WO2020143580A1

WO2020143580A1 - Vector indication method for constructing precoding vector, and communication apparatus

Info

Publication number: WO2020143580A1
Application number: PCT/CN2020/070495
Authority: WO
Inventors: 王潇涵; 金黄平; 毕晓艳
Original assignee: 华为技术有限公司
Priority date: 2019-01-11
Filing date: 2020-01-06
Publication date: 2020-07-16
Also published as: CN111435850B; CN111435850A

Abstract

The present application provides a vector indication method for constructing a precoding vector, and a communication apparatus. The method comprises: a terminal device generates and sends first indication information, the first indication information being used for indicating one or more frequency domain vectors, the one or more frequency domain vectors being used for constructing precoding vector(s) corresponding to one or more frequency domain units in a frequency domain unit group, and the length of the frequency domain vector(s) being determined by the number of frequency domain units comprised in a bandwidth occupied from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group, wherein the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of a reported bandwidth. The length of the frequency domain vector(s) is determined on the basis of the method, so that the selected frequency domain vector can maintain continuity of a frequency domain, and accurately reflect the changing law of a channel in the frequency domain, thereby helping obtain high feedback precision.

Description

Vector indicating method and communication device for constructing precoding vector

This application requires the priority of the Chinese patent application submitted to the Chinese Patent Office on January 11, 2019, with the application number of 201910028291.8 and the application name of "Vector Instruction Method and Communication Device for Constructing Precoding Vectors", all of which are approved by The reference is incorporated in this application.

Technical field

The present application relates to the field of communication, and more specifically, to a vector indication method and communication device for constructing a precoding vector.

Background technique

In massive multiple-input multiple-output (Massive MIMO) technology, network equipment can reduce interference between multiple users and interference between multiple signal streams of the same user through precoding technology. Thereby improving signal quality, realizing space division multiplexing and improving spectrum utilization.

The terminal device may determine the precoding vector by way of channel measurement, for example, and hope that through feedback, the network device obtains a precoding vector that is the same as or similar to the precoding vector determined by the terminal device. In order to reduce feedback overhead and improve feedback accuracy, in one implementation, the terminal device may indicate the precoding vector to the network device through a feedback method combining space domain compression and frequency domain compression. Specifically, the terminal device may select one or more space domain vectors and one or more frequency domain vectors based on the precoding vectors of each frequency domain unit on each transmission layer, so that the matrix of the matrix constructed by the space domain vectors and frequency domain vectors The weighted sum is used to fit the precoding vector corresponding to each frequency domain unit on each transmission layer.

However, the definition of the length of the frequency domain vector in this implementation is not clear.

Summary of the invention

The present application provides a vector indication method and a communication device for constructing a precoding vector, in order to clarify the length of the frequency domain vector, and then determine the frequency domain vector for constructing the precoding vector.

In the first aspect, a vector indication method for constructing a precoding vector is provided. The method may be executed by a terminal device, or may be executed by a chip configured in the terminal device.

Specifically, the method includes: generating first indication information, where the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit groups The precoding vector corresponding to each frequency domain unit, the length of the frequency domain vector N _{f is} from the frequency domain unit in the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit The number Q of domain units is determined, where the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth occupied by the frequency domain of the reported bandwidth; N _f and Q are all positive integers; send the first indication information.

In the embodiment of the present application, the terminal device determines the length of the frequency domain vector based on the number of frequency domain units contained in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit in the frequency domain unit group , Can make the selected frequency domain vector can maintain the continuity of the frequency domain, and can more accurately reflect the changing law of the channel in the frequency domain. Therefore, it is beneficial to obtain higher feedback accuracy, so that the precoding vector recovered by the network device based on the feedback of the terminal device can be better adapted to the channel, which is further beneficial to improve the subsequent data transmission performance. On the contrary, if the length of the frequency domain vector is determined only according to the number of frequency domain units to be reported, the selected frequency domain vector does not really simulate the changing law of channels on consecutive frequency domain units, so It cannot accurately reflect the changing law of the channel in the frequency domain, the feedback accuracy is affected, and the subsequent data transmission performance may also be affected.

With reference to the first aspect, in some implementation manners of the first aspect, the generating the first indication information includes: generating the first if the frequency domain unit to be reported in the frequency domain unit group meets a preset condition One instruction.

That is, the terminal device may determine whether to use the method provided in the embodiment of the present application to feed back information for constructing the precoding vector according to the frequency domain unit to be reported. For example, when the frequency domain units to be reported are more continuously distributed in frequency domain resources, the method provided in the embodiment of the present application may be used to feed back the information used to construct the precoding vector; for example, when the frequency domain units to be reported When the number is large, the method provided in the embodiment of the present application may be used to feed back the information used to construct the precoding vector.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: receiving second indication information, where the second indication information is used to indicate the number and location of frequency domain units to be reported.

The network device may indicate the number and location of frequency domain units to be reported to the terminal device through the second indication information, so that the terminal device determines whether to use the embodiment of the present application according to the number and/or location of frequency domain units to be reported A method is provided to feed back the information used to construct the precoding vector, and the length of the frequency domain vector used for frequency domain compression can be further determined.

The second indication information may be, for example, the reporting bandwidth (csi-ReportingBand) in the channel state information (channel) state information (CSI) reporting configuration (CSI-ReportConfig). The csi-ReportingBand indicates the number and position of subbands to be reported through a bitmap. When the granularity of the frequency domain unit to be reported and the subband described in the embodiments of the present application are different, the number and position of the frequency domain unit to be reported may be determined based on the predetermined granularity relationship between the frequency domain unit and the subband . Therefore, the csi-ReportingBand can indirectly indicate the number and location of frequency domain units to be reported.

It should be understood that csi-ReportingBand is only an example of the second indication information, and should not constitute any limitation to this application. This application does not exclude other existing signaling or newly added signaling to indicate the number and location of frequency domain units to be reported.

In a second aspect, a vector indication method for constructing a precoding vector is provided. The method may be executed by a network device, or may be executed by a chip configured in the network device.

Specifically, the method includes: receiving first indication information, where the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit groups The precoding vector corresponding to each frequency domain unit, the length of the frequency domain vector N _{f is} from the frequency domain unit in the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit The number Q of domain units is determined, where the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth occupied by the frequency domain of the reported bandwidth; N _f and Q are all positive integers; one or more frequency domain vectors are determined according to the first indication information.

In the embodiment of the present application, the length of the frequency domain vector is determined based on the number of frequency domain units included in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit in the frequency domain unit group. The selected frequency domain vector can maintain the continuity of the frequency domain, and can more accurately reflect the changing law of the channel in the frequency domain. Therefore, it is beneficial to obtain a higher feedback accuracy, so that the precoding vector recovered by the network device based on the feedback of the terminal device can be better adapted to the channel, which is further beneficial to improve the subsequent data transmission performance. On the contrary, if the length of the frequency domain vector is determined only according to the number of frequency domain units to be reported, the selected frequency domain vector does not really simulate the changing law of channels on consecutive frequency domain units, so It cannot accurately reflect the changing law of the channel in the frequency domain, the feedback accuracy is affected, and the subsequent data transmission performance may also be affected.

With reference to the second aspect, in some implementation manners of the second aspect, the determining the one or more frequency domain vectors according to the first indication information includes: the frequency domain unit to be reported in the frequency domain unit group meets In the case of preset conditions, one or more frequency domain vectors are determined according to the first indication information.

In other words, the terminal device may determine whether to use the method provided in the embodiment of the present application to determine the length of the frequency domain vector according to the frequency domain unit to be reported, and feed back the precoding vector based on the dual domain compression method. For example, when the frequency domain units to be reported are more continuously distributed in frequency domain resources, the method provided in the embodiment of the present application may be used to determine the length of the frequency domain vector, and the precoding vector is fed back based on the method of dual domain compression; and For example, when the number of frequency domain units to be reported is large, the method provided in the embodiment of the present application may be used to determine the length of the frequency domain vector, and the precoding vector is fed back based on the dual domain compression method.

With reference to the second aspect, in some implementation manners of the second aspect, the method further includes: sending second indication information, where the second indication information is used to indicate the number and location of frequency domain units to be reported.

The network device may indicate the number and location of frequency domain units to be reported to the terminal device through the second indication information, so that the terminal device determines whether to use the embodiment of the present application according to the number and/or location of frequency domain units to be reported The provided method determines the length of the frequency domain vector, and feeds back the precoding vector based on the dual-domain compression method, and can further determine the length of the frequency domain vector for frequency domain compression.

With reference to the first aspect or the second aspect, in some implementations, the preset condition includes: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, where x is a predefined value , 0<x≤1.

That is, when the number of frequency domain units to be reported in the frequency domain unit group occupies a large proportion in the frequency domain unit group, the method provided in the embodiment of the present application may be used to determine the length of the frequency domain vector and based on dual domain compression Method to feed back precoding vectors.

Optionally, x is 0.5.

It should be understood that x of 0.5 is only one possible value of x provided in this application, and should not constitute any limitation to this application.

With reference to the first aspect or the second aspect, in some implementations, N _f =Q.

A set of frequency domain vectors of different lengths can be predefined in the frequency domain vector set. When the terminal device determines the Q value, it can directly select a frequency domain vector with a length equal to the Q value from the set of frequency domain vectors. The length of the frequency domain vector determined based on this method makes the selected frequency domain vector maintain the continuity of the frequency domain, which is beneficial to obtain higher feedback accuracy.

With reference to the first aspect or the second aspect, in some implementations, N _f >Q.

In the frequency domain vector set, only a set of frequency domain vectors of a certain length may be defined. When the terminal device determines the Q value, it can select a frequency domain vector with a length greater than the Q value from the set of frequency domain vectors. The length of the frequency domain vector determined based on this method enables the selected frequency domain vector to maintain the continuity of the frequency domain, which is beneficial to obtain higher feedback accuracy.

In the third aspect, a method for reporting a precoding matrix indicator (precoding matrix indicator (PMI)) is provided. The method may be executed by a terminal device, or may be executed by a chip configured in the terminal device.

Specifically, the method includes: generating a PMI; where the frequency domain unit to be reported in the frequency domain unit group satisfies a preset condition, the PMI includes an indication of one or more frequency domain vectors, and the one or more The frequency domain vector is a part of the frequency domain vector in the frequency domain vector group. The frequency domain vector group includes a plurality of frequency domain vectors, and the plurality of frequency domain vectors are mutually orthogonal to each other; in the frequency domain unit group When the reported frequency domain unit does not satisfy the preset condition, the PMI does not include an indication of the frequency domain vector; wherein, the frequency domain unit group includes one or more frequency domain units, and the frequency domain unit group occupies The bandwidth is the frequency domain where the reported bandwidth occupies part or all of the bandwidth; the PMI is sent.

In a fourth aspect, a method for reporting PMI is provided. The method may be performed by a network device or may be performed by a chip configured in the network device.

Specifically, the method includes: receiving a PMI; where the frequency domain unit to be reported in the frequency domain unit group satisfies a preset condition, the PMI includes an indication of one or more frequency domain vectors, and the one or more The frequency domain vector is a part of the frequency domain vector in the frequency domain vector group. The frequency domain vector group includes a plurality of frequency domain vectors and the two frequency domain vectors are mutually orthogonal to each other; to be reported in the frequency domain unit group If the frequency domain unit does not satisfy the preset condition, the PMI does not include an indication of the frequency domain vector; wherein, the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group To occupy part or all of the bandwidth in the frequency domain for reporting bandwidth; according to the PMI and whether the frequency domain unit to be reported in the frequency domain unit group satisfies the preset condition, determine the precoding matrix corresponding to each frequency domain unit.

In the embodiment of the present application, for the convenience of distinction and description, a method of selecting a part of frequency domain vectors from the frequency domain vector group and reporting to construct a precoding vector is called a first compression method; the entire frequency domain vector group is used to construct a precoding method. The method of encoding vectors is called a second compression method based on frequency domain transformation.

In order to obtain higher feedback accuracy at the same cost, the terminal device may determine a reasonable feedback method according to the number and/or location of frequency domain units to be reported. In a variety of feedback methods including the feedback method of type II (type II) codebook and the feedback method based on dual-domain compression (including the above-mentioned first compression method and second compression method), the feedback overhead and feedback accuracy are comprehensively considered to Achieve the effect of higher feedback accuracy at the same cost.

With reference to the third aspect or the fourth aspect, in some implementations, the preset condition includes: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, where x is a predefined value, 0 ＜x≤1, Q represents the number of frequency domain units to be reported in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit to be reported in this frequency domain unit group, Q is positive Integer.

That is, when the number of frequency domain units to be reported in the frequency domain unit group occupies a large proportion in the frequency domain unit group, a part of the frequency domain vectors can be selected from the frequency domain vector group as the frequency domain for constructing the precoding vector vector.

With reference to the third aspect or the fourth aspect, in some implementations, the preset condition includes: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a preset threshold.

That is, when there are a large number of frequency domain units to be reported in the frequency domain unit group, all frequency domain vectors in the frequency domain vector group may be used as frequency domain vectors for constructing a precoding vector.

With reference to the third aspect or the fourth aspect, in some implementations, when the frequency domain unit to be reported meets a preset condition, the length N _{f of} the frequency domain vector is selected from the first in the frequency domain unit group The number Q of frequency domain units to be reported from the frequency domain unit to be reported to the last frequency domain unit to be reported in the bandwidth occupied by the frequency domain unit to be reported is determined, and N _f and Q are both positive integers.

The length of the frequency domain vector is determined based on the number of frequency domain units included in the bandwidth from the first frequency domain unit to be reported to the last frequency domain unit in the frequency domain unit group, so that the selected frequency domain vector can be made It can maintain the continuity of the frequency domain, and can more accurately reflect the changing law of the channel in the frequency domain. Therefore, it is beneficial to obtain a higher feedback accuracy, so that the precoding vector recovered by the network device based on the feedback of the terminal device can be better adapted to the channel, which is further beneficial to improve the subsequent data transmission performance.

With reference to the third aspect or the fourth aspect, in some implementations, if the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, if the PMI includes an indication of the frequency domain vector group, the The length N ₄ of the frequency domain vector in the frequency domain vector group is determined by the number of frequency domain units to be reported in the frequency domain unit group, and N ₄ is a positive integer.

In the case where the number of subbands is small, it may be considered to use the entire frequency domain vector group to construct a precoding vector. The length of the frequency domain vector is determined according to the number of frequency domain units to be reported, that is, the same number of frequency domain vectors as the number of frequency domain vectors are selected to construct the precoding vector. Compared with the length of the frequency domain vector determined by Q, the frequency domain vector used to construct the precoding vector can be reduced, so that the number of weighting coefficient reports can be reduced, which is beneficial to reduce feedback overhead.

In a fifth aspect, a communication device is provided, including various modules or units for performing the method in the first aspect or the third aspect and any possible implementation manner of the first aspect or the third aspect.

In a sixth aspect, a communication device is provided, including a processor. The processor is coupled to the memory and can be used to execute instructions in the memory to implement the first aspect or the third aspect and the method in any possible implementation manner of the first aspect or the third aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver or an input/output interface.

