2_1} , the transmitted signal in subband 2 is: Indicates that UE1 adopts The transmitted signal in subband 3 is obtained after spatial shaping of s _{3_1} .

For another example, UE2 receives the reference signals corresponding to subbands 1-4 multicast by the network device. UE2 also receives a second precoding parameter, which indicates that UE2 uses the SVD method to generate the transmit precoding matrix corresponding to subband 2, and also indicates the position information posgrp of the effective channel factor of UE2 in subband 2; the second precoding parameter also indicates that the transmit precoding matrix corresponding to subband 3-subband 4 is generated using the orthogonal projection decomposition method, and also indicates the position information posgrp of the effective channel factor of UE2 in subband 3 and subband 4. UE2 can generate the transmit precoding matrix of UE2 on the corresponding subband based on the measurement result of the reference signal and the second precoding parameter. Exemplarily, the network device can send down multiple parameters to indicate the precoding parameters corresponding to multiple subbands respectively.

The above scheme of the embodiment of the present application can be precoded according to a certain resource granularity (such as subband), and resources of different granularities can have different precoding parameters (such as receiving matrix, decomposition method). For example, the first precoding parameter and the second precoding parameter corresponding to different subbands can be independently configured, so that the precoding parameter transmission method is more flexible and more conducive to reducing interference between multiple terminals.

In the above, the resource granularity (level) is taken as a subband as an example. In other embodiments, the resource granularity may also be other frequency domain granularities, such as subcarrier granularity, or time domain granularity, which is not limited in the embodiments of the present application.

The embodiment of the present application further provides a method for transmitting precoding parameters, and the precoding orders of the above-mentioned multiple terminals on different time-frequency resources can be different to reduce interference between the terminals.

As a possible implementation, the precoding order of multiple terminals scheduled by MU-MIMO can be defined, such as [1,2,3,4], which means that the transmit precoding matrix of terminal 1 is generated first, followed by terminal 2 generating its own transmit precoding matrix, followed by terminal 3 generating its own transmit precoding matrix, and then terminal 4 generating its own transmit precoding matrix. For another example, the precoding order is [2,3,4,1], which means that the order of generating the transmit precoding matrix is: terminal 2, terminal 3, terminal 4, terminal 1.

As a possible implementation manner, the network device sends a mapping pattern, where the mapping pattern is used to indicate the precoding order of the above-mentioned terminal on M time-frequency resources, where M is a positive integer.

Taking the scheduling of UE1-UE3 by the network device as an example, as shown in Figure 10, the network device sends the mapping pattern corresponding to UE1-UE3 in RBG1-RBGm to indicate the precoding order of the three UEs in each RBG. For example, in RBG1, the precoding order of the three UEs is UE1-UE2-UE3, that is, UE1 is precoded first, then UE2, and then UE3. In RBG2, the precoding order of the three UEs is UE3-UE2-UE1, and so on.

Exemplarily, the mapping pattern can be represented by bits. For example, in FIG10 , the mapping pattern is 000 001 000…100, and every three bits represent the precoding order on the corresponding RBG. The mapping pattern indicates that the precoding order of UE1-UE3 on RBG1 is UE1-UE2-UE3, and the precoding order on RBG2 is UE3-UE2-UE1, and so on. Of course, other methods can also be used to indicate the mapping pattern.

In the above scheme provided in the embodiment of the present application, the interference received by terminal p is related to the precoding order of terminal p in the above-mentioned multiple terminals. The earlier the precoding order of terminal p is, the less interference it receives from other terminals, and the higher the signal to interference plus noise ratio (SINR). Conversely, the later the precoding order of terminal p is, the more interference it receives from other terminals, and the lower the SINR. Therefore, in the embodiment of the present application, the precoding order of the above-mentioned multiple terminals on different resources can be changed to reduce the probability and possibility that the terminal is always in a low SINR, so that the average SINR of the above-mentioned multiple terminals on multiple resources converges, thereby improving the average detection performance of the multiple terminals.

The embodiment of the present application also provides a precoding parameter transmission method, and the network device can send down corresponding precoding parameters according to the precoding order of the above-mentioned multiple terminals on multiple resources to reduce the signaling overhead caused by sending down the precoding parameters.

As a possible implementation method, taking into account that the precoding order of the terminal affects the precoding performance of the terminal, such as SINR, as a possible implementation method, the second precoding parameters corresponding to multiple terminals on multiple time-frequency resources with the same precoding order are the same, so that the precoding performance of multiple terminals on the multiple time-frequency resources remains stable.

