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

Abstract

A communication method, a terminal, a network device, a communication system and a storage medium. The method comprises: a terminal determining that the terminal is located in a near-field region, and determining a first codeword in a near-field codebook, wherein the near-field codebook is determined on the basis of a candidate first basis vector, and the candidate first basis vector is a basis vector used for the near-field region; 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

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

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

[0003] Summary of the Invention

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

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

[0006] The terminal determines that the terminal is in a near-field area, and determines a first codeword in a near-field codebook, where the near-field codebook is determined based on a candidate first basis vector, where the candidate first basis vector is a basis vector used for the near-field area;

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

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

[0009] The network device receives first information sent by the terminal, where the first information is used to indicate a first codeword, where the first codeword is a codeword in a near-field codebook, where the near-field codebook is determined based on candidate first basis vectors, and where the candidate first basis vectors are basis vectors used for the near-field area.

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

[0011] a processing module, configured to determine that the terminal is in a near-field area, and determine a first codeword in a near-field codebook, wherein the near-field codebook is determined based on a candidate first basis vector, where the candidate first basis vector is a basis vector used in the near-field area;

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

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

[0014] A transceiver module is configured to receive first information sent by a terminal, where the first information is used to indicate a first codeword, where the first codeword is a codeword in a near-field codebook, where the near-field codebook is determined based on candidate first basis vectors, where the candidate first basis vectors are basis vectors used for the near-field area.

[0015] According to a fifth aspect of an embodiment of the present disclosure, a communication method is provided. The method is applied to a communication system, the communication system including a terminal and a network device, and the method includes:

[0016] The terminal determines that the terminal is in a near-field area, and determines a first codeword in a near-field codebook, where the near-field codebook is determined based on candidate first basis vectors, where the candidate first basis vectors are basis vectors used in the near-field area.

[0017] According to a sixth aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0018] one or more processors;

[0019] A memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, causes the terminal to execute the communication method described in the first aspect.

[0020] According to a seventh aspect of an embodiment of the present disclosure, a network device is provided, including:

[0021] one or more processors;

[0022] 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.

[0023] According to an eighth aspect of an embodiment of the present disclosure, a communication system is proposed, comprising a terminal and a network device, wherein the terminal is configured to implement the communication method described in the first aspect, and the network device is configured to implement the communication method described in the second aspect.

[0024] According to a ninth aspect of an embodiment of the present disclosure, a storage medium is proposed, wherein the storage medium stores instructions. When the instructions are executed on a communication device, the communication device executes the communication method as described in the first aspect or the second aspect.

[0025] In the above embodiment, the candidate first basis vector can be introduced based on the candidate second basis vector used by the terminal in the far-field area to construct a near-field codebook, so that the near-field codebook after the introduction of the candidate first basis vector can be reliably used for near-field transmission between the terminal and the network device, and 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

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0027] FIG1A is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure.

[0028] FIG1B is an exemplary schematic diagram of a first antenna array provided according to an embodiment of the present disclosure.

[0029] FIG1C is an exemplary schematic diagram of a first antenna array provided according to an embodiment of the present disclosure.

[0030] FIG2 is an exemplary interaction diagram of a communication method provided according to an embodiment of the present disclosure.

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

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

[0033] FIG3C is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0034] FIG4A is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0035] FIG4B is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0036] FIG4C is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0037] FIG5 is an exemplary interaction diagram of a communication method provided according to an embodiment of the present disclosure.

[0038] FIG6 is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0039] FIG7A is a schematic diagram of an exemplary structure of a terminal provided according to an embodiment of the present disclosure.

[0040] FIG7B is a schematic diagram of an exemplary structure of a network device provided according to an embodiment of the present disclosure.

[0041] FIG8A is a schematic diagram of an exemplary structure of a communication device provided according to an embodiment of the present disclosure.

[0042] FIG8B is a schematic diagram of an exemplary structure of a communication device provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] The embodiments of the present disclosure provide a communication method, a terminal, a network device, a communication system, and a storage medium.

[0044] In a first aspect, an embodiment of the present disclosure provides a communication method, the method comprising:

[0045] The terminal determines that the terminal is in a near-field area, and determines a first codeword in a near-field codebook, where the near-field codebook is determined based on a candidate first basis vector, where the candidate first basis vector is a basis vector used for the near-field area;

[0046] The terminal sends first information to a network device, where the first information is used to indicate the first codeword.

[0047] In the above embodiment, the candidate first basis vector can be introduced based on the candidate second basis vector used by the terminal in the far-field area to construct a near-field codebook, so that the near-field codebook after the introduction of the candidate first basis vector can be reliably used for near-field transmission between the terminal and the network device, and 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.

[0048] In combination with some embodiments of the first aspect, in some embodiments, the near-field codebook is determined based on the candidate first basis vector and the candidate second basis vector, and the candidate second basis vector is the basis vector of the codebook used when the terminal is in the far-field area.

[0049] In the above embodiment, by multiplying the candidate first basis vectors by the second basis vectors, a near-field codebook that is more consistent with the near-field transmission characteristics can be reliably obtained.

[0050] In conjunction with some embodiments of the first aspect, in some embodiments, the candidate first basis vectors include basis vectors of a horizontal dimension and basis vectors of a vertical dimension, and the candidate first basis vectors are the Kronecker product of the basis vectors of the horizontal dimension and the basis vectors of the vertical dimension in the candidate first basis vectors;

[0051] The candidate second basis vectors include basis vectors in the horizontal dimension and basis vectors in the vertical dimension, and the candidate second basis vectors are the Kronecker products of the basis vectors in the horizontal dimension and the basis vectors in the vertical dimension among the candidate second basis vectors.

[0052] In combination with some embodiments of the first aspect, in some embodiments, the number of antenna ports in the horizontal dimension of the first antenna array of the network device is N1, and the number of antenna ports in the vertical dimension is N2, where N1 is greater than or equal to 1, and N2 is greater than or equal to 1.

[0053] In combination with some embodiments of the first aspect, in some embodiments, the candidate first basis vector is determined based on distance parameters, and the distance parameters include at least one first distance parameter in the horizontal dimension and at least one second distance parameter in the vertical dimension.

[0054] The n′1th element in the horizontal dimension of the basis vector v″ of the candidate first basis vector for:

[0055] The n′2th element in the vertical dimension basis vector u″ of the candidate first basis vector for:

[0056] Wherein, n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension, n′1=n1+(N1+1) / 2, n′2=n2+(N2+1) / 2;

[0057] o1 represents the first distance parameter corresponding to the candidate first basis vector, o2 represents the second distance parameter corresponding to the candidate first basis vector, O3 represents the oversampling factor of the distance parameter in the horizontal dimension, O4 represents the oversampling factor of the distance parameter in the vertical dimension, o1=1, 2, ..., N3O3, o2=1, 2, ..., N4O4;

[0058] j is an imaginary unit, λ represents the wavelength of the wireless signal, d x Denotes the horizontal antenna spacing of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D x Denotes the horizontal dimension length of the first antenna array, D z Represents the vertical dimension length of the first antenna array.

[0059] In the embodiment of the present disclosure, based on the above formula and the distance parameter of the horizontal dimension and the distance parameter of the vertical dimension, the candidate first basis vectors corresponding to each distance parameter can be accurately determined, and then the corresponding near-field codebook can be constructed to ensure near-field transmission performance.

[0060] In conjunction with some embodiments of the first aspect, in some embodiments, and The n′1th element in the horizontal dimension of the basis vector v″ of the candidate first basis vector for: The n′2th element in the vertical dimension basis vector u″ of the candidate first basis vector for:

[0061] In combination with some embodiments of the first aspect, in some embodiments, the candidate second basis vector is determined based on an angle parameter, wherein the angle parameter includes a first angle parameter of at least one horizontal dimension and a second angle parameter of at least one vertical dimension, and the n′1th element in the basis vector v′ of the horizontal dimension in the candidate second basis vector is for: The n′2th element in the vertical dimension of the candidate second basis vector u′ for: Among them, l represents the first angle parameter corresponding to the candidate second basis vector, m represents the second angle parameter corresponding to the candidate second basis vector, O1 represents the oversampling factor of the angle parameter in the horizontal dimension, O2 represents the oversampling factor of the angle parameter in the vertical dimension, l = 0, 1, ..., N1O1-1, m = 0, 1, ..., N2O2-1.

[0062] In the embodiment of the present disclosure, based on the above formula and the angle parameters of the horizontal dimension and the vertical dimension, the candidate second basis vectors corresponding to each angle parameter can be accurately determined, and then the corresponding near-field codebook can be constructed to ensure near-field transmission performance.

[0063] In combination with some embodiments of the first aspect, in some embodiments, the first information includes at least one of the following: a first indication field, the first indication field is used to indicate the first angle parameter corresponding to the first codeword; a second indication field, the second indication field is used to indicate the second angle parameter corresponding to the first codeword; a third indication field, the third indication field is used to indicate the first distance parameter corresponding to the first codeword; and a fourth indication field, the fourth indication field is used to indicate the second distance parameter corresponding to the first codeword.

[0064] In an embodiment of the present disclosure, the terminal can accurately report the angle parameters and distance parameters of the horizontal dimension and / or vertical dimension corresponding to the first codeword through the first information, so that the network device can accurately obtain the first codeword determined by the terminal based on the first information, and perform near-field transmission based on the first codeword, which can effectively improve the reliability of near-field transmission.

[0065] In conjunction with some embodiments of the first aspect, in some embodiments, the first indication field at least includes bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0066] In the above embodiment, the smallest indication field can be used to implement various parameter indications, which can effectively reduce the resource overhead of the first code feedback.

[0067] In combination with some embodiments of the first aspect, in some embodiments, the candidate second basis vectors are the same as discrete Fourier transform DFT basis vectors in a downlink DL Type 1 codebook.

[0068] In the above embodiment, there is no need to additionally design candidate second basis vectors, and the design of the near-field codebook can be further implemented without affecting the existing far-field codebook.

[0069] In combination with some embodiments of the first aspect, in some embodiments, the terminal is determined to be in the near-field area of ​​the first antenna array, including at least one of the following: the terminal is determined to be in the near-field area only in the horizontal dimension; the terminal is determined to be in the near-field area only in the vertical dimension; the terminal is determined to be in the near-field area in both the horizontal dimension and the vertical dimension.

[0070] In the above embodiment, when the terminal meets any of the above conditions, it can be determined that the terminal is in the near-field area, and then the corresponding near-field codebook and codeword are determined, thereby ensuring the reliability of near-field transmission.

[0071] In combination with some embodiments of the first aspect, in some embodiments, the near-field codebook includes at least one of the following: a first near-field codebook, wherein the first near-field codebook is a codebook used by the terminal only when the horizontal dimension is in the near-field area; a second near-field codebook, wherein the second near-field codebook is a codebook used by the terminal only when the vertical dimension is in the near-field area; and a third near-field codebook, wherein the third near-field codebook is a codebook used when the terminal is in the near-field area in both the horizontal and vertical dimensions.

[0072] In the above embodiment, corresponding codebooks can be designed based on different states of the terminal in the near field area, so that the terminal can still determine codewords with better performance in different states, thereby improving the quality of near field communication.

[0073] In conjunction with some embodiments of the first aspect, in some embodiments, the near-field codebook is used for single-polarization single-layer transmission; or,

[0074] The near-field codebook is used for dual-polarization multi-layer transmission.

[0075] In the above embodiment, the near-field codebook can be further designed based on the common phase coefficient, so that the near-field codebook can be used for dual-polarization multi-layer transmission, which effectively improves the flexibility of the near-field codebook.

[0076] In conjunction with some embodiments of the first aspect, in some embodiments, the method includes:

[0077] 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.

[0078] In the above embodiment, the terminal can report the common phase coefficient corresponding to the first codeword to the network device by sending the second information, so that the network device can more accurately determine the codeword selected by the terminal based on the common phase coefficient, thereby improving the quality of communication with the terminal.