In another implementation, the communication device is a chip configured in the terminal device. When the communication device is a chip configured in a terminal device, the communication interface may be an input/output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

According to a seventh aspect, a communication device is provided, including various modules or units for performing the method in any one of the second aspect or the fourth aspect and any possible implementation manner of the second aspect or the fourth aspect.

In an eighth aspect, a communication device is provided, including a processor. The processor is coupled to the memory, and can be used to execute instructions in the memory to implement the second aspect or the fourth aspect and the method in any possible implementation manner of the second aspect or the fourth aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

In one implementation, the communication device is a network device. When the communication device is a network device, the communication interface may be a transceiver or an input/output interface.

In another implementation, the communication device is a chip configured in a network device. When the communication device is a chip configured in a network device, the communication interface may be an input/output interface.

In a ninth aspect, a processor is provided, including: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes any of the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect The method.

In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits. The input signal received by the input circuit may be received and input by, for example, but not limited to a receiver, the signal output by the output circuit may be, for example but not limited to, output to and transmitted by the transmitter, and the input circuit and output The circuit may be the same circuit, which is used as an input circuit and an output circuit at different times, respectively. The embodiments of the present application do not limit the specific implementation manner of the processor and various circuits.

According to a tenth aspect, a processing device is provided, including a processor and a memory. The processor is used to read instructions stored in the memory, and can receive signals through the receiver and transmit signals through the transmitter to perform any of the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect Methods.

Optionally, there are one or more processors and one or more memories.

Optionally, the memory may be integrated with the processor, or the memory and the processor are provided separately.

In the specific implementation process, the memory may be non-transitory (non-transitory) memory, such as read-only memory (read only memory (ROM), which may be integrated with the processor on the same chip, or may be set in different On the chip, the embodiments of the present application do not limit the type of memory and the manner of setting the memory and the processor.

It should be understood that the related data interaction process, for example, sending instruction information may be a process of outputting instruction information from the processor, and receiving capability information may be a process of receiving input capability information by the processor. Specifically, the data output by the processor may be output to the transmitter, and the input data received by the processor may come from the receiver. Among them, the transmitter and the receiver may be collectively referred to as a transceiver.

The processing device in the above tenth aspect may be one or more chips, and the processor may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; When implemented by software, the processor may be a general-purpose processor, implemented by reading software codes stored in a memory, the memory may be integrated in the processor, may be located outside the processor, and exists independently.

According to an eleventh aspect, a computer program product is provided. The computer program product includes: a computer program (also referred to as code or instructions) that, when the computer program is executed, causes a computer to perform the first aspect to The fourth aspect and the method in any possible implementation manner of the first aspect to the fourth aspect.

According to a twelfth aspect, there is provided a computer-readable medium that stores a computer program (also may be referred to as code or instructions) that when executed on a computer, causes the computer to perform the above-mentioned first aspect to The fourth aspect and the method in any possible implementation manner of the first aspect to the fourth aspect.

In a thirteenth aspect, a communication system is provided, including the aforementioned network device and terminal device.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of a communication system applicable to a vector indicating method for constructing a precoding vector according to an embodiment of the present application;

2 is a schematic flowchart of a vector indicating method for constructing a precoding vector provided by an embodiment of the present application;

3 and 4 are schematic diagrams of frequency domain unit groups and reporting bandwidth provided by embodiments of the present application;

5 is a schematic diagram of a bitmap, a reporting bandwidth, and a frequency domain unit group provided by an embodiment of this application;

6 is a schematic flowchart of a method for reporting PMI according to another embodiment of the present application;

7 is a schematic block diagram of a communication device provided by an embodiment of the present application;

8 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

9 is a schematic structural diagram of a network device provided by an embodiment of the present application.

detailed description

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

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global mobile communication (global system for mobile communications, GSM) system, code division multiple access (code division multiple access (CDMA) system, broadband code division multiple access) (wideband code division multiple access (WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time division duplex (time division duplex, TDD), universal mobile communication system (universal mobile telecommunication system, UMTS), global interconnection microwave access (worldwide interoperability for microwave access, WiMAX) communication system, future fifth generation (5th generation, 5G) system or new radio (NR), etc.

In order to facilitate understanding of the embodiments of the present application, first, the communication system shown in FIG. 1 is taken as an example to describe in detail the communication system applicable to the embodiments of the present application. FIG. 1 is a schematic diagram of a communication system 100 suitable for a vector indication method for constructing a precoding vector according to an embodiment of the present application. As shown in FIG. 1, the communication system 100 may include at least one network device, such as the network device 110 shown in FIG. 1; the communication system 100 may also include at least one terminal device, such as the terminal device 120 shown in FIG. 1. The network device 110 and the terminal device 120 can communicate through a wireless link. Each communication device, such as the network device 110 or the terminal device 120, may be configured with multiple antennas. For each communication device in the communication system 100, the configured multiple antennas may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Therefore, the communication devices in the communication system 100, such as the network device 110 and the terminal device 120, can communicate through multi-antenna technology.

It should be understood that the network device in the communication system may be any device with wireless transceiver function. The network equipment includes but is not limited to: evolved Node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), node B (Node B, NB), base station controller (base station controller, BSC) ), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (WiFi) system Access point (access point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or sending and receiving point (transmission and reception point, TRP), etc., can also be 5G, such as, NR, gNB in the system, or transmission point (TRP or TP), one or a group (including multiple antenna panels) of the base station in the 5G system, or it can also be a network node that constitutes a gNB or transmission point , Such as baseband unit (BBU), or distributed unit (DU), etc.

In some deployments, gNB may include a centralized unit (CU) and DU. The gNB may also include a radio unit (RU). The CU implements some functions of gNB, and the DU implements some functions of gNB. For example, CU implements radio resource control (RRC), packet data convergence protocol (PDCP) layer functions, DU implements radio link control (RLC), media access control (media access control, MAC) and physical (PHY) layer functions. Since the information of the RRC layer will eventually become the information of the PHY layer or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , Or, sent by DU+CU. It can be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into network devices in a radio access network (RAN), and may also be divided into network devices in a core network (CN), which is not limited in this application.

It should also be understood that the terminal equipment in the wireless communication system may also be referred to as user equipment (UE), access terminal, subscriber unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, User terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, and an augmented reality (augmented reality, AR) terminal Wireless terminals in equipment, industrial control (industrial control), wireless terminals in self-driving (self-driving), wireless terminals in remote medical (remote medical), wireless terminals in smart grid (smart grid), transportation safety ( Wireless terminals in transportation, safety terminals in smart cities, wireless terminals in smart homes, etc. The embodiments of the present application do not limit application scenarios.

It should also be understood that FIG. 1 is only a simplified schematic diagram for ease of understanding and examples. The communication system 100 may also include other network devices or other terminal devices, which are not shown in FIG. 1.

In order to facilitate understanding of the embodiments of the present application, the following briefly describes the processing procedure of the downlink signal at the physical layer before sending. It should be understood that the processing procedure for the downlink signal described below may be performed by the network device, or may also be performed by a chip configured in the network device. For convenience of explanation, they are collectively referred to as network devices hereinafter.

The network device can process the code word on the physical channel. The codeword may be coded bits that have been coded (eg, including channel coding). The codeword is scrambled to generate scrambling bits. The scrambled bits undergo modulation mapping to obtain modulation symbols. The modulation symbols are mapped to multiple layers (layers) through layer mapping, or transmission layers. The modulation symbols after layer mapping are subjected to precoding to obtain a precoded signal. The pre-encoded signal is mapped to multiple REs after being mapped to resource elements (RE). These REs are then orthogonally multiplexed (orthogonal frequency division multiplexing, OFDM) modulated and transmitted through the antenna port.

It should be understood that the processing procedure for the downlink signal described above is only an exemplary description, and should not constitute any limitation to this application. For the specific processing procedure of the downlink signal, reference may be made to the prior art. For brevity, a detailed description of the specific procedure is omitted here.

In order to facilitate understanding of the embodiments of the present application, the following briefly describes the terms involved in the embodiments of the present application. It should be understood that these descriptions are merely to facilitate understanding of the embodiments of the present application, and should not constitute any limitation to the present application.

1. Precoding technology: the sending device (such as a network device) can process the signal to be transmitted with the help of a precoding matrix that matches the channel resource when the channel state is known, so that the precoded signal to be transmitted and the channel It is adapted to reduce the complexity of receiving devices (such as terminal devices) to eliminate the influence between channels. Therefore, through the precoding process of the signal to be transmitted, the received signal quality (for example, signal to interference plus noise ratio (SINR), etc.) can be improved. Therefore, by using precoding technology, transmission devices and multiple receiving devices can be transmitted on the same time-frequency resources, that is, multiple users, multiple inputs, and multiple outputs (MU-MIMO).

It should be understood that the relevant description of the precoding technology is only an example for easy understanding, and is not intended to limit the protection scope of the embodiments of the present application. In the specific implementation process, the sending device may also perform precoding in other ways. For example, when channel information (such as, but not limited to, channel matrix) cannot be obtained, pre-coding is performed using a pre-coding matrix or a weighting processing method set in advance. For brevity, the specific content of this article will not be repeated here.

2. Precoding matrix and precoding matrix indicator (PMI): PMI can be used to indicate the precoding matrix. The precoding matrix may be, for example, a precoding matrix corresponding to each frequency domain unit determined by the terminal device based on the channel matrix of each frequency domain unit (eg, subband).

The channel matrix may be determined by the terminal device through channel estimation or other methods or based on channel reciprocity. However, it should be understood that the specific method for the terminal device to determine the channel matrix is not limited to the above, and the specific implementation manner may refer to the existing technology.

The precoding matrix can be obtained by singular value decomposition (SVD) of the channel matrix or the covariance matrix of the channel matrix, or by eigenvalue decomposition (eigenvalue decomposition) of the covariance matrix of the channel matrix. EVD).

It should be understood that the manner of determining the precoding matrix listed above is only an example, and should not constitute any limitation to this application. For the determination method of the precoding matrix, reference may be made to the existing technology, and for the sake of brevity, they are not listed here one by one.

It should be noted that in the embodiment of the present application, the precoding matrix corresponding to the frequency domain unit may refer to the precoding matrix fed back for the frequency domain unit, for example, it may be performed based on the reference signal on the frequency domain unit Precoding matrix for channel measurement and feedback. The precoding matrix corresponding to the frequency domain unit may be used as a precoding matrix for precoding subsequent data transmitted through the frequency domain unit. Hereinafter, the precoding matrix corresponding to the frequency domain unit may also be simply referred to as the precoding matrix of the frequency domain unit, and the precoding vector corresponding to the frequency domain unit may also be referred to as the precoding vector of the frequency domain unit.

It should also be noted that, in the embodiment of the present application, the precoding matrix determined by the network device based on the feedback of the terminal device may be directly used for downlink data transmission; it may also go through some beamforming methods, for example, including zero forcing (zero forcing, ZF), regularized zero-forcing (RZF), minimum mean square error (MMSE), signal-to-leakage-and-noise (SLNR), etc. To obtain the precoding matrix that is ultimately used for downlink data transmission. This application does not limit this. Unless otherwise specified, the precoding matrix (or vector) referred to below may refer to the precoding matrix (or vector) determined by the network device based on feedback from the terminal device.

3. Precoding vectors: A precoding matrix may include one or more vectors, such as column vectors. A precoding matrix can be used to determine one or more precoding vectors.

When the number of transmission layers is 1 and the number of polarization directions of the transmitting antenna is 1, the precoding vector may be a precoding matrix. When there are multiple transmission layers and the number of polarization directions of the transmitting antenna is 1, the precoding vector may refer to the component of the precoding matrix on one transmission layer. When the number of transmission layers is 1 and the number of polarization directions of the transmitting antenna is multiple, the precoding vector may refer to the component of the precoding matrix in one polarization direction. When there are multiple transmission layers and there are multiple polarization directions of the transmitting antenna, the precoding vector may refer to the components of the precoding matrix in one transmission layer and one polarization direction.

It should be understood that the precoding vector may also be determined by the vector in the precoding matrix, for example, obtained by performing mathematical transformation on the vector in the precoding matrix. This application does not limit the mathematical transformation relationship between the precoding matrix and the precoding vector.

4. Antenna port: short for port. It can be understood as a virtual antenna recognized by the receiving device. Or a transmit antenna that can be distinguished in space. One antenna port can be configured for each virtual antenna, each virtual antenna can be a weighted combination of multiple physical antennas, and each antenna port can correspond to one reference signal, therefore, each antenna port can be called a reference signal port . In the embodiment of the present application, the antenna port may refer to an actual independent transmitting unit (TxRU).

5. Dual domain compression: Including air domain compression and frequency domain compression. Spatial domain compression may refer to selecting one or more spatial domain vectors in the spatial domain vector set as the spatial domain vectors for constructing the precoding vector. Frequency domain compression may refer to selecting one or more frequency domain vectors from a set of frequency domain vectors as frequency domain vectors for constructing a precoding vector. The selected airspace vector is part or all of the airspace vectors in the set of airspace vectors. The selected frequency domain vector is part or all of the frequency domain vectors in the frequency domain vector set.

The matrix determined by one space domain vector and one frequency domain vector may be, for example, a space frequency component matrix. The selected one or more space domain vectors and one or more frequency domain vectors can be used to determine one or more space frequency component matrices. The weighted sum of the one or more space-frequency component matrices can be used to construct a space-frequency matrix corresponding to one transmission layer. In other words, the space-frequency matrix can be approximated as the weighted sum of the space-frequency component matrix determined by the selected one or more space-domain vectors and one or more frequency-domain vectors. Here, the space domain vector and the frequency domain vector used to construct a space frequency component matrix may be called a space frequency vector pair.

Therefore, after the network device obtains the space domain vector, frequency domain vector, and weighting coefficients that can be used to construct the space frequency matrix, it can further determine the precoding vector corresponding to each frequency domain unit based on the constructed space frequency matrix.

In a possible implementation manner, the terminal device may feed back indications of L space domain vectors, indications of M frequency domain vectors, and indications of K weighting coefficients to the network device. Among them, K≤L×M. Among them, L space domain vectors and M frequency domain vectors can be used to construct L×M space frequency vector pairs. Each space-frequency vector pair in the L×M space-frequency vector pairs may include one space-domain vector in L space-domain vectors and one frequency-domain vector in M frequency-domain vectors. A space frequency vector pair is uniquely determined by a space domain vector and a frequency domain vector. The terminal device may feedback the weighting coefficient based on some or all of the L×M space-frequency vector pairs. Therefore, the number K of weighting coefficients fed back by the terminal device may be less than or equal to the number L×M of space-frequency vector pairs.

It should be understood that the above is only for ease of understanding, and shows a possible implementation manner of dual-domain compression, but this should not constitute any limitation to the present application. For example, at least one of the L space domain vectors and the M frequency domain vectors may also be predefined, which is not limited in this application.

In summary, the dual-domain compression is separately compressed in the air domain and the frequency domain. When the terminal device feeds back, it can feed the selected one or more space domain vectors and one or more frequency domain vectors to the network device, instead of separately feeding back the subbands based on each frequency domain unit (such as subband). Weighting factors (including amplitude and phase). Therefore, the feedback overhead can be greatly reduced. At the same time, since the frequency domain vector can represent the change law of the channel in frequency, the linear change of the channel in the frequency domain can be simulated by linear superposition of one or more frequency domain vectors. Therefore, high feedback accuracy can still be maintained, so that the precoding matrix recovered by the network device based on the feedback of the terminal device can still be well adapted to the channel.