Still as shown in Figure 10, the precoding order of UE1-UE3 in RBG1 and RBG3 is the same, all of which are to precode UE1 first, then precode UE2, and then precode UE3. In RBG1, the position information of UE1's effective channel factor in the equivalent channel factor is posgrp1, and the precoding method is SVD. Then, in RBG3, the position information of UE1's effective channel factor in the equivalent channel factor is also posgrp1, and the precoding method is also SVD. Similarly, the second precoding parameters corresponding to UE2 in RBG1 and RBG3 are consistent. The second precoding parameters corresponding to UE3 in RBG1 and RBG3 are consistent. In this way, the precoding order of UE1-UE3 on RBG1 and RBG3 is the same, and the second precoding parameters of UE1-UE3 on RBG1 and RBG3 are the same, which can make the overall precoding performance of UE1-UE3 in RBG1 and RBG3 similar.

As a possible implementation method, M time-frequency resources include j time-frequency resources; the second precoding parameter includes: the second precoding parameter corresponding to the terminal in j time-frequency resources; the precoding order of the terminal in j time-frequency resources is different.

The M time-frequency resources include time-frequency resource n; the second precoding parameter does not include the second precoding parameter of the terminal in time-frequency resource n; the precoding order of the terminal in time-frequency resource n is the same as the precoding order of the terminal in at least one time-frequency resource among the j time-frequency resources. When the precoding order of multiple terminals in multiple time-frequency resources is the same, the exclusive precoding parameters corresponding to the multiple time-frequency resources of the multiple terminals are the same.

That is to say, if the precoding order of the multiple terminals on the multiple time-frequency resources is the same, the network device may only send the second precoding parameter corresponding to one time-frequency resource among the multiple time-frequency resources to reduce signaling overhead.

Still as shown in Figure 10, the network device schedules UE1-UE3, and the precoding order of UE1-UE3 on RBG1, RBG2, RBG4...RBGm is different, and the precoding order of UE1-UE3 on RBG1 and RBG3 is the same, then the network device can send the second precoding parameters of UE1-UE3 on RBG1, RBG2, RBG4...RBGm, and does not send the second precoding parameters of UE1-UE3 on RBG3. UE1-UE3 can reuse the second precoding parameters on RBG1 on RBG3. For example, UE1 receives the second precoding parameter corresponding to UE1 on RBG1, and the second precoding parameter indicates that the position information of UE1's effective channel factor in the equivalent channel factor is posgrp1, and the precoding method is SVD. Furthermore, UE1 learns from the above mapping pattern that the precoding order of UE1-UE3 on RBG1 and RBG3 is the same, and UE1 also generates a transmit precoding matrix corresponding to RBG3 on RBG3 according to posgrp1, SVD and the reference signal carrying the first precoding parameter.

According to the solution of the embodiment of the present application, the network device does not need to send the second precoding parameter corresponding to each RBG to the terminal, but no longer repeatedly sends the same second precoding parameter according to the precoding order of multiple terminals on different time-frequency resources. For example, for RBG1 and RBG3 shown in Figure 10, the network device only sends the second precoding parameter corresponding to UE1-UE3 in RBG1, and no longer sends the second precoding parameter corresponding to UE1-UE3 in RBG3, thereby reducing signaling overhead.

The embodiment of the present application also provides a precoding parameter transmission method, in which a network device sends association information between a first precoding parameter and a time-frequency resource and association information between a second precoding parameter and a time-frequency resource, so that the terminal determines the second precoding parameter and the first precoding parameter used to generate a transmit precoding matrix based on the association relationship. The association information between the first precoding parameter and the time-frequency resource can be understood as: the association information between the first precoding parameter and the uplink time-frequency resource (such as PUSCH). Similarly, the association information between the second precoding parameter and the time-frequency resource can be understood as: the association information between the second precoding parameter and the uplink time-frequency resource.

For example, as shown in Figure 11, at time t1, the network device sends the association relationship between the receiving matrix W and the PUSCH time-frequency resources, such as instructing the terminal at time T to use W sent at time T-(t4-t2) as the receiving matrix for determining the transmit precoding matrix. t4-t2 is a time interval. T can be called the precoding time. At time t1, the network device also sends the association relationship between the decomposition method and the time-frequency resources, such as instructing the terminal at time T to use the decomposition method sent at time T-(t4-t3) as the decomposition method for determining the transmit precoding matrix. At time t2, the terminal receives the information of the receiving matrix W1 indicated by the network device, and at time t3, the terminal receives the information of the decomposition method indicated by the network device.

