WO2024093945A1

WO2024093945A1 - Channel parameter reporting method and communication apparatus

Info

Publication number: WO2024093945A1
Application number: PCT/CN2023/127932
Authority: WO
Inventors: 高君慧; 叶宸成; 金黄平
Original assignee: 华为技术有限公司
Priority date: 2022-11-04
Filing date: 2023-10-30
Publication date: 2024-05-10
Also published as: CN117997399A

Abstract

Provided in the present application are a channel parameter reporting method and a communication apparatus, which can reduce the feedback overhead of space-frequency-time weighting coefficients corresponding to codebooks, and can be used in 5G systems. The method comprises: a terminal device using a first bitmap to respectively indicate results of primary selection of S first weighting coefficients in two dimensions, i.e. the spatial time domain and the spatial frequency domain, and using a second bitmap to indicate X first weighting coefficients obtained by secondary selection of the primary selection of said first weighting coefficients in combination with a basis of a third dimension. Indicating by the bitmaps in two levels the X first weighting coefficients selected from amongst the S first weighting coefficients, the method can reduce the feedback overhead, S and X being positive integers, and X≤S.

Description

A channel parameter reporting method and communication device

This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office on November 4, 2022, with application number 202211376129.3 and application name “A channel parameter reporting method and communication device”, all contents of which are incorporated by reference in this application.

Technical Field

The embodiments of the present application relate to the field of communications, and in particular to a channel parameter reporting method and a communication device.

Background technique

In the ^fifth generation (5G) communication system, when using massive multiple input multiple output (Massive-MIMO) technology, the network device can send a reference signal to the terminal device, and the terminal device performs channel measurement through the received reference signal and feeds back the measured channel state information (CSI) to the network device. Among them, CSI may include rank indicator (RI), precoding matrix indicator (PMI) and channel quality indicator (CQI).

At present, in the mobility enhancement codebook proposed by the 3rd generation partnership project (3GPP) in release 18 (Rel-18), the CSI codebook is represented by a three-dimensional matrix of spatial domain, frequency domain and Doppler domain. For example, the codebook structure can be expressed as Wherein, _W1 represents the spatial domain matrix formed by the selected spatial domain basis, _Wf represents the frequency domain matrix formed by the selected frequency domain basis, and _Wd represents the Doppler domain matrix formed by the selected Doppler domain basis. Represents the space-frequency time weighting coefficient matrix.

However, since the mobility enhancement codebook additionally introduces the Doppler domain dimension, when the selected spatial domain basis is L (L is a positive integer), the selected frequency domain basis is M (M is a positive integer), and the selected Doppler domain basis is Q (Q is a positive integer), the corresponding space-frequency-time weighting coefficient is LMQ, that is, the number of elements in the above-mentioned space-frequency-time weighting coefficient matrix is LMQ. Then, when the terminal device selects some weighting coefficients from the LMQ space-frequency-time weighting coefficients and feeds back in the form of a bitmap, such as indicating whether the weighting coefficient is selected by 0 or 1, the feedback overhead of the bitmap is LMQ bits. Therefore, how to reduce the feedback overhead of the space-frequency-time weighting coefficient corresponding to the codebook has become an urgent problem to be solved.

Summary of the invention

The embodiments of the present application provide a channel parameter reporting method and a communication device, which can reduce the feedback overhead of the space-frequency time weighting coefficient corresponding to the codebook.

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

In a first aspect, a channel parameter reporting method is provided, which can be executed by a terminal device, or by a component of the terminal device, such as a processor, chip, or chip system of the terminal device, or by a logic module or software that can realize all or part of the functions of the terminal device. The following is an explanation of the method being executed by a terminal device as an example. The channel parameter feedback method includes: the terminal device determines the first information. Among them, the first information is used to indicate the X first weighting coefficients selected by the terminal device from the S first weighting coefficients in the first codebook, the first codebook includes L selected spatial basis, M frequency domain basis, Q Doppler domain basis and S first weighting coefficients, the first information includes a first bit map and a second bit map, the first bit map is used to indicate K first basis pairs selected from L×A first basis pairs, the L×A first basis pairs correspond to the L spatial basis and the A first basis, and the L×A first basis pairs Each first basis pair and B second basis in corresponds to B first weighting coefficients, the first basis is a frequency domain basis or a Doppler domain basis, the second basis is a frequency domain basis or a Doppler domain basis, the first basis is different from the second basis, the second bitmap is used to indicate X first weighting coefficients selected from K×B first weighting coefficients, K×B first weighting coefficients correspond to K first basis pairs and B second basis, S, X, L, M, Q, A, K, B are positive integers, S=L×M×Q, 1≤X≤K×B≤S. The terminal device sends channel state information CSI to the network device. Among them, CSI includes first information.

Based on the channel parameter feedback method, the terminal device uses the first bitmap to indicate the result of selecting S first weighting coefficients from the two dimensions of the space-time domain or the space-frequency domain, and uses the second bitmap to indicate the X first weighting coefficients obtained by performing a second selection on the first weighting coefficients after the first selection combined with the basis of the third dimension. The formula is used to indicate the X first weighting coefficients selected from the S first weighting coefficients, which can reduce the bitmap overhead. For example, L=8, M=6, Q=3, K=8, the bitmap overhead of directly reporting the first weighting coefficient is S=LMQ=144 bits, and the reporting overhead of the two-level bitmap provided in the embodiment of the present application is LQ+KM=72 bits, saving 72 bits of bitmap overhead. For another example, L=8, M=6, Q=3, K=8, the bitmap overhead of directly reporting the first weighting coefficient is S=LMQ=144 bits, and the reporting overhead of the two-level bitmap provided in the embodiment of the present application is LM+KQ=72 bits, saving 72 bits of bitmap overhead.

In a possible design scheme, the length of the first bitmap is L×A bits, and the length of the second bitmap is K×B bits. Wherein, when the first basis is a Doppler domain basis and the second basis is a frequency domain basis, the length of the first bitmap is LQ bits, and the length of the second bitmap is KM bits; when the first basis is a frequency domain basis and the second basis is a Doppler domain basis, the length of the first bitmap is LM bits, and the length of the second bitmap is KQ bits. In this way, compared with indicating the selected X first weighting coefficients from LMQ first weighting coefficients through a bitmap of LMQ bits in length, the two-level bitmap provided in the embodiment of the present application can reduce feedback overhead.

In a possible design, CSI may include a first field, the first field carries second information, and the second information is used to indicate K. In this way, the number of selected first basis pairs may be determined by the terminal device or predefined by the protocol, and reported by the terminal device to the network device through the first field in the CSI, so that the network device can determine the bitmap overhead in the second field according to the value of K, thereby ensuring that the network device correctly decodes the CSI and improves the decoding success rate. The first field may be a Part I field.

In a possible design scheme, the channel parameter feedback method provided in the embodiment of the present application may further include: the terminal device receives third information from the network device. The third information is used to indicate that the maximum value of K is K _max , K≤K _max , and K _max is a positive integer. In this way, when the terminal device determines K, the terminal device can determine the value of K based on K _max configured by the network device.

In a possible design scheme, the channel parameter feedback method provided in the embodiment of the present application may further include: the terminal device receives fourth information from the network device. The fourth information is used to indicate K. In this way, the number of the selected first basis pairs can also be configured by the network device and sent to the terminal device.

Furthermore, the fourth information may be carried in any one of the following signalings: media access control-control unit MAC-CE signaling, radio resource control RRC signaling or downlink control information DCI signaling.

In a possible design scheme, the CSI may include a second field, and the second field is used to indicate the first group, the second group, and the third group; wherein the first bitmap is carried in the first group or the second group, and the second bitmap is carried in at least one of the second group and the third group. In this way, since the second bitmap depends on the K first basis pairs indicated by the first bitmap, in order to avoid the problem of incomplete feedback of the first bitmap due to limited uplink transmission resources, the first bitmap can be concentrated in the first group or the second group, and the second bitmap can be divided into two groups and placed in the second group and the third group respectively. Among them, the reporting priority of the first group is higher than the reporting priority of the second group, and the reporting priority of the second group is higher than the reporting priority of the third group. Among them, the second field can be a Part II field.

In one possible design, the first group is Group 0, the second group is Group 1, and the third group is Group 2.

In one possible design scheme, K first basis pairs correspond to K second weighting coefficients, the K second weighting coefficients are the weighting coefficients ranked first K in descending order of amplitude among L×A third weighting coefficients, each third weighting coefficient among the L×A third weighting coefficients is obtained by adding the amplitude or the square of the amplitude of the fourth weighting coefficient corresponding to each second basis among the B second basis, and the fourth weighting coefficient is the weighting coefficient corresponding to 1 spatial basis among the L spatial basis and 1 first basis among the A first basis.

In a second aspect, a channel parameter feedback method is provided, which can be executed by a network device, or by a component of the network device, such as a processor, chip, or chip system of the network device, or by a logic module or software that can implement all or part of the network device functions. The following is an explanation of the method being executed by a network device as an example. The channel parameter feedback method includes: the network device receives channel state information CSI from a terminal device. Among them, the CSI includes first information, and the first information is used to indicate X first weighting coefficients out of S first weighting coefficients in a first codebook, the first codebook includes L spatial domain bases, M frequency domain bases, Q Doppler domain bases, and S first weighting coefficients, the first information includes a first bit map and a second bit map, and the first bit map is used to indicate K first basis pairs out of L×A first basis pairs, and the L×A first basis pairs and L The spatial basis corresponds to A first basis, each first basis pair in the L×A first basis pairs and the B second basis correspond to B first weighting coefficients, the first basis is a frequency domain basis or a Doppler domain basis, the second basis is a frequency domain basis or a Doppler domain basis, the first basis is different from the second basis, the second bitmap is used to indicate X first weighting coefficients in the K×B first weighting coefficients, the K×B first weighting coefficients correspond to K first basis pairs and B second basis, S, X, L, M, Q, A, K, B are positive integers, S=L×M×Q, 1≤X≤K×B≤S. The network device determines the precoding matrix according to the first information.

