WO2025145459A1 - Communication method, terminal, network device, communication system and storage medium - Google Patents

Abstract

A communication method, a terminal, a network device, a communication system and a storage medium. The method comprises: a terminal determining a first codeword in a first codebook, wherein the first codebook is obtained on the basis of an angle parameter set and a distance parameter set, and the first codebook is a codebook used when the terminal is located in a near-field region of a first antenna array; and the terminal sending first information to a network device, wherein the first information is used for indicating the first codeword. A first codeword determined by a terminal can better match wireless propagation characteristics of a near-field region, thereby improving the transmission performance of the near-field region.

Description

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

The present disclosure relates to the field of communication technology, and in particular to a communication method, a terminal, a network device, a communication system and a storage medium.

Background Art

Multiple-Input Multiple-Output (MIMO) technology effectively improves the capacity and throughput of the system by introducing multi-antenna technology. 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.

Summary of the invention

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

According to a first aspect of an embodiment of the present disclosure, a communication method is proposed, the method comprising:

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 a first antenna array;

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

According to a second aspect of an embodiment of the present disclosure, a communication method is proposed, the method comprising:

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 where the first codebook is a codebook used when the terminal is in a near field area of a first antenna array.

According to a third aspect of an embodiment of the present disclosure, a terminal is provided, the terminal including:

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 by the terminal in a near field area of a first antenna array;

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

According to a fourth aspect of an embodiment of the present disclosure, a network device is provided, wherein the network device includes:

A transceiver module is used 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 where the first codebook is a codebook used when the terminal is in a near field area of a first antenna array.

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

one or more processors;

A memory coupled to the one or more processors, the memory comprising executable instructions, and when the executable instructions are executed by the one or more processors, the terminal executes the communication method described in the first aspect.

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

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, causes the network device to execute the communication method described in the second aspect.

According to the seventh aspect of an embodiment of the present disclosure, a communication system is proposed, including 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.

According to an eighth aspect of an embodiment of the present disclosure, a storage medium is proposed, wherein the storage medium stores instructions, and 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.

In the above implementation, 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

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

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

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

FIG. 1C is an exemplary schematic diagram of a first antenna array provided according to an embodiment of the present disclosure.

FIG. 2A is an exemplary interaction diagram of a communication method provided according to an embodiment of the present disclosure.

FIG. 2B is an exemplary schematic diagram of rectangular quantization provided according to an embodiment of the present disclosure.

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

FIG. 3A is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

FIG. 3B is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

FIG. 4A is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

FIG. 4B is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

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

FIG. 6 is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

FIG. 7A is a schematic diagram of an exemplary structure of a terminal provided according to an embodiment of the present disclosure.

FIG. 7B is a schematic diagram of an exemplary structure of a network device provided according to an embodiment of the present disclosure.

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

FIG8B is a schematic diagram of an exemplary structure of a communication device provided according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

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

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 a first antenna array;

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

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 in the near-field area, and the angle parameters and distance parameters corresponding to the first codeword are fed back 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.

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

In the above embodiment, the first codebook can be applicable to a uniform linear array or a uniform planar array antenna array, so that a terminal located in such an antenna array can achieve more reliable near-field area transmission based on the first codebook.

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.

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

In combination with some embodiments of the first aspect, 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 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, the second angle parameter is obtained by quantizing 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;

The distance parameters include:

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 according to the number of sampling points in the horizontal dimension N ₃ and the oversampling factor of the horizontal dimension distance domain O ₃ ; 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 according to the number of sampling points in the vertical dimension N ₄ and the oversampling factor of the vertical dimension distance domain O ₄ .

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, and a plurality of discrete angle parameters and distance parameters can be obtained, thereby effectively reducing the number of codewords in the first codebook.

In combination with some embodiments of the first aspect, in some embodiments, a plurality of the 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 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.

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, so that each codeword in the first codebook can cover a larger area in the polarization domain, and the number of codewords can be reduced while ensuring the communication quality.

In combination 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.

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

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

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′ ₂ th element in the second basis vector u for: Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array.

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.

In conjunction with some embodiments of the first aspect, in some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for: and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

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 first distance parameters corresponding to 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 second distance parameters corresponding to second angle parameters distributed in different second angle parameter subsets are different.

In the above embodiment, 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 different, so that each codeword in the first codebook can cover a larger area in the polarization domain, and the number of codewords can be reduced while ensuring the communication quality.

In combination 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 indexed by k is The first angle parameter in the first angle parameter subset indexed by 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 indexed by k is The second angle parameter in the second angle parameter subset indexed by k corresponds to the second distance parameter Wherein, 0<k≤K and k is an integer.

In conjunction with some embodiments of the first aspect, in some embodiments, K=2, the first angle parameter And/or, the second angle parameter

In combination with some embodiments of the first aspect, in some embodiments, the n′ _1th element in the first basis vector v is for: and/or, the n′ ₂ th element in the second basis vector u for: Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array.

In conjunction with some embodiments of the first aspect, in some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for: and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

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 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.

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.

In combination with some embodiments of the first aspect, in some embodiments, 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.

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

In combination with some embodiments of the first aspect, in some embodiments, 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.

In combination with some embodiments of the first 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.

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.

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 eight phase shift keying (8-PSK).

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.

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.

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.

In combination with some embodiments of the second aspect, 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 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, the second angle parameter is obtained by quantizing 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;

The distance parameters include: 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 horizontal 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. The oversampling factor O ₄ is obtained by quantizing the vertical dimension distance domain in the near field region.

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 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.

In combination 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.

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

In combination 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′ ₂ th element in the second basis vector u for: Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array.

In conjunction with some embodiments of the second aspect, in some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for: and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

In combination with some embodiments of the second aspect, in some embodiments, a plurality of the first angle parameters are distributed in K first angle parameter subsets, and the quantized offsets of the first distance parameters corresponding to the first angle parameters distributed in different first angle parameter subsets are not Same; and/or,

The plurality of 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.

In combination 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 indexed by k is The first angle parameter in the first angle parameter subset indexed by 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 indexed by k corresponds to the second distance parameter Wherein, 0<k≤K and k is an integer.

In conjunction with some embodiments of the second aspect, in some embodiments, K=2, the first angle parameter And/or, the second angle parameter

In conjunction with some embodiments of the second aspect, in some embodiments, the n′ _1th element in the first basis vector v is for: and/or, the n′ ₂ th element in the second basis vector u for:

Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array.

In conjunction with some embodiments of the second aspect, in some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for: and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

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

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

In conjunction with some embodiments of the second aspect, in some embodiments, 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.

In conjunction with some embodiments of the second aspect, in some embodiments, 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.

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.

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, and the second information is used to indicate a common phase coefficient corresponding to the first codeword.

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.