In some examples, at time t3, the terminal determines the transmit precoding matrix used at time t4 based on the association relationship sent by the network device at time t1, the decomposition method information received at time t3, and the receiving matrix W1 information received at time t2.

In some examples, at time t4, the terminal determines that it needs to determine the transmit precoding matrix based on the receive matrix received at time t4-(t4-t2) and the decomposition method received at time t4-(t4-t3) according to the association relationship sent by the network device at time t1. That is, the transmit precoding matrix is generated based on the receive matrix W1 received at time t2 and the decomposition method (SVD) received at time t3.

For another example, as shown in Figure 12, at time t1, the network device sends the association relationship between CSI-RS and time-frequency resources, as well as the relationship between the decomposition method and the time-frequency resources, such as instructing the terminal to determine the transmit precoding matrix at time T based on the measurement result of the CSI-RS received at time T-(t4-t2) and in combination with the decomposition method received at time T-(t4-t3). At time t2, the terminal measures the CSI-RS received at time t2. At time t3, the terminal determines the transmit precoding matrix based on the association relationship sent by the network device at time t1, in combination with the decomposition method received at time t3 and the measurement result of the CSI-RS received at time t2.

The scheme of the embodiment of the present application can associate the first precoding parameter with the second precoding parameter through the association information between the first precoding parameter and the time-frequency resource and the association information between the second precoding parameter and the time-frequency resource, so that the terminal can determine the first precoding parameter and the associated second precoding parameter required for precoding at time T, and perform precoding accordingly. The terminal generates a transmit precoding matrix by itself, avoiding the loss of quantization accuracy caused by the network device directly sending the transmit precoding matrix.

Optionally, the network device may send the above-mentioned association information via a UL grant message. Alternatively, the above-mentioned association information may also be sent via other messages (such as DCI), which is not limited in the embodiments of the present application.

Optionally, the network device may unicast the above association relationship to the terminal. Alternatively, the network device may broadcast or multicast the above association relationship, and the association relationship may be used for a group of terminals. Thereafter, the network device may unicast the association relationship used by a single terminal. For example, the network device multicasts the following common information group table 1:

Table 1

Afterwards, the network device may indicate to the terminal the index of the association relationship in Table 1, so as to indicate to the terminal to determine the transmit precoding matrix using the first precoding parameter and the second precoding parameter corresponding to the association relationship. For example, the time interval between the moment of receiving W and the precoding moment is indicated to terminal 1 as t4-t2, and the time interval between the moment of receiving W and the precoding moment is indicated to terminal 2 as t4-ta.

It should be noted that Table 1 is only an example. In other embodiments, the association relationship of the network device multicast can also be in other formats. For example, Table 1 can be divided into two sub-tables, one sub-table indicating the association information between W and time-frequency resources, and the association information between the decomposition method and the time-frequency resources, and the other sub-table indicating the association information between CSI-RS and time-frequency resources, and the association information between the decomposition method and the time-frequency resources.

In the above, taking the time interval as an example, the terminal can determine the time domain resources occupied by the precoding parameters required for precoding. In other embodiments, the network device can also associate the precoding parameters (first precoding parameters and second precoding parameters) with the corresponding frequency domain resources, and send down the association information so that the terminal can determine the transmit precoding matrix based on the association information using the precoding parameters received in the corresponding frequency domain resources. Another example is the time-frequency interval relationship.

In one or more embodiments of the present application, the network device may also send at least one of the following information: a carrying method for a first precoding parameter, a time-frequency resource for a first precoding parameter, a number of first precoding parameters, a dimension of a first precoding parameter, a resource granularity for a first precoding parameter, a quantization method for a first precoding parameter, and a quantization accuracy for a first precoding parameter; time-frequency resources for a second precoding parameter, a resource granularity for a second precoding parameter, a number of second precoding parameters, a number of transmit precoding matrices, and uplink time-frequency resources (such as PUSCH resources) corresponding to each transmit precoding matrix.

The first precoding parameter carrying mode includes an explicit carrying mode or an implicit carrying mode. When the first precoding parameter is carried in an implicit manner, the time-frequency resource of the first precoding parameter includes: a resource of a reference signal carrying the first precoding parameter. Exemplarily, when the first precoding parameter is carried in an explicit manner, the network device needs to send at least one of the following information to the terminal: a quantization method of the first precoding parameter, a quantization accuracy, and a number of the first precoding parameters.