Specific details about dual-domain compression can reference number R1-1813002 proposal of Third Generation Partnership Project ^{(3 rd generation partnership project, 3GPP} ) proposal "based compression of DFT (DFT-based compression)". For brevity, a detailed description of this method is omitted here.

6. Frequency domain vector (frequency domain vector): a vector used in the embodiment of the present application to represent the change rule of the channel in the frequency domain. Each frequency domain vector can represent a variation law. Since the signal is transmitted through the wireless channel, the transmitting antenna can reach the receiving antenna through multiple paths. Multipath delay causes frequency selective fading, which is the change of frequency domain channel. Therefore, different frequency domain vectors can be used to represent the change law of the channel in the frequency domain caused by the delay on different transmission paths.

In the following, for convenience of explanation, it is assumed that the frequency domain vector is denoted as v. The length of the frequency domain vector can be written as N _f , N _f ≥1, and it is an integer. The design of the length N _f of the frequency domain vector will be described in detail in the following embodiments, and the detailed description of the length of the frequency domain vector will be omitted here.

7. Frequency domain vector set: It can include frequency domain vectors of different lengths. One or more frequency domain vectors in the set of frequency domain vectors are selected to construct a precoding vector.

In a possible design, the set of frequency domain vectors may include multiple frequency domain vectors. The multiple frequency domain vectors may be orthogonal to each other. Each frequency domain vector in the set of frequency domain vectors can be taken from a Discrete Fourier Transform (Discrete Fourier Transform, DFT) matrix.

For example, the N _f frequency domain vectors can be written as

The N _f frequency domain vectors can construct a matrix B _f ,

In another possible design, the frequency-domain vector set can be extended oversampling factor O _f O _{_f} × N _f is the frequency-domain vectors. In this case, the frequency-domain vector set may comprise O _f subsets, each subset may include N _f frequency-domain vectors. The N _f frequency domain vectors in each subset can be orthogonal to each other. Each subset can be called an orthogonal group. Each frequency domain vector in the set of frequency domain vectors can be taken from an oversampled DFT matrix. Wherein the oversampling factor O _f is a positive integer.

For example, the N _f frequency domain vectors in the o _f (0≤o _f ≤O _f -1 and o _f are integers) subsets of the set of frequency domain vectors can be written as

Then, based on the N _f frequency domain vectors in the o _f th subset, a matrix can be constructed

Therefore, each frequency domain vector in the set of frequency domain vectors can be taken from a DFT matrix or an oversampled DFT matrix. Each column vector in the set of frequency domain vectors may be referred to as a DFT vector or an oversampled DFT vector. In other words, the frequency domain vector may be a DFT vector or an oversampled DFT vector.

In the embodiment of the present application, the frequency domain vector group may refer to a set of frequency domain vectors composed of mutually orthogonal vectors in the DFT matrix, or may refer to a subset in the oversampling DFT matrix. In other words, each frequency domain vector in the frequency domain vector group is orthogonal to each other. Therefore, the frequency domain vector set may include one or more frequency domain vector groups.

8. Spatial vector (spatial domain vector): or beam vector. Each element in the airspace vector may represent the weight of each antenna port. Based on the weight of each antenna port represented by each element in the space vector, linearly superimposing the signals of each antenna port can form a region with a strong signal in a certain direction in space.

In the following, for convenience of explanation, it is assumed that the space vector is denoted as u. The length of the space vector u can be the number of transmit antenna ports N _{s in} one polarization direction, N _s ≥ 1 and an integer. The space domain vector may be, for example, a column vector or a row vector of length N _s . This application does not limit this.

For the definition of the airspace vector, please refer to the two-dimensional (2dimensions, 2D)-DFT vector or oversampling 2D-DFT vector v _l,m defined in the Type II codebook of the NR protocol TS 38.214 version 15 (release 15, R15) For brevity, they are not described in detail here.

9. Airspace vector set: can include a variety of airspace vectors of different lengths to correspond to different numbers of transmit antenna ports. In the embodiment of the present application, the length of the airspace vector is N _s , so the length of each airspace vector in the airspace vector set to which the airspace vector reported by the terminal device belongs is N _s .

In a possible design, the set of space domain vectors may include N _s space domain vectors, and the N _s space domain vectors may be orthogonal to each other. Each space vector in the set of space vectors can be taken from a two-dimensional (2dimension, 2D)-DFT matrix. Among them, 2D can represent two different directions, such as a horizontal direction and a vertical direction.

For example, the N _s space vectors can be written as

The N _s space domain vectors can construct the matrix B _s ,

In another possible design, the set of space domain vectors can be expanded to O _s ×N _s space domain vectors by an oversampling factor O _s . In this case, the set of space domain vectors may include O _s subsets, and each subset may include N _s space domain vectors. The N _s space vectors in each subset can be orthogonal to each other. Each subset can be called an orthogonal group. Each space vector in the set of space vectors can be taken from an oversampled 2D-DFT matrix. Among them, the oversampling factor O _s is a positive integer. Specifically, O _s =O ₁ ×O ₂ , O ₁ may be an oversampling factor in the horizontal direction, and O ₂ may be an oversampling factor in the vertical direction. O ₁ ≥1, O ₂ ≥1, O ₁ and O _{2 are} not 1 at the same time, and are both integers.

For example, the N _s space domain vectors in the o _s (0≤o _s ≤O _s -1 and o _s are integers) subsets of the set of space domain vectors can be written as

Then based on the N _s space vectors in the o _s subset, a matrix can be constructed

Therefore, each space vector in the set of space vectors can be taken from a DFT matrix or an oversampled DFT matrix. Each column vector in the set of space vectors may be referred to as a DFT vector. In other words, the spatial domain vector may be a DFT vector.

In the embodiment of the present application, the spatial domain vector group may refer to a set of spatial domain vectors composed of two mutually orthogonal vectors in the DFT matrix, or may refer to a subset in the oversampling DFT matrix. In other words, each space vector in the space vector group is orthogonal to each other. Therefore, the set of airspace vectors may include one or more groups of airspace vectors.

10. Frequency domain unit: a unit of frequency domain resources, which can represent different frequency domain resource granularities. The frequency domain unit may include, for example but not limited to, subband, resource block (resource block (RB), subcarrier, resource block group (RBG) or precoding resource block group (PRG), etc. .

In the embodiment of the present application, the precoding matrix corresponding to the frequency domain unit may refer to the precoding matrix determined based on channel measurement and feedback based on the reference signal on the frequency domain unit. The precoding matrix corresponding to the frequency domain unit can be used for precoding subsequent data transmitted through the frequency domain unit. Hereinafter, the precoding matrix or precoding vector corresponding to the frequency domain unit may also be simply referred to as the precoding matrix or precoding vector of the frequency domain unit.

11. Space frequency component matrix: A space frequency component matrix can be determined by a space domain vector and a frequency domain vector. A space-frequency component matrix can be determined by, for example, the conjugate transposition of a space-domain vector and a frequency-domain vector, such as u×v ^H , and its dimension can be N _s ×N _f .

It should be understood that the space-frequency component matrix may be an expression form of a basic unit of space-frequency determined by a space-domain vector and a frequency-domain vector. The space-frequency basic unit can also be represented as a space-frequency component vector, for example, which can be determined by the Kronecker product of a space-domain vector and a frequency-domain vector; the space-frequency basic unit can also be represented, for example. Space-frequency vector equivalent. This application does not limit the specific manifestation of the basic unit of space frequency. Based on the same conception, those skilled in the art should consider that all possible forms determined by one space domain vector and one frequency domain vector should fall within the scope of protection of the present application. In addition, if the space domain vector or the frequency domain vector is defined in a different form from the above list, the operation relationship between the space frequency component matrix and the space domain vector and frequency domain vector may also be different. This application does not limit the operation relationship between the space-frequency component matrix, the space-domain vector, and the frequency-domain vector.

12. Space-frequency matrix: In the embodiment of the present application, the space-frequency matrix can be understood as an intermediate quantity for determining the precoding matrix. For the terminal device, the space frequency matrix may be determined by the precoding matrix or the channel matrix. For the network equipment, the space-frequency matrix may be obtained by weighted sum of multiple space-frequency component matrices, which is used to recover the downlink channel or the precoding matrix.

As mentioned above, the space-frequency component matrix can be expressed as a matrix of dimension N _s ×N _f , and the space-frequency matrix can also be expressed as a matrix of dimension N _s ×N _f . The space-frequency matrix whose dimension is N _s ×N _f may include N _f column vectors of length N _s . The N _f column vectors may correspond to N _f frequency domain units, and each column vector may be used to determine the corresponding precoding vector of the frequency domain unit.

For example, the space-frequency matrix can be written as H,

Among them, w ₁ to

Are N _f column vectors corresponding to N _f frequency domain units, and the length of each column vector may be N _s . The N _f column vectors can be used to determine the precoding vectors of N _f frequency domain units, respectively.

It should be understood that the space-frequency matrix is only one form of expression for determining the intermediate quantity of the precoding matrix, and should not constitute any limitation to this application. For example, if the column vectors in the space-frequency matrix are connected in the first order from left to right, or arranged according to other predefined rules, a vector of length N _s ×N _f can also be obtained. This vector can be called Space frequency vector.

It should also be understood that the dimensions of the space-frequency matrix and space-frequency vector shown above are only examples, and should not constitute any limitation to this application. For example, the space-frequency matrix may also be a matrix of dimension N _f ×N _s . Each row vector may correspond to a frequency domain unit, which is used to determine the corresponding precoding vector of the frequency domain unit.

In addition, when the transmitting antenna is configured with multiple polarization directions, the dimension of the space-frequency matrix can be further expanded. For example, for a dual-polarization directional antenna, the dimension of the space-frequency matrix may be 2N _s ×N _f or N _f ×2N _s . It should be understood that the number of polarization directions of the transmitting antenna is not limited in this application.

13. Channel state information reference signal (channel-state information reference, CSI-RS): can be used for downlink channel measurement and interference measurement. In the embodiment of the present application, the CSI-RS is mainly used for downlink channel measurement. The network device can transmit the CSI-RS on pre-configured time-frequency resources. The terminal device may receive the CSI-RS on the pre-configured time-frequency resource, so as to perform downlink channel measurement according to the received CSI-RS.

It should be understood that the CSI-RS is only one possible reference signal for channel measurement, and should not constitute any limitation to this application. This application does not exclude the possibility of defining other reference signals that can be used to implement the same or similar functions in future agreements.

14. Reporting bandwidth (reporting bandwidth): In the embodiment of the present application, the reporting bandwidth may refer to the reporting bandwidth (csi-ReportingBand) in the CSI reporting configuration (CSI-ReportConfig) via the information element (IE) with the network device. ) The bandwidth corresponding to the field. When the network device indicates the subband to be reported through csi-ReportingBand, the bandwidth corresponding to the csi-ReportingBand may be the reporting bandwidth.

The terminal device can receive the CSI-RS on the reporting bandwidth to perform channel measurement and reporting. In the embodiment of the present application, the reporting bandwidth may be the bandwidth occupied by the CSI-RS on which the terminal device performs CSI reporting once.

In one implementation, the reported bandwidth may be the bandwidth occupied by the CSI-RS resource in the frequency domain. The frequency domain occupied bandwidth of the CSI-RS resource can be configured by IE-CSI frequency domain occupied bandwidth (CSI-FrequencyOccupation).

The network device may further indicate the number and location of subbands (that is, an example of frequency domain units) to be reported through the csi-ReportingBand field. This field can be a bitmap. The length of the bitmap may be the number of subbands included in the reported bandwidth. In other words, the bandwidth occupied by the first indication bit to the last indication bit in the bitmap may be the aforementioned reporting bandwidth. Each indicator bit in the bitmap may correspond to a subband in the reported bandwidth. Each indicator bit is used to indicate whether the corresponding subband needs to report CSI. For example, when the indication bit is set to "1", the corresponding subband needs to report CSI; when the indication bit is set to "0", the corresponding subband does not need to report CSI. It should be understood that the meanings expressed by the values of the indication bits listed here are only examples, and should not constitute any limitation to this application.

It should be understood that the signaling for configuring the reporting bandwidth and the signaling for indicating the subband to be reported are only examples, and should not constitute any limitation to this application. This application does not limit the signaling used to indicate the reporting bandwidth, the signaling used to indicate the subband to be reported, and the specific indication method.

It should also be understood that the foregoing description of the reported bandwidth is only an example for ease of understanding, and should not constitute any limitation to this application.

In addition, in order to facilitate understanding of the embodiments of the present application, the following points are made.

First, in order to facilitate understanding and explanation, the main parameters involved in this application are explained as follows:

N _f : length of frequency domain vector, N _f ≥ 1 and an integer;

N _s : the length of the space vector, N _s ≥ 1 and an integer;

M: the number of frequency domain vectors reported, M≥1 and an integer;

L: the number of reported space vectors, L≥1 and an integer;

K: the number of reported weighting coefficients, K≥1 and an integer;

R: number of transmission layers, R≥1 and an integer.

Second, in the embodiments of the present application, for ease of description, when numbering is involved, consecutive numbering may be started from 0. For example, the R transmission layers may include the 0th transmission layer to the R-1 transmission layer; for another example, the L spatial domain vectors may include the 0th spatial domain vector to the L-1 spatial domain vector, and so on, here No more examples will be given. Of course, the specific implementation is not limited to this, for example, it may be consecutively numbered starting from 1. It should be understood that the foregoing descriptions are all settings that are convenient for describing the technical solutions provided by the embodiments of the present application, and are not intended to limit the scope of the present application.

Thirdly, in the embodiments of the present application, many places involve transformation of matrices and vectors. For ease of understanding, a unified description is made here. The superscript T indicates the transpose, for example, A ^T indicates the transpose of the matrix (or vector) A; the superscript H indicates the conjugate transpose, for example, A ^H indicates the conjugate transpose of the matrix (or vector) A. In the following, for the sake of brevity, descriptions of the same or similar situations are omitted.

Fourth, in the embodiments shown below, the space domain vector and the frequency domain vector are both column vectors as an example to illustrate the embodiment provided by this application, but this should not constitute any limitation to this application. Based on the same conception, those skilled in the art can also think of other possible expressions.

Fifth, in the embodiments of the present application, "for indicating" may include both for direct indication and for indirect indication. For example, when describing certain indication information for indicating information I, the indication information may include direct indication I or indirect indication I, but does not mean that the indication information must carry I.

The information indicated by the indication information is called information to be indicated. In the specific implementation process, there are many ways to indicate the indication information. For example, but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the Indication index etc. The information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to achieve the indication of specific information by means of the arrangement order of various information pre-agreed (for example, stipulated in a protocol), thereby reducing the indication overhead to a certain extent. At the same time, it is also possible to identify the common parts of the various information and uniformly indicate, so as to reduce the instruction overhead caused by separately indicating the same information. For example, those skilled in the art should understand that the precoding matrix is composed of precoding vectors, and each precoding vector in the precoding matrix may have the same part in terms of composition or other attributes.