In a third aspect, an embodiment of the present disclosure provides a terminal, wherein the terminal includes:

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 by the terminal in a near field area of a first antenna array;

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

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

A transceiver module is used 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 where the first codebook is a codebook used when the terminal is in a near field area of a first antenna array.

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, and when the executable instructions are executed by the one or more processors, the terminal executes the communication method in the first aspect.

In a 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, and when the executable instructions are executed by the one or more processors, the network device executes the communication method in the second aspect.

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.

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.

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.

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.

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

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 execute the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods, which will not be repeated here.

The embodiments of the present disclosure provide a communication method, a terminal, a network device, a communication system, and a storage medium. In some embodiments, the terms such as communication method, codebook determination method, codeword reporting method, etc. can be replaced with each other, the terms such as communication device, codebook determination device, codeword reporting device, etc. can be replaced with each other, and the terms such as information processing system, communication system, etc. can be replaced with each other.

The embodiments of the present disclosure are not exhaustive, but are only 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 of the steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

In each embodiment of the present disclosure, unless otherwise specified or there is a logical conflict, the terms and/or descriptions between the embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form a new embodiment based on their internal logical relationships.

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.

In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular form, such as "a", "an", "the", "above", "said", "aforementioned", "this", 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 after the article may be understood as a singular expression or a plural expression.

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

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

In some embodiments, "at least one of A and B", "A and/or B", "A in one case, B in another case", "in response to one case A, in response to another case B", etc., may include the following technical solutions according to 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); in some embodiments, A and B (both A and B are executed). When there are more branches such as A, B, C, etc., the above is also similar.

In some embodiments, the recording method of "A or B" may include the following technical solutions according to 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). When there are more branches such as A, B, C, etc., the above is also similar.

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 restrictions on the position, order, priority, quantity or content of the description objects. The statement of the description object refers to the description in the context of the claims or embodiments, and should not constitute unnecessary restrictions 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", and the "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 the "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes may be the same or different. For example, if the description object is "device", then the "first device" and the "second device" may be the same device or different devices, and their types may be the same or different. For another example, if the description object is "information", then the "first information" and the "second information" may be the same information or different information, and their contents may be the same or different.

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.

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

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.

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 lower 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", "no more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

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.

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

In some embodiments, “access network device (AN device)”, “radio access network device (RAN device)”, “base station (BS)”, “radio base station (radio base station)”, “fixed station (fixed station)”, “node (node)”, “access point (access point)”, “transmission point (TP)”, “reception point (RP)”, “transmission and/or reception point (transmission/reception point, TRP)”, The terms "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", and "bandwidth part (BWP)" are used interchangeably.

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 and the like can be used interchangeably.

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 access network device, the core network device, or the network device and the communication between the terminals is replaced by the communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a 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.

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 also be configured to have a structure that has all or part of the functions of the terminal.

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

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

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

1A 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).

As shown in FIG1A , 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.

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 (Pad), 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 to these.

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 Node B (eNB), a next generation evolved Node B (ng-eNB), a next generation Node B (gNB), a node B (NB), a home node B (HNB), a home evolved node B (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.

In some embodiments, the technical solution of the present disclosure may be applicable to the Open RAN architecture. In this case, the interfaces between access network devices or within access network devices involved in the embodiments of the present disclosure may become internal interfaces of Open RAN, and the processes and information interactions between these internal interfaces may be implemented through software or programs.

In some embodiments, the access network device may be composed of a centralized unit (central unit, CU) and a distributed unit (distributed unit, DU), wherein the CU may also be called a control unit (control unit). The CU-DU structure may be used to split the protocol layer of the access network device, with some functions of the protocol layer being centrally controlled by the CU, and the remaining part or all of the functions of the protocol layer being distributed in the DU, and the DU being centrally controlled by the CU, but not limited to this.

In some embodiments, the core network device may be a device including a first network element, a second network element, etc., or may be a plurality of devices. The core network includes, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

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. A person of ordinary skill in the art 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.

The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG. 1A or part of the subject, but are not limited thereto. The subjects shown in FIG. 1A are examples, and the communication system may include all or part of the subjects in FIG. 1A, or may include other subjects other than FIG. 1A, and the number and form of the subjects are arbitrary, and the subjects may be physical or virtual, and the connection relationship between the subjects is an example, and the subjects may be connected or disconnected, and the connection may be in any manner, and may be a direct connection or an indirect connection, and may be a wired connection or a wireless connection.

The embodiments of the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth 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 ... The present invention relates to wireless communication systems such as LTE, Wi-Fi (X), 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) network, Device to Device (D2D) system, Machine to Machine (M2M) system, Internet of Things (IoT) system, Vehicle to Everything (V2X), systems using other communication methods, and next-generation systems expanded based on them. In addition, a combination of multiple systems (for example, a combination of LTE or LTE-A with 5G, etc.) may also be applied.

In some embodiments, the network device 102 may be a network device in an extremely large scale multiple input multiple output (XL-MIMO) system, and the network device 102 may include a first antenna array, which may be used for the network device to send a wireless signal to a terminal. Optionally, the type of the first antenna array may include, but is not limited to: a uniform linear array; a uniform planar array.

In some embodiments, the radiation range of the antenna array can be divided into a near-field region and a far-field region, the boundary 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.

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 N ₁ equal to 7 and N ₂ equal to 1, and the spacing between each antenna port can be d _x . With the antenna port with an index of 0 in the horizontal dimension of the first antenna array as the origin (0, 0), the coordinates of the antenna port with an index of n ₁ in the horizontal dimension can be (n ₁ d _x ,0), where n ₁ is an integer and satisfies n ₁ ∈{-(N ₁ -1)/2,…,0,…(N ₁ -1)/2}. The length of the antenna array in the horizontal dimension is D _x , which can be expressed as D _x =N ₁ d _x or D _x =(N ₁ -1)d _x .

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.

The distance between the antenna port indexed by _n1 in the first antenna array and the terminal can be calculated as: According to Taylor's formula, the above formula is approximated by second-order Taylor expansion, so the distance between the antenna with index n ₁ in the antenna array and the UE can be approximately calculated as:

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

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 an 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 may be _dx , and the spacing between the antenna ports in the vertical dimension may be _dz . Taking the antenna port whose horizontal and vertical dimension indexes are both 0 in the first antenna array as the origin (0, 0, 0), the coordinates of the antenna whose horizontal and vertical dimension indexes are (n ₁ , n ₂ ) in the antenna array are (n ₁ d _x , 0, n ₂ d _z ), where n ₁ and n ₂ are integers and satisfy n ₁ ∈ {-(N ₁ -1)/2,…, 0,…(N ₁ -1)/2} and n ₂ ∈ {-(N ₂ -1)/2,…, 0,…(N ₂ -1)/2}.

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 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 location of 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.