[0079] In conjunction with some embodiments of the first aspect, in some embodiments, the terminal determines the first codeword in the near-field codebook, including:

[0080] The terminal determines a first basis vector and a second basis vector;

[0081] The terminal determines the first codeword according to the first basis vector and the second basis vector.

[0082] In the above embodiment, the terminal can use the first basis vector and the second basis vector to determine the first codeword in the near-field codebook, thereby ensuring the quality of near-field communication between the terminal and the network device.

[0083] In conjunction with some embodiments of the first aspect, in some embodiments, the method includes:

[0084] The terminal determines that switching between the far-field area and the near-field area occurs, and sends third information to the network device, where the third information is used to indicate whether the second basis vector changes.

[0085] In the above embodiment, when switching between the far-field area and the near-field area, the third information can be used to indicate whether the second basis vector changes. In this way, when the second basis vector does not change, the terminal does not need to send the currently determined second basis vector, which can effectively reduce resource overhead.

[0086] In combination with some embodiments of the first aspect, in some embodiments, the terminal determines that switching between the far-field area and the near-field area occurs, including at least one of the following: the terminal determines that switching from the near-field area to the far-field area in the horizontal dimension; the terminal determines that switching from the near-field area to the far-field area in the vertical dimension; the terminal switches from the near-field area to the far-field area in both the horizontal dimension and the vertical dimension; the terminal determines that switching from the far-field area to the near-field area in the horizontal dimension; the terminal determines that switching from the far-field area to the near-field area in the vertical dimension; the terminal switches from the far-field area to the near-field area in both the horizontal dimension and the vertical dimension.

[0087] In a second aspect, an embodiment of the present disclosure provides a communication method, the method comprising:

[0088] 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 near-field codebook, where the near-field codebook is determined based on candidate first basis vectors, and where the candidate first basis vectors are basis vectors used for the near-field area.

[0089] In combination with some embodiments of the second aspect, in some embodiments, the near-field codebook is determined based on the candidate first basis vector and the candidate second basis vector, and the candidate second basis vector is a basis vector of the codebook used when the terminal is in the far-field area.

[0090] In conjunction with some embodiments of the second aspect, in some embodiments, the candidate first basis vectors include basis vectors of a horizontal dimension and basis vectors of a vertical dimension, and the candidate first basis vectors are the Kronecker product of the basis vectors of the horizontal dimension and the basis vectors of the vertical dimension in the candidate first basis vectors;

[0091] The candidate second basis vectors include basis vectors in the horizontal dimension and basis vectors in the vertical dimension, and the candidate second basis vectors are the Kronecker products of the basis vectors in the horizontal dimension and the basis vectors in the vertical dimension among the candidate second basis vectors.

[0092] In combination with some embodiments of the second aspect, in some embodiments, the number of antenna ports in the horizontal dimension of the first antenna array is N1, and the number of antenna ports in the vertical dimension is N2, where N1 is greater than or equal to 1, and N2 is greater than or equal to 1.

[0093] In conjunction with some embodiments of the second aspect, in some embodiments, the candidate first basis vector is determined based on distance parameters, and the distance parameters include at least one first distance parameter in the horizontal dimension and at least one second distance parameter in the vertical dimension.

[0094] The n′1th element in the horizontal dimension of the basis vector v″ of the candidate first basis vector for:

[0095] The n′2th element in the vertical dimension basis vector u″ of the candidate first basis vector for:

[0096] Wherein, n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension, n′1=n1+(N1+1) / 2, n′2=n2+(N2+1) / 2;

[0097] o1 represents the first distance parameter corresponding to the candidate first basis vector, o2 represents the second distance parameter corresponding to the candidate first basis vector, O3 represents the oversampling factor of the distance parameter in the horizontal dimension, O4 represents the oversampling factor of the distance parameter in the vertical dimension, o1=1, 2, ..., N3O3, o2=1, 2, ..., N4O4;

[0098] j is an imaginary unit, λ represents the wavelength of the wireless signal, d x Denotes the horizontal antenna spacing of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D x Denotes the horizontal dimension length of the first antenna array, D z Represents the vertical dimension length of the first antenna array.

[0099] In conjunction with some embodiments of the second aspect, in some embodiments, and

[0100] The n′1th element in the horizontal dimension of the basis vector v″ of the candidate first basis vector for:

[0101] The n′2th element in the vertical dimension basis vector u″ of the candidate first basis vector for:

[0102] In conjunction with some embodiments of the second aspect, in some embodiments, the candidate second basis vector is determined based on an angle parameter, where the angle parameter includes a first angle parameter of at least one horizontal dimension and a second angle parameter of at least one vertical dimension.

[0103] The n′1th element in the basis vector v′ of the horizontal dimension of the candidate second basis vector for:

[0104] The n′2th element in the vertical dimension of the candidate second basis vector u′ for:

[0105] Among them, l represents the first angle parameter corresponding to the candidate second basis vector, m represents the second angle parameter corresponding to the candidate second basis vector, O1 represents the oversampling factor of the angle parameter in the horizontal dimension, O2 represents the oversampling factor of the angle parameter in the vertical dimension, l = 0, 1, ..., N1O1-1, m = 0, 1, ..., N2O2-1.

[0106] In combination with some embodiments of the second aspect, in some embodiments, the first information includes at least one of the following: a first indication field, the first indication field is used to indicate the first angle parameter corresponding to the first codeword; a second indication field, the second indication field is used to indicate the second angle parameter corresponding to the first codeword; a third indication field, the third indication field is used to indicate the first distance parameter corresponding to the first codeword; and a fourth indication field, the fourth indication field is used to indicate the second distance parameter corresponding to the first codeword.

[0107] In conjunction with some embodiments of the second aspect, in some embodiments, the first indication field at least includes bits; the second indication field includes at least bits; the third indication field includes at least bits; the fourth indication field includes at least bits.

[0108] In combination with some embodiments of the second aspect, in some embodiments, the candidate second basis vectors are the same as the discrete Fourier transform DFT basis vectors in the downlink DL Type 1 codebook.

[0109] In combination with some embodiments of the second aspect, in some embodiments, the terminal is in the near-field area of ​​the first antenna array, including at least one of the following: the terminal is in the near-field area only in the horizontal dimension; the terminal is in the near-field area only in the vertical dimension; the terminal is in the near-field area in both the horizontal dimension and the vertical dimension.

[0110] In conjunction with some embodiments of the second aspect, in some embodiments, the near-field codebook includes at least one of the following:

[0111] a first near-field codebook, where the first near-field codebook is a codebook used by the terminal only when the terminal is in the near-field area in the horizontal dimension;

[0112] a second near-field codebook, where the second near-field codebook is a codebook used by the terminal only when the terminal is in the near-field area in a vertical dimension;

[0113] A third near-field codebook is used by the terminal when both the horizontal dimension and the vertical dimension are in the near-field area.

[0114] In conjunction with some embodiments of the second aspect, in some embodiments, the near-field codebook is used for single-polarization single-layer transmission; or,

[0115] The near-field codebook is used for dual-polarization multi-layer transmission.

[0116] In conjunction with some embodiments of the second aspect, in some embodiments, the method includes:

[0117] 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.

[0118] In conjunction with some embodiments of the second aspect, in some embodiments, the method includes:

[0119] The network device receives third information sent by the terminal, where the third information is used to indicate whether the second basis vector is changed.

[0120] In a third aspect, an embodiment of the present disclosure provides a terminal, comprising:

[0121] a processing module, configured to determine a near-field region in a first antenna array, and determine a first codeword in a near-field codebook, wherein the near-field codebook is determined based on candidate first basis vectors, where the candidate first basis vectors are basis vectors used for the near-field region;

[0122] The transceiver module is used to send first information to the network device, where the first information is used to indicate the first codeword.

[0123] In a fourth aspect, an embodiment of the present disclosure provides a network device, comprising:

[0124] A transceiver module is configured to receive first information sent by a terminal, where the first information is used to indicate a first codeword, where the first codeword is a codeword in a near-field codebook, where the near-field codebook is determined based on a candidate first basis vector, where the candidate first basis vector is a basis vector used for the near-field area.

[0125] In a fifth aspect, an embodiment of the present disclosure proposes a terminal comprising: one or more processors; a memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, enables the terminal to execute the communication method in the first aspect.

[0126] In the sixth aspect, an embodiment of the present disclosure proposes a network device, comprising: one or more processors; a memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, enables the network device to execute the communication method in the second aspect.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] In an eleventh aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first and second aspects above.

[0132] In a twelfth aspect, an embodiment of the present disclosure provides a communication method, which is applied to a communication system, the communication system including a terminal and a network device, and the method including:

[0133] The terminal determines that the terminal is in a near-field area, and determines a first codeword in a near-field codebook, where the near-field codebook is determined based on candidate first basis vectors, where the candidate first basis vectors are basis vectors used in the near-field area.

[0134] In conjunction with some embodiments of the twelfth aspect, in some embodiments, the method includes:

[0135] The terminal sends first information to the network device; wherein the first information is used to indicate the first codeword, or the first information is used to indicate the near-field codebook.

[0136] In conjunction with some embodiments of the twelfth aspect, in some embodiments, the method includes:

[0137] The terminal sends second information to the network device; wherein the second information is used to indicate a common phase coefficient corresponding to the first codeword.

[0138] In conjunction with some embodiments of the twelfth aspect, in some embodiments, the method includes:

[0139] The network device receives third information sent by the terminal; wherein the third information is used to instruct the terminal to switch between a far-field area and a near-field area.

[0140] It is understandable that the above-mentioned terminals, network devices, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to perform the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0141] The present disclosure provides a communication method, terminal, network device, communication system, and storage medium. In some embodiments, the terms "communication method" and "codebook determination method" and "codeword reporting method" are interchangeable; the terms "communication device" and "codebook determination device" and "codeword reporting device" are interchangeable; and the terms "information processing system" and "communication system" are interchangeable.

[0142] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0143] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0144] 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.

[0145] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0146] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0147] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0148] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0149] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0150] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0151] 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.

[0152] In some embodiments, terms such as "time / frequency" and "time / frequency domain" refer to the time domain and / or the frequency domain.

[0153] 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.

[0154] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", "above" and the like can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", "below" and the like can be replaced with each other.

[0155] 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.

[0156] In some embodiments, "network" can be interpreted as devices included in the network (eg, access network equipment, core network equipment, etc.).

[0157] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station" "fixed station", "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)" and the like may be used interchangeably.

[0158] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0159] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set the structure in which the terminal has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0160] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal.

[0161] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0162] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0163] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0164] FIG1A is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure (a system diagram including only the subjects related to the invention point and their important opposite sides, and the number of subjects corresponds to the number of subjects involved in the invention point).

[0165] As shown in Figure 1A, a communication system 100 includes a terminal 101 and a network device 102. In some embodiments, the network device 102 may include at least one of an access network device and a core network device.

[0166] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0167] In some embodiments, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0168] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0169] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0170] In some embodiments, the core network device may be a single device including a first network element, a second network element, etc., or may be a plurality of devices or a group of devices, each including all or part of the first network element, the second network element, etc. The network element may be virtual or physical. The core network may include, for example, at least one of an evolved packet core (EPC), a 5G core network (5GCN), and a next generation core (NGC).

[0171] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0172] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1A , or a portion thereof, but are not limited thereto. The entities shown in FIG1A are illustrative only. The communication system may include all or part of the entities shown in FIG1A , or may include other entities other than those shown in FIG1A . The number and form of the entities may be arbitrary, and the entities may be physical or virtual. The connection relationships between the entities are illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0173] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0174] In some embodiments, network device 102 may be a network device in an extra large scale massive multiple input multiple output (XL-MIMO) system. Network device 102 may include a first antenna array, which may be used to transmit wireless signals from the network device to a terminal. Optionally, the type of the first antenna array may include, but is not limited to, a uniform linear array or a uniform planar array.

