Communication method, terminal, network device, communication system and storage medium

Abstract

A communication method, a terminal, a network device, a communication system and a storage medium, the method comprising: a terminal determining a first codeword in a first codebook, the first codebook being obtained based on an angle parameter set and a distance parameter set, the first codebook being a codebook used by the terminal in a near field area of a first antenna array; and the terminal sends first information to the network device, wherein the first information is used for indicating the first code word. According to the invention, the first code word determined by the terminal can be more matched with the wireless propagation characteristic of the near-field region, so that the transmission performance of the near-field region can be improved.

Description

Communication method, terminal, network device, communication system and storage medium Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular to a communication method, a terminal, a network device, a communication system, and a storage medium. Background Art

[0002] Multiple-Input Multiple-Output (MIMO) technology effectively improves system capacity and throughput by introducing multiple antennas. On the one hand, continuously increasing the number of antennas will further improve system performance. On the other hand, the introduction of higher frequency bands will lead to greater path loss, and more antennas can provide greater beamforming gain.

[0003] Summary of the Invention

[0004] The embodiments of the present disclosure provide a communication method, a terminal, a network device, a communication system, and a storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, a communication method is provided, the method comprising:

[0006] The terminal determines a first codeword in a first codebook, where the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used by the terminal in a near-field area of ​​the first antenna array;

[0007] The terminal sends first information to the network device, where the first information is used to indicate the first codeword.

[0008] According to a second aspect of an embodiment of the present disclosure, a communication method is provided, the method comprising:

[0009] The network device receives first information sent by the terminal, where the first information is used to indicate a first codeword, where the first codeword is a codeword in a first codebook, where the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used when the terminal is in a near-field area of ​​the first antenna array.

[0010] According to a third aspect of an embodiment of the present disclosure, a terminal is provided, comprising:

[0011] a processing module, configured to determine a first codeword in a first codebook, where the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used when the terminal is in a near-field area of ​​the first antenna array;

[0012] The transceiver module is used to send first information to the network device, where the first information is used to indicate the first codeword.

[0013] According to a fourth aspect of an embodiment of the present disclosure, a network device is provided, comprising:

[0014] A transceiver module, configured to receive first information sent by a terminal, where the first information is used to indicate a first codeword, where the first codeword is a codeword in a first codebook, where the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used by the terminal in a near-field area of ​​the first antenna array.

[0015] According to a fifth aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0016] one or more processors;

[0017] A memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, causes the terminal to execute the communication method described in the first aspect.

[0018] According to a sixth aspect of an embodiment of the present disclosure, a network device is provided, including:

[0019] one or more processors;

[0020] A memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, causes the network device to execute the communication method described in the second aspect.

[0021] According to the seventh aspect of an embodiment of the present disclosure, a communication system is proposed, comprising a terminal and a network device, wherein the terminal is configured to implement the communication method described in the first aspect, and the network device is configured to implement the communication method described in the second aspect.

[0022] According to an eighth aspect of an embodiment of the present disclosure, a storage medium is proposed, which stores instructions. When the instructions are executed on a communication device, the communication device executes the communication method as described in the first aspect or the second aspect.

[0023] In the above embodiment, a first codebook for the near-field area can be constructed based on the angle parameter and the distance parameter, so that the first codeword determined by the terminal can better match the wireless propagation characteristics of the near-field area, thereby improving the transmission performance of the near-field area. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0025] FIG1A is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure.

[0026] FIG1B is an exemplary schematic diagram of a first antenna array provided according to an embodiment of the present disclosure.

[0027] FIG1C is an exemplary schematic diagram of a first antenna array provided according to an embodiment of the present disclosure.

[0028] FIG2A is a schematic diagram of an exemplary interaction of a communication method provided according to an embodiment of the present disclosure.

[0029] FIG2B is an exemplary schematic diagram of rectangular quantization provided according to an embodiment of the present disclosure.

[0030] FIG2C is an exemplary schematic diagram of hexagonal quantization provided according to an embodiment of the present disclosure.

[0031] FIG3A is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0032] FIG3B is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0033] FIG4A is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0034] FIG4B is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0035] FIG5 is an exemplary interaction diagram of a communication method provided according to an embodiment of the present disclosure.

[0036] FIG6 is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0037] FIG7A is a schematic diagram of an exemplary structure of a terminal provided according to an embodiment of the present disclosure.

[0038] FIG7B is a schematic diagram of an exemplary structure of a network device provided according to an embodiment of the present disclosure.

[0039] FIG8A is a schematic diagram of an exemplary structure of a communication device provided according to an embodiment of the present disclosure.

[0040] FIG8B is a schematic diagram of an exemplary structure of a communication device provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] In a first aspect, an embodiment of the present disclosure provides a communication method, the method comprising:

[0042] The terminal determines a first codeword in a first codebook, where the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used by the terminal in a near-field area of ​​the first antenna array;

[0043] The terminal sends first information to the network device, where the first information is used to indicate the first codeword.

[0044] In the above embodiment, a first codebook for the near-field area can be constructed based on the angle parameters and the distance parameters, so that the terminal can determine the corresponding first codeword when in the near-field area, and feedback the angle parameters and distance parameters corresponding to the first codeword to the network device through the first information, so that the first codeword determined by the terminal can better match the wireless propagation characteristics of the near-field area, thereby improving the transmission performance of the near-field area.

[0045] In combination with the first aspect, the first antenna array is any one of the following: a uniform linear array; a uniform planar array.

[0046] In the above embodiment, the first codebook can be applied to a uniform linear array or a uniform planar array antenna array, thereby enabling a terminal located in such an antenna array to achieve more reliable near-field transmission based on the first codebook.

[0047] In combination with some embodiments of the first aspect, in some embodiments, the first antenna array includes N1 antenna ports in the horizontal dimension and N2 antenna ports in the vertical dimension, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1.

[0048] In the above embodiment, the first codebook can be applied to an antenna array including an antenna port number greater than or equal to 1 in the horizontal dimension and the vertical dimension, thereby enabling a terminal located in such an antenna array to achieve more reliable near-field area transmission based on the first codebook.

[0049] In combination with some embodiments of the first aspect, in some embodiments, the angle parameter includes: at least one first angle parameter, where the first angle parameter is obtained by quantizing the horizontal dimension angle domain in the near-field area based on the number of antenna ports N1 in the horizontal dimension and the oversampling factor O1 of the horizontal dimension angle domain; and / or, at least one second angle parameter, where the second angle parameter is obtained by quantizing the vertical dimension angle domain in the near-field area based on the number of antenna ports N2 in the vertical dimension and the oversampling factor O2 of the vertical dimension angle domain;

[0050] The distance parameters include:

[0051] At least one first distance parameter, wherein the first distance parameter is obtained by quantizing the horizontal dimension distance domain in the near-field area based on the number of sampling points N3 in the horizontal dimension and the oversampling factor O3 of the horizontal dimension distance domain; and / or, at least one second distance parameter, wherein the second distance parameter is obtained by quantizing the vertical dimension distance domain in the near-field area based on the number of sampling points N4 in the vertical dimension and the oversampling factor O4 of the vertical dimension distance domain.

[0052] In the above embodiment, the angle domain and the distance domain of each dimension can be quantized based on the number of sampling points and the oversampling factor of the angle domain and the distance domain of each dimension, so as to obtain multiple discrete angle parameters and distance parameters, thereby effectively reducing the number of codewords in the first codebook.

[0053] In conjunction with some embodiments of the first aspect, in some embodiments, multiple first distance parameters are distributed in K first distance parameter subsets, and the quantization offsets of the first angle parameters corresponding to the first distance parameters distributed in different first distance parameter subsets are different; and / or,

[0054] The plurality of second distance parameters are distributed in K second distance parameter subsets, and the quantization offsets of the second angle parameters corresponding to the second distance parameters distributed in different second distance parameter subsets are different.

[0055] In the above embodiment, the distance parameter can be divided into at least one subset in the horizontal dimension and / or the vertical dimension, and the quantization offsets of the angle parameters corresponding to different subsets are different. This can make the area covered by each codeword in the first codebook in the polarization domain larger, and the number of codewords can be reduced while ensuring communication quality.

[0056] In conjunction with some embodiments of the first aspect, in some embodiments, the quantization offset of the first angle parameter corresponding to the first distance parameter in the first distance parameter subset indexed by k is The first distance parameter in the first distance parameter subset indexed by k corresponds to the first angle parameter And / or, the quantization offset of the second angle parameter corresponding to the second distance parameter in the second distance parameter subset indexed by k is The second distance parameter in the second distance parameter subset indexed by k corresponds to the second angle parameter Wherein, 0≤k≤K-1 and k is an integer.

[0057] In conjunction with some embodiments of the first aspect, in some embodiments, K=2, the first distance parameter And / or, the second distance parameter

[0058] In the above embodiment, K can be set to 2, so that the distance parameters can be "hexagonally quantized" in the horizontal dimension and / or the distance dimension, and the number of the first distance parameters can be reduced to and / or reduce the number of second distance parameters to

[0059] In combination with some embodiments of the first aspect, in some embodiments, the basis vector of the first codebook is the Kronecker product of the first basis vector in the horizontal dimension and the second basis vector in the vertical dimension; the n′1th element in the first basis vector v for: and / or, the n′2th element in the second basis vector u for: Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, and d x Denotes the horizontal antenna spacing of the first antenna array, D x Denotes the horizontal dimension length of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D z Represents the vertical dimension length of the first antenna array.

[0060] In the above embodiment, the first basis vectors corresponding to each first distance parameter and the second basis vectors corresponding to each second distance parameter can be accurately determined by the above formula, and the codewords in the first codebook can be constructed based on these basis vectors, which can effectively ensure the reliability of near-field transmission.

[0061] In conjunction with some embodiments of the first aspect, in some embodiments, N1=N3 and O1=O3, the n′1th element in the first basis vector v for: and / or, N2=N4 and O2=O4, the n′2th element in the second basis vector u for:

[0062] In combination with some embodiments of the first aspect, in some embodiments, multiple first angle parameters are distributed in K first angle parameter subsets, and the quantization offsets of the first distance parameters corresponding to the first angle parameters distributed in different first angle parameter subsets are different; and / or, multiple second angle parameters are distributed in K second angle parameter subsets, and the quantization offsets of the second distance parameters corresponding to the second angle parameters distributed in different second angle parameter subsets are different.

[0063] In the above embodiments, the angle parameter can be divided into at least one subset in the horizontal dimension and / or the vertical dimension, and the quantization offsets of the distance parameters corresponding to different subsets are made different, so that the area covered by each codeword in the polarization domain in the first codebook can be larger, and the number of codewords can be reduced while ensuring the communication quality.

[0064] Combined with some embodiments of the first aspect, in some embodiments, the quantization offset of the first distance parameter corresponding to the first angle parameter in the first angle parameter subset with index k is The first angle parameter in the first angle parameter subset with index k corresponds to the first distance parameter And / or, the quantization offset of the second distance parameter corresponding to the second angle parameter in the second angle parameter subset with index k is The second angle parameter in the second angle parameter subset with index k corresponds to the second distance parameter Where 0 < k ≤ K and k is an integer.

[0065] Combined with some embodiments of the first aspect, in some embodiments, K = 2, the first angle parameter And / or, the second angle parameter

[0066] Combined with some embodiments of the first aspect, in some embodiments, the n′1-th element in the first basis vector v is: And / or, the n′2-th element in the second basis vector u is: Where j is the imaginary unit, λ represents the wavelength of the wireless signal, d x represents the antenna spacing in the horizontal dimension of the first antenna array, D x represents the length of the first antenna array in the horizontal dimension, d z represents the antenna spacing in the vertical dimension of the first antenna array, D z represents the length of the first antenna array in the vertical dimension.

[0067] Combined with some embodiments of the first aspect, in some embodiments, N1 = N3 and O1 = O3, the n′1-th element in the first basis vector v is: And / or, N2 = N4 and O2 = O4, the n′2-th element in the second basis vector u is:

[0068] In combination with some embodiments of the first aspect, in some embodiments, the first information includes at least one of the following: a first indication field, the first indication field is used to indicate the first angle parameter corresponding to the first codeword; a second indication field, the second indication field is used to indicate the second angle parameter corresponding to the first codeword; a third indication field, the third indication field is used to indicate the first distance parameter corresponding to the first codeword; and a fourth indication field, the fourth indication field is used to indicate the second distance parameter corresponding to the first codeword.

[0069] In the above embodiment, the various parameters corresponding to the first codeword can be reported to the network device through the above indication fields, so that the network device can accurately obtain the first codeword determined by the terminal based on the first information and realize reliable near-field transmission based on the first codeword.

[0070] In conjunction with some embodiments of the first aspect, in some embodiments, the first indication field at least includes bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0071] In the above embodiment, the first codeword can be reported using a minimum number of bits, which can effectively reduce resource overhead.

[0072] In conjunction with some embodiments of the first aspect, in some embodiments, the first indication field at least includes bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0073] With reference to some embodiments of the first aspect, in some embodiments, the first codebook is used for single-polarization single-layer transmission; or,

[0074] The first codebook is used for dual-polarization multi-layer transmission, and the first codebook is constructed based on the angle parameter, the distance parameter, and the common phase coefficient.