The distance between the antenna port indexed as (n ₁ , n ₂ ) in the first antenna array and the terminal can be calculated as: According to Taylor's formula, the above formula is approximated by second-order Taylor expansion, so the distance between the antenna indexed (n ₁ ,n ₂ ) in the antenna array and the terminal can be approximately calculated as:

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

In some embodiments, only the far-field region is considered, and the channel model and codebook design are only for far-field MIMO. With the substantial increase in the antenna array and the increase in the 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, the propagation form of electromagnetic waves is spherical waves, while in the far-field region, the propagation form of electromagnetic waves is plane waves, so the codebook design designed for the far-field region cannot guarantee the quality of communication in the near-field region.

It is worth noting that the first antenna arrays in FIG. 1B and FIG. 1C are merely exemplary, and the number of antenna ports in the first antenna array may be less than or greater than the number of antenna ports shown in FIG. 1B or FIG. 1C, and the embodiments of the present disclosure do not limit this. For example, the first antenna array may be an antenna array having 64 ports in both the horizontal and vertical dimensions.

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

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

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

In some embodiments, the terminal determines a first codeword in a first codebook. Optionally, the terminal determines the first codeword in the first codebook according to a measurement result. Optionally, the terminal determines that the terminal is in a near field area of a first antenna array according to the measurement result, and determines the first codeword in the first codebook.

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. Further, the terminal may traverse each codeword in the first codebook to obtain the optimal first codeword.

It can be understood that the near field area of the first antenna array may refer to a short distance between the terminal and the antenna array. 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 Ruili distance, it can be determined that the terminal is in the near field area of the first antenna array.

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

In some embodiments, the first antenna array is an antenna array for the network device to transmit wireless signals to the terminal. For example, the network device can precode the data in the data stream according to the codeword in the first codebook, so that the wireless signal sent by the network device can be accurately and reliably received by the terminal in the near field area.

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.

Among them, the angle parameter set may include various angles of the near-field area of the first antenna array in the angle domain or the indexes corresponding to each angle, the distance parameter set may include various distances of the near-field area of the first antenna array in the distance domain or the indexes 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.

Optionally, the first codebook includes a plurality of codewords corresponding to each angle and each distance in the near field region, or the basis vectors of the first codebook include basis vectors corresponding to each angle and each distance 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.

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 embodiments of the present disclosure.

In some embodiments, the first antenna array includes N ₁ antenna ports in the horizontal dimension and N ₂ antenna ports in the vertical dimension, where N ₁ is greater than or equal to 1 and N ₂ is greater than or equal to 1.

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.

It can be understood that when _N1 or _N2 is equal to 1 and the spacing between each antenna port is the same, the first antenna array can be a uniform linear array, and when _N1 and/or _N2 is greater than 1 and the spacing between each antenna port is the same, the first antenna array can be a uniform planar array. The spacing of the antenna ports in the horizontal dimension can be expressed as _dx , and the spacing in _the vertical dimension can be expressed as _dz . The horizontal dimension length of the antenna array can be expressed as _Dx , where _Dx = _N1dx or _Dx = ( _N1-1 ) _dx , or other representations, which are not limited in the embodiments of the present disclosure. The vertical dimension length of _the antenna array can be expressed as _Dz , where _Dz = _N2dz or _Dz = ( _N2-1 ) _dz , or other representations, which are not limited in the embodiments of the present disclosure.

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 angle domain of the horizontal dimension in the near-field area according to the number of antenna ports _N1 in the horizontal dimension and the oversampling factor _O1 of the angle domain of the horizontal dimension; and at least one second angle parameter, which is obtained by quantizing the angle domain of the vertical dimension in the near-field area according to the number of antenna ports _N2 in the vertical dimension and the oversampling factor _O2 of the angle domain of the vertical dimension.

The first angle parameter may be the angle domain cosθ of the horizontal dimension 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 obtained by quantizing 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.

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.

It can be understood that when the first antenna array is a uniform linear array, the possible value of the horizontal angle domain or the vertical angle domain is unique. For example, the value of N ₁ O ₁ may be greater than 1 and the value of N ₂ O ₂ may be 1. In this case, the angle parameter may include N ₁ O ₁ first angle parameters and one second angle parameter, and the value of the second angle parameter is zero.

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.

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

In some embodiments, the _n′1th element of the first basis vector v for: The n′ _2nd element of the second basis vector u for:

Among them, n′ ₁ =n ₁ +(N ₁ +1) _/ 2, n′ ₂ =n ₂ +(N ₂ +1)/2, n ₁ represents the index of the antenna port in the horizontal dimension, and n ₂ 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, o ₁ represents the first distance angle parameter corresponding to the first basis vector, o ₂ represents the second distance parameter corresponding to the second basis vector, l = 0, 1,…, N ₁ O ₁ -1, m = 0, 1,…, N 2 O 2 -1, o 1 = 1, 2,…, N ₃ O ₃ , o ₂ = 1, ₂ ,…, N ₄ O ₄ ; j is _an 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, and D _z represents the length of the first antenna array in the vertical dimension.

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.

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 a rectangle.

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

Referring to FIG. 2B and FIG. 2C, the circles in the figure may represent quantization points, and each quantization point may correspond to a precoding matrix or a codeword. In FIG. 2B, a "rectangular quantization" method is adopted, that is, the polarization domain is quantized according to a rectangular area, that is, any codeword can be used to quantize the channel in the corresponding rectangular area, that is, the range covered by any precoding matrix is a rectangle. In FIG. 2C, a "hexagonal quantization" scheme is adopted, that is, the range covered by any precoding matrix is a rectangle.

For example, referring to FIG. 2B and FIG. 2C , assuming that the quantization interval of the distance domain in the “rectangular quantization” in FIG. 2B is 2d, the total number of quantization points is N ₃ O ₃ , and the quantization interval of the distance domain in the “hexagonal quantization” is The total number of quantization points is X, so we only need to ensure This means that when using hexagonal quantization, the distance between any codeword and the center is equal to 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.

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.

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.

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 value of the first distance parameter in each first distance parameter subset may be an arithmetic progression.

In some embodiments, the first distance parameter in the first distance parameter subset indexed by k corresponds to a quantized offset of the first angle parameter. for 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.

Optionally, K=2, the first distance parameter

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,…,N ₁ O ₁ -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 At this time, the first angle parameter corresponding to the first distance parameter subset is

In some embodiments, the _n′1th element in the first basis vector v for:

Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the length in the horizontal dimension of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the length in the vertical dimension of the first antenna array.

In some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for:

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.