The resource granularity of the first precoding parameter may also be referred to as the scope of action of the first precoding parameter. Exemplarily, the resource granularity of the first precoding parameter is a subband, and the network device sends the first precoding parameters corresponding to different subbands according to the subband granularity. Similarly, the second precoding parameter may be sent at different granularities.

Optionally, the number of first precoding parameters is associated with resource granularity. And/or, the number of second precoding parameters is associated with resource granularity. For example, five subbands correspond to five first precoding parameters.

The uplink time-frequency resources corresponding to the transmit precoding matrix can be understood as: the uplink resources occupied by the uplink signal shaped by the transmit precoding matrix.

Optionally, the network device may also send an effective indication message to indicate whether to use the corresponding transmit precoding matrix for spatial shaping. For example, when the effective indication message is 0, it is used to indicate that the terminal does not send an uplink signal shaped by the corresponding transmit precoding matrix (such as matrix A) on the corresponding PUSCH time-frequency resource. When the effective indication message is 1, it is used to indicate that the terminal sends an uplink signal shaped by the corresponding transmit precoding matrix (such as matrix B) on the corresponding PUSCH time-frequency resource.

The precoding method for determining a transmit precoding matrix using a first precoding parameter and a second precoding parameter provided in an embodiment of the present application may be referred to as a non-orthogonal coding method.

In one or more embodiments of the present application, the network device may also send indication information, the indication information is used to instruct the terminal to use the first precoding parameter and the second precoding parameter to determine the transmit precoding matrix, that is, to instruct to use the non-orthogonal coding method for precoding. The indication information may also be called enabling information or other names, which are not limited in the embodiments of the present application.

In one or more embodiments of the present application, the M time-frequency resources are resources used by the terminal for multiple transmissions, or are resources used by the terminal for one transmission. For example, as shown in FIG10 , RBG1-RBGm are resources used by UE1-UE3 for one transmission. Alternatively, RBG1-RBGm are resources used by UE1-UE3 for multiple transmissions.

Exemplarily, in each transmission of the terminal, there may be a different transmit precoding matrix, and the transmit precoding matrix of the terminal is associated with the receive matrix W of the network device. Exemplarily, K transmissions may be associated with K different Ws. Alternatively, K transmissions may be associated with K identical Ws and K different second precoding parameters.

The above takes broadcasting or multicasting the first precoding parameter as an example. In other embodiments, the network device may also unicast the first precoding parameter. The present application embodiment does not limit this, as long as the first precoding parameter can be sent to the terminal for determining the transmit precoding matrix in conjunction with the second precoding parameter.

In some other embodiments, the network device may receive a different matrix W for a group of terminals scheduled by MU-MIMO. Taking MU-MIMO scheduling of four terminals as an example, the network device is composed of Combined with certain criteria, such as the MMSE criterion, determine the receiving matrix of the network device for terminal i This method, due to the The transmission space between the terminals has been adjusted to a low-interference (quasi-sparse) spatial direction, so that the interference between the terminals is low.

The above mainly takes the first precoding parameter and the second precoding parameter as examples. With the evolution of technology and scenarios, the precoding parameters can be replaced with parameters adapted to the subsequent evolution scenarios. The network device multicasts or broadcasts some precoding parameters to multiple terminals and unicasts some precoding parameters to multiple terminals. The embodiments of the present application do not limit the types of specific precoding parameters for multicast (or broadcast) and unicast.

It should be noted that the above-mentioned multiple embodiments can be combined and the combined scheme can be implemented. Optionally, some operations in the process of each method embodiment are optionally combined, and/or the order of some operations is optionally changed. In addition, the execution order between the steps of each process is only exemplary and does not constitute a limitation on the execution order between the steps. There can also be other execution orders between the steps. It is not intended to indicate that the execution order is the only order in which these operations can be performed. Ordinary technicians in this field will think of many ways to reorder the operations of this article. In addition, it should be pointed out that the process details involved in a certain embodiment of this article are also applicable to other embodiments in a similar manner, or different embodiments can be used in combination.

In addition, some steps in the method embodiment may be equivalently replaced by other possible steps. Alternatively, some steps in the method embodiment may be optional and may be deleted in certain usage scenarios. Alternatively, other possible steps may be added in the method embodiment. Alternatively, the execution subject (such as a functional module) of some steps in the method embodiment may be replaced by other execution subjects.

Furthermore, the above method embodiments may be implemented separately or in combination.