[0075] In combination with some embodiments of the first aspect, in some embodiments, the method further includes: the terminal sending second information to the network device, where the second information is used to indicate a common phase coefficient corresponding to the first codeword.

[0076] In combination with some embodiments of the first aspect, in some embodiments, the common phase coefficient includes at least one of the following: binary phase shift keying (BPSK), quadrature phase shift keying (QPSK) and 8-phase shift keying (8-PSK).

[0077] In a second aspect, an embodiment of the present disclosure proposes a communication method, the method comprising: a network device receives first information sent by a terminal, the first information is used to indicate a first codeword, the first codeword is a codeword in a first codebook, the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used when the terminal is in a near-field area of ​​a first antenna array.

[0078] In combination with some embodiments of the second aspect, in some embodiments, the first antenna array is any one of the following: a uniform linear array; a uniform planar array.

[0079] In combination with some embodiments of the second aspect, in some embodiments, the first antenna array includes N1 antenna ports in the horizontal dimension and N2 antenna ports in the vertical dimension, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1.

[0080] In combination with some embodiments of the second aspect, in some embodiments, the angle parameter includes: at least one first angle parameter, where the first angle parameter is quantized in the horizontal dimension angle domain in the near-field area according to the number of antenna ports N1 in the horizontal dimension and the oversampling factor O1 of the horizontal dimension angle domain; and / or, at least one second angle parameter, where the second angle parameter is quantized in the vertical dimension angle domain in the near-field area according to the number of antenna ports N2 in the vertical dimension and the oversampling factor O2 of the vertical dimension angle domain;

[0081] The distance parameters include: at least one first distance parameter, which is obtained by quantizing the horizontal dimension distance domain in the near field area based on the number of sampling points N3 in the horizontal dimension and the oversampling factor O3 of the horizontal dimension distance domain; and / or, at least one second distance parameter, which is obtained by quantizing the vertical dimension distance domain in the near field area based on the number of sampling points N4 in the vertical dimension and the oversampling factor O4 of the vertical dimension distance domain.

[0082] In combination with some embodiments of the second aspect, in some embodiments, multiple first distance parameters are distributed in K first distance parameter subsets, and the quantization offsets of the first angle parameters corresponding to the first distance parameters distributed in different first distance parameter subsets are different; and / or, multiple second distance parameters are distributed in K second distance parameter subsets, and the quantization offsets of the second angle parameters corresponding to the second distance parameters distributed in different second distance parameter subsets are different.

[0083] In conjunction with some embodiments of the second aspect, in some embodiments, the quantization offset of the first angle parameter corresponding to the first distance parameter in the first distance parameter subset indexed by k is The first distance parameter in the first distance parameter subset indexed by k corresponds to the first angle parameter And / or, the quantization offset of the second angle parameter corresponding to the second distance parameter in the second distance parameter subset indexed by k is The second distance parameter in the second distance parameter subset indexed by k corresponds to the second angle parameter Wherein, 0≤k≤K-1 and k is an integer.

[0084] In conjunction with some embodiments of the second aspect, in some embodiments, K=2, the first distance parameter And / or, the second distance parameter

[0085] In conjunction with some embodiments of the second aspect, in some embodiments, the basis vector of the first codebook is the Kronecker product of the first basis vector in the horizontal dimension and the second basis vector in the vertical dimension; the n′1th element in the first basis vector v for: and / or, the n′2th element in the second basis vector u for: Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, and d x Denotes the horizontal antenna spacing of the first antenna array, D x Denotes the horizontal dimension length of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D z Represents the vertical dimension length of the first antenna array.

[0086] In conjunction with some embodiments of the second aspect, in some embodiments, N1=N3 and O1=O3, the n′1th element in the first basis vector v for: and / or, N2 = N4 and O2 = O4, the n'2-th element in the second basis vector u is:

[0087] Combined with some embodiments of the second aspect, in some embodiments, multiple said first angle parameters are distributed in K first angle parameter subsets, and the quantization offsets of the first distance parameters corresponding to the first angle parameters distributed in different said first angle parameter subsets are different; and / or,

[0088] Multiple said second angle parameters are distributed in K second angle parameter subsets, and the quantization offsets of the second distance parameters corresponding to the second angle parameters distributed in different said second angle parameter subsets are different.

[0089] Combined with some embodiments of the second aspect, in some embodiments, the quantization offset of the first distance parameter corresponding to the first angle parameter in the first angle parameter subset with index k is the first distance parameter corresponding to the first angle parameter in the first angle parameter subset with index k and / or, the quantization offset of the second distance parameter corresponding to the second angle parameter in the second angle parameter subset with index k is the second distance parameter corresponding to the second angle parameter in the second angle parameter subset with index k where 0 < k ≤ K and k is an integer.

[0090] Combined with some embodiments of the second aspect, in some embodiments, K = 2, the first angle parameter and / or, the second angle parameter

[0091] Combined with some embodiments of the second aspect, in some embodiments, the n'1-th element in the first basis vector v is: and / or, the n'2-th element in the second basis vector u is:

[0092] where j is the imaginary unit, λ represents the wavelength of the wireless signal, d x represents the antenna spacing in the horizontal dimension of the first antenna array, D x represents the length in the horizontal dimension of the first antenna array, d z represents the antenna spacing in the vertical dimension of the first antenna array, D z represents the length in the vertical dimension of the first antenna array.

[0093] Combined with some embodiments of the second aspect, in some embodiments, N1=N3 and O1=O3, the n′1th element in the first basis vector v for: and / or, N2=N4 and O2=O4, the n′2th element in the second basis vector u for:

[0094] In conjunction with some embodiments of the second aspect, in some embodiments, the first information includes at least one of the following:

[0095] A first indication field, where the first indication field is used to indicate a first angle parameter corresponding to the first codeword; a second indication field, where the second indication field is used to indicate a second angle parameter corresponding to the first codeword; a third indication field, where the third indication field is used to indicate a first distance parameter corresponding to the first codeword; and a fourth indication field, where the fourth indication field is used to indicate a second distance parameter corresponding to the first codeword.

[0096] In conjunction with some embodiments of the second aspect, in some embodiments, the first indication field at least includes bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0097] In conjunction with some embodiments of the second aspect, in some embodiments, the first indication field at least includes bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0098] In combination with some embodiments of the second aspect, in some embodiments, the first codebook is used for single-polarization single-layer transmission; or, the first codebook is used for dual-polarization multi-layer transmission, and the first codebook is constructed based on the angle parameter, the distance parameter, and the common phase coefficient.

[0099] In combination with some embodiments of the second aspect, in some embodiments, the method further includes: the network device receives second information sent by the terminal, where the second information is used to indicate a common phase coefficient corresponding to the first codeword.

[0100] In combination with some embodiments of the second aspect, in some embodiments, the common phase coefficient includes at least one of the following: binary phase shift keying BPSK, quadrature phase shift keying QPSK and eight-phase phase shift keying 8-PSK.

[0101] In a third aspect, an embodiment of the present disclosure provides a terminal, comprising:

[0102] a processing module, configured to determine a first codeword in a first codebook, where the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used when the terminal is in a near-field area of ​​the first antenna array;

[0103] The transceiver module is used to send first information to the network device, where the first information is used to indicate the first codeword.

[0104] In a fourth aspect, an embodiment of the present disclosure provides a network device, comprising:

[0105] A transceiver module, configured to receive first information sent by a terminal, where the first information is used to indicate a first codeword, where the first codeword is a codeword in a first codebook, where the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used by the terminal in a near-field area of ​​the first antenna array.

[0106] In a fifth aspect, an embodiment of the present disclosure proposes a terminal comprising: one or more processors; a memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, enables the terminal to execute the communication method in the first aspect.

[0107] In the sixth aspect, an embodiment of the present disclosure proposes a network device, comprising: one or more processors; a memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, enables the network device to execute the communication method in the second aspect.

[0108] In the seventh aspect, an embodiment of the present disclosure proposes a communication system, which includes: a terminal and a network device; wherein the terminal is configured to execute the method described in the optional implementation manner of the first aspect, and the network device is configured to execute the method described in the optional implementation manner of the second aspect.

[0109] In an eighth aspect, an embodiment of the present disclosure proposes a storage medium, wherein the storage medium stores instructions. When the instructions are executed on a communication device, the communication device executes the method described in the optional implementation of the first and second aspects.

[0110] In a ninth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the optional implementation of the first and second aspects.

[0111] In a tenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first and second aspects.

[0112] In an eleventh aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first and second aspects above.

[0113] It is understandable that the above-mentioned terminals, network devices, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to perform the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0114] The present disclosure provides a communication method, terminal, network device, communication system, and storage medium. In some embodiments, the terms "communication method" and "codebook determination method" and "codeword reporting method" are interchangeable; the terms "communication device" and "codebook determination device" and "codeword reporting device" are interchangeable; and the terms "information processing system" and "communication system" are interchangeable.

[0115] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0116] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0117] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0118] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0119] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0120] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0121] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0122] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0123] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0124] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0125] In some embodiments, terms such as "time / frequency" and "time / frequency domain" refer to the time domain and / or the frequency domain.

[0126] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0127] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0128] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0129] In some embodiments, "network" can be interpreted as devices included in the network (eg, access network equipment, core network equipment, etc.).

[0130] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station" "fixed station", "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)" and the like may be used interchangeably.

[0131] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0132] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set the structure in which the terminal has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0133] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal.

[0134] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0135] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0136] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0137] FIG1A is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure (a system diagram including only the subjects related to the invention point and their important opposite sides, and the number of subjects corresponds to the number of subjects involved in the invention point).

[0138] As shown in Figure 1A, a communication system 100 includes a terminal 101 and a network device 102. In some embodiments, the network device 102 may include at least one of an access network device and a core network device.

[0139] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0140] In some embodiments, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0141] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0142] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0143] In some embodiments, the core network device may be a single device including a first network element, a second network element, etc., or may be a plurality of devices or a group of devices, each including all or part of the first network element, the second network element, etc. The network element may be virtual or physical. The core network may include, for example, at least one of an evolved packet core (EPC), a 5G core network (5GCN), and a next generation core (NGC).

[0144] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0145] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1A , or a portion thereof, but are not limited thereto. The entities shown in FIG1A are illustrative only. The communication system may include all or part of the entities shown in FIG1A , or may include other entities other than those shown in FIG1A . The number and form of the entities may be arbitrary, and the entities may be physical or virtual. The connection relationships between the entities are illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0146] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0147] In some embodiments, network device 102 may be a network device in an extremely large-scale multiple input multiple output (XL-MIMO) system. Network device 102 may include a first antenna array, which may be used to transmit wireless signals from the network device to a terminal. Optionally, the type of the first antenna array may include, but is not limited to, a uniform linear array or a uniform planar array.

[0148] In some embodiments, the radiation range of the antenna array can be divided into a near-field region and a far-field region, the boundaries of which can be represented by a Rayleigh distance, and the Rayleigh distance is proportional to the antenna aperture and carrier frequency of the antenna array.

[0149] FIG1B is a schematic diagram of a first antenna array according to an exemplary embodiment. As shown in FIG1B , the first antenna array can be modeled on the x-axis of a two-dimensional Cartesian coordinate system, including 7 antenna ports in the horizontal dimension, and the spacing between the 7 antenna ports is the same, that is, the first antenna array is a uniform linear array with N1 equal to 7 and N2 equal to 1, and the spacing between each antenna port can be d x Taking the antenna port with the horizontal dimension index of 0 in the first antenna array as the origin (0, 0), the coordinates of the antenna port with the horizontal dimension index of n1 can be (n1d x ,0), where n1 is an integer and satisfies n1∈{-(N1-1) / 2,…,0,…(N1-1) / 2}. The horizontal dimension length of the antenna array is D x , which can be expressed as D x =N1d x or D x =(N1-1)d x .

[0150] If a terminal is located in the xy plane of the two-dimensional Cartesian coordinate system, the distance between the terminal and the origin is r, and the angle between the terminal and the positive direction of the x-axis is θ, and 0≤θ≤π. In this example, the equivalent antenna aperture in the horizontal dimension of the antenna array is When the terminal is located in the xy two-dimensional plane, the Rayleigh distance can be calculated as In this way, when the distance between the terminal and the first antenna array is less than or equal to the Rayleigh distance, it can be determined that the terminal is located in the near field area; otherwise, it can be determined that the terminal is in the far field area.

[0151] The distance between the antenna port indexed as n1 in the first antenna array and the terminal can be calculated as: According to Taylor's formula, the above formula is approximated by a second-order Taylor expansion. Therefore, the distance between the antenna with index n1 in the antenna array and the UE can be approximately calculated as:

[0152] The single-polarization array response vector of the first antenna array can be calculated as:

[0153] FIG1C is a schematic diagram of a first antenna array according to an exemplary embodiment. As shown in FIG1C , the first antenna array can be modeled on the xy plane of a three-dimensional Cartesian coordinate system. The antenna array has 21 antenna ports, wherein the number of antenna ports in the horizontal dimension is 7 and the number of antenna ports in the vertical dimension is 3. The spacing between the antenna ports in their respective dimensions is the same, that is, the first antenna array is a uniform array with N1 equal to 7 and N2 equal to 3, wherein the spacing between the antenna ports in the horizontal dimension can be d x , the vertical spacing between antenna ports can be d z Taking the antenna port with the horizontal and vertical indexes of 0 in the first antenna array as the origin (0, 0, 0), the coordinates of the antenna with the horizontal and vertical indexes (n1, n2) in the antenna array are (n1d x ,0,n2d z ), where n1 and n2 are integers and satisfy n1∈{-(N1-1) / 2,…,0,…(N1-1) / 2} and n2∈{-(N2-1) / 2,…,0,…(N2-1) / 2}.