Optionally, for an odd-numbered first distance parameter, the corresponding first angle parameter l∈{0,1,…,N ₁ O ₁ -1}, and for an even-numbered first distance parameter, the corresponding first angle parameter Alternatively, for an even-numbered first distance parameter, the corresponding first angle parameter l∈{0,1,…,N ₁ O ₁ -1}; for an odd-numbered first distance parameter, the corresponding first angle parameter

For example, when N ₃ =N ₁ =64 and O ₃ =O ₁ =4, then When o ₁ ∈{1,3,…,241} and o ₁ is When l∈{0,1,…,255} is an odd number, when o ₁ ∈{2,4,…,242} and o ₁ is an even number, Or, when o ₁ ∈ {2, 4, …, 242} and o ₁ is even, l ∈ {0, 1, …, 255}, and when o ₁ ∈ {1, 3, …, 241} and o ₁ is odd,

In some embodiments, a plurality of the 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.

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.

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.

Optionally, K=2, the second distance parameter

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 may be 0 or 1. When k is 0, the second distance parameter in the second distance parameter subset may 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 corresponding second angle parameter m∈{0,1,…,N ₂ O ₂ -1} of the second distance parameter subset; when k is 1, the second distance parameter in the second distance parameter subset may be less than or equal to The quantization offset of the second angle parameter corresponding to the second distance parameter subset is At this time, the second angle parameter corresponding to the second distance parameter subset is

In some embodiments, 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, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the length in the horizontal dimension of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the length in the vertical dimension of the first antenna array.

In some embodiments, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

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.

Optionally, for an odd-numbered second distance parameter, the corresponding second angle parameter m∈{0,1,…,N ₂ O ₂ -1}, and 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,…,N ₂ O ₂ -1}; for an odd-numbered second distance parameter, the corresponding second angle parameter

For example, when N ₄ =N ₂ =64 and O ₄ =O ₂ =4, then When o ₂ ∈{1,3,…,241} and o ₂ is an odd number, m∈{0,1,…,255}, when o ₂ ∈{2,4,…,242} and o ₂ is an even number, Or, when o ₂ ∈ {2,4,…,242} and o ₂ is even, m ∈ {0,1,…,255}, and when o ₂ ∈ {1,3,…,241} and o ₂ is odd,

In some embodiments, the plurality of 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.

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 value of the first angle parameter in each first angle parameter subset may be an arithmetic progression.

In some embodiments, the quantized offset of the first distance parameter corresponding to the first angle parameter in the first angle parameter subset indexed by k is The first angle parameter in the first angle parameter subset indexed by k corresponds to the second angle parameter Wherein, 0<k≤K and k is an integer.

Optionally, K=2, the first angle parameter

For example, when K is 2, that is, the number of the 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 is 1, the first angle parameter in the first angle parameter subset can be less than or equal to The quantization offset of the first distance parameter corresponding to the first angle parameter subset is 0. At this time, the first distance parameter o ₁ ∈{1,…,N ₃ O ₃ -1} corresponding to the first angle parameter subset; when k is 2, the first angle parameter in the first angle parameter subset may be less than or equal to The quantization offset of the first distance parameter corresponding to the first angle parameter subset is At this time, the first distance parameter corresponding to the first angle parameter subset

In some embodiments, the _n′1th element in the first basis vector v for:

Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the length in the horizontal dimension of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the length in the vertical dimension of the first antenna array.

In some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for:

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

Optionally, for an odd-numbered first angle parameter, the corresponding first distance parameter o ₁ ∈{1,…,N ₁ O ₁ -1}, and for an even-numbered first angle parameter, the corresponding second angle parameter Alternatively, for an even-numbered first angle parameter, the corresponding second angle parameter o ₁ ∈{1,…,N ₁ O ₁ -1}; for an odd-numbered first angle parameter, the corresponding second angle parameter

For example, when N ₃ =N ₁ =64 and O ₃ =O ₁ =4, then When l∈{1,3,…,241} and l is an odd number, o ₁ ∈{1,…,255}, when l∈{2,4,…,242} and l is an even number, Or, when l∈{1,3,…,241} and l is even, o ₁ ∈{1,…,255}, when l∈{2,4,…,242} and l is odd,

In some embodiments, the plurality of 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.

The multiple second angle parameters may be uniformly distributed, for example, the number of second angle parameters in each second angle parameter subset is the same, and the value of the second angle parameter in each second angle parameter subset may be an arithmetic progression.

In some embodiments, the quantized offset of the second distance parameter corresponding to the second angle parameter in the second angle parameter subset indexed by k is The second angle parameter in the second angle parameter subset indexed by k corresponds to the second angle parameter Wherein, 0<k≤K and k is an integer.

Optionally, K=2, the second angle parameter

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 o ₂ ∈{1,…,N ₄ O ₄ -1} corresponding to the second angle parameter subset; when k is 2, the second angle parameter in the second angle parameter subset may 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

In some embodiments, 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, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array.

In some embodiments, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

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.

Optionally, for an odd-numbered second angle parameter, the corresponding second distance parameter o ₂ ∈{1,…,N ₂ O ₂ -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 o ₂ ∈{1,…,N ₂ O ₂ -1}; for an odd-numbered second angle parameter, the corresponding second distance parameter

For example, when N ₄ =N ₂ =64 and O ₄ =O ₂ =4, then When m∈{1,3,…,241} and m is an odd number, o ₂ ∈{1,…,255}, when m∈{2,4,…,242} and m is an even number, Or, when m∈{1,3,…,241} and m is even, o ₂ ∈{1,…,255}, when m∈{2,4,…,242} and m is odd,

It is understandable that the first angle parameter can be divided into a plurality of first angle parameter sets, and the second angle parameter can be divided into a plurality of second angle parameter sets, wherein the number of the plurality of first angle parameter sets and the number of the plurality of second angle parameter sets can be the same or different, and the embodiments of the present disclosure do not limit this. 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 value or different values.

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 N ₁ =N ₃ , N ₂ =N ₄ , O ₁ =O ₃ and O ₂ =O ₄ , it can be determined that the horizontal dimension basis vector and the vertical dimension basis vector of the first codebook can be expressed as: When N ₃ =N ₁ =64, N ₄ =N ₂ =64, O ₃ =O ₁ =4 and O ₂ =O ₂ =4,

Similarly, the first distance parameter can be divided into multiple first distance parameter sets, and the second distance parameter can be divided into multiple second distance parameter sets, wherein 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 the embodiments of the present disclosure do not limit this. 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 value or different values.

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

In some embodiments, the first codebook is constructed based on the angle parameter, the distance parameter and the common phase coefficient. Optionally, the first codebook is constructed based on the first basis vector and 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.

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

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 common phase coefficient, and the common phase coefficient corresponds to the number of layers of the dual-polarization multi-layer transmission.

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 may be determined based on the first angle parameter and the first distance parameter, and the second basis vector may be determined based on the second angle parameter and the second distance parameter.

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

In combination with some of the above embodiments, the first codebook may 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 may be constructed based on the common phase coefficient by calculating the Kronecker product for each first basis vector and each second basis vector.

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 [1, -1], and in the case of 8PSK, the common phase coefficient can be Any one of eight values. Optionally, the near-field codebook may include a codeword constructed based on each angle parameter, each distance parameter, and each common phase coefficient.