[0175] In some embodiments, the radiation range of an 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, which is proportional to the antenna aperture and carrier frequency of the antenna array. The near-field region can include a radiative near field and / or a reactive near field.

[0176] FIG1B is a schematic diagram of a first antenna array according to an exemplary embodiment. As shown in FIG1B , the first antenna array can be modeled on the x-axis of a two-dimensional Cartesian coordinate system, including 7 antenna ports in the horizontal dimension, and the spacing between the 7 antenna ports is the same, that is, the first antenna array is a uniform linear array with N1 equal to 7 and N2 equal to 1, and the spacing between each antenna port can be d x Taking the antenna port with the horizontal dimension index of 0 in the first antenna array as the origin (0, 0), the coordinates of the antenna port with the horizontal dimension index of n1 can be (n1d x ,0), where n1 is an integer and satisfies n1∈{-(N1-1) / 2,…,0,…(N1-1) / 2}. The horizontal dimension length of the antenna array is D x , which can be expressed as D x =N1d x or D x =(N1-1)d x .

[0177] 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, the terminal can be determined to be in the near field area, otherwise it can be determined to be in the far field area. The distance can also be called the Fraunhofer distance.

[0178] The distance between the antenna port indexed as n1 in the first antenna array and the terminal can be calculated as: According to Taylor's formula, the above formula is approximated by a second-order Taylor expansion. Therefore, the distance between the antenna with index n1 in the antenna array and the UE can be approximately calculated as:

[0179] The single-polarization array response vector of the first antenna array can be calculated as:

[0180] Figure 1C is a schematic diagram of a first antenna array according to an exemplary embodiment. As shown in Figure 1C, the first antenna array can be modeled on the xy plane of a three-dimensional Cartesian coordinate system. There are 21 antenna ports in the antenna array, of which the number of antenna ports in the horizontal dimension is 7 and the number of antenna ports in the vertical dimension is 3. The spacing between the antenna ports in their respective dimensions is the same, that is, the first antenna array is a uniform array with N1 equal to 7 and N2 equal to 3, wherein the spacing between the antenna ports in the horizontal dimension can be d x , the vertical spacing between antenna ports can be d z Taking the antenna port with the horizontal and vertical indexes of 0 in the first antenna array as the origin (0, 0, 0), the coordinates of the antenna with the horizontal and vertical indexes (n1, n2) in the antenna array are (n1d x ,0,n2d z ), where n1 and n2 are integers and satisfy n1∈{-(N1-1) / 2,…,0,…(N1-1) / 2} and n2∈{-(N2-1) / 2,…,0,…(N2-1) / 2}.

[0181] If a terminal is located in the xyz space of the three-dimensional Cartesian coordinate system, the distance between the terminal and the origin is r, the angle between the terminal and the positive direction of the x-axis is θ and 0≤θ≤π, and the angle between the terminal and the positive direction of the z-axis is and According to the geometric relationship, we can get In this example, the equivalent antenna aperture in the horizontal dimension of the antenna array is The equivalent antenna aperture in the vertical dimension is When the terminal is located in the xyz three-dimensional space, the horizontal dimension Rayleigh distance can be calculated as The Rayleigh distance in the vertical dimension can be calculated as In this way, when the distance between the terminal and the first antenna array in the horizontal dimension and / or the vertical dimension is less than or equal to the Rayleigh distance, it can be determined that the terminal is located in the near field area.

[0182] The distance between the antenna port indexed by (n1, n2) in the first antenna array and the terminal can be calculated as: According to Taylor's formula, the above formula is approximated by a second-order Taylor expansion. Therefore, the distance between the antenna indexed (n1, n2) in the antenna array and the terminal can be approximately calculated as:

[0183] The single-polarization array response vector of the first antenna array can be calculated as:

[0184] In some embodiments, only the far-field region is considered, and the channel model and codebook design are both tailored to far-field MIMO. However, with the substantial increase in antenna array size and frequency band, the Rayleigh distance increases to a certain extent, making it easier for terminals in the communication system to enter the near-field region of the antenna array. In the near-field region, electromagnetic waves propagate as spherical waves, while in the far-field region, electromagnetic waves propagate as plane waves. Therefore, codebook designs designed for the far-field region cannot guarantee the quality of communication in the near-field region.

[0185] It is worth noting that the first antenna arrays shown in Figures 1B and 1C are exemplary only. The number of antenna ports in the first antenna array may be smaller or larger than that shown in Figures 1B or 1C, and this is not limited in the present disclosure. For example, the first antenna array may have 64 ports in both the horizontal and vertical dimensions.

[0186] FIG2 is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG2 , the present disclosure embodiment relates to a communication method, and the method includes:

[0187] Step S2101: The terminal determines that it is in a near field area.

[0188] It is understood that the near-field region may refer to a region where the terminal is relatively close to the antenna array. For example, when the distance between the terminal and the first antenna array in the horizontal dimension and / or the vertical dimension is less than or equal to the Rayleigh distance, the terminal may be determined to be in the near-field region of the first antenna array.

[0189] In some embodiments, the first antenna array is an antenna array used by a network device to transmit wireless signals to a terminal. For example, the network device may precode data in a data stream based on a codeword so that the wireless signal transmitted by the network device can be accurately and reliably received by a terminal in a near-field area.

[0190] In some embodiments, the first antenna array may be any one of the following: a uniform linear array; a uniform planar array. Optionally, the first antenna array may also be a triangular array or a circular array, which is not limited in the present embodiment.

[0191] In some embodiments, the first antenna array of the network device has N1 as the number of antenna ports in the horizontal dimension and N2 as the number of antenna ports in the vertical dimension, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1. Optionally, N1 is greater than or equal to N2.

[0192] 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.

[0193] It can be understood that when N1 or N2 is equal to 1 and the spacing between the antenna ports is the same, the first antenna array can be a uniform linear array. When N1 and / or N2 is greater than 1 and the spacing between the antenna ports is the same, the first antenna array can be a uniform planar array. The spacing between the antenna ports in the horizontal dimension can be expressed as d x , the spacing in the vertical dimension can be expressed as d z , the horizontal dimension length of the antenna array can be expressed as D x , where D x =N1d x or D x =(N1-1)d x , or other representations, which are not limited in the present disclosure. The vertical dimension length of the antenna array can be expressed as D z , where D z =N2d z or D z =(N2-1)d z , or other representations are possible, which are not limited in the embodiments of the present disclosure.

[0194] In some embodiments, the terminal can determine whether the terminal itself is in the near-field area through a reference signal sent by a network device. For example, the terminal can receive a channel state information reference signal (CSI-RS) sent by a network device, and the terminal can perform channel estimation through the CSI-RS to determine whether it is in the near-field area. For example, the terminal can determine the distance from the first antenna array based on the CSI-RS to determine whether it is in the near-field area. The reference signal can also be TRS, SSB, etc., which are not limited here.

[0195] In some embodiments, a terminal can determine whether it is in the near-field region based on a power parameter. The power parameter indicates the terminal's uplink transmit power or path loss (PL). For example, the terminal can determine whether it is in the near-field region based on the transmit power of PARCH and / or MSG1. For example, using the RACH procedure as an example, the UE determines the L1-RSRP to be -100dBm, and based on RRC Reconfiguration, determines the SSB power to be -12dBm, calculating PL = 88dB. The path loss threshold is PL(i), where i is affected by other parameters such as the level of interference and the frequency band of the current communication. When PL>PL(i), the terminal determines that it is in the near-field region; otherwise, it determines that it is in the far-field region. For another example, using the RACH procedure as an example, during the repetition of MSG1 and MSG3, the UE's transmit power increases accordingly. When the UE's transmit power exceeds the transmit power threshold, the terminal determines that it is in the near-field region; otherwise, it determines that it is in the far-field region. The terminal threshold is similar to PL(i) and may not be a fixed value.

[0196] In some embodiments, a terminal can determine whether it is in a near-field area using a distance parameter. The distance parameter indicates the distance between the terminal and the network device or the first antenna array in a geographical environment; or indicates whether the distance between the terminal and the network device or the first antenna array is less than or greater than the Rayleigh distance. The definition of the distance parameter is described below and is not repeated here.

[0197] In some embodiments, the terminal being in the near-field area of ​​the first antenna array may mean that the terminal is in the near-field area of ​​the first antenna array in at least one of a horizontal dimension and a vertical dimension.

[0198] In some embodiments, the terminal determines that it is in the near field area of ​​the first antenna array, including at least one of the following: the terminal determines that it is in the near field area only in the horizontal dimension; the terminal determines that it is in the near field area only in the vertical dimension; the terminal determines that it is in the near field area in both the horizontal dimension and the vertical dimension.

[0199] For example, 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; 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; when the first antenna array is a uniform 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.

[0200] In some embodiments, if the terminal determines that it is in the near-field area of ​​the first antenna array, it may determine that the codebook currently in use is a near-field codebook. Optionally, the near-field codebook may include multiple codebooks, and at least one of the basis vectors in the horizontal dimension and the basis vectors in the vertical dimension of the multiple codebooks is different. Optionally, based on its positional relationship with the first antenna array, the terminal may determine the codebook that best matches the current state of the terminal from the far-field codebook and the multiple near-field codebooks, and determine the optimal or most matching codeword from these.

[0201] Step S2102: The terminal determines a candidate second basis vector.

[0202] In some embodiments, the candidate second basis vectors are basis vectors used when the terminal is in a near-field region and / or a far-field region. Optionally, the candidate second basis vectors are used for signal transmission in the near-field region and / or the far-field region. Optionally, the candidate second basis vectors can be used by the terminal to determine at least one of a near-field codebook and a far-field codebook.

[0203] In some embodiments, the candidate second basis vectors are determined based on an angle parameter. Optionally, the number of candidate second basis vectors may be one or more. Different angle parameters may correspond to different candidate second basis vectors.

[0204] In some embodiments, the candidate second basis vectors may be pre-stored or pre-configured in the terminal and the network device. In some embodiments, the candidate second basis vectors are the same as the discrete Fourier transform (DFT) basis vectors in the downlink Type 1 (DL Type I) codebook. The near-field codebook may be determined based on the DFT basis vectors in the DL Type I codebook and the candidate first basis vectors.

[0205] In some embodiments, the second basis vector may be any one of a plurality of candidate second basis vectors. The plurality of candidate second basis vectors may be basis vectors in a near-field codebook or basis vectors in a far-field codebook. For example, for a far-field codebook and / or a near-field codebook, the terminal may pre-store a plurality of candidate second basis vectors, each candidate first basis vector corresponding to a different angle parameter. When the terminal determines that it is in a far-field area, the second basis vector may be determined from the plurality of candidate second basis vectors corresponding to the far-field codebook. Alternatively, when the terminal determines that it is in a near-field area, the second basis vector may also be determined from the plurality of candidate second basis vectors mentioned above.

[0206] In some embodiments, the terminal determines candidate second basis vectors based on measurement results of a reference signal. Optionally, the terminal determines, based on the measurement results, that the terminal is in the near-field region of the first antenna array and determines the optimal second basis vector among the candidate second basis vectors. For example, determining the second basis vector by the terminal may include: determining a candidate second basis vector corresponding to a best-matching angle parameter, where the candidate second basis vector corresponding to the best-matching angle parameter may be the second basis vector determined by the terminal.

[0207] Among them, the best matching candidate second basis vector, that is, the second basis vector or the best matching angle parameter can be determined based on a preset algorithm, which is not limited in the embodiment of the present disclosure. Among them, the angle parameter can be a set of possible values ​​of the angle domain of the terminal for the first antenna array. For example, with reference to Figure 1B or Figure 1C, the angle parameter can include any angle value in the angle domain of the horizontal dimension and any angle value in the angle domain of the vertical dimension. The angle domain of the horizontal dimension can include, for example, cosθ or Any possible value, the angular domain of the vertical dimension may include, for example Any possible value.