[0154] If a terminal is located in the xyz space of the three-dimensional Cartesian coordinate system, the distance between the terminal and the origin is r, the angle between the terminal and the positive direction of the x-axis is θ and 0≤θ≤π, and the angle between the terminal and the positive direction of the z-axis is and According to the geometric relationship, we can get In this example, the equivalent antenna aperture in the horizontal dimension of the antenna array is The equivalent antenna aperture in the vertical dimension is When the terminal is located in the xyz three-dimensional space, the horizontal dimension Rayleigh distance can be calculated as The Rayleigh distance in the vertical dimension can be calculated as In this way, when the distance between the terminal and the first antenna array in the horizontal dimension and / or the vertical dimension is less than or equal to the Rayleigh distance, it can be determined that the terminal is located in the near field area.

[0155] The distance between the antenna port indexed by (n1, n2) in the first antenna array and the terminal can be calculated as: According to Taylor's formula, the above formula is approximated by a second-order Taylor expansion. Therefore, the distance between the antenna indexed (n1, n2) in the antenna array and the terminal can be approximately calculated as:

[0156] The single-polarization array response vector of the first antenna array can be calculated as:

[0157] In some embodiments, only the far-field region is considered, and the channel model and codebook design are both tailored to far-field MIMO. However, with the substantial increase in antenna array size and frequency band, the Rayleigh distance increases to a certain extent, making it easier for terminals in the communication system to enter the near-field region of the antenna array. In the near-field region, electromagnetic waves propagate as spherical waves, while in the far-field region, electromagnetic waves propagate as plane waves. Therefore, codebook designs designed for the far-field region cannot guarantee the quality of communication in the near-field region.

[0158] It is worth noting that the first antenna arrays shown in Figures 1B and 1C are exemplary only. The number of antenna ports in the first antenna array may be smaller or larger than that shown in Figures 1B or 1C, and this is not limited in the present disclosure. For example, the first antenna array may have 64 ports in both the horizontal and vertical dimensions.

[0159] FIG2A is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG2A , the embodiment of the present disclosure relates to a communication method, and the method includes:

[0160] Step S2101: The terminal determines a first codeword in a first codebook.

[0161] In some embodiments, the first codebook is a codebook used when the terminal is in a near-field area of ​​the first antenna array.

[0162] In some embodiments, the terminal determines a first codeword in a first codebook. Optionally, the terminal determines the first codeword in the first codebook based on a measurement result. Optionally, the terminal determines, based on the measurement result, that the terminal is in a near-field region of a first antenna array, and determines the first codeword in the first codebook.

[0163] For example, the terminal may first receive the CSI-RS sent by the network device, and perform channel estimation based on the CSI-RS to determine whether it is in the near-field area. The terminal may further traverse each codeword in the first codebook to obtain the optimal first codeword.

[0164] It is understood that the near-field region of the first antenna array may refer to a close distance between the terminal and the antenna array. For example, when the distance between the terminal and the antenna array in the horizontal dimension and / or the vertical dimension is less than or equal to the Rayleigh distance, the terminal may be determined to be in the near-field region of the first antenna array.

[0165] Optionally, the terminal determines that the distance from the first antenna array satisfies at least one of the following conditions, and determines that the terminal is in the near field area: and in,

[0166] In some embodiments, the first antenna array is an antenna array used by a network device to transmit wireless signals to a terminal. For example, the network device may precode data in a data stream based on codewords in a first codebook, so that the wireless signals transmitted by the network device can be accurately and reliably received by a terminal in a near-field area.

[0167] In some embodiments, the first codebook or the basis vectors of the first codebook are constructed based on the angle parameter set and the distance parameter set. Optionally, the terminal determines the angle parameter and the distance parameter corresponding to the first codeword in the first codebook.

[0168] Among them, the angle parameter set may include each angle of the near-field area of ​​the first antenna array in the angle domain or the index corresponding to each angle, the distance parameter set may include each distance of the near-field area of ​​the first antenna array in the distance domain or the index corresponding to each distance, and the first codebook may be a set of codewords corresponding to each angle and each distance, that is, the first codebook or the basis vector of the first codebook can be constructed according to the codewords corresponding to each angle and each distance.

[0169] Optionally, the first codebook includes multiple codewords corresponding to various angles and distances in the near-field region, or the basis vectors of the first codebook include basis vectors corresponding to various angles and distances in the near-field region. Optionally, each codeword in the first codebook corresponds to a different angle parameter and / or distance parameter. Optionally, at least one of the distance parameter and the angle parameter of any two codewords in the first codebook is different.

[0170] In some embodiments, the first antenna array may be any one of the following: a uniform linear array; a uniform planar array. Optionally, the first antenna array may also be a triangular array or a circular array, which is not limited in the present embodiment.

[0171] In some embodiments, the first antenna array includes N1 antenna ports in the horizontal dimension and N2 antenna ports in the vertical dimension, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1.

[0172] Among them, the uniform linear array can be regarded as a special uniform planar array, that is, the uniform linear array can be a uniform planar array with 1 antenna port in the horizontal dimension or the vertical dimension.

[0173] It can be understood that when N1 or N2 is equal to 1 and the spacing between the antenna ports is the same, the first antenna array can be a uniform linear array. When N1 and / or N2 is greater than 1 and the spacing between the antenna ports is the same, the first antenna array can be a uniform planar array. The spacing between the antenna ports in the horizontal dimension can be expressed as d x , the spacing in the vertical dimension can be expressed as d z , the horizontal dimension length of the antenna array can be expressed as D x , where D x =N1d x or D x =(N1-1)d x , or other representations, which are not limited in the present disclosure. The vertical dimension length of the antenna array can be expressed as D z , where D z =N2d z or D z =(N2-1)d z , or other representations are possible, which are not limited in the embodiments of the present disclosure.

[0174] In some embodiments, the angle parameters include at least one of the following: at least one first angle parameter, which is obtained by quantizing the horizontal dimension angle domain in the near-field area based on the number of antenna ports N1 in the horizontal dimension and the oversampling factor O1 of the horizontal dimension angle domain; at least one second angle parameter, which is obtained by quantizing the vertical dimension angle domain in the near-field area based on the number of antenna ports N2 in the vertical dimension and the oversampling factor O2 of the vertical dimension angle domain.

[0175] The first angle parameter can be the angle domain cosθ or The possible values ​​are quantified, where -1≤cosθ≤1. The second angle parameter can be the angle domain of the vertical dimension The first distance parameter can be the distance domain of the horizontal dimension (0, or ] is quantized to obtain the possible values, and the second distance parameter can be the distance domain of the horizontal dimension (0, ] is obtained by quantifying the possible values.

[0176] For example, when the first antenna array is a uniform linear array, the distance between the terminal and the first antenna array in the horizontal dimension, that is, the distance domain in the horizontal dimension, is less than or equal to Alternatively, when the first antenna array is a uniform linear array, the distance between the terminal and the first antenna array in the horizontal dimension is less than or equal to It can be determined that the terminal is in the near field area in the horizontal dimension; if the distance between the terminal and the first antenna array in the vertical dimension is less than or equal to It can be determined that the terminal is in the near field area in the vertical and horizontal dimensions.

[0177] It can be understood that when the first antenna array is a uniform linear array, the horizontal angle domain or the vertical angle domain may have a unique value. For example, the value of N1O1 may be greater than 1 and the value of N2O2 may be 1. At this time, the angle parameters may include N1O1 first angle parameters and one second angle parameter, and the value of the second angle parameter is zero.

[0178] In some embodiments, the basis vectors of the first codebook include first basis vectors in a horizontal dimension and second basis vectors in a vertical dimension.

[0179] Optionally, the basis vector of the first codebook may be the Kronecker product of the first basis vector and the second basis vector. For example, the basis vector of the first codebook may be expressed as

[0180] In some embodiments, the n′1th element of the first basis vector v for: The n′2th element of the second basis vector u for:

[0181] Where n′1=n1+(N1+1) / 2, n′2=n2+(N2+1) / 2, n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension; l represents the first angle parameter corresponding to the first basis vector, m represents the second angle parameter corresponding to the second basis vector, o1 represents the first distance angle parameter corresponding to the first basis vector, o2 represents the second distance parameter corresponding to the second basis vector, l=0,1,…,N1O1-1, m=0,1,…,N2O2-1, o1=1,2,…,N3O3, o2=1,2,…,N4O4; j is an imaginary unit, λ represents the wavelength of the wireless signal, d x Denotes the horizontal antenna spacing of the first antenna array, D x Denotes the horizontal dimension length of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D z Represents the vertical dimension length of the first antenna array.

[0182] In this embodiment, the quantization offsets of the first distance parameter, the second distance parameter, the first angle parameter, and the second angle parameter may all be the same, for example, the quantization offsets may all be zero.

[0183] It can be understood that the quantization method with the same quantization offset in the above embodiment can be called "rectangular quantization", that is, the polarization domain is quantized according to a rectangular area, that is, any codeword can be used to quantize the channel within its corresponding rectangular area, that is, the range covered by any precoding matrix is ​​rectangular.

[0184] In other embodiments, a range covered by a precoding matrix may be added, wherein different quantization offsets may be used for parameters belonging to different sets, for example, a "hexagonal quantization" scheme may be used.

[0185] Referring to Figures 2B and 2C , the circles in the figures represent quantization points, each of which corresponds to a precoding matrix or a codeword. Figure 2B employs "rectangular quantization," quantizing the polarization domain according to rectangular regions. This means any codeword can be used to quantize channels within its corresponding rectangular region, meaning any precoding matrix covers a rectangular area. Figure 2C employs "hexagonal quantization," meaning any precoding matrix covers a rectangular area.

[0186] For example, referring to FIG2B and FIG2C, assuming that the quantization interval of the distance domain in the “rectangular quantization” in FIG2B is 2d, the total number of quantization points is N3O3, and the quantization interval of the distance domain in the “hexagonal quantization” is The total number of quantized points is X, so we only need to ensure This means that when "hexagonal quantization" is used, the distance between any codeword and the center is the same as that of "rectangular quantization". In other words, in order to ensure that the performance of "hexagonal quantization" is better than or equal to that of "rectangular quantization", it is only necessary to In this way, the number of codewords in the first codebook can be effectively reduced.

[0187] It can be understood that the "hexagonal quantization" shown in Figure 2C can be achieved by dividing the first distance parameter into two groups and using different quantization offsets. In other optional embodiments, the first distance parameter or other parameters can also be divided into K groups, and different quantization offsets can be used to reduce the number of codewords in the first codebook while ensuring communication quality.

[0188] In this regard, in some embodiments, the plurality of first distance parameters are distributed in K first distance parameter subsets, and the quantization offsets of the first angle parameters corresponding to the first distance parameters distributed in different first distance parameter subsets are different.

[0189] The multiple first distance parameters may be uniformly distributed. For example, the number of first distance parameters in each first distance parameter subset is the same, and the values ​​of the first distance parameters in each first distance parameter subset may be an arithmetic progression.

[0190] In some embodiments, the quantization offset of the first angle parameter corresponding to the first distance parameter in the first distance parameter subset indexed by k is The first distance parameter in the first distance parameter subset indexed by k corresponds to the first angle parameter Wherein, 0≤k≤K-1 and k is an integer.

[0191] Optionally, K=2, the first distance parameter

[0192] For example, when K is 2, that is, the number of the first distance parameter subsets is 2, the value of the index k of the first distance parameter subset can be 0 or 1. When k is 0, the first distance parameter in the first distance parameter subset can be less than or equal to The quantization offset of the first angle parameter corresponding to the first distance parameter subset is 0. At this time, the first angle parameter corresponding to the first distance parameter subset is l∈{0,1,…,N1O1-1}; when k is 1, the first distance parameter in the first distance parameter subset can be less than or equal to The quantization offset of the first angle parameter corresponding to the first distance parameter subset is an even number. At this time, the first angle parameter corresponding to the first distance parameter subset is

[0193] In some embodiments, the n′1th element in the first basis vector v for:

[0194] Where j is the imaginary unit, λ represents the wavelength of the wireless signal, and d x Denotes the horizontal antenna spacing of the first antenna array, D x Denotes the horizontal dimension length of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D z Represents the vertical dimension length of the first antenna array.

[0195] In some embodiments, N1=N3 and O1=O3, the n′1th element in the first basis vector v for:

[0196] The number of first distance parameters in the first distance parameter set can be That is, the first codebook may include a first distance parameter less than or equal to The code words corresponding to the multiple first basis vectors.