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

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, and then obtain the first codeword.

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

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 a 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.

Among them, the distance parameter corresponding to the first codeword can be the first distance parameter and the second distance parameter determined by the terminal, and the angle parameter corresponding to the first codeword can be the most matching first angle parameter and the second angle parameter determined by the terminal.

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.

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.

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.

For example, if the number of angle parameters in the horizontal dimension and the vertical dimension of the near-field codebook is N ₁ O ₁ =N ₂ O ₂ =4 and the number of distance parameters in the horizontal dimension and the vertical dimension is N ₃ O ₃ =N ₄ O ₄ =4, the first indication field, the second indication field, the third indication field and the fourth indication field can respectively 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.

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.

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".

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.

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".

It can be understood that when the first antenna array is a uniform linear array, the terminal does not need to feed back 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 domain and the third indication domain. When the terminal is in the near field area in only one dimension of the horizontal dimension or the vertical dimension, the terminal may only feed back relevant parameters of the dimension in the near field area in the first basis vector that best matches the terminal. For example, the first antenna array is a uniform planar array, and the terminal is in the near field area only in the horizontal dimension. The terminal can determine that the first information includes the first indication domain, the second indication domain, and the third indication domain.

In some embodiments, the network device receives the first information. Optionally, the network device determines the first codeword according to the first information. Optionally, the network device determines the best matching first basis vector and second basis vector determined by the terminal according to the first information, and determines the first codeword according to the best matching first basis vector and the best matching second basis vector.

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.

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.

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

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

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; when N is 3, the second information is used to indicate that the common phase coefficient corresponding to the first codeword is 8-PSK.

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 [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.

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, and when the value of the bit is 0, the common phase coefficient corresponding to the first codeword may be -1.

In some embodiments, the network device receives the second information. Optionally, the network device determines the codebook corresponding to the first codeword for dual-polarization multi-layer number according to the second information. Optionally, the network device determines the first codeword according to the first information and the second information.

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, which is the first codeword determined by the terminal.

In some embodiments, the first information and the second information may be the same information, for example, different fields in the same information. Optionally, the first information and the second information may also be different information, for example, carried by different information elements. This disclosure embodiment does not limit this.

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.

In combination with some of the above-mentioned 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.

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.

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

It can be understood that the terminal can also construct a first codebook that is used only when either the horizontal dimension or the distance dimension is in the near field area, and can also construct a first codebook corresponding to a uniform linear array. The specific implementation method can be found in the description in the above embodiment and will not be repeated here.

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

In some embodiments, the terms "codebook", "codeword", "precoding matrix" and the like can be interchangeable. For example, a codebook can be a collection of one or more codewords/precoding matrices.

In some embodiments, terms such as "uplink", "uplink", "physical uplink" can be interchangeable, and terms such as "downlink", "downlink", "physical downlink" can be interchangeable, and terms such as "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" can be interchangeable.

In some embodiments, the terms "downlink control information (DCI)", "downlink (DL) assignment (assignment)", "DL DCI", "uplink (UL) grant (grant)", "UL DCI" and so on can be used interchangeably.

In some embodiments, terms such as "physical downlink shared channel (PDSCH)", "DL data" and the like can be interchangeable, and terms such as "physical uplink shared channel (PUSCH)", "UL data" and the like can be interchangeable.

In some embodiments, terms such as "moment", "time point", "time", and "time position" can be interchangeable, and terms such as "duration", "period", "time window", "window", and "time" can be interchangeable.

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

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 are interchangeable.

In some embodiments, the terms "frame", "radio frame", "subframe", "slot", "sub-slot", "mini-slot", "symbol", "symbol", "transmission time interval (TTI)" and so on can be used interchangeably.

In some embodiments, "obtain", "obtain", "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 high levels, obtaining by self-processing, autonomous implementation, etc.

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

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

In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), 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 to this.

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 the data; "not expecting to send" can be interpreted as not sending, or as sending but not expecting the recipient to respond to the sent content.

The communication method involved in the embodiment 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 are not limited thereto.

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

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

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.

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

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

Step S3101: determine a first codeword in a first codebook.

The optional implementation of step S3101 can refer to the optional implementation of step S2101 in FIG. 2A and other related parts in the embodiment involved in FIG. 2A , which will not be described in detail here.

Step S3102, sending the first information.

The optional implementation of step S3102 can refer to the optional implementation of step S2102 in FIG. 2A and other related parts in the embodiment involved in FIG. 2A , which will not be described in detail here.

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.

Step S3103, sending the second information.

The optional implementation of step S3102 can refer to the optional implementation of step S2102 in FIG. 2A and the implementation involved in FIG. 2A. Other related parts in the embodiment will not be repeated here.

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.

The communication method involved in the embodiment of the present disclosure may include at least one of step S3101 to step 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 are not limited thereto.

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

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

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.

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), and the method includes:

Step S3201: determine a first codeword in a first codebook.

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

Step S3202, sending the first information.

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.

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, and the first antenna array is an antenna array for a network device to transmit a wireless signal to the terminal;

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

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

In some embodiments, the first antenna array includes N ₁ antenna ports in the horizontal dimension and N ₂ antenna ports in the vertical dimension, where N ₁ is greater than or equal to 1 and N ₂ is greater than or equal to 1.

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;

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 according to the number of sampling points N ₃ in the horizontal dimension and the oversampling factor O ₃ 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 according to the number of sampling points N ₄ in the vertical dimension and the oversampling factor O ₄ of the vertical dimension distance domain.

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,

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.

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.

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

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′ ₂ th element in the second basis vector u for: Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the length in the horizontal dimension of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the length in the vertical dimension of the first antenna array.

In some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for: and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

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

In some embodiments, the quantized offset of the first distance parameter corresponding to the first angle parameter in the first angle parameter subset indexed by k is The first angle parameter in the first angle parameter subset indexed by 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 indexed by k corresponds to the second distance parameter Wherein, 0<k≤K and k is an integer.

In some embodiments, K=2, the first angle parameter and/or, a second angle parameter

In some embodiments, the _n′1th element in the first basis vector v for: and/or, the n′ ₂ th element in the second basis vector u for: Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the length in the horizontal dimension of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the length in the vertical dimension of the first antenna array.

In some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for: and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

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.

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.

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.

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 common phase coefficient.

In some embodiments, the method further includes: the terminal sends second information to the network device, where the second information is used to indicate a common phase coefficient corresponding to the first codeword.

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

FIG4A is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4A , the embodiment of the present disclosure relates to a communication method (network device side), and the method includes:

Step S4101, obtaining first information.

The optional implementation of step S4101 can refer to the optional implementation of step S2101 in FIG. 2A and other related parts in the embodiment involved in FIG. 2A , which will not be described in detail here.

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.

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

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

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

Step S4102, obtaining second information.