[0208] In some embodiments, the angle parameter includes at least one first angle parameter of a horizontal dimension and at least one second angle parameter of a vertical dimension, wherein the first angle parameter may be obtained by quantizing the angle domain of the horizontal dimension, and the second angle parameter may be obtained by quantizing the angle domain of the vertical dimension.

[0209] Optionally, the first angle parameter may be obtained by quantizing the angle domain of the horizontal dimension based on the number of antenna ports N1 in the horizontal dimension and the oversampling factor O1, and the number of first angle parameters may be N1O1. Optionally, the second angle parameter may be obtained by quantizing the angle domain of the vertical dimension based on the number of antenna ports N2 in the vertical dimension and the oversampling factor O2, and the number of first angle parameters may be N2O2.

[0210] Optionally, the first angle parameter and the second angle parameter may also be obtained by quantization based on a preconfigured number of samples, and the value of the number of samples is not limited in the embodiment of the present disclosure.

[0211] In some embodiments, the terminal may determine the second basis vector regardless of whether it is in the far field area or the near field area, for example, according to a preset period or a preset trigger event.

[0212] In some embodiments, the candidate second basis vectors include basis vectors in a horizontal dimension and basis vectors in a vertical dimension, and the candidate second basis vectors are Kronecker products of the basis vectors in the horizontal dimension and the basis vectors in the vertical dimension in the candidate second basis vectors.

[0213] For example, if the basis vector of the horizontal dimension in the candidate second basis vector is v′ and the basis vector of the vertical dimension is u′, then the candidate second basis vector can be expressed as

[0214] When the first antenna array is a uniform linear array, the basis vectors of the vertical dimension in the candidate second basis vectors may all be 1, that is, the candidate second basis vectors are the basis vectors of the horizontal dimension.

[0215] For example, the first antenna array is a uniform linear array, and the terminal determining the second basis vector may include: the terminal determining a basis vector of a horizontal dimension corresponding to the most matching first angle parameter as the second basis vector.

[0216] In some embodiments, the n′1th element in the basis vector v′ of the horizontal dimension of the candidate second basis vector for: The n′2th element in the basis vector u′ of the vertical dimension of the candidate second basis vector for:

[0217] Wherein, n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension, n′1=n1+(N1+1) / 2, n′2=n2+(N2+1) / 2; l represents the first angle parameter corresponding to the candidate second basis vector, m represents the second angle parameter corresponding to the candidate second basis vector, O1 represents the oversampling factor of the angle parameter in the horizontal dimension, O2 represents the oversampling factor of the angle parameter in the vertical dimension, l=0,1,…,N1O1-1, m=0,1,…,N2O2-1; j is an imaginary unit, λ represents the wavelength of the wireless signal, d x Denotes the horizontal antenna spacing of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D x Denotes the horizontal dimension length of the first antenna array, D z Represents the vertical dimension length of the first antenna array.

[0218] It is worth noting that when the first antenna array is a uniform linear array, the vertical basis vector of each candidate second basis vector can be 1. In this way, the second angle parameter and the vertical basis vectors can be ignored. Furthermore, when the first antenna array is a uniform linear array, only whether the terminal is in the near field in the horizontal dimension can be considered.

[0219] It is understandable that each candidate second basis vector may include a horizontal component and a vertical component. Based on the above formula, a candidate second basis vector corresponding to each first angle parameter and each second angle parameter can be determined, and then a near-field codebook and / or a far-field codebook can be constructed based on the candidate second basis vectors corresponding to each first angle parameter and each second angle parameter.

[0220] In some embodiments, the candidate second basis vectors may be referred to as far-field basis vectors, or may be other names, which are not limited in the embodiments of the present disclosure.

[0221] In some embodiments, the candidate second basis vectors are used for single-polarization single-layer transmission; or, the candidate second basis vectors are used for dual-polarization multi-layer transmission, and the candidate second basis vectors can be constructed based on the angle parameter and the common phase coefficient, and the common phase coefficient can correspond to the number of layers of the dual-polarization multi-layer transmission.

[0222] Optionally, the candidate second basis vectors may be a codebook obtained by performing multi-layer and dual-polarization on the DFT basis vectors in the DL Type I codebook according to the common phase coefficients, or the candidate second basis vectors for single-polarization single-layer transmission.

[0223] Step S2103: The terminal determines a candidate first basis vector.

[0224] In some embodiments, the candidate first basis vectors are basis vectors used for the near-field region. Optionally, the candidate first basis vectors are used to modify the candidate second basis vectors to obtain a near-field codebook. Optionally, the near-field codebook is determined based on the candidate first basis vectors and the candidate second basis vectors. Alternatively, the candidate first basis vectors are used to determine the near-field codebook.

[0225] In some embodiments, the candidate first basis vectors are determined based on a distance parameter. Optionally, the number of candidate first basis vectors may be one or more. Different distance parameters may correspond to different candidate first basis vectors.

[0226] It can be understood that, considering that the electromagnetic waves in the near-field region are spherical waves rather than plane waves in the remote region, the candidate first basis vectors can be determined based on the distance parameter, and the influence of the distance on the codeword can be introduced, so that the near-field codebook generated by introducing the candidate first basis vectors can be more in line with the characteristics of near-field transmission.

[0227] In some embodiments, the candidate first basis vectors may be pre-stored or pre-configured in the terminal and the network device.

[0228] In some embodiments, the first basis vector may be any one of a plurality of candidate first basis vectors. For example, for a near-field codebook, the terminal may pre-store a plurality of candidate first basis vectors, each corresponding to a different distance parameter. When the terminal is in the near-field area, the terminal may determine the first basis vector from the plurality of candidate first basis vectors corresponding to the near-field codebook.

[0229] The terminal can determine candidate first basis vectors in a variety of ways, not limited herein. The following describes several exemplary methods for determining first basis vectors. In some embodiments, the terminal can determine the first basis vectors based on relative position. The relative position indicates the relative position of the terminal and the first antenna array; further, the relative position includes the azimuth and / or elevation angles of the terminal and the first antenna array.

[0230] It can be understood that, considering that the directivity pattern in the near field area varies with distance, considering the relative position in the process of determining the first basis vectors can improve the effectiveness of the codebook generated based on the candidate first basis vectors.

[0231] In some embodiments, the terminal may determine the most suitable candidate first basis vector based on the measurement result of the reference signal. Optionally, the terminal may determine, based on the measurement result, that the terminal is in the near-field region of the first antenna array and determine the candidate first basis vector corresponding to the most matching distance parameter as the first basis vector. Optionally, the terminal may traverse each candidate first basis vector in the near-field codebook and determine the most suitable candidate first basis vector, such as the candidate first basis vector with the best communication quality, as the first basis vector.

[0232] Optionally, the terminal determining the first basis vector may include: the terminal determining a candidate first basis vector corresponding to a most matching distance parameter.

[0233] The distance parameter may be a set of possible values ​​of the distance domain of the terminal for the first antenna array. For example, referring to FIG1B or FIG1C, the distance parameter may include any distance value in the distance domain of the horizontal dimension in the near field area and any distance value in the distance domain of the vertical dimension, and the distance domain of the horizontal dimension may be, for example, less than or equal to or Any possible value, the distance domain of the vertical dimension can be less than or equal to Any possible value.

[0234] In some embodiments, the distance parameter includes a first distance parameter in at least one horizontal dimension and a second distance parameter in at least one vertical dimension, wherein the first distance parameter may be obtained by quantizing the distance domain of the horizontal dimension, and the second distance parameter may be obtained by quantizing the distance domain of the vertical dimension.

[0235] Optionally, the first distance parameter may be obtained by quantizing the distance domain of the horizontal dimension based on the number N3 of sampling points of the distance parameter in the horizontal dimension and the oversampling factor O3, and the number of the first distance parameters may be N3O3. Optionally, the second distance parameter may be obtained by quantizing the distance domain of the vertical dimension based on the number N4 of sampling points of the vertical dimension and the oversampling factor O4, and the number of the first distance parameters may be N4O4.

[0236] Optionally, the first distance parameter and the second distance parameter may also be obtained by quantization based on a preconfigured number of samples, and the value of the number of samples is not limited in the embodiment of the present disclosure.

[0237] In some embodiments, the terminal may determine the second basis vector only when it is determined to be in the near field area. For example, when in the near field area, the terminal may determine the first basis vector according to a preset period or a preset trigger event.

[0238] In some embodiments, the first basis vector includes a basis vector of a horizontal dimension and a basis vector of a vertical dimension, and the first basis vector is a Kronecker product of the basis vector of the horizontal dimension and the basis vector of the vertical dimension in the first basis vector.

[0239] For example, if the horizontal dimension of the first basis vector is v″ and the vertical dimension of the basis vector is u″, then the first basis vector can be expressed as

[0240] When the first antenna array is a uniform linear array, the basis vector of the vertical dimension in the first basis vector may be 1, that is, the basis vector of the horizontal dimension of the first basis vector.

[0241] For example, the first antenna array is a uniform linear array, and the terminal determining the first basis vector may include: the terminal using the candidate first basis vector of the horizontal dimension corresponding to the most matching first distance parameter as the first basis vector.

[0242] In some embodiments, the terminal may determine only one of the basis vectors in the horizontal dimension or the basis vectors in the vertical dimension in the first basis vectors only when the terminal is in the near field area in either the horizontal dimension or the vertical dimension.

[0243] For example, if the terminal is in the near field area only in the vertical dimension, the terminal may use the basis vector of the vertical dimension corresponding to the most matching second distance parameter as the first basis vector.

[0244] In some embodiments, the n′1th element in the horizontal dimension of the basis vector v″ in the candidate first basis vector for:

[0245] The n′2th element in the basis vector u″ of the vertical dimension in the candidate first basis vector for:

[0246] Among them, n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension, n′1=n1+(N1+1) / 2, n′2=n2+(N2+1) / 2; o1 represents the first distance parameter corresponding to the candidate first basis vector, o2 represents the second distance parameter corresponding to the candidate first basis vector, O3 represents the oversampling factor of the distance parameter in the horizontal dimension, O4 represents the oversampling factor of the distance parameter in the vertical dimension, o1=1,2,…,N3O3, o2=1,2,…,N4O4; j is an imaginary unit, λ represents the wavelength of the wireless signal, d x Denotes the horizontal antenna spacing of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D x Denotes the horizontal dimension length of the first antenna array, D z Represents the vertical dimension length of the first antenna array.

[0247] In some embodiments, and The n′1th element in the basis vector of the horizontal dimension in the candidate first basis vector for: The n′2th element in the basis vector of the vertical dimension of the candidate first basis vector for:

[0248] It is worth noting that when the first antenna array is a uniform linear array, the basis vector corresponding to the vertical dimension in the candidate first basis vectors can be 1. In this way, the second distance parameter and the basis vectors in the vertical dimension can be ignored. Furthermore, when the first antenna array is a uniform linear array, only whether the terminal is in the near field in the horizontal dimension can be considered.

[0249] It can be understood that the candidate first basis vectors may include components of the horizontal dimension and components of the vertical dimension. Based on the above formula, the candidate first basis vectors corresponding to each first distance parameter and each second distance parameter can be determined, and then the near-field codebook is constructed based on the candidate first basis vectors corresponding to each first distance parameter and each second distance parameter.

[0250] In some embodiments, the candidate first basis vectors may be referred to as near-field correction basis vectors, or may be other names, which are not limited in the embodiments of the present disclosure.

[0251] In some embodiments, the candidate first basis vectors are used for single-polarization single-layer transmission; or, the candidate first basis vectors are used for dual-polarization multi-layer transmission, and the candidate first basis vectors can be constructed based on the distance parameter and the common phase coefficient, and the common phase coefficient can correspond to the number of layers of the dual-polarization multi-layer transmission.

[0252] Optionally, the candidate first basis vectors may be a codebook obtained by performing multi-layer and dual-polarization on the candidate first basis vectors for single-polarization single-layer transmission in the above optional embodiment according to the common phase coefficient.