[0197] Optionally, for an odd-numbered first distance parameter, the corresponding first angle parameter l∈{0,1,…,N1O1-1}, and for an even-numbered first distance parameter, the corresponding first angle parameter Or, for an even-numbered first distance parameter, the corresponding first angle parameter l∈{0,1,…,N1O1-1}; for an odd-numbered first distance parameter, the corresponding first angle parameter

[0198] For example, when N3=N1=64 and O3=O1=4, When o1∈{1,3,…,241} and o1 is an odd number, l∈{0,1,…,255}, when o1∈{2,4,…,242} and o1 is an even number, Or, when o1∈{2,4,…,242} and o1 is even, l∈{0,1,…,255}, when o1∈{1,3,…,241} and o1 is odd,

[0199] In some embodiments, the plurality of second distance parameters are distributed in K second distance parameter subsets, and the quantization offsets of the second angle parameters corresponding to the second distance parameters distributed in different second distance parameter subsets are different.

[0200] The multiple second distance parameters may be uniformly distributed. For example, the number of second distance parameters in each second distance parameter subset is the same, and the value of the second distance parameter in each second distance parameter subset may be an arithmetic progression.

[0201] In some embodiments, the quantization offset of the second angle parameter corresponding to the second distance parameter in the second distance parameter subset indexed by k is The second distance parameter in the second distance parameter subset indexed by k corresponds to the second angle parameter Wherein, 0≤k≤K-1 and k is an integer.

[0202] Optionally, K=2, the second distance parameter

[0203] For example, when K is 2, that is, the number of the second distance parameter subsets is 2, the value of the index k of the second distance parameter subset can be 0 or 1. When k is 0, the second distance parameter in the second distance parameter subset can be less than or equal to The quantization offset of the second angle parameter corresponding to the second distance parameter subset is 0. At this time, the second angle parameter m∈{0,1,…,N2O2-1} corresponding to the second distance parameter subset is 1. When k is 1, the second distance parameter in the second distance parameter subset can be less than or equal to The quantization offset of the second angle parameter corresponding to the second distance parameter subset is an even number. At this time, the second angle parameter corresponding to the second distance parameter subset is

[0204] In some embodiments, the n′2th element in the second basis vector u for:

[0205] Where j is the imaginary unit, λ represents the wavelength of the wireless signal, and d x Denotes the horizontal antenna spacing of the first antenna array, D x Denotes the horizontal dimension length of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D z Represents the vertical dimension length of the first antenna array.

[0206] In some embodiments, N2=N4 and O2=O4, the n′2th element in the second basis vector u for:

[0207] The number of the second distance parameters in the second distance parameter set can be That is, the first codebook may include a second distance parameter less than or equal to The code words corresponding to the multiple second basis vectors.

[0208] Optionally, for an odd-numbered second distance parameter, the corresponding second angle parameter m∈{0,1,…,N2O2-1}; for an even-numbered second distance parameter, the corresponding second angle parameter Alternatively, for an even-numbered second distance parameter, the corresponding second angle parameter m∈{0,1,…,N2O2-1}; for an odd-numbered second distance parameter, the corresponding second angle parameter

[0209] For example, when N4=N2=64 and O4=O2=4, When o2∈{1,3,…,241} and o2 is an odd number, m∈{0,1,…,255}, when o2∈{2,4,…,242} and o2 is an even number, Or, when o2∈{2,4,…,242} and o2 is even, m∈{0,1,…,255}, when o2∈{1,3,…,241} and o2 is odd,

[0210] In some embodiments, multiple first angle parameters are distributed among K first angle parameter subsets, and the quantization offsets of the first distance parameters corresponding to the first angle parameters in different first angle parameter subsets are different.

[0211] Among them, the multiple first angle parameters may be uniformly distributed. For example, the number of first angle parameters in each first angle parameter subset is the same, and the values of the first angle parameters in each first angle parameter subset may form an arithmetic progression.

[0212] In some embodiments, the quantization offset of the first distance parameter corresponding to the first angle parameter in the first angle parameter subset with index k is The first angle parameter in the first angle parameter subset with index k corresponds to the second angle parameter where 0 < k ≤ K and k is an integer.

[0213] Optionally, K = 2, the first angle parameter

[0214] Exemplarily, when K = 2, that is, the number of first angle parameter subsets is 2, the value of the index k of the first angle parameter subset can be 1 or 2. When k = 1, the first angle parameter in this first angle parameter subset can be an odd number less than or equal to and the quantization offset of the first distance parameter corresponding to this first angle parameter subset is 0. At this time, the first distance parameter o1 corresponding to this first angle parameter subset ∈ {1,..., N3O3 - 1}; when k = 2, the first angle parameter in this first angle parameter subset can be an even number less than or equal to and the quantization offset of the first distance parameter corresponding to this first angle parameter subset is At this time, the first distance parameter corresponding to this first angle parameter subset

[0215] In some embodiments, the n′1-th element in the first basis vector v is:

[0216] where j is the imaginary unit, λ represents the wavelength of the wireless signal, d x represents the antenna spacing in the horizontal dimension of the first antenna array, D x represents the length of the first antenna array in the horizontal dimension, d z represents the antenna spacing in the vertical dimension of the first antenna array, D z represents the length of the first antenna array in the vertical dimension.

[0217] In some embodiments, N1 = N3 and O1 = O3, the n′1-th element in the first basis vector v is:

[0218] Among them, the number of the first angle parameters in the first angle parameter set can be That is to say, the first codebook can include codewords corresponding to multiple first basis vectors whose first angle parameters are less than or equal to .

[0219] Optionally, for the first angle parameter that is odd, the corresponding first distance parameter o1 ∈ {1, …, N1O1 - 1}, and for the first angle parameter that is even, the corresponding second angle parameter Or, for the first angle parameter that is even, the corresponding second angle parameter o1 ∈ {1, …, N1O1 - 1}; for the first angle parameter that is odd, the corresponding second angle parameter

[0220] Exemplarily, when N3 = N1 = 64 and O3 = O1 = 4, at this time When l ∈ {1, 3, …, 241} and l is odd, o1 ∈ {1, …, 255}, and when l ∈ {2, 4, …, 242} and l is even, Or, when l ∈ {1, 3, …, 241} and l is even, o1 ∈ {1, …, 255}, and when l ∈ {2, 4, …, 242} and l is odd,

[0221] In some embodiments, multiple second angle parameters are distributed in K second angle parameter subsets, and the quantization offsets of the second distance parameters corresponding to the second angle parameters distributed in different second angle parameter subsets are different.

[0222] Among them, multiple second angle parameters can be evenly distributed. For example, the number of second angle parameters in each second angle parameter subset is the same, and the values of the second angle parameters in each second angle parameter subset can form an arithmetic sequence.

[0223] In some embodiments, the quantization offset of the second distance parameter corresponding to the second angle parameter in the second angle parameter subset with index k is The second angle parameter in the second angle parameter subset with index k corresponds to the second angle parameter Among them, 0 < k ≤ K and k is an integer.

[0224] Optionally, K = 2, the second angle parameter

[0225] For example, when K is 2, that is, the number of the second angle parameter subsets is 2, the value of the index k of the second angle parameter subset can be 1 or 2. When k is 1, the second angle parameter in the second angle parameter subset can be less than or equal to The quantization offset of the second distance parameter corresponding to the second angle parameter subset is 0. At this time, the second distance parameter o2∈{1,…,N4O4-1} corresponding to the second angle parameter subset is 0. When k is 2, the second angle parameter in the second angle parameter subset can be less than or equal to The quantization offset of the second distance parameter corresponding to the second angle parameter subset is At this time, the second distance parameter corresponding to the second angle parameter subset is

[0226] In some embodiments, the n′2th element in the second basis vector u for:

[0227] Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, and d x Denotes the horizontal antenna spacing of the first antenna array, D x Denotes the horizontal dimension length of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D z Represents the vertical dimension length of the first antenna array.

[0228] In some embodiments, N2=N4 and O2=O4, the n′2th element in the second basis vector u for:

[0229] The number of second angle parameters in the second angle parameter set can be That is, the second codebook may include a second angle parameter less than or equal to The code words corresponding to the multiple second basis vectors.

[0230] Optionally, for an odd-numbered second angle parameter, the corresponding second distance parameter o2∈{1,…,N2O2-1}, and for an even-numbered second angle parameter, the corresponding second distance parameter Alternatively, for an even-numbered second angle parameter, the corresponding second distance parameter o2∈{1,…,N2O2-1}; for an odd-numbered second angle parameter, the corresponding second distance parameter

[0231] For example, when N4=N2=64 and O4=O2=4, When m∈{1,3,…,241} and m is an odd number, o2∈{1,…,255}, when m∈{2,4,…,242} and m is an even number, Or, when m∈{1,3,…,241} and m is even, o2∈{1,…,255}, when m∈{2,4,…,242} and m is odd,

[0232] It is understood that while the first angle parameter can be divided into multiple first angle parameter sets, the second angle parameter can also be divided into multiple second angle parameter sets. The number of the multiple first angle parameter sets and the number of the multiple second angle parameter sets can be the same or different, and this is not limited in the present embodiment. In other words, the number K of the first angle distance parameter subsets and the number K of the second angle parameter subsets can be the same or different.

[0233] For example, if the number of the first angle parameter subset and the second angle parameter subset is the same and both are K, and the antenna spacing in the horizontal dimension and the vertical dimension of the antenna array is The horizontal and vertical lengths of the antenna array are and And taking N1=N3, N2=N4, O1=O3 and O2=O4, it can be determined that the horizontal dimension basis vector and the vertical dimension basis vector of the first codebook can be expressed as: Among them, when N3=N1=64, N4=N2=64, O3=O1=4 and O2=O2=4,

[0234] Similarly, the first distance parameter described above can be divided into multiple first distance parameter sets, and the second distance parameter can also be divided into multiple second distance parameter sets. The number of the multiple first distance parameter sets and the number of the multiple second distance parameter sets can be the same or different, and this is not limited in the present embodiment. In other words, the number K of the first distance parameter subsets and the number K of the second distance parameter subsets can be the same or different.

[0235] In some embodiments, K corresponding to each parameter can be configured in any of the following ways: configured by RRC; indicated by MAC-CE; or indicated by control signaling. For example, the value range of K can be [1, 4]. In this case, the value of K can be indicated by 2 bits. Optionally, the value range of K or the value of K can also be predefined by the protocol, for example, defined as 2.

[0236] In some embodiments, the first codebook is constructed based on an angle parameter, a distance parameter, and a common phase coefficient. Alternatively, the first codebook is constructed based on a first basis vector, a second basis vector, and a common phase coefficient. Alternatively, the first basis vector may be determined based on a first angle parameter and a first distance parameter, and the second basis vector may be determined based on a second angle parameter and a second distance parameter.

[0237] In some embodiments, the first codebook is used for single-polarization single-layer transmission, wherein the first codebook may be a Kronecker product of any first basis vector and any second basis vector in the above optional embodiments.

[0238] In some embodiments, the first codebook is used for dual-polarization multi-layer transmission, wherein the first codebook is constructed based on an angle parameter, a distance parameter, and a co-phase coefficient, and the co-phase coefficient corresponds to the number of layers of the dual-polarization multi-layer transmission.

[0239] Optionally, the first codebook is constructed based on the first basis vector, the second basis vector and the common phase coefficient. Optionally, the first basis vector can be determined based on the first angle parameter and the first distance parameter, and the second basis vector can be determined based on the second angle parameter and the second distance parameter.

[0240] In some embodiments, the common phase coefficient includes at least one of: binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), and octal phase shift keying (8-PSK).

[0241] In combination with some of the above embodiments, the first codebook can be constructed based on any one of the first basis vectors and any one of the second basis vectors and the common phase coefficient in the above embodiments. The first codebook can be constructed by calculating the Kronecker product for each first basis vector and each second basis vector, and based on the common phase coefficient.

[0242] Among them, in the case of dual-polarization multi-layer transmission, in the case of QPSK, the common phase coefficient can be any one of the four values ​​[1, -1, j, -j], in the case of BPSK, the common phase coefficient can be any one of the values ​​[1, -1], and in the case of 8PSK, the common phase coefficient can be Optionally, the near-field codebook may include a codeword constructed based on each angle parameter, each distance parameter, and each common phase coefficient.

[0243] The first basis vectors may include a plurality of basis vectors corresponding to each first angle parameter and each first distance parameter, and the second basis vectors may include a plurality of basis vectors corresponding to each second angle parameter and each second distance parameter.

[0244] The terminal can perform channel estimation based on the CSI-RS, and traverse the possible values ​​of the first angle parameter, the second angle parameter, the first distance parameter, and the second angle parameter, respectively, to obtain the most matching first basis vector and the second basis vector, and then determine the most matching codeword in the first codebook based on the common phase coefficient to obtain the first codeword.

[0245] Step S2102: The terminal sends first information to the network device.

[0246] In some embodiments, the first information is used to indicate a codeword determined by the terminal. Optionally, the first information is used to indicate the first codeword. Optionally, the first information is used to indicate an angle parameter and / or distance parameter corresponding to the first codeword. Optionally, the first information is used to indicate the best matching first basis vector and second basis vector determined by the terminal.

[0247] The distance parameter corresponding to the first codeword may be the first distance parameter and the second distance parameter determined by the terminal, and the angle parameter corresponding to the first codeword may be the most matching first angle parameter and the second angle parameter determined by the terminal.