The optional implementation of step S4101 can refer to the optional implementation of step S2101 in FIG. 2A and other related parts in the embodiment involved in FIG. 2A , which will not be described in detail here.

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.

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

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

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

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.

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

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

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

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

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), and the method includes:

Step S4201, obtaining first information.

The optional implementation of step S4201 can refer to step S2101 in FIG. 2A , the optional implementation of step S4101 in FIG. 4A , and other related parts in the embodiment involved in FIG. 2A , which will not be described in detail here.

In some embodiments, 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 constructed based on an angle parameter set and a distance parameter set, 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 for the network device to transmit wireless signals to the terminal.

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

In some embodiments, the first antenna array includes N ₁ antenna ports in the horizontal dimension and N ₂ antenna ports in the vertical dimension, where N ₁ is greater than or equal to 1 and N ₂ is greater than or equal to 1.

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;

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 according to the number of sampling points N ₃ in the horizontal dimension and the oversampling factor O ₃ 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 according to the number of sampling points N ₄ in the vertical dimension and the oversampling factor O ₄ of the vertical dimension distance domain.

In some embodiments, a 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 a 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. The offset is different.

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.

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

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′ ₂ th element in the second basis vector u for: Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the length in the horizontal dimension of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the length in the vertical dimension of the first antenna array.

In some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for: and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

In some embodiments, the plurality of 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.

In some embodiments, the first angle parameter in the first angle parameter subset indexed by k corresponds to a quantized offset of the first distance parameter. for The first angle parameter in the first angle parameter subset indexed by 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 indexed by k corresponds to the second distance parameter Wherein, 0<k≤K and k is an integer.

In some embodiments, K=2, the first angle parameter and/or, a second angle parameter

In some embodiments, the _n′1th element in the first basis vector v for: and/or, the n′ ₂ th element in the second basis vector u for:

Wherein, j is an imaginary unit, λ represents the wavelength of the wireless signal, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the length in the horizontal dimension of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the length in the vertical dimension of the first antenna array.

In some embodiments, N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for: and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:

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 a 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; a fourth indication field, the fourth indication field is used to indicate a second distance parameter corresponding to the first codeword.

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.

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.

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 common phase coefficient.

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.

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

FIG5 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG5 , the embodiment of the present disclosure relates to a communication method, and the method includes:

Step S5101: The terminal determines a first codeword in a first codebook.

The optional implementation method of step S5101 can refer to the optional implementation method 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.

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

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

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

FIG6 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG6 , the embodiment of the present disclosure relates to a communication method, and the method includes:

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

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 a wireless signal to the terminal.

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

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:

Wherein N ₁ and N ₃ represent the number of sampling points in the horizontal dimension angle domain and the horizontal dimension distance domain respectively, O ₁ and O ₃ represent the oversampling factors in the horizontal dimension angle domain and the horizontal dimension distance domain respectively, l＝0,1,…,N ₁ O ₁ -1 and o ₁ ＝1,2,…,N ₃ O ₃ .

At this time, the indication information of the precoding matrix includes l = 0, 1, ..., N ₁ O ₁ -1 and o ₁ = 1, 2, ..., N ₃ O ₃ (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 (o ₁ , K) = k, The integer K is a preconfigured parameter, 0≤k≤K-1 and k is an integer, and the specific value range of the index o ₁ can be calculated according to different situations.

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

In some embodiments, referring to FIG. 2B and FIG. 2C , the circles in the figures may represent quantization points, and each quantization point may be In FIG2B , a "rectangular quantization" method is used for a precoding matrix or a codeword, that is, the polarization domain is quantized according to a rectangular area, that is, any codeword can be used to quantize the channel in the corresponding rectangular area, that is, the range covered by any precoding matrix is a rectangle. In FIG2C , a "hexagonal quantization" scheme is used, that is, the range covered by any precoding matrix is a rectangle.

Assume that the quantization interval of the distance domain in "rectangular quantization" is 2d, the total number of quantization points is N ₃ O ₃ , and the quantization interval of the distance domain in "hexagonal quantization" is The total number of quantization points is X, so we only need to ensure This means that when using hexagonal quantization, the distance between any codeword and the center is equal to that of rectangular quantization. To ensure that the performance of hexagonal quantization is better than or equal to that of rectangular quantization, we only need

At this time, the feedback coefficient can be designed as follows: Case 1: When When o ₁ is an odd number, l＝0,1,…,N ₁ O ₁ -1; when When o ₁ is an even number, Case 2: When When o ₁ is an odd number, when And when o ₁ is an even number, l＝0,1,…,N ₁ O ₁ -1.

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

Assume that the antenna spacing in the horizontal dimension of the antenna array is Horizontal dimension of antenna array When N ₁ =N ₃ and O ₁ =O ₃ , the precoding vector can be calculated as: When N ₃ = N ₁ = 64 and O ₃ = O ₁ = 4, then

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

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

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:

Wherein N ₁ , N ₂ , N ₃ and N ₄ represent the number of sampling points of the horizontal dimension angle domain, vertical dimension angle domain, horizontal dimension distance domain and vertical dimension distance domain respectively, O ₁ , O ₂ , O ₃ and O ₄ represent the oversampling factors of the horizontal dimension angle domain, vertical dimension angle domain, horizontal dimension distance domain and vertical dimension distance domain respectively, l＝0,1,…,N ₁ O ₁ -1, m＝0,1,…,N ₂ O ₂ -1, o ₁ ＝1,2,…,N ₃ O ₃ and o ₂ ＝1,2,…,N ₄ O ₄ .

At this time, the indication information of the precoding matrix includes l=0,1,…,N ₁ O ₁ -1, m=0,1,…,N ₂ O ₂ -1, o ₁ =1,2,…,N ₃ O ₃ and o ₂ =1,2,…,N ₄ O ₄ (and common phase coefficients). In order to reduce the number of precoding matrices and potentially reduce 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(o ₁ ,K)=k, The integer K is a pre-configured parameter, 0≤k≤K-1 and k is an integer. The specific value range of the index o ₁ can be calculated according to different situations. When mod(o ₂ ,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 o ₂ can be calculated according to different situations. The K in the horizontal dimension and the vertical dimension can also be configured to different values.

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

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

Case 1: When When o ₁ is an odd number, l＝0,1,…,N ₁ O ₁ -1; when When o ₁ is an even number, Case 2: When When o ₁ is an odd number, when And when o ₁ is an even number, l＝0,1,…,N ₁ O ₁ -1.

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

Case 1: When When o ₂ is an odd number, m＝0,1,…,N ₂ O ₂ -1; When it is an even number, Case 2: When When o ₂ is an odd number, when And when o ₂ is an even number, m＝0,1,…,N ₂ O ₂ -1.