In addition, the specific indication method may also be various existing indication methods, such as, but not limited to, the above indication methods and various combinations thereof. For specific details of various indication methods, reference may be made to the prior art, and details are not repeated herein. It can be seen from the above that, for example, when multiple information of the same type needs to be indicated, there may be cases where different information is indicated in different ways. In the specific implementation process, the required indication method can be selected according to specific needs. The embodiments of the present application do not limit the selected indication method. In this way, the indication methods involved in the embodiments of the present application should be understood as covering Fang obtains various methods of the information to be indicated.

In addition, there may be other equivalent forms of the information to be indicated, for example, row vectors can be expressed as column vectors, a matrix can be represented by the transposed matrix of the matrix, and a matrix can also be expressed in the form of a vector or an array, which is a vector or an array It can be formed by connecting the row vectors or column vectors of the matrix to each other. The Kronecker product of two vectors can also be expressed by the product of one vector and the transposed vector of another vector. The technical solutions provided by the embodiments of the present application should be understood to cover various forms. For example, some or all of the features involved in the embodiments of the present application should be understood to cover various manifestations of the feature.

The information to be indicated may be sent together as a whole, or may be divided into multiple sub-information and sent separately, and the sending period and/or sending timing of these sub-information may be the same or different. The specific sending method is not limited in this application. Wherein, the sending period and/or sending timing of these sub-information may be pre-defined, for example, pre-defined according to a protocol, or may be configured by the transmitting end device by sending configuration information to the receiving end device. Wherein, the configuration information may include, for example but not limited to, radio resource control signaling, such as RRC signaling, MAC layer signaling, such as MAC-CE signaling, and physical layer signaling, such as downlink control information (downlink control information, DCI) One or a combination of at least two of them.

Sixth, the definitions listed in this application for many characteristics (such as Kronecker product, CSI, PMI, frequency domain unit, dual domain compression, space domain vector, frequency domain vector, and CSI-RS resources, etc.) are only used to To explain the function of this feature by way of example, the details can refer to the prior art.

Seventh, in the embodiments shown below, the first, second, third, fourth, and various numerical numbers are only for the convenience of description, and are not intended to limit the scope of the embodiments of the present application. For example, distinguish between different thresholds and different instructions.

Eighth, in the embodiments shown below, "pre-defined" can be achieved by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices), This application does not limit its specific implementation. Wherein, "save" may mean saving in one or more memories. The one or more memories may be set separately, or may be integrated in an encoder or decoder, a processor, or a communication device. The one or more memories may also be partly set separately and partly integrated in a decoder, processor, or communication device. The type of memory may be any form of storage medium, which is not limited in this application.

Ninth, the “protocol” involved in the embodiments of the present application may refer to a standard protocol in the communication field, and may include, for example, the LTE protocol, the NR protocol, and related protocols applied in future communication systems, which are not limited in this application.

Tenth, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the relationship of the related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the related object is a "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c may represent: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a , B and c. Among them, a, b and c may be single or multiple.

The vector indicating method for constructing a precoding vector provided by an embodiment of the present application is described in detail below with reference to the drawings.

It should be understood that the method provided by the embodiments of the present application may be applied to a system that communicates through multi-antenna technology, for example, the communication system 100 shown in FIG. 1. The communication system may include at least one network device and at least one terminal device. Multi-antenna technology can communicate between network equipment and terminal equipment.

It should also be understood that the embodiments shown below do not specifically limit the specific structure of the execution body of the method provided in the embodiments of the present application, as long as the program that records the code of the method provided in the embodiments of the present application can be executed to The method provided in the embodiment of the application may be used for communication. For example, the execution body of the method provided in the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call a program and execute the program.

In the following, without loss of generality, taking the interaction between the network device and the terminal device as an example, the vector indication method for constructing a precoding vector provided by an embodiment of the present application will be described in detail.

FIG. 2 is a schematic flowchart of a vector indication method 200 for constructing a precoding vector provided by an embodiment of the present application from the perspective of device interaction. As shown, the method 200 may include steps 210 to 250. The steps of this method are explained in detail below.

In step 210, the terminal device generates first indication information, where the first indication information is used to indicate one or more frequency domain vectors. The one or more frequency domain vectors can be used to construct a precoding vector for one or more frequency domain units in a frequency domain unit group.

Specifically, the one or more frequency domain vectors indicated by the first indication information may be frequency domain vectors determined by the terminal device based on the frequency domain unit group for channel measurement and reported to the network device. In other words, the one or more frequency domain vectors indicated by the first indication information are the frequency domain vectors to be reported, or the selected frequency domain vectors.

Because the length N _f of the frequency domain vector reported based on the frequency domain unit group can be included in the frequency domain unit frequency band from the first frequency domain unit to be reported to the last frequency domain unit to be reported The number of units Q is determined. Therefore, the terminal device may first determine one or more frequency domain unit groups from the reported bandwidth. For each frequency domain unit group, the terminal device may determine the length of the frequency domain vector according to the position of the frequency domain unit to be reported in the frequency domain unit group, and then determine the frequency domain vector to be reported from the corresponding frequency domain vector set.

As mentioned above, the network device may transmit the CSI-RS on the frequency domain unit included in the reported bandwidth. The terminal device may feed back CSI to some or all of the frequency domain units according to the instructions of the network device. The frequency domain unit indicated by the network device and requiring CSI feedback may be referred to as a frequency domain unit to be reported, or a frequency domain unit to be fed back.

For example, the frequency domain unit to be reported may be a subband to be reported indicated by the network device through the csi-ReportingBand described above, or may be a frequency domain unit of other granularity corresponding to the subband to be reported. Here, corresponding to the subband to be reported may refer to that the frequency domain unit to be reported occupies the same frequency band on the frequency domain resource as the subband to be reported, but the reporting granularity may be different. For the description of the frequency domain unit to be reported, please refer to the relevant description in conjunction with FIG. 3 to FIG. 5 below.

In the embodiment of the present application, one frequency domain unit group may include one or more frequency domain units to be reported. The bandwidth occupied by a frequency domain unit group may be part or all of the reported bandwidth. In other words, a frequency domain unit group can be a subset of the reported bandwidth.

For each frequency domain unit group, the terminal device can determine the frequency domain vector to be reported by the method provided in this application. Therefore, after receiving the configuration signaling for reporting the bandwidth, the terminal device may first determine the frequency domain unit group, and then determine the frequency domain vector to be reported based on each frequency domain unit group.

In this embodiment, without loss of generality, taking a frequency domain unit group as an example, the specific process of determining and reporting the frequency domain vector by the terminal device is described in detail.

Optionally, the method 200 further includes: the terminal device determining the frequency domain unit group from the reported bandwidth.

In a possible implementation manner, the terminal device may determine the frequency domain unit group from the reported bandwidth according to a predefined rule. For example, the protocol may predefine rules for determining the frequency domain unit group from the reported bandwidth.

The rule may be, for example, to use all frequency domain units in the reported bandwidth as a group of frequency domain units. After receiving the configuration signaling of the reported bandwidth, the terminal device, as described above in the CSI-FrequencyOccupation, can use all the reported bandwidth as the above-mentioned frequency domain unit group to determine the frequency domain vector to be reported.

Fig. 3 shows an example of the frequency domain unit group and the reported bandwidth. As shown in the figure, FIG. 3 shows the reporting bandwidth including 40 frequency domain units. Each shaded square in the picture

Represents a frequency domain unit to be reported.

The bandwidth occupied by the frequency domain unit group shown in FIG. 3 is the entire bandwidth of the reported bandwidth. That is, the frequency domain unit group includes 40 frequency domain units, of which there are 29 frequency domain units to be reported. For example, the rule may also be that when the number of frequency domain units between two adjacent frequency domain units in the reporting bandwidth is greater than or equal to a predetermined threshold, the two adjacent Between frequency domain units, the reported bandwidth is divided into two parts, which belong to two frequency domain unit groups, respectively. The threshold may be defined in advance, for example, as defined by a protocol.

For example, the rule may also be that the ratio of the number of frequency domain units spaced between two adjacent frequency domain units in the reporting bandwidth to the number of frequency domain units in the reporting bandwidth is greater than or equal to a certain At the threshold value, the reporting bandwidth is divided into two segments from the two adjacent frequency domain units to be reported, which belong to two frequency domain unit groups, respectively. The threshold may be defined in advance, for example, as defined by a protocol.

After receiving the configuration signaling of the reported bandwidth, the terminal device may further determine whether the frequency domain units to be reported in the reported bandwidth are continuous. In the case of poor continuity, the reported bandwidth can be divided into two or more frequency domain unit groups.

FIG. 4 shows an example of dividing the reporting bandwidth into two frequency domain unit groups. As shown in the figure, FIG. 4 shows the reporting bandwidth including 40 frequency domain units. Each shaded square in the picture

Represents a frequency domain unit to be reported.

The bandwidth occupied by the frequency domain unit group shown in FIG. 4 is part of the bandwidth of the reported bandwidth. Fig. 4 shows two frequency domain unit groups. One frequency domain unit group contains 18 frequency domain units, among which there are 12 frequency domain units to be reported; the other frequency domain unit group contains 11 frequency domain units. There are 8 frequency domain units to be reported.

It should be understood that FIG. 4 is only an example. According to the number of frequency domain units spaced between two adjacent frequency domain units to be reported, the reporting bandwidth may also be divided into more frequency domain unit groups.

It should also be understood that the foregoing is merely for ease of understanding, and exemplarily lists several rules that can be used to determine the frequency domain unit group. However, this should not constitute any limitation on this application. For example, the rule may further include that, when the number of frequency domain units spaced between two adjacent frequency domain units to be reported is greater than or equal to a predetermined threshold, from the two adjacent frequency domains to be reported Between units, the reporting bandwidth is divided into two or more sections, and the frequency domain units that do not need to be reported at the head and tail of each section are removed to form two or more frequency domain unit groups. For example, the frequency domain unit group on the left in FIG. 4 may not include the first frequency domain unit that does not need to be reported, and the frequency domain unit group on the right may not include the last frequency domain unit that does not need to be reported. This application does not limit the specific rules for determining frequency domain unit groups.

It should also be understood that FIG. 3 and FIG. 4 are only for the purpose of understanding the relationship between the frequency domain unit group and the reported bandwidth. The granularity of the frequency domain unit in the frequency domain unit group in the figure is the same as the granularity of the reported bandwidth, but this should not constitute the application Any limitation. This application does not limit the relationship between the granularity of frequency domain units in the frequency domain unit group and the granularity of frequency domain units in the reporting bandwidth. For example, the granularity of the frequency domain unit in the frequency domain unit group exemplified below in conjunction with FIG. 5 is different from the granularity of the frequency domain unit in the reporting bandwidth.

In another possible implementation manner, the protocol may be pre-defined, and the reported bandwidth is divided into multiple frequency domain unit groups on average, and each frequency domain unit group includes the same number of frequency domain units.

In yet another possible implementation manner, the terminal device may determine the frequency domain unit group from the reported bandwidth according to the instruction of the network device. For example, the network device may instruct the terminal device through signaling, and the currently configured reporting bandwidth may include several frequency domain unit groups and the frequency domain units included in each frequency domain unit group.

It should be understood that the specific methods listed above for determining the frequency domain unit group are only examples, and should not constitute any limitation to this application. This application does not limit the specific method for determining the frequency domain unit group from the reported bandwidth.

The frequency domain unit to be reported in the reporting bandwidth may be notified by the network device to the terminal device through signaling.

Optionally, the method 200 further includes: Step 220, the terminal device receives second indication information, and the second indication information may be used to indicate the position and number of frequency domain units to be reported in the reporting bandwidth. Correspondingly, the network device sends the second indication information.

In a possible design, the second indication information may be csi-ReportingBand in IE-CSI-ReportConfig. In other words, the network device can indicate the subband to be reported through the csi-ReportingBand. As mentioned above, the csi-ReportingBand can be a bitmap with the same length as the number of subbands included in the reporting bandwidth, so that each indicator bit in the bitmap indicates whether the corresponding subband is the subband to be reported band. Since csi-ReportingBand has been described in detail above, it will not be repeated here for brevity.

If the granularity of the frequency domain unit on which the terminal device reports the first indication information is a subband, the number of frequency domain units to be reported described above may be equal to the number of subbands to be reported indicated by csi-ReportingBand number. If the granularity of the frequency domain unit on which the terminal device reports the first indication information is smaller than the granularity of the subband, the number of frequency domain units to be reported as described above may be greater than the number of subbands indicated by csi-ReportingBand . For example, the number of frequency domain units to be reported may be an integer multiple of the number of subbands to be reported indicated by csi-ReportingBand. In other words, the number of resource blocks (RBs) contained in each subband may be an integer multiple of the number of RBs contained in each frequency domain unit. If the ratio of the granularity of the subband to the granularity of the frequency domain unit on which the first indication information is reported is recorded as α, α may be an integer greater than or equal to 1.

It should be noted that all the frequency domain resources corresponding to the subbands to be reported indicated by the csi-ReportingBand need to report CSI. Therefore, the network device indicates the subband to be reported through csi-ReportingBand, which also indicates the frequency domain unit to be reported. It is just that the granularity of the frequency domain unit on which the terminal device reports the first indication information may be a subband, or may be other granularity. In other words, regardless of whether the frequency domain unit indicated by the second indication information is the same as the frequency domain unit based on which the first indication information is reported above, the terminal device can determine to be reported according to the second indication information Position and number of frequency domain units. In the embodiment of the present application, for ease of understanding, the granularity of the frequency domain unit to be reported and the granularity of the frequency domain unit on which the first indication information is reported are defined as the same granularity.

FIG. 5 shows an example of second indication information, reporting bandwidth, and frequency domain unit group. As shown in the figure, the second indication information may indicate the number and position of subbands to be reported through a bitmap. The reporting bandwidth shown in the figure may include at least 10 subbands, and the ellipsis in the figure may indicate one or more subbands. Each subband may correspond to an indicator bit in the bitmap. The subband corresponding to the bit with the indication bit set to "1" may be the subband to be reported. The frequency domain unit group may occupy part or all of the reported bandwidth. The frequency domain unit group shown in the figure occupies part of the reported bandwidth. The granularity of the frequency domain units in the frequency domain unit group may be smaller than the subband. The granularity of the frequency domain unit shown in the figure is 1/4 of the subband granularity. In other words, the number of RBs included in each subband may be 4 times the number of RBs included in each frequency domain unit to be reported. That is, α=4. In this frequency domain unit group, the number Q of frequency domain units included in the bandwidth occupied by the first frequency domain unit to be reported to the last frequency domain unit to be reported can be calculated by the formula Q=α(N _2- N ₁ -1)+M ₁ +M _{2 is} determined. Where N ₂ represents the sequence number of the subband to be reported corresponding to the last frequency domain unit in the frequency domain unit group to be reported in the reporting bandwidth, and N ₁ represents the first frequency to be reported in the frequency domain unit group The sequence number M _{1 of the} sub-band to be reported corresponding to the domain unit in the reporting bandwidth indicates the number of frequency-domain units to be reported contained in the first sub-band to be reported, and M ₂ indicates that the last sub-band to be reported contains The number of frequency domain units to be reported; N ₁ ≥1, N ₂ ≥1, M ₁ ≥1, M ₂ ≥1, and N ₁ , N ₂ , M ₁ and M ₂ are all integers.