[0248] In some embodiments, the first information includes at least one of the following: a first indication field, the first indication field is used to indicate a first angle parameter corresponding to the first codeword; a second indication field, the second indication field is used to indicate a second angle parameter corresponding to the first codeword; a third indication field, the third indication field is used to indicate a first distance parameter corresponding to the first codeword; and a fourth indication field, the fourth indication field is used to indicate a second distance parameter corresponding to the first codeword.

[0249] It can be understood that the first codeword can be determined based on the best matching first basis vector and the best matching second basis vector, the first angle parameter corresponding to the first codeword is also the first angle parameter corresponding to the best matching second basis vector, the second angle parameter corresponding to the first codeword is also the second angle parameter corresponding to the best matching second basis vector, the first distance parameter corresponding to the first codeword is also the first distance parameter corresponding to the best matching first basis vector, and the second distance parameter corresponding to the first codeword is also the second distance parameter corresponding to the best matching first basis vector.

[0250] In some embodiments, the first indication field includes at least bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0251] For example, if the number of angle parameters in the horizontal and vertical dimensions of the near-field codebook is N1O1=N2O2=4 and the number of distance parameters in the horizontal and vertical dimensions is N3O3=N4O4=4, the first indication field, the second indication field, the third indication field, and the fourth indication field can each include 2 bits. When the first indication field is 00, the second indication field is 01, the third indication field is 10, and the fourth indication field is 11, the first codeword indicated by the first information is a codeword with a first angle parameter of 0, a second angle parameter of 1, a first distance parameter of 3, and a second distance parameter of 4.

[0252] In some embodiments, the first indication field includes at least bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0253] The first distance parameter may be distributed in two first distance parameter subsets, and / or the second distance parameter may be distributed in two second distance parameter subsets, that is, the first distance parameter may be obtained by "hexagonal quantization", and the second distance parameter may also be obtained by "hexagonal quantization".

[0254] In some embodiments, the first indication field includes at least bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0255] Among them, the first angle parameter can be distributed in two first angle parameter subsets, and / or the second angle parameter can be distributed in two second angle parameter subsets, that is, the first angle parameter can be obtained by "hexagonal quantization", and the second angle parameter can also be obtained by "hexagonal quantization".

[0256] It is understandable that when the first antenna array is a uniform linear array, the terminal does not need to feedback relevant parameters of the vertical dimension. For example, the first information may only include relevant parameters of the horizontal dimension, for example, the first information only includes the first indication field and the third indication field. When the terminal is in the near-field region in only one of the horizontal or vertical dimensions, the terminal may only feedback relevant parameters of the dimension in the near-field region in the first basis vector that best matches the terminal. For example, if the first antenna array is a uniform planar array and the terminal is in the near-field region only in the horizontal dimension, the terminal may determine that the first information includes the first indication field, the second indication field, and the third indication field.

[0257] In some embodiments, the network device receives first information. Optionally, the network device determines a first codeword based on the first information. Optionally, the network device determines the best-matching first basis vector and second basis vector determined by the terminal based on the first information, and determines the first codeword based on the best-matching first basis vector and the best-matching second basis vector.

[0258] In some embodiments, the network device determines the best-matching first basis vector determined by the terminal based on the first angle parameter and the first distance parameter indicated by the first information, and determines the best-matching second basis vector determined by the terminal based on the second distance parameter and the second angle parameter indicated by the first information, and further determines the first codeword based on the best-matching first basis vector and the best-matching second basis vector.

[0259] In some embodiments, the first information may be “codeword feedback information”, “codeword indication information”, etc., and the embodiments of the present disclosure do not limit the names thereof.

[0260] Step S2103: The terminal sends second information to the network device.

[0261] In some embodiments, the second information is used to indicate a common phase coefficient corresponding to the first codeword.

[0262] In some embodiments, the second information is used to indicate that the first codeword is used for dual-polarization multi-layer transmission. Optionally, the second information is used to indicate that the codebook corresponding to the first codeword is used for dual-polarization multi-layer transmission. In some embodiments, the second information may include N bits, where N is used to indicate a common phase coefficient. For example, when N is 1, the second information is used to indicate that the common phase coefficient corresponding to the first codeword is BPSK; when N is 2, the second information is used to indicate that the common phase coefficient corresponding to the first codeword is QPSK; and when N is 3, the second information is used to indicate that the common phase coefficient corresponding to the first codeword is 8-PSK.

[0263] It can be understood that if it is QPSK, the common phase coefficient corresponding to the first codeword can be any one of the four values ​​[1, -1, j, -j], which can be indicated by 2 bits; if it is BPSK, the common phase coefficient corresponding to the first codeword can be any one of the values ​​[1, -1], which can be indicated by 1 bit; if it is 8PSK, the common phase coefficient corresponding to the first codeword can be Any one of the eight values ​​can be indicated using 3 bits.

[0264] For example, when the second information includes 1 bit, when the value of the bit is 1, the common phase coefficient corresponding to the first codeword may be 1; when the value of the bit is 0, the common phase coefficient corresponding to the first codeword may be -1.

[0265] In some embodiments, the network device receives the second information. Optionally, the network device determines, based on the second information, a codebook corresponding to the first codeword for use in dual-polarization multi-layer operations. Optionally, the network device determines the first codeword based on the first information and the second information.

[0266] For example, the network device determines the angle parameter and distance parameter corresponding to the first codeword based on the first information. The network device can also determine the common phase coefficient corresponding to the codebook corresponding to the first codeword based on the second information. The network device can then determine the codebook with the best communication quality for the terminal based on the angle parameter, distance parameter and common phase coefficient, and the corresponding codeword. The codeword is the first codeword determined by the terminal.

[0267] In some embodiments, the first information and the second information may be the same information, for example, different fields within the same information. Alternatively, the first information and the second information may be different information, for example, carried by different information elements. This disclosure is not limited to this.

[0268] In some embodiments, the second information may be "common phase coefficient indication information", "transmission type indication information", etc. The embodiment of the present disclosure does not limit the name of the second information.

[0269] In combination with some of the above embodiments, in one example, the first antenna array is a uniform array, and the terminal can perform channel estimation based on the CSI-RS, and when it is determined that both the horizontal dimension and the vertical dimension are switched to the near-field area, the terminal further determines the best matching first basis vector and the best matching second basis vector and the common phase coefficient in the first codebook, that is, determines the first codeword in the first codebook. Specifically, the terminal can determine the best matching first angle parameter, second angle parameter, first distance parameter, second distance parameter and common phase coefficient, and generate corresponding first information and second information.

[0270] After receiving the first information, the network device can determine the most matching first distance parameter, second distance parameter, first angle parameter and second angle parameter determined by the terminal based on the first information, and then determine the most matching first basis vector and second basis vector of the terminal. Furthermore, the network device can determine the first codeword determined by the terminal based on the second basis vector, the first basis vector and the common phase coefficient indicated by the second information, and transmit the wireless signal based on the first codeword.

[0271] In the above embodiment, the angle domain / distance domain can be divided into multiple subsets, and a "staggered" quantization method can be used in different subsets to reduce the number of quantization points. Typically, when divided into two subsets, it can be understood that the precoding coverage area changes from a rectangle to a hexagon. Since the "distance" between adjacent polarization domain precodings remains unchanged, there is theoretically no performance loss. In addition, since the area of ​​the hexagon is larger than the area of ​​the rectangle, the number of quantization points can be reduced, potentially reducing bit overhead.

[0272] It is understandable that the terminal may further construct a first codebook that is used only when either the horizontal dimension or the distance dimension is in the near field area, and may further construct a first codebook corresponding to a uniform linear array. The specific implementation methods may be referred to the description in the above embodiments and will not be repeated here.

[0273] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0274] In some embodiments, the terms "codebook," "codeword," and "precoding matrix" may be used interchangeably. For example, a codebook may be a collection of one or more codewords / precoding matrices.

[0275] In some embodiments, terms such as "uplink", "uplink", "physical uplink" can be interchangeable with each other, and terms such as "downlink", "downlink", "physical downlink" can be interchangeable with each other, and terms such as "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" can be interchangeable with each other.

[0276] In some embodiments, the terms "downlink control information (DCI)", "downlink (DL) assignment", "DL DCI", "uplink (UL) grant", "UL DCI" and the like may be used interchangeably.

[0277] In some embodiments, terms such as "physical downlink shared channel (PDSCH)" and "DL data" can be used interchangeably, and terms such as "physical uplink shared channel (PUSCH)" and "UL data" can be used interchangeably.

[0278] In some embodiments, terms such as "moment", "time point", "time", and "time position" can be replaced with each other, and terms such as "duration", "period", "time window", "window", and "time" can be replaced with each other.

[0279] In some embodiments, terms such as wireless access scheme and waveform may be used interchangeably.

[0280] In some embodiments, the terms "precoding", "precoder", "weight", "precoding weight", "quasi-co-location (QCL)", "transmission configuration indication (TCI) state", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "the number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angular degree", "antenna", "antenna element", "panel" and the like can be used interchangeably.

[0281] In some embodiments, terms such as "frame", "radio frame", "subframe", "slot", "sub-slot", "mini-slot", "symbol", "symbol", and "transmission time interval (TTI)" can be used interchangeably.

[0282] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0283] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0284] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, or first A, etc., but not limited to this.

[0285] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a predetermined value), but is not limited thereto.

[0286] In some embodiments, "not expecting to receive" can be interpreted as not receiving on time domain resources and / or frequency domain resources, or as not performing subsequent processing on the data after receiving it; "not expecting to send" can be interpreted as not sending, or as sending but not expecting the recipient to respond to the content sent.

[0287] The communication method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2103. For example, step S2101 may be implemented as an independent embodiment, step S2102 may be implemented as an independent embodiment, step S2101 and step S2103 may be implemented as independent embodiments, and step S2102 and step S2103 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0288] In some embodiments, step S2102 and step S2103 may be executed in an interchangeable order or simultaneously.

[0289] In some embodiments, steps S2102 to S2103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0290] In some embodiments, step S2101 and step S2103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0291] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2A .

[0292] FIG3A is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3A , the embodiment of the present disclosure relates to a communication method (terminal side), the method comprising:

[0293] Step S3101: Determine a first codeword in a first codebook.

[0294] The optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0295] Step S3102, sending the first information.

[0296] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0297] In some embodiments, the network device sends the first information to the terminal, but is not limited thereto, and the first information may also be sent to other entities.

[0298] Step S3103, sending the second information.

[0299] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0300] In some embodiments, the network device sends the first information to the terminal, but is not limited thereto, and the first information may also be sent to other entities.

[0301] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3103. For example, step S3101 may be implemented as an independent embodiment, step S3102 may be implemented as an independent embodiment, step S3101 and step S3103 may be implemented as independent embodiments, and step S3102 and step S3103 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0302] In some embodiments, step S3102 and step S3103 may be executed in an interchangeable order or simultaneously.

[0303] In some embodiments, steps S3102 to S3103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0304] In some embodiments, step S3101 and step S3103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0305] FIG3B is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3B , the embodiment of the present disclosure relates to a communication method (terminal side), the method comprising:

[0306] Step S3201: Determine a first codeword in a first codebook.

[0307] The optional implementation of step S3201 can refer to the optional implementation of step S2101 in Figure 2A, step S3101 in Figure 3A, and other related parts in the embodiments involved in Figures 2A and 3A, which will not be repeated here.

[0308] Step S3202, sending the first information.

[0309] The optional implementation of step S3202 can refer to the optional implementation of step S2101 in Figure 2A, step S3102 in Figure 3A, and other related parts in the embodiments involved in Figures 2A and 3A, which will not be repeated here.

[0310] In some embodiments, the terminal determines a first codeword in a first codebook, where the first codebook is constructed based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used when the terminal is in a near-field area of ​​a first antenna array, where the first antenna array is an antenna array used by a network device to transmit wireless signals to the terminal.

[0311] The terminal sends first information to the network device, where the first information is used to indicate a first codeword.

[0312] In some embodiments, the first antenna array is any one of the following: a uniform linear array; a uniform planar array.

[0313] In some embodiments, the first antenna array includes N1 antenna ports in the horizontal dimension and N2 antenna ports in the vertical dimension, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1.

[0314] In some embodiments, the angle parameter includes: at least one first angle parameter, the first angle parameter is obtained by quantizing the horizontal dimension angle domain in the near field region according to the number of antenna ports N1 in the horizontal dimension and the oversampling factor O1 of the horizontal dimension angle domain; and / or at least one second angle parameter, the second angle parameter is obtained by quantizing the vertical dimension angle domain in the near field region according to the number of antenna ports N2 in the vertical dimension and the oversampling factor O2 of the vertical dimension angle domain;

[0315] The distance parameters include: at least one first distance parameter, a first angle parameter obtained by quantizing the horizontal dimension distance domain in the near field area based on the number of sampling points N3 in the horizontal dimension and the oversampling factor O3 of the horizontal dimension distance domain; and / or, at least one second distance parameter, a second angle parameter obtained by quantizing the vertical dimension distance domain in the near field area based on the number of sampling points N4 in the vertical dimension and the oversampling factor O4 of the vertical dimension distance domain.