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

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

For example, suppose the antenna array has horizontal and vertical antenna spacings of The horizontal and vertical lengths of the antenna array are and And taking N ₁ =N ₃ , N ₂ =N ₄ , O ₁ =O ₃ and O ₂ =O ₄ , the precoding vectors v and u can be calculated as:

Among them, when N ₃ =N ₁ =64, N ₄ =N ₂ =64, O ₃ =O ₁ =4 and O ₂ =O ₂ =4, then

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

pass Bit indication l = 0, ... N ₁ O ₁ -1, using broadband or sub-band feedback; Bit indication m = 0, ... N ₂ O ₂ -1, using broadband or sub-band feedback; Bit Indication Using broadband or sub-band feedback; Bit Indication Broadband 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 broadband or sub-band feedback is adopted.

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

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

The embodiments of the present disclosure also propose a device for implementing any of the above methods, for example, a device is proposed, the above device includes a unit or module for implementing each step performed by the terminal in any of the above methods. For another example, another device is also proposed, including a unit or module for implementing each step performed by a network device (such as 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.

It should be understood that the division of the units or modules in the above device is only a division of logical functions, which can be fully or partially integrated into one physical entity or physically separated in actual implementation. In addition, the units or modules in the device can 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 instructions are stored in the memory. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the 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 inside the device or a memory outside the device. Alternatively, the units or modules in the device may be implemented in the form of hardware circuits, and the functions of some or all of the units or modules may be implemented by designing the hardware circuits. The hardware circuits may be understood as one or more processors; for example, in one implementation, the hardware circuits are application-specific integrated circuits (ASICs), and the functions of some or all of the above units or modules may be implemented by designing the logical relationship of the components in the circuits; for another example, in another implementation, the hardware circuits may be implemented by programmable logic devices (PLDs), and Field Programmable Gate Arrays (FPGAs) may be used as an example, which may include a large number of logic gate circuits, and the connection relationship between the logic gate circuits may be configured by configuring the configuration files, thereby implementing the functions of some or all of the above units or modules. All units or modules of the above devices may be implemented in the form of software called by the processor, or in the form of hardware circuits, or in the form of software called by the processor, and the remaining part may be implemented in the form of hardware circuits.

In the disclosed embodiments, the processor is a circuit with signal processing capability. In one implementation, the processor may be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which may be understood as a microprocessor), or a digital signal processor (DSP); in another implementation, the processor may implement certain functions through the logical relationship of a hardware circuit, and the logical relationship of the above hardware circuit may be fixed or reconfigurable, such as 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 to implement the hardware circuit configuration may 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 ASIC, such as Neural Network Processing Unit (NPU), Tensor Processing Unit (TPU), Deep Learning Processing Unit (DPU), etc.

FIG7A is a schematic diagram of the structure of the terminal proposed in an embodiment of the present disclosure. As shown in FIG7A, the terminal 7100 may include: at least one of a transceiver module 7101, a processing module 7102, etc. 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, wherein 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 a network device to transmit a wireless signal to the terminal; the transceiver module 7101 is used to send a first message to the network device, and the first message is used to indicate a first codeword. Optionally, the transceiver module 7101 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 thereto) executed by the terminal in any of the above methods, which will not be repeated here. Optionally, the processing module 7102 is used to execute at least one of the other steps (for example, step S2101) executed by the terminal in any of the above methods, which will not be repeated here.

FIG7B is a schematic diagram of the structure of a network device proposed in an embodiment of the present disclosure. As shown in FIG7B , 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 the first information sent by the terminal, the first information is used to indicate the first codeword, the first codeword is a codeword in the first codebook, the first codebook is constructed based on the angle parameter set and the distance parameter set, the first codebook is the codebook used by the terminal in the near field area of the first antenna array, and the first antenna array is the antenna array for the network device to transmit a wireless signal to the terminal. Optionally, the transceiver module 7201 is used to perform 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 perform at least one of the other steps performed by the network device in any of the above methods, which will not be repeated here.

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

In some embodiments, the processing module can be a module or include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be replaced with the processor.

FIG8A is a schematic diagram of the structure of a communication device 8100 proposed in an embodiment of the present disclosure. The communication device 8100 may be a network device (e.g., an access network device, a core network device, etc.), or a terminal (e.g., a user device, etc.), or 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. The communication device 8100 may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment.

As shown in FIG8A , the communication device 8100 includes one or more processors 8101. The processor 8101 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to control the communication protocol and the communication 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 a program, and process the data of the program. 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 so that the communication device 8100 performs any of the above methods.

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, 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 the transmitter may be separated or integrated together. Optionally, the terms such as transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, interface, etc. may be replaced with each other, the terms such as transmitter, transmitting unit, transmitter, transmitting circuit, etc. may be replaced with each other, and the terms such as receiver, receiving unit, receiver, receiving circuit, etc. may be replaced with each other.

In some embodiments, the communication device 8100 further includes one or more memories 8103 for storing data. Optionally, all or part of the memories 8103 may also be outside the communication device 8100. In an optional embodiment, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuit 8104 is connected to the memory 8103, and the interface circuit 8104 may be used to receive data from the memory 8103 or other devices, and may be used to send data to the memory 8103 or other devices. For example, the interface circuit 8104 may read the data stored in the memory 8103 and send the data to the processor 8101.

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 and 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, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

8B is a schematic diagram of the structure of a chip 8200 provided in an embodiment of the present disclosure. In the case where the communication device 8100 may be a chip or a chip system, reference may be made to the schematic diagram of the structure of the chip 8200 shown in FIG8B , but the present disclosure is not limited thereto.

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

In some embodiments, the chip 8200 further includes one or more interface circuits 8202. Optionally, the terms interface circuit, interface, transceiver pin, etc. can be interchangeable. In some embodiments, the chip 8200 further includes one or more memories 8203 for storing data. Optionally, all or part of the memory 8203 can be outside the chip 8200. Optionally, the interface circuit 8202 is connected to the memory 8203, and the interface circuit 8202 can be used to receive data from the memory 8203 or other devices, and the interface circuit 8202 can be used to send data to the memory 8203 or other devices. For example, the interface circuit 8202 can read the data stored in the memory 8203 and send the data to the processor 8201.

In some embodiments, the interface circuit 8202 performs at least one of the communication steps such as sending and/or receiving in the above method (for example, step S2102, step S2103, but not limited thereto). The interface circuit 8202 performs the communication steps such as sending and/or receiving in the above method, for example, means that the interface circuit 8202 performs data interaction between the processor 8201, the chip 8200, the memory 8203, or the transceiver device. In some embodiments, the processor 8201 performs at least one of the other steps (for example, step S2101, but not limited thereto).

The modules and/or devices described in the embodiments such as virtual devices, physical devices, chips, etc. can be combined or separated as needed. Optionally, some or all steps can also be performed by multiple modules and/or devices in collaboration, which is not limited here.