Here, M ₁ and M ₂ are introduced because it is considered that when the first frequency domain unit to be reported happens to be the first subband in the reported bandwidth, or the last frequency domain unit to be reported happens to be the last subband in the reported bandwidth However, the ratio of the granularity of the first subband or the last subband of the reported bandwidth to the granularity of the frequency domain unit on which the first indication information is reported may not be α. For example, M ₁ ≤ α and M ₂ ≤ α.

If M ₁ =α and M ₂ =α, in the reporting bandwidth shown in FIG. 5, N ₂ =5, N ₁ =1, and Q=20.

It should be understood that the calculation formula for determining the Q value shown above is only an example, and should not constitute any limitation to this application. For example, the Q value can also be determined by the sequence number N ₂ ′ of the last frequency domain unit to be reported in the frequency domain unit group and the sequence number N ₁ ′ of the first frequency domain unit to be reported, for example, Q=N ₂ ′-N ₁ '+1. _{_{Wherein, N 1 '≥1, N 2}} ' ≥1, and N ₁ 'and N _2' are integers. It can be understood that when the granularity of the frequency domain unit is the same as the granularity of the sub-band, α=1, that is, N ₁ ′=N ₁ , N ₂ ′=N ₂ , and Q=N ₂ -N ₁ +1. For example, in the frequency domain unit group shown in FIG. 3, the Q value is 38. For another example, in the two frequency domain unit groups shown in FIG. 4, Q values are 17 and 10, respectively.

It should also be understood that FIG. 5 is only an example for ease of understanding, and should not constitute any limitation to this application. In this application, the relationship between the granularity of the frequency domain unit to be reported, the granularity of the frequency domain unit to be reported and the granularity of subbands, the relationship between the frequency domain unit group and the reported bandwidth, and the number of subbands (ie, bits) included in the reported bandwidth The length of the picture) is not limited.

It should also be understood that the numbering of each subband in the bandwidth occupied by the frequency domain of the reported bandwidth shown in FIG. 5 is only an example, and should not constitute any limitation to this application. For example, each subband in the bandwidth occupied by the frequency domain of the reported bandwidth may also be numbered from 1 or from other values. Regardless of the numbering, the number of subbands contained in the bandwidth from the first subband to be reported to the last subband to be reported remains the same, or from the first subband to be reported to the last subband to be reported The number Q of frequency domain units contained in the bandwidth occupied by the band does not change.

It should also be understood that the csi-ReportingBand in the IE-CSI-ReportConfig listed above is only an example of the second indication information, and should not constitute any limitation to this application. This application does not exclude the possibility of indicating the number and location of frequency domain units to be reported through other existing signaling or through newly added signaling. Moreover, when the number and location of frequency domain units to be reported are indicated by existing signaling or newly added signaling, it may be indicated based on the same or different granularity as the frequency domain unit to be reported. This application does not limit this.

As mentioned above, the length N _{f of the} frequency domain vector can be from the number of frequency domain units in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group determine.

Optionally, N _f =Q.

A set of frequency domain vectors of different lengths can be predefined in the frequency domain vector set. When the terminal device determines the Q value, it can directly select a frequency domain vector with a length equal to the Q value from the frequency domain vector set for reporting.

For example, in the frequency domain unit group shown in FIG. 3, the Q value is 38, and a frequency domain vector with a length of 38 can be selected. For another example, in the frequency domain unit group shown in FIG. 4, the Q values are 17 and 10, respectively, and frequency domain vectors with lengths of 17 and 10 can be selected. As another example, in the frequency domain unit group shown in FIG. 5, the Q value is 20, and a frequency domain vector with a length of 20 can be selected.

Optionally, N _f >Q.

In the frequency domain vector set, only a set of frequency domain vectors of a certain length may be defined. When the terminal device determines the Q value, it can select a frequency domain vector with a length greater than the Q value from the set of frequency domain vectors.

For example, frequency domain vectors with lengths {4, 8, 12, 24, 48} can be defined in the frequency domain vector set. When the terminal device determines that the Q value according to the position of the frequency domain unit to be reported in the frequency domain unit group does not belong to the set of lengths listed above, it may select a frequency domain vector whose length is greater than the Q value.

For example, in the frequency domain unit group shown in FIG. 3, the Q value is 38, and a frequency domain vector with a length of 48 can be selected. For another example, in the frequency domain unit group shown in FIG. 4, Q values are 17 and 10, respectively, and frequency domain vectors with lengths of 24 and 12 can be selected. As another example, in the frequency domain unit group shown in FIG. 5, the Q value is 20, and a frequency domain vector with a length of 24 can be selected.

It should be understood that the Q values and the lengths of the frequency domain vectors listed above are only examples for easy understanding, and should not constitute any limitation to this application. In addition, when the granularity of the frequency domain unit in the reported bandwidth indicated by the second indication information is different from the granularity of the frequency domain unit in the frequency domain unit group on which the first indication information is reported, the Q value may be defined as The granularity of the reported frequency domain unit corresponds to the granularity of the frequency domain unit in the reporting bandwidth configured by the signaling (for example, the aforementioned subband). This application does not limit this.

In the following, for convenience of explanation, it is assumed that the granularity of the frequency domain unit in reporting bandwidth is the same as the granularity of the frequency domain unit on which the first indication information is reported. For example, all are subbands. However, it should be understood that this should not constitute any limitation on this application.

After determining the length of the frequency domain vector, the terminal device can further determine the frequency domain vector to be reported.

Optionally, the terminal device separately determines the frequency domain vector to be reported based on each transmission layer. That is to say, the frequency domain vectors used to determine the precoding vectors of the frequency domain units on each transmission layer may be independent of each other.

In one implementation, the terminal device may perform channel measurement based on the reference signal received on the frequency domain unit group, such as CSI-RS, to determine each transmission layer and each frequency domain in the frequency domain unit group The precoding vector corresponding to the unit. It should be understood that the specific method for determining the precoding vector corresponding to each frequency domain unit on each transmission layer based on channel measurement can refer to the prior art, and for the sake of brevity, a detailed description of the specific process is omitted here.

The terminal device can construct a space-frequency matrix corresponding to the transmission layer according to the precoding vectors of each frequency-domain unit on the same transmission layer, and can determine the frequency-domain vector to be reported by performing DFT of the space-frequency matrix on the space-frequency and frequency-domain. The spatial and frequency domain DFT of the spatial frequency matrix can be realized by the formula C=B _s ^H H _r B _f , for example. Where H _r represents a space-frequency matrix constructed by the precoding vectors corresponding to each frequency domain unit on the r-th (0≤r≤R-1) transmission layer in the R transmission layers. B _s represents a matrix constructed by a group of space domain vectors in a predefined set of space domain vectors. B _f represents a matrix constructed by a group of frequency domain vectors in a set of predefined frequency domain vectors. In the embodiment of the present application, the length of each frequency domain vector in the frequency domain vector set may be determined by the method described above. C represents the coefficient matrix obtained by DFT.

It should be noted that this is only for ease of understanding. Taking a space domain vector group in the space domain vector set and a frequency domain vector group in the frequency domain vector set as examples, it is illustrated that the terminal device performs space and frequency domain DFT on the space frequency matrix The specific process of determining the frequency domain vector and the space domain vector and the weighting coefficient described later. When the spatial domain vector set includes multiple spatial domain vector groups or the frequency domain vector set includes multiple frequency domain vector groups, the terminal device performs spatial and frequency domain DFT on the spatial frequency matrix to determine the frequency domain vector and the spatial domain vector described later The specific process of the weighting coefficient is similar to that of the specific process. For details, please refer to the prior art. For brevity, a detailed description of the specific process is omitted here.

The terminal device may determine one or more strong columns, for example, M _r , from the coefficient matrix C. M _r ≥1 and an integer. The terminal device may determine, for example, one or more columns with a larger sum of squares of the modulus according to the magnitude of the square sum of the modulus of each column element in the coefficient matrix C. The stronger the coefficient matrix C M _r of columns can be used to determine a plurality of frequency domain or frequency-domain vectors in the vector set selected. For example, the numbers of the strong M _r columns in the coefficient matrix C may be the numbers of the selected M _r column vectors in the matrix B _f constructed by the frequency domain vector set. Therefore, the frequency domain vector reported for the rth transmission layer can be determined based on the space frequency matrix corresponding to the rth transmission layer.

The number of frequency domain vectors to be reported may be indicated by the network device through signaling, or may be determined and reported by the terminal device by itself, or may be defined in advance, such as a protocol definition. This application does not limit this.

It should be noted that when the number of frequency domain units to be reported is less than the length N _{f of the} frequency domain vector, the space frequency matrix may be filled with zeros. For example, if the number of frequency domain units to be reported is N _sb , N _f >N _sb ≥1 and an integer. Then, the dimension of the space-frequency matrix is N _t ×N _sb , and the matrix can be filled with zero elements of N _f -N _sb columns to obtain a matrix of dimension N _t ×N _f for DFT. The terminal device and the network device may be pre-agreed N _f -N _sb zero element column filled before N _sb columns or after space-frequency matrix. For example, the terminal device may fill the N _f -N _sb column zero elements in the N _sb column of the space frequency matrix, and after receiving the first indication information fed back by the terminal device, the network device may recover the first indication information The first N _sb columns of the matrix with the dimension N _t ×N _f are extracted to obtain the space-frequency matrix with the dimension N _t ×N _sb .

It should be understood that the method of determining the frequency domain vector to be reported by the terminal device in the case of N _f >N _sb listed here is only an example, and should not constitute any limitation to this application. The specific method for the terminal device to determine the frequency domain vector to be reported and the specific method for the network device to restore the precoding vector are internal implementation behaviors, which are not limited in this application.

After determining the frequency domain vector to be reported, the terminal device may further generate indication information of the frequency domain vector to be reported. For example, the terminal device may indicate the frequency domain vector to be reported by the index of the frequency domain vector combined in the frequency domain vector set, or may indicate each frequency domain vector by the index of each frequency domain vector to be reported, or by bit The figure indicates the frequency domain vector to be reported, which is not limited in this application. The specific method for the terminal device to report the frequency domain vector can refer to the prior art. For example, reference can be made to the specific method for the terminal device to report the air domain vector in the feedback mode of the type II codebook.

Further, the first indication information can also be used to indicate one or more airspace vectors.

The space domain vector and weighting coefficient reported for the rth transport layer can be determined by the coefficient matrix C obtained by the above DFT. For example, the terminal device may determine one or more strong rows from the coefficient matrix C to determine one or more space domain vectors, for example, L _r , L _r ≥ 1 and an integer. The sequence numbers of the strong L _r rows in the coefficient matrix C may be the sequence numbers of the selected L _r column vectors in the matrix U _s constructed by the spatial domain vector set.

The number of airspace vectors to be reported may be indicated by the network device through signaling, or may be determined and reported by the terminal device by itself, or may be defined in advance, such as protocol definition. This application does not limit this.

After determining the airspace vector to be reported, the terminal device may further generate indication information of the airspace vector to be reported. The terminal device may indicate the airspace vector to be reported by the index of the airspace vector combined in the airspace vector set, or may indicate each airspace vector by the index of each airspace vector to be reported, and may also indicate the to be reported by the bitmap. The airspace vector of this is not limited in this application. The specific method of reporting the airspace vector by the terminal device can refer to the prior art. For example, reference may be made to the specific method of reporting the airspace vector by the terminal device in the feedback method of the type II codebook.

It should be understood that the one or more space domain vectors may be determined by the terminal device based on channel measurement, or may be pre-configured. For example, the protocol may predefine that some or all of the space domain vectors in the space domain vector set are used to construct the space frequency matrix; Alternatively, it may also be determined by the network device, for example, the network device may determine one or more airspace vectors according to the reciprocity of the uplink and downlink channels. This application does not limit the determination method of the airspace vector.

Further, the first indication information can also be used to indicate one or more weighting coefficients.

In addition, the stronger M _r columns and the stronger L _r rows in the coefficient matrix C can construct a coefficient matrix C′ with dimensions L _r ×M _r . The L _r ×M _r elements in the coefficient matrix C′ are all weighting coefficients. Wherein the first row _r m L _r L _r row elements of the m-th spatial weighting coefficient vectors and space frequency components of the matrix _r of frequency-domain vectors constructed. _{_{_{Wherein, 0≤l r ≤L r -1,0≤m r ≤M}}} r -1, l r and m _r are integers.

It should be understood that the coefficient matrix C′ may include one or more elements whose amplitude quantization value is zero. For one or more elements whose quantized value of the amplitude is zero, the terminal device may not report.

Still further, the number of reported weighting coefficients may be pre-configured, for example, pre-defined, such as protocol definition, or indicated by the network device through signaling. This application does not limit this. For example, reporting the number of weighting coefficients may be denoted as _{_{_{K r, 1≤K r ≤L r ×}}} M r, and K _r is an integer. The K _r weighting coefficients may be a subset of L _r ×M _r elements in the above coefficient matrix C′. In other words, a spatial vector _r L hereinabove and M _r of said frequency-domain vectors constructed L _{_r} × M _r null frequency component of the matrix can be used for part or all of the weighted sum, to obtain the first r Weighting coefficients corresponding to each transport layer.

It should be understood that, since the coefficient matrix C′ may include one or more elements with a small amplitude, for example, the quantized value of the amplitude is zero, or close to zero, the number of weighting coefficients actually reported by the terminal device may be K _r , Can also be less than K _r , which is not limited in this application.

After determining the weighting coefficient to be reported, the terminal device may further generate indication information of the weighting coefficient to be reported. The terminal device may indicate the weighting coefficient in a normalized manner, for example, which is not limited in this application. The specific method for the terminal device to report the weighting coefficient can refer to the prior art. For example, reference can be made to the specific method for the terminal device to report the weighting coefficient in the feedback mode of the type II codebook.

It should be understood that the foregoing is only for ease of understanding. Taking the rth transmission layer as an example, the specific process of determining the space domain vector, the frequency domain vector, and the corresponding weighting coefficient by the terminal device is described in detail. However, this should not constitute any limitation on this application. The specific method by which the terminal device determines the space domain vector, the frequency domain vector, and the corresponding weighting coefficient is not limited to the above. For example, the terminal device can also use existing estimation algorithms, such as multiple signal classification algorithm (multiple signal classification classification algorithm, MUSIC), Bartlett algorithm or rotation invariant subspace algorithm (estimation of signature, parameters, via rotation, variation in technology, algorithm, algorithm). , ESPRIT), etc., to determine the space domain vector, frequency domain vector and the corresponding weighting coefficient.

Optionally, the terminal device determines one or more frequency domain vectors that can be shared based on the R transmission layers. That is, the frequency domain units used to determine the precoding vectors of the frequency domain units on each transmission layer may be common. The frequency domain vectors determined for any two transmission layers may be the same. For example, M (M≥1 and an integer) frequency domain vectors.