Some other embodiments of the present application provide a device, which may be the above-mentioned network device, terminal, etc. The device may include: a memory and one or more processors. The memory is coupled to the processor. The memory is used to store computer program code, and the computer program code includes computer instructions. When the processor executes the computer instructions, the device may perform various functions or steps in the above-mentioned method embodiment. The structure of the device can refer to the communication device shown in Figure 3.

The core structure of the device can be represented as the structure shown in FIG. 13 , and the device includes: a processing module 2301 , a storage module 2303 and a communication module 2305 .

The processing module 2301 may include at least one of a central processing unit (CPU), an application processor (AP) or a communication processor (CP). The processing module 2301 may perform operations or data processing related to the control and/or communication of at least one of the other elements of the communication device. Specifically, the processing module 2301 may be used to control the content displayed on the main screen according to certain trigger conditions. The processing module 2301 is also used to process input instructions or data and determine the display style according to the processed data.

The storage module 2303 may include a volatile memory and/or a non-volatile memory. The storage module is used to store at least one instruction or data related to other modules of the user equipment device.

Optionally, a communication module 2305 is also included to support personal devices (via a communication network) to communicate with other personal devices. For example, the communication module can be connected to a network via wireless communication or wired communication to communicate with other personal devices or network servers. Wireless communication can use at least one of cellular communication protocols, such as long-term evolution (LTE), advanced long-term evolution (LTE-A), code division multiple access (CDMA), wideband code division multiple access (WCDMA), universal mobile telecommunications system (UMTS), wireless broadband (WiBro) or global mobile communication system (GSM). Wireless communication may include, for example, short-range communication. Short-range communication may include at least one of wireless fidelity (Wi-Fi), Bluetooth, near field communication (NFC), magnetic stripe transmission (MST) or GNSS.

It should be noted that each functional module of the device can execute one or more steps in the above method embodiment.

The embodiment of the present application also provides a chip system, as shown in Figure 14, the chip system includes at least one processor 1401 and at least one interface circuit 1402. The processor 1401 and the interface circuit 1402 can be interconnected through lines. For example, the interface circuit 1402 can be used to receive signals from other devices (such as the memory of the communication device). For another example, the interface circuit 1402 can be used to send signals to other devices (such as the processor 1401). Exemplarily, the interface circuit 1402 can read the instructions stored in the memory and send the instructions to the processor 1401. When the instruction is executed by the processor 1401, the communication device can perform the various steps in the above embodiments. Of course, the chip system can also include other discrete devices, which is not specifically limited in the embodiment of the present application.

An embodiment of the present application also provides a computer-readable storage medium, which includes computer instructions. When the computer instructions are executed on the above-mentioned communication device, the communication device executes each function or step in the above-mentioned method embodiment.

The embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, the computer executes each function or step executed by the mobile phone in the above method embodiment.

Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

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

The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

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

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

The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (62)