[0253] Step S2104: The terminal determines the first codeword in the near-field codebook.

[0254] In some embodiments, the near-field codebook is determined based on the candidate first basis vectors. Alternatively, the near-field codebook is obtained by multiplying the candidate first basis vectors by the candidate second basis vectors. Alternatively, the near-field codebook is obtained by modifying the candidate second basis vectors using the candidate first basis vectors.

[0255] For example, the n′1th element in the horizontal dimension basis vector v in the near-field codebook It can be expressed as in, represents the n1′th element in the basis vector of the horizontal dimension in the candidate second basis vector, The n′1th element in the horizontal dimension of the candidate first basis vector. The n′2th element in the vertical dimension of the basis vector u in the near-field codebook. It can be expressed as in, represents the n′2th element in the basis vector of the horizontal dimension in the candidate second basis vector, Represents the n′2th element in the basis vector of the horizontal dimension in the candidate first basis vector.

[0256] In some embodiments, the near-field codebook may be pre-stored or pre-configured in the network device and the terminal.

[0257] In some embodiments, the terminal determines a first codeword in a near-field codebook based on the measurement results. Alternatively, the terminal determines, based on the measurement results, that the terminal is in a near-field region of the first antenna array and determines the first codeword in the near-field codebook. Alternatively, the terminal may traverse each codeword in the near-field codebook and determine the optimal or most matching codeword as the first codeword.

[0258] In some embodiments, the first codeword is determined based on a first basis vector and a second basis vector determined by the terminal.

[0259] After determining the second basis vector and the first basis vector, the terminal may perform vector multiplication on the first basis vector and the candidate second basis vector to obtain a first codeword, wherein the calculated first codeword is the codeword in the near-field codebook.

[0260] In some embodiments, the n′1th element in the horizontal dimension basis vector v in the near-field codebook for:

[0261] The n′2th element in the basis vector u of the vertical dimension in the near-field codebook for:

[0262] in, and That is, it can be a candidate second basis vector, and That is, it can be a candidate first basis vector, and the candidate first basis vector can be a term introduced when considering the near-field spherical wave.

[0263] In some embodiments, and The n′1th element in the horizontal dimension of the basis vector v in the near-field codebook for: The n′2th element in the basis vector u of the vertical dimension in the near-field codebook for:

[0264] It is worth noting that when the first antenna array is a uniform linear array, the basis vector corresponding to the vertical dimension in the near-field codebook can be 1. In this way, the basis vectors in the vertical dimension can be ignored. Furthermore, when the first antenna array is a uniform linear array, only whether the terminal is in the near-field area in the horizontal dimension can be considered.

[0265] It can be understood that the codewords in the near-field codebook may include components in the horizontal dimension and components in the vertical dimension. Based on the above formula, the codewords corresponding to each first angle parameter, each second angle parameter, each first distance parameter, and each second distance parameter can be determined, thereby constructing the near-field codebook.

[0266] It can be understood that the near-field codebook in the above embodiment may be a codebook used when the terminal is in the near-field area in both the horizontal dimension and the vertical dimension, for example, may be called a third near-field codebook.

[0267] In some embodiments, the near-field codebook includes at least one of the following: a first near-field codebook, which is a codebook used by the terminal only when the horizontal dimension is in the near-field area; a second near-field codebook, which is a codebook used by the terminal only when the vertical dimension is in the near-field area; and a third near-field codebook, which is a codebook used when the terminal is in the near-field area in both the horizontal and vertical dimensions.

[0268] The first near-field codebook may be determined based on the basis vectors of the horizontal dimension among the candidate second basis vectors and the candidate first basis vectors. The second near-field codebook may be determined based on the basis vectors of the vertical dimension among the candidate second basis vectors and the candidate first basis vectors. The third near-field codebook may be determined based on the basis vectors of the horizontal dimension and the basis vectors of the vertical dimension among the candidate second basis vectors and the candidate first basis vectors.

[0269] That is, the candidate first basis vectors may be introduced only in one or both of the horizontal and vertical dimensions to obtain a corresponding near-field codebook. For example, if the terminal is in the near-field region only in the horizontal dimension, the terminal may use the basis vectors in the horizontal dimension of the candidate first basis vectors to modify the basis vectors in the horizontal dimension of the candidate second basis vectors, thereby obtaining a first near-field codebook and determining the first codeword based on the codebook.

[0270] In some embodiments, the terminal may determine the codebook that best matches its state from among the far-field codebook, the first near-field codebook, the second near-field codebook, and the third near-field codebook. For example, if the terminal is only in the near-field region in the horizontal dimension, the first near-field codebook may be determined to be the currently used codebook.

[0271] For example, when the terminal is in the near-field area only in the horizontal dimension, the basis vectors of the near-field codebook (ie, the first near-field codebook) used by the terminal in the horizontal dimension can be expressed as: The basis vectors of the near-field codebook used by the terminal in the vertical dimension can be expressed as: That is, only when the terminal is in the near field area in the horizontal dimension, it can traverse various values ​​of l and m based on the above formula to determine the optimal codeword, which can be the first codeword determined by the terminal this time.

[0272] In some embodiments, the near-field codebook is used for single-polarization single-layer transmission; or the near-field codebook is used for dual-polarization multi-layer transmission. Optionally, the near-field codebook can be constructed based on candidate first basis vectors, candidate second basis vectors, and co-phase coefficients, or angle parameters, distance parameters, and co-phase coefficients.

[0273] Among them, in the case of dual-polarization multi-layer transmission, in the case of QPSK, the common phase coefficient can be any one of the four values ​​[1, -1, j, -j], in the case of BPSK, the common phase coefficient can be any one of the values ​​[1, -1], and in the case of 8PSK, the common phase coefficient can be Optionally, the near-field codebook may include a codeword constructed based on each angle parameter, each distance parameter, and each common phase coefficient.

[0274] Optionally, the near-field codebook may be a codebook obtained by performing multi-layer and dual-polarization on the near-field codebook used for single-polarization single-layer transmission in the above optional embodiment according to the common phase coefficient.

[0275] Step S2105: The terminal determines that a switch between the far-field area and the near-field area occurs, and sends third information to the network device.

[0276] Step S2105 is optional. In some embodiments, the terminal may send third information to the network device to indicate whether a switch between a far-field region and a near-field region has occurred. In other embodiments, the network device may determine whether a switch between a far-field region and a near-field region has occurred at the terminal, and whether the relative angle between the terminal and the network device has changed, etc., by other means, which are not limited in the present embodiment.

[0277] It is understood that the far-field region may refer to a region where the terminal is farther from the antenna array. For example, when the distance between the terminal and the first antenna array in the horizontal dimension and / or the vertical dimension is greater than or equal to the Rayleigh distance, the terminal may be determined to be in the far-field region of the first antenna array.

[0278] In some embodiments, the terminal may continuously receive the CSI-RS transmitted by the network device. The terminal may perform channel estimation based on the CSI-RS to determine whether to switch from the near-field region to the far-field region, or vice versa. For example, the terminal may determine the distance from the first antenna array based on the CSI-RS to determine whether it is in the far-field region.

[0279] In some embodiments, the terminal switching to the far-field area of ​​the first antenna array may mean that the terminal switches from the near-field area of ​​the first antenna array to the far-field area in at least one of the horizontal dimension and the vertical dimension, and the terminal switching to the near-field area of ​​the first antenna array may mean that the terminal switches from the far-field area of ​​the first antenna array to the near-field area in at least one of the horizontal dimension and the vertical dimension.

[0280] In some embodiments, the terminal determines that a switch occurs between the far field area and the near field area, including at least one of the following: the terminal determines that the switch occurs from the near field area to the far field area in the horizontal dimension; the terminal determines that the switch occurs from the near field area to the far field area in the vertical dimension; the terminal switches from the near field area to the far field area in both the horizontal dimension and the vertical dimension; the terminal determines that the switch occurs from the far field area to the near field area in the horizontal dimension; the terminal determines that the switch occurs from the far field area to the near field area in the vertical dimension; the terminal switches from the far field area to the near field area in both the horizontal dimension and the vertical dimension.

[0281] In some embodiments, the third information is used to indicate whether the second basis vector has changed. Optionally, the third information is used to indicate whether the best-matching angle parameter has changed. Alternatively, the third information is used to indicate that the terminal has switched between a far-field region and a near-field region; alternatively, the third information is used to indicate that the terminal is currently in a far-field region or a near-field region; alternatively, the third information is used to indicate the currently used codebook, for example, the codebook currently used by the terminal may be any one of the first near-field codebook, the second near-field codebook, the third near-field codebook, and the far-field codebook.

[0282] Among them, the change of the second basis vector may refer to a change in the parameters related to the candidate second basis vector that is currently most matched by the terminal, for example, a change in the first angle parameter and / or second angle parameter corresponding to the second basis vector determined by the terminal this time.

[0283] In some embodiments, regardless of whether the terminal is in the near field area, the terminal can continue to execute step S2102, for example, execute step S2102 multiple times according to a preset cycle or based on a trigger event to determine the second basis vector corresponding to the terminal at different times.

[0284] It can be understood that the terminal can determine the corresponding second basis vector, that is, the far-field codeword, before and after the switching occurs. The terminal can compare the second basis vector determined this time with the second basis vector determined last time to determine that the third information is used to indicate that the second basis vector has changed, or the second basis vector has not changed.

[0285] In some embodiments, if the terminal determines that the second basis vector has not changed, it can send third information to the network device to indicate that the second basis vector has not changed. If it determines that the second basis vector has changed, it can send third information to the network device to indicate that the second basis vector has changed.

[0286] In some embodiments, if the terminal determines that it is in the near field area and the second basis vector has not sent any changes, it can be determined that the first information sent to the network device in step S2106 may not include information related to the first angle parameter and the second angle parameter. For example, the first information may not include the first indication field and the second indication field.

[0287] In some embodiments, the network device receives the third information. Optionally, the network device determines whether the third codeword has changed based on the third information.

[0288] In some embodiments, the network device determines that the second basis vector has changed and expects to receive candidate second basis vector related parameters in the first information. In some embodiments, the network device determines that the third codeword has not changed and does not expect to receive candidate second basis vector related parameters in the first information.

[0289] The candidate second basis vector related parameters may include a first indicator field and a second indicator field, or a first angle parameter and a second angle parameter.

[0290] For example, the terminal continuously receives CSI-RS and performs channel estimation and when determining to switch from the far-field area to the near-field area, the terminal can traverse the candidate second basis vectors corresponding to each angle parameter to determine the current second basis vector, and compare it with the second basis vector obtained the previous time. When the terminal determines that the second basis vectors determined twice are the same, it can send third information to the network device to indicate that the second basis vector has not changed, for example, third information with a value of 0 in the indication field. After receiving the third information, the network device can determine that the current second basis vector of the terminal is the candidate second basis vector reported by the terminal last time. Then, the network device can determine the near-field codeword currently corresponding to the terminal based on the candidate second basis vector and information related to the first basis vector indicated in step S2106, and precode the data in the data stream.

[0291] Alternatively, when the terminal determines that it has switched from the near-field area to the far-field area, the terminal can traverse the candidate second basis vectors corresponding to each angle parameter to determine the current second basis vector, and compare it with the second basis vector obtained the previous time. When the terminal determines that the second basis vectors determined twice are different, the terminal can send a third information with a value of 1 in the indication field to the network device. After the network device receives the third information, it can further receive the information reported by the terminal and determine the current second basis vector of the terminal based on the information reported by the terminal, and then pre-encode the data in the data stream based on the candidate second basis vector.

[0292] Step S2106: The terminal sends first information to the network device.

[0293] Step S2106 is optional. If the terminal needs to indicate a codeword, the terminal may send a first message to the network device to indicate the codeword. In some embodiments, the network device may indicate the codeword selected by the terminal via a reference signal such as a DM-RS. Whether the terminal needs to indicate a codeword may depend on the transmission mode and is not limited here.