When R transmission layers share one or more frequency domain vectors, the terminal device may determine one or more frequency domain vectors according to the space-frequency matrices corresponding to the R transmission layers respectively. The specific method for the terminal device to determine the frequency domain vector to be reported based on the R transmission layers may be similar to that described above, or may refer to the prior art. For brevity, I will not repeat them here.

The R transmission layers may share one or more space domain vectors. For example, L (L≥1 and an integer) space vectors. The terminal device may determine L space domain vectors according to the space frequency matrix corresponding to the R transmission layers. The specific method for the terminal device to determine the airspace vector to be reported based on the R transmission layers may be similar to that described above, or may refer to the prior art. For brevity, I will not repeat them here.

The specific method for the terminal device to determine the weighting coefficient is similar to that described above.

In addition, the number of reported weighting coefficients can be configured in advance. Since this has been explained in detail above, for the sake of brevity, it will not be repeated here.

Optionally, the terminal device determines one or more frequency domain vectors based on each space domain vector. That is, the frequency domain vectors used to construct the space frequency component matrix with different space domain vectors may be independent of each other.

The terminal device may determine one or more frequency domain vectors according to each space domain vector. For example, the terminal device may determine one or more frequency domain vectors corresponding to each space domain vector by performing space domain and frequency domain DFT on the space frequency matrix. The terminal device performs DFT of the space and frequency domains on the space-frequency matrix by, for example, the formula C=u _s ^H H _r B _f . Where u _s represents a space domain vector, and the stronger frequency domain vector or vectors determined therefrom are frequency domain vectors corresponding to the space domain vector u _s . The specific method for the terminal device to determine the strong frequency vector or vectors is similar to that described above, and for the sake of brevity, it is not repeated here.

The airspace vector may be determined by the terminal device based on channel measurement. Optionally, the first indication information is also used to indicate one or more airspace vectors. The airspace vector may also be indicated by the network device, or it may be pre-defined, which is not limited in this application.

Still further, the terminal device can also individually determine and report the broadband amplitude coefficient for each spatial domain vector. In this case, the first indication information may also be used to indicate the broadband amplitude coefficient of each spatial domain vector in one or more spatial domain vectors. The specific method for the terminal device to determine the broadband amplitude coefficient for each spatial domain vector can refer to the prior art, and for the sake of brevity, it will not be repeated here.

It should be understood that the application does not limit the correspondence between the frequency domain vector and the space domain vector, the correspondence relationship between the frequency domain vector and the transmission layer, and the specific determination method of the frequency domain vector. This application does not limit the specific method for the terminal device to report the space domain vector, frequency domain vector, and weighting coefficient. This application does not limit the number of spatial domain vectors, frequency domain vectors, and weighting coefficients reported by the terminal device.

Based on the method described above, the terminal device may determine and generate first indication information to be reported.

However, in some cases, the distribution of frequency domain units to be reported in the reporting bandwidth is not continuous. For example, the frequency domain units to be reported are sparsely distributed in the reporting bandwidth. In this case, the frequency domain unit to be reported may not have good frequency domain continuity. If the dual domain compression method described above is still used to feed back the precoding vector, it may not be able to communicate well with Downstream channel adaptation. In addition, if the number of frequency domain units to be reported is small, the feedback method based on the type II codebook is reported separately for each frequency domain unit, which does not cause a large feedback overhead. Therefore, before determining the first indication information, the terminal device may further determine whether to use the dual-domain compression method to feed back the precoding vector.

Optionally, step 210 specifically includes the terminal device determining the first indication information when the frequency domain unit to be reported in the frequency domain unit group meets the preset condition.

That is to say, when determining that the frequency domain unit to be reported satisfies the preset condition, the terminal device uses a dual-domain compression method to feed back the precoding vector, and then determines the first indication information.

For example, the preset condition may be: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, x is a predefined value, and 0<x≦1. In other words, the ratio of the number of frequency domain units to be reported in the frequency domain unit group to Q is greater than or equal to x. Optionally, x=0.5.

Among them, the Q frequency domain units are composed of all frequency domain units in the first frequency domain unit to be reported in the frequency domain unit group to the last frequency domain unit to be reported, and may occupy part or all of the frequency domain unit group bandwidth. When the frequency domain unit to be reported occupies a large proportion in the Q frequency domain units, it may be considered that the distribution of the frequency domain unit to be reported is continuous, and the first indication information may be determined based on the method described above .

Taking FIG. 3 as an example, the number of frequency domain units to be reported in the frequency domain unit group shown in FIG. 3 is 29, the Q value is 38, and 29>0.5×38, so the frequency domain units to be reported meet the preset conditions , The terminal device may determine the first indication information based on the method described above.

It should be understood that the value of x above is only an example, and should not constitute any limitation to this application. This application does not limit the value of x.

For another example, the preset condition may be: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined first threshold.

That is, when the number of frequency domain units to be reported in the frequency domain unit group is large, the first indication information may be determined based on the method described above.

For another example, the preset condition may be: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined second threshold, and the Q value is greater than or equal to a predefined third threshold.

That is, when the number of frequency domain units to be reported in the frequency domain unit group is large and the Q value is large, the first indication information may be determined based on the method described above. Wherein, the second threshold and the third threshold may be independent of each other, and the size relationship between the second threshold and the third threshold is not limited in this application.

For another example, the preset condition may be: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined fourth threshold, and the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to y ×Q, 0<y≤1, y is a predefined value.

That is, when the number of frequency domain units to be reported in the frequency domain unit group is large and the proportion in Q frequency domain units is large, the first indication information may be determined based on the method described above.

For another example, the preset condition may be that the number of frequency domain units that do not need to be reported in the frequency domain unit group is less than or equal to a predefined fifth threshold, and the Q value is greater than or equal to a predefined sixth threshold.

That is, when the number of frequency domain units that do not need to be reported in the frequency domain unit group is small and the Q value is large, the first indication information may be determined based on the method described above.

For another example, the preset condition may be: the number of frequency domain units that do not need to be reported in the frequency domain unit group is less than or equal to a predefined seventh threshold, and the number of frequency domain units that do not need to be reported are less than or equal to z×Q, 0 <z≤1, z and the sixth threshold are predefined values.

That is, when the number of frequency domain units that do not need to be reported in the frequency domain unit group is small, and the proportion in the Q frequency domain units is small, it can be considered that most frequency domain units in the Q frequency domain units are Is the frequency domain unit to be reported, the first indication information may be determined based on the method described above.

For another example, the preset condition may be that the number of frequency domain units in the frequency domain unit group that does not need to be reported is less than or equal to the eighth threshold.

That is, when the number of frequency domain units that do not need to be reported in the frequency domain unit group is small, it can be considered that most of the frequency domain units in the frequency domain unit group are frequency domain units to be reported, so the frequency to be reported can be considered The distribution of the domain units in the frequency domain unit group is relatively continuous, and the first indication information may be determined based on the method described above.

It should be understood that the foregoing is merely for ease of understanding, and a plurality of predefined values are shown, such as the first threshold to the seventh threshold and x, y, z, and so on. The predefined values may be independent of each other, and the specific value of each predetermined value is not limited in this application.

It should also be understood that the foregoing is merely for ease of understanding, and shows various preset conditions for determining whether to feed back the precoding vector based on the dual-domain compression mode. However, this should not constitute any limitation on this application. When the protocol defines a preset condition as a criterion for determining whether to use the dual-domain compression method to feed back the precoding vector, the terminal device may determine the feedback method based on the preset condition, and the network device may also be based on the same preset condition. The precoding vector is restored according to the received feedback.

In step 230, the terminal device sends the first indication information. Correspondingly, the network device receives the first indication information.

Specifically, the first indication information may be PMI, or some information elements in the PMI, or other information. This application does not limit this. The first indication information may be carried in one or more messages in the prior art and sent by the terminal device to the network device, or may be carried in one or more messages newly designed in the present application and sent by the terminal device to the network device. For example, the terminal device may send the first indication information to the network device through physical uplink resources, such as a physical uplink shared channel (physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH), to facilitate the network device The precoding vector is restored based on the first indication information.

The specific method for the terminal device to send the first indication information to the network device through the physical uplink resource may be the same as that in the prior art, and for the sake of brevity, a detailed description of its specific process is omitted here.

In step 240, the network device determines one or more frequency domain vectors according to the first indication information.

The network device may determine one or more frequency domain vectors fed back by the terminal device according to the first indication information.

The method for the network device to determine one or more frequency domain vectors according to the first indication information corresponds to the method for the terminal device to determine the frequency domain vectors.

If the terminal device reports one or more frequency domain vectors based on each transmission layer, the network device may separately determine one or more frequency domain vectors corresponding to each transmission layer. If the terminal device reports one or more frequency domain vectors based on the R transmission layers, the terminal device may determine one or more frequency domain vectors that can be shared by the R transmission layers. If the terminal device reports one or more frequency domain vectors based on each space domain vector, the network device may separately determine one or more frequency domain vectors corresponding to each space domain vector.

The method for the terminal device to determine one or more frequency domain vectors according to the first indication information corresponds to the method for the indication information for the frequency domain vectors of the terminal device.

If the terminal device uses a combined index of frequency domain vectors to indicate the selected frequency domain vector, the network device may determine one or more frequency domain vectors indicated by the terminal device from the frequency domain vector set according to the index. If the terminal device uses the index of each frequency domain vector to indicate the selected frequency domain vector, the network device may determine one or more frequency domain vectors indicated by the terminal device from the set of frequency domain vectors according to each index. If the terminal device uses a bitmap to indicate the frequency domain vector, the network device may determine one or more frequency domain vectors indicated by the terminal device according to the correspondence between the bitmap and each frequency domain vector in the frequency domain vector set.

Further, the first indication information can also be used to indicate one or more space domain vectors and one or more weighting coefficients. The network device may determine one or more airspace vectors and one or more weighting coefficients according to the first indication information. Similarly, the method for the network device to determine the airspace vector according to the first indication information corresponds to the method for the terminal device to generate the indication information for the airspace vector. The method by which the network device determines the weighting coefficient according to the first indication information corresponds to the method by which the terminal device generates the indication information of the weighting coefficient. Since the network device determines the space vector and the weighting coefficient according to the first indication information, reference may be made to the prior art. For brevity, the detailed description of the specific process is omitted here.

Optionally, step 240 specifically includes: the network device determining one or more frequency domain vectors according to the first indication information when the frequency domain unit to be reported in the frequency domain unit group meets a preset condition.

The network device determines whether the frequency domain unit to be reported in the frequency domain unit group meets the preset condition is similar to the specific process of determining whether the frequency domain unit to be reported in the frequency domain unit group meets the preset condition in step 210 above, For brevity, I will not repeat them here.

The preset condition may be pre-agreed by the terminal device and the network device, or pre-defined by the protocol. The network device and the terminal device may determine whether the frequency domain unit to be reported meets the preset condition based on the same preset condition.

Optionally, the method further includes step 250, the network device determines the precoding vectors of one or more frequency domain units in the frequency domain unit group.

The network device may determine the precoding vector of one or more frequency domain units in the frequency domain unit group according to the predetermined frequency domain vector, space domain vector and weighting coefficient, for example, as determined in step 240 above.

If the terminal device feeds back the space domain vector, the frequency domain vector, and the weighting coefficient for each of the R transmission layers, respectively. For the rth transmission layer, the network device may determine L _r space domain vectors, M _r frequency domain vectors, and L _r ×M _r weighting coefficients according to the first indication information. Then, the network device may determine the precoding vector on the rth transmission layer and the jth frequency domain unit in the frequency domain unit group based on the following formula:

When the number of polarization directions is 1,

When the number of polarization directions is 2,

_Wherein, u _{l, r} represents based on L _r a spatial vector r th transport layer feedback in the l th spatial _vector, v _{m, r} denotes based on the r th transport layer feedback M _r frequency-domain vectors m frequency domain vectors, v _m,r (j) represents the jth element in v _m,r ,

Represents the conjugate of v _m,r (j);

Represents the normalization coefficient,

a _l,m,r represents the weighting coefficients corresponding to the lth space domain vector u _l,r and the mth frequency domain vector v _m,r based on the r th transmission layer feedback; a _l,m,r,1 Represents the weighting coefficients corresponding to the lth space domain vector u _l and the mth frequency domain vector v _{m in the} first polarization direction based on feedback from the rth transmission layer; a _{l, m, r, 2} means based on the rth The weighting coefficients corresponding to the l-th space domain vector u _l,r and the m-th frequency domain vector v _{m,r in the} second polarization direction fed back by the transmission layer.

Wherein, each weighting coefficient may include an amplitude coefficient and a phase coefficient. E.g,

p _l,m,r represents the amplitude coefficient,

Represents the phase coefficient. The relationship between a _l,m,r,1 and a _l,m,r,2 and amplitude coefficient and phase coefficient respectively is similar. For brevity, I will not list them one by one here.

In addition, as mentioned above, the number of weighting coefficients fed back by the terminal device based on the rth transmission layer may not necessarily be the sum of L _r ×M _r , that is, it may not necessarily be combined with the above L _r space vectors The L _r ×M _r space frequency component matrices constructed by the M _r frequency domain vectors correspond. However, it may only correspond to a part of the space-frequency component matrixes among the L _r ×M _r space-frequency component matrixes. In this case, the above formula can be further simplified, or the partial unreported weighting coefficient in the above formula can be treated as a weighting coefficient with zero amplitude. Since the method for the network device to restore the precoding vector is an internal implementation behavior of the device, the present application does not limit the specific method for the network device to restore the precoding vector.

If R transmission layers share one or more space domain vectors and one or more frequency domain vectors, such as L space domain vectors and M frequency domain vectors, the above is used to determine the rth transmission layer and the frequency domain unit group The formula of the precoding vector of the jth frequency domain unit in can be simplified to:

When the number of polarization directions is 1,

When the number of polarization directions is 2,

Where u _l represents the lth space domain vector among the L space domain vectors, and v _m represents the _mth frequency domain vector among the M frequency domain vectors. v _m (j) represents the jth element in v _m ,

Represents the conjugate of v _m (j).

If the terminal device feeds back one or more frequency domain vectors based on each space domain vector, the above formula for determining the precoding vectors on the rth transmission layer and the jth frequency domain unit in the frequency domain unit group can be deformed for:

When the number of polarization directions is 1,

When the number of polarization directions is 2,

Where u _l,r represents the lth space domain vector among the L _r space domain vectors fed back based on the rth transport layer,

Represents the m _l frequency domain vector among the M _{l, r} (M _{l, r} ≥ 1 and integer) frequency domain vectors corresponding to the _l space domain vector based on the r th transmission layer feedback,

Express

The conjugate of the jth element in

Represents the weighting coefficients corresponding to the _lth space domain vector and the _ml frequency domain vector based on the rth transmission layer feedback;

R represents transmission based on the feedback layer, the first polarization direction and the l-th spatial vectors _l and m frequency domain vectors corresponding weighting coefficient;

R represents transmission based on the feedback layer, the second polarization direction and the l-th spatial vectors _l and m frequency domain vectors corresponding weighting coefficient.

