CN111010218A

CN111010218A - Method for indicating and determining precoding vector and communication device

Info

Publication number: CN111010218A
Application number: CN201811169081.2A
Authority: CN
Inventors: 尹海帆; 王潇涵; 金黄平; 毕晓艳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-10-08
Filing date: 2018-10-08
Publication date: 2020-04-14
Anticipated expiration: 2038-10-08
Also published as: CN111010218B; WO2020073788A1

Abstract

The application provides a method and a communication device for indicating and determining a precoding vector, and reduces feedback overhead. The method comprises the following steps: the terminal device generates and transmits first indication information, wherein the first indication information is used for indicating the L beam vectors, one or more amplitude component vectors corresponding to each beam vector, the weighting coefficients of the amplitude component vectors, one or more phase component vectors and the weighting coefficients of the phase component vectors. One or more amplitude component vectors corresponding to the ith beam vector and weighting coefficients of each amplitude component vector are used for constructing the amplitude vector of the ith beam vector, and one or more phase component vectors corresponding to the ith beam vector and weighting coefficients of each phase component vectorThe number is used to construct the phase vector of the l-th beam vector, the amplitude vector and the phase vector of the l-th beam vector are used to determine the weighting coefficient vector of the l-th beam vector, the weighting coefficient vector comprises N_sbN corresponding to each sub-band_sbA weighting factor.

Description

Method for indicating and determining precoding vector and communication device

Technical Field

The present application relates to the field of wireless communications, and more particularly, to a method of indicating and determining a precoding vector and a communication apparatus.

Background

In a large-scale multiple-input multiple-output (massive mimo) technology, a network device can reduce interference among multiple users and interference among multiple signal streams of the same user through precoding, which is beneficial to improving signal quality, realizing space division multiplexing and improving spectrum utilization rate.

The terminal device may determine the precoding vector through channel measurement, and hopefully, the network device obtains the same or similar precoding vector as the precoding vector through feedback. In one implementation, the terminal device may indicate the precoding vector to the network device through a two-stage feedback manner of wideband feedback and subband feedback. Specifically, the terminal device may indicate, on a per transmission layer basis, the selected beam vector and the quantized value of the wideband amplitude coefficient of each beam vector through wideband feedback, and may indicate the quantized value of the combining coefficient usable for each subband through subband feedback, where the combining coefficient may include, for example, a subband amplitude coefficient and a subband phase coefficient. The network device can synthesize the information fed back by the broadband and the information fed back by the sub-band to restore the precoding matrix approximate to the ideal precoding matrix.

However, as the number of transmission layers increases, the feedback overhead caused by the feedback mode is multiplied. And the larger the number of sub-bands, the larger the magnitude of the increase in feedback overhead.

Disclosure of Invention

The application provides a method for indicating and determining a precoding vector and a communication device, aiming to reduce feedback overhead.

In a first aspect, a method for indicating a precoding vector is provided, which may be performed by a terminal device, or may be performed by a chip configured in the terminal device.

Specifically, the method comprises the following steps: generating first indication information; and sending the first indication information. The first indication information is used for indicating L beam vectors, one or more amplitude component vectors corresponding to each beam vector and weighting coefficients of the amplitude component vectors, one or more phase component vectors corresponding to each beam vector and weighting coefficients of the phase component vectors. One or more amplitude component vectors corresponding to the l-th beam vector and the weighting coefficients of the respective amplitude component vectors are used to construct the amplitude vector of the l-th beam vector, and one or more phase component vectors corresponding to the l-th beam vector and the weighting coefficients of the respective phase component vectors are used to construct the phase vector of the l-th beam vector. The magnitude vector of the l-th beam vector and the phase vector of the l-th beam vector are used to determine a weighting coefficient vector for the l-th beam vector. The weighting coefficient vector comprises N_sbAn element, an nth element in the weighting coefficient vector_sbElement is the ith beam vector at nth_sbWeighting coefficients on each subband. L beam vectors and the number of L beam vectors at the n-th position_sbThe weighting coefficients on the subbands are used to construct the sum of the coefficients and the nth_sbAnd precoding vectors corresponding to the sub-bands. Wherein the first beam vector is any one of L beam vectors, and n is more than or equal to 0_sb≤N_sb-1，0≤l≤L-1，n_sbAnd L is an integer, L and N_sbIs a positive integer.

Based on the technical scheme, the terminal device can feed back the weighting coefficient of each beam vector in each sub-band to the network device through the amplitude component vector and the weighting coefficient thereof, and the phase component vector and the weighting coefficient thereof. The weighted sum of the magnitude component vectors corresponding to each beam vector may be used to determine magnitude coefficients for a beam vector at a plurality of subbands and the weighted sum of the phase component vectors corresponding to each beam vector may be used to determine phase coefficients for a beam vector at a plurality of subbands. Therefore, the network equipment can determine the weighting coefficient of each beam vector on each sub-band according to the amplitude component vector and the weighting coefficient thereof, the phase component vector and the weighting coefficient thereof indicated by the terminal equipment, and further determine the precoding vector of each sub-band.

Since the amplitude coefficient and the phase coefficient of each beam vector in a plurality of sub-bands can be represented by the amplitude vector and the phase vector, respectively, the feedback overhead does not change due to the change of the number of sub-bands. In other words, this feedback mode can be understood as a mode of subband joint feedback. In this feedback mode, the terminal device does not need to perform separate feedback on the amplitude coefficient and the phase coefficient of each sub-band. And the amplitude vector and the phase vector of each beam vector are approximately represented by the weighted summation of one or more amplitude component vectors and the weighted summation of one or more phase component vectors, so that the feedback overhead of the amplitude coefficient and the phase coefficient can be compressed, and the feedback overhead is greatly reduced on the basis of ensuring the approximate accuracy. With reference to the first aspect, in certain implementations of the first aspect, the method further includes: and receiving second indication information, wherein the second indication information is used for indicating the number of the amplitude component vectors corresponding to each beam vector in the L beam vectors.

That is, the number of the magnitude component vectors may be indicated by the network device.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: and receiving second indication information, wherein the second indication information is used for indicating the number of the amplitude component vectors corresponding to each beam vector in the L beam vectors.

That is, the number of the amplitude component vectors may be determined and reported by the terminal device.

It should be understood that the number of amplitude component vectors may also be predefined, as defined by the protocol. This is not a limitation of the present application.

Optionally, the number of the amplitude component vectors corresponding to any two of the L beam vectors is the same, or the number of the amplitude component vectors corresponding to at least two of the L beam vectors is different.

When the number of amplitude component vectors of any two of the L beam vectors is the same, the second indication information may indicate the number of amplitude component vectors only once; when the number of amplitude component vectors of at least two of the L beam vectors is different, the second indication information may indicate the number of amplitude component vectors once for each beam vector, respectively.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: receiving third indication information, wherein the third indication information is used for indicating the number of the phase component vectors corresponding to each beam vector in the L beam vectors.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: and transmitting third indication information, wherein the third indication information is used for indicating the number of the phase component vectors corresponding to each beam vector in the L beam vectors.

It should be understood that the number of phase component vectors may also be predefined, as defined by the protocol. This is not a limitation of the present application.

Optionally, the number of the phase component vectors corresponding to any two of the L beam vectors is the same, or the number of the phase component vectors corresponding to at least two of the L beam vectors is different.

When the number of phase component vectors of any two of the L beam vectors is the same, the third indication information may indicate the number of phase component vectors only once; when the number of phase component vectors of at least two of the L beam vectors is different, the third indication information may indicate the number of phase component vectors for one time for each beam vector.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: receiving fourth indication information for indicating the length of the amplitude component vector or the length N of the phase component vector_sb。

It should be understood that the length of the magnitude component vector and the length of the phase component vector may be the same. Thus, when the length of any one is determined, the length of the other can also be determined.

In a second aspect, a method of determining a precoding vector 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 comprises the following steps: receiving first indication information, wherein the first indication information is used for indicating L beam vectors, one or more amplitude component vectors corresponding to each beam vector and weighting coefficients of the amplitude component vectors, one or more phase component vectors corresponding to each beam vector and weighting coefficients of the phase component vectors. One or more amplitude component vectors corresponding to the l-th beam vector and the weighting coefficients of the respective amplitude component vectors are used to construct the amplitude vector of the l-th beam vector, and one or more phase component vectors corresponding to the l-th beam vector and the weighting coefficients of the respective phase component vectors are used to construct the phase vector of the l-th beam vector. The magnitude vector of the l-th beam vector and the phase vector of the l-th beam vector are used to determine a weighting coefficient vector for the l-th beam vector. The weighting coefficient vector comprises N_sbAn element, an nth element in the weighting coefficient vector_sbElement is the ith beam vector at nth_sbWeighting coefficients on each subband. L beam vectors and the number of L beam vectors at the n-th position_sbThe weighting coefficients on the subbands are used to construct the sum of the coefficients and the nth_sbAnd precoding vectors corresponding to the sub-bands. Wherein the first beam vector is any one of L beam vectors, and n is more than or equal to 0_sb≤N_sb-1，0≤l≤L-1，n_sbAnd L is an integer, L and N_sbIs a positive integer. Determining N according to the first indication information_sbA precoding vector for at least one of the sub-bands.

Since the amplitude coefficient and the phase coefficient of each beam vector in a plurality of sub-bands can be represented by the amplitude vector and the phase vector, respectively, the feedback overhead does not change due to the change of the number of sub-bands. In other words, this feedback mode can be understood as a mode of subband joint feedback. In this feedback mode, the terminal device does not need to perform separate feedback on the amplitude coefficient and the phase coefficient of each sub-band. And the amplitude vector and the phase vector of each beam vector are approximately represented by the weighted summation of one or more amplitude component vectors and the weighted summation of one or more phase component vectors, so that the feedback overhead of the amplitude coefficient and the phase coefficient can be compressed, and the feedback overhead is greatly reduced on the basis of ensuring the approximate accuracy. With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and sending second indication information, wherein the second indication information is used for indicating the number of the amplitude component vectors corresponding to each beam vector in the L beam vectors.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and receiving second indication information, wherein the second indication information is used for indicating the number of the amplitude component vectors corresponding to each beam vector in the L beam vectors.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and transmitting third indication information, wherein the third indication information is used for indicating the number of the phase component vectors corresponding to each beam vector in the L beam vectors.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: receiving third indication information, wherein the third indication information is used for indicating the number of the phase component vectors corresponding to each beam vector in the L beam vectors.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: sending fourth indication information for indicating the length of the amplitude component vector or the length N of the phase component vector_sb。

It should be understood that the length of the magnitude component vector and the length of the phase component vector may be the same. Thus, if the length of any one is determined, the length of the other can also be determined.

With reference to the first aspect or the second aspect, in some possible implementations, the number of amplitude component vectors corresponding to any two beam vectors in the L beam vectors is the same, and the number of phase component vectors corresponding to any two beam vectors is the same.

The second indication information may indicate the number of primary amplitude component vectors only, and the third indication information may indicate the number of primary phase component vectors only.

With reference to the first aspect or the second aspect, in some possible implementations, a magnitude component vector corresponding to a first beam vector of the L beam vectors is the same as a magnitude component vector corresponding to a second beam vector, and the first beam vector and the second beam vector are any two beam vectors of the L beam vectors.

For example, the number of amplitude component vectors is denoted as K_a，K_aIs a positive integer. That is, the L beam vectors may share the same K_aA vector of amplitude components. The first indication information, when used to indicate one or more magnitude component vectors corresponding to each beam vector, may indicate the K for L beam vectors only once_aA vector of amplitude components. Further, whether or not the phase component vectors corresponding to the L beam vectors are the same is not limited.

With reference to the first aspect or the second aspect, in some possible implementations, a magnitude component vector corresponding to a first beam vector of the L beam vectors is the same as a magnitude component vector corresponding to a second beam vector, and a phase component vector corresponding to the first beam vector is the same as a phase component vector corresponding to the second beam vector, where the first beam vector and the second beam vector are any two beam vectors of the L beam vectors.

For example, the number of amplitude component vectors is denoted as K_a，K_aFor positive integers, the number of phase component vectors is denoted as K_p，K_pIs a positive integer. I.e. the LThe beam vectors may share the same K_aA vector of amplitude components, and may share the same K_pA phase component vector. The first indication information, when used to indicate one or more magnitude component vectors corresponding to each beam vector, may indicate the K for L beam vectors only once_aA vector of amplitude components; when used to indicate one or more phase component vectors corresponding to each beam vector, the K may be indicated only once for L beam vectors_pA phase component vector.

With reference to the first aspect or the second aspect, in some possible implementations, the length N of the amplitude component vector_sbComprises the following steps: measuring the number of sub-bands contained in a frequency domain allocation of a Channel State Information (CSI) measurement resource of a Channel State Information (CSI) configured for a terminal device; or the length of the signaling for indicating the position and the number of the sub-bands to be reported; or the number of sub-bands to be reported.

The frequency domain occupied bandwidth of the CSI measurement resource may also be referred to as a pilot transmission bandwidth or a measurement bandwidth. The frequency domain occupied bandwidth of the CSI measurement resource may be understood as a bandwidth for transmitting a reference signal, which is a reference signal for channel measurement, such as a CSI Reference Signal (RS). The signaling for indicating the Frequency domain occupied bandwidth of the CSI measurement resource may be, for example, a CSI-Frequency occupancy bandwidth range (CSI-Frequency occupancy).

The signaling for indicating the position and number of sub-bands to be reported may be, for example, reporting bandwidth (reporting band).

With reference to the first aspect or the second aspect, in some possible implementations, the one or more amplitude component vectors corresponding to each beam vector are taken from a set of amplitude component vectors, and the first indication information, when used to indicate the one or more amplitude component vectors, is specifically used to indicate an index of the one or more amplitude component vectors in the set of amplitude component vectors.

It should be understood that indicating the one or more amplitude component vectors by an index of a combination of amplitude component vectors is only one possible implementation and should not constitute any limitation to the present application. For example, the first indication information may also indicate selected amplitude component vectors in the set of amplitude component vectors, respectively.

With reference to the first aspect or the second aspect, in some possible implementations, the one or more amplitude component vectors corresponding to each beam vector are taken from a subset of a set of amplitude component vectors, the set of amplitude component vectors including a plurality of amplitude component vectors. The first indication information, when used for indicating the one or more amplitude component vectors, is specifically used for indicating the subset and an index of the one or more amplitude component vectors in the subset.

The set of amplitude component vectors may be expanded into a plurality of subsets by an oversampling factor. In this case, the first indication information may be used to indicate a subset to which the selected one or more amplitude component vectors belong and an index in the subset.

With reference to the first aspect or the second aspect, in some possible implementations, the one or more phase component vectors corresponding to each beam vector are taken from a set of phase component vectors, and the first indication information, when used to indicate the one or more phase component vectors, is specifically used to indicate an index of the one or more phase component vectors in the set of phase component vectors.

It should be understood that indicating the one or more phase component vectors by an index of a combination of phase component vectors is only one possible implementation and should not constitute any limitation to the present application. For example, the first indication information may also indicate the selected phase component vectors in the set of phase component vectors, respectively.

With reference to the first aspect or the second aspect, in some possible implementations, the one or more phase component vectors corresponding to each beam vector are taken from a subset of a set of phase component vectors, the set of phase component vectors including a plurality of phase component vectors. The first indication information, when used to indicate the one or more phase component vectors, is specifically used to indicate the subset and an index of the one or more phase component vectors in the subset.

The set of phase component vectors may also be extended into a plurality of subsets by an oversampling factor. In this case, the first indication information may be used to indicate a subset to which the selected one or more phase component vectors belong and an index in the subset.

With reference to the first aspect or the second aspect, in some possible implementations, the plurality of column vectors included in the set of phase component vectors are taken from a discrete fourier transform, DFT, matrix or an oversampled DFT matrix; alternatively, each column vector in the set of phase component vectors comprises a plurality of phase angles.

With reference to the first aspect or the second aspect, in some possible implementations, each phase component vector is determined by a set of phase angles, each set of phase angles is used for determining one phase component vector, each set of phase angles includes a plurality of phase angles, and the phase angles in each set of phase angles form an arithmetic series, and the arithmetic series formed by any two sets of phase angles have different tolerances.

Optionally, the first indication information, when used for indicating the one or more phase component vectors, may be used for indicating an index of a combination of the one or more phase component vectors, or an index of a subset to which the one or more phase component vectors belong and a combination in the subset.

Alternatively, the phase vector of each beam vector is represented by one phase component vector, i.e. the weighting coefficient of the phase component vector is 1. The first indication information, when used for indicating the phase component vector of each beam vector, is specifically used for indicating at least two of a first phase angle, a last phase angle and a tolerance of each group of one or more groups of phase angles.

Further, when the first indication information indicates the first phase angle and the last phase angle of each group of phase angles, the number of periods of the interval between the last phase angle and the first phase angle may be further indicated.

That is, the terminal device may indicate the phase vector of each beam vector by way of a linear fit. The network device may recover the phase vector of each beam vector by means of linear interpolation.

In a third aspect, a communication device is provided, which comprises various means or units for performing the method of any one of the possible implementations of the first aspect.

In a fourth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute the instructions in the memory to implement the method of any one of the possible implementations of the first aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being 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 equipment. When the communication device is a chip configured in a terminal device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In a fifth aspect, a communication device is provided, which comprises various modules or units for performing the method of any one of the possible implementations of the second aspect.

In a sixth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute the instructions in the memory to implement the method of any one of the possible implementations of the second aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being 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 the 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 seventh aspect, a processor is provided, including: input circuit, output circuit and processing circuit. The processing circuit is configured to receive an input signal via the input circuit and output a signal via the output circuit, so that the processor performs the method of the first aspect or the second aspect and any possible implementation manner of the first aspect or the second aspect.

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, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the signal output by the output circuit may be output to and transmitted by a transmitter, for example and without limitation, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times. The embodiment of the present application does not limit the specific implementation manner of the processor and various circuits.

In an eighth aspect, a processing apparatus is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory and to receive signals via the receiver and transmit signals via the transmitter to perform the method of the first or second aspect and any possible implementation of the first or second aspect.

Optionally, the number of the processors is one or more, and the number of the memories is one or more.

Alternatively, the memory may be integral to the processor or provided separately from the processor.

In a specific implementation process, the memory may be a non-transient memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips.

It will be appreciated that the associated data interaction process, for example, sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, the data output by the processor may be output to a transmitter and the input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

The processing device in the above eighth aspect may be a chip, the processor may be implemented by hardware or may be implemented by software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

In a ninth aspect, there is provided a computer program product, the computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes a computer to perform the method of any of the possible implementations of the first or second aspect and aspects described above.

A tenth aspect provides a computer-readable medium storing a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the computer to perform the method of any of the above-described first or second aspects and possible implementations of the first or second aspects.

In an eleventh aspect, a communication system is provided, which includes the foregoing network device and terminal device.

Drawings

Fig. 1 is a schematic diagram of a communication system suitable for indicating and determining a precoding vector according to an embodiment of the present application;

fig. 2 is a schematic flow chart of a method for indicating and determining a precoding vector provided by an embodiment of the present application;

fig. 3 is a schematic flowchart of a terminal device generating first indication information according to an embodiment of the present application;

fig. 4 is a schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth generation (5G) or New Radio (NR) system, and the like.