[0316] In some embodiments, the plurality of first distance parameters are distributed in K first distance parameter subsets, and the quantization offsets of the first angle parameters corresponding to the first distance parameters distributed in different first distance parameter subsets are different; and / or,

[0317] The plurality of second distance parameters are distributed in K second distance parameter subsets, and the quantization offsets of the second angle parameters corresponding to the second distance parameters distributed in different second distance parameter subsets are different.

[0318] In some embodiments, the quantization offset of the first angle parameter corresponding to the first distance parameter in the first distance parameter subset indexed by k is The first distance parameter in the first distance parameter subset indexed by k corresponds to the first angle parameter And / or, the quantization offset of the second angle parameter corresponding to the second distance parameter in the second distance parameter subset indexed by k is The second distance parameter in the second distance parameter subset indexed by k corresponds to the second angle parameter Wherein, 0≤k≤K-1 and k is an integer.

[0319] In some embodiments, K=2, the first distance parameter and / or, a second distance parameter

[0320] In some embodiments, the basis vector of the first codebook is the Kronecker product of the first basis vector in the horizontal dimension and the second basis vector in the vertical dimension; the n′1th element in the first basis vector v is for: and / or, the n′2th element in the second basis vector u for: Where j is the imaginary unit, λ represents the wavelength of the wireless signal, and d x Denotes the horizontal antenna spacing of the first antenna array, D x Denotes the horizontal dimension length of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D z Represents the vertical dimension length of the first antenna array.

[0321] In some embodiments, N1 = N3 and O1 = O3, the n′1-th element in the first basis vector v is: and / or N2 = N4 and O2 = O4, the n′2-th element in the second basis vector u is:

[0322] In some embodiments, multiple first angle parameters are distributed in K first angle parameter subsets, and the quantization offsets of the first distance parameters corresponding to the first angle parameters distributed in different first angle parameter subsets are different; and / or, multiple second angle parameters are distributed in K second angle parameter subsets, and the quantization offsets of the second distance parameters corresponding to the second angle parameters distributed in different second angle parameter subsets are different.

[0323] In some embodiments, the quantization offset of the first distance parameter corresponding to the first angle parameter in the first angle parameter subset with index k is the first distance parameter corresponding to the first angle parameter in the first angle parameter subset with index k and / or, the quantization offset of the second distance parameter corresponding to the second angle parameter in the second angle parameter subset with index k is the second distance parameter corresponding to the second angle parameter in the second angle parameter subset with index k where 0 < k ≤ K and k is an integer.

[0324] In some embodiments, K = 2, the first angle parameter and / or, the second angle parameter

[0325] In some embodiments, the n′1-th element in the first basis vector v is: and / or, the n′2-th element in the second basis vector u is: where j is the imaginary unit, λ represents the wavelength of the wireless signal, d x represents the antenna spacing in the horizontal dimension of the first antenna array, D x represents the length of the first antenna array in the horizontal dimension, d z represents the antenna spacing in the vertical dimension of the first antenna array, D z represents the length of the first antenna array in the vertical dimension.

[0326] In some embodiments, N1 = N3 and O1 = O3, the n′1-th element in the first basis vector v is: and / or N2 = N4 and O2 = O4, the n'2-th element in the second base vector u is:

[0327] In some embodiments, the first information includes at least one of the following: a first indication field for indicating a first angle parameter corresponding to a first codeword; a second indication field for indicating a second angle parameter corresponding to the first codeword; a third indication field for indicating a first distance parameter corresponding to the first codeword; a fourth indication field for indicating a second distance parameter corresponding to the first codeword.

[0328] In some embodiments, the first indication field includes at least bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0329] In some embodiments, the first indication field includes at least bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0330] In some embodiments, the first codebook is used for single-polarization single-layer transmission; or,

[0331] the first codebook is used for dual-polarization multi-layer transmission, and the first codebook is constructed based on angle parameters, distance parameters, and co-phase coefficients.

[0332] In some embodiments, the method further includes: the terminal sending second information to the network device, where the second information is used to indicate the co-phase coefficient corresponding to the first codeword.

[0333] In some embodiments, the co-phase coefficient includes at least one of the following: binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), and octal phase shift keying (8-PSK).

[0334] FIG. 4A is a schematic flowchart of a communication method according to an embodiment of the present disclosure. As shown in FIG. 4A, the embodiment of the present disclosure relates to a communication method (on the network device side), and the above method includes:

[0335] Step S4101, obtaining first information.

[0336] ]>The optional implementation of step S4101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0337] In some embodiments, the network device receives the first information sent by the terminal, but is not limited thereto and may also receive the first information sent by other entities.

[0338] In some embodiments, the network device obtains first information specified by a protocol.

[0339] In some embodiments, the network device obtains the first information from an upper layer(s).

[0340] In some embodiments, the network device performs processing to obtain the first information.

[0341] Step S4102, obtaining second information.

[0342] The optional implementation of step S4101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0343] In some embodiments, the network device receives the second information sent by the terminal, but is not limited thereto and may also receive the second information sent by other entities.

[0344] In some embodiments, the network device obtains second information specified by the protocol.

[0345] In some embodiments, the network device obtains the second information from an upper layer(s).

[0346] In some embodiments, the network device performs processing to obtain the second information.

[0347] In some embodiments, step S4102 is omitted, and the terminal autonomously implements the function indicated by the second information, or the above function is default or acquiescent.

[0348] The communication method involved in the embodiment of the present disclosure may include at least one of steps S4101 to S4102. For example, step S4101 may be implemented as an independent embodiment, and step S4102 may be implemented as an independent embodiment, but the present invention is not limited thereto.

[0349] In some embodiments, step S4101 and step S4102 may be executed in an interchangeable order or simultaneously.

[0350] In some embodiments, step S4101 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0351] In some embodiments, step S4102 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0352] FIG4B is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4B , the embodiment of the present disclosure relates to a communication method (network device side), the method comprising:

[0353] Step S4201, obtain first information.

[0354] The optional implementation of step S4201 can refer to step S2101 in Figure 2A, the optional implementation of step S4101 in Figure 4A, and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0355] In some embodiments, the network device receives first information sent by the terminal, the first information is used to indicate a first codeword, the first codeword is a codeword in a first codebook, the first codebook is constructed based on an angle parameter set and a distance parameter set, the first codebook is a codebook used when the terminal is in the near field area of ​​the first antenna array, and the first antenna array is an antenna array for the network device to transmit wireless signals to the terminal.

[0356] In some embodiments, the first antenna array is any one of the following: a uniform linear array; a uniform planar array.

[0357] In some embodiments, the first antenna array includes N1 antenna ports in the horizontal dimension and N2 antenna ports in the vertical dimension, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1.

[0358] In some embodiments, the angle parameter includes: at least one first angle parameter, the first angle parameter is obtained by quantizing the horizontal dimension angle domain in the near field region according to the number of antenna ports N1 in the horizontal dimension and the oversampling factor O1 of the horizontal dimension angle domain; and / or at least one second angle parameter, the second angle parameter is obtained by quantizing the vertical dimension angle domain in the near field region according to the number of antenna ports N2 in the vertical dimension and the oversampling factor O2 of the vertical dimension angle domain;

[0359] The distance parameters include: at least one first distance parameter, a first angle parameter obtained by quantizing the horizontal dimension distance domain in the near field area based on the number of sampling points N3 in the horizontal dimension and the oversampling factor O3 of the horizontal dimension distance domain; and / or, at least one second distance parameter, a second angle parameter obtained by quantizing the vertical dimension distance domain in the near field area based on the number of sampling points N4 in the vertical dimension and the oversampling factor O4 of the vertical dimension distance domain.

[0360] In some embodiments, multiple first distance parameters are distributed in K first distance parameter subsets, and the quantization offsets of first angle parameters corresponding to first distance parameters distributed in different first distance parameter subsets are different; and / or, multiple second distance parameters are distributed in K second distance parameter subsets, and the quantization offsets of second angle parameters corresponding to second distance parameters distributed in different second distance parameter subsets are different.

[0361] In some embodiments, the quantization offset of the first angle parameter corresponding to the first distance parameter in the first distance parameter subset indexed by k is The first distance parameter in the first distance parameter subset indexed by k corresponds to the first angle parameter And / or, the quantization offset of the second angle parameter corresponding to the second distance parameter in the second distance parameter subset indexed by k is The second distance parameter in the second distance parameter subset indexed by k corresponds to the second angle parameter Wherein, 0≤k≤K-1 and k is an integer.

[0362] In some embodiments, K=2, the first distance parameter and / or, a second distance parameter

[0363] In some embodiments, the basis vector of the first codebook is the Kronecker product of the first basis vector in the horizontal dimension and the second basis vector in the vertical dimension; the n′1th element in the first basis vector v is for: and / or, the n′2th element in the second basis vector u for: Where j is the imaginary unit, λ represents the wavelength of the wireless signal, and d x Denotes the horizontal antenna spacing of the first antenna array, D x Denotes the horizontal dimension length of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D z Represents the vertical dimension length of the first antenna array.

[0364] In some embodiments, N1 = N3 and O1 = O3, the n'1-th element in the first basis vector v is: and / or, N2 = N4 and O2 = O4, the n'2-th element in the second basis vector u is:

[0365] In some embodiments, multiple first angle parameters are distributed in K first angle parameter subsets, and the quantization offsets of the first distance parameters corresponding to the first angle parameters in different first angle parameter subsets are different; and / or,

[0366] Multiple second angle parameters are distributed in K second angle parameter subsets, and the quantization offsets of the second distance parameters corresponding to the second angle parameters in different second angle parameter subsets are different.

[0367] In some embodiments, the quantization offset of the first distance parameter corresponding to the first angle parameter in the first angle parameter subset with index k is the first distance parameter corresponding to the first angle parameter in the first angle parameter subset with index k and / or, the quantization offset of the second distance parameter corresponding to the second angle parameter in the second angle parameter subset with index k is the second distance parameter corresponding to the second angle parameter in the second angle parameter subset with index k where 0 < k ≤ K and k is an integer.

[0368] In some embodiments, K = 2, the first angle parameter and / or, the second angle parameter

[0369] In some embodiments, the n'1-th element in the first basis vector v is: and / or, the n'2-th element in the second basis vector u is:

[0370] where j is the imaginary unit, λ represents the wavelength of the wireless signal, d x represents the antenna spacing in the horizontal dimension of the first antenna array, D x represents the length of the first antenna array in the horizontal dimension, d z represents the antenna spacing in the vertical dimension of the first antenna array, D z represents the length of the first antenna array in the vertical dimension.

[0371] In some embodiments, N1 = N3 and O1 = O3, the n′1-th element in the first basis vector v is: and / or N2 = N4 and O2 = O4, the n′2-th element in the second basis vector u is:

[0372] In some embodiments, the first information includes at least one of the following:

[0373] A first indication field for indicating a first angle parameter corresponding to a first codeword; a second indication field for indicating a second angle parameter corresponding to the first codeword; a third indication field for indicating a first distance parameter corresponding to the first codeword; a fourth indication field for indicating a second distance parameter corresponding to the first codeword.

[0374] In some embodiments, the first indication field includes at least bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0375] In some embodiments, the first indication field includes at least bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0376] In some embodiments, the first codebook is used for single-polarization single-layer transmission; or, the first codebook is used for dual-polarization multi-layer transmission, and the first codebook is constructed based on an angle parameter, a distance parameter, and a co-phase coefficient.

[0377] In some embodiments, the method further includes: The network device receives second information sent by the terminal, and the second information is used to indicate the co-phase coefficient corresponding to the first codeword.

[0378] In some embodiments, the co-phase coefficient includes at least one of the following: binary phase shift keying BPSK, quadrature phase shift keying QPSK, and eight-phase phase shift keying 8-PSK.

[0379] FIG. 5 is an interaction schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 5, the embodiment of the present disclosure relates to a communication method, and the above method includes:

[0380] Step S5101, the terminal determines a first codeword in the first codebook.

[0381] The optional implementation of step S5101 can be found in the optional implementation of step S2101 in Figure 2A, step S3101 in Figure 3A, step S3201 in Figure 3B, and other related parts in the embodiments involved in Figures 2A, 3A, 3B, 4A, and 4B, which will not be repeated here.

[0382] Step S5102: The terminal sends first information to the network device.

[0383] For the optional implementation of step S5102, please refer to step S2102 in Figure 2A, step S3102 in Figure 3A, step S3202 in Figure 3B, step S4101 in Figure 4A, the optional implementation of step S4201 in Figure 4B, and other related parts in the embodiments involved in Figures 2A, 3A, 3B, 4A, and 4B, which will not be repeated here.

[0384] In some embodiments, the above method may include the methods of the above terminal side and network device side embodiments, which will not be repeated here.

[0385] Figure 6 is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 6, the embodiment of the present disclosure relates to a communication method, and the method includes:

[0386] Step S6101: The terminal is in the near field area of ​​the first antenna array and determines a first codeword from a first codebook.

[0387] In some embodiments, the first codebook is a codebook used when the terminal is in a near-field area of ​​a first antenna array, and the first antenna array is an antenna array used by a network device to transmit wireless signals to the terminal.

[0388] In some embodiments, the first antenna array is a uniform linear array.