A precoding parameter transmission method, characterized by comprising: broadcast or multicast a first precoding parameter; A second precoding parameter is sent, where the first precoding parameter and the second precoding parameter are used to determine a transmit precoding matrix of a terminal. The method according to claim 1 is characterized in that the first precoding parameter is used to indicate spatial information of an uplink between the terminal and a network device. The method according to claim 1 or 2 is characterized in that the first precoding parameter includes at least one of the following: information of a receiving matrix for receiving uplink signals by a network device, information of a receiving beam for receiving the uplink signals by the network device, information of an antenna panel for receiving the uplink signals by the network device, and information of a port for receiving the uplink signals by the network device. The method according to any one of claims 1-3 is characterized in that the first precoding parameter is carried in a reference signal sent to the terminal. The method according to claim 4, characterized in that the reference signal sent to the terminal Satisfies the following relationship: The W represents a receiving matrix corresponding to the first precoding parameter, and the x represents a reference signal configured for the terminal. The method according to any one of claims 1 to 5, characterized in that the second precoding parameter includes m third precoding parameters: the m third precoding parameters correspond to j time-frequency resources of the terminal, j is a positive integer, and m is a positive integer less than or equal to j; The first precoding parameter includes i fourth precoding parameters, and the i fourth precoding parameters correspond to l time-frequency resources of the terminal, where l is a positive integer and i is a positive integer less than or equal to l. The method according to any one of claims 1 to 6, further comprising: Sending association information between the first precoding parameter and the time-frequency resource and association information between the second precoding parameter and the time-frequency resource. The method according to claim 4 or 5 is characterized in that the first precoding parameter and the second precoding parameter are used to determine the transmit precoding matrix of the terminal, including: the second precoding parameter and the reference signal sent to the terminal are used to determine the transmit precoding matrix. The method according to any one of claims 1 to 8, further comprising: A mapping pattern is sent, where the mapping pattern is used to indicate a precoding order of the terminal on M time-frequency resources, where M is a positive integer. The method according to claim 9 is characterized in that the M time-frequency resources include j time-frequency resources; the second precoding parameters include: the second precoding parameters corresponding to the j time-frequency resources of the terminal; the precoding orders of the j time-frequency resources of the terminal are different. The method according to claim 10 or 9 is characterized in that the M time-frequency resources include time-frequency resource n; the second precoding parameter does not include the second precoding parameter of the terminal in the time-frequency resource n; the precoding order of the terminal in the time-frequency resource n is the same as the precoding order of at least one time-frequency resource among the j time-frequency resources. The method according to claim 4 or 5, characterized in that it also includes: Resource configuration information for sending the reference signal, wherein the number of ports indicated by the resource configuration information is the same as at least one of the following: the number of antennas and the number of beams of the network device. The method according to any one of claims 9 to 11 is characterized in that the M time-frequency resources are resources used by the terminal for multiple transmissions, or are resources used by the terminal for one transmission. The method according to any one of claims 1 to 13, further comprising: Send at least one of the following information: a carrying mode of the first precoding parameter, a time-frequency resource of the first precoding parameter, the number of the first precoding parameters, the dimension of the first precoding parameter, the resource granularity of the first precoding parameter, the quantization method of the first precoding parameter, the quantization accuracy of the first precoding parameter; the resource granularity of the second precoding parameter, and the number of the transmit precoding matrices; The time-frequency resources of the first precoding parameter include: resources of a reference signal carrying the first precoding parameter. The method according to any one of claims 1 to 14, further comprising: Sending indication information, where the indication information is used to instruct the terminal to use the first precoding parameter and the second precoding parameter to determine the transmit precoding matrix. The method according to any one of claims 1-15 is characterized in that the second precoding parameter includes at least one of the following: position information of the effective channel factor of the terminal in the equivalent channel factor, and a generation method of the transmit precoding matrix. A coding method, characterized by comprising: Receiving a first precoding parameter broadcast or multicast by a network device; receiving a second precoding parameter; A transmit precoding matrix is determined according to the first precoding parameter and the second precoding parameter. The method according to claim 17 is characterized in that the first precoding parameter is used to indicate spatial information of an uplink between the terminal and a network device. The method according to claim 18 or 17 is characterized in that the first precoding parameter includes at least one of the following: information of a receiving matrix for receiving uplink signals by the network device, information of a receiving beam for receiving the uplink signals by the network device, information of an antenna panel for receiving the uplink signals by the network device, and information of a port for receiving the uplink signals by the network device. The method according to any one of claims 17-19 is characterized in that the first precoding parameter is carried in a reference signal sent by a network device to the terminal. The method according to claim 20, further comprising: measuring the reference signal; Determining a transmit precoding matrix according to the first precoding parameter and the second precoding parameter includes: The transmit precoding matrix is determined according to the measurement result of the reference signal, the first precoding parameter and the second precoding parameter. The method according to any one of claims 17 to 21, characterized in that the second precoding parameter includes m third precoding parameters: the m third precoding parameters correspond to j time-frequency resources of the terminal, j is a positive integer, and m is a positive integer less than or equal to j; The first precoding parameter includes i fourth precoding parameters, and the i fourth precoding parameters correspond to l time-frequency resources of the