In a possible design, the length of the first bit map is L×A bits, and the length of the second bit map is K×B bits.

In a possible design scheme, the CSI may include a first field, the first field carries second information, and the second information is used to indicate K. The first field may be a Part I field.

In a possible design, the channel parameter feedback method provided in the embodiment of the present application may further include: the network device sends third information to the terminal device, wherein the third information is used to indicate that the maximum value of K is K _max , K≤K _max , and K _max is a positive integer.

In a possible design scheme, the channel parameter feedback method provided in the embodiment of the present application may further include: the network device sends fourth information to the terminal device. The fourth information is used to indicate K.

In a possible design, the CSI may include a second field, and the second field is used to indicate the first group, the second group, and the third group; wherein the first bitmap is carried in the first group or the second group, and the second bitmap is carried in at least one of the second group and the third group. The reporting priority of the first group is higher than the reporting priority of the second group, and the reporting priority of the second group is higher than the reporting priority of the third group. The second field may be a Part II field.

In one possible design scheme, K first basis pairs correspond to K second weighting coefficients, the K second weighting coefficients are the weighting coefficients ranked first K in descending order of amplitude among the L×A third weighting coefficients, and each of the L×A third weighting coefficients is obtained by adding the amplitudes or the squares of the amplitudes of B first weighting coefficients corresponding to each first basis pair in the L×A first basis pairs and the B second basis.

In addition, the technical effects of the channel parameter reporting method described in the second aspect can refer to the technical effects of the channel parameter reporting method described in the first aspect, and will not be repeated here.

In a third aspect, a communication device is provided for implementing the above-mentioned various methods. The communication device may be the terminal device in the above-mentioned first aspect, or a device including the above-mentioned terminal device, or a device included in the above-mentioned terminal device, such as a chip. The communication device includes a corresponding module, unit, or means for implementing the method described in the above-mentioned first aspect, and the module, unit, or means may be implemented by hardware, software, or by executing the corresponding software implementation by hardware. The hardware or software includes one or more modules or units corresponding to the above-mentioned functions.

In some possible designs, the communication device includes: a processing module and a transceiver module. The processing module is used to determine the first information. The first information is used to indicate the X first weighting coefficients selected by the terminal device from the S first weighting coefficients in the first codebook, the first codebook includes the selected L spatial basis, M frequency domain basis, Q Doppler domain basis and S first weighting coefficients, the first information includes a first bit map and a second bit map, the first bit map is used to indicate K first basis pairs selected from L×A first basis pairs, the L×A first basis pairs correspond to the L spatial basis and the A first basis, and the L×A first basis pairs Each first basis pair and B second basis in the B first weighting coefficients correspond to B first weighting coefficients, the first basis is a frequency domain basis or a Doppler domain basis, the second basis is a frequency domain basis or a Doppler domain basis, the first basis is different from the second basis, the second bitmap is used to indicate X first weighting coefficients selected from K×B first weighting coefficients, K×B first weighting coefficients correspond to K first basis pairs and B second basis, S, X, L, M, Q, A, K, B are positive integers, S=L×M×Q, 1≤X≤K×B≤S. A transceiver module is used to send channel state information CSI to a network device. Wherein, CSI includes first information.

In a possible design, the transceiver module is further configured to receive third information from the network device, wherein the third information is used to indicate that the maximum value of K is K _max , K≤K _max , and K _max is a positive integer.

In a possible design solution, the transceiver module is further used to receive fourth information from the network device. The fourth information is used to indicate K.

Optionally, the transceiver module may include a receiving module and a sending module, wherein the sending module is used to implement the sending function of the communication device described in the third aspect, and the receiving module is used to implement the receiving function of the communication device described in the third aspect.

Optionally, the communication device described in the third aspect may further include a storage module, wherein the storage module stores a program or instruction. When the processing module executes the program or instruction, the communication device described in the third aspect may execute the channel parameter reporting method described in the first aspect.

Among them, the technical effects of the communication device described in the third aspect can refer to the technical effects of the channel parameter reporting method described in the first aspect, and will not be repeated here.

In a fourth aspect, a communication device is provided for implementing the above-mentioned various methods. The communication device may be the network device in the above-mentioned second aspect, or a device including the above-mentioned network device, or a device included in the above-mentioned network device, such as a chip. The communication device includes a corresponding module, unit, or means for implementing the method described in the above-mentioned second aspect, and the module, unit, or means may be implemented by hardware, software, or by hardware executing the corresponding software implementation. The hardware or software includes one or more modules or units corresponding to the above-mentioned functions.

In some possible designs, the communication device includes: a processing module and a transceiver module. The transceiver module is used to receive channel state information CSI from a terminal device. The CSI includes first information, the first information is used to indicate X first weighting coefficients among S first weighting coefficients in the first codebook, the first codebook includes L spatial basis, M frequency domain basis, Q Doppler domain basis and S first weighting coefficients, the first information includes a first bitmap and a second bitmap, the first bitmap is used to indicate K first basis pairs among L×A first basis pairs, the L×A first basis pairs correspond to L spatial basis and A first basis, each first basis pair among the L×A first basis pairs and B second basis correspond to B first weighting coefficients, the first basis is a frequency domain basis or a Doppler domain basis, the second basis is a frequency domain basis or a Doppler domain basis, the first basis is different from the second basis, the second bitmap is used to indicate X first weighting coefficients among K×B first weighting coefficients, the K×B first weighting coefficients correspond to K first basis pairs and B second basis, S, X, L, M, Q, A, K, B are positive integers, S=L×M×Q, 1≤X≤K×B≤S. A processing module is used to determine a precoding matrix according to the first information.

In a possible design solution, the transceiver module is further configured to send third information to the terminal device, wherein the third information is used to indicate that the maximum value of K is K _max , K≤K _max , and K _max is a positive integer.

In a possible design solution, the transceiver module is further used to send fourth information to the terminal device, wherein the fourth information is used to indicate K.

Optionally, the transceiver module may include a receiving module and a sending module, wherein the sending module is used to implement the sending function of the communication device described in the fourth aspect, and the receiving module is used to implement the receiving function of the communication device described in the fourth aspect.

Optionally, the communication device described in the fourth aspect may further include a storage module, which stores a program or instruction. When the processing module executes the program or instruction, the communication device described in the fourth aspect can execute the channel parameter reporting method described in the second aspect.

Among them, the technical effects of the communication device described in the fourth aspect can refer to the technical effects of the channel parameter reporting method described in the first aspect, and will not be repeated here.

In a fifth aspect, a communication device is provided, comprising: a processor, the processor being coupled to a memory, the processor being configured to execute a computer program stored in the memory, so that the communication device executes the method described in any possible implementation manner in the first aspect to the second aspect.

In a possible design solution, the communication device described in the fifth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the fifth aspect to communicate with other communication devices.

In an embodiment of the present application, the communication device described in the fifth aspect may be the terminal device in the first aspect or the network device in the second aspect, or a chip (system) or other parts or components that may be arranged in the terminal device or network device, or a device including the terminal device or network device.

Among them, the technical effects of the fifth aspect can refer to the technical effects of the method described in any one of the implementation methods of the first aspect to the second aspect, and will not be repeated here.

In a sixth aspect, a communication system is provided. The communication system includes a terminal device and a network device. The terminal device is used to execute the channel parameter reporting method described in the first aspect, and the network device is used to execute the channel parameter reporting method described in the second aspect.

In a seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program or instruction, and when the computer program or instruction is executed on a computer, the computer executes the method described in any possible implementation of the first aspect to the second aspect.

In an eighth aspect, a computer program product is provided, which includes: a computer program or instructions, which, when executed on a computer, causes the computer to execute the method described in any possible implementation of the first aspect to the second aspect.

In a ninth aspect, a chip system is provided. The chip system includes: at least one processor and an interface, wherein the at least one processor is coupled to a memory via the interface, and when the at least one processor executes a computer program or instruction in the memory, the method described in any possible implementation of the first aspect to the second aspect is executed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

FIG2 is a schematic diagram of a flow chart of a channel parameter reporting method provided in an embodiment of the present application;

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

FIG4 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.

Detailed ways

To facilitate understanding, the technical terms involved in the embodiments of the present application are first introduced below.

1. Precoding technology

Precoding technology can also be called beamforming technology. The transmitting device (such as a network device) can process the signal to be transmitted with the help of a precoding matrix matching the CSI when the channel state (CSI) is known, so that the precoded signal to be transmitted is adapted to the channel, thereby reducing the complexity of the receiving device (such as a terminal device) in eliminating the influence between channels. Among them, by precoding the signal to be transmitted, the quality of the received signal (such as signal to interference plus noise ratio (SINR)) can be improved. Therefore, by adopting the precoding technology, the transmitting device and multiple receiving devices can transmit signals on the same time-frequency resources, that is, multiple user multiple input multiple output (MU-MIMO) is realized. It should be noted that the relevant description of the precoding technology is only for the sake of understanding and is not used to limit the protection scope of the embodiments of the present application. In the specific implementation process, the transmitting device can also perform precoding in other ways. For example, when channel information (such as but not limited to the channel matrix) is not known, a preset precoding matrix or weighted processing method is used for precoding, etc. For the sake of brevity, the specific content is not repeated herein.

Among them, the implementation of precoding technology depends on CSI measurement and feedback. At present, the process of CSI measurement by network equipment and terminal equipment includes: the network equipment sends channel measurement configuration information to the terminal equipment to notify the terminal equipment of the time to perform channel measurement and related configuration information. Furthermore, the network equipment sends a pilot signal for channel measurement to the terminal equipment, which can also be called a reference signal, such as a channel state information reference signal (CSI-RS), so that the terminal equipment can use the pilot signal to perform channel estimation to obtain CSI, and feed back CSI to the network equipment through a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH). Among them, CSI can include one or more of the following: PMI, CQI, CSI-RS resource indicator (CRI), layer indicator (LI), and RI, etc.