[0389] For a uniform linear array, in some embodiments, the first codebook may be represented as a precoding vector v, and the n′1th element of the precoding vector v may be calculated as:

[0390] Where N1 and N3 represent the number of sampling points in the horizontal dimension angle domain and the horizontal dimension distance domain respectively, O1 and O3 represent the oversampling factors in the horizontal dimension angle domain and the horizontal dimension distance domain respectively, l = 0, 1, ..., N1O1-1 and o1 = 1, 2, ..., N3O3.

[0391] At this time, the indication information of the precoding matrix includes l=0,1,…,N1O1-1 and o1=1,2,…,N3O3 (and the common phase coefficient). In order to reduce the number of precoding matrices and potentially reduce the bit overhead, the angle domain can be divided into multiple subsets, and in different angle domain subsets, the distance domain uses different quantization starting points. Alternatively, the distance domain can be divided into multiple subsets, and in different distance domain subsets, the angle domain uses different quantization starting points. For example, the following indication method can be considered. When mod(o1,K)=k, The integer K is a preconfigured parameter, 0≤k≤K-1, and k is an integer. The specific value range of the index o1 can be calculated according to different situations.

[0392] In some embodiments, K can be configured in any of the following ways: by RRC configuration; by MAC-CE indication; or by control signaling. For example, the value range of K can be [1, 4], in which case the value of K can be indicated by 2 bits. Alternatively, the value range of K or the value of K can also be predefined by the protocol, for example, defined as 2.

[0393] In some embodiments, as shown in Figures 2B and 2C , the circles in the figures may represent quantization points, each of which may correspond to a precoding matrix or a codeword. In Figure 2B , a "rectangular quantization" approach is employed, whereby the polarization domain is quantized according to rectangular regions. This means that any codeword can be used to quantize channels within its corresponding rectangular region, meaning that the range covered by any precoding matrix is ​​rectangular. In Figure 2C , a "hexagonal quantization" approach is employed, whereby the range covered by any precoding matrix is ​​rectangular.

[0394] Assume that the quantization interval of the distance domain in "rectangular quantization" is 2d, the total number of quantization points is N3O3, and the quantization interval of the distance domain in "hexagonal quantization" is The total number of quantized points is X, so we only need to ensure This means that when "hexagonal quantization" is used, the distance between any codeword and the center is equal to that of "rectangular quantization". In order to ensure that the performance of "hexagonal quantization" is better than or equal to that of "rectangular quantization", it is only necessary to

[0395] At this time, the feedback coefficient can be designed as follows: Case 1: When When o1 is an odd number, l=0,1,…,N1O1-1; when When o1 is an even number, Case 2: When When o1 is an odd number, when And when o1 is an even number, l=0,1,…,N1O1-1.

[0396] At this time, the precoding matrix corresponding to the first codebook can be expressed as:

[0397] Assume that the antenna spacing in the horizontal dimension of the antenna array is Horizontal dimension of antenna array When N1=N3 and O1=O3, the precoding vector can be calculated as: Among them, when N3=N1=64 and O3=O1=4, then

[0398] Among them, case 1: when o1∈1,3,…,241 and o1 is an odd number, l=0,1,…,255; when o1∈2,…,242 and o1 is an even number, Case 2: When o1∈1,3,…,241 and o1 is an odd number, When o1∈2,…,242 and o1 is an even number, l=0,1,…,255.

[0399] In some embodiments, the first antenna array is a homogeneous linear array.

[0400] For a homogeneous linear array, in some embodiments, the first codebook can be expressed as The n′1th element of the precoding vector v and the n′2th element of the precoding vector u can be calculated as:

[0401] Where N1, N2, N3 and N4 represent the number of sampling points in the horizontal dimension angle domain, vertical dimension angle domain, horizontal dimension distance domain and vertical dimension distance domain respectively, O1, O2, O3 and O4 represent the oversampling factors in the horizontal dimension angle domain, vertical dimension angle domain, horizontal dimension distance domain and vertical dimension distance domain respectively, l = 0, 1, ..., N1O1-1, m = 0, 1, ..., N2O2-1, o1 = 1, 2, ..., N3O3 and o2 = 1, 2, ..., N4O4.

[0402] At this time, the indication information of the precoding matrix includes l=0,1,…,N1O1-1, m=0,1,…,N2O2-1, o1=1,2,…,N3O3 and o2=1,2,…,N4O4 (and the common phase coefficient). In order to reduce the number of precoding matrices and potentially reduce the bit overhead, the angle domain can be divided into multiple subsets, and in different angle domain subsets, the distance domain adopts different quantization starting points. Alternatively, the distance domain can be divided into multiple subsets, and in different distance domain subsets, the angle domain adopts different quantization starting points. For example, the following indication method can be considered. When mod(o1,K)=k, The integer K is a pre-configured parameter, 0≤k≤K-1 and k is an integer. The specific value range of index o1 can be calculated according to different situations. When mod(o2,K)=k, The integer K is a preconfigured parameter, 0≤k≤K-1 and k is an integer. The specific value range of the index o2 can be calculated according to different situations. The K in the horizontal dimension and the vertical dimension can also be configured to different values.

[0403] Assume that the configuration parameter K = 2, which means that the angle domain or distance domain is divided into two sets. Similar to the uniform linear array model, in order to reduce the number of codewords, the "hexagonal area quantization" scheme is also adopted. At this time, the number of points quantized in the horizontal dimension is The number of points for vertical area quantization is

[0404] Optionally, the coefficient of horizontal dimension feedback can be designed as follows:

[0405] Case 1: When When o1 is an odd number, l=0,1,…,N1O1-1; when When o1 is an even number, Case 2: When When o1 is an odd number, when And when o1 is an even number, l=0,1,…,N1O1-1.

[0406] Optionally, the coefficient of vertical dimension feedback can be designed as follows:

[0407] Case 1: When When o2 is an odd number, m=0,1,…,N2O2-1; When it is an even number, Case 2: When When o2 is an odd number, when And when o2 is an even number, m=0,1,…,N2O2-1.

[0408] Among them, the feedback coefficient schemes of the horizontal dimension and the vertical dimension can be randomly combined.

[0409] In some embodiments, the precoding matrix may be expressed as:

[0410] For example, suppose the antenna array horizontal and vertical antenna spacing is The horizontal and vertical lengths of the antenna array are and And taking N1=N3, N2=N4, O1=O3 and O2=O4, the precoding vectors v and u can be calculated as:

[0411] Among them, when N3=N1=64, N4=N2=64, O3=O1=4 and O2=O2=4, then

[0412] In some embodiments, different feedback parameters may be indicated by the following information fields, for example:

[0413] pass Bit indication l=0,…N1O1-1, using broadband or sub-band feedback; Bit indication m=0,…N2O2-1, using broadband or sub-band feedback; Bit Indication Using broadband or sub-band feedback; Bit Indication Wideband or sub-band feedback is adopted; the common phase coefficient is indicated by 1, 2 or 3 bits, corresponding to the common phase coefficients of BPSK, QPSK and 8-PSK respectively, and wideband or sub-band feedback is adopted.

[0414] In the above embodiment, the angle domain / distance domain can be divided into multiple subsets, and a "staggered" quantization method can be used in different subsets to reduce the number of quantization points. Typically, when divided into two subsets, it can be understood that the precoding coverage area changes from a rectangle to a hexagon. Since the "distance" between adjacent polarization domain precodings remains unchanged, there is theoretically no performance loss. In addition, since the area of ​​the hexagon is larger than the area of ​​the rectangle, the number of quantization points can be reduced, potentially reducing bit overhead.

[0415] In the embodiments of the present disclosure, some or all of the steps and their optional implementations may be arbitrarily combined with some or all of the steps in other embodiments, or may be arbitrarily combined with the optional implementations of other embodiments.

[0416] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network function node, a core network device, a terminal, a network device, etc.) in any of the above methods.

[0417] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0418] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0419] Figure 7A is a schematic diagram of the structure of the terminal proposed in an embodiment of the present disclosure. As shown in Figure 7A, the terminal 7100 may include: at least one of a transceiver module 7101 and a processing module 7102. In some embodiments, the processing module 7102 is used to determine a first codeword in a first codebook, wherein the first codebook is constructed based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used by the terminal in the near field area of ​​the first antenna array, and the first antenna array is an antenna array used by the network device to transmit wireless signals to the terminal; the transceiver module 7101 is used to send first information to the network device, and the first information is used to indicate the first codeword. Optionally, the transceiver module 7101 is used to perform at least one of the communication steps such as sending and / or receiving performed by the terminal in any of the above methods (for example, step S2102, step S2103, but not limited thereto), which are not repeated here. Optionally, the processing module 7102 is used to perform at least one of the other steps (for example, step S2101) performed by the terminal in any of the above methods, which are not repeated here.

[0420] Figure 7B is a structural diagram of a network device proposed in an embodiment of the present disclosure. As shown in Figure 7B, the network device 7200 may include: at least one of a transceiver module 7201, a processing module 7202, etc. In some embodiments, the transceiver module 7201 is used to receive first information sent by the terminal, the first information is used to indicate a first codeword, the first codeword is a codeword in a first codebook, the first codebook is constructed based on an angle parameter set and a distance parameter set, the first codebook is a codebook used when the terminal is in the near field area of ​​the first antenna array, and the first antenna array is an antenna array for the network device to transmit a wireless signal to the terminal. Optionally, the transceiver module 7201 is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S2102, step S2103, but not limited to this) performed by the network device in any of the above methods, which will not be repeated here. Optionally, the processing module 7202 is used to execute at least one of the other steps performed by the network device in any of the above methods, which will not be repeated here.

[0421] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0422] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules each execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0423] Figure 8A is a schematic diagram of the structure of a communication device 8100 proposed in an embodiment of the present disclosure. Communication device 8100 can be a network device (e.g., an access network device, a core network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. Communication device 8100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0424] As shown in Figure 8A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 8100 is used to perform any of the above methods. Optionally, one or more processors 8101 are used to call instructions to enable the communication device 8100 to perform any of the above methods.

[0425] In some embodiments, the communication device 8100 further includes one or more transceivers 8102. When the communication device 8100 includes one or more transceivers 8102, the transceiver 8102 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2102 and step S2103, but not limited thereto), and the processor 8101 performs at least one of the other steps (for example, step S2101, but not limited thereto). In an optional embodiment, the transceiver may include a receiver and / or a transmitter, and the receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface may be interchangeable, the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be interchangeable, and the terms receiver, receiving unit, receiver, and receiving circuit may be interchangeable.

[0426] In some embodiments, the communication device 8100 further includes one or more memories 8103 for storing data. Alternatively, all or part of the memories 8103 may be located outside the communication device 8100. In alternative embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuits 8104 are connected to the memories 8103 and may be configured to receive data from the memories 8103 or other devices, or to send data to the memories 8103 or other devices. For example, the interface circuits 8104 may read data stored in the memories 8103 and send the data to the processor 8101.

[0427] The communication device 8100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 8A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0428] FIG8B is a schematic diagram of the structure of a chip 8200 according to an embodiment of the present disclosure. If the communication device 8100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 8200 shown in FIG8B , but the present disclosure is not limited thereto.

[0429] The chip 8200 includes one or more processors 8201. The chip 8200 is configured to execute any of the above methods.

[0430] In some embodiments, chip 8200 further includes one or more interface circuits 8202. Terms such as interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 8200 further includes one or more memories 8203 for storing data. Alternatively, all or part of memory 8203 may be located external to chip 8200. Optionally, interface circuit 8202 is connected to memory 8203 and may be used to receive data from memory 8203 or other devices, or may be used to send data to memory 8203 or other devices. For example, interface circuit 8202 may read data stored in memory 8203 and send the data to processor 8201.

[0431] In some embodiments, the interface circuit 8202 performs at least one of the communication steps (e.g., step S2102 and step S2103, but not limited thereto) of the aforementioned method. The interface circuit 8202 performing the communication steps (e.g., step S2102 and step S2103, but not limited thereto) of the aforementioned method means, for example, that the interface circuit 8202 performs data exchange between the processor 8201, chip 8200, memory 8203, or a transceiver device. In some embodiments, the processor 8201 performs at least one of the other steps (e.g., step S2101, but not limited thereto).

[0432] The modules and / or devices described in various embodiments, such as virtual devices, physical devices, and chips, can be arbitrarily combined or separated according to circumstances. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0433] The present disclosure also proposes a storage medium having instructions stored thereon, which, when executed on the communication device 8100, causes the communication device 8100 to execute any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto, and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto, and may also be a temporary storage medium.

[0434] The present disclosure also provides a program product, which, when executed by the communication device 8100, enables the communication device 8100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0435] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

Claims

1. A communication method, characterized in that, The method includes: The terminal determines a first codeword in a first codebook, where the first codebook is obtained based on a set of angle parameters and a set of distance parameters, and the first codebook is a codebook used by the terminal in the near-field region of a first antenna array; The terminal sends first information to the network device, where the first information is used to indicate the first codeword.

2. The method according to claim 1, wherein The first antenna array is any one of the following: a uniform linear array; a uniform planar array.

3. The method according to any one of claims 1-2, characterized in that, The first antenna array includes N1 antenna ports in the horizontal dimension and N2 antenna ports in the vertical dimension, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1.