The present disclosure also proposes a storage medium, on which instructions are stored, and when the instructions are executed on the communication device 8100, the communication device 8100 executes 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 to this, and it can also be a storage medium readable by other devices. Optionally, the storage medium can be a non-transitory storage medium, but is not limited to this, and it can also be a temporary storage medium.

The present disclosure also proposes a program product, which, when executed by the communication device 8100, enables the communication device 8100 to execute any of the above methods. Optionally, the program product is a computer program product.

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

Claims (46)

A communication method, characterized in that the method comprises: 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 a first antenna array; The terminal sends first information to the network device, where the first information is used to indicate the first codeword. The method according to claim 1 is characterized in that the first antenna array is any one of the following: a uniform linear array; a uniform planar array. The method according to any one of claims 1-2 is characterized in that the first antenna array includes _N1 antenna ports in the horizontal dimension and _N2 antenna ports in the vertical dimension, wherein _N1 is greater than or equal to 1, and _N2 is greater than or equal to 1. The method according to any one of claims 1 to 3, characterized in that The angle parameters include: at least one first angle parameter, wherein 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 N ₁ in the horizontal dimension and the oversampling factor O ₁ in 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 N ₂ of antenna ports in the vertical dimension and an oversampling factor O ₂ of the vertical dimension angle domain; The distance parameters include: at least one first distance parameter, wherein 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 N ₃ in the horizontal dimension and the oversampling factor O ₃ 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 N ₄ in the vertical dimension and an oversampling factor O ₄ of the vertical dimension distance domain. The method according to claim 4, characterized in that 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, 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. The method according to claim 5, characterized in that 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. The method according to claim 6, characterized in that K=2, The first distance parameter and/or, The second distance parameter The method according to claim 7, characterized in that the basis vector of the first codebook is a first basis vector of the horizontal dimension Kronecker product with 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, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array. The method according to claim 8, characterized in that N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for:
and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:
The method according to claim 4, characterized in that The plurality of 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 plurality of 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. The method according to claim 10, characterized in that The quantized 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 indexed by k corresponds to the first distance parameter and/or, The quantized offset of the second distance parameter corresponding to the second angle parameter in the second angle parameter subset indexed by k is The second angle parameter in the second angle parameter subset indexed by k corresponds to the second distance parameter Wherein, 0<k≤K and k is an integer. The method according to claim 11, characterized in that K=2, The first angle parameter and/or, The second angle parameter The method according to claim 12, characterized in that 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, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array. The method according to claim 13, characterized in that N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for:
and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:
The method according to any one of claims 4 to 14, wherein the first information includes at least one of the following: 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, the third indication field is used to indicate a first distance parameter corresponding to the first codeword; A fourth indication field, where the fourth indication field is used to indicate a second distance parameter corresponding to the first codeword. The method according to claim 15, characterized in that 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. The method according to claim 15, characterized in that 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. The method according to any one of claims 1 to 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 common phase coefficient. The method according to claim 18, characterized in that the method further comprises: The terminal sends second information to the network device, where the second information is used to indicate a common phase coefficient corresponding to the first codeword. The method according to any one of claims 19-20, characterized in that 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. A communication method, characterized in that the method comprises: 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 where the first codebook is a codebook used when the terminal is in a near field area of a first antenna array. The method according to claim 21 is characterized in that the first antenna array is any one of the following: a uniform linear array; a uniform planar array. The method according to any one of claims 21-22 is characterized in that the first antenna array includes _N1 antenna ports in the horizontal dimension and _N2 antenna ports in the vertical dimension, wherein _N1 is greater than or equal to 1, and _N2 is greater than or equal to 1. The method according to any one of claims 21 to 23, characterized in that The angle parameters include: at least one first angle parameter, wherein 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 N ₁ in the horizontal dimension and the oversampling factor O ₁ in 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 N ₂ of antenna ports in the vertical dimension and an oversampling factor O ₂ of the vertical dimension angle domain; The distance parameters include: at least one first distance parameter, wherein 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 N ₃ in the horizontal dimension and the oversampling factor O ₃ 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 N ₄ in the vertical dimension and an oversampling factor O ₄ of the vertical dimension distance domain. The method according to claim 24, characterized in that 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, 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. The method according to claim 25, characterized in that 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. The method according to claim 26, characterized in that K=2, The first distance parameter and/or, The second distance parameter The method according to claim 27, characterized in that 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, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array. The method according to claim 28, characterized in that N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for:
and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:
The method according to claim 24, characterized in that The plurality of 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 plurality of 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. The method according to claim 30, characterized in that The quantized 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 indexed by k corresponds to the first distance parameter and/or, The quantized offset of the second distance parameter corresponding to the second angle parameter in the second angle parameter subset indexed by k is The second angle parameter in the second angle parameter subset indexed by k corresponds to the second distance parameter Wherein, 0<k≤K and k is an integer. The method according to claim 31, characterized in that K=2, The first angle parameter and/or, The second angle parameter The method according to claim 32, characterized in that 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, _dx represents the antenna spacing in the horizontal dimension of the first antenna array, _Dx represents the horizontal dimension length of the first antenna array, _dz represents the antenna spacing in the vertical dimension of the first antenna array, and _Dz represents the vertical dimension length of the first antenna array. The method according to claim 33, characterized in that N ₁ =N ₃ and O ₁ =O ₃ , the n′ _1th element in the first basis vector v for:
and/or, N ₂ =N ₄ and O ₂ =O ₄ , the n′ ₂ th element in the second basis vector u for:
The method according to any one of claims 24 to 34, wherein the first information includes at least one of the following: 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, the third indication field is used to indicate a first distance parameter corresponding to the first codeword; A fourth indication field, where the fourth indication field is used to indicate a second distance parameter corresponding to the first codeword. The method according to claim 35, characterized in that 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. The method according to claim 35, characterized in that 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. The method according to any one of claims 21 to 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 common phase coefficient. The method according to claim 38, characterized in that the method further comprises: 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. The method according to any one of claims 19-20, characterized in that 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. A terminal, characterized in that the terminal comprises: 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 by the terminal in a near field area of a first antenna array; The transceiver module is used to send first information to the network device, where the first information is used to indicate the first codeword. A network device, characterized in that the network device comprises: A transceiver module is used 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 where the first codebook is a codebook used when the terminal is in a near field area of a first antenna array. A terminal, characterized by comprising: one or more processors; A memory coupled to the one or more processors, the memory comprising executable instructions, and when the one or more processors execute the executable instructions, the terminal executes the communication method according to any one of claims 1 to 20. 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, cause the network device to execute the communication method described in claims 21-40. A communication system, characterized in that it includes a terminal and a network device, wherein the terminal is configured to implement the communication method described in any one of claims 1-20, and the network device is configured to implement the communication method described in any one of claims 21-40. A storage medium storing instructions, characterized in that when the instructions are executed on a communication device, the communication device executes the communication method as described in any one of claims 1-20 or claims 21-40.