Optionally, the terminal device may perform CSI calculation on the channel measured by the CSI-RS through singular value decomposition (SVD) or eigen value decomposition (EVD), or the terminal device may also perform CSI calculation in other ways, which is not specifically limited in the embodiments of the present application.

Among them, the measurement accuracy and timely feedback of CSI are the key to effectively obtain MIMO transmission performance. Considering that CSI requires higher measurement accuracy and lower feedback overhead, the feedback of CSI in the NR system is mainly implicit feedback. In implicit feedback, the terminal device feeds back the precoding matrix in the form of a recommended PMI, and the network device can directly use the precoding matrix recommended by the terminal device for precoding. Exemplarily, the terminal device determines the feedback PMI according to the codebook, and the feedback PMI represents the precoding matrix recommended by the terminal device. The network device can determine the corresponding precoding matrix according to the codebook based on the feedback PMI, and preprocess the downlink data according to the precoding matrix. In this way, while feeding back higher measurement accuracy, a low feedback overhead can be maintained.

In the above implicit feedback, the focus is on the design of the codebook. The codebook in the NR system is introduced below.

2. Codebook

A codebook is a set of multiple precoding matrices. The multiple precoding matrices may be predefined. Codebooks may be divided into different types, such as type I codebooks, type II codebooks, or enhanced type II codebooks specified in 3GPP technical specification (TS) 38.214.

In the traditional codebook, the structure of the codebook can be expressed as Where W represents the precoding matrix, _W1 represents the spatial domain matrix, and _Wf represents the frequency domain matrix. represents the conjugate transposed matrix of the frequency domain matrix, Represents a space-frequency weighting coefficient matrix associated with a space-domain matrix and a frequency-domain matrix. It is understood that the precoding matrix can be represented as a weighted sum of one or more precoding vectors. The precoding vector can be a vector composed of a space-domain vector in the space-domain matrix and a frequency-domain vector in the frequency-domain matrix. For example, the precoding vector can be the product of a space-domain vector and a frequency-domain vector.

2.1. Spatial domain vector: It can also be called angle vector, spatial component vector, beam vector, spatial beam basis vector, spatial basis vector, or spatial basis. A spatial domain vector can correspond to a beam or a beam direction. A spatial domain vector can be one of the vectors used to construct a channel matrix. Each element in the spatial domain vector can represent the weight of each antenna port. Based on the weights of each antenna port represented by each element in the spatial domain vector, the signals of each antenna port are linearly superimposed to form an area with a strong signal in a certain direction in space. The dimension of the spatial domain vector can represent the number of antenna ports.

Optionally, the spatial domain vector is any one of the following vectors: discrete Fourier transform (DFT) A vector, a conjugate transposed vector of a DFT vector, an oversampled DFT vector, a conjugate transposed vector of an oversampled DFT vector, or a wavelet transform (WT) vector. A DFT vector may refer to a vector in a DFT matrix, a DFT conjugate transposed vector may refer to a column vector in a conjugate transposed matrix of a DFT matrix, an oversampled DFT vector may refer to a vector in an oversampled DFT matrix, and a WT vector may refer to a column vector in a WT matrix.

Optionally, in the embodiment of the present application, the spatial matrix _W1 may be a matrix consisting of one or more spatial vectors selected from the spatial vector set. The spatial vector set may be pre-configured; or, the spatial vector set may be negotiated between the terminal device and the network device; or, the spatial vector set may be agreed upon by a protocol, which is not specifically limited in the embodiment of the present application.

Exemplarily, the set of spatial domain vectors can be a complete orthogonal basis matrix, such as a DFT matrix, a conjugate transposed matrix of a DFT matrix, an oversampled DFT matrix, or a conjugate transposed matrix of an oversampled DFT matrix, etc., which is not specifically limited in the embodiments of the present application.

Exemplarily, the dimension of the spatial domain vector set is N ₁ ×N ₁ , where N ₁ may represent the dimension of the spatial domain vector, N ₁ is equal to the number of antenna ports, and N ₁ is a positive integer greater than 1. The dimension of the spatial domain vector is N ₁ × 1. The dimension of the spatial domain vector may also be used to represent the number of elements in the spatial domain vector, for example, the spatial domain vector includes N ₁ elements.

Optionally, in an embodiment of the present application, the dimension of the spatial vector set may be pre-configured, or negotiated between the terminal device and the network device, or agreed upon by a protocol, and this embodiment of the present application does not specifically limit this.

Optionally, the number of spatial domain vectors in the spatial domain matrix _W1 may be pre-configured or negotiated between the terminal device and the network device, and this embodiment of the present application does not impose any specific limitation on this.

Exemplarily, taking the transmitting antenna as a dual-polarization directional antenna as an example, the terminal device can select L spatial vectors from the spatial vector set, wherein each polarization direction can select L ₁ spatial vectors from the spatial vector set, and the dual-polarization direction can select 2L ₁ spatial vectors from the spatial vector set, that is, L=2L ₁ , L can represent the number of spatial vectors in the spatial matrix W ₁ , L is a positive integer greater than 1, L ₁ is a positive integer greater than or equal to 1, and L is less than N ₁ . Among them, N ₁ ×L can represent the dimension of the spatial matrix W ₁ .

2.2. Frequency domain vector: It can also be called delay vector, frequency domain component vector, frequency domain basis vector, or frequency domain basis, etc. It is a vector that can be used to represent the change law of the channel in the frequency domain. A frequency domain vector can correspond to a delay path or a delay domain path. Each frequency domain vector can represent a change law. When a signal is transmitted through a wireless channel, it can reach the receiving antenna from the transmitting antenna through multiple paths. Multipath delay causes frequency selective fading, which is the change of the frequency domain channel. Therefore, different frequency domain vectors can be used to represent the change law of the channel in the frequency domain caused by delays on different transmission paths.

Optionally, the frequency domain vector is any one of the following vectors: a DFT vector, a conjugate transpose vector of a DFT vector, an oversampled DFT vector, a conjugate transpose vector of an oversampled DFT vector, a discrete cosine transform (DCT) vector, a conjugate transpose vector of a DCT vector, an oversampled DCT vector, or a conjugate transpose vector of an oversampled DCT vector. For example, the frequency domain vector may be a DFT vector defined in Type II in 3GPP TS 38.214.

Optionally, in the embodiment of the present application, the frequency domain matrix _Wf may be a matrix consisting of one or more frequency domain vectors selected from the frequency domain vector set. The frequency domain vector set may be pre-configured; or, the frequency domain vector set may be negotiated between the terminal device and the network device; or, the frequency domain vector set may be agreed upon by a protocol, which is not specifically limited in the embodiment of the present application.

Exemplarily, the frequency domain vector set can be a complete orthogonal basis matrix, such as a DFT matrix, a conjugate transposed matrix of a DFT matrix, an oversampled DFT matrix, or a conjugate transposed matrix of an oversampled DFT matrix, etc., which is not specifically limited in the embodiments of the present application.

Exemplarily, the dimension of the frequency domain vector set is N ₃ ×N ₃ , where N ₃ may represent the dimension of the frequency domain vector, and N ₃ may be equal to the number of frequency domain units, which is an integer greater than 1. The dimension of the frequency domain vector is N ₃ ×1.

Optionally, in an embodiment of the present application, the dimension of the frequency domain vector set and the number of frequency domain vectors may be pre-configured, or negotiated between the terminal device and the network device, or agreed upon by a protocol, and the embodiment of the present application does not specifically limit this.

Optionally, in an embodiment of the present application, the number of frequency domain vectors in the frequency domain matrix W _f may be pre-configured or negotiated between the terminal device and the network device, and the embodiment of the present application does not specifically limit this.

Optionally, in an embodiment of the present application, the number of frequency domain vectors in the frequency domain matrix _Wf may be the same as the number of frequency domain units.

Exemplarily, the terminal device selects M frequency domain vectors from the frequency domain vector set, where M may represent the number of frequency domain vectors in the frequency domain matrix _Wf , and M is an integer greater than or equal to 1, and M is less than _N3 , and _N3 ×M may represent the dimension of the frequency domain matrix _Wf .

Optionally, in the embodiment of the present application, the frequency domain unit may refer to one or more consecutive physical resource blocks (PRBs). The size of the frequency domain unit (i.e., the number of PRBs included) and the bandwidth part (bandwidth part) are Bandwidth related.

2.3. Weighting coefficient: It can also be called merging coefficient, space-frequency merging coefficient, space-frequency weighting coefficient, superposition coefficient, etc. Each weighting coefficient can correspond to a space-domain vector and a frequency-domain vector, or in other words, each weighting coefficient can correspond to a space-frequency vector pair. Each merging coefficient is the weighting coefficient of the space-frequency component matrix constructed by the space-frequency vector pair to which it corresponds. Weighting coefficient matrix The total number of elements in is the product of the number of spatial domain vectors in the spatial domain matrix and the number of frequency domain vectors in the frequency domain matrix. One weighting coefficient corresponds to one spatial domain vector and one frequency domain vector. Specifically, the weighting coefficient matrix The element in the i-th row and j-th column is the merging coefficient corresponding to the space-frequency vector pair composed of the i-th space-domain vector and the j-th frequency-domain vector.

Optionally, in the embodiment of the present application, the weighting coefficient may be a complex number. The weighting coefficient may be expressed in the form of a real part and an imaginary part; or, the weighting coefficient may also be expressed in the form of an amplitude and a phase, which is not specifically limited in the embodiment of the present application. Exemplarily, for the enhanced type II codebook, the weighting coefficient is a complex number.

Alternatively, optionally, the weighting coefficient in the embodiment of the present application may be a real number. Exemplarily, for a type I codebook, the weighting coefficient is a real number.