terminal, where l is a positive integer and i is a positive integer less than or equal to l. The method according to any one of claims 17 to 22, further comprising: The association information between the first precoding parameter and the time-frequency resource and the association information between the second precoding parameter and the time-frequency resource are received. The method according to claim 23, further comprising: Determining the first precoding parameter according to association information between the first precoding parameter and the time-frequency resource; The second precoding parameter is determined according to association information between the second precoding parameter and the time-frequency resource. The method according to any one of claims 17 to 24, further comprising: A mapping pattern is received, where the mapping pattern is used to indicate a precoding order of the terminal on M time-frequency resources, where M is a positive integer. The method according to claim 25 is characterized in that the M time-frequency resources include j time-frequency resources; the second precoding parameters include: the second precoding parameters corresponding to the j time-frequency resources of the terminal; the precoding orders of the terminal in the j time-frequency resources are different. The method according to claim 21 or 20, characterized in that it also includes: Receive resource configuration information of the reference signal, where the number of ports indicated by the resource configuration information is the same as at least one of the following: the number of antennas and the number of beams of the network device. The method according to any one of claims 17 to 27, further comprising: Receive at least one of the following information: a carrying mode of the first precoding parameter, a time-frequency resource of the first precoding parameter, the number of the first precoding parameters, the dimension of the first precoding parameter, the resource granularity of the first precoding parameter, the quantization method of the first precoding parameter, the quantization accuracy of the first precoding parameter; the resource granularity of the second precoding parameter, and the number of the transmit precoding matrices; The time-frequency resources of the first precoding parameter include: resources of a reference signal carrying the first precoding parameter. The method according to any one of claims 17-28 is characterized in that the second precoding parameter includes at least one of the following: position information of the effective channel factor of the terminal in the equivalent channel factor, and a generation method of the transmit precoding matrix. A communication device, characterized in that it comprises: a processing module and a transceiver module; The processing module is used to generate a first precoding parameter and a second precoding parameter, wherein the first precoding parameter and the second precoding parameter are used to determine a transmit precoding matrix of a terminal; The transceiver module broadcasts or multicasts the first precoding parameter by a user; The transceiver module is further used to send the second precoding parameter. The apparatus according to claim 30 is characterized in that the first precoding parameter is used to indicate spatial information of an uplink between the terminal and a network device. The device according to claim 30 or 31 is characterized in that the first precoding parameter includes at least one of the following: information on a receiving matrix of a network device for receiving an uplink signal, information on a receiving beam of a network device for receiving the uplink signal, information on an antenna panel of a network device for receiving the uplink signal, and information on a port of a network device for receiving the uplink signal. The device according to any one of claims 30-32 is characterized in that the first precoding parameter is carried in a reference signal sent to the terminal. The device according to claim 33, characterized in that the reference signal sent to the terminal Satisfies the following relationship: The W represents a receiving matrix corresponding to the first precoding parameter, and the x represents a reference signal configured for the terminal. The device according to any one of claims 30 to 34, characterized in that the second precoding parameter includes m third precoding parameters: the m third precoding parameters correspond to j time-frequency resources of the terminal, j is a positive integer, and m is a positive integer less than or equal to j; The first precoding parameter includes i fourth precoding parameters, and the i fourth precoding parameters correspond to l time-frequency resources of the terminal, where l is a positive integer and i is a positive integer less than or equal to l. The device according to any one of claims 30 to 35, characterized in that The transceiver module is further used to send association information between the first precoding parameter and the time-frequency resource and association information between the second precoding parameter and the time-frequency resource. The device according to claim 33 or 34 is characterized in that the first precoding parameter and the second precoding parameter are used to determine the transmit precoding matrix of the terminal, including: the second precoding parameter and the reference signal sent to the terminal are used to determine the transmit precoding matrix. The device according to any one of claims 30 to 37, characterized in that The transceiver module is further used to send a mapping pattern, where the mapping pattern is used to indicate the precoding order of the terminal on M time-frequency resources, where M is a positive integer. The device according to claim 38 is characterized in that the M time-frequency resources include j time-frequency resources; the second precoding parameters include: the second precoding parameters corresponding to the j time-frequency resources of the terminal; the precoding orders of the terminal in the j time-frequency resources are different. The device according to claim 38 or 39 is characterized in that the M time-frequency resources include time-frequency resource n; the second precoding parameter does not include the second precoding parameter of the terminal in the time-frequency resource n; the precoding order of the terminal in the time-frequency resource n is the same as the precoding order of at least one time-frequency resource among the j time-frequency resources. The device according to claim 33 or 34, characterized in that The transceiver module is further used to send resource configuration information of the reference signal, and the number of ports indicated by the resource configuration information is the same as at least one of the following: the number of antennas and the number of beams of the network device. The device according to any one of claims 38-40 is characterized in that the M time-frequency resources are resources used by the terminal for multiple transmissions, or are resources used by the terminal for one transmission. The device according to any one of claims 30 to 42, characterized in that The transceiver module is further used to send at least one of the following information: a carrying mode of the first precoding parameter, a time-frequency resource of the first precoding