For the convenience of understanding the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described in detail by taking the communication system shown in fig. 1 as an example. Fig. 1 is a schematic diagram of a communication system 100 suitable for use in a method of indicating 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. Network device 110 and terminal device 120 may communicate via a wireless link. Each communication device, such as network device 110 or terminal device 120, may be configured with multiple antennas. For each communication device in the communication system 100, the configured plurality of antennas may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Accordingly, communication between communication devices in the communication system 100, such as between the network device 110 and the terminal device 120, may be via multiple antenna techniques.

It should be understood that the network device in the communication system may be any device having a wireless transceiving function. The network devices include, but are not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), Access Point (AP), wireless relay Node, wireless backhaul Node, Transmission Point (TP), or Transmission and Reception Point (TRP) in a wireless fidelity (WiFi) system, and the like, and may also be 5G, e.g., NR, a gbb in a system, or a transmission point (TRP or TP), one or a group of base stations in a 5G system may include multiple antennas, or may also constitute a panel of a network, e.g., a panel of a network, or a BBU, or a Distributed Unit (DU), etc.

In some deployments, the gNB may include a Centralized Unit (CU) and a DU. The gNB may also include a Radio Unit (RU). The CU implements part of the function of the gNB, and the DU implements part of the function of the gNB, for example, the CU implements the function of a Radio Resource Control (RRC) layer, a Packet Data Convergence Protocol (PDCP) layer, and the DU implements the function of a Radio Link Control (RLC), a Medium Access Control (MAC), and a Physical (PHY) layer. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as the RRC layer signaling, may also be considered to be transmitted by the DU or the DU + CU under this architecture. It is to 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), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

It should also be understood that terminal equipment in the wireless communication system may also be referred to as User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in telemedicine (remote), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios.

It should also be understood that fig. 1 is a simplified schematic diagram that is merely illustrated for ease of understanding, and that other network devices or other terminal devices, which are not shown in fig. 1, may also be included in the communication system 100.

In order to facilitate understanding of the embodiments of the present application, the following is a brief description of the processing procedure of the downlink signal at the physical layer before transmission. It should be understood that the processing of the downstream signal described below may be performed by the network device, or may be performed by a chip configured in the network device. For convenience of description, hereinafter, collectively referred to as network devices.

The network device may process a codeword (code word) on a physical channel. Where the codeword may be coded bits that are encoded (e.g., including channel coding). The codeword is scrambled (scrambling) to generate scrambled bits. The scrambled bits are modulation mapped (modulation mapping) to obtain modulation symbols. The modulation symbols are mapped to a plurality of layers (layers), or transport layers, through layer mapping (layermapping). The modulated symbols after layer mapping are precoded (precoding) to obtain precoded signals. The precoded signal is mapped to a plurality of Resource Elements (REs) after mapping the precoded signal to the REs. These REs are then modulated by Orthogonal Frequency Division Multiplexing (OFDM) and transmitted through an antenna port (antenna port).

In order to facilitate understanding of the embodiments of the present application, the following description is briefly made of terms related to the embodiments of the present application.

1. The precoding technology comprises the following steps: the network device can process the signal to be transmitted by means of the precoding matrix matched with the channel resource under the condition of the known channel state, so that the signal to be transmitted after precoding is matched with the channel, and the complexity of eliminating the influence between the channels by the receiving device is reduced. Therefore, by precoding the signal to be transmitted, the received signal quality (e.g., signal to interference plus noise ratio (SINR)) is improved. Therefore, by using the precoding technology, the transmission of the transmitting device and the multiple receiving devices on the same time-frequency resource can be realized, that is, multi-user multiple input multiple output (MU-MIMO) is realized. It should be noted that the related description regarding the precoding technique is merely exemplary for ease of understanding and is not intended to limit the scope of the embodiments of the present application. In a specific implementation process, the sending device may also perform precoding in other manners. For example, when the channel matrix cannot be known, precoding is performed using a preset precoding matrix or a weighting method. For brevity, the detailed contents thereof are not described herein again.

2. Precoding Matrix Indicator (PMI): may be used to indicate the precoding matrix. The precoding matrix may be a precoding matrix determined by the terminal device based on the channel matrix of each subband. The channel matrix may be determined by the terminal device through channel estimation or the like or based on channel reciprocity. In the embodiment of the present application, for convenience of differentiation and description, the precoding matrix determined by the terminal device is made to be an ideal precoding matrix. A vector in the ideal precoding matrix may be referred to as an ideal precoding vector.

For example, in order to obtain a precoding matrix that can be adapted to a channel, the network device may perform channel measurement in advance by transmitting a reference signal to the terminal device, and determine an ideal precoding vector for each subband based on the channel matrix for each subband.

Assuming that the channel matrix of a certain sub-band is H, the terminal device may apply the channel matrix H or the covariance matrix HH of the channel matrix^HSingular Value Decomposition (SVD) is performed to determine the ideal precoding matrix for that subband. Alternatively, the terminal device may also have a covariance matrix HH for the channel matrix^HAn Eigendecomposition (EVD) is performed to determine the ideal precoding matrix for that subband.

It should be understood that, due to different ways of determining the ideal precoding matrix, the PMI fed back by the terminal device may be different, and the precoding matrix determined by the network device based on the PMI may be different.

Taking SVD for the channel matrix H as an example, the terminal device may determine the channel matrix on each Resource Block (RB) in a certain subband according to a reference signal received on each RB, such as a channel state information reference signal (CSI-RS), and then average the channel matrix on each RB to obtain the channel matrix of the subband. After that, the terminal device may determine the ideal precoding matrix of each sub-band by performing SVD on the channel matrix of each sub-band or the covariance matrix of the channel matrix or performing EVD on the covariance matrix of the channel matrix of each sub-band.

After the terminal device performs SVD on the channel matrix H, it can obtain:

H＝U·S·V^H。

wherein, U is,V^HIs a unitary matrix, S is a diagonal matrix, and its non-zero elements (i.e. elements on the diagonal) are singular values of the channel matrix H, which can be generally arranged in descending order. Right unitary matrix V^HThe conjugate transpose of V is the ideal precoding matrix. In other words, the ideal precoding matrix is the precoding matrix calculated from the channel matrix H.

After that, the terminal device may quantize each element of the ideal precoding matrix of each subband, and feed back the quantized value to the sending device through the PMI, so that the network device determines the precoding matrix approximate to the ideal precoding matrix of each subband according to the PMI. For example, the network device may directly determine the precoding matrix of each subband according to the PMI, or may determine the precoding matrix of each subband according to the PMI and then perform further processing, such as orthogonalizing the precoding matrices (or precoding vectors) of different users, to determine the precoding matrix of each subband to be finally used. Therefore, the network equipment can determine the precoding matrix adaptive to the channel of each sub-band to perform precoding processing on the signal to be transmitted. It should be understood that, the specific method for the network device to determine the precoding matrix of each subband according to the PMI may refer to the prior art, which is only exemplified herein for ease of understanding and should not constitute any limitation to the present application.

The following shows a simple example of a precoding matrix through two-stage feedback when the rank (rank) is 1.

Wherein, W represents a precoding matrix to be fed back in one transmission layer, one subband and two polarization directions. W₁Can be fed back through a wide band, W₂Feedback may be via subbands. v. of₀To v₃Is W₁The plurality of beam vectors may be indicated, for example, by an index of a combination of the plurality of beam vectors. In the precoding matrix shown above, the beam vectors in both polarization directions are the same, and both beam vectors v are used₀To v₃。a₀To a₇Is W₁The wideband amplitude coefficient included in (b) may be indicated by a quantized value of the wideband amplitude coefficient. c. C₀To c₇Is W₂Each subband coefficient may include a subband magnitude coefficient and a subband phase coefficient. E.g. c₀To c₇May include sub-band amplitude coefficients α, respectively₀To α₇And subband phase coefficients

To

And may pass through sub-band amplitude coefficients α, respectively₀To α₇Quantized value and subband phase coefficient of

To

Is indicated by the quantization value of (a).

It should be understood that the precoding matrix shown above is derived based on feedback of one transmission layer and may therefore also be referred to as a precoding vector. When the number of transmission layers increases, the terminal device may feed back separately on a per transmission layer basis. The precoding vector fed back by each transmission layer can construct a precoding matrix of one sub-band. For example, the number of transmission layers is 4, and the precoding matrix may include 4 precoding vectors, which respectively correspond to the 4 transmission layers.

As the number of transmission layers increases, the feedback overhead of the terminal device also increases. E.g. 4 transport layer numbers, a₀To a₇And c₀To c₇Will be up to 4 times as high as one transport layer. That is, if the terminal device performs the wideband feedback and the subband feedback as described above on a per transmission layer basis, the feedback overhead increases by a factor as the number of transmission layers increases. And the larger the number of sub-bands, the larger the magnitude of the increase in feedback overhead. It is therefore desirable to provide a methodThe feedback overhead of the PMI can be reduced.

It should be understood that the above-listed manner of feeding back the ideal precoding matrix through the PMI is only an example, and should not constitute any limitation to the present application. For example, the terminal device may also feed back a channel matrix to the network device through the PMI, and the network device may determine the channel matrix according to the PMI, and further determine the precoding matrix, which is not limited in this application.

3. Precoding vector: in the embodiment of the present application, the precoding vector may refer to a vector in the precoding matrix, such as a column vector. The precoding matrix may be determined by precoding vectors for one or more transmission layers, and each vector in the precoding matrix may correspond to one transmission layer. Assume that the dimension of the precoding vector may be N₁X 1. if the number of transmission layers is R (R is a positive integer), the dimension of the precoding matrix may be N₁And x R. Wherein the number of transmission layers may be determined by a Rank Indicator (RI), N₁May represent the number of antenna ports, N₁Is a positive integer.

When the transmit antennas are configured with multiple polarization directions, the precoding vector may also refer to a component of the precoding matrix in one transmission layer, one polarization direction. Assuming that the number of polarization directions is P (P is a positive integer), the number of antenna ports in one polarization direction is N₂The dimension of the precoding vector corresponding to one transmission layer is (P × N)₂) X1, then the dimension of the precoding vector in one polarization direction may be N₂×1，N₂Is a positive integer.

In this embodiment, the precoding vector may correspond to one transmission layer, or may correspond to one polarization direction on one transmission layer.

4. Antenna port: may be referred to simply as a port. It is understood as a transmitting antenna recognized by the receiving device, or a transmitting antenna that is spatially distinguishable. One antenna port may be configured for each virtual antenna, each virtual antenna may be a weighted combination of multiple physical antennas, and each antenna port may correspond to one reference signal, and therefore, each antenna port may be referred to as a port of one reference signal, for example, a CSI-RS port, a Sounding Reference Signal (SRS) port, and the like.

5. Beam and beam vector: a beam may be understood as a distribution of signal strengths formed in a certain direction in space. The technique of forming the beam may be a beamforming (or, alternatively, beamforming) technique or other technique. The beamforming techniques may specifically be digital beamforming techniques, analog beamforming techniques and hybrid digital/analog beamforming techniques. In embodiments of the present application, the beams may be formed by digital beamforming techniques.

The beam vector may be a precoding vector in a precoding matrix, or may be a beamforming vector. Each element in the beam vector may represent a weight for each antenna port. The weighted signals of the antenna ports are superposed with each other to form an area with stronger signal strength. In other words, a beam can be obtained by linearly superimposing a plurality of beam vectors by a beamforming technique.

6. Amplitude vector: the vector is used for representing the variation rule of the amplitude of the weighting coefficient of each beam vector on each sub-band. And each beam vector and the weighting coefficient thereof on each sub-band can be respectively used for constructing the precoding vector of each sub-band.

Optionally, the length (or dimension) of the magnitude vector is the number of subbands included in the pilot transmission bandwidth allocated to the terminal device.

The frequency domain occupied bandwidth of the CSI measurement resource is also referred to as a pilot transmission bandwidth or a measurement bandwidth. The frequency domain occupied bandwidth of the CSI measurement resource may be a bandwidth for transmitting a reference signal, which may be a reference signal used for channel measurement, such as CSI-RS. In NR, the Frequency domain occupied bandwidth for indicating the CSI measurement resource may be, for example, a CSI-Frequency occupancy bandwidth range (CSI-Frequency occupancy).

It should be understood that the frequency domain occupied bandwidth, pilot transmission bandwidth, or measurement bandwidth of the CSI measurement resource are named only for convenience of description, and should not constitute any limitation to the present application, which does not exclude the possibility of expressing the same meaning by other names.

Optionally, the length of the amplitude vector is a length of a signaling for indicating a position and a number of subbands to be reported.

The signaling for indicating the position and number of the sub-bands to be reported may be reporting bandwidth (reporting band). The signaling can indicate the position and the number of the sub-bands to be reported in a bitmap form. Thus, the dimension of the magnitude vector may be the number of bits of the bitmap. It should be understood that the reporting band is only one possible nomenclature for the signaling and should not be construed as limiting the application in any way. This application does not exclude the possibility of naming the signaling by other names to achieve the same or similar functionality.

Optionally, the length of the magnitude vector is the number of subbands to be reported.

The number of sub-bands to be reported may be indicated by the signaling of the reporting bandwidth, for example. The number of the sub-bands to be reported can be all the sub-bands in the frequency domain occupied bandwidth of the CSI measurement resource, or can also be part of the sub-bands in the frequency domain occupied bandwidth of the CSI measurement resource; or, the number of sub-bands to be reported may be the same as the signaling length of the reporting bandwidth, or may be smaller than the signaling length of the reporting bandwidth. This is not a limitation of the present application.

Assume that the magnitude vector has a length of N_sb. The magnitude vector may be of dimension N_sbThe x1 column vector may have a dimension of 1 × N_sbThe row vector of (2). This is not limited in this application.

7. Phase vector: the vector is used for representing the change rule of the phase of the weighting coefficient of each beam vector on each sub-band.

In the embodiment of the present application, the length of the phase vector and the length of the magnitude vector may be the same. Optionally, the length of the phase vector is the number of subbands included in the frequency-domain occupied bandwidth of the CSI measurement resource configured to the terminal device. Optionally, the length of the phase vector is a length of a signaling for indicating a position and a number of subbands to be reported. Optionally, the length of the phase vector is the number of subbands to be reported.

Since the length of the phase vector and the length of the amplitude vector may be the same, the length of the phase vector may also be N_sb. The phase vector may be of dimension N_sbThe x1 column vector may have a dimension of 1 × N_sbThe row vector of (2). This is not limited in this application.

As described above, in the downlink channel measurement, the higher the approximation degree of the precoding matrix determined by the network device according to the PMI and the ideal precoding matrix determined by the terminal device is, the more the determined precoding matrix for data transmission can be adapted to the channel state, and therefore, the signal reception quality can be improved. In other words, the terminal device wants to be able to indicate to the network device the precoding matrix that most closely approximates the ideal precoding matrix.

In order to improve the utilization rate of spectrum resources and improve the data transmission capability of the communication system, the network device may transmit data to the terminal device through a plurality of transmission layers. However, when the number of transmission layers increases, the overhead caused by the terminal device performing feedback on a per transmission layer basis also increases by a factor. And the larger the number of sub-bands, the larger the magnitude of the feedback overhead increase. It is therefore desirable to provide a method that reduces the feedback overhead.

In view of the above, the present application provides a method for indicating and determining a precoding vector, so as to reduce the feedback overhead of PMI.

To facilitate understanding of the embodiments of the present application, the following description is made.

First, in the embodiment of the present application, it is assumed that the number of polarization directions of the transmitting antennas is P (P ≧ 1 and is an integer), the number of transmission layers is R (R ≧ 1 and is an integer), and the number of subbands to be reported is N_sb(N_sbIs an integer and is more than or equal to 1).

In the present embodiment, for convenience of description, when referring to numbering, consecutive numbering may be started from 0. For example, the R transport layers may include a 0 th transport layer through an R-1 th transport layer, and the P polarization directions may include a 0 th polarization direction through a P-1 th polarization direction. Of course, the specific implementation is not limited thereto, and for example, the numbers may be consecutively numbered from 1. It should be understood that the above descriptions are provided for convenience of describing the technical solutions provided by the embodiments of the present application, and are not intended to limit the scope of the present application.

Second, in the embodiments of the present application, a specific method for indicating and determining a precoding matrix is described in detail by taking a subband as an example of a frequency domain unit, but this should not be construed as limiting the present application. It should be understood that a subband is only one possible form of a frequency domain unit, which may also be a subcarrier, a Resource Block (RB), etc., and this application is not limited thereto. In addition, the precoding matrix corresponding to the subband according to the embodiment of the present application may be understood as a precoding matrix determined based on a channel matrix of the subband. In the embodiments shown below, the meanings expressed by "precoding matrix corresponding to subband" and "precoding matrix for subband" may be the same without making a special explanation.

Third, in the embodiments of the present application, a plurality of places relate to transformation of a matrix. For ease of understanding, a unified description is provided herein. The superscript T denoting transposition, e.g. A^TRepresents a transpose of a matrix (or vector) a; the upper corner marks represent conjugation, e.g. A^*Represents the conjugate of matrix (or vector) a; the superscript H denotes a conjugate transpose, e.g., A^HRepresenting the conjugate transpose of matrix (or vector) a. Hereinafter, the description of the same or similar cases will be omitted for the sake of brevity.

Fourth, embodiments of the present application relate to Hadamard product operations of matrices. In the embodiment of the present application, Hadamard product operation is available

And (4) showing. For example, the matrix W_aAnd W_pCan be expressed as

The Hadamard product of the two matrices is obtained by multiplying corresponding elements in the two matrices with the same dimensionality. For example, dimension L N_sbOf (2) matrix

And dimension of L × N_sbOf (2) matrix

Calculating Hadamard product to obtain dimension L × N_sbOf (2) matrix

Wherein L is traversed from 0 to L-1, and n is_sbIn the range of 0 to N_sbTraversing the values in-1.

Fifth, the embodiments of the present application relate to projection between vectors. For example, projecting vector a to vector B may be understood as taking the inner product of vector a and vector B.

Sixth, in the embodiments of the present application, "for indicating" may include for direct indicating and for indirect indicating. When a certain indication information is described for indicating a, the indication information may be included to directly indicate a or indirectly indicate a, and does not mean that a is necessarily carried in the indication information.

If the information indicated by the indication information is referred to as information to be indicated, in a specific implementation process, there are many ways of indicating the information to be indicated, for example, but not limited to, directly indicating the information to be indicated, such as the information to be indicated itself or an index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein an association relationship exists 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 the other part of the information to be indicated is known or predetermined. For example, the indication of the specific information may be implemented by means of a predetermined arrangement order of the respective information (e.g., protocol specification), thereby reducing the indication overhead to some extent. Meanwhile, the universal parts of all information can be identified and indicated in a unified mode, so that the indicating overhead caused by independently indicating the same information is reduced. For example, it will be understood by those skilled in the art that the precoding matrix is composed of precoding vectors, and that each precoding vector in the precoding matrix may have the same components in terms of composition or other attributes.