3. Medium- and high-speed CSI codebook (mobility enhancement codebook) structure

3GPP proposed a CSI enhancement goal in Rel-18 MIMO project: In order to deal with the problem that CSI changes rapidly over time and the feedback PMI is easily out of date in medium and high-speed mobile scenarios, an enhanced CSI measurement method and an enhanced codebook structure are proposed. The codebook structure can be expressed as Among them, W, _W1 and _Wf are the same as the relevant definitions in Rel-16, and can refer to the above description for details. Wd represents the space-frequency time weighting coefficient matrix, and _Wd represents the Doppler domain matrix. The Doppler domain matrix _Wd and the frequency domain matrix _Wf can form a joint matrix through the Kronecker product. Of course, the Doppler domain matrix _Wd and the frequency domain matrix _Wf can also form a joint matrix through other coupling methods. In other words, the joint matrix includes the Doppler domain matrix _Wd and the frequency domain matrix _Wf . Space-frequency time weighting coefficient matrix Each weighting coefficient in corresponds to a spatial domain vector, a frequency domain vector, and a Doppler domain vector.

Doppler domain vector: It can also be called time domain component vector, time-varying domain basis vector, time domain basis vector, Doppler domain basis, or time domain vector, etc. It is a vector that can be used to represent the changing law of the channel in the time domain. A time domain vector or a Doppler domain basis can correspond to a Doppler path or a Doppler shift. Each time domain vector can represent a changing law. When the signal is transmitted through the wireless channel at different times, the time selective fading caused by multipath and the mobility of the transmitter or receiver is the change of the time domain channel. Therefore, different time domain vectors can be used to represent the changing law of the channel in the time domain.

Doppler shift can also be called Doppler frequency deviation or Doppler frequency shift, which indicates the frequency shift caused by the movement of the terminal device or base station or other factors. Doppler shift can indicate the magnitude of the frequency shift, or it can indicate a channel time domain variation law. When the signal is transmitted through the wireless channel at different times, the time selective fading caused by multipath and the mobility of the transmitter or receiver is the change of the time domain channel, and each delay path of the channel may experience different mobile environments, so each delay path or frequency domain basis will correspond to one or more Doppler shifts. A delay path or frequency domain basis and a corresponding Doppler shift, or a Doppler shift and an associated delay path or frequency domain basis, constitute a Doppler shift and frequency domain basis pair.

Optionally, in an embodiment of the present application, each Doppler domain vector may correspond to a Doppler frequency shift. Therefore, different Doppler domain vectors may be used to represent the change pattern of the channel in the time domain caused by the Doppler frequency shift of different transmission paths. Generally speaking, in order to facilitate the description of the change in the channel time domain, the time domain channel may be projected or mapped to the Doppler domain and represented by a weighted exponential function of several slowly varying Doppler frequency shifts.

Optionally, the Doppler domain vector is one or more of a DFT vector, an oversampled DFT vector, a WT vector, or an oversampled WT vector, which is not limited in the embodiments of the present application.

Optionally, in the embodiment of the present application, the Doppler domain matrix _Wd may be a matrix consisting of one or more Doppler domain vectors selected from a Doppler domain vector set. The Doppler domain vector set may be pre-configured; or, the Doppler domain vector set may be negotiated between the terminal device and the network device; or, the Doppler domain vector set may be agreed upon by a protocol, which is not specifically limited in the embodiment of the present application.

Exemplarily, the Doppler domain vector set may be a complete orthogonal basis matrix, such as a DFT matrix, a conjugate transposed matrix of a DFT matrix, an oversampled DFT matrix, or a conjugate transposed matrix of an oversampled DFT matrix, etc., which is not specifically described in the embodiments of the present application. limited.

Exemplarily, the dimension of the Doppler domain vector set is N ₄ ×N ₄ , where N ₄ can represent the dimension of the Doppler domain vector, N ₄ is greater than or equal to the number of times when the PMI is valid, and N ₄ is an integer greater than 1. Among them, the dimension of the Doppler domain vector is N ₄ ×1. The dimension of the Doppler domain vector can also be used to represent the number of elements in the Doppler domain vector, for example, the Doppler domain vector includes N ₄ elements. The N ₄ ×N ₄ dimensional Doppler domain vector set can be understood as: dividing the maximum Doppler frequency shift D into N ₄ parts, and the N ₄ Doppler domain vectors in the N ₄ -dimensional Doppler domain vector set correspond to the N ₄ Doppler frequency shifts.

Optionally, in an embodiment of the present application, the dimension of the Doppler domain vector set may be pre-configured, or negotiated between the terminal device and the network device, or agreed upon by a protocol, and the embodiment of the present application does not specifically limit this.

Optionally, in an embodiment of the present application, the number of Doppler domain vectors in the Doppler domain matrix _Wd may be pre-configured or negotiated between the terminal device and the network device, and this embodiment of the present application does not specifically limit this.

Exemplarily, the terminal device may select Q Doppler domain vectors from the Doppler domain vector set, where Q may represent the number of Doppler domain vectors in the Doppler domain matrix _Wd , Q is a positive integer greater than or equal to 1, Q is less than _N4 , and _N4 ×Q may represent the dimension of the Doppler domain matrix _Wd .

At present, for the mobility enhancement codebook, due to the additional introduction of the Doppler domain dimension, when the selected spatial domain basis is L, the selected frequency domain basis is M, and the selected Doppler domain basis is Q, the corresponding space-frequency-time weighting coefficient is LMQ. The above-mentioned basis is selected by the terminal device according to the pilot signal sent by the network device to form the spatial domain matrix, frequency domain matrix, Doppler domain matrix and space-frequency-time weighting coefficient matrix in the CSI codebook. When the terminal device feeds back the weighting coefficient to the network device, it usually does not feed back or report all LMQ space-frequency-time weighting coefficients, but selects some space-frequency-time weighting coefficients from the LMQ weighting coefficients for feedback or reporting, in order to reduce the overhead of reporting the space-frequency-time weighting coefficients.

For reporting of weighting coefficients, the terminal device usually indicates in the form of a bitmap, such as using LMQ bits to represent LMQ space-frequency weighting coefficients, and each bit indicates whether the weighting coefficient is selected through a 0 or 1 state. The feedback overhead of the bitmap is LMQ bits, which increases the overhead of the bitmap compared to the LM bits of space-frequency weighting coefficients fed back through the bitmap in the traditional codebook structure.

To this end, an embodiment of the present application provides a channel parameter reporting method, which can reduce the feedback overhead of the space-frequency time weighting coefficient corresponding to the codebook.

The technical solution in this application will be described below in conjunction with the accompanying drawings.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as wireless fidelity (WiFi) systems, vehicle to everything (V2X) communication systems, device-to-device (D2D) communication systems, Internet of Vehicles communication systems, 4th generation (4G) mobile communication systems such as long term evolution (LTE) systems, worldwide interoperability for microwave access (WiMAX) communication systems, fifth generation (5G) mobile communication systems such as new radio (NR) systems, and future communication systems such as sixth generation (6G) mobile communication systems.

The present application will present various aspects, embodiments or features around a system that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and/or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. In addition, combinations of these schemes may also be used.

In addition, in the embodiments of the present application, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

In the embodiments of the present application, "information", "signal", "message", "channel" and "signaling" may be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are consistent. "of", "corresponding, relevant" and "corresponding" may be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are consistent.

In the embodiments of the present application, sometimes a subscript such as _W1 may be mistakenly written as a non-subscript such as W1. When the difference is not emphasized, the meanings to be expressed are consistent.

The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. It is known to those skilled in the art that with the development of network architecture, With the evolution and emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

Exemplarily, FIG1 is an architecture diagram of a communication system provided in an embodiment of the present application. As shown in FIG1 , the communication system includes a network device and a terminal device. FIG1 shows an example of 1 network device and 1 terminal device, and the embodiment of the present application does not limit the number of network devices and terminal devices.

In the embodiments of the present application, each communication device, such as a network device or a terminal device, may be configured with multiple antennas, which may include at least one transmitting antenna for sending signals and at least one receiving antenna for receiving signals. In addition, each communication device also additionally includes a transmitter chain and a receiver chain, and those skilled in the art can understand that they may include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers, demodulators, demultiplexers or antennas, etc.). Therefore, the network device and the terminal device can communicate through multi-antenna technology.

The network device in the embodiment of the present application is a device located on the network side of the above-mentioned communication system and having a wireless transceiver function, or a chip or chip system that can be set in the device. The network device includes but is not limited to: an access point (AP) in a wireless fidelity (WiFi) system, such as a home gateway, a router, a server, a switch, a bridge, etc., an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved NodeB, or home Node B, H The invention may also be a 5G network, such as a gNB in a new radio (NR) system, or a transmission point (TRP or TP), one or a group of (including multiple antenna panels) antenna panels of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU), a distributed unit (DU), a road side unit (RSU) with base station functions, etc.

The terminal device in the embodiment of the present application is a terminal that accesses the above-mentioned communication system and has a wireless transceiver function or a chip or chip system that can be set in the terminal. The terminal device can also be called a user device, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. The terminal device in the embodiment of the present application can be a mobile phone, a tablet computer, a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a vehicle-mounted terminal, an RSU with terminal function, etc. The terminal device of the present application may also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit that is built into the vehicle as one or more components or units. The vehicle may implement the channel parameter reporting method provided in the present application through the built-in vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit.

It should be noted that the channel parameter reporting method provided in the embodiment of the present application can be applicable between the terminal device and the network device shown in Figure 1. The specific implementation can refer to the following method embodiment, which will not be repeated here.

It should be noted that the solutions in the embodiments of the present application can also be applied to other communication systems, and the corresponding names can also be replaced by the names of corresponding functions in other communication systems.

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

In order to better understand the embodiments of the present application, the following explanations are made before introducing the embodiments of the present application.

First, in the embodiments of the present application, the meaning of the multiplication of "×" in "L×M×Q", "L×A", etc. can also be expressed by omitting "×", such as "LMQ", "LA", etc. It should be pointed out that when the difference is not emphasized, the meaning to be expressed is the same.