parameter, the number of the first precoding parameter, the dimension of the first precoding parameter, the resource granularity of the first precoding parameter, the quantization device of the first precoding parameter, and the quantization accuracy of the first precoding parameter; the resource granularity of the second precoding parameter, and the number of the transmit precoding matrix; The time-frequency resources of the first precoding parameter include: resources of a reference signal carrying the first precoding parameter. The device according to any one of claims 30 to 43, characterized in that The transceiver module is further used to send indication information, where the indication information is used to instruct the terminal to use the first precoding parameter and the second precoding parameter to determine the transmit precoding matrix. The device according to any one of claims 30-44 is characterized in that the second precoding parameter includes at least one of the following: position information of the effective channel factor of the terminal in the equivalent channel factor, and a generation method of the transmit precoding matrix. A communication device, characterized in that it comprises: a processing module and a transceiver module; The transceiver module is used to receive the first precoding parameter broadcast or multicast by the network device; The transceiver module is further used to receive a second precoding parameter; The processing module is used to determine a transmit precoding matrix according to the first precoding parameter and the second precoding parameter. The device according to claim 46 is characterized in that the first precoding parameter is used to indicate spatial information of an uplink between the terminal and a network device. The device according to claim 46 or 47 is characterized in that the first precoding parameter includes at least one of the following: information on a receiving matrix of a network device for receiving an uplink signal, information on a receiving beam of a network device for receiving the uplink signal, information on an antenna panel of a network device for receiving the uplink signal, and information on a port of a network device for receiving the uplink signal. The device according to any one of claims 46-48 is characterized in that the first precoding parameter is carried by a reference signal sent by a network device to the terminal. The device according to claim 49, characterized in that The processing module is further used to measure the reference signal; The processing module is further used to determine the transmit precoding matrix according to the measurement result of the reference signal, the first precoding parameter and the second precoding parameter. The device according to any one of claims 46 to 50, characterized in that the second precoding parameter includes m third precoding parameters: the m third precoding parameters correspond to j time-frequency resources of the terminal, j is a positive integer, and m is a positive integer less than or equal to j; The first precoding parameter includes i fourth precoding parameters, and the i fourth precoding parameters correspond to l time-frequency resources of the terminal, where l is a positive integer and i is a positive integer less than or equal to l. The device according to any one of claims 46 to 51, characterized in that The transceiver module is further used to receive association information between the first precoding parameter and the time-frequency resource and association information between the second precoding parameter and the time-frequency resource. The device according to claim 52, characterized in that The processing module is further used to determine the first precoding parameter according to the association information between the first precoding parameter and the time-frequency resource; The processing module is further used to determine the second precoding parameter according to association information between the second precoding parameter and the time-frequency resource. The device according to any one of claims 46 to 53, characterized in that The transceiver module is further used to receive a mapping pattern, where the mapping pattern is used to indicate a precoding order of the terminal on M time-frequency resources, where M is a positive integer. The device according to claim 54 is characterized in that the M time-frequency resources include j time-frequency resources; the second precoding parameters include: the second precoding parameters corresponding to the j time-frequency resources of the terminal; the precoding orders of the terminal in the j time-frequency resources are different. The device according to claim 49 or 50, characterized in that The transceiver module is further used to receive resource configuration information of the reference signal, and the number of ports indicated by the resource configuration information is the same as at least one of the following: the number of antennas and the number of beams of the network device. The device according to any one of claims 46 to 56, characterized in that The transceiver module is further used to receive at least one of the following information: a carrying mode of the first precoding parameter, a time-frequency resource of the first precoding parameter, the number of the first precoding parameter, the dimension of the first precoding parameter, the resource granularity of the first precoding parameter, the quantization device of the first precoding parameter, and the quantization accuracy of the first precoding parameter; the resource granularity of the second precoding parameter, and the number of the transmit precoding matrix; The time-frequency resources of the first precoding parameter include: resources of a reference signal carrying the first precoding parameter. The device according to any one of claims 46-57 is characterized in that the second precoding parameter includes at least one of the following: position information of the effective channel factor of the terminal in the equivalent channel factor, and a generation method of the transmit precoding matrix. A computer-readable storage medium, characterized in that it includes a program or an instruction, and when the program or the instruction is executed, the method according to any one of claims 1 to 16 is implemented, or the method according to any one of claims 17 to 29 is implemented. A communication device, characterized in that the device comprises a processor and a memory; The memory is used to store computer-executable instructions. When the device is running, the processor executes the computer-executable instructions stored in the memory to enable the device to perform the method as described in any one of claims 1 to 16, or perform the method as described in any one of claims 17 to 29. A communication chip, characterized in that instructions are stored therein, and when the chip is run on a communication device, the method as claimed in any one of claims 1 to 16 is implemented, or the method as claimed in any one of claims 17 to 29 is implemented. A computer program product, characterized in that it includes computer program code, and when the computer program code is run on a communication device, the communication device implements the method described in any one of claims 1 to 16, or implements the method described in any one of claims 17 to 29.