The specific indication method may be any of various existing indication methods, such as, but not limited to, the above indication methods, various combinations thereof, and the like. The specific details of various indication modes can refer to the prior art, and are not described in detail herein. As can be seen from the above description, when a plurality of information of the same type are required to be indicated, for example, different information may be indicated differently. In a specific implementation process, a required indication manner may be selected according to a specific need, and the indication manner selected in the embodiment of the present application is not limited, so that the indication manner related to the embodiment of the present application should be understood to cover various methods that enable a party to be indicated to obtain information to be indicated.

In addition, other equivalent forms of the information to be indicated may exist, for example, a row vector may be represented as a column vector, a matrix may be represented by a transpose of the matrix, a matrix may also be represented as a vector or an array, the vector or the array may be formed by connecting each row vector or column vector of the matrix, and the like. The technical solutions provided in the embodiments of the present application should be understood to cover various forms. For example, reference to some or all of the features in the embodiments of the present application should be understood to encompass various manifestations of such features.

The information to be indicated may be sent together as a whole, or may be sent separately by dividing into a plurality of pieces of sub information, and the sending periods and/or sending timings of these pieces of sub information may be the same or different. Specific transmission method this application is not limited. The sending period and/or sending timing of the sub information may be predefined, for example, predefined according to a protocol, or may be configured by the transmitting end device by sending configuration information to the receiving end device. The configuration information may include, for example and without limitation, one or a combination of at least two of 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 (DCI).

Seventh, the definitions listed in this application for many characteristics (e.g. Hadamard product, PMI, frequency domain unit, beam vector, and weighting coefficient of beam vector, etc.) are only used to explain the functions of the characteristics by way of example, and the details thereof can refer to the prior art.

Eighth, the first, second, third, fourth and various numerical numbers in the embodiments shown below are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. For example, different indication information is distinguished.

Ninth, in the embodiments shown below, "pre-acquisition" may include signaling by the network device or pre-defined, e.g., protocol definition. The "predefined" may be implemented by saving a corresponding code, table, or other means that can be used to indicate the relevant information in advance in the device (for example, including the terminal device and the network device), and the present application is not limited to a specific implementation manner thereof.

Tenth, the term "store" referred to in the embodiments of the present application may refer to a store in one or more memories. The one or more memories may be provided separately or integrated in the encoder or decoder, the processor, or the communication device. The one or more memories may also be provided separately, with a portion of the one or more memories being integrated into the decoder, the processor, or the communication device. The type of memory may be any form of storage medium and is not intended to be limiting of the present application.

Eleventh, the "protocol" referred to in the embodiments of the present application may refer to a standard protocol in the communication field, and may include, for example, an LTE protocol, an NR protocol, and a related protocol applied in a future communication system, which is not limited in the present application.

Twelfth, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (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, wherein a, b and c can be single or multiple.

The method for indicating and determining a precoding vector provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

It should be understood that the methods provided by the embodiments of the present application may be applied to systems that communicate via multiple antenna techniques, such as the communication system 100 shown in fig. 1. The communication system may include at least one network device and at least one terminal device. The network device and the terminal device can communicate through a multi-antenna technology.

It should also be understood that the embodiments shown below do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application, as long as the communication can be performed according to the method provided by the embodiments of the present application by running the program recorded with the code of the method provided by the embodiments of the present application, for example, the execution subject of the method provided by the embodiments of the present application may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.

Hereinafter, the method for indicating and determining a precoding vector provided by the embodiment of the present application is described in detail by taking an interaction between a network device and a terminal device as an example without loss of generality.

Fig. 2 is a schematic flow chart of a method 200 for indicating and determining a precoding vector provided by an embodiment of the present application, shown from the perspective of device interaction. As shown, the method 200 may include steps 210 through 240. The steps in method 200 are described in detail below.

For convenience of understanding, a specific process of the terminal device indicating a precoding vector and the network device determining the precoding vector when the number of transmission layers is 1 and the number of polarization directions of the transmitting antennas is 1 will be described in detail first.

In step 210, the terminal device generates first indication information indicating the L beam vectors and one or more amplitude component vectors, weighting coefficients of the respective amplitude component vectors, one or more phase component vectors, and weighting coefficients of the respective phase component vectors corresponding to each beam vector.

Specifically, the L beam vectors and the weighting coefficients of the L beam vectors on each subband may be used to construct precoding vectors corresponding to each subband. Each beam vector is in N_sbThe set of weighting coefficients on a subband may be referred to as the weighting coefficient vector for this beam vector. The set of weighting coefficients on the respective subbands for each beam vector may comprise a set of amplitude coefficients and a set of phase coefficients. Each beam vector is in N_sbThe set of amplitude coefficients on a subband may be referred to as an amplitude vector. Each beam vector is in N_sbThe set of phase coefficients on a subband may be referred to as a phase vector. Thus, the weight coefficient vector of each beam vector can be decomposed into an amplitude vector and a phase vector.

For any beam vector L (L is greater than or equal to 0 and less than or equal to L-1, L is an integer), the amplitude component vector corresponding to the L-th beam vector and the weighting coefficient of each amplitude component vector can be used to construct the amplitude vector of the weighting coefficient of the L-th beam vector on each subband. The phase component vector corresponding to the l-th beam vector and the weighting coefficients of each phase component vector can be used to construct a phase vector of the weighting coefficients of the l-th beam vector on each subband.

In other words, for each beam vector, the magnitude vector whose weighting coefficients are on the respective subband may be approximately represented as a weighted sum of one or more magnitude component vectors, and the phase vector on the respective subband may be approximately represented as a weighted sum of one or more phase component vectors.

For example, for the l-th beam vector, the magnitude vector and the magnitude component vector may satisfy:

wherein,

a magnitude vector representing a weighting coefficient of the l-th beam vector on each subband,

indicating the number of amplitude component vectors corresponding to the ith beam vector,

denotes the kth_aA vector of the number of amplitude components,

denotes the kth_aThe weighting coefficients of the individual amplitude component vectors,

k_a、

are all integers.

Similarly, for the l-th beam vector, the phase vector and the phase component vector may satisfy:

wherein,

a phase vector representing the weighting coefficients of the l-th beam vector on the respective subband,

indicates the number of phase component vectors corresponding to the l-th beam vector,

denotes the k-th of_pThe phase component vector is then used to determine,

denotes the kth_pThe weighting coefficients of the phase component vectors,

k_p、

are all integers.

Therefore, the terminal device may feed back the L beam vectors and the one or more amplitude component vectors, the weighting coefficients of the respective amplitude component vectors, the one or more phase component vectors and the weighting coefficients of the respective phase component vectors to the network device through the first indication information, so that the network device may determine the precoding vectors of the respective sub-bands.

The following describes in detail a specific process of the terminal device determining L beam vectors, a magnitude component vector of each beam vector, a weighting coefficient of each magnitude component vector, a phase component vector of each beam vector, and a weighting coefficient of each phase component vector, thereby generating the first indication information.

As described previously, when the number of transmission layers is 1, the terminal device may determine an ideal precoding vector for each subband based on the channel matrix for each subband. In one implementation, the terminal device may determine a channel matrix of each subband based on a reference signal, such as CSI-RS, sent by the network device, and perform SVD on the channel matrix of each subband to obtain an ideal precoding vector of each subband, thereby further determining the ideal precoding vector of each subband.

Optionally, the method 200 further includes step 220, the network device transmitting a reference signal. Accordingly, the terminal device receives the reference signal.

The transmit antenna of the network device may be a single polarization directional antenna. That is, the number of polarization directions may be 1, or the polarization directions are not distinguished; it may also be a multi-polarization antenna, i.e. the number of polarization directions is greater than 1, e.g. the number of polarization directions is 2. For ease of understanding only, the specific process of generating the first indication information by the terminal device will be first described in detail by taking the example that the number of polarization directions is equal to 1. The specific process of generating the first indication information by the terminal device when the number of polarization directions is greater than 1 will be described in detail later.

The specific process of step 210 is described in detail below with reference to fig. 3. Fig. 3 is a schematic flow chart of a method for indicating a precoding vector provided in an embodiment of the present application. As shown in the figure, step 210 may specifically include steps 2101 to 2105.

In step 2101, the terminal device determines L beam vectors and a weighting coefficient for each beam vector.

The terminal device may determine the beam vector on a per subband basis or may determine the beam vector on a wideband basis. When the terminal device determines the beam vector on a per subband basis, the beam vectors of any two subbands may be the same, or the beam vectors of at least two subbands may also be different. When the terminal device determines the beam vector based on the wideband, the beam vectors of any two subbands may be the same. The specific method for determining the L beam vectors by the terminal device is not limited in this application.

In this embodiment, the beam vectors of any two subbands may be the same. In one implementation, the terminal device may determine an ideal precoding vector of each subband according to a channel matrix of each subband, and determine L beam vectors according to the ideal precoding vector of each subband and a predefined beam vector set.

Specifically, the terminal device may project the ideal precoding vectors of the respective subbands onto respective vectors in the beam vector set, respectively, to obtain a plurality of projection values. The terminal device may select the stronger L beam vectors from the set of beam vectors depending on the plurality of projection values. The stronger L beam vectors can be understood as L beam vectors with larger weighting coefficients. This is because the beam vector having a large weighting coefficient occupies a large weight in the linear combination, and affects the approximation accuracy of the precoding vector greatly.

In one possible design, the set of beam vectors may include N_txA column vector. Dimension of each column vector is N_txAnd each vector may be taken from a two-dimensional (2dimension, 2D) -DFT matrix. Wherein 2D can represent two different directionsSuch as the horizontal direction and the vertical direction.

The N is_txAny two of the column vectors are orthogonal to each other. N in the set of beam vectors_txThe column vectors can be respectively denoted as

Based on that N_txThe column vectors may form a matrix B_s，

Assuming that the frequency domain occupied bandwidth of the CSI measurement resource contains N_sbSub-band, with n_sb(0≤n_sb≤N_sb-1 and n_sbInteger) subband corresponding ideal precoding vector may be written as

Based on the N_sbIdeal precoding vectors for individual subbands, a space-frequency matrix H can be constructed,

the terminal device may project the ideal precoding vector of each sub-band to each column vector in the beam vector set, respectively, to obtain N_tx×N_sbThe projection values. The N is_tx×N_sbThe projection value may be represented by B_s ^HH is calculated to obtain the dimension N_tx×N_sbEach element in the matrix of (a). The terminal equipment can respectively get the module of each row to obtain the N_txN corresponding to each row_txAnd (4) carrying out die cutting. The terminal equipment can be selected from N according to the size of the module_txThe modulo larger L rows are selected from the individual rows. The modular length of any one of the L rows is greater than or equal to the remaining N_tx-a modulo length of any one of the L rows. The projection values in the selected L rows may be used as weighting coefficients for the L beam vectors.

From B_s ^HExtracting L rows with larger mould from HThe weighting coefficient matrix G may be constructed as follows:

each row in the weighting coefficient matrix G may correspond to a beam vector. The L rows correspond one-to-one with the L beam vectors. Each row vector in the weighting coefficient matrix G may be referred to as a weighting coefficient vector of the corresponding beam vector. N included in each row vector_sbEach element can be linked with N_sbThe sub-bands correspond one to one.

N of the set of beam vectors_txOf the column vectors, L column vectors for generating the L rows having the larger modulus may be set as L beam vectors selected in the spatial domain. I.e. the column in which the L beam vectors in the set of beam vectors are located and B_s ^HThe rows in H where the weighting coefficients of the L beam vectors are located correspond. For example, the sequence number of the column in which the L beam vectors in the beam vector set are located may be B_s ^HH is the serial number of the row where the element in the weighting coefficient matrix G is located. The L beam vectors may correspond one-to-one to L rows in the weighting coefficient matrix G.

In another possible design, the set of beam vectors may be passed through an oversampling factor O_sExpansion to O_s×N_txA column vector. Wherein the oversampling factor O_sIs a positive integer. Specifically, O_s＝O₁×O₂，O₁May be an oversampling factor in the horizontal direction, O₂May be an oversampling factor in the vertical direction. O is₁≥1，O₂≥1，O₁、O₂Are not 1 at the same time and are integers. The dimension of each column vector in the beam vector set is N_txAnd each vector may be taken from an oversampled 2D-DFT matrix.

In this case, the set of beam vectors may be considered to include O_sSubsets each comprising N_txAnd any two column vectors within each subset may be mutually orthogonal. From which the terminal device can receive_sSelecting one of the subsets, selectingThe selected subset includes the selected L beam vectors. For ease of distinction and illustration, the selected subset will be referred to as the first subset.

The terminal device may determine the L beam vectors based on a similar manner as described above. In particular, the o-th of the set of beam vectors_s(0≤o_s≤O_s-1 and o_sIs an integer) of subsets_txThe column vectors can be respectively denoted as

Based on that N_txThe column vectors can construct a matrix

The terminal device may project the ideal precoding vector of each subband to O of the beam vector set respectively_sEach column vector in the subset, resulting in O_sA set of projection values, each set of projection values comprising N_tx×N_sbThe projection values. O that the terminal device can obtain from projection_sAnd determining weighting coefficients of the L beam vectors in the projection values of the group of projection values.

Wherein, the o_sN in the set of projection values_tx×N_sbThe projection value may be

H is calculated to obtain the dimension N_tx×N_sbEach element in the matrix of (a). For the convenience of distinction and description, will be composed of

H is calculated to obtain the dimension N_tx×N_sbIs called the o-th matrix_sA projection matrix of subsets. The terminal equipment can be connected with the slave computer_sO corresponding to each subset_sWeighting coefficients of the L beam vectors are determined in the projection matrix.

In particular, each groupThe projection values may include N_txN lines, from each set of projected values, the terminal device_txSelecting L rows with larger modulus from the rows, wherein the modulus length of any one row in the L rows is larger than or equal to the rest N in the same group of projection values_tx-a modulo length of any one of the L rows. If the modulo length of the L rows is recorded as L larger values, from the above-mentioned O_sThe subsets can get O_sThe larger value. The terminal device may further receive from the O_sAnd determining a group of weighting coefficients as L beam vectors in the larger group of values. E.g. O_sThe sum of the modulo lengths of a set of values of the larger set of values selected for use as the weighting coefficients for the L beam vectors may be greater than or equal to the remaining O_s-1 sum of the modular lengths of any one of the groups.

The weighting coefficient matrix G constructed by the weighting coefficients of the L beam vectors may be the same as that shown above, and for brevity, will not be described again here.

The L column vectors of the set of beam vectors used for generating the weighting coefficients of the L beam vectors may belong to the same subset, i.e. the first subset described above. The column in which the L beam vectors in the first subset are located and

the rows in H where the weighting coefficients of the L beam vectors are located correspond. Wherein, B_sx1 denotes the dimension N constructed from the column vectors in the first subset_tx×N_tx0 < x₁≤O_s-1 and x₁Are integers. The L column vectors of the weighting coefficients used to generate the L beam vectors in the first subset may be the L selected beam vectors in the spatial domain.

The space-frequency vector H can be approximately represented as a weighted sum of the L beam vectors determined in step 2101. If the L beam vectors are respectively recorded as

From the L beam vectors, a matrix U can be constructed_s，

The space-frequency matrix H can be represented by a weighted sum of L beam vectors as H ≈ U_sG. It should be understood that the present application does not limit the order of the L beam vectors.

It should be understood that the weighting coefficient matrix G may be a matrix of coefficients of the respective beam vectors on the respective subbands. The weighting coefficients of the L beam vectors on each subband are arranged to obtain the weighting coefficient matrix G. A specific method for determining the above L beam vectors and the weighting coefficients of the beam vectors on each subband can refer to the prior art. The implementation manners provided in the embodiments of the present application are only examples, and should not limit the present application in any way.

It should also be understood that the weighting coefficient matrix G is shown only for ease of understanding, and does not represent that the terminal device generated the weighting coefficient matrix G in determining the L beam vectors and the weighting coefficients of the respective beam vectors. For example, the terminal device may determine a weighting coefficient vector at each subband separately for each beam vector. For another example, the terminal device may determine only the set of weighting coefficients for each beam vector, and may not necessarily generate the weighting coefficient matrix G or the weighting coefficient vector.

In step 2102, the terminal device determines an amplitude matrix and a phase matrix of the weighting coefficients of the L beam vectors.

Based on the weighting coefficient matrix G determined in step 2101, the terminal device may decompose G into an amplitude matrix and a phase matrix as follows:

that is, the weighting coefficient matrix may be determined by a Hadamard product of the amplitude matrix and the phase matrix. Wherein,

is an amplitude matrix G_a，

Is a phase matrix G_p. That is to say that the first and second electrodes,

each row vector in the magnitude matrix may correspond to a beam vector. The L row vectors correspond to the L beam vectors one-to-one, and each row vector may be referred to as a magnitude vector of the corresponding beam vector. In other words, the magnitude matrix includes magnitude vectors of the L beam vectors. N in each row vector_sbEach element may be related to N_sbThe sub-bands correspond one to one. Thus, the elements in the amplitude matrix

The weighting coefficient which can represent the L (0 ≦ L ≦ L-1, and L is an integer) th beam vector at the n-th_sbAmplitude coefficients of the individual subbands.

Each row vector in the phase matrix may also correspond to a beam vector. The L row vectors correspond one-to-one to the L beam vectors, and each row vector may be referred to as a phase vector of the corresponding beam vector. In other words, the phase matrix includes the phase vectors of the L beam vectors. N in each row vector_sbEach element may be related to N_sbThe sub-bands correspond one to one. Thus, the elements in the phase matrix

The weighting coefficient at the nth beam vector can be expressed_sbPhase coefficients of the individual subbands.

In order to reduce the feedback overhead of the weighting coefficients, the terminal device may compress the amplitude matrix and the phase matrix. The terminal device may indicate each magnitude vector in the magnitude matrix with a weighted sum of one or more magnitude component vectors and each phase vector in the phase matrix with a weighted sum of one or more phase component vectors, respectively.

Based on the amplitude matrix and the phase matrix, the terminal device may determine one or more amplitude component vectors and weighting coefficients of the respective amplitude component vectors corresponding to each beam vector, and one or more phase component vectors and weighting coefficients of the respective phase component vectors corresponding to each beam vector, respectively.

In this embodiment, when the number L of beam vectors is greater than 1, the number of amplitude component vectors corresponding to any two beam vectors may be the same, or the number of amplitude vectors corresponding to at least two beam vectors may be different. The number of phase component vectors corresponding to any two beam vectors may be the same, or the number of phase component vectors corresponding to at least two beam vectors may be different. This is not a limitation of the present application.

Optionally, the number of the amplitude component vectors corresponding to any two beam vectors is the same, and the number of the phase component vectors corresponding to any two beam vectors is the same.

For the same beam vector, the number of corresponding amplitude component vectors may be the same as or different from the number of corresponding phase component vectors, which is not limited in the present application. For example, for the l-th beam vector, the number of corresponding amplitude component vectors may be

(

Is a positive integer), the number of corresponding phase component vectors may be

(

Is a positive integer).

And

the values of (A) may be the same or different. This is not a limitation of the present application.