Second, in this application, "used to indicate" may include being used for direct indication and being used for indirect indication. When describing that a certain "indication information" is used to indicate A, it may include that the indication information directly indicates A or indirectly indicates A, but it does not mean that the indication information must carry A.

The information indicated by the indication information is called the information to be indicated. There are many ways, for example but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein the other information is associated with the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved with the help of the arrangement order of each piece of information agreed in advance (for example, stipulated by the protocol), thereby reducing the indication overhead to a certain extent. At the same time, the common parts of each piece of information can also be identified and indicated uniformly to reduce the indication overhead caused by indicating the same information separately.

In addition, the specific indication method can also be various existing indication methods, such as but not limited to the above-mentioned indication methods and various combinations thereof. The specific details of the various indication methods can refer to the prior art and will not be repeated herein. As can be seen from the above, for example, when it is necessary to indicate multiple information of the same type, different indication methods may be used for different information. In the specific implementation process, the desired indication method can be selected according to specific needs. The embodiment of the present application does not limit the selected indication method. In this way, the indication method involved in the embodiment of the present application should be understood to cover various methods that can enable the party to be indicated to obtain the information to be indicated.

The information to be indicated can be sent as a whole, or divided into multiple sub-information and sent separately, and the sending period and/or sending time of these sub-information can be the same or different. The specific sending method is not limited in this application. Among them, the sending period and/or sending time of these sub-information can be pre-defined, for example, pre-defined according to the protocol, or configured by the transmitting device by sending configuration information to the receiving device. Among them, the configuration information can, for example, but not limited to, include one or a combination of at least two of radio resource control (radio resource control, RRC) signaling, medium access control (medium access control, MAC) layer signaling and physical layer signaling. Among them, MAC layer signaling, for example, includes MAC control element (control element, CE); physical (physical, PHY) layer signaling, for example, includes downlink control information (downlink control information, DCI).

Third, in the embodiments shown below, the first, second and various digital numbers are only used for the convenience of description and are not used to limit the scope of the embodiments of the present application. For example, to distinguish different indication information.

Fourth, "pre-definition" or "pre-configuration" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a terminal device and a network device), and the present application does not limit its specific implementation method. Among them, "saving" can mean saving in one or more memories. The one or more memories can be set separately or integrated in an encoder or decoder, a processor, or a communication device. The one or more memories can also be partially set separately and partially integrated in a decoder, a processor, or a communication device. The type of memory can be any form of storage medium, which is not limited by the present application.

Fifth, the “protocol” involved in the embodiments of the present application may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, which is not limited in the present application.

The channel parameter reporting method provided in the embodiment of the present application will be specifically described below in conjunction with Figure 2.

For example, Fig. 2 is a flow chart of a channel parameter reporting method provided in an embodiment of the present application. The channel parameter reporting method can be applied to the communication system shown in Fig. 1 .

As shown in FIG2 , the channel parameter reporting method includes the following steps:

S201. The terminal device determines first information.

The first information is used to indicate X first weighting coefficients selected by the terminal device from S first weighting coefficients in the first codebook, the first codebook may include L selected spatial basis, M frequency basis, Q Doppler domain basis and S first weighting coefficients, each of the S first weighting coefficients corresponds to 1 spatial basis in the L spatial basis, 1 frequency basis in the M frequency basis and 1 Doppler domain basis in the Q Doppler domain basis, S, X, L, M, Q are positive integers, S = L × M × Q. The selected X first weighting coefficients are the first weighting coefficients that the terminal device needs to report to the network device.

Exemplarily, the first codebook is obtained by the terminal device using the reference signal (such as CSI-RS) sent by the network device to perform channel estimation, and is used to determine the CSI so that the network device can perform precoding design. The first codebook in the embodiment of the present application includes three dimensions: spatial domain, frequency domain, and Doppler domain. The mobility enhancement codebook structure proposed in Rel-18 can be used to solve the problem of CSI expiration caused by Doppler changes caused by the time-varying characteristics of the channel in the medium and high-speed mobile scenarios of the terminal device. That is, the first codebook consists of the spatial domain matrix _W1 , the frequency domain matrix _Wf , the Doppler domain matrix _Wd , and the first weighting coefficient matrix associated with the three matrices. It should be understood that the embodiments of the present application do not exclude the possibility of other codebook structures defined in future protocols to achieve the same or similar functions.

Optionally, the L spatial domain bases, M frequency domain bases and Q Doppler domain bases that respectively constitute the spatial domain matrix, frequency domain matrix and Doppler domain matrix of the first codebook can be selected by the terminal device from a set of spatial domain bases, a set of frequency domain bases and a set of Doppler domain bases predefined by the protocol, negotiated between the terminal device and the network device, or configured by the network device to the terminal device.

Furthermore, the terminal device may determine a first weighting coefficient matrix including S first weighting coefficients according to L spatial domain bases, M frequency domain bases, and Q Doppler domain bases. Each first weighting coefficient corresponds to or is associated with one of the L spatial basis, one of the M frequency basis, and one of the Q Doppler domain basis, that is, S = LMQ. Thus, the first information can be used to instruct the terminal device to select the first weighting coefficient matrix from the first weighting coefficient matrix. The first weighting coefficient selected in .

It is worth noting that the L spatial bases in the embodiment of the present application may correspond to a transmitting antenna in a single polarization direction or a transmitting antenna in a dual polarization direction. That is to say, assuming that the number of antenna ports of the network device in one polarization direction is L ₁ , then for a transmitting antenna in a single polarization direction, the number of spatial bases selected is L=L ₁ ; for a transmitting antenna in a dual polarization direction, the number of spatial bases selected is L=2L ₁ , where L ₁ is a positive integer.

In the embodiment of the present application, the first information includes a first bitmap and a second bitmap. That is, the terminal device can indicate the first weighting coefficient matrix through the two bitmaps. The X first weighted coefficients that need to be reported.

Among them, the first bitmap is used to indicate K first basis pairs selected from L×A first basis pairs, and A is a positive integer. The L×A first basis pairs correspond to L spatial basis and A first basis. In other words, any one of the L spatial basis and any one of the A first basis can constitute a first basis pair, and the L spatial basis and the A first basis constitute L×A first basis pairs. The first basis can be a frequency domain basis or a Doppler domain basis. In one possible way, the first basis is a frequency domain basis, in which case A=M. In another possible way, the first basis is a Doppler domain basis, in which case A=Q.

Each first basis pair of the L×A first basis pairs and the B second basis correspond to B first weighting coefficients. The second bitmap is used to indicate X first weighting coefficients selected from K×B first weighting coefficients, and the K×B first weighting coefficients correspond to the K first basis pairs and the B second basis, and B is a positive integer. Among them, the second basis is a frequency domain basis or a Doppler domain basis, and the first basis is different from the second basis. For example, when the first basis is a frequency domain basis, the second basis is a Doppler domain basis; when the first basis is a Doppler domain basis, the second basis is a frequency domain basis.

It can be understood that the length of the first bitmap is L×A bits, and the length of the second bitmap is K×B bits. That is, each bit in the first bitmap indicates a first basis pair, and the selected first basis pair is indicated by taking the value of each bit as 0 or 1; each bit in the second bitmap indicates a first weighting coefficient, and the selected first weighting coefficient is indicated by taking the value of each bit as 0 or 1.

The number K of selected first basis pairs can be determined by the terminal device or predefined by the protocol, or can be configured by the network device to the terminal device. Exemplarily, when the network device is configured, the network device can send fourth information to the terminal device, and correspondingly, the terminal device receives fourth information from the network device. Among them, the fourth information is used to indicate the selected number of first basis pairs, that is, the fourth information is used to indicate K. Exemplarily, the fourth information can be carried in MAC-CE signaling or RRC signaling or DCI signaling. Thus, the terminal device can select K first basis pairs from L×A first basis pairs according to the required K value, and select X first weighting coefficients from the K×B first weighting coefficients corresponding to the selected K first basis pairs and B second basis pairs for reporting.

In one possible design scheme, K first basis pairs correspond one-to-one to K second weighting coefficients, the K second weighting coefficients are the weighting coefficients ranked first K in descending order of amplitude among the L×A third weighting coefficients, and each of the L×A third weighting coefficients is obtained by adding the amplitudes or the squares of the amplitudes of B first weighting coefficients corresponding to each first basis pair in the L×A first basis pairs and the B second basis.

It can be understood that, for B second bases, each first base pair in the L×A first base pairs corresponds to B second bases, and different second bases correspond to different first weighting coefficients with the same first base pair, that is, B second bases correspond to B first weighting coefficients with the same first base pair, and B second bases correspond to L×A×B first weighting coefficients with L×A first base pairs. In other words, each first base pair in the L×A first base pairs and the B second bases correspond to B first weighting coefficients.

Thus, the terminal device can respectively add up the B first weighting coefficients corresponding to each of the L×A first basis pairs to obtain L×A third weighting coefficients. The sum of the B first weighting coefficients corresponding to each first basis pair can be The amplitudes (also referred to as moduli) of the B first weighting coefficients corresponding to each first basis pair are added together, or the squares of the amplitudes of each first weighting coefficient in the B first weighting coefficients corresponding to each first basis pair are added together. This embodiment of the present application does not make any specific limitation on this.

Furthermore, the terminal device can select K first basis pairs from L×A first basis pairs based on L×A third weighting coefficients, and the K first basis pairs are the first basis pairs corresponding to the K third weighting coefficients with the top K amplitudes among the L×A third weighting coefficients.

It can be understood that the L×A×B first weighting coefficients corresponding to the B second basis and the L×A first basis are S first weighting coefficients, and the terminal device selects K first basis pairs, which is equivalent to making a selection from the S first weighting coefficients, and obtains K×B first weighting coefficients, that is, KB≤S. Therefore, the first bitmap can also be used to indicate the K×B first weighting coefficients selected from the S first weighting coefficients. Furthermore, the terminal device selects the K×B first weighting coefficients again, and obtains X first weighting coefficients, that is, X≤KB, and the X first weighting coefficients are the first weighting coefficients that the terminal device needs to report.