If the terminal equipment separately reports the broadband amplitude coefficient of the space domain vector and the weighting coefficient of the space frequency component matrix, the above is used to determine the precoding vector on the rth transmission layer and the jth frequency domain unit in the frequency domain unit group The formula can also be transformed into:

When the number of polarization directions is 1,

When the number of polarization directions is 2,

among them,

Represents the broadband amplitude coefficient corresponding to the lth space domain feedback based on the rth transmission layer; p _l,m,r represents the lth space domain vector and mth frequency domain based on the rth transmission layer feedback Vector corresponding

Represents the phase coefficient corresponding to the lth space domain vector and the mth frequency domain vector based on the rth transmission layer feedback;

Represents the broadband amplitude coefficient corresponding to the lth space domain vector in the first polarization direction based on the rth transmission layer feedback; p _l,m,r,1 represents the first pole based on the rth transmission layer feedback Amplitude coefficients corresponding to the lth space domain vector and the mth frequency domain vector in the normalization direction;

Represents the phase coefficients corresponding to the lth space domain vector and the mth frequency domain vector in the first polarization direction based on the rth transmission layer feedback;

Represents the broadband amplitude coefficient in the second polarization direction based on the r-th transmission layer feedback; p _l,m,r,2 represents the second polarization direction and the l-th space domain based on the r-th transmission layer feedback The amplitude coefficient corresponding to the vector and the m-th frequency domain vector;

Represents the phase coefficients corresponding to the lth space domain vector and the mth frequency domain vector in the second polarization direction based on the rth transmission layer feedback.

It should be understood that the formulas listed above for recovering the precoding vectors of each frequency domain unit are only examples, and should not constitute any limitation to this application. Those skilled in the art, based on the same concept, can perform equivalent transformation or replacement on the above formula to recover the precoding vector of each frequency domain unit.

It should also be understood that the method for calculating the precoding vector of each frequency domain unit based on the formula listed above is only an example, and should not constitute any limitation to this application. The network device may also construct a space-frequency matrix based on the space-domain vector, frequency-domain vector, and weighting coefficients, such as

Furthermore, the precoding vector of each frequency domain unit is determined. In addition, the calculation formula of the space frequency matrix shown here only shows the case where R transmission layers share L space domain vectors and M frequency domain vectors, and the above various possible situations can be modified on this basis. For the sake of brevity, I will not list them here.

In the embodiment of the present application, the terminal device determines the length of the frequency domain vector based on the number of frequency domain units included in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit in the frequency domain unit group, The selected frequency domain vector can maintain the continuity of the frequency domain, and can more accurately reflect the changing law of the channel in the frequency domain. Therefore, a higher feedback accuracy can be ensured, so that the precoding vector recovered by the network device based on the feedback of the terminal device can be better adapted to the channel, which is beneficial to improve the subsequent data transmission performance. On the contrary, if the length of the frequency domain vector is determined only according to the number of frequency domain units to be reported, the selected frequency domain vector does not really simulate the changing law of channels on consecutive frequency domain units, so It cannot accurately reflect the changing law of the channel in the frequency domain, and the feedback accuracy is affected.

In addition, one or more frequency domain vectors are used to describe the different changes of the channel in the frequency domain, and the linear superposition of the one or more frequency domain vectors is used to simulate the changes of the channel in the frequency domain, and the frequency domain is fully tapped. The relationship between the units utilizes the continuity of the frequency domain, and uses fewer frequency domain vectors to describe the changing law of the channel on multiple frequency domain units. Compared with the existing type II codebook feedback method, there is no need to independently report the subband superposition coefficients based on each subband, and when the number of subbands increases, the feedback overhead will not increase exponentially. Therefore, the feedback overhead can be greatly reduced.

It should be understood that in the vector indication manner provided for constructing the precoding vector provided above, the method for determining the length of the frequency domain vector is not limited to one transmission layer or one polarization direction. The length of the frequency domain vector determined by the terminal device for a group of frequency domain units may be applicable to one or more transmission layers and one or more polarization directions. In other words, for a frequency domain unit group, the terminal device can determine the length of the frequency domain vector only once, and then perform dual domain compression to determine the frequency domain vector to be reported. This application does not limit the number of transmission layers and the number of polarization directions.

As mentioned above, when the continuity of the frequency domain units to be reported is not very good, or the frequency domain units to be reported are few, the feedback of the precoding vector by dual domain compression is not The feedback overhead must be reduced, and feedback accuracy may be affected. Therefore, the feedback method for dual-domain compression provided above can coexist with other feedback methods, and the terminal device can determine which method to use to feed back the precoding vector to the network device based on the number and location of frequency domain units to be reported.

FIG. 6 is a schematic flowchart of a method 600 for reporting PMI provided by another embodiment of the present application from the perspective of device interaction. As shown, the method 600 may include steps 610 to 630. The steps of method 600 are described in detail below.

In step 610, the terminal device generates PMI.

Among them, the frequency domain unit group has been described in detail in the method 200 above, and for the sake of brevity, no further description will be given here.

In the embodiment of the present application, in the case where the frequency domain unit to be reported in the frequency domain unit group satisfies the preset condition, the PMI includes an indication of one or more frequency domain vectors. The one or more frequency domain vectors are partial frequency domain vectors in the frequency domain vector group. As mentioned above, each frequency domain vector in each frequency domain vector group is orthogonal to each other. That is to say, the one or more frequency domain vectors may be one or more frequency domain vectors selected from the frequency domain vector group by frequency domain compression.

In the case where the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, the PMI does not include the indication of the frequency domain vector, or only includes the indication of the frequency domain vector group.

Specifically, when the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, the terminal device may still use the PMI feedback method of the type II codebook to report the space domain vector, broadband amplitude coefficient, and subband superposition coefficient, in this case Next, the indication of the frequency domain vector is not included in the PMI.

When the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, the terminal device may directly feed back a frequency domain vector group to the network device without using the type II codebook feedback method, so that the network device can Each frequency domain vector in the frequency domain vector group, as well as the space domain vector and weighting coefficients, restore the precoding vector. In this case, the PMI may include only the indication of the frequency domain vector group. Alternatively, the terminal device may not feed back the indication of the frequency domain vector group, and the terminal device and the network device may agree in advance to use the frequency domain vector of the first frequency domain vector group in the frequency domain vector set for recovering the precoding vector. In this case, the PMI does not include the indication of the frequency domain vector or frequency domain vector group. At this time, although dual-domain compression is performed, part of the frequency-domain vectors is not selected from the frequency-domain vector group, but all frequency-domain vectors in the frequency-domain vector group are used to construct a precoding vector. The terminal device may directly determine the space domain vector and the weighting coefficient based on all frequency domain vectors in the frequency domain vector group, and further based on the dual domain compression. For example, the spatial domain frequency and DFT of the spatial frequency matrix are used to determine the spatial domain vector and the weighting coefficient.

In order to facilitate differentiation and description, in this embodiment, the dual-domain compression method of constructing the precoding vectors using part of the frequency domain vectors in the frequency domain vector group is called the first compression method; the entire frequency domain vector group will be used to construct the pre-coding vector The dual-domain compression method of the encoding vector is called the second compression method. The method of feeding back the PMI based on the first compression method is referred to as the PMI feedback method based on the first compression method, and the method of feeding back the PMI based on the second compression method is referred to as the PMI feedback method based on the second compression method. It can be understood that both the first compression method and the second compression method belong to the dual-domain compression method.

It should be noted that the PMI described above includes the indication of the frequency domain vector, but does not mean that the PMI includes only the indication of the frequency domain vector. For example, the PMI may also include the indication of the space domain vector and the indication of the weighting coefficient. The indication of whether the frequency domain vector is included in the PMI described here is just to distinguish the first compression method from the second compression method.

In the embodiment of the present application, the terminal device and the network device may pre-appoint preset conditions. When the frequency domain unit to be reported in the frequency domain unit group satisfies the preset condition, the PMI feedback based on the first compression method is adopted; when the frequency domain unit in the frequency domain unit group does not satisfy the preset condition, it is adopted The PMI feedback method based on the second compression method, or the PMI feedback method using type II codebook.

Where the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, whether the PMI feedback mode based on the second compression mode or the PMI feedback mode of the type II codebook can be pre-determined by the network device and the terminal device The agreement, or, the agreement is predefined. When it is determined that the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, the network device and the terminal device may perform corresponding steps based on the same feedback method.

The following exemplarily lists several possible preset conditions. It should be understood that when the protocol defines, or when the network device and the terminal device agree in advance to use a certain preset condition as the basis for determining the PMI feedback method, the network device and the terminal device determine the PMI feedback method based on the same preset condition. It should also be understood that the preset conditions listed below are only examples, and should not constitute any limitation to this application.

Optionally, the preset condition is: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, x is a predefined value, and 0<x≤1. In other words, the ratio of the number of frequency domain units to be reported in the frequency domain unit group to Q is greater than or equal to x. Optionally, x=0.5.

Optionally, the preset condition is: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined first threshold.

Optionally, the preset condition is that: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined second threshold, and the Q value is greater than or equal to a predefined third threshold.

Optionally, the preset condition is: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined fourth threshold, and the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to y ×Q, 0<y≤1, y is a predefined value.

Optionally, the preset condition is that the number of frequency domain units in the frequency domain unit group that does not need to be reported is less than or equal to a predefined fifth threshold, and the Q value is greater than or equal to a predefined sixth threshold.

Optionally, the preset condition is: the number of frequency domain units that do not need to be reported in the frequency domain unit group is less than or equal to a predefined seventh threshold, and the number of frequency domain units that do not need to be reported are less than or equal to z×Q, 0 <z≤1, z is a predefined value.

Optionally, the preset condition is: the number of frequency domain units in the frequency domain unit group that does not need to be reported is less than or equal to a predefined eighth threshold.

Since the above-mentioned preset conditions have been described in detail in the above method 200, for the sake of brevity, they will not be repeated here.

When the terminal device determines the frequency domain vector based on the first compression method, the length N _{f of} the frequency domain vector can be, for example, from the frequency domain unit group listed above from the first frequency domain unit to be reported to the last frequency to be reported The number Q of frequency domain units contained in the bandwidth occupied by the domain unit is determined. Since the relationship between N _f and Q has been described in detail in the above method 200, for the sake of brevity, no further description will be given here.

However, it should be understood that the length N _{f of the} frequency domain vector is not limited to be determined by the above Q value, for example, the length of the frequency domain vector can also be determined by the number of frequency domain units included in the reported bandwidth, or, by the frequency domain unit group The number of frequency domain units to be reported is determined. This application does not limit this.

When the terminal device determines the frequency domain vector group based on the second compression mode, the length N _{f of} the frequency domain vector may also be the same as the length of the frequency domain vector determined in the first compression mode. For example, the length of the frequency domain vector may be determined by the number Q of frequency domain units contained in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit in the frequency domain unit group. Alternatively, the length of the frequency domain vector may also be determined by the number of frequency domain units to be reported in the frequency domain unit group, or the length of the frequency domain vector may also be determined by the number of frequency domain units included in the reported bandwidth. This application does not limit this.

After the protocol determines the length of the frequency domain vector, the terminal device can determine the length of the frequency domain vector based on a predefined method. The network device may also determine the frequency domain vector used to recover the precoding vector based on the same method and the feedback of the terminal device.

In step 620, the terminal device sends PMI. Accordingly, the network device receives the PMI.

Specifically, the terminal device may send the PMI to the network device through physical uplink resources, such as PUSCH or PUCCH, so that the terminal device determines the precoding matrix according to the PMI.

The specific method for the terminal device to send the PMI to the network device through the physical uplink resource may be the same as that in the prior art. For brevity, a detailed description of the specific process is omitted here.

In step 630, the network device determines the precoding matrix corresponding to each frequency domain unit according to the PMI and whether the frequency domain unit to be reported in the frequency domain unit group meets the preset condition.

The network device may determine which feedback method the terminal device uses to feed back the PMI based on the preset conditions described above, and then parse the information in the PMI according to the feedback method.

If the network device determines that the frequency domain unit to be reported in the frequency domain unit group meets the preset condition, it may be determined that the terminal device determines the frequency domain vector based on the first compression mode, that is, the PMI feedback mode based on frequency domain compression is used. The network device may restore the precoding vectors of one or more frequency domain units on each transmission layer based on the method listed in step 250 in the above method 200, and then determine the precoding matrix of each frequency domain unit.

If the network device determines that the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, it may be determined that the terminal device adopts a type II codebook PMI feedback method, or a frequency domain transform-based PMI feedback method.

If the PMI feedback method of type II codebook is used, the network device can determine the precoding matrix of each frequency domain unit based on the existing technology. For specific implementation, refer to the feedback mode defined in the type II port selection codebook defined in the NR protocol TS38.214 version 15 (release 15, R15). For brevity, I will not repeat them here.

If the PMI feedback method based on the second compression method is used, the network device may determine the precoding matrix of each frequency domain unit based on the two-domain compression method according to the predefined frequency domain vector group or the frequency domain vector group fed back by the terminal device. The specific implementation manner has been described in detail in step 250 of the above method 200, and for the sake of brevity, no more details will be given here.

Therefore, embodiments of the present application introduce multiple feedback modes, and select an appropriate feedback mode to report PMI according to the number and position of frequency domain units to be reported. Fully considered the number of frequency domain units to be reported and the continuity of distribution. By introducing multiple feedback modes to adapt to different situations, you can take into account both feedback accuracy and feedback overhead, so as to achieve a balance between the two.

It should be understood that in the above embodiments, the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application .

In the above, the instructions provided by the embodiments of the present application and the method for determining the precoding vector are described in detail with reference to FIGS. 2 to 6. Hereinafter, the communication device provided by the embodiment of the present application will be described in detail with reference to FIGS. 7 to 9.

7 is a schematic block diagram of a communication device provided by an embodiment of the present application. As shown, the communication device 1000 may include a communication unit 1100 and a processing unit 1200.

In a possible design, the communication device 1000 may correspond to the terminal device in the foregoing method embodiment, for example, it may be a terminal device, or a chip configured in the terminal device.

Specifically, the communication device 1000 may correspond to the terminal device in the method 200 or the method 600 according to an embodiment of the present application, and the communication device 1000 may include a terminal for performing the method 200 in FIG. 2 or the method 600 in FIG. 6 A unit of method performed by a device. In addition, each unit in the communication device 1000 and the other operations and/or functions described above are to implement the corresponding processes of the method 200 in FIG. 2 or the method 600 in FIG. 6, respectively.

Wherein, when the communication device 1000 is used to perform the method 200 in FIG. 2, the communication unit 1100 can be used to perform steps 220 and 230 in the method 200, and the processing unit 1200 can be used to perform step 210 in the method 200. It should be understood that the specific process for each unit to execute the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, no further description is provided here.

When the communication device 1000 is used to perform the method 600 in FIG. 6, the communication unit 1100 may be used to perform step 620 in the method 600 and the processing unit 1200 may be used to perform step 610 in the method 600. It should be understood that the specific process for each unit to execute the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, no further description is provided here.

It should also be understood that when the communication device 1000 is a terminal device, the communication unit 1100 in the communication device 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in FIG. 8, and the processing unit 1200 in the communication device 1000 may It corresponds to the processor 2010 in the terminal device 2000 shown in FIG. 8.