In summary, the following possible situations exist for the amplitude component vector and the phase component vector corresponding to the L beam vectors:

in the first case, the amplitude component vectors corresponding to any two beam vectors are the same, and the phase components corresponding to any two beam vectors are the same;

in case two, the amplitude components corresponding to at least two beam vectors are the same and different, and the phase component vectors corresponding to at least two beam vectors are different;

in case three, the amplitude component vectors corresponding to any two beam vectors are the same, but the phase component vectors corresponding to at least two beam vectors are different;

in case four, the amplitude component vectors corresponding to at least two beam vectors are different, but the phase component vectors corresponding to any two beam vectors are the same.

The specific process of determining one or more amplitude component vectors and weighting coefficients of each amplitude component vector corresponding to each beam vector in step 2103, the specific process of determining one or more phase component vectors and weighting coefficients of each phase component vector corresponding to each beam vector in step 2104, and the specific process of generating the first indication information in step 2105 will be described in detail below with reference to the above four cases, respectively.

Situation one,

The amplitude component vectors corresponding to any two beam vectors are the same, and the phase component vectors corresponding to any two beam vectors are the same. In this case, the number of amplitude component vectors corresponding to any two beam vectors is the same, for example, denoted as K_a，K_aIs a positive integer. The number of phase component vectors corresponding to any two beam vectors is also the same, for example denoted as K_P，K_PIs a positive integer. K_aAnd K_pThe same or different, and the present application is not limited thereto.

K_aAnd K_pThe values of (a) may be indicated by the network device, or reported by the terminal device, or may be predefined, such as protocol definition. This is not a limitation of the present application.

If K_aIs taken as the value ofAnd indicating by the device, optionally, the method further includes: the network device sends second indication information indicating the number of the amplitude component vectors. Accordingly, the terminal device receives the second indication information. Optionally, the second indication information may be carried in higher layer signaling, such as Radio Resource Control (RRC) message.

If K_aThe value is reported by the terminal device, optionally, the method further includes: and the terminal equipment sends second indication information, wherein the second indication information indicates the number of the amplitude component vectors. Accordingly, the network device receives the second indication information. Optionally, the second indication information may be carried in Uplink Control Information (UCI), such as CSI.

It should be understood that the above-listed signaling for carrying the second indication information is only an example, and should not constitute any limitation to the present application, and the present application does not limit the signaling for carrying the second indication information.

If K_pIs indicated by the network device, optionally, the method further includes: the network device sends third indication information, wherein the third indication information is used for indicating the number of the phase component vectors. Accordingly, the terminal device receives the third indication information. Optionally, the third indication information may be carried in higher layer signaling, such as an RRC message.

If K_pThe value is reported by the terminal device, optionally, the method further includes: the terminal equipment receives third indication information, and the third indication information is used for indicating the number of the phase component vectors. Accordingly, the network device receives the third indication information. Optionally, the third indication information may be carried in UCI, such as CSI.

It should be understood that the signaling for carrying the third indication information listed above is only an example, and should not constitute any limitation to the present application, and the signaling for carrying the third indication information is not limited in the present application.

It should also be understood that the second indication information for indicating the number of amplitude component vectors and the third indication information for indicating the number of phase component vectors may be the same information or different information, and the present application is not limited thereto.

In step 2103, the terminal device determines one or more amplitude component vectors corresponding to each beam vector and a weighting coefficient for each amplitude component vector.

In case one, the terminal device determines K_aThe amplitude component vectors and the weighting coefficients of the amplitude component vectors.

Optionally, K corresponding to each beam vector_aThe individual magnitude component vectors are taken from a predefined set of magnitude component vectors.

Specifically, the terminal device may project each vector in the amplitude matrix onto each vector in the amplitude component vector set, respectively, to obtain a plurality of projection values. The terminal device may select a stronger K from the set of amplitude component vectors based on the plurality of projection values_aA vector of amplitude components. The stronger K_aThe amplitude component vector can be understood as K with a large weighting coefficient_aA vector of amplitude components.

In one possible design, the set of amplitude component vectors may include N_sbA column vector. Dimension of each column vector is N_sb. N in the set of amplitude component vectors_sbThe column vectors can be respectively denoted as

Based on that N_sbThe column vectors may form a matrix B_a，

Alternatively, each element in the set of amplitude component vectors may be a sine function or a cosine function.

For example, for any one column vector

(0≤n_sb≤N_sb-1, and n_sbIs an integer),

or,

from this, a matrix B can be obtained_aE.g. of

Or,

the terminal device may project each amplitude vector in the amplitude matrix to each column vector in the amplitude component vector set, respectively, to obtain lxn_sbThe projection values. The L is multiplied by N_sbThe projection value may be represented by G_aB_aThe calculated dimension is L multiplied by N_sbEach element in the matrix of (a). The terminal device may perform modulo operation on each column in the matrix to obtain N_sbN corresponding to each column_sbA mode, then from N, according to the mode size_sbSelecting modulo-larger K in each column_aAnd (4) columns. The K is_aThe modular length of any one of the columns is greater than or equal to the remaining N_sb-K_aThe modulus length of any one of the columns. Selected K_aThe projection value of each column may be K_aA weighting factor for each amplitude component vector.

From G_aB_aIn which the larger K of the above-mentioned mould is extracted_aFor each column, a weighting coefficient matrix Y of the amplitude component vector can be constructed_aThe following were used:

n of the set of amplitude component vectors_sbIn each column vector, K for generating the above modulus is larger_aK of each column_aThe column vector may be referred to as a magnitude component vector. I.e. K in the set of amplitude component vectors_aA vector of magnitude componentsIn columns and G_aB_aMiddle K_aThe columns in which the weighting coefficients of the amplitude component vectors are located correspond. For example, K in the set of amplitude component vectors_aThe sequence number of the column where each amplitude component vector is located may be G_aB_aMedium weighting coefficient matrix Y_aThe serial number of the column in which the element is located. K_aThe vector of amplitude components may be associated with the weighting factor matrix Y_aK in (1)_aThe columns correspond one to one.

The above amplitude matrix G_aCan be approximately expressed as K determined above_aA weighted sum of the vectors of the amplitude components. If the K amplitude component vectors are respectively recorded as

From the K_aThe vector of each amplitude component can construct a matrix U_a，

Then the amplitude matrix G_aCan pass through K_aThe weighted sum of the individual amplitude component vectors is denoted G_a≈Y_aU_a ^H。

It should be understood that the weighting coefficient matrix Y_aIs shown only for ease of understanding and is not representative of the terminal device determining K_aThe weighting coefficient matrix Y is generated during the process of each amplitude component vector and the weighting coefficient of each amplitude component vector_a. The terminal device may determine only the set of weighting coefficients for each amplitude component vector, and does not necessarily generate the weighting coefficient matrix Y_a。

In another possible design, the set of amplitude component vectors may be passed through an oversampling factor O_aExpansion to O_a×N_sbA column vector. Wherein the oversampling factor O_aIs a positive integer.

In this case, the set of amplitude component vectors may be considered to include O_aSubsets each comprising N_sbAnd any two column vectors within each subset may be mutually orthogonal. From which the terminal device can receive_aSub-unitCollectively selecting a subset, the selected subset including the selected K_aA vector of amplitude components. For ease of distinction and illustration, the selected subset will be referred to as the second subset.

The terminal device may determine K based on a similar manner as described above_aA vector of amplitude components. In particular, the o-th of the set of amplitude component vectors_a(0≤o_a≤O_a-1 and o_aIs an integer) of subsets_sbThe column vectors can be respectively denoted as

Based on that N_sbThe column vectors can construct a matrix

The terminal device may project each amplitude vector in the amplitude matrix to O of the amplitude component vector set respectively_aEach column vector in the subset, resulting in O_aGroups of projection values, each group of projection values comprising LxN_sbThe projection values. O that the terminal device can obtain from projection_aDetermining K among the set of projection values_aA weighting factor for each amplitude component vector.

Wherein, the o_aLxN in group projection values_sbThe projection value may be represented by G_a

Calculating to obtain dimension L multiplied by N_sbEach element in the matrix of (a). For the sake of distinction and explanation, will be indicated by G_a

Calculating to obtain dimension L multiplied by N_sbIs called the o-th matrix_aA projection matrix of subsets. The terminal equipment can be connected with the slave computer_aO corresponding to each subset_aMoment of projectionDetermining K in an array_aA weighting factor for each amplitude component vector.

In particular, each set of projection values may include N_sbColumns, from each set of projected values N, the terminal device can project_sbSelecting modulo-larger K in each column_aA row of, the K_aThe modulo length of any one of the columns is greater than or equal to the remaining N in the same set of projection values_sb-K_aThe modulus length of any one of the columns. If it is to be K_aThe length of the die of each row is denoted as K_aA greater value of O from above_aThe subsets can get O_aThe larger value. The terminal device may be further based on the O_aDetermining K among larger sets of values_aThe vector of amplitude components and their weighting coefficients.

E.g. from O_aDetermining a set of values from the larger set of values, the sum of the set of values (i.e., K)_aThe sum of the modulo lengths of the column projection values) may be greater than or equal to the remainder of O_a-1 sum of the values of any one of the groups. K corresponding to the set of values_aThe column projection value may be K_aA weighting factor for each amplitude component vector.

The K is_aWeighting coefficient matrix Y constructed by weighting coefficients of amplitude component vectors_aMay be the same as that shown above and will not be described here for brevity.

Use in a set of amplitude component vectors for generating K_aK of weighting coefficients of amplitude component vectors_aThe column vectors may belong to the same subset, i.e. the second subset described above. K in the second subset_aThe column in which the amplitude component vector is located and G_a

Middle K_aThe columns in which the weighting coefficients of the amplitude component vectors are located correspond. Wherein,

representing a dimension N constructed from the column vectors in the second subset_sb×N_sb0 < x₂≤O_a-1 and x₂Are integers. In the second subset for generating K_aK of weighting coefficients of amplitude component vectors_aThe column vector may be K_aA vector of amplitude components.

It is to be understood that the above-listed determinations of K_aThe implementation of the amplitude component vectors and the weighting coefficients of the amplitude component vectors are merely examples, and should not limit the present application in any way. Determining K for terminal equipment_aThe specific implementation of the individual amplitude component vectors and the weighting coefficients of the individual amplitude component vectors is not limited.

In step 2104, the terminal device determines one or more phase component vectors corresponding to each beam vector and a weighting coefficient for each phase component vector.

In case one, the terminal device determines K_pA plurality of phase component vectors and a weighting factor for each phase component vector.

Optionally, K corresponding to each beam vector_pThe phase component vectors may be taken from a predefined set of phase component vectors.

In one possible design, the set of phase component vectors may include N_sbEach column vector may be a phase component vector. Dimension of each column vector is N_sb. N in the set of phase component vectors_sbThe column vectors can be respectively denoted as

Based on that N_sbThe column vectors may form a matrix B_p，

Optionally, each column vector in the set of phase component vectors is taken from a DFT matrix. The N is_sbAny two of the column vectors are orthogonal to each other. For example, for any one column vector

(0≤n_sb≤N_sb-1, and n_sbIs an integer),

from this, a matrix B can be obtained_pE.g. of

The terminal device may project each phase vector in the phase matrix to each column vector in the phase component vector set, respectively, to obtain lxn_sbThe projection values. The L is multiplied by N_sbThe projection value may be represented by G_pB_pThe calculated dimension is L multiplied by N_sbEach element in the matrix of (a). The terminal equipment can respectively get the modulus of each column to obtain the modulus N_sbN corresponding to each column_sbAnd (4) carrying out die cutting. The terminal device may be configured to select N from the N according to the mode size_sbSelecting modulo-larger K in each column_pAnd (4) columns. The K is_pThe modular length of any one of the columns is greater than or equal to the remaining N_sb-K_pThe modulus length of any one of the columns. Selected K_pThe projection value of each column may be K_pWeighting coefficients of the phase component vectors.

From G_pB_pIn which the larger K of the above-mentioned mould is extracted_pFor each column, a weighting coefficient matrix Y of the amplitude component vector can be constructed_pThe following were used:

n of the set of phase component vectors_sbIn each column vector, K for generating the above modulus is larger_pK of each column_pThe column vector may be referred to as a phase component vector. I.e. the column in which J phase component vectors of the set of phase component vectors lie and G_pB_pMiddle K_pThe column in which the weighting coefficients of the phase component vectors are located corresponds. For example, K in the set of phase component vectors_pThe rank of the column in which the phase component vector is located may be G_pB_pMedium weighting coefficient matrix Y_pThe serial number of the column in which the element is located. K_pG_pB_pThe component vectors may be associated with the weighting factor matrix Y_pK in (1)_pThe rows correspond one to one.

The above phase matrix G_pCan be approximately expressed as K determined above_pA weighted sum of the vectors of phase components. If the above K is equal to_pThe phase component vectors are respectively denoted as

From the K_pThe phase component vectors may construct a matrix U_p，

Then the phase matrix G_pCan pass through K_pThe weighted sum of the phase component vectors is denoted as G_p≈Y_pU_p ^H。

In another possible design, the set of phase component vectors may be passed through an oversampling factor O_pExpansion to O_p×N_sbA column vector. Wherein the oversampling factor O_pIs a positive integer. Optionally, each column vector in the set of phase component vectors is taken from an oversampled DFT matrix.

In this case, the set of phase component vectors may be considered to include O_pSubsets each comprising N_sbA column vector, and any two column vectors within each subset maySo as to be orthogonal to each other. From which the terminal device can receive_pSelecting one of the subsets, the selected subset including the selected K_pA phase component vector. For ease of distinction and illustration, the selected subset will be referred to as the third subset.

The terminal device may determine K based on a similar manner as described above_pA phase component vector. In particular, the o-th of the set of phase component vectors_p(0≤o_p≤O_p-1 and o_pIs an integer) of subsets_sbThe column vectors can be respectively denoted as

Based on that N_sbThe column vectors can construct a matrix

The terminal device may project each phase vector in the phase matrix to O of the set of phase component vectors, respectively_pEach column vector in the subset, resulting in O_pGroups of projection values, each group of projection values comprising LxN_sbThe projection values. O that the terminal device can obtain from projection_pDetermining K among the set of projection values_pWeighting coefficients of the phase component vectors.

Wherein, the o_pLxN in group projection values_sbThe projection value may be represented by G_p

Calculating to obtain dimension L multiplied by N_sbEach element in the matrix of (a). For convenience of distinction and explanation, will be represented by G_p

The calculated dimension is L multiplied by N_sbIs called the o-th matrix_pA projection matrix of subsets. The terminal equipment canTo be derived from and O_pO corresponding to each subset_pDetermining K in a projection matrix_pWeighting coefficients of the phase component vectors.

In particular, each projection matrix may include N_sbColumns from which the terminal device can project N of the matrix_sbSelecting modulo-larger K in each column_pA row of, the K_pThe modular length of any one of the columns is greater than or equal to the remaining N_sb-K_pThe modulus length of any one of the columns. If it is to be K_pThe length of the die of each row is denoted as K_pA greater value of O from above_pThe subsets can get O_pThe larger value. The terminal device may be further based on the O_pDetermining K among larger sets of values_pThe phase component vectors and their weighting coefficients.

E.g. O_pDetermining a set of values from the larger set of values, the sum of the set of values (i.e., K)_pThe sum of the modulo lengths of the column projection values) may be greater than or equal to the remainder of O_p-K_pThe sum of any one of the set values. The column projection value corresponding to this set of values may be taken as K_pWeighting coefficients of the phase component vectors.

The K is_pWeighting coefficient matrix Y constructed by weighting coefficients of phase component vectors_pMay be the same as that shown above and will not be described here for brevity.

Generation of K in sets of phase component vectors_pK of weighting coefficients of phase component vectors_pThe column vectors may belong to the same subset, i.e. the third subset described above. K in the third subset_pThe column in which the phase component vector is located and G_p

Middle K_pThe column in which the weighting coefficients of the phase component vectors are located corresponds. Wherein,

representing a dimension N constructed from the column vectors in the third subset_sb×N_sb0 < x₃≤O_p-1 and x₃Are integers. In the third subset for generating K_pK of weighting coefficients of phase component vectors_pThe column vector may be K_pA phase component vector.

From the K_pThe phase component vectors may construct a matrix U_p，

In yet another possible design, the set of phase component vectors may include N_sbEach column vector may be a phase component vector. Each column vector may be of length N_sb. Each column vector may include N_sbThe phase angle. N in the set of phase component vectors_sbThe column vectors can be respectively denoted as

Based on that N_sbThe column vectors may form a matrix B_p，

Optionally, N in the same column vector_sbThe phase angles may form an arithmetic series of N in any two column vectors_sbThe tolerance of the series of equal difference numbers formed by the phase angles is different. For any column vector

(0≤n_sb≤N_sb-1, and n_sbIs an integer),

is shown with

The tolerance for each column vector may be any real number.

From this, a matrix B can be obtained_p，

Phase matrix G_pCan be represented by an angle matrix Φ: namely, it is

Each row in the angle matrix may be referred to as an angle vector.

The terminal device may project each angle vector in the angle matrix to each column vector in the phase component vector set, respectively, to obtain lxn_sbThe projection values. The L is multiplied by N_sbThe projection value may be represented by Φ B_pThe calculated dimension is L multiplied by N_sbEach element in the matrix of (a). The terminal equipment can respectively get the modulus of each column to obtain the modulus N_sbN corresponding to each column_sbAnd (4) carrying out die cutting. The terminal device may be configured to select N from the N according to the mode size_sbSelecting modulo-larger K in each column_pAnd (4) columns. The K is_pThe modular length of any one of the columns is greater than or equal to the remaining N_sb-K_pThe modulus length of any one of the columns. Selected K_pThe projection value of each column may be K_pWeighting coefficients of the phase component vectors. Thus, from Φ B_pIn which the larger K of the above-mentioned mould is extracted_pFor each column, a weighting coefficient matrix Y of the phase component vector can be constructed_p。

N of the set of phase component vectors_sbIn each column vector, K for generating the above modulus is larger_pK of each column_pThe column vector may be referred to as a phase component vector. I.e. K in the set of phase component vectors_pColumn in which the phase component vector is located and Φ B_pMiddle K_pThe column in which the weighting coefficients of the phase component vectors are located corresponds. For example, K in the set of phase component vectors_pThe rank of the column in which the phase component vector is located may be Φ B_pMedium weighting coefficient matrix Y_pThe serial number of the column in which the element is located. K_pThe phase component vector may be associated with the weighting factor matrix Y_pK in (1)_pThe columns correspond one to one.

If the above K is equal to_pThe phase component vectors are respectively denoted as

Then by the K_pThe phase component vectors may construct a matrix U_p，

Phase matrix G_pCan still pass through K_pThe weighted sum of the phase component vectors is represented as

In the above formula, the matrix G_pEach element in (1) and matrix Y_pU_p ^HThe elements in the corresponding positions have a one-to-one correspondence. Suppose Y_pU_p ^HThe m-th row and n-th column element in (1) can be named as A [ m, n ]]Then G is_pThe mth row and nth column element in (1) may be ejA [ m, n]. Hereinafter, the description of the same or similar cases will be omitted for the sake of brevity.