Exemplarily, when the first basis is a Doppler domain basis, the second basis is a frequency domain basis, that is, A=Q, B=M, the first basis pair is a space-time domain basis pair, and there are L×Q space-time domain basis pairs. For M frequency domain basis pairs, each space-time domain basis pair corresponds to M first weighting coefficients. Thus, the terminal device can add the amplitude or the square of the amplitude of the M first weighting coefficients corresponding to each space-time domain basis pair to obtain a third weighting coefficient, and the L×Q space-time domain basis pairs correspond to the L×Q third weighting coefficients. Then, based on the L×Q third weighting coefficients, K space-time domain basis pairs are selected, and the K space-time domain basis pairs are space-time domain basis pairs corresponding to the first K third weighting coefficients (i.e., K second weighting coefficients) in the L×Q third weighting coefficients in descending order of amplitude. Furthermore, the terminal device selects X first weighting coefficients from the K×M first weighting coefficients corresponding to the selected K space-time domain basis pairs and the M frequency band basis and reports them to the network device. The X first weighting coefficients can be the first weighting coefficients ranked in the first X order from large to small in amplitude among the K×M first weighting coefficients. Based on this, the first bitmap in the first information is used to indicate the K space-time domain basis pairs selected from the L×Q space-time domain basis pairs, and the second bitmap is used to indicate the X first weighting coefficients selected from the K×M first weighting coefficients. It can be understood that X≤KM≤S. In this case, the overhead of the first bitmap is L×Q, the overhead of the second bitmap is K×M, and the overhead of the total bitmap is LQ+KM.

As another example, when the first basis is a frequency domain basis, the second basis is a Doppler domain basis, that is, A=M, B=Q, the first basis pair is a space-frequency domain basis pair, and the space-frequency domain basis pairs are L×M. For Q Doppler domain basis, each space-frequency domain basis corresponds to Q first weighting coefficients. Thus, the terminal device can add the amplitude or the square of the amplitude of the Q first weighting coefficients corresponding to each space-frequency domain basis to obtain a third weighting coefficient, and the L×M space-frequency domain basis corresponds to the L×M third weighting coefficients. Then, based on the L×M third weighting coefficients, K space-frequency domain basis pairs are selected, and the K space-frequency domain basis pairs are space-frequency domain basis pairs corresponding to the first K third weighting coefficients (i.e., K second weighting coefficients) in the L×M third weighting coefficients in descending order of amplitude. Furthermore, the terminal device selects X first weighting coefficients from the K×Q first weighting coefficients corresponding to the selected K space-frequency domain basis pairs and Q Doppler domain basis and reports them to the network device. The X first weighting coefficients can be the first weighting coefficients ranked in the first X order from large to small in amplitude among the K×Q first weighting coefficients. Based on this, the first bitmap in the first information is used to indicate the K space-frequency domain basis pairs selected from the L×M space-frequency domain basis pairs, and the second bitmap is used to indicate the X first weighting coefficients selected from the K×Q first weighting coefficients. It can be understood that X≤KQ≤S. In this case, the overhead of the first bitmap is L×M, the overhead of the second bitmap is K×Q, and the overhead of the total bitmap is LM+KQ.

It is worth noting that in the embodiment of the present application, the terminal device first selects the first weighting coefficient from the basis of two dimensions, and then combines the basis of the third dimension to make a second selection of the first weighting coefficient. Among them, the basis of the two dimensions first selected are based on the spatial basis to select a basis of any dimension from the frequency domain basis or the Doppler domain basis for combination. For the combination of the spatial basis and the frequency domain basis, it is selected based on the traditional two-dimensional code book structure; for the combination of the spatial basis and the Doppler domain basis, it is selected based on the characteristics of the similar Doppler frequency deviation under the same beam (spatial basis). In addition, when the first basis pair is a space-time domain basis pair and a space-frequency domain basis pair, the values of K and X may be different or the same, and the embodiment of the present application does not limit this.

S202: The terminal device sends CSI to the network device. Correspondingly, the network device receives the CSI from the terminal device.

Among them, CSI includes first information.

In one possible implementation, the terminal device may report the CSI to the network device via the PUSCH or PUCCH.

In a possible implementation, when the number K of the selected first basis pairs is determined by the terminal device or predefined by the protocol, In some cases, the CSI may also include second information, where the second information is used to indicate K.

In one possible implementation, the CSI includes a first field, and the second information is carried in the first field. The first field may also carry RI, CQI and layer indicator (LI), etc. The first field may correspond to the Part I field defined in the existing 3GPP TS38.214, and its overhead is a fixed bit length and has a fixed payload size. Wherein, in the case where K is determined or predefined by the terminal device, optionally, the network device configures the maximum value K _max of K for the terminal device, or the protocol predefines the maximum value K _max of K, that is, K≤K _max , that is, K determined by the terminal device cannot exceed K _max . Exemplarily, the network device may send third information to the terminal device, and correspondingly, the terminal device receives the third information from the network device. Wherein, the third information is used to indicate that the maximum value of K is K _max . The third information may be carried in MAC-CE signaling, RRC signaling or DCI signaling. Based on this, the overhead of carrying the second information in the first field may be Bit, Indicates rounding up.

Optionally, the terminal device may report multiple CQIs in the CSI, and the slot indexes (slots index) or slot unit indexes (slot_unit index) corresponding to the multiple CQIs also need to be reported. The number P (P is a positive integer) of reported CQIs may also be carried and reported in the first field, and the network device may configure the maximum value of P for the terminal device to be P _max , or the maximum value of P to be P _max , that is, P ≤ P _max . Based on this, the overhead of indicating the number P of CQIs in the first field may be Bit.

In one possible implementation, the CSI includes a second field, and the first information can be carried in the second field. It is understandable that the second field can also carry the values of X first weighting coefficients (such as indication information of amplitude and/or phase), indication information of L spatial domain bases (such as indexes of L spatial domain bases), indication information of M frequency domain bases (such as indexes of M frequency domain bases), and indication information of Q Doppler domain bases (indexes of Q Doppler domain bases), etc. The second field can correspond to the Part II field defined in 3GPP TS 38.214. It is understandable that the first field and the second field can be independently encoded, the payload size of the first field can be predefined, and the payload size of the second field can be determined based on the information carried in the first part.

Furthermore, the second field can be used to indicate the first group, the second group and the third group. The reporting priority of the first group is higher than the reporting priority of the second group, and the reporting priority of the second group is higher than the reporting priority of the third group. Exemplarily, when the second field is the Part II field, since the Part II field is divided into three groups, Group 0, Group 1 and Group 2 in 3GPP TS 38.214, the first group can be Group 0, the second group can be Group 1, and the third group can be Group 2.

In an embodiment of the present application, the first bitmap may be carried in the first group or the second group. In this case, the first bitmap may be carried in Group 0 or Group 1.

In one possible implementation, the second bitmap may be carried in the second group and the third group, that is, the second bitmap may be carried in the second group and the third group in groups. In this case, the second bitmap may be carried in Group 1 and Group 2. In another possible implementation, the second bitmap may not be carried in the second group and the third group in groups, but only in the second group or the third group, that is, the second bitmap may be carried in Group 1 or Group 2. The embodiments of the present application do not specifically limit this.

It should be noted that, in the embodiment of the present application, the reporting or sending priority of the three groups of Group 0, Group 1 and Group 2 is reduced in sequence. For example, when the uplink and downlink transmission resources allocated by the network device are limited, for the Part II field, the terminal device will give priority to Group 0, followed by Group 1, and finally Group 2. At present, in the prior art, the bitmap of the first weighting coefficient is divided into two groups according to the priority of reporting the first weighting coefficient predefined by the protocol, and the two groups are carried in Group 1 and Group 2 for reporting. In the embodiment of the present application, since the second bitmap needs to be determined according to the first bitmap, if the first bitmap is also divided into two groups for reporting, when the uplink transmission resources are limited and only the first group of the first bitmap can be fed back, it will cause the first bitmap to be not fully fed back. In this case, the network device cannot know which first weighting coefficients are specifically selected by the reported bitmap, so the first bitmap is not suitable for group reporting and needs to be reported separately in Group 0 or Group 1. As for the second bitmap, it can be divided into two groups for reporting, and the two groups are respectively carried in Group 1 and Group 2. It can be understood that when the first bitmap is carried in Group 1, and the second bitmap is carried in Group 1 and Group 2 for reporting, or is only carried in Group 1 for reporting, in Group 1, the first bitmap is located before the second bitmap.

It is worth noting that the order of the first basis pairs indicated by each bit in the first bitmap can be The selected L spatial bases and the LA first basis pairs corresponding to the A first bases are arranged in an order predefined by the protocol, for example, L=8, M=6, Q=3, then the order of the 24 spatial-time domain basis pairs indicated by the 24 bits in the first bitmap is the order of the 24 spatial-time domain basis pairs arranged in an order predefined by the protocol. Then the network device can determine which spatial base and which first base the first basis pair indicated by each bit in the first bitmap corresponds to based on the determination of the L spatial bases and the A first bases. Similarly, the order of the first weighting coefficients indicated by each bit in the second bitmap can also be that the terminal device arranges the selected K first basis pairs and the KB first weighting coefficients corresponding to the B second bases in an order predefined by the protocol, and then the network device can determine which spatial base, which frequency domain base and which Doppler domain base the first weighting coefficient indicated by each bit corresponds to based on the selected K first base pairs and the B second bases. The specific implementation process can be referred to the relevant description in S203 below, which will not be repeated here.

S203. The network device determines a precoding matrix according to the first information.

In an embodiment of the present application, after receiving the CSI, the network device can restore the precoding matrix according to the values of the X first weighting coefficients carried in the CSI, the indices of the L spatial domain bases, the indices of the M frequency domain bases, the indices of the Q Doppler domain bases, and the first information. The precoding matrix is used to perform precoding processing on the downlink data.