[0294] In some embodiments, the first information is used to indicate a codeword determined by the terminal. Optionally, when the terminal is in a near-field area, the first information is used to indicate the first codeword. Optionally, the first information is used to indicate an angle parameter and / or distance parameter corresponding to the first codeword. Optionally, the first information is used to indicate a first basis vector and a candidate second basis vector determined by the terminal.

[0295] Among them, the distance parameter corresponding to the first codeword can be the distance parameter corresponding to the first basis vector determined by the terminal; the angle parameter corresponding to the first codeword can be the angle parameter corresponding to the second basis vector determined by the terminal.

[0296] 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.

[0297] It can be understood that the first codeword can be determined based on the first basis vector and the second basis vector, the first angle parameter corresponding to the first codeword is also the first angle parameter corresponding to the second basis vector, the second angle parameter corresponding to the first codeword is also the second angle parameter corresponding to the second basis vector, the first distance parameter corresponding to the first codeword is also the first distance parameter corresponding to the first basis vector, and the second distance parameter corresponding to the first codeword is also the second distance parameter corresponding to the first basis vector.

[0298] 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.

[0299] For example, if the number of angle parameters in the horizontal and vertical dimensions of the near-field codebook is N1O1=N2O2=4 and the number of distance parameters in the horizontal and vertical dimensions is N3O3=N4O4=4, the first indication field, the second indication field, the third indication field, and the fourth indication field can include 2 bits in decibels. 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.

[0300] It is understandable that when the first antenna array is a uniform linear array, the terminal does not need to feedback relevant parameters of the vertical dimension. For example, the first information may only include relevant parameters of the horizontal dimension, for example, the first information only includes the first indication field and the third indication field. When the terminal is in the near-field region in only one of the horizontal or vertical dimensions, the terminal may only feedback relevant parameters of the dimension in the near-field region in the first basis vector of the terminal. For example, if the first antenna array is a uniform planar array and the terminal is in the near-field region only in the horizontal dimension, the terminal may determine that the first information includes the first indication field, the second indication field, and the third indication field.

[0301] In some embodiments, the network device receives first information. Optionally, the network device determines a first codeword based on the first information. Optionally, the network device determines a first basis vector determined by the terminal and a candidate second basis vector based on the first information, and determines the first codeword based on the first basis vector and the second basis vector.

[0302] In some embodiments, the network device determines the second basis vector determined by the terminal based on the first angle parameter and the second angle parameter indicated by the first information, and determines the first basis vector determined by the terminal based on the first distance parameter and the second distance parameter indicated by the first information, and further determines the first codeword based on the first basis vector and the second basis vector.

[0303] For example, if the first antenna array is a uniform linear array, and the terminal determines that the second basis vector has not changed when switching from the far-field area to the near-field area, the terminal can send first information including only the first indication field to the network device. After the network device receives the first information, it can determine the first codeword based on the first distance parameter and the first angle parameter last fed back by the terminal, wherein the first distance parameter can be indicated by the first indication field.

[0304] 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.

[0305] Step S2107: The terminal sends second information to the network device.

[0306] Step S2107 is optional. If the terminal is required to indicate the co-phase coefficient, the terminal may send second information to the network device to indicate the co-phase coefficient. In some embodiments, the network device may indicate the co-phase coefficient selected by the terminal via a reference signal such as a DM-RS. Whether the terminal is required to indicate the co-phase coefficient may be related to the transmission mode and is not limited here. Alternatively, the network device may determine the co-phase coefficient based on an angle parameter.

[0307] In some embodiments, the second information is used to indicate a common phase coefficient corresponding to the first codeword. Optionally, the common phase coefficient is a common phase coefficient corresponding to a near-field codebook. Optionally, the near-field codebook is used for dual-polarization multi-layer transmission.

[0308] 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 a common phase coefficient corresponding to the first codeword.

[0309] In some embodiments, the second information may include N bits. For example, when N is 1, the second information is used to indicate BPSK; when N is 2, the second information is used to indicate QPSK; and when N is 3, the second information is used to indicate 8-PSK.

[0310] It can be understood that if it is QPSK, the common phase coefficient 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 can be any one of the values ​​[1, -1], which can be indicated by 1 bit; if it is 8PSK, the common phase coefficient can be Any one of the eight values ​​can be indicated using 3 bits.

[0311] For example, when the second information includes 1 bit, when the value of the bit is 1, the common phase coefficient corresponding to the first codeword may be 1; when the value of the bit is 0, the common phase coefficient corresponding to the first codeword may be -1.

[0312] In some embodiments, the network device receives the second information. Optionally, the network device determines, based on the second information, a codebook corresponding to the first codeword for use in dual-polarization multi-layer operations. Optionally, the network device determines the first codeword based on the first information and the second information.

[0313] 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 and corresponding codeword with the best communication quality for the terminal based on the angle parameter, distance parameter and common phase coefficient. The codeword is the first codeword determined by the terminal.

[0314] 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.

[0315] In the embodiments of the present disclosure, the third information, the first information, and the second information may be carried by the same signaling or information element, for example, different fields within the same information, such as UCI. Alternatively, the first information and the second information may be different information, for example, carried by different signaling or information elements. This embodiment of the present disclosure is not limited in this regard.

[0316] In combination with some of the above embodiments, in one example, the first antenna array is a uniform array. When determining that both the horizontal dimension and the vertical dimension are switched to the near field area, the terminal can perform channel estimation based on the CSI-RS, and then determine the first basis vector and the second basis vector. Specifically, the terminal can determine the most matching first angle parameter, second angle parameter, first distance parameter and second distance parameter, and can determine whether the second basis vector determined this time is the same as the most matching candidate second basis vector determined before switching to the near field area, and send corresponding third information. If the second basis vector determined this time is the same as the candidate second basis vector determined before switching to the near field area, the terminal can determine that the first information only includes the third indication field and the fourth indication field, wherein the third indication field is used to indicate the most matching first distance parameter determined by the terminal, and the fourth indication field is used to indicate the most matching second distance parameter determined by the terminal.

[0317] After receiving the third information, the network device can determine that the second basis vector of the terminal has not changed, and determine the most matching first distance parameter and the most matching second distance parameter determined by the terminal based on the first information, and then determine the first basis vector of the terminal. Further, the network device can determine the first codeword determined by the terminal based on the candidate second basis vector last reported by the terminal and the first basis vector determined based on the first information, and transmit the wireless signal based on the first codeword.

[0318] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0319] In some embodiments, the terms "codebook," "codeword," and "precoding matrix" may be used interchangeably. For example, a codebook may be a collection of one or more codewords / precoding matrices.

[0320] 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", and "direct link communication" can be interchangeable.

[0321] In some embodiments, the terms "downlink control information (DCI)", "downlink (DL) assignment", "DL DCI", "uplink (UL) grant", "UL DCI" and the like may be used interchangeably.

[0322] In some embodiments, terms such as "physical downlink shared channel (PDSCH)" and "DL data" can be used interchangeably, and terms such as "physical uplink shared channel (PUSCH)" and "UL data" can be used interchangeably.

[0323] In some embodiments, terms such as "moment", "time point", "time", and "time position" can be replaced with each other, and terms such as "duration", "period", "time window", "window", and "time" can be replaced with each other.

[0324] In some embodiments, terms such as wireless access scheme and waveform may be used interchangeably.

[0325] In some embodiments, “precoding,” “precoder,” “weight,” “precoding weight,” “spatial domain filter,” “phase rotation,” “antenna port,” “layer,” “the number of layers,” and “rank” are used.

[0326] In some embodiments, terms such as "frame", "radio frame", "subframe", "slot", "sub-slot", "mini-slot", "symbol", "symbol", and "transmission time interval (TTI)" can be used interchangeably.

[0327] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0328] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0329] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, or first A, etc., but not limited to this.

[0330] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a predetermined value), but is not limited thereto.

[0331] In some embodiments, "not expecting to receive" can be interpreted as not receiving on time domain resources and / or frequency domain resources, or as not performing subsequent processing on the data after receiving it; "not expecting to send" can be interpreted as not sending, or as sending but not expecting the recipient to respond to the content sent.

[0332] The communication method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2107. For example, step S2103 may be implemented as an independent embodiment, step S2104 may be implemented as an independent embodiment, step S2105 may be implemented as an independent embodiment, step S2101 and step S2104 may be implemented as independent embodiments, and step S2104, step S2105, and step S2106 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0333] In some embodiments, step S2102 and step S2103 may be executed in an exchanged order or simultaneously, and step S2105, step S2106, and step S2107 may be executed in an exchanged order or simultaneously.

[0334] In some embodiments, steps S2101 to S2103 and steps S2105 to S2107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0335] In some embodiments, steps S2101 to S2104 and steps S2106 to S2107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0336] In some embodiments, steps S2101 to S2105 and step S2107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0337] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2 .

[0338] FIG3A is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3A , the embodiment of the present disclosure relates to a communication method (terminal side), the method comprising:

[0339] Step S3101: Determine the near field area of ​​the first antenna array.

[0340] The optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0341] Step S3102: determine the second basis vector.

[0342] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0343] Step S3103: determine the first basis vector.

[0344] The optional implementation of step S3103 can refer to the optional implementation of step S2103 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0345] Step S3104: Determine the first codeword in the near-field codebook.

[0346] The optional implementation of step S3104 can refer to the optional implementation of step S2104 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0347] Step S3105: Determine whether a switch between the far-field area and the near-field area occurs, and send third information to the network device.

[0348] The optional implementation of step S3105 can refer to the optional implementation of step S2105 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0349] In some embodiments, the terminal sends the third information to the network device, but is not limited thereto, and the third information may also be sent to other entities.

[0350] Step S3106, sending the first information.

[0351] The optional implementation of step S3106 can refer to the optional implementation of step S2106 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0352] In some embodiments, the terminal sends the first information to the network device, but is not limited thereto, and the first information may also be sent to other entities.

[0353] Step S3107, sending the second information.

[0354] The optional implementation of step S3107 can refer to the optional implementation of step S2107 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0355] In some embodiments, the terminal sends the second information to the network device, but is not limited thereto, and the second information may also be sent to other entities.

[0356] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3107. For example, step S3103 may be implemented as an independent embodiment, step S3104 may be implemented as an independent embodiment, step S3105 may be implemented as an independent embodiment, step S3101 and step S3104 may be implemented as independent embodiments, and step S3104, step S3105, and step S3106 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0357] In some embodiments, step S3102 and step S3103 may be executed in an exchanged order or simultaneously, and step S3105, step S3106, and step S3107 may be executed in an exchanged order or simultaneously.

[0358] In some embodiments, steps S3101 to S3103 and steps S3105 to S3107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0359] In some embodiments, steps S3101 to S3104 and steps S3106 to S3107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0360] In some embodiments, steps S3101 to S3105 and step S3107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0361] FIG3B is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3B , the embodiment of the present disclosure relates to a communication method (terminal side), the method comprising:

[0362] Step S3201: Determine the near field area of ​​the first antenna array.

[0363] Optional implementations of step S3201 can be found in step S2101 of FIG. 2 , optional implementations of step S3101 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0364] Step S3202: Determine the second basis vector.

[0365] Optional implementations of step S3202 can be found in step S2102 of FIG. 2 , optional implementations of step S3102 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0366] Step S3203: determine the first basis vector.

[0367] Optional implementations of step S3203 may refer to step S2103 in FIG. 2 , optional implementations of step S3103 in FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0368] Step S3204: Determine the first codeword in the near-field codebook.

[0369] Optional implementations of step S3204 can be found in step S2104 of FIG. 2 , optional implementations of step S3104 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0370] Step S3205, sending the first information.

[0371] Optional implementations of step S3205 may refer to step S2106 in FIG. 2 , optional implementations of step S3106 in FIG. 3A , and other related parts in the embodiments involved in FIG. 2 and FIG. 3A , which will not be described in detail here.