It should also be understood that when the communication device 1000 is a chip configured in a terminal device, the communication unit 1100 in the communication device 1000 may be an input/output interface.

In another possible design, the communication device 1000 may correspond to the network device in the foregoing method embodiment, for example, it may be a network device, or a chip configured in the network device.

Specifically, the communication device 1000 may correspond to the network device in the method 200 or the method 600 according to an embodiment of the present application. The communication device 1000 may include the method 200 in FIG. 2 or the method 600 in FIG. 6. A unit of a method performed by a network device. In addition, each unit in the communication device 1000 and the other operations and/or functions described above are to implement the corresponding processes of the method 200 in FIG. 2 or the method 600 in FIG. 6, respectively.

Wherein, when the communication device 1000 is used to perform the method 300 in FIG. 7, the communication unit 1100 can be used to perform steps 220 and 230 in the method 200, and the processing unit 1200 can be used to perform steps 240 and 250 in the method 200. It should be understood that the specific process for each unit to execute the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, no further description is provided here.

When the communication device 1000 is used to perform the method 600 in FIG. 6, the communication unit 1100 may be used to perform step 620 in the method 600 and the processing unit 1200 may be used to perform step 630 in the method 600. It should be understood that the specific process for each unit to execute the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, no further description is provided here.

It should also be understood that when the communication device 1000 is a network device, the communication unit in the communication device 1000 may correspond to the transceiver 3200 in the network device 3000 shown in FIG. 9, and the processing unit 1200 in the communication device 1000 may It corresponds to the processor 3100 in the network device 3000 shown in FIG. 9.

It should also be understood that when the communication device 1000 is a chip configured in a network device, the communication unit 1100 in the communication device 1000 may be an input/output interface.

FIG. 8 is a schematic structural diagram of a terminal device 2000 provided by an embodiment of the present application. The terminal device 2000 can be applied to the system shown in FIG. 1 to perform the functions of the terminal device in the above method embodiments. As shown, the terminal device 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further includes a memory 2030. Among them, the processor 2010, the transceiver 2002 and the memory 2030 can communicate with each other through an internal connection channel to transfer control and/or data signals. The memory 2030 is used to store a computer program, and the processor 2010 is used from the memory 2030 Call and run the computer program to control the transceiver 2020 to send and receive signals. Optionally, the terminal device 2000 may further include an antenna 2040 for sending uplink data or uplink control signaling output by the transceiver 2020 through a wireless signal.

The processor 2010 and the memory 2030 may be combined into a processing device. The processor 2010 is used to execute the program code stored in the memory 2030 to implement the above functions. In specific implementation, the memory 2030 may also be integrated in the processor 2010 or independent of the processor 2010. The processor 2010 may correspond to the processing unit in FIG. 7.

The above-mentioned transceiver 2020 may correspond to the communication unit in FIG. 7, and may also be referred to as a transceiver unit. The transceiver 2020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Among them, the receiver is used to receive signals, and the transmitter is used to transmit signals.

It should be understood that the terminal device 2000 shown in FIG. 8 can implement various processes involving the terminal device in the method embodiment shown in FIG. 2 or FIG. 6. The operations and/or functions of each module in the terminal device 2000 are respectively to implement the corresponding processes in the above method embodiments. For details, please refer to the description in the above method embodiments. In order to avoid repetition, the detailed description is appropriately omitted here.

The above-mentioned processor 2010 may be used to perform the actions described in the foregoing method embodiments that are internally implemented by the terminal device, and the transceiver 2020 may be used to perform the operations described in the foregoing method embodiments by the terminal device to or from the network device. action. For details, please refer to the description in the foregoing method embodiment, and no more details are provided here.

Optionally, the terminal device 2000 may further include a power supply 2050, which is used to provide power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal device more perfect, the terminal device 2000 may further include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, a sensor 2100, etc. The audio circuit It may also include a speaker 2082, a microphone 2084, and so on.

9 is a schematic structural diagram of a network device provided by an embodiment of the present application, for example, may be a schematic structural diagram of a base station. The base station 3000 can be applied to the system shown in FIG. 1 to perform the functions of the network device in the above method embodiments. As shown in the figure, the base station 3000 may include one or more radio frequency units, such as a remote radio unit (RRU) 3100 and one or more baseband units (BBU) (also called a distributed unit (DU) )) 3200. The RRU 3100 may be called a transceiver unit, corresponding to the communication unit 1200 in FIG. 7. Optionally, the transceiver unit 3100 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 3101 and a radio frequency unit 3102. Optionally, the transceiving unit 3100 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter, transmitting circuit). The RRU 3100 part is mainly used for the transmission and reception of radio frequency signals and the conversion of radio frequency signals and baseband signals, for example, for sending instruction information to terminal devices. The 3200 part of the BBU is mainly used for baseband processing and controlling the base station. The RRU 3100 and the BBU 3200 may be physically arranged together, or may be physically separated, that is, distributed base stations.

The BBU 3200 is the control center of the base station, and may also be referred to as a processing unit, which may correspond to the processing unit 1100 in FIG. 7 and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, and so on. For example, the BBU (processing unit) may be used to control the base station to perform the operation flow on the network device in the above method embodiment, for example, to generate the above indication information.

In an example, the BBU 3200 may be composed of one or more boards, and multiple boards may jointly support a wireless access network (such as an LTE network) of a single access standard, or may support different access standards respectively. Wireless access network (such as LTE network, 5G network or other networks). The BBU 3200 also includes a memory 3201 and a processor 3202. The memory 3201 is used to store necessary instructions and data. The processor 3202 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation flow of the network device in the foregoing method embodiment. The memory 3201 and the processor 3202 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It is also possible that multiple boards share the same memory and processor. In addition, each board can also be provided with necessary circuits.

It should be understood that the base station 3000 shown in FIG. 9 can implement various processes involving the network device in the method embodiment of FIG. 2 or FIG. 6. The operations and/or functions of each module in the base station 3000 are to implement the corresponding processes in the above method embodiments. For details, please refer to the description in the above method embodiments. In order to avoid repetition, the detailed description is appropriately omitted here.

The above-mentioned BBU 3200 can be used to perform the actions described in the foregoing method embodiments that are implemented internally by the network device, and the RRU 3100 can be used to perform the actions described in the previous method embodiments that the network device sends to or receives from the terminal device. For details, please refer to the description in the foregoing method embodiment, and no more details are provided here.

An embodiment of the present application further provides a processing device, including a processor and an interface; the processor is used to execute the vector indication method for constructing a precoding vector in any of the foregoing method embodiments.

It should be understood that the above processing device may be one or more chips. For example, the processing device may be a field programmable gate array (field programmable gate array (FPGA)), an application specific integrated circuit (ASIC), or a system chip (SoC), or It is a central processor (CPU), it can also be a network processor (NP), it can also be a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (micro controller) , MCU), can also be a programmable controller (programmable logic device, PLD) or other integrated chips.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor. The software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. In order to avoid repetition, they are not described in detail here.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method embodiments may be completed by instructions in the form of hardware integrated logic circuits or software in the processor. The aforementioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components . The methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electronically Erasable programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (random access memory, RAM), which acts as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous RAM, SDRAM), double data rate synchronous dynamic random access memory (double data SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) ) And direct memory bus random access memory (direct RAMbus RAM, DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to these and any other suitable types of memories.

According to the method provided in the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on the computer, the computer is caused to perform the operations shown in FIGS. 2 and 6 The method of any one of the embodiments is shown.

According to the method provided in the embodiments of the present application, the present application also provides a computer-readable medium, the computer-readable medium stores program code, and when the program code is run on the computer, the computer is caused to execute the operations shown in FIGS. 2 and 6. The method of any one of the embodiments is shown.

According to the method provided in the embodiments of the present application, the present application further provides a system, which includes the foregoing one or more terminal devices and one or more network devices.

In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available medium integrated servers, data centers, and the like. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (DVD)), or a semiconductor medium (for example, a solid state disc, SSD)) etc.

The network device in each of the above device embodiments corresponds exactly to the network device or terminal device in the terminal device and method embodiments, and the corresponding steps are performed by the corresponding modules or units, for example, the communication unit (transceiver) performs the receiving or The steps of sending, other than sending and receiving, can be executed by the processing unit (processor). The function of the specific unit can refer to the corresponding method embodiment. There may be one or more processors.

The terms "component", "module", "system", etc. used in this specification are used to denote computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and/or a computer. By way of illustration, both the application running on the computing device and the computing device can be components. One or more components can reside in a process and/or thread of execution, and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The component may, for example, be based on a signal having one or more data packets (eg, data from two components that interact with another component between a local system, a distributed system, and/or a network, such as the Internet that interacts with other systems through signals) Communicate through local and/or remote processes.

Those of ordinary skill in the art may realize that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware achieve. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and conciseness of the description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this 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 alone physically, or two or more units may be integrated into one unit.

In the above embodiments, the functions of each functional unit may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on the computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available medium integrated servers, data centers, and the like. The usable medium may be a magnetic medium (eg, floppy disk, hard disk, magnetic tape), optical medium (eg, DVD), or semiconductor medium (eg, solid state disk (SSD)), or the like.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A vector indicating method for constructing a precoding vector is characterized by including:

Generate first indication information, where the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit correspondences in a frequency domain unit group The precoding vector of the frequency domain, the length N f of the frequency domain vector is from the frequency domain unit in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group The quantity Q is determined, wherein the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reported bandwidth; N f and Q are both positive integers;

Sending the first indication information.
The method of claim 1, wherein the generating the first indication information comprises:

When the frequency domain unit to be reported in the frequency domain unit group meets a preset condition, the first indication information is generated.
The method according to claim 2, wherein the preset condition comprises: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, x is a predefined value, 0< x≤1.
The method of claim 3, wherein x is 0.5.
The method according to any one of claims 1 to 4, wherein Nf = Q.
A vector indicating method for constructing a precoding vector is characterized by including:

Receiving first indication information, where the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit correspondences in a frequency domain unit group The precoding vector of the frequency domain, the length of the frequency domain vector from N f from the frequency domain unit in the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit to be reported The quantity Q is determined, wherein the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth of the reported bandwidth; N f and Q are both positive integers ;

The one or more frequency domain vectors are determined according to the first indication information.
The method according to claim 6, wherein the determining the one or more frequency domain vectors according to the first indication information comprises:

When the frequency domain unit to be reported in the frequency domain unit group satisfies a preset condition, the one or more frequency domain vectors are determined according to the first indication information.
The method according to claim 7, wherein the preset condition comprises: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, x is a predefined value, 0< x≤1.
The method of claim 8, wherein x is 0.5.
The method according to any one of claims 6 to 9, wherein Nf = Q.
A communication device, characterized in that it includes:

The processing unit is configured to generate first indication information, and the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit groups The precoding vector corresponding to each frequency domain unit, the length N f of the frequency domain vector is included in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group The number of frequency domain units Q is determined, where the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reported bandwidth; N f and Q Are positive integers;

The communication unit is configured to send the first indication information.
The apparatus according to claim 11, wherein the processing unit is specifically configured to generate the first indication information when a frequency domain unit to be reported in the frequency domain unit group meets a preset condition .
The device according to claim 12, wherein the preset condition comprises: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, x is a predefined value, 0< x≤1.
The device of claim 13, wherein x is 0.5.
The device according to any one of claims 11 to 14, wherein N f =Q.
A communication device, characterized in that it includes:

The communication unit is configured to receive first indication information, and the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit groups The precoding vector corresponding to each frequency domain unit, the length of the frequency domain vector ranges from N f from the frequency domain unit in the bandwidth occupied by the first frequency domain unit to be reported to the last frequency domain unit to be reported The number Q of included frequency domain units is determined, wherein the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reported bandwidth; N f and Q is a positive integer;

The processing unit is configured to determine the one or more frequency domain vectors according to the first indication information.
The apparatus according to claim 16, wherein the processing unit is specifically configured to, according to the first indication information, when a frequency domain unit to be reported in the frequency domain unit group meets a preset condition The one or more frequency domain vectors are determined.
The apparatus according to claim 17, wherein the preset condition comprises: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, x is a predefined value, 0< x≤1.
The device of claim 18, wherein x is 0.5.
The device according to any one of claims 16 to 19, characterized in that N f =Q.
A communication device, characterized in that it includes:

A processor, configured to generate first indication information, where the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit groups The precoding vector corresponding to each frequency domain unit, the length N f of the frequency domain vector is included in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group The number of frequency domain units Q is determined, where the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reported bandwidth; N f and Q Are positive integers;

The transceiver is used to send the first indication information.
The apparatus according to claim 21, wherein the processor is specifically configured to generate the first indication information when a frequency domain unit to be reported in the frequency domain unit group meets a preset condition .
The apparatus of claim 22, wherein the preset condition comprises: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, x is a predefined value, 0< x≤1.
The device of claim 23, wherein x is 0.5.
The device according to any one of claims 21 to 24, wherein N f =Q.
A communication device, characterized in that it includes:

The transceiver is used to receive first indication information, and the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit groups The precoding vector corresponding to each frequency domain unit, the length of the frequency domain vector ranges from N f from the frequency domain unit in the bandwidth occupied by the first frequency domain unit to be reported to the last frequency domain unit to be reported The number Q of included frequency domain units is determined, wherein the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reported bandwidth; N f and Q is a positive integer;

The processor is configured to determine the one or more frequency domain vectors according to the first indication information.
The apparatus according to claim 26, wherein the processor is specifically configured to, according to the first indication information, when a frequency domain unit to be reported in the frequency domain unit group meets a preset condition The one or more frequency domain vectors are determined.
The apparatus according to claim 27, wherein the preset condition includes: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x×Q, x is a predefined value, 0< x≤1.
The apparatus of claim 28, wherein x is 0.5.
The device according to any one of claims 26 to 29, wherein N f =Q.
A communication device, characterized in that the device is used to implement the method according to any one of claims 1 to 5.
A communication device, characterized in that the device is used to implement the method according to any one of claims 6 to 10.
A communication device, characterized in that it includes a processor for executing a computer program stored in a memory, so that the device implements the method according to any one of claims 1 to 5.
A communication device, characterized by comprising a processor for executing a computer program stored in a memory, so that the device implements the method according to any one of claims 6 to 10.
A processing device, characterized in that it includes:

Memory, used to store computer programs;

A processor, configured to call and run the computer program from the memory, so that the device implements the method according to any one of claims 1 to 5.
A processing device, characterized in that it includes:

Memory, used to store computer programs;

A processor for calling and running the computer program from the memory to cause the device to implement the method according to any one of claims 6 to 10.
A computer-readable storage medium, characterized by comprising a computer program, when the computer program runs on a computer, causing the computer to execute the method according to any one of claims 1 to 5.
A computer-readable storage medium, characterized by comprising a computer program, when the computer program runs on a computer, causing the computer to execute the method according to any one of claims 6 to 10.
A computer program product, the computer program product includes a computer program, and when the computer program runs on a computer, causes the computer to execute the method according to any one of claims 1 to 5.
A computer program product, the computer program product includes a computer program, and when the computer program runs on a computer, causes the computer to perform the method according to any one of claims 6 to 10.