Exemplarily, when the first basis is a Doppler domain basis and the second basis is a frequency domain basis, the network device can parse the CSI to obtain the first information, the values of the X first weighting coefficients, the indexes of the L spatial domain basis, the indexes of the M frequency domain basis, and the indexes of the Q Doppler domain basis, etc. Therefore, the network device can determine that K spatial-time domain basis pairs are selected from the LQ spatial-time domain basis pairs according to the first bitmap, and according to the positions of the selected K spatial-time domain basis pairs in the first bitmap, and the arrangement order of the spatial-time domain basis pairs obtained by combining the indexes of the L spatial domain basis and the indexes of the Q Doppler domain basis in the protocol pre-defined, it can determine the spatial domain basis and the frequency domain basis corresponding to the spatial-time domain basis pair indicated by the bit position with a bit value of 1 in the first bitmap, thereby determining the spatial domain basis and the frequency domain basis corresponding to the selected K spatial-time domain basis pairs. Furthermore, the network device determines that X first weighting coefficients are selected from KM first weighting coefficients according to the second bitmap, and according to the positions of the X first weighting coefficients in the second bitmap, and according to the arrangement order of the spatial domain basis, frequency domain basis and M frequency domain basis corresponding to the K space-time domain basis pairs in the predefined protocol, the spatial domain basis, frequency domain basis and Doppler domain basis corresponding to the first weighting coefficient indicated by the bit position with the bit value of 1 in the second bitmap value can be determined, thereby determining the spatial domain basis, frequency domain basis and Doppler domain basis corresponding to the X first weighting coefficients. Further, the network device can obtain a precoding matrix according to the X first weighting coefficients, L spatial domain basis, M frequency domain basis and Q Doppler domain basis, and perform precoding processing on the downlink data.

In the case where the first basis is a frequency domain basis and the second basis is a Doppler domain basis, the process of the network device determining the precoding matrix can refer to the above description and will not be repeated here.

Based on the channel parameter reporting method shown in FIG2, the terminal device uses the first bitmap to indicate the result of selecting the S first weighting coefficients from the two dimensions of the space-time domain or the space-frequency domain, and uses the second bitmap to indicate the X first weighting coefficients obtained after the first selection combined with the basis of the third dimension. The X first weighting coefficients selected from the S first weighting coefficients are indicated by a two-level bitmap, which can effectively reduce the bitmap overhead. For example, L = 8, M = 6, Q = 3, K = 8, the bitmap overhead of directly reporting the first weighting coefficient is S = LMQ = 144 bits, and the reporting overhead of the two-level bitmap provided by the embodiment of the present application is LQ + KM = 72 bits, saving 72 bits of bitmap overhead. For another example, L=8, M=6, Q=3, K=8, the bitmap overhead of directly reporting the first weighting coefficient is S=LMQ=144 bits, and the reporting overhead of the two-level bitmap provided in the embodiment of the present application is LM+KQ=72 bits, saving 72 bits of bitmap overhead.

Optionally, the terminal device may report in the above-mentioned manner, which may be predefined by the protocol or indicated by the network device to the terminal device. That is, the terminal device may be informed of the first basis and the second basis by predefined by the protocol or configured by the network device. Exemplarily, the network device sends fifth information to the terminal device, and the fifth information is used to indicate the first basis and/or the second basis. The fifth information may be carried in RRC signaling, MAC-CE signaling or DCI.

It can be understood that in the above embodiments, the methods and/or steps implemented by the terminal device can also be implemented by components that can be used for the terminal device (such as a processor, chip, chip system, circuit, logic module, or software); the methods and/or steps implemented by the network device can also be implemented by components that can be used for the network device (such as a processor, chip, chip system, circuit, logic module, or software).

The above mainly introduces the scheme provided by the present application. Accordingly, the present application also provides a communication device, which is used to implement various methods in the above method embodiments. The communication device can be a terminal device in the above method embodiments, or a device including a terminal device, or a component that can be used for a terminal device, such as a chip or a chip system. Alternatively, the communication device can be a network device in the above method embodiments, or a device including a network device, or a component that can be used for a network device, such as a chip or a chip system.

It is understandable that, in order to realize the above functions, the communication device includes hardware structures and/or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

The embodiment of the present application can divide the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

Taking the communication device as a terminal device or a network device in the above method embodiment as an example, FIG3 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. As shown in FIG3, the communication device 300 includes: a processing module 301 and a transceiver module 302. Among them, the processing module 301 is used to perform the processing function of the terminal device or the network device in the above method embodiment. The transceiver module 302 is used to perform the transceiver function of the terminal device or the network device in the above method embodiment.

Optionally, in the embodiment of the present application, the transceiver module 302 may include a receiving module and a sending module (not shown in FIG. 3 ). The transceiver module is used to implement the sending function and the receiving function of the communication device 300 .

Optionally, the communication device 300 may further include a storage module (not shown in FIG. 3 ), which stores a program or instruction. When the processing module 301 executes the program or instruction, the communication device 300 may perform the function of the terminal device or network device in the channel parameter reporting method shown in FIG. 2 .

It should be understood that the processing module 301 involved in the communication device 300 can be implemented by a processor or a processor-related circuit component, which can be a processor or a processing unit; the transceiver module 302 can be implemented by a transceiver or a transceiver-related circuit component, which can be a transceiver or a transceiver unit.

Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here.

Since the communication device 300 provided in this embodiment can execute the above-mentioned channel parameter reporting method, the technical effects that can be obtained can refer to the above-mentioned method embodiment, which will not be repeated here.

Exemplarily, FIG4 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application. The communication device may be a terminal device or a network device, or may be a chip (system) or other parts or components that can be set in a terminal device or a network device. As shown in FIG4, a communication device 400 may include a processor 401. Optionally, the communication device 400 may also include a memory 402 and/or a transceiver 403. The processor 401 is coupled to the memory 402 and the transceiver 403, such as being connected via a communication bus.

The following is a detailed introduction to the various components of the communication device 400 in conjunction with FIG. 4 :

The processor 401 is the control center of the communication device 400, which can be a processor or a general term for multiple processing elements. For example, the processor 401 is one or more central processing units (CPUs), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, such as one or more microprocessors (digital signal processors, DSPs), or one or more field programmable gate arrays (field programmable gate arrays, FPGAs).

Optionally, the processor 401 may perform various functions of the communication device 400 by running or executing a software program stored in the memory 402 , and calling data stored in the memory 402 .

In a specific implementation, as an embodiment, the processor 401 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 4 .

In a specific implementation, as an embodiment, the communication device 400 may also include multiple processors, such as the processor 401 and the processor 404 shown in FIG4. Each of these processors may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The processor here may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The memory 402 is used to store the software program for executing the solution of the present application, and the execution is controlled by the processor 401. The specific implementation method can refer to the above method embodiment, which will not be repeated here.

Optionally, the memory 402 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 402 may be integrated with the processor 401, or may exist independently and be coupled to the processor 401 through an interface circuit (not shown in FIG. 4 ) of the communication device 400, which is not specifically limited in the embodiments of the present application.

The transceiver 403 is used for communication with other communication devices. For example, if the communication device 400 is a terminal device, the transceiver 403 can be used to communicate with a network device, or with another terminal device. For another example, if the communication device 400 is a network device, the transceiver 403 can be used to communicate with a terminal device, or with another network device.

Optionally, the transceiver 403 may include a receiver and a transmitter (not shown separately in FIG. 4 ), wherein the receiver is used to implement a receiving function, and the transmitter is used to implement a sending function.

Optionally, the transceiver 403 may be integrated with the processor 401, or may exist independently and be coupled to the processor 401 via an interface circuit (not shown in FIG. 4 ) of the communication device 400, which is not specifically limited in the embodiment of the present application.

It should be noted that the structure of the communication device 400 shown in FIG. 4 does not constitute a limitation on the communication device, and an actual communication device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

In addition, the technical effects of the communication device 400 can refer to the technical effects of the channel parameter reporting method described in the above method embodiment, which will not be repeated here.

The embodiment of the present application provides a communication system. The communication system includes the above-mentioned terminal device and network device.

The embodiment of the present application also provides a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a computer, the functions of the above method embodiment are realized.

The embodiment of the present application also provides a computer program product, which implements the functions of the above method embodiment when executed by a computer.

It should be understood that the term "and/or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and/or" relationship. Please refer to the context for specific understanding.

In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple.

It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

Those skilled in the art will clearly understand that for the convenience and brevity of description, the above described systems, devices and units are The specific working process of the element can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

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

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

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

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A channel parameter reporting method, characterized in that the method comprises:

The terminal device determines first information, where the first information is used to indicate X first weighting coefficients selected by the terminal device from S first weighting coefficients in a first codebook, where the first codebook includes L spatial basis, M frequency domain basis, Q Doppler domain basis and the S first weighting coefficients, and the first information includes a first bitmap and a second bitmap, wherein the first bitmap is used to indicate K first basis pairs selected from L×A first basis pairs, where the L×A first basis pairs correspond to the L spatial basis and the A first basis, and the L×A first basis pairs in the Each first basis pair and B second basis correspond to B first weighting coefficients, the first basis is the frequency domain basis or the Doppler domain basis, the second basis is the frequency domain basis or the Doppler domain basis, the first basis is different from the second basis, the second bitmap is used to indicate the X first weighting coefficients selected from K×B first weighting coefficients, the K×B first weighting coefficients correspond to the K first basis pairs and the B second basis, S, X, L, M, Q, A, K, B are positive integers, S=L×M×Q, 1≤X≤K×B≤S;

The terminal device sends channel state information CSI to the network device, where the CSI includes the first information.
The method according to claim 1 is characterized in that the length of the first bit map is L×A bits, and the length of the second bit map is K×B bits.
The method according to claim 1 or 2 is characterized in that the CSI includes a first field, the first field carries second information, and the second information is used to indicate the K.
The method according to claim 3, characterized in that the method further comprises:

The terminal device receives third information from the network device, where the third information is used to indicate that the maximum value of K is K max , K≤K max , and K max is a positive integer.
The method according to claim 1 or 2, characterized in that the method further comprises:

The terminal device receives fourth information from the network device, where the fourth information is used to indicate the K.
The method according to claim 5 is characterized in that the fourth information is carried in any one of the following signaling: media access control-control unit MAC-CE signaling, radio resource control RRC signaling or downlink control information DCI signaling.
The method according to any one of claims 1-6 is characterized in that the CSI includes a second field, and the second field is used to indicate a first group, a second group, and a third group; wherein the first bit map is carried in the first group or the second group; and the second bit map is carried in at least one of the second group and the third group.
The method according to claim 7 is characterized in that the first group is Group 0, the second group is Group 1, and the third group is Group 2.
The method according to any one of claims 1-8 is characterized in that the K first basis pairs correspond to K second weighting coefficients, the K second weighting coefficients are the weighting coefficients ranked first K in descending order of amplitude among the L×A third weighting coefficients, and each of the L×A third weighting coefficients is obtained by adding the amplitudes or the squares of the amplitudes of B first weighting coefficients corresponding to each first basis pair in the L×A first basis pairs and the B second basis.
A channel parameter reporting method, characterized in that the method comprises:

The network device receives channel state information CSI from the terminal device, the CSI including first information, the first information being used to indicate X first weighting coefficients among S first weighting coefficients in a first codebook, the first codebook including L spatial domain bases, M frequency domain bases, Q Doppler domain bases, and the S first weighting coefficients, the first information including a first bitmap and a second bitmap, wherein the first bitmap is used to indicate K first basis pairs among L×A first basis pairs, the L×A first basis pairs corresponding to the L spatial domain bases and the A first bases, and the L×A Each first basis pair in the first basis pairs and the B second basis correspond to B first weighting coefficients, the first basis is the frequency domain basis or the Doppler domain basis, the second basis is the frequency domain basis or the Doppler domain basis, the first basis is different from the second basis, the second bitmap is used to indicate the X first weighting coefficients in K×B first weighting coefficients, the K×B first weighting coefficients correspond to the K first basis pairs and the B second basis, S, X, L, M, Q, A, K, B are positive integers, S=L×M×Q, 1≤X≤K×B≤S;

The network device determines a precoding matrix according to the first information.
The method according to claim 10 is characterized in that the length of the first bit map is L×A bits, and the length of the second bit map is K×B bits.
The method according to claim 10 or 11 is characterized in that the CSI includes a first field, the first field carries second information, and the second information is used to indicate the K.
The method according to claim 12, characterized in that the method further comprises:

The network device sends third information to the terminal device, where the third information is used to indicate that a maximum value of K is K max , K≤K max , and K max is a positive integer.
The method according to claim 10 or 11, characterized in that the method further comprises:

The network device sends fourth information to the terminal device, where the fourth information is used to indicate the K.
The method according to claim 14 is characterized in that the fourth information is carried in any one of the following signaling: media access control-control unit MAC-CE signaling, radio resource control RRC signaling or downlink control information DCI signaling.
The method according to any one of claims 10-15 is characterized in that the CSI includes a second field, and the second field is used to indicate a first group, a second group, and a third group; wherein the first bit map is carried in the first group or the second group, and the second bit map is carried in at least one of the second group and the third group.
The method according to claim 16 is characterized in that the first group is Group 0, the second group is Group 1, and the third group is Group 2.
The method according to any one of claims 10-17 is characterized in that the K first basis pairs correspond to K second weighting coefficients, the K second weighting coefficients are the weighting coefficients ranked first K in descending order of amplitude among the L×A third weighting coefficients, and each of the L×A third weighting coefficients is obtained by adding the amplitudes or the squares of the amplitudes of B first weighting coefficients corresponding to each first basis pair in the L×A first basis pairs and the B second basis.
A communication device, characterized in that the device comprises: a processing module and a transceiver module; wherein,

The processing module is used to determine the first information, wherein the first information is used to indicate the X first weighting coefficients selected by the terminal device from the S first weighting coefficients in the first codebook, the first codebook includes L spatial basis, M frequency domain basis, Q Doppler domain basis and the S first weighting coefficients, the first information includes a first bitmap and a second bitmap, wherein the first bitmap is used to indicate K first basis pairs selected from L×A first basis pairs, the L×A first basis pairs correspond to the L spatial basis and the A first basis, and the L×A first basis pairs Each first basis pair and B second basis in corresponds to B first weighting coefficients, the first basis is the frequency domain basis or the Doppler domain basis, the second basis is the frequency domain basis or the Doppler domain basis, the first basis is different from the second basis, the second bitmap is used to indicate the X first weighting coefficients selected from K×B first weighting coefficients, the K×B first weighting coefficients correspond to the K first basis pairs and the B second basis, S, X, L, M, Q, A, K, B are positive integers, S=L×M×Q, 1≤X≤K×B≤S;

The transceiver module is used to send channel state information CSI to the network device, where the CSI includes the first information.
The device according to claim 19 is characterized in that the length of the first bit map is L×A bits, and the length of the second bit map is K×B bits.
The device according to claim 19 or 20 is characterized in that the CSI includes a first field, the first field carries second information, and the second information is used to indicate the K.
The device according to claim 21 is characterized in that the transceiver module is further used to receive third information from the network device, and the third information is used to indicate that the maximum value of K is K max , K≤K max , and K max is a positive integer.
The device according to claim 19 or 20 is characterized in that the transceiver module is also used to receive fourth information from the network device, and the fourth information is used to indicate the K.
The device according to claim 23 is characterized in that the fourth information is carried in any one of the following signaling: media access control-control unit MAC-CE signaling, radio resource control RRC signaling or downlink control information DCI signaling.
The device according to any one of claims 19-24 is characterized in that the CSI includes a second field, and the second field is used to indicate a first group, a second group, and a third group; wherein the first bit map is carried in the first group or the second group; and the second bit map is carried in at least one of the second group and the third group.
The device according to claim 25 is characterized in that the first group is Group 0, the second group is Group 1, and the third group is Group 2.
The device according to any one of claims 19-26 is characterized in that the K first basis pairs correspond to K second weighting coefficients, the K second weighting coefficients are the weighting coefficients ranked first K in descending order of amplitude among the L×A third weighting coefficients, and each of the L×A third weighting coefficients is obtained by adding the amplitudes or the squares of the amplitudes of B first weighting coefficients corresponding to each first basis pair in the L×A first basis pairs and the B second basis.
A communication device, characterized in that the device comprises: a processing module and a transceiver module; wherein,

The transceiver module is used to receive channel state information CSI from a terminal device, the CSI includes first information, the first information is used to indicate X first weighting coefficients among S first weighting coefficients in a first codebook, the first codebook includes L spatial basis, M frequency domain basis, Q Doppler domain basis and the S first weighting coefficients, the first information includes a first bit map and a second bit map, wherein the first bit map is used to indicate K first basis pairs among L×A first basis pairs, the L×A first basis pairs correspond to the L spatial basis and the A first basis, and the L Each first basis pair of ×A first basis pairs and B second basis correspond to B first weighting coefficients, the first basis is the frequency domain basis or the Doppler domain basis, the second basis is the frequency domain basis or the Doppler domain basis, the first basis is different from the second basis, the second bitmap is used to indicate the X first weighting coefficients of K×B first weighting coefficients, the K×B first weighting coefficients correspond to the K first basis pairs and the B second basis, S, X, L, M, Q, A, K, B are positive integers, S=L×M×Q, 1≤X≤K×B≤S;

The processing module is used to determine a precoding matrix according to the first information.
The device according to claim 28 is characterized in that the length of the first bit map is L×A bits, and the length of the second bit map is K×B bits.
The device according to claim 28 or 29 is characterized in that the CSI includes a first field, the first field carries second information, and the second information is used to indicate the K.
The device according to claim 30 is characterized in that the transceiver module is further used to send third information to the terminal device, and the third information is used to indicate that the maximum value of K is K max , K≤K max , and K max is a positive integer.
The device according to claim 28 or 29 is characterized in that the transceiver module is also used to send fourth information to the terminal device, and the fourth information is used to indicate the K.
The device according to claim 32 is characterized in that the fourth information is carried in any one of the following signaling: media access control-control unit MAC-CE signaling, radio resource control RRC signaling or downlink control information DCI signaling.
The device according to any one of claims 28-33 is characterized in that the CSI includes a second field, and the second field is used to indicate a first group, a second group, and a third group; wherein the first bit map is carried in the first group or the second group, and the second bit map is carried in at least one of the second group and the third group.
The device according to claim 34 is characterized in that the first group is Group 0, the second group is Group 1, and the third group is Group 2.
The device according to any one of claims 28-35 is characterized in that the K first basis pairs correspond to K second weighting coefficients, the K second weighting coefficients are the weighting coefficients ranked first K in descending order of amplitude among the L×A third weighting coefficients, and each of the L×A third weighting coefficients is obtained by adding the amplitudes or the squares of the amplitudes of B first weighting coefficients corresponding to each first basis pair in the L×A first basis pairs and the B second basis.
A communication device, characterized by comprising: a processor, wherein the processor is coupled to a memory;

The memory is used to store computer programs;

The processor is configured to execute the computer program stored in the memory, so that the communication device executes the method according to any one of claims 1 to 18.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program or instruction, and when the computer program or instruction is executed on a computer, the computer executes the method as described in any one of claims 1 to 18.
A computer program product, characterized in that the computer program product comprises: a computer program or instructions, which, when executed on a computer, causes the computer to execute the method as described in any one of claims 1 to 18.
A chip system, characterized in that it comprises: at least one processor and an interface, wherein the at least one processor is coupled to a memory via the interface, and when the at least one processor executes a computer program or instruction in the memory, the method described in any one of claims 1 to 18 is executed.