[0372] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3205. For example, step S3203 may be implemented as an independent embodiment, step S3204 may be implemented as an independent embodiment, and step S3205 may be implemented as an independent embodiment. Step S3201 and step S3204 may be implemented as independent embodiments, and step S3204 and step S3205 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0373] In some embodiments, step S3202 and step S3203 may be executed in an interchangeable order or simultaneously.

[0374] In some embodiments, steps S3201 to S3203 and step S3205 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0375] In some embodiments, steps S3201 to S3204 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0376] FIG3C is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3C , the embodiment of the present disclosure relates to a communication method (terminal side), the method comprising:

[0377] Step S3301: Determine a near-field region of a first antenna array and determine a first codeword in a near-field codebook.

[0378] The optional implementation of step S3301 can be found in steps S2102 and S2104 of Figure 2, steps S3101 and S3104 of Figure 3A, and the optional implementation of steps S3201 and S3204 of Figure 3B, as well as other related parts in the embodiments involved in Figures 2, 3A, and 3B, which will not be repeated here.

[0379] Step S3302, sending the first information.

[0380] The optional implementation of step S3302 can be found in step S2106 of Figure 2, step S3106 of Figure 3A, the optional implementation of step S3302 of Figure 3B, and other related parts in the embodiments involved in Figures 2, 3A, and 3B, which will not be repeated here.

[0381] The communication method involved in the embodiment of the present disclosure may include at least one of steps S3201 and S3202. For example, step S3301 may be implemented as an independent embodiment, and step S3302 may be implemented as an independent embodiment.

[0382] In some embodiments, the terminal determines that it is in a near-field area, determines a first codeword in a near-field codebook, the near-field codebook is determined based on a candidate first basis vector, and the candidate first basis vector is a basis vector used in the near-field area;

[0383] The terminal sends first information to the network device, where the first information is used to indicate a first codeword.

[0384] In some embodiments, the near-field codebook is determined based on a candidate first basis vector and a candidate second basis vector, where the candidate second basis vector is a basis vector of the codebook used when the terminal is in a far-field region.

[0385] In some embodiments, the candidate first basis vector includes a basis vector of a horizontal dimension and a basis vector of a vertical dimension, and the candidate first basis vector is the Kronecker product of the basis vector of the horizontal dimension and the basis vector of the vertical dimension in the candidate first basis vector; the candidate second basis vector includes a basis vector of a horizontal dimension and a basis vector of a vertical dimension, and the candidate second basis vector is the Kronecker product of the basis vector of the horizontal dimension and the basis vector of the vertical dimension in the candidate second basis vector.

[0386] In some embodiments, the first antenna array of the network device is any one of the following: a uniform linear array; a uniform planar array.

[0387] In some embodiments, the number of antenna ports in the horizontal dimension of the first antenna array is N1, and the number of antenna ports in the vertical dimension is N2, where N1 is greater than or equal to 1, and N2 is greater than or equal to 1.

[0388] In some embodiments, the candidate first basis vector is determined based on distance parameters, the distance parameters including at least one first distance parameter in the horizontal dimension and at least one second distance parameter in the vertical dimension, and the n′1th element in the basis vector v″ in the horizontal dimension of the candidate first basis vector for: The n′2th element in the basis vector u″ of the vertical dimension in the candidate first basis vector for: Among them, n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension, n′1=n1+(N1+1) / 2, n′2=n2+(N2+1) / 2; o1 represents the first distance parameter corresponding to the candidate first basis vector, o2 represents the second distance parameter corresponding to the candidate first basis vector, O3 represents the oversampling factor of the distance parameter in the horizontal dimension, O4 represents the oversampling factor of the distance parameter in the vertical dimension, o1=1,2,…,N3O3, o2=1,2,…,N4O4; j is an imaginary unit, λ represents the wavelength of the wireless signal, d x Denotes the horizontal antenna spacing of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D x Denotes the horizontal dimension length of the first antenna array, D z Represents the vertical dimension length of the first antenna array.

[0389] In some embodiments, and The n′1th element in the horizontal dimension of the basis vector v″ in the candidate first basis vector for: The n′2th element in the basis vector u″ of the vertical dimension in the candidate first basis vector for:

[0390] In some embodiments, the candidate second basis vector is determined based on angle parameters, the angle parameters including a first angle parameter of at least one horizontal dimension and a second angle parameter of at least one vertical dimension, and the n′1th element of the basis vector v′ in the horizontal dimension of the candidate second basis vector is for: The n′2th element in the basis vector u′ of the vertical dimension of the candidate second basis vector for: Among them, l represents the first angle parameter corresponding to the candidate second basis vector, m represents the second angle parameter corresponding to the candidate second basis vector, O1 represents the oversampling factor of the angle parameter in the horizontal dimension, O2 represents the oversampling factor of the angle parameter in the vertical dimension, l = 0, 1, ..., N1O1-1, m = 0, 1, ..., N2O2-1.

[0391] 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.

[0392] 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.

[0393] In some embodiments, the candidate second basis vectors are the same as discrete Fourier transform (DFT) basis vectors in a downlink (DL) Type 1 codebook.

[0394] In some embodiments, the terminal determines that it is in the near field area, including at least one of the following: the terminal determines that it is in the near field area only in the horizontal dimension; the terminal determines that it is in the near field area only in the vertical dimension; the terminal determines that it is in the near field area in both the horizontal dimension and the vertical dimension.

[0395] In some embodiments, the near-field codebook includes at least one of the following: a first near-field codebook, which is a codebook used by the terminal only when the horizontal dimension is in the near-field area; a second near-field codebook, which is a codebook used by the terminal only when the vertical dimension is in the near-field area; and a third near-field codebook, which is a codebook used when the terminal is in the near-field area in both the horizontal and vertical dimensions.

[0396] In some embodiments, the near-field codebook is used for single-polarization single-layer transmission; or, the near-field codebook is used for dual-polarization multi-layer transmission.

[0397] In some embodiments, the method 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.

[0398] In some embodiments, the terminal determines a first codeword in a near-field codebook, including: the terminal determining a first basis vector and a second basis vector; and the terminal determining the first codeword based on the first basis vector and the second basis vector.

[0399] In some embodiments, the method includes: the terminal determines that a switch between the far-field area and the near-field area occurs, and sends third information to the network device, where the third information is used to indicate whether the second basis vector changes.

[0400] In some embodiments, the terminal determines that a switch occurs between the far field area and the near field area, including at least one of the following: the terminal determines that the switch occurs from the near field area to the far field area in the horizontal dimension; the terminal determines that the switch occurs from the near field area to the far field area in the vertical dimension; the terminal switches from the near field area to the far field area in both the horizontal dimension and the vertical dimension; the terminal determines that the switch occurs from the far field area to the near field area in the horizontal dimension; the terminal determines that the switch occurs from the far field area to the near field area in the vertical dimension; the terminal switches from the far field area to the near field area in both the horizontal dimension and the vertical dimension.

[0401] 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), the method comprising:

[0402] Step S4101, obtain third information.

[0403] The optional implementation of step S4101 can refer to the optional implementation of step S2105 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0404] In some embodiments, the network device receives the third information sent by the terminal, but is not limited thereto and may also receive the third information sent by other entities.

[0405] In some embodiments, the network device obtains third information specified by the protocol.

[0406] In some embodiments, the network device obtains the third information from upper layer(s).

[0407] In some embodiments, the network device performs processing to obtain the third information.

[0408] In some embodiments, step S4101 is omitted, and the terminal autonomously implements the function indicated by the third information, or the above function is default or by default.

[0409] Step S4102, obtaining first information.

[0410] The optional implementation of step S4102 can refer to the optional implementation of step S2106 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0411] 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.

[0412] In some embodiments, the network device obtains first information specified by a protocol.

[0413] In some embodiments, the network device obtains the first information from an upper layer(s).

[0414] In some embodiments, the network device performs processing to obtain the first information.

[0415] Step S4103, obtain the second information.

[0416] The optional implementation of step S4103 can refer to the optional implementation of step S2107 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0417] 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.

[0418] In some embodiments, the network device obtains second information specified by the protocol.

[0419] In some embodiments, the network device obtains the second information from an upper layer(s).

[0420] In some embodiments, the network device performs processing to obtain the second information.

[0421] In some embodiments, step S4103 is omitted, and the terminal autonomously implements the function indicated by the second information, or the above function is default or by default.

[0422] The communication method involved in the embodiments of the present disclosure may include at least one of steps S4101 to S4103. For example, step S4101 may be implemented as an independent embodiment, step S4102 may be implemented as the same independent embodiment, step S4101 and step S4102 may be implemented as independent embodiments, and step S4102 and step S4103 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0423] In some embodiments, step S4102 and step S4103 may be executed in an interchangeable order or simultaneously.

[0424] In some embodiments, steps S4101 to S4102 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0425] In some embodiments, step S4101 and step S4103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0426] FIG4B is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4B , the embodiment of the present disclosure relates to a communication method (network device side), the method comprising:

[0427] Step S4201, obtain third information.

[0428] The optional implementation of step S4201 can refer to step S2105 in Figure 2, the optional implementation of step S4101 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0429] Step S4202, obtaining first information.

[0430] The optional implementation of step S4202 can refer to step S2106 in FIG. 2 , the optional implementation of step S4102 in FIG. 4A , and other related parts in the embodiments involved in FIG. 2 and FIG. 4A , which will not be described in detail here.

[0431] The communication method involved in the embodiment of the present disclosure may include at least one of steps S4201 and S4202. For example, step S4201 may be implemented as an independent embodiment, and step S4202 may be implemented as the same independent embodiment.

[0432] In some embodiments, step S4201 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0433] In some embodiments, step S4202 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0434] FIG4C is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4C , the embodiment of the present disclosure relates to a communication method (network device side), the method comprising:

[0435] Step S4301, obtain first information.

[0436] The optional implementation of step S4301 can be found in the optional implementation of step S2106 in Figure 2, step S4102 in Figure 4A, step S4202 in Figure 4B, and other related parts in the embodiments involved in Figures 2, 4A, and 4B, which will not be repeated here.

[0437] In some embodiments, a network device receives first information sent by a terminal, where the first information is used to indicate a first codeword. The first codeword is a codeword in a near-field codebook, and the near-field codebook is determined based on a candidate first basis vector, where the candidate first basis vector is a basis vector used for the near-field area.

[0438] In some embodiments, the near-field codebook is obtained by multiplying the candidate first basis vectors by the second basis vectors.

[0439] In some embodiments, the candidate first basis vectors include basis vectors in a horizontal dimension and basis vectors in a vertical dimension, and the candidate first basis vectors are Kronecker products of the basis vectors in the horizontal dimension and the basis vectors in the vertical dimension in the candidate first basis vectors;

[0440] The candidate second basis vectors include basis vectors in the horizontal dimension and basis vectors in the vertical dimension, and the candidate second basis vectors are the Kronecker products of the basis vectors in the horizontal dimension and the basis vectors in the vertical dimension among the candidate second basis vectors.

[0441] In some embodiments, the first antenna array is any one of the following: a uniform linear array; a uniform planar array.

[0442] In some embodiments, the number of antenna ports in the horizontal dimension of the first antenna array is N1, and the number of antenna ports in the vertical dimension is N2, where N1 is greater than or equal to 1, and N2 is greater than or equal to 1.

[0443] In some embodiments, the candidate first basis vectors are determined based on distance parameters, the distance parameters including at least one first distance parameter in a horizontal dimension and at least one second distance parameter in a vertical dimension.