4. The method according to any one of claims 1-3, wherein The angle parameters include: At least one first angle parameter, where the first angle parameter is obtained by quantizing the horizontal dimension angle domain in the near-field region according to the number of antenna ports N1 in the horizontal dimension and the oversampling factor O1 of the horizontal dimension angle domain; and / or, At least one second angle parameter, where the second angle parameter is obtained by quantizing the vertical dimension angle domain in the near-field region according to the number of antenna ports N2 in the vertical dimension and the oversampling factor O2 of the vertical dimension angle domain; The distance parameters include: At least one first distance parameter, where the first distance parameter is obtained by quantizing the horizontal dimension distance domain in the near-field region according to the number of sampling points N3 in the horizontal dimension and the oversampling factor O3 of the horizontal dimension distance domain; and / or, At least one second distance parameter, where the second distance parameter is obtained by quantizing the vertical dimension distance domain in the near-field region according to the number of sampling points N4 in the vertical dimension and the oversampling factor O4 of the vertical dimension distance domain.

5. The method according to claim 4, wherein Multiple first distance parameters are distributed in K first distance parameter subsets, and the quantization offsets of the first angle parameters corresponding to the first distance parameters in different first distance parameter subsets are different; and / or, Multiple second distance parameters are distributed in K second distance parameter subsets, and the quantization offsets of the second angle parameters corresponding to the second distance parameters in different second distance parameter subsets are different.

6. The method according to claim 5, wherein The quantization offset of the first distance parameter corresponding to the first angle parameter in the first subset of distance parameters indexed by k is The first distance parameter in the first subset of distance parameters indexed by k corresponds to the first angle parameter and / or, The quantization offset of the second distance parameter corresponding to the second angle parameter in the second distance parameter subset indexed by k is The second distance parameter in the second subset of distance parameters with index k corresponds to the second angle parameter where 0≤k≤K-1 and k is an integer.

7. The method according to claim 6, characterized in that, K＝2， the first distance parameter and / or, the second distance parameter 8. The method according to claim 7, wherein The basis vector of the first codebook is the Kronecker product of the first basis vector in the horizontal dimension and the second basis vector in the vertical dimension; The n'1-th element in the first basis vector v is: and / or, The n'2-th element in the second basis vector u is: where j is the imaginary unit, λ represents the wavelength of the wireless signal, and d x represents the antenna spacing in the horizontal dimension of the first antenna array, and D x represents the length of the first antenna array in the horizontal dimension, and d z represents the antenna spacing in the vertical dimension of the first antenna array, and D z represents the length of the first antenna array in the vertical dimension.

9. The method according to claim 8, wherein N1 = N3 and O1 = O3, the n'1-th element in the first basis vector v It is: and / or, N2 = N4 and O2 = O4, the n'2-th element in the second basis vector u It is:

10. The method according to claim 4, wherein Multiple first angle parameters are distributed in K first angle parameter subsets, and the quantization offsets of the first distance parameters corresponding to the first angle parameters in different first angle parameter subsets are different; and / or, Multiple second angle parameters are distributed in K second angle parameter subsets, and the quantization offsets of the second distance parameters corresponding to the second angle parameters in different second angle parameter subsets are different.

11. The method according to claim 10, wherein The quantization offset of the first angular parameter corresponding to the first distance parameter in the first subset of angular parameters with index k is The first angular parameter in the first subset of angular parameters indexed by k corresponds to the first distance parameter and / or The quantization offset of the second angular parameter corresponding to the second distance parameter in the second subset of angular parameters indexed by k is The second angular parameter in the second subset of angular parameters indexed by k corresponds to the second distance parameter where 0 < k ≤ K and k is an integer.

12. The method according to claim 11, wherein K＝2， The first angle parameter and / or The second angle parameter 13. The method according to claim 12, wherein The n′1-th element in the first basis vector v is: and / or The n'2-th element in the second basis vector u is: where j is the imaginary unit, λ represents the wavelength of the wireless signal, and d x represents the antenna spacing in the horizontal dimension of the first antenna array, and D x represents the length in the horizontal dimension of the first antenna array, and d z represents the antenna spacing in the vertical dimension of the first antenna array, and D z represents the length in the vertical dimension of the first antenna array.

14. The method according to claim 13, wherein N1 = N3 and O1 = O3, the n'1-th element in the first basis vector v is: and / or N2 = N4 and O2 = O4, the n'2-th element in the second base vector u is:

15. The method according to any one of claims 4 to 14, characterized in that The first information includes at least one of the following: A first indication field for indicating a first angle parameter corresponding to the first codeword; A second indication field for indicating a second angle parameter corresponding to the first codeword; A third indication field for indicating a first distance parameter corresponding to the first codeword; A fourth indication field for indicating a second distance parameter corresponding to the first codeword.

16. The method according to claim 15, wherein The first indication field at least includes bits; The second indication field at least includes bits; The third indication field at least includes bits; The fourth indication field at least includes bits.

17. The method according to claim 15, wherein The first indication field at least includes bits; The second indication field at least includes bits; The third indication field at least includes bits; The fourth indication field at least includes bits.

18. The method according to any one of claims 1-17, characterized in that, The first codebook is used for single-polarization single-layer transmission; or, The first codebook is used for dual-polarization multi-layer transmission, and the first codebook is constructed based on the angle parameter, the distance parameter, and the co-phase coefficient.

19. The method according to claim 18, characterized in that The method further includes: The terminal sends second information to the network device, and the second information is used to indicate the co-phase coefficient corresponding to the first codeword.

20. The method according to any one of claims 19-20, characterized in that The co-phase coefficient includes at least one of the following: Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and Octal Phase Shift Keying (8-PSK).

21. A communication method, characterized in that, The method includes: The network device receives first information sent by the terminal, where the first information is used to indicate a first codeword, the first codeword is a codeword in a first codebook, the first codebook is obtained based on an angle parameter set and a distance parameter set, and the first codebook is a codebook used by the terminal in the near-field region of the first antenna array.

22. The method according to claim 21, wherein The first antenna array is any one of the following: a Uniform Linear Array (ULA); a Uniform Planar Array (UPA).

23. The method according to any one of claims 21-22, characterized in that, The first antenna array includes N1 antenna ports in the horizontal dimension and N2 antenna ports in the vertical dimension, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1.

24. The method according to any one of claims 21-23, wherein The angle parameter includes: At least one first angle parameter, which is obtained by quantizing the horizontal dimension angle domain in the near-field region according to the number of antenna ports N1 in the horizontal dimension and the oversampling factor O1 of the horizontal dimension angle domain; and / or, At least one second angle parameter, which is obtained by quantizing the vertical dimension angle domain in the near-field region according to the number of antenna ports N2 in the vertical dimension and the oversampling factor O2 of the vertical dimension angle domain; The distance parameter includes: At least one first distance parameter, which is obtained by quantizing the horizontal dimension distance domain in the near-field region according to the number of sampling points N3 in the horizontal dimension and the oversampling factor O3 of the horizontal dimension distance domain; and / or, At least one second distance parameter, which is obtained by quantizing the vertical dimension distance domain in the near field region according to the number of sampling points N4 in the vertical dimension and the oversampling factor O4 of the vertical dimension distance domain.

25. The method according to claim 24, wherein the multiple first distance parameters are distributed in K first distance parameter subsets, and the quantization offsets of the first angle parameters corresponding to the first distance parameters distributed in different first distance parameter subsets are different; and / or, the multiple second distance parameters are distributed in K second distance parameter subsets, and the quantization offsets of the second angle parameters corresponding to the second distance parameters distributed in different second distance parameter subsets are different.

26. The method according to claim 25, wherein The quantization offset of the first distance parameter corresponding to the first angle parameter in the first subset of distance parameters with index k is The first distance parameter in the first subset of distance parameters indexed by k corresponds to the first angle parameter and / or, The quantization offset of the second distance parameter corresponding to the second angle parameter in the second distance parameter subset indexed by k is The second distance parameter in the second subset of distance parameters with index k corresponds to the second angular parameter where 0 ≤ k ≤ K - 1 and k is an integer.

27. The method according to claim 26, wherein K＝2， the first distance parameter and / or, the second distance parameter 28. The method according to claim 27, wherein the basis vectors of the first codebook are the Kronecker product of the first basis vectors in the horizontal dimension and the second basis vectors in the vertical dimension; The n′1-th element in the first basis vector v is: and / or, The n'2-th element in the second basis vector u It is: where j is the imaginary unit, λ represents the wavelength of the wireless signal, d x represents the antenna spacing in the horizontal dimension of the first antenna array, D x represents the length of the first antenna array in the horizontal dimension, d z represents the antenna spacing in the vertical dimension of the first antenna array, D z represents the length of the first antenna array in the vertical dimension.

29. The method according to claim 28, wherein N1 = N3 and O1 = O3, the n'1-th element in the first basis vector v is: and / or, N2 = N4 and O2 = O4, the n'2-th element in the second base vector u is:

30. The method according to claim 24, wherein the multiple first angle parameters are distributed in K first angle parameter subsets, and the quantization offsets of the first distance parameters corresponding to the first angle parameters distributed in different first angle parameter subsets are different; and / or, the multiple second angle parameters are distributed in K second angle parameter subsets, and the quantization offsets of the second distance parameters corresponding to the second angle parameters distributed in different second angle parameter subsets are different.

31. The method according to claim 30, wherein The quantization offset of the first angular parameter corresponding to the first distance parameter in the first subset of angular parameters with index k is The first angular parameter in the first subset of angular parameters indexed by k corresponds to the first distance parameter and / or, The quantization offset of the second angle parameter corresponding to the second distance parameter in the second angle parameter subset indexed by k is The second angular parameter in the second subset of angular parameters indexed by k corresponds to the second distance parameter where 0 < k ≤ K and k is an integer.

32. The method according to claim 31, wherein K＝2， The first angular parameter and / or, The second angle parameter 33. The method according to claim 32, wherein The n'1-th element in the first basis vector v is: and / or, The n'2-th element in the second basis vector u It is: where j is the imaginary unit, λ represents the wavelength of the wireless signal, and d x represents the antenna spacing in the horizontal dimension of the first antenna array, and D x represents the length in the horizontal dimension of the first antenna array, and d z represents the antenna spacing in the vertical dimension of the first antenna array, and D z represents the length in the vertical dimension of the first antenna array.

34. The method according to claim 33, wherein N1 = N3 and O1 = O3, the n'1-th element in the first basis vector v is: and / or, N2 = N4 and O2 = O4, the n'2-th element in the second basis vector u is:

35. The method according to any one of claims 24-34, characterized in that, the first information includes at least one of the following: a first indication field for indicating the first angle parameter corresponding to the first codeword; a second indication field for indicating the second angle parameter corresponding to the first codeword; a third indication field for indicating the first distance parameter corresponding to the first codeword; a fourth indication field for indicating the second distance parameter corresponding to the first codeword.

36. The method according to claim 35, wherein The first indication field at least includes bits; The second indication field at least includes bits; The third indication field at least includes bits; The fourth indication field at least includes bits.

37. The method according to claim 35, wherein The first indication field at least includes bits; The second indication field at least includes bits; The third indication field at least includes bits; The fourth indication field at least includes bits.

38. The method according to any one of claims 21 - 37, characterized in that, The first codebook is used for single-polarization single-layer transmission; or, the first codebook is used for dual-polarization multi-layer transmission, and the first codebook is constructed based on the angle parameter, the distance parameter, and the co-phase coefficient.

39. The method according to claim 38, wherein The method further includes: the network device receives second information sent by the terminal, and the second information is used to indicate the co-phase coefficient corresponding to the first codeword.

40. The method according to any one of claims 19-20, characterized in that, The co-phase coefficient includes at least one of the following: Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and 8-Phase Shift Keying (8-PSK).

41. A terminal, characterized in that, The terminal includes: A processing module, configured to determine a first codeword in a first codebook, where the first codebook is obtained based on a set of angle parameters and a set of distance parameters, and the first codebook is a codebook used by the terminal when it is in the near-field region of the first antenna array; A transceiver module, configured to send first information to the network device, where the first information is used to indicate the first codeword.

42. A network device, characterized in that, The network device includes: A transceiver module, configured to receive the first information sent by the terminal, where the first information is used to indicate a first codeword, the first codeword is a codeword in a first codebook, the first codebook is obtained based on a set of angle parameters and a set of distance parameters, and the first codebook is a codebook used by the terminal when it is in the near-field region of the first antenna array.

43. A terminal, characterized in that, Comprising: One or more processors; A memory coupled to the one or more processors, where the memory includes executable instructions that, when executed by the one or more processors, cause the terminal to perform the communication method according to any one of claims 1-20.

44. A network device, characterized in that, Comprising: One or more processors; A memory coupled to the one or more processors, where the memory includes executable instructions that, when executed by the one or more processors, cause the network device to perform the communication method according to claims 21-40.

45. A communication system, characterized in that, Comprising a terminal and a network device, where the terminal is configured to implement the communication method according to any one of claims 1-20, and the network device is configured to implement the communication method according to any one of claims 21-40.

46. A storage medium storing instructions, characterized in that, When the instruction runs on the communication device, it causes the communication device to perform the communication method according to any one of claims 1-20 or claims 21-40.

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