It should be understood that the weighting coefficient matrix Y_pAre shown for ease of understanding only and are not intended to represent that the terminal device is determining K_pThe weighting coefficient matrix Y is generated from the phase component vectors and the weighting coefficients of the phase component vectors_p. The terminal device may have determined only the phasesA set of weighting coefficients of the bit component vector, and the weighting coefficient matrix Y is generated_p。

In another possible design, the set of phase component vectors may be passed through an oversampling factor O_pExpansion to O_pA subset of which the oversampling factor O_pBeing positive integers, each subset comprising N_sbAnd the tolerances corresponding to any two column vectors within each subset are different. From which the terminal device can receive_pSelecting one of the subsets, the selected subset including the selected K_pA phase component vector. For ease of distinction and illustration, the selected subset will be referred to as the third subset.

The terminal device may determine K based on a similar manner as described above_pA phase component vector and a weighting factor for each phase component vector. Since the terminal device has been based on O in the set of amplitude component vectors as described above_aSubset determination K_aThe detailed description of the specific process of each amplitude component vector and the weighting coefficient of each amplitude component vector is given, and the detailed description of the specific process is omitted here for the sake of brevity.

Then by the K_pThe phase component vectors may construct a matrix U_p，

In step 2105, the terminal device generates first indication information.

The terminal device may determine K in step 2013 based on the L beam vectors determined in step 2101_aIndividual amplitude component vector and weighting coefficient of each amplitude component vectorAnd K determined in step 2104_pThe phase component vectors and the weighting coefficients of the phase component vectors generate first indication information.

Based on the L beam vectors determined in step 2101 above, the terminal device may determine information indicating the L beam vectors. Since the L beam vectors are taken from a predefined set of beam vectors, the first indication information, when used for indicating the L beam vectors, can be specifically used for indicating the positions of the L beam vectors in the set of beam vectors.

Optionally, the set of beam vectors includes a plurality of mutually orthogonal column vectors two by two, and the L beam vectors may be taken from the set of beam vectors. The first indication information, when used for indicating the L beam vectors, may be specifically used for indicating an index of the combination of the L beam vectors in the beam vector set. For example, the protocol may predefine multiple combinations of multiple beam vectors, each combination may correspond to an index, and the L beam vectors may be one of the multiple combinations, or, close to one of the multiple combinations, the terminal device may indicate the L beam vectors by the indexes of the combinations.

It should be understood that indicating L beam vectors by an index indicating a combination of L beam vectors is only one possible implementation and should not constitute any limitation to the present application. For example, when the first indication information indicates the L beam vectors, the first indication information may also be used to indicate an index of each beam vector of the L beam vectors in the beam vector set. The present application is not limited to the specific manner of indicating the L beam vectors.

Optionally, the set of L beam vectors may comprise a plurality of subsets, and the beam vectors in each subset may be mutually orthogonal two by two. The L beam vectors may be taken from a subset, such as the first subset, of the set of beam vectors. The first indication information, when used for indicating the L beam vectors, may be specifically used for indicating the first subset and indexes of the L beam vectors in the first subset. The index of the L beam vectors in the first subset may be, for example, an index of a combination of the L beam vectors, or an index of the L beam vectors, which is not limited in this application.

K based on each of the L beam vectors determined in step 2103 above_aThe terminal device can determine a vector indicating K corresponding to each beam vector_aInformation of the individual amplitude component vectors. Since in case one, any two beam vectors correspond to K_aThe amplitude component vectors are the same, and the first indication information is used for indicating K corresponding to each beam vector_aK may be indicated only once for each magnitude component vector_aThe amplitude component vectors are not required to be respectively indicated for each beam vector, so that unnecessary overhead caused by repeated indication can be avoided.

Due to the K_aThe amplitude component vector is taken from a predefined set of amplitude component vectors, and the first indication information is used for indicating the K_aWhen an amplitude component vector is present, it is particularly useful to indicate the K_aThe position of an amplitude component vector in the set of amplitude component vectors.

Optionally, the set of amplitude component vectors comprises a plurality of mutually orthogonal column vectors, K_aAn amplitude component vector may be taken from the set of amplitude component vectors. The first indication information is used for indicating the K_aWhen an amplitude component vector is present, it is particularly useful to indicate the K_aThe combination of the amplitude component vectors is the index in the set of amplitude component vectors. For example, the protocol may predefine multiple combinations of multiple amplitude component vectors, each combination corresponding to an index, K_aThe amplitude component vector may be one of the plurality of combinations or, close to one of the plurality of combinations, the terminal device may indicate the K by an index of the combination_aA vector of amplitude components.

It is to be understood that by indicating K_aIndex of combination of amplitude component vectors to indicate K_aThe amplitude component vector is only one possible implementation and should not be construed as limiting the application in any way. For example, the first indication information indicates the K_aWhen a vector of magnitude components is present, it can also be used to indicate the K_aAn amplitude component ofThe index of each magnitude component vector in the set of magnitude component vectors. This application is for indication K_aThe specific manner of the individual amplitude component vectors is not limited.

Alternatively, the K_aThe sets of amplitude component vectors may comprise a plurality of subsets, and the beam vectors in each subset may be mutually orthogonal two by two. The K is_aThe amplitude component vectors may be taken from a subset, such as the second subset, of the set of amplitude component vectors. The first indication information is used for indicating the K_aA vector of amplitude components, in particular for indicating the second subset and the K_aAn index of each magnitude component vector in the second subset. The K is_aThe index of a magnitude component vector in the second subset may be, for example, the K_aAn index of a combination of the amplitude component vectors, or the K_aThe index of each amplitude component vector is not limited in this application.

Based on K determined in step 2103 above_aThe weighting coefficient of each of the plurality of amplitude component vectors, and the terminal device may determine information indicating the weighting coefficient of each of the amplitude component vectors.

Alternatively, the terminal device may be based on the weighting coefficient matrix Y_aIndicating the weighting coefficient matrix Y by normalization_aOf the elements (a).

As previously mentioned, the weighting coefficient matrix may include LxK_aAnd (4) each element. In one implementation, the terminal device may be selected from the LxK_aThe weight coefficient with the largest modulus (e.g., denoted as the largest coefficient) is determined among the elements and indicates the position of the largest coefficient in the weight coefficient matrix Y (e.g., the serial number of the row and the serial number of the column of the largest coefficient in the coefficient matrix). Then, the terminal device may further indicate a relative value of the largest weighting coefficient (e.g. denoted as intra-row largest coefficient) corresponding to the largest coefficient in each row of the weighting coefficient matrix, and a relative value of the other weighting coefficients of each row with respect to the intra-row largest coefficient of the same row; alternatively, the terminal device may further indicate the weight coefficient modulo maximum of each column in the weight coefficient matrix (e.g., as a column)Inner largest coefficient) relative to the largest coefficient, and the relative values of the other weighting coefficients of each column relative to the largest coefficient within the column of the same column.

In another implementation, the terminal device may select from the LxK_aDetermining the weight coefficient with the largest modulus (i.e. the maximum coefficient) in each element, and indicating that the maximum coefficient is in the weight coefficient matrix Y_aE.g., the serial number of the row and the serial number of the column of the largest coefficient in the coefficient matrix. The terminal device may then further indicate the weighting coefficient matrix Y_aThe relative value of the other weighting coefficients with respect to the maximum coefficient.

Alternatively, the terminal device may assign 1 to the maximum coefficient and indicate the relative values of the other weighting coefficients in the weighting coefficient matrix with respect to the maximum coefficient. The terminal device may indicate the maximum coefficient by 1 and indicate the relative values of the other weighting coefficients.

The plurality of relative values may be indicated by an index of the quantized value of each relative value. For example, a one-to-one correspondence relationship between a plurality of quantized values and a plurality of indices may be predefined in the codebook, and the terminal device may feed back, to the network device, an index corresponding to the relative value of each of the coefficients described above or an index close to the relative value of each of the weighting coefficients based on the one-to-one correspondence relationship. Accordingly, each weighting coefficient indicated by the terminal device may be the same as or close to the weighting coefficient determined in step 2103, and is therefore referred to as a quantized value of the weighting coefficient.

As mentioned above, the weighting coefficient matrix Y_aIt is shown only for convenience of understanding that the terminal device does not necessarily generate the weighting coefficient matrix Y in determining the weighting coefficient of each amplitude component vector_a. However, as already explained above in step 2103, the weighting factor for each magnitude component vector may be selected from G_aB_aMiddle extraction K_aOne column is obtained. The terminal equipment can be in the slave G according to each weighting coefficient_pB_pExtracted K_pThe positions in the individual columns are indicated according to a predefined sequence, e.g. by rows and then columns, or by columns and then rows, based on the above-mentioned groupingThe normalization means in turn indicates the weighting coefficients of the respective amplitude component vectors. The network device may also recover the weighting coefficients of the amplitude component vectors based on the same order.

It should be understood that indicating the weighting coefficients of the respective magnitude component vectors based on normalization is only one possible implementation and should not constitute any limitation to the present application. For example, the terminal device may also feed back each column or each row in the weighting coefficient matrix Y through a predefined coefficient codebook, e.g., the predefined coefficient codebook includes a plurality of column vectors (or row vectors), and each column vector (or row vector) may correspond to one index. The terminal device may apply the weighting coefficient matrix Y_aEach column (or row) in (1) looks for the closest column (or row) vector in the coefficient codebook and feeds back by index.

K based on each of the L beam vectors determined in step 2104 above_pWith respect to the phase component vectors, the terminal device may determine a vector indicating K corresponding to each beam vector_pInformation of the phase component vectors. Since in case one, any two beam vectors correspond to K_pThe phase component vectors are identical, and the first indication information is used for indicating K corresponding to each beam vector_pWith a phase component vector, K may be indicated only once_pPhase component vectors are used without separately indicating each beam vector, thereby reducing unnecessary overhead caused by repeated indication.

Due to the K_pThe phase component vector is taken from a predefined set of phase component vectors, the first indication being used to indicate K_pWhen a phase component vector is used, it is particularly useful to indicate the K_pThe position of a phase component vector in the set of phase component vectors.

Optionally, the set of phase component vectors comprises a plurality of mutually orthogonal column vectors, K_pA phase component vector may be taken from the set of phase component vectors. The first indication information is used for indicating the K_pWhen a phase component vector is used, it is particularly useful to indicate the K_pThe combination of the phase component vectors at the phaseIndices in the component vector set. For example, the protocol may predefine multiple combinations of multiple phase component vectors, each combination corresponding to an index, K_pThe phase component vector may be or may be close to one of the plurality of combinations, and the terminal device may indicate the K by an index of the combination_pA phase component vector.

It is to be understood that by indicating K_pIndicating K with the index of the combination of phase component vectors_pThe phase component vector is only one possible implementation and should not be construed as limiting the application in any way. For example, the first indication information indicates the K_pA vector of phase components, can also be used to indicate the K_pAn index of each of the phase component vectors in the set of phase component vectors. This application is for indication K_pThe specific manner of the individual phase component vectors is not limited.

Alternatively, the K_pThe set of phase component vectors may include a plurality of subsets, and the beam vectors in each subset may be mutually orthogonal two by two. The K is_pThe phase component vectors may be taken from a subset of the set of phase component vectors, such as a third subset. The first indication information is used for indicating the K_pA phase component vector, in particular for indicating the third subset and the K_pAn index of the phase component vector in the third subset. The K is_pThe index of the phase component vector in the third subset may be, for example, the K_pAn index of a combination of phase component vectors, or the K_pThe index of the phase component vector is not limited in this application.

Based on K determined in step 2104 above_pThe terminal device may determine information indicating the weighting coefficient of each of the phase component vectors, with respect to the weighting coefficient of each of the phase component vectors.

Alternatively, the terminal device may be based on the weighting coefficient matrix Y_pIndicating the weighting coefficient matrix Y by normalization_pOf the elements (a).

As previously describedThe weighting coefficient matrix may include L × K_pAnd (4) each element. In one implementation, the terminal device may be selected from the LxK_pDetermining the weight coefficient with the largest modulus (e.g. as the largest coefficient) among the elements and indicating that the largest coefficient is in the weight coefficient matrix Y_pE.g., the serial number of the row and the serial number of the column of the largest coefficient in the coefficient matrix. Then, the terminal device may further indicate a relative value of the largest weighting coefficient (e.g. denoted as intra-row largest coefficient) corresponding to the largest coefficient in each row of the weighting coefficient matrix, and a relative value of the other weighting coefficients of each row with respect to the intra-row largest coefficient of the same row; alternatively, the terminal device may further indicate a relative value of each column modulo the largest weighting coefficient (for example, referred to as the intra-column largest coefficient) in the weighting coefficient matrix with respect to the largest coefficient, and a relative value of the other weighting coefficients of each column with respect to the intra-column largest coefficient of the same column.

In another implementation, the terminal device may select from the LxK_pDetermining the weight coefficient with the largest modulus (i.e. the maximum coefficient) in each element, and indicating that the maximum coefficient is in the weight coefficient matrix Y_pE.g., the serial number of the row and the serial number of the column of the largest coefficient in the coefficient matrix. The terminal device may then further indicate the weighting coefficient matrix Y_pThe relative value of the other weighting coefficients with respect to the maximum coefficient.

The plurality of relative values may be indicated by an index of the quantized value of each relative value. For example, a one-to-one correspondence relationship between a plurality of quantized values and a plurality of indices may be predefined in the codebook, and the terminal device may feed back, to the network device, an index corresponding to the relative value of each of the coefficients described above or an index close to the relative value of each of the weighting coefficients based on the one-to-one correspondence relationship. Therefore, each weighting coefficient indicated by the terminal device may be the same as or close to the weighting coefficient determined in step 2104, and is therefore referred to as a quantized value of the weighting coefficient.

As mentioned above, the weighting coefficient matrix Y_pThe terminal device is shown in determining the weighting coefficients of the phase component vectors only for ease of understanding, andthe weighting coefficient matrix Y is not necessarily generated_p. However, as already explained above in step 2103, the weighting coefficients for each phase component vector may be selected from G_pB_pMiddle extraction K_pOne column is obtained. The terminal equipment can be in the slave G according to each weighting coefficient_pB_pExtracted K_pThe positions in the individual columns are sequentially assigned the weighting coefficients of the phase component vectors based on the normalization described above according to a predefined order, e.g., first assigned by row and then by column, or first assigned by column and then by row. The network device may also recover the weighting coefficients for each phase component vector based on the same order.

It should be understood that indicating the weighting coefficients of the phase component vectors based on normalization is only one possible implementation and should not constitute any limitation to the present application. For example, the terminal device may also apply the weighting coefficient matrix Y_pEach column (or each row) in (a) is fed back through a predefined coefficient codebook, e.g. the predefined coefficient codebook comprises a plurality of column vectors (or row vectors), each column vector (or row vector) may correspond to an index. The terminal device may apply the weighting coefficient matrix Y_pEach column (or each row) in (1) finds the closest column vector (or row vector) in the coefficient codebook and feeds back by index.

The second case,

The amplitude components corresponding to the at least two beam vectors are the same and different, and the phase component vectors corresponding to the at least two beam vectors are different. In this case, the number of amplitude component vectors and the number of phase component vectors corresponding to each beam vector may be defined separately. For example, the number of amplitude component vectors corresponding to the l-th beam vector may be written as

Is a positive integer. The number of phase component vectors corresponding to the l-th beam vector can be written, for example, as

Is a positive integer. For any one beam directionThe number of the amplitude component vectors and the number of the phase component vectors may be the same or different, and the present application does not limit this.

The number of the amplitude component vectors and the number of the phase component vectors corresponding to each beam vector may be indicated by the network device, or reported by the terminal device, or predefined, such as defined by a protocol.

If the number of amplitude component vectors and the number of phase component vectors corresponding to each beam vector are indicated by the network device, optionally, the method further includes: the network device sends second indication information, wherein the second indication information is used for indicating the number of the amplitude component vectors of each beam vector. Accordingly, the terminal device receives the second indication information. Optionally, the second indication information may be carried in higher layer signaling, such as an RRC message.

If the number of the amplitude component vectors and the number of the phase component vectors corresponding to each beam vector are reported by the terminal device, optionally, the method further includes: and the terminal equipment sends second indication information, wherein the second indication information is used for indicating the number of the amplitude component vectors of each beam vector. Accordingly, the network device receives the second indication information. Optionally, the second indication information may be carried in UCI, such as CSI.

If the number of phase component vectors corresponding to each beam vector is indicated by the network device, optionally, the method further includes: and the network equipment transmits third indication information, wherein the third indication information is used for indicating the number of the phase component vectors corresponding to each beam vector. Accordingly, the terminal device receives the third indication information. Optionally, the third indication information may be carried in higher layer signaling, such as an RRC message.

If the number of the phase component vectors and the number of the phase component vectors corresponding to each beam vector are reported by the terminal device, optionally, the method further includes: the terminal device transmits third indication information, wherein the third indication information is used for indicating the number of the phase component vectors of each beam vector. Accordingly, the network device receives the third indication information. Optionally, the third indication information may be carried in UCI, such as CSI.

It should also be understood that since the number of amplitude component vectors and the number of phase component vectors are indicated separately for each beam vector, the information indicating the number of amplitude component vectors of L beam vectors may be one or more; the information indicating the number of phase component vectors of the L beam vectors may be one or more. The information of the number of amplitude component vectors and the information of the phase component vectors of the same beam vector may be indicated by the same information or may be indicated by different information. This is not a limitation of the present application.

The terminal device may determine one or more amplitude component vectors corresponding to each beam vector and a weighting coefficient of each amplitude component vector from a predefined set of amplitude component vectors. That is, optionally, the one or more amplitude component vectors corresponding to each beam vector are taken from a predefined set of amplitude component vectors.

The details of the amplitude component vector set have been described in detail in the above case one, and are not described herein again for brevity.

Specifically, the terminal device may repeatedly perform the following operations to determine the value corresponding to the L-th beam vector by taking the value of L through the range from 0 to L-1

Each amplitude is divided intoA vector of magnitudes and a weighting factor for each vector of magnitude components.

The terminal device may determine the magnitude vector corresponding to the l-th beam vector from the magnitude matrix determined in step 2102

The magnitude vector may be denoted as g, for example_a，l，

The terminal device may assign a magnitude vector ga corresponding to the l-th beam vector,_lthe projection is performed to each column vector in the amplitude component vector set to obtain a plurality of projection values. The terminal device may further determine a stronger one from the set of amplitude component vectors based on the plurality of projection values

A vector of amplitude components. The stronger

The magnitude component vector can be understood as the vector with a larger weighting coefficient

A vector of amplitude components.

In one possible design, the set of magnitude component vectors includes N_sbA column vector, each having a dimension of N_sb. Any two column vectors in the set of magnitude component vectors may be orthogonal to each other.

The terminal device may transmit the magnitude vector ga,_lprojecting to each column vector in the amplitude component vector set to obtain N_sbThe projection values. According to the N_sbThe size of the module length of the projection value is selected to be larger

The projection values. The mould being large

The modulus of any one of the projection values is greater than or equal to the others

Any one of the projection values modulo. The modulus selected being larger

The projection values can be respectively

A weighting factor for each amplitude component vector.

At N of the set of amplitude component vectors_sbOf column vectors used to generate the above modulo larger

Of a projection value

The column vector may be referred to as a magnitude component vector. I.e. the set of amplitude component vectors

The column in which each amplitude component vector is located and the set of amplitude component vectors are used for generating the signal with larger modulus

Of a projection value

The columns in which the column vectors are located correspond. E.g. in the set of amplitude component vectors

The sequence number of the column in which each amplitude component vector is located may be the sequence number used to generate the larger modulus in the set of amplitude component vectors

Of a projection value

The sequence number of the column in which the column vector is located.

The amplitude component vector can be compared with

The weighting coefficients correspond one to one.

In another possible design, the set of amplitude component vectors may be passed through an oversampling factor O_aExpansion to O_a×N_sbA column vector. Wherein the oversampling factor O_aIs a positive integer. That is, the magnitude component vector may include O_aSubsets each comprising N_sbAnd any two column vectors within each subset may be mutually orthogonal.

The terminal device may transmit the magnitude vector ga,_lrespectively projected to O in the amplitude component vector set_aRespective column vectors of the subsets to obtain O_aEach set of projection values may include N_sbThe projection values. O that the terminal device can obtain from projection_aDetermination in group of projection values

A weighting factor for each amplitude component vector. For example, the terminal device may be selected from_aDetermining the larger module in each group of projection values of the group of projection values

The projection values. The norm is larger in each set of projection values

The modular length of one projection value is greater than or equal to the rest of the projection values in the same group

Any one of the projection valuesDie length of (2). If it is to be used

Recording the modulo length of a projection value

A greater value of O from above_aThe subsets can get O_aThe larger value. The terminal device may further receive from the O_aDetermining one of the larger values as

A weighting factor for each amplitude component vector. E.g. O_aSelected as the larger of the set of values

The sum of the modulo lengths of a set of values of the weighting coefficients of the individual amplitude component vectors may be greater than or equal to the remaining O_a-1 sum of the modular lengths of any one of the groups.

For generating in a set of amplitude component vectors

Of weighting coefficients of vectors of amplitude components

The column vectors may belong to the same subset, i.e. the second subset described above. In the second subset

The column in which the amplitude component vector is located and the second subset are used to generate the modulo-larger

Of a projection value

The columns in which the column vectors are located correspond. E.g. in the second subset

The rank of the column in which each magnitude component vector lies may be used to generate the modulo larger in the second subset

Of a projection value

The sequence number of the column in which the column vector is located.

The amplitude component vector can be compared with

The weighting coefficients correspond one to one.

Based on the above-described method, the terminal device may determine one or more amplitude component vectors corresponding to each of the L beam vectors and a weighting coefficient of each amplitude component vector, respectively.

It is to be understood that the determinations enumerated above

The implementation of the amplitude component vectors and the weighting coefficients of the amplitude component vectors are merely examples, and should not limit the present application in any way. The application determines for a terminal device

The specific implementation of the individual amplitude component vectors and the weighting coefficients of the individual amplitude component vectors is not limited.

In another possible implementation, the terminal device may directly indicate the magnitude vector of each beam vector. That is, the number of amplitude component vectors per beam vector is 1, and the weighting coefficient is also 1. For example, the terminal device may indicate elements in each magnitude vector to the network device. For example, the terminal device and the network device may define in advance a one-to-one correspondence relationship between a plurality of quantized values and a plurality of indexes, and the terminal device may indicate each element in each amplitude vector or an index close to the quantized value of each element to the network device, so that the network device recovers each amplitude vector based on the index of each quantized value. For another example, the terminal device may indicate each magnitude vector to the network device. This is equivalent to not compressing the amplitude matrix.

The terminal device can determine K through any one of the following two implementation manners_pIndividual phase component vectors and weighting coefficients for each phase component vector:

first implementation, determining K according to a phase vector of each beam vector and a predefined set of phase component vectors_pEach phase component vector and a weighting coefficient of each phase component vector;

and the second implementation mode is that a linear fitting mode is adopted to determine the phase vector of each beam vector.

Both implementations are described in detail below.

The first implementation mode,

The first implementation is detailed in case one. This implementation is equally applicable in case two.

Specifically, the terminal device may determine one or more phase component vectors corresponding to each beam vector and a weighting coefficient of each phase component vector according to a predefined set of phase component vectors. That is, optionally, the one or more phase component vectors corresponding to each beam vector are taken from a predefined set of phase component vectors.

The specific content of the phase component vector set has been described in detail in the above case one, and is not described herein again for brevity.

A plurality of phase component vectors and a weighting factor for each phase component vector.

The terminal device may determine a phase vector corresponding to the l-th beam vector from the phase matrix determined in step 2102

The phase vector may be denoted g, for example_p，l，

The terminal device may assign a phase vector g corresponding to the l-th beam vector_p，lThe projection is performed on each column vector in the phase component vector set to obtain a plurality of projection values. The terminal device may further determine a stronger one from the set of phase component vectors based on the plurality of projection values

A phase component vector. The stronger

The phase component vector can be understood as having a large weighting factor

A phase component vector.

In one possible design, each column vector in the set of phase component vectors may be taken from a DFT matrix or an oversampled DFT matrix. When the column vector in the phase component vector set is taken from the DFT matrix or the oversampled DFT matrix, the terminal device may determine the l-th beam vector according to the projection value of the phase vector according to the l-th beam vector on each column vector in the phase component vector set

The determination and determination by the terminal device from the set of amplitude component vectors has been detailed in step 2103 aboveThe first beam vector corresponds to

The specific process of each amplitude component vector and the weighting coefficient of each amplitude component vector. The specific process of the terminal device determining one or more phase component vectors corresponding to each beam vector and the weighting coefficients of the respective phase component vectors in step 2104 is similar to the process described above. A detailed description of the specific process thereof is omitted here for the sake of brevity.

In another possible design, each column vector in the set of phase component vectors includes N_sbThe phase angle.

In this case, the terminal device may determine an angle vector of the l-th beam vector from the phase vector of the l-th beam vector. Then, the terminal device may determine a projection value of the angle vector of the l-th beam vector to each column vector in the phase component vector set

If the set of phase component vectors includes N_sbThe terminal device may project an angle vector of the l-th beam vector to each column vector of the phase component vector set to obtain N_sbThe projection values. According to the N_sbThe size of the module length of the projection value is selected to be larger

The projection values. The mould being large

Any one of the projection values modulo. The modulus selected being larger

The projection values can be respectively

Weighting coefficients of the phase component vectors.

If the set of phase component vectors passes the oversampling factor O_pExpansion to O_p×N_sbA set of column vectors, which set of phase component vectors can be considered to comprise O_pSubsets each comprising N_sbA column vector. The terminal device may determine based on similar manners as described above

A plurality of phase component vectors and a weighting factor for each phase component vector. Since the terminal device has been based on O in the set of amplitude component vectors as described above_aSubset determination K_aThe detailed description of the specific process of each amplitude component vector and the weighting coefficient of each amplitude component vector is given, and the detailed description of the specific process is omitted here for the sake of brevity.

The second implementation mode,

K corresponding to each beam vector_pThe phase component vectors may be determined by means of linear fits, respectively. In this implementation, the phase vector corresponding to each beam vector may be indicated by one phase component vector. I.e. K corresponding to each beam vector_pIs 1, the weighting factor is also 1. In other words, one phase component vector may be regarded as one phase vector.

In some cases, the phase matrix G is generated within a 2 pi period_pThe trend of the angle of each phase vector in (a) may be linear respectively. For example, the phase matrix G_pAn vector of

Middle, each angle value

Can be formed with a tolerance of d₀Of equal difference series, phase matrix G_pAn vector of

Middle, each angle value

Can be formed with a tolerance of d₁The same number of differences, and so on, the phase matrix G_pAn vector of

Middle, each angle value

Can be formed with a tolerance of d_L-1The arithmetic progression of (1).

Wherein the phase matrix G_pMay be positive or negative, or may be 0. The corresponding tolerances of any two phase vectors may be different or the same. This is not a limitation of the present application.

In this case, the first indication information, when used to indicate the phase matrix, may be specifically used to indicate at least two of the first phase angle, the last phase angle, and the tolerance of each phase vector.

Further, this linearly changing trend can also be extended over multiple 2 π cycles. For example, the phase matrix G_pMay all vary from 0 to 2 pi. In fact, however, these angles may be approximately satisfied

Wherein,

representing a phase matrix G_pN in the l phase vector_sbAn angle of an element; theta_l,0Represents the angle of the 0 th element in the l-th phase vector; n is more than or equal to 0_sb≤N_sb-1，n_sbIs an integer; d_lTolerance of the l-th phase vector, d_lMay be positive, may be negative, or may be 0; m is selected such that

Falls within a value of [0,2 π]In the above range, m may be positive, negative or 0.

In this case, the first indication information, when used for indicating the phase matrix, may be specifically used for indicating: the first phase angle, tolerance of each phase vector, or the last phase angle, tolerance of each phase vector, or the first phase angle, last phase angle, and the number of cycles that the last phase angle is spaced from the first phase angle of each phase vector. The number of periods referred to herein is understood to be the number of 2 pi between the last phase angle and the first phase angle, i.e. m as defined above. The number of periods can be determined by the number of breakpoints of the phase angle connecting lines of the same phase vector. For example, if there are 2 break points in the phase angle connection of the same phase vector, it can be considered that the last phase angle is 2 pi apart from the first phase angle.

The plurality of phase angles may be indicated by an index of each phase angle. For example, a one-to-one correspondence relationship between a plurality of phase angles and a plurality of indices may be predefined in the codebook, and the terminal device may feed back the index corresponding to each phase angle or an index close to each phase angle to the network device based on the one-to-one correspondence relationship. Thus, each phase angle indicated by the terminal device may be the same as or close to the phase angle determined in step 2104.

It should be understood that the above description is made with 0 to 2 pi as one period only for easy understanding, and in fact, the present application is not limited to the start point and the end point of the period, and for example, it may be also described with-pi to pi as one period.

The linear trend of the angle of each phase vector in the phase matrix is only one possibility, and should not be limited in any way. In still other cases, the trend of the angle of the phase vector may be a fold line. The broken line can be divided into a plurality of multi-segment regions with different slopes, each segment region can have a linear variation trend, and the multi-segment region can be called a linear region. The first indication information, when used for indicating the phase vector, may be respectively indicated for each segment of the linear region based on the manner described above. For brevity, no further description is provided herein.

It should be understood that the linear trend referred to above may be an approximation. The angle of the phase vector tends to change along a polygonal line, and the number of linear areas divided by the polygonal line can be predefined, such as defined by a protocol, indicated by a network device, or defined and reported by a terminal device. This is not a limitation of the present application.

Based on the above-described method, the terminal device may determine one or more phase component vectors corresponding to each of the L beam vectors and a weighting coefficient of each phase component vector, respectively.

It is to be understood that the determinations enumerated above

The implementation of the phase component vectors and the weighting coefficients of the phase component vectors are merely examples, and should not limit the present application in any way. The application determines for a terminal device

The specific implementation of the phase component vectors and the weighting coefficients of the phase component vectors is not limited.

In step 2105, the terminal device generates first indication information.

The terminal device may generate the first indication information according to the L beam vectors determined in step 2101, the one or more amplitude component vectors and the weighting coefficients of the respective amplitude component vectors corresponding to each beam vector determined in step 2013, and the one or more phase component vectors and the weighting coefficients of the respective phase component vectors corresponding to each beam vector determined in step 2104.

Based on the L beam vectors determined in step 2101 above, the terminal device may determine information indicating the L beam vectors. The specific method for indicating the L beam vectors by the first indication information has already been described in detail in case one, and is not described herein again for brevity.

Based on the one or more magnitude component vectors corresponding to each beam vector determined in step 2103 above, the terminal device may determine information indicating the one or more magnitude component vectors of each beam vector. The first indication information may respectively indicate one or more amplitude component vectors corresponding to each beam vector.

The first indication information may include information indicating one or more magnitude component vectors corresponding to each of the L beam vectors. For example, for the L-th beam vector of the L beam vectors, the first indication information may include information indicating that the L-th beam vector corresponds to

Information of the individual amplitude component vectors. Such as

An index of a combination of individual magnitude component vectors in a set of magnitude component vectors, or

A subset to which the amplitude component vector belongs and the method

The index of the combination of amplitude component vectors in the subset.

The first indication information indicates that the ith beam vector corresponds to

The specific manner of the individual amplitude component vectors and the first indication information indication K described in the first case_aThe specific way of each amplitude component vector is the same, and for brevity, the description is omitted here.

Based on the weighting coefficients of the respective magnitude component vectors corresponding to each beam vector determined in step 2103 described above, the terminal device can determine information indicating the weighting coefficients of the respective magnitude component vectors corresponding to each beam vector. The first indication information may indicate weighting coefficients of the respective magnitude component vectors corresponding to each beam vector, respectively.

The first indication information may include information indicating a weighting coefficient of each amplitude component vector corresponding to each of the L beam vectors. For example, for the L-th beam vector of the L beam vectors, the first indication information may include information indicating that the L-th beam vector corresponds to

Information of the weighting coefficients of the individual amplitude component vectors. For example, the terminal equipment can indicate the state in a normalization mode

A weighting factor for each amplitude component vector.

Indicating K by way of normalization has been detailed in case one above_aThe specific process of weighting coefficients of the individual amplitude component vectors. The terminal equipment indicates in a normalization mode

The specific process of the weighting coefficients of the amplitude component vectors is similar, and for brevity, the detailed description is omitted here.

Based on the one or more phase component vectors corresponding to each beam vector determined in step 2104 above, the terminal device may determine information indicating the one or more phase component vectors of each beam vector. The first indication information may respectively indicate one or more phase component vectors corresponding to each beam vector.

As previously described, the terminal device may determine one or more phase component vectors corresponding to each beam vector through two different implementations. The method for indicating one or more phase component vectors corresponding to each beam vector by the first indication information is described below with reference to the two implementations respectively.

In one implementation, the first indication information may include information indicating one or more phase component vectors corresponding to each of the L beam vectors. For example, for the L-th beam vector of the L beam vectors, the first indication information may include information indicating that the L-th beam vector corresponds to

Information of the phase component vectors. Such as

An index of a combination of phase component vectors in a set of phase component vectors, or

Subset to which the phase component vector belongs and the method

The index of the combination of the phase component vectors in the subset.

The specific manner of the phase component vector and the first indication information indication K described in the first case_pThe specific manner of each phase component vector is the same, and for brevity, the description is omitted here.

Based on the weighting coefficients of the respective phase component vectors corresponding to each beam vector determined in step 2103 described above, the terminal device can determine information indicating the weighting coefficients of the respective phase component vectors corresponding to each beam vector. The first indication information may indicate weighting coefficients of the phase component vectors corresponding to each beam vector, respectively.

The first indication information may include information indicating a weighting coefficient of each phase component vector corresponding to each of the L beam vectors. For example, for the L-th beam vector of the L beam vectors, the first indication information may include information indicating that the L-th beam vector corresponds to

Information of the weighting coefficients of the phase component vectors. For example, the terminal equipment can indicate the state in a normalization mode

Weighting coefficients of the phase component vectors.

Indicating K by way of normalization has been detailed in case one above_pThe specific process of weighting coefficients of the phase component vectors. The terminal equipment indicates in a normalization mode

The specific process of the weighting coefficients of the phase component vectors is similar, and for brevity, the detailed description is omitted here.

In the second implementation manner, the terminal device determines the phase component vector corresponding to each beam vector by means of linear fitting. The first indication information, when used for indicating the phase component vector corresponding to each beam vector, may be specifically used for indicating a first phase angle, a last phase angle, and a number of cycles between the last phase angle and the first phase angle of each phase component vector; alternatively, it may be used to indicate the first phase angle and tolerance of each phase component vector, or the last phase angle and tolerance of each phase component vector.

Since the phase component vector of each beam vector can be regarded as one phase vector in this implementation, the weighting coefficient of each phase component vector can be considered to be 1. Therefore, when the terminal device indicates the correlation information of the phase angles listed above through the first indication information, the weighting coefficient of the phase component vector may be defaulted to 1. In other words, the first indication information may be considered to implicitly indicate that the weighting coefficient of each phase component vector is 1 when indicating the first phase angle, the last phase angle, and the number of cycles that the last phase angle is spaced apart from the first phase angle of each phase component vector, or when indicating the first phase angle and the tolerance of each phase component vector, or the last phase angle and the tolerance of each phase component vector.

In this implementation, the terminal device may indicate the phase vector of each beam vector separately, which is equivalent to not compressing the phase matrix.

Case three,

The amplitude component vectors corresponding to any two beam vectors are the same, but the phase component vectors corresponding to at least two beam vectors are different. In this case, the number of amplitude component vectors corresponding to any two beam vectors may be the same, and may be written as K, for example_a. The number of phase component vectors corresponding to each beam vector may be defined separately. For example, the number of phase component vectors corresponding to the l-th beam vector may be written as

Is a positive integer.

If K_aIs indicated by the network device, optionally, the method further includes: the network device sends second indication information indicating the number of the amplitude component vectors. Accordingly, the terminal device receives the second indication information. Optionally, the second indication information may be carried in higher layer signaling, such as an RRC message.

If K_aIs derived fromOptionally, the method further includes: and the terminal equipment sends second indication information, wherein the second indication information indicates the number of the amplitude component vectors. Accordingly, the network device receives the second indication information. Optionally, the second indication information may be carried in UCI, such as CSI.

It should also be understood that since the number of phase component vectors is indicated for each beam vector, the information indicating the number of phase component vectors of the L beam vectors may be one or more. The information of the number of amplitude component vectors and the information of the phase component vectors of the same beam vector may be indicated by the same information or may be indicated by different information. This is not a limitation of the present application.

In case three, the terminal device determines and K_aThe amplitude component vectors and the weighting coefficients of the amplitude component vectors. Terminal device determination K_aThe specific process of each amplitude component vector and the weighting coefficient of each amplitude component vector is the same as that of step 2103 in case one, and for brevity, the description thereof is omitted here.

In case three, the specific process of the terminal device determining the one or more phase component vectors corresponding to each beam vector and the weighting coefficients of each phase component vector is the same as the specific process of step 2104 in case two, and for brevity, no further description is given here.

In step 2105, the terminal device generates first indication information.

The terminal device may determine K from K determined in step 2103 based on the L beam vectors determined in step 2101_aThe amplitude component vectors and the weighting coefficients of the amplitude component vectors, and the one or more phase component vectors and the weighting coefficients of the phase component vectors corresponding to each beam vector determined in step 2104 generate first indication information.

The first indication information is used for indicating L beam vectors, K_aIndicating the L beam vectors, K as described in case step 2105, may be used when the amplitude component vectors and the weighting coefficients for each amplitude component vector are used_aThe respective amplitude component vectors and the weighting coefficients of the respective amplitude component vectors. For brevity, no further description is provided herein.

The first indication information may be indicated by indicating one or more phase component vectors corresponding to each beam vector and the weighting coefficients of the phase component vectors as described in the case of step 2105. For brevity, no further description is provided herein.

The fourth case,

The amplitude component vectors corresponding to at least two beam vectors are different, but the phase component vectors corresponding to any two beam vectors are the same. In this case, the number of phase component vectors corresponding to any two beam vectors may be the same, and may be written as K, for example_p. The number of amplitude component vectors corresponding to each beam vector may be defined separately. For example, the number of amplitude component vectors corresponding to the l-th beam vector may be written as

Is a positive integer.

It should also be understood that, since the number of amplitude component vectors is indicated for each beam vector, the information indicating the number of amplitude component vectors of the L beam vectors may be one or more. The information of the number of amplitude component vectors and the information of the phase component vectors of the same beam vector may be indicated by the same information or may be indicated by different information. This is not a limitation of the present application.

In the fourth case, the specific process of the terminal device determining the one or more amplitude component vectors corresponding to each beam vector and the weighting coefficients of each amplitude component vector is the same as the specific process of step 2103 in the second case, and for brevity, no further description is given here.

In case four, the terminal devicePreparation of determination of K_pA plurality of phase component vectors and a weighting factor for each phase component vector. Terminal device determination K_pThe specific process of each phase component vector and the weighting coefficient of each phase component vector is the same as the specific process of step 2104 in case one, and for brevity, the detailed description is omitted here.

In step 2105, the terminal device generates first indication information.

The terminal device may determine the weighting coefficients according to the L beam vectors determined in step 2101, the one or more amplitude component vectors corresponding to each beam vector determined in step 2103, and the respective amplitude component vectors, and K determined in step 2104_pThe phase component vectors and the weighting coefficients of the phase component vectors generate first indication information.

The first indication information is used for indicating L beam vectors, K_pIndicating the L beam vectors, K, as described in case step 2105 may be used when phase component vectors and weighting coefficients for each phase component vector are used_pThe phase component vectors and the weighting coefficients for each phase component vector. For brevity, no further description is provided herein.

The first indication information may be indicated in a manner of indicating one or more amplitude component vectors corresponding to each amplitude vector and the weighting coefficients of the amplitude component vectors as described in the case of step 2105 when the first indication information is used to indicate one or more amplitude component vectors corresponding to each beam vector and the weighting coefficients of the amplitude component vectors. For brevity, no further description is provided herein.

The specific process of the terminal device determining L beam vectors, the magnitude component vector of each beam vector and the weighting coefficient of each magnitude component vector, the phase component vector of each beam vector and the weighting coefficient of each phase component vector, and generating the first indication information are described above with reference to four different cases.

When the number of amplitude component vectors is 1 or the number of phase component vectors is 1, the weighting coefficient of the amplitude component vector may be 1 or the weighting coefficient of the phase component vector may be 1. That is, the magnitude component vector may be directly a magnitude vector, or the phase vector may be directly a phase vector.

It should be understood that the methods listed above are examples only and should not constitute any limitation to the present application. The specific manner of determining the L beam vectors, the amplitude component vector of each beam vector and the weighting coefficient of each amplitude component vector, and the phase component vector of each beam vector and the weighting coefficient of each phase component vector by the terminal device is not limited in the present application. In addition, the present application is not limited to a specific embodiment in which the terminal device instructs the L beam vectors, the amplitude component vector of each beam vector and the weighting coefficient of each amplitude component vector, and the phase component vector of each beam vector and the weighting coefficient of each phase component vector.

In step 230, the terminal device transmits the first indication information. Accordingly, the network device receives the first indication information.

Specifically, the first indication information may be a PMI, or may be a partial cell in the PMI, or may be other information. This is not a limitation of the present application. The first indication information may be carried in one or more messages in the prior art and sent to the network device by the terminal device, or may be carried in one or more messages newly designed in the present application and sent to the network device by the terminal device. The terminal device may send the first indication information to the network device through a physical uplink resource, for example, a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH), so that the network device recovers the precoding vector 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 a detailed description of a specific process of the terminal device is omitted here for brevity.

In step 240, the network device determines N according to the first indication information_sbA precoding vector for at least one of the sub-bands.

Network deviceBased on the first indication information, quantized values of the L beam vectors, one or more amplitude component vectors of each beam vector and weighting coefficients of the respective amplitude component vectors, and quantized values of one or more phase component vectors of each beam vector and weighting coefficients of the respective phase component vectors may be determined. Thereafter, the network device may further determine N_sbA precoding vector for at least one of the sub-bands. E.g. N_sbN-th of sub-band_sbPrecoding vectors for individual subbands. Wherein n is more than or equal to 0_sb≤N_sb-1, and n_sbAre integers.

That is, the network device may determine N based on the first indication information_sbA precoding vector for at least one of the sub-bands. Although the network device may determine the precoding vector of each subband according to the L beam vectors, the quantized values of the one or more amplitude component vectors of each beam vector and the weighting coefficients of the respective amplitude component vectors, and the quantized values of the one or more phase component vectors of each beam vector and the weighting coefficients of the respective phase component vectors, this does not represent that the network device determines the N_sbPrecoding vectors for individual subbands.

In one implementation, the network device may determine the magnitude vector for each beam vector based on one or more magnitude component vectors for each beam vector and quantized values of weighting coefficients for the respective magnitude component vectors. The network device may determine a phase vector for each beam vector based on one or more phase component vectors for each beam vector and quantized values of weighting coefficients for the respective phase component vectors.

Based on the magnitude vector and the phase vector of each beam vector, the network device may further determine that each beam vector is at N_sbWeighting coefficients on each subband. For example, the Hadamard product of the amplitude vector and the phase vector of the l-th beam vector is used as the l-th beam vector at N_sbWeighting coefficients on each subband.

Based on L beam vectors and the L beam vectors being in N_sbN-th of sub-band_sbWeighting factors on the sub-bands, which the network device can determine_sbPrecoding vectors for individual subbands.

In another implementation, the network device may determine, according to the quantized values of the L beam vectors, the one or more amplitude component vectors of each beam vector and the weighting coefficients of the respective amplitude component vectors, and the one or more phase component vectors of each beam vector and the weighting coefficients of the respective phase component vectors, indicated in the first indication information, the quantized values of the weighting coefficients of the respective phase component vectors, and the quantized values of the L beam vectors, the quantized values of the weighting coefficients of the respective phase component vectors, and the quantized values of the weighting coefficients of the respective phase component vectors_sbPrecoding vectors corresponding to the sub-bands:

wherein,

represents the L-th beam vector of the L beam vectors;

representing the corresponding of the ith beam vector

The k-th in the vector of amplitude components_aWeighting coefficients of the individual amplitude component vectors;

representing the corresponding of the ith beam vector

Kth in individual amplitude component vector_aA vector of amplitude components;

representing the corresponding of the ith beam vector

Kth in phase component vector_pA phase component vector;

representing the corresponding of the ith beam vector

Kth in phase component vector_pA phase component vector.

The matrix H in the equation may be similar to the space-frequency matrix described above, or, the space-frequency matrix recovered by the network device according to the first indication information. Since the space-frequency matrix may be N_sbThe precoding vectors corresponding to the subbands are constructed, and the network device may be configured according to the nth vector in the matrix H_sbColumn vector determination and nth_sbAnd precoding vectors corresponding to the sub-bands.

Specifically, in the n-th matrix H_sbFor example, a network device may assign a column vector to the nth_sbThe column vectors are normalized to determine the n-th column vector_sbAnd precoding vectors corresponding to the sub-bands. The normalization process may be, for example, to normalize the nth value_sbThe column vector is multiplied by a normalization coefficient so that the sum of the powers of the elements in the column vector equals 1. The normalized coefficient may be, for example, the inverse of the square root of the sum of the modulo lengths of the elements in this column. The application does not limit the specific value of the normalization coefficient and the specific mode of normalization processing. It should be noted that, in the embodiment of the present application, the lengths N of the amplitude vector and the phase vector_sbThe number of subbands included in a bandwidth occupied by a frequency domain of the CSI measurement resource configured for the terminal device, or a signaling length of a reporting band, or the number of subbands to be reported may be used, respectively. When the lengths of the amplitude vector and the phase vector are the number of subbands or the signaling length of a reporting band included in a frequency domain occupied bandwidth of the CSI measurement resource configured for the terminal device, the number of subbands to be reported may be less than or equal to N_sbIn (1). Therefore, the network device may determine the precoding vector of each sub-band according to the position of the sub-band to be reported, which is indicated by the reporting band or other signaling.

The length of the frequency domain vector is determined according to the number of sub-bands or the signaling length of the reporting band included in the frequency domain occupied bandwidth of the CSI measurement resource, the change rule of the channel on a plurality of continuous sub-bands can be embodied through the frequency domain vector, compared with the method of determining the length of the frequency domain vector according to the number of sub-bands to be reported, the frequency domain vector determined according to the number of sub-bands or the signaling length of the reporting band in the frequency domain occupied bandwidth of the CSI measurement resource can more accurately reflect the change rule of the channel in the frequency domain, and the precoding vector recovered based on feedback can be more adaptive to the channel.

It should be understood that the network devices listed above determine the nth indication information according to the first indication information_sbThe specific method of the precoding vectors corresponding to the subbands is only an example, and should not constitute any limitation to the present application. The present application does not exclude that the network device determines the nth indication information in other manners according to the first indication information_sbThe probability of the corresponding precoding vector for the subband.

The method for indicating and determining the precoding vector in the case of 1 transmission layer and 1 polarization direction number is described in detail above with reference to fig. 2 and 3. It should be understood that the method is not only applicable to the case where the number of transmission layers is 1 or the number of polarization directions is 1, but also applicable to the case where a plurality of transmission layers or a plurality of polarization directions are used.

Specifically, when the number of transmission layers is 1 and the number of polarization directions is greater than 1, for example, when the number of polarization directions is 2, the two polarization directions may share the same L beam vectors, or different L beam vectors may be used. The two polarization directions may share the same magnitude component vector or different magnitude component vectors may be used. The two polarization directions may share the same phase component vector or different phase component vectors may be used.

When the number of polarization directions is 2, the terminal device may send one piece of first indication information for each polarization direction, and each piece of first indication information may correspond to one polarization direction.

If two polarization directions share the same L beam vectors, the terminal device may indicate the L beam vectors only once, so as to avoid unnecessary overhead caused by repeated indication. The indications of the L beam vectors may be common in the two first indication information corresponding to the two polarization directions.

The specific manner in which the terminal device determines the L beam vectors may be similar to that described above.

In one implementation, the terminal device may project the ideal precoding vector of each subband in a certain polarization direction onto each column vector in the beam vector set, respectively, to obtain a plurality of projection values. And L beam vectors may be determined based on the plurality of projection values. The specific method for determining L beam vectors by the terminal device according to the plurality of projection values has been described in detail in step 2101 above, and for brevity, details are not described here again.

Wherein the determination of the L beam vectors based on which polarization direction the ideal precoding vector is in may be predefined, as defined by the protocol. This is not a limitation of the present application.

In another implementation manner, the ideal precoding vectors of each subband in two polarization directions of the terminal device are respectively projected onto each column vector in the beam vector set, so as to respectively obtain two sets of projection values corresponding to the two polarization directions, where each set of projection values includes a plurality of projection values. As previously mentioned, each set of projection values may be represented by B_s ^HDimension obtained by H calculation is N_tx×N_sbIs used to determine the elements in the matrix. Therefore, the two sets of projection values can respectively correspond to two dimensions N_tx×N_sbOf the matrix of (a). For convenience of explanation, the first projection matrix and the second projection matrix are respectively referred to. The terminal equipment can enable i to be between 0 and N_sbAnd 1, determining the sum of the mode lengths of the ith column in the first projection matrix and the ith column in the second projection matrix, and taking L columns in the beam vector set corresponding to L columns with larger mode length sum as L beam vectors. For example, the sequence number of the L columns in the beam vector set used for generating the sum of the modulo lengths may be the sequence number of the column in the beam vector set in which the L beam vectors are located. The projection values of the L rows in the first projection matrix can be used as weighting coefficients of the L beam vectors in the first polarization direction, and the projection values of the L rows in the second projection matrix can be used as weighting coefficients of the L beam vectors in the second polarization directionAnd (4) counting.

If two polarization directions use different L beam vectors, the terminal device may respectively indicate the L beam vectors corresponding to each polarization direction. Then of the two first indication information corresponding to the two polarization directions, each first indication information comprises an indication of the L beam vectors in the corresponding polarization direction.

The terminal device may respectively project the ideal precoding vector of each subband in each polarization direction onto each vector in the beam vector set, so as to obtain a plurality of projection values. And L beam vectors corresponding to each polarization direction may be determined from the plurality of projection values. The specific method for determining L beam vectors by the terminal device according to the plurality of projection values has been described in detail in step 2101 above, and for brevity, details are not described here again.

It should be noted that, regardless of whether two polarization directions share the same L beam vectors, the weighting coefficients of the beam vectors in each polarization direction may be determined according to the ideal precoding vectors in each polarization direction. Based on the weighting coefficients of the beam vectors in different polarization directions, the terminal device may further determine one or more amplitude component vectors and the weighting coefficients of the amplitude component vectors of each beam vector in each polarization direction, one or more phase component vectors of each beam vector and the weighting coefficients of the phase component vectors.

If L wave beam vectors in the same polarization direction share the same K_aThe L wave beam vectors in different polarization directions can share the same K_aA vector of amplitude components. Then, of the two first indications corresponding to the two polarization directions, K is_aThe indication of the individual magnitude component vectors may be common.

Terminal device determination K_aThe specific manner of individual magnitude component vectors may be similar to that described above. For example, an amplitude matrix may be determined according to a weighting coefficient in a certain polarization direction, and K may be determined by projecting each column vector in an amplitude component vector set_aA vector of amplitude components. Also for example, it may be based on two polesWeighting coefficients in the quantization direction respectively determine an amplitude matrix, and then respectively project each column vector in the amplitude component vector set to determine K_aA vector of amplitude components. The above two modes have been described in detail, and are not described herein again for brevity.

If the L beam vectors in each of the two polarization directions respectively use one or more amplitude component vectors corresponding to each of the two polarization directions, the one or more amplitude component vectors corresponding to any two beam vectors may be different. In two first indication information corresponding to the two polarization directions, each first indication information includes an indication of one or more magnitude component vectors of each of the L beam vectors in the corresponding polarization direction.

As can be seen from the above description, the terminal device may determine the corresponding one or more amplitude component vectors according to the amplitude vector corresponding to each beam vector, and the specific manner of the determination is described in detail above, and for brevity, no further description is given here.

In the process of determining one or more amplitude component vectors corresponding to each beam vector, the terminal device may simultaneously determine the weighting coefficients of the amplitude component vectors. It is to be understood that since the ideal precoding vectors of the subbands in the two polarization directions may be different, the amplitude matrices in the two polarization directions may also be different, and the amplitude component vectors in the two polarization directions may also be different, the weighting coefficients of the amplitude component vectors in the two polarization directions may also be different. Thus, the same K is shared for both polarization directions whether or not_aThe weighting coefficients of the amplitude component vectors in each polarization direction can be determined according to the amplitude matrix in each polarization direction. Therefore, of the two pieces of first indication information corresponding to the two polarization directions, each piece of first indication information may include a weighting coefficient of each magnitude component vector in the corresponding polarization direction.

If L wave beam vectors in the same polarization direction share the same K_pWith the phase component vector, the L beam vectors in different polarization directions can be sharedWith the same K_pA phase component vector. Then, of the two first indications corresponding to the two polarization directions, K is_pThe indication of the phase component vector may be common.

The terminal equipment determines K through projection in the phase component vector set_pA phase component vector. For example, a phase matrix may be determined based on a weighting factor in a certain polarization direction, and K may be determined by projecting each column vector in a set of phase component vectors_pA phase component vector. For another example, the phase matrix may be determined according to the weighting coefficients in the two polarization directions, and then projected on each column vector in the phase component vector set to determine K_pA phase component vector. The above two modes have been described in detail, and are not described herein again for brevity.

If the L beam vectors in each of the two polarization directions use one or more phase component vectors corresponding to each of the two polarization directions, the phase component vectors corresponding to any two beam vectors may be different. In two first indication information corresponding to the two polarization directions, each first indication information includes an indication of one or more phase component vectors of each of the L beam vectors in the corresponding polarization direction.

As can be seen from the above description, the terminal device may determine the corresponding one or more phase component vectors according to the phase vector corresponding to each beam vector through any one of the first implementation manner and the second implementation manner, and the specific manner of the determination has been described in detail above, and is not described herein again for brevity.

The terminal device may determine the weighting coefficients of the phase component vectors simultaneously in the process of determining one or more phase component vectors corresponding to each beam vector. It is to be understood that since the ideal precoding vectors of the subbands in the two polarization directions may be different, the phase matrices in the two polarization directions may also be different, and the phase component vectors in the two polarization directions may also be different, the addition of the phase component vectors in the two polarization directions may be differentThe weight coefficients may also be different. Thus, the same K is shared for both polarization directions whether or not_pThe phase component vectors, the weighting coefficients of the phase component vectors in each polarization direction can be determined according to the phase matrix in each polarization direction. Therefore, of the two pieces of first indication information corresponding to the two polarization directions, each piece of first indication information may include a weighting coefficient of each phase component vector in the corresponding polarization direction.

The network device may determine precoding vectors of subbands in different polarization directions based on the received two first indication information. The specific process of the network device determining the precoding vector of each sub-band in the corresponding polarization direction based on the first indication information corresponding to each polarization direction may be the same as the specific process described in step 240 above, and for brevity, no further description is given here.

It should be noted that after determining the precoding vector of each sub-band in each polarization direction, the network device may splice the two polarization directions together to obtain the precoding vector corresponding to each sub-band. For example, if the number of polarization directions is 1, assume that the nth polarization direction is the first polarization direction_sbThe precoding vector of a sub-band is denoted as h₁N in the second polarization direction_sbThe precoding vector of a sub-band is denoted as h₂. Then the sum is n_sbThe precoding vector corresponding to each sub-band may be

Wherein α is normalized coefficient, α > 0.

The specific case that the first indication information is used to indicate and determine the precoding vector when the number of transmission layers is 1 and the number of polarization directions is greater than 1 is described in detail above. When the number of transmission layers is greater than 1 and the number of polarization directions is greater than 1, for example, when the number of transmission layers is R (R > 1, and R is an integer) and the number of polarization directions is 2, the terminal device may indicate a precoding vector in each polarization direction of each transmission layer through 2R pieces of first indication information.

Alternatively, two polarization directions may share the same L beam vectors, and any two transmission layers may also share the same L beam vectors. Of the 2R pieces of first indication information, the indications of the L beam vectors may be common.

Alternatively, the two polarization directions may share the same L beam vectors, but each transmission layer uses a respective L beam vector. Of the 2R pieces of first indication information, the L pieces of beam vector may be indicated in common in two pieces of first indication information corresponding to each transmission layer.

Alternatively, each polarization direction may use a respective L beam vectors, and each transmission layer may use a respective 2L beam vectors. Of the 2R pieces of first indication information, each piece of first indication information may include an indication of L beam vectors in one polarization direction of one transmission layer.

Similarly, optionally, two polarization directions may share the same one or more amplitude component vectors, and any two transmission layers may also share the same one or more amplitude component vectors. Of the 2R pieces of first indication information, the indication of the one or more amplitude component vectors may be common.

Alternatively, both polarization directions may share the same one or more amplitude component vectors, but each transmission layer may use a respective one or more amplitude component vectors. The number of the amplitude component vectors on any two transmission layers may be the same or different, and this is not limited in this application. Of the 2R pieces of first indication information, the indication of one or more amplitude component vectors may be common to two pieces of first indication information corresponding to each transmission layer.

Alternatively, each polarization direction may use a respective one or more amplitude component vectors, and each transmission layer may use a respective one or more amplitude component vectors. The number of amplitude component vectors on any two transmission layers may be the same or different. The number of the amplitude component vectors in any two polarization directions may be the same or different. This is not a limitation of the present application. Of the 2R pieces of first indication information, each piece of first indication information may include an indication of one or more magnitude component vectors in one polarization direction, one transmission layer.

In addition, each of the 2R pieces of first indication information may include a transmission layer, and a weighting coefficient of each magnitude component vector in one polarization direction.

Similarly, optionally, two polarization directions may share the same phase component vector or vectors, and any two transmission layers may also share the same phase component vector or vectors. Of the 2R pieces of first indication information, the indication of the one or more phase component vectors may be common.

Alternatively, both polarization directions may share the same phase component vector or vectors, but each transmission layer may use a respective phase component vector or vectors. The number of phase component vectors on any two transmission layers may be the same or different, and this is not limited in this application. Of the 2R pieces of first indication information, the indication of one or more phase component vectors may be common to two pieces of first indication information corresponding to each transmission layer.

Alternatively, each polarization direction may use a respective one or more phase component vectors, and each transmission layer may use a respective one or more phase component vectors. The number of phase component vectors on any two transport layers may be the same or different. The number of phase component vectors in any two polarization directions may be the same or different. This is not a limitation of the present application. Of the 2R pieces of first indication information, each piece of first indication information may include an indication of one or more phase component vectors in one polarization direction, one transmission layer.

In addition, each of the 2R pieces of first indication information may include a transmission layer, and a weighting coefficient of each phase component vector in one polarization direction.

The network device may determine the precoding matrix of each sub-band by first determining the precoding vector of each sub-band in different polarization directions and then determining the precoding vector of each sub-band on different transmission layers based on the received 2R pieces of first indication information. The specific process of the network device determining the precoding vector of each sub-band in the corresponding polarization direction based on the first indication information corresponding to each transmission layer and each polarization direction may be the same as the specific process described in step 240 above, and for brevity, no further description is given here.

It should be noted that after determining the precoding vectors of each sub-band in each transmission layer and each polarization direction, the network device may splice the same transmission layer and two polarization directions together to obtain the precoding vectors corresponding to each sub-band. Then, precoding vectors of the same sub-band of different transmission layers can be spliced together to obtain precoding matrixes corresponding to the respective sub-bands.

For example, when the number of transmission layers is 2 and the number of polarization directions is 2, assume that the nth polarization direction on the first transmission layer is_sbThe precoding vector of a sub-band is denoted as h_1,1N in the second polarization direction_sbThe precoding vector of a sub-band is denoted as h_1,2(ii) a N-th in the first polarization direction on the second transmission layer_sbThe precoding vector of a sub-band is denoted as h_2,1N in the second polarization direction_sbThe precoding vector of a sub-band is denoted as h_2,2. Then the sum is n_sbThe precoding vector corresponding to each sub-band may be

Wherein η is normalized coefficient, η > 0.

Since the amplitude coefficient and the phase coefficient of each beam vector in a plurality of sub-bands can be represented by the amplitude vector and the phase vector, respectively, the feedback overhead does not change due to the change of the number of sub-bands. In other words, this feedback mode can be understood as a mode of subband joint feedback. In this feedback mode, the terminal device does not need to perform separate feedback on the amplitude coefficient and the phase coefficient of each sub-band. And the amplitude vector and the phase vector of each beam vector are approximately represented by the weighted summation of one or more amplitude component vectors and the weighted summation of one or more phase component vectors, so that the feedback overhead of the amplitude coefficient and the phase coefficient can be compressed, and the feedback overhead is greatly reduced on the basis of ensuring the approximate accuracy.

The method for indicating the precoding vector according to the embodiment of the present application is described in detail above with reference to fig. 2 and fig. 3. Hereinafter, the communication device according to the embodiment of the present application will be described in detail with reference to fig. 4 to 6.

Fig. 4 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown, the communication device 1000 may include a communication unit 1100 and a processing unit 1200.

In one possible design, the communication apparatus 1000 may correspond to the terminal device in the above method embodiment, and may be, for example, the terminal device or a chip configured in the terminal device.

Specifically, the communication apparatus 1000 may correspond to the terminal device in the method 200 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the method executed by the terminal device in the method 200 in fig. 2. Also, the units in the communication device 1000 and the other operations and/or functions described above are respectively for implementing the corresponding flows of the method 200 in fig. 2.

Wherein, when the communication device 1000 is used to execute the method 200 in fig. 2, the communication unit 1100 may be used to execute the steps 220 and 230 in the method 200, and the processing unit 1200 may be used to execute the step 210 (including the steps 2101 to 2105) in the method 200.

It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

It is further understood that when the communication apparatus 1000 is a terminal device, the communication unit 1100 in the communication apparatus 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in fig. 5, and the processing unit 1200 in the communication apparatus 1000 may correspond to the processor 2010 in the terminal device 2000 shown in fig. 5.

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

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

Specifically, the communication apparatus 1000 may correspond to the network device in the method 200 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the method executed by the network device in the method 200 in fig. 2. Also, the units in the communication device 1000 and the other operations and/or functions described above are respectively for implementing the corresponding flows of the method 200 in fig. 2.

Wherein, when the communication device 1000 is used to execute the method 300 in fig. 3, the communication unit 1100 may be used to execute the steps 220 and 230 in the method 200, and the processing unit 1200 may be used to execute the step 240 in the method 200.

It should also be understood that when the communication apparatus 1000 is a network device, the communication unit in the communication apparatus 1000 may correspond to the transceiver 3200 in the network device 3000 shown in fig. 6, and the processing unit 1200 in the communication apparatus 1000 may correspond to the processor 3100 in the network device 3000 shown in fig. 6.

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. 5 is a schematic structural diagram of a terminal device 2000 according to an embodiment of the present application. The terminal device 2000 can be applied to the system shown in fig. 1, and performs the functions of the terminal device in the above method embodiment.

As shown, the terminal device 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further comprises a memory 2030. The processor 2010, the transceiver 2002 and the memory 2030 may be in communication with each other via the interconnection path to transfer control and/or data signals, the memory 2030 may be used for storing a computer program, and the processor 2010 may be used for retrieving and executing the computer program from the memory 2030 to control the transceiver 2020 to transmit and receive signals. Optionally, the terminal device 2000 may further include an antenna 2040, configured to transmit uplink data or uplink control signaling output by the transceiver 2020 by using a wireless signal.

The processor 2010 and the memory 2030 may be combined into a processing device, and the processor 2010 is configured to execute the program codes stored in the memory 2030 to achieve the above functions. In particular, the memory 2030 may be integrated with the processor 2010 or may be separate from the processor 2010. The processor 2010 may correspond to the processing unit in fig. 4.

The transceiver 2020 may correspond to the communication unit in fig. 4, 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). Wherein the receiver is used for receiving signals, and the transmitter is used for transmitting signals.

It should be understood that terminal device 2000 shown in fig. 5 is capable of implementing various processes involving the terminal device in the method embodiment shown in fig. 2. The operations and/or functions of the modules in the terminal device 2000 are respectively to implement the corresponding flows in the above-described method embodiments. Reference may be made specifically to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.

The processor 2010 may be configured to perform the actions described in the preceding method embodiments that are implemented within the terminal device, and the transceiver 2020 may be configured to perform the actions described in the preceding method embodiments that the terminal device transmits to or receives from the network device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

Optionally, the terminal device 2000 may further include a power supply 2050 for supplying power to various devices or circuits in the terminal device.

In addition, in order to further improve the functions of the terminal device, 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, and the like, and the audio circuit may further include a speaker 2082, a microphone 2084, and the like.

Fig. 6 is a schematic structural diagram of a network device provided in the embodiment of the present application, which may be a schematic structural diagram of a base station, for example. The base station 3000 can be applied to the system shown in fig. 1, and performs the functions of the network device in the above method embodiment.

As shown, 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 (BBUs) (which may also be referred to as Distributed Units (DUs)) 3200. The RRU3100 may be referred to as a transceiver unit and corresponds to the communication unit 1200 in fig. 4. Alternatively, the transceiving unit 3100 may also be referred to as a transceiver, transceiving circuit, or transceiver, etc., which may comprise at least one antenna 3101 and a radio frequency unit 3102. Alternatively, 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 RRU3100 part is mainly used for transceiving and converting radio frequency signals to baseband signals, for example, for sending indication information to a terminal device. The BBU 3200 section is mainly used for performing baseband processing, controlling a base station, and the like. The RRU3100 and the BBU 3200 may be physically disposed together or may be physically disposed separately, i.e. distributed base stations.

The BBU 3200, which is a control center of the base station and may also be referred to as a processing unit, may correspond to the processing unit 1100 in fig. 4, and is mainly used for performing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing unit) may be configured to control the base station to perform an operation procedure related to the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU 3200 may be formed by one or more boards, and the boards may collectively support a radio access network of a single access system (e.g., an LTE network), or may respectively support radio access networks of different access systems (e.g., an LTE network, a 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 for controlling the base station to perform necessary actions, for example, for controlling the base station to execute the operation flow related to the network device in the above method embodiment. The memory 3201 and processor 3202 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be appreciated that base station 3000 shown in fig. 6 is capable of implementing various processes involving network devices in the method embodiment of fig. 2. The operations and/or functions of the respective modules in the base station 3000 are respectively for implementing the corresponding flows in the above-described method embodiments. Reference may be made specifically to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.

BBU 3200 as described above can be used to perform actions described in previous method embodiments as being implemented internally by a network device, while RRU3100 can be used to perform actions described in previous method embodiments as being sent by or received from a terminal device by a network device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform the method of communication in any of the above method embodiments.

It should be understood that the processing means may be a chip. For example, the processing device may be a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit (DSP), a Microcontroller (MCU), a programmable logic controller (PLD), or other integrated chips.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor described above 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 device, discrete gate or transistor logic, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A 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 connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

According to the method provided by the embodiment of the present application, the present application further provides a computer program product, which includes: computer program code which, when run on a computer, causes the computer to perform the method of any of the embodiments shown in fig. 2.

According to the method provided by the embodiment of the present application, the present application also provides a computer readable medium, which stores program code, and when the program code runs on a computer, the computer is caused to execute the method of any one of the embodiments shown in fig. 2.

According to the method provided by the embodiment 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, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

The network device in the foregoing device embodiments completely corresponds to the terminal device and the network device or the terminal device in the method embodiments, and the corresponding module or unit executes the corresponding steps, for example, the communication unit (transceiver) executes the steps of receiving or transmitting in the method embodiments, and other steps besides transmitting and receiving may be executed by the processing unit (processor). The functions of the specific elements may be referred to in the respective method embodiments. The number of the processors may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within 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 components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps (step) described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

In the above embodiments, the functions of the functional units may be fully or partially implemented by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). The procedures or functions described in accordance with the embodiments of the present application are generated in whole or in part when the computer program instructions (programs) are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of indicating a precoding vector, comprising:

generating first indication information, wherein the first indication information is used for indicating L beam vectors and one or more amplitude component vectors, weighting coefficients of the amplitude component vectors, one or more phase component vectors and weighting coefficients of the phase component vectors corresponding to each beam vector; one or more amplitude component vectors corresponding to the l-th beam vector and weighting coefficients of the amplitude component vectors are used for constructing the amplitude vector of the l-th beam vector, one or more phase component vectors corresponding to the l-th beam vector and weighting coefficients of the phase component vectors are used for constructing the phase vector of the l-th beam vector, the amplitude vector of the l-th beam vector and the phase vector of the l-th beam vector are used for determining the weighting coefficient vector of the l-th beam vector, and the n-th weighting coefficient vector in the weighting coefficient vectors_sbElement is the l-th beam vector at N_sbN-th in individual sub-bands_sbWeighting coefficients on the individual sub-bands; the L beam vectors and the L beam vectors are at the nth_sbWeighting coefficients on subbands are used to construct the nth_sbA precoding vector corresponding to a subband; wherein the L-th beam vector is any one of the L beam vectors, and n is greater than or equal to 0_sb≤N_sb-1，n_sbAnd L is an integer, L and N_sbIs a positive integer;

and sending the first indication information.

2. A method of determining a precoding vector, comprising:

receiving first indication information, wherein the first indication information is used for indicating L beam vectors and one or more amplitude component vectors, weighting coefficients of the amplitude component vectors, one or more phase component vectors and weighting coefficients of the phase component vectors corresponding to each beam vector; one or more amplitude component vectors corresponding to the ith beam vector and weighting coefficients of the amplitude component vectors are used for constructing the amplitude vector of the ith beam vector corresponding to the ith beam vectorThe one or more phase component vectors and the weighting coefficients of each phase component vector are used to construct a phase vector of the l-th beam vector, the magnitude vector of the l-th beam vector and the phase vector of the l-th beam vector are used to determine a weighting coefficient vector of the l-th beam vector, the n-th of the weighting coefficient vectors_sbElement is the l-th beam vector at N_sbN-th in individual sub-bands_sbWeighting coefficients on the individual sub-bands; the L beam vectors and the L beam vectors are at the nth_sbWeighting coefficients on subbands are used to construct the nth_sbA precoding vector corresponding to a subband; wherein the L-th beam vector is any one of the L beam vectors, and n is greater than or equal to 0_sb≤N_sb-1，n_sbAnd L is an integer, L and N_sbIs a positive integer;

determining the N according to the first indication information_sbA precoding vector for at least one of the sub-bands.

3. The method of claim 1 or 2, wherein the number of amplitude component vectors corresponding to any two of the L beam vectors is the same, and the number of phase component vectors corresponding to any two beam vectors is the same.

4. The method of claim 3, wherein a first beam vector of the L beam vectors corresponds to a same magnitude component vector as a second beam vector, the first beam vector and the second beam vector being any two of the L beam vectors.

5. A method according to any one of claims 1 to 4, wherein each phase component vector is determined by a set of phase angles, each set of phase angles being used to determine a phase component vector, each set of phase angles comprising a plurality of phase angles, and the phase angles in each set of phase angles forming an arithmetic series, the arithmetic series formed by any two sets of phase angles being of different tolerances; and

the first indication information, when used for indicating the one or more phase component vectors, is specifically used for indicating at least two of a first phase angle, a last phase angle and a tolerance of each group of one or more groups of phase angles.

6. The method of any of claims 1-5, wherein the length N of the vector of magnitude components_sbComprises the following steps:

the number of sub-bands contained in a frequency domain occupied bandwidth of a Channel State Information (CSI) measurement resource configured for a terminal device; or

The length of the signaling for indicating the position and the number of the sub-bands to be reported; or

The number of sub-bands to be reported.

7. A communications apparatus, comprising:

a processing unit, configured to generate first indication information, where the first indication information is used to indicate the L beam vectors and one or more amplitude component vectors, weighting coefficients of the amplitude component vectors, one or more phase component vectors, and weighting coefficients of the phase component vectors corresponding to each beam vector; one or more amplitude component vectors and weighting coefficients of each amplitude component vector corresponding to an l-th beam vector are used for constructing the amplitude vector of the l-th beam vector, one or more phase component vectors and weighting coefficients of each phase component vector corresponding to the l-th beam vector are used for constructing the phase vector of the l-th beam vector, and the amplitude vector of the l-th beam vector and the phase vector of the l-th beam vector are used for determining N of the l-th beam vector_sbA vector of weighting coefficients, said N_sbN-th of weighting coefficient vector_sbElement is the l-th beam vector at N_sbN-th in individual sub-bands_sbWeighting coefficients on the individual sub-bands; the L beam vectors and the L beam vectors are at the nth_sbWeighting coefficients on subbands are used to construct the nth_sbA precoding vector corresponding to a subband;wherein the L-th beam vector is any one of the L beam vectors, and n is greater than or equal to 0_sb≤N_sb-1，n_sbAnd L is an integer, L and N_sbIs a positive integer;

a communication unit, configured to send the first indication information.

8. A communications apparatus, comprising:

a communication unit, configured to receive first indication information, where the first indication information is used to indicate L beam vectors and one or more amplitude component vectors, weighting coefficients of the amplitude component vectors, one or more phase component vectors, and weighting coefficients of the phase component vectors corresponding to each beam vector; one or more amplitude component vectors and weighting coefficients of each amplitude component vector corresponding to an l-th beam vector are used for constructing an amplitude vector of the l-th beam vector, one or more phase component vectors and weighting coefficients of each phase component vector corresponding to the l-th beam vector are used for constructing a phase vector of the l-th beam vector, the amplitude vector of the l-th beam vector and the phase vector of the l-th beam vector are used for determining N weighting coefficient vectors of the l-th beam vector, and an nth weighting coefficient vector of the N weighting coefficient vectors_sbElement is the l-th beam vector at N_sbN-th in individual sub-bands_sbWeighting coefficients on the individual sub-bands; the L beam vectors and the L beam vectors are at the nth_sbWeighting coefficients on subbands are used to construct the nth_sbA precoding vector corresponding to a subband; the L beam vectors and the L beam vectors are at the nth_sbWeighting coefficients on subbands are used to construct the nth_sbA precoding vector corresponding to a subband; wherein the L-th beam vector is any one of the L beam vectors, and n is greater than or equal to 0_sb≤N_sb-1，n_sbAnd L is an integer, L and N_sbIs a positive integer;

a processing unit for determining the N according to the first indication information_sbPrecoding vector for at least one of the sub-bands。

9. The apparatus of claim 7 or 8, wherein the number of amplitude component vectors corresponding to any two of the L beam vectors is the same, and the number of phase component vectors corresponding to any two beam vectors is the same.

10. The apparatus of claim 9, wherein a first beam vector of the L beam vectors corresponds to a same magnitude component vector as a second beam vector, the first beam vector and the second beam vector being any two of the L beam vectors.

11. An apparatus according to any one of claims 7 to 10, wherein each phase component vector is determined by a set of phase angles, each set of phase angles being used to determine a phase component vector, each set of phase angles comprising a plurality of phase angles, and the phase angles in each set of phase angles forming an arithmetic series, the arithmetic series formed by any two sets of phase angles being of different tolerances; and

12. The apparatus of any of claims 7-11, wherein the length N of the vector of magnitude components_sbComprises the following steps:

The number of sub-bands to be reported.

13. A communications apparatus comprising at least one processor configured to perform the method of any of claims 1-6.

14. A computer-readable medium, comprising a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 6.