[0444] The n′1th element in the horizontal dimension of the basis vector v″ in the candidate first basis vector for: The n′2th element in the basis vector u″ of the vertical dimension in the candidate first basis vector Among them, n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension, n′1=n1+(N1+1) / 2, n′2=n2+(N2+1) / 2; o1 represents the first distance parameter corresponding to the candidate first basis vector, o2 represents the second distance parameter corresponding to the candidate first basis vector, O3 represents the oversampling factor of the distance parameter in the horizontal dimension, O4 represents the oversampling factor of the distance parameter in the vertical dimension, o1=1,2,…,N3O3, o2=1,2,…,N4O4; j is an imaginary unit, λ represents the wavelength of the wireless signal, d x Denotes the horizontal antenna spacing of the first antenna array, d z Denotes the vertical dimension of the first antenna array antenna spacing, D x Denotes the horizontal dimension length of the first antenna array, D z Represents the vertical dimension length of the first antenna array.

[0445] In some embodiments, and The n′1th element in the horizontal dimension of the basis vector v″ in the candidate first basis vector for: The n′2th element in the basis vector u″ of the vertical dimension in the candidate first basis vector for:

[0446] In some embodiments, the candidate second basis vector is determined based on angle parameters, the angle parameters including a first angle parameter of at least one horizontal dimension and a second angle parameter of at least one vertical dimension, and the n′1th element of the basis vector v′ in the horizontal dimension of the candidate second basis vector is for: The n′2th element in the basis vector u′ of the vertical dimension of the candidate second basis vector for: Among them, l represents the first angle parameter corresponding to the candidate second basis vector, m represents the second angle parameter corresponding to the candidate second basis vector, O1 represents the oversampling factor of the angle parameter in the horizontal dimension, O2 represents the oversampling factor of the angle parameter in the vertical dimension, l = 0, 1, ..., N1O1-1, m = 0, 1, ..., N2O2-1.

[0447] 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.

[0448] 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.

[0449] In some embodiments, the candidate second basis vectors are the same as discrete Fourier transform (DFT) basis vectors in the downlink (DL) Type 1 codebook.

[0450] In some embodiments, the terminal is in the near field area of ​​the first antenna array, including at least one of the following: the terminal is in the near field area only in the horizontal dimension; the terminal is in the near field area only in the vertical dimension; the terminal is in the near field area in both the horizontal dimension and the vertical dimension.

[0451] In some embodiments, the near-field codebook includes at least one of the following: a first near-field codebook, which is a codebook used by the terminal only when the horizontal dimension is in the near-field area; a second near-field codebook, which is a codebook used by the terminal only when the vertical dimension is in the near-field area; and a third near-field codebook, which is a codebook used when the terminal is in the near-field area in both the horizontal and vertical dimensions.

[0452] In some embodiments, the near-field codebook is used for single-polarization single-layer transmission; or the near-field codebook is used for dual-polarization multi-layer transmission, and the near-field codebook is constructed based on candidate first basis vectors, candidate second basis vectors, and common phase coefficients.

[0453] In some embodiments, the method 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.

[0454] In some embodiments, the method includes: the network device receives third information sent by the terminal, where the third information is used to indicate whether the second basis vector has changed.

[0455] Figure 5 is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 5, the embodiment of the present disclosure relates to a communication method, and the method includes:

[0456] Step S5101: The terminal determines that it is in a near-field area of ​​a first antenna array and determines a first codeword in a near-field codebook.

[0457] For the optional implementation of step S5101, please refer to steps S2102 and S2104 in Figure 2, steps S3101 and S3104 in Figure 3A, steps S3201 and S3204 in Figure 3B, the optional implementation of step S3301 in Figure 3C, and other related parts in the embodiments involved in Figures 2, 3A, 3B, 3C, 4A, 4B, and 4C, which will not be repeated here.

[0458] Step S5102: The terminal sends first information to the network device.

[0459] For the optional implementation of step S5101, please refer to step S2106 of Figure 2, step S3106 of Figure 3A, step S3205 of Figure 3B, step S3302 of Figure 3C, step S4102 of Figure 4A, step S4202 of Figure 4B, and the optional implementation of step S4301 of Figure 4C, as well as other related parts in the embodiments involved in Figures 2, 3A, 3B, 3C, 4A, 4B, and 4C, which will not be repeated here.

[0460] In some embodiments, the above method may include the method described in the above terminal side and network device side embodiments, which will not be repeated here.

[0461] Figure 6 is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 6, the embodiment of the present disclosure relates to a communication method, and the method includes:

[0462] Step S6101: The terminal is in the near-field area of ​​the first antenna array and determines a first codeword from a near-field codebook.

[0463] In some embodiments, the first antenna array may be a uniform linear array or a uniform planar array.

[0464] For a uniform linear array:

[0465] In some embodiments, the n′1th element of the precoding vector v in the near-field codebook may be calculated as: Where N1 and N3 represent the number of sampling points in the horizontal dimension angle domain and the horizontal dimension distance domain respectively, O1 and O3 represent the oversampling factors in the horizontal dimension angle domain and the horizontal dimension distance domain respectively, l = 0, 1, ..., N1O1-1 and o1 = 1, 2, ..., N3O3.

[0466] The near-field codebook can be designed as the multiplication of the codeword vectors corresponding to two codebooks, that is, the near-field codebook can be calculated as The codebook The codebook is the same as the DFT basis vector in the DL Type I codebook in the related art. is a term introduced when considering near-field spherical waves.

[0467] For example, assuming the antenna array horizontal dimension antenna spacing is Horizontal dimension of antenna array Then the precoding vector in the near-field codebook can be calculated as:

[0468] It is understandable that the codebook It can be the second codebook in the above embodiment, codebook It can be the first codebook in the above embodiment.

[0469] In some embodiments, the terminal may determine whether it is in a near-field region in the horizontal dimension.

[0470] In some embodiments, the network device sends a CSI-RS to the terminal, and the terminal performs channel estimation through the CSI-RS and determines whether it is in a near-field area.

[0471] In some embodiments, if the terminal is in a far-field area, the terminal selects an optimal codebook from the far-field codebook according to an algorithm, and feeds it back to the network device through UCI.

[0472] In some embodiments, if the terminal is in the near-field area, the terminal selects the optimal codebook from the near-field codebook according to the algorithm and determines the corresponding two-stage codebook, and feeds it back to the network device through UCI, for example, indicating different feedback parameters through the following information field:

[0473] pass Bit indication l=0,…N1O1-1, using broadband or sub-band feedback; The bit indication o1=1,…N3O3-1 or o1=1,…N3O3 adopts broadband or sub-band feedback; the common phase coefficient is indicated by 1, 2 or 3 bits, corresponding to the BPSK, QPSK and 8-PSK common phase coefficients respectively, adopting broadband or sub-band feedback.

[0474] In some embodiments, the terminal generates codewords corresponding to two-stage codebooks according to the UCI and multiplies them to obtain a complete near-field codeword.

[0475] In some embodiments, when the terminal switches between the near-field area and the far-field area, an additional 1-bit field may be introduced to indicate whether the far-field codeword has changed. If not, the UCI corresponding to the far-field codeword does not need to be updated.

[0476] For uniform arrays:

[0477] In some embodiments, the precoding vector can be designed as The n′1th element of the precoding vector v and the n′2th element of the precoding vector u can be calculated as:

[0478] Where N1, N2, N3 and N4 represent the number of sampling points in the horizontal dimension angle domain, vertical dimension angle domain, horizontal dimension distance domain and vertical dimension distance domain respectively, O1, O2, O3 and O4 represent the oversampling factors in the horizontal dimension angle domain, vertical dimension angle domain, horizontal dimension distance domain and vertical dimension distance domain respectively, l = 0, 1, ..., N1O1-1, m = 0, 1, ..., N2O2-1, o1 = 1, 2, ..., N3O3 and o2 = 1, 2, ..., N4O4.

[0479] In some embodiments, the near-field codebook can be designed as the multiplication of the codeword vectors corresponding to two codebooks, and the horizontal dimension codebook can be calculated as The vertical dimension codebook can be calculated as The codebook and The codebook is the same as the DFT basis vector in the DL Type I codebook in the related art. and is a term introduced when considering near-field spherical waves.

[0480] For example, suppose the antenna array horizontal and vertical antenna spacing is The horizontal and vertical lengths of the antenna array are and Then the precoding vectors v and u can be calculated as:

[0481] Among them, the codebook and It can be the second codebook in the above embodiment, codebook and It can be the first codebook in the above embodiment.

[0482] In some embodiments, the terminal may determine whether it is in a near-field region in the horizontal dimension and / or the vertical dimension.

[0483] In some embodiments, the network device sends a CSI-RS, and the terminal performs channel estimation through the CSI-RS and determines whether the terminal is in a near-field area.

[0484] The terminal can determine whether it is in the near field in the horizontal and vertical dimensions respectively. Since the number of antennas in the horizontal dimension is generally defined to be greater than the number of antennas in the vertical dimension, the first three of the following four states are the most common states:

[0485] Both the horizontal dimension and the vertical dimension are in the far field area; the horizontal dimension is in the near field area, and the vertical dimension is in the far field area; both the horizontal dimension and the vertical dimension are in the near field area; the horizontal dimension is in the far field area, and the vertical dimension is in the near field area.

[0486] In some embodiments, if the terminal is in a far-field area in the horizontal or vertical dimension, the UE selects the optimal codebook from the far-field codebook according to the algorithm and feeds it back to the network device through UCI.

[0487] In some embodiments, if the terminal is in the near field area in the horizontal or vertical dimension, the UE selects the optimal codebook from the near field codebook according to the algorithm and determines the corresponding two-level codebook, and feeds it back to the network device through UCI, for example, by indicating different feedback parameters through the following information field: Bit indication l=0,…N1O1-1, using broadband or sub-band feedback; Bit indication m=0,…N2O2-1, using broadband or sub-band feedback; Bit indication o1=1,…N3O3-1 or o1=1,…N3O3, using broadband or sub-band feedback; The bit indication o2=1,…N4O4-1 or o2=1,…N4O4 adopts broadband or sub-band feedback; the common phase coefficient is indicated by 1, 2 or 3 bits, corresponding to the common phase coefficient of BPSK, QPSK and 8-PSK respectively, adopts broadband or sub-band feedback.

[0488] In some embodiments, the terminal generates codewords corresponding to two-stage codebooks according to the UCI and multiplies them to obtain a complete near-field codeword.

[0489] In some embodiments, when the terminal switches between the near-field area and the far-field area, an additional 1-bit field may be introduced to indicate whether the far-field codeword has changed. If not, the UCI corresponding to the far-field codeword does not need to be updated.

[0490] In the embodiments of the present disclosure, some or all of the steps and their optional implementations may be arbitrarily combined with some or all of the steps in other embodiments, or may be arbitrarily combined with the optional implementations of other embodiments.

[0491] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network function node, a core network device, a terminal, a network device, etc.) in any of the above methods.

[0492] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0493] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0494] Figure 7A is a structural diagram of the terminal proposed in an embodiment of the present disclosure. As shown in Figure 7A, the terminal 7100 may include: at least one of a transceiver module 7101, a processing module 7102, etc. In some embodiments, the processing module 7102 is used to determine the near-field area in the first antenna array, and determine the first codeword in the near-field codebook, the near-field codebook is determined based on the candidate first basis vector, and the candidate first basis vector is the basis vector used for the near-field area; the transceiver module 7101 is used to send first information to the network device, and the first information is used to indicate the first codeword. Optionally, the transceiver module 7101 is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S2105, step S2106, step S2107, but not limited to this) performed 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 (eg, step S2101, step S2102, step S2103, step S2104, step S2105) executed by the terminal in any of the above methods, which will not be repeated here.

[0495] Figure 7B is a structural diagram of the network device proposed in an embodiment of the present disclosure. As shown in Figure 7B, the network device 7200 may include: at least one of a transceiver module 7201, a processing module 7202, etc. In some embodiments, the above-mentioned transceiver module 7201 is used to receive the first information sent by the terminal, and the first information is used to indicate the first codeword, and the first codeword is a codeword in the near-field codebook, and the near-field codebook is determined according to the candidate first basis vector, and the candidate first basis vector is the basis vector used for the near-field area. Optionally, the above-mentioned transceiver module 7201 is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S2105, step S2106, step S2107, but not limited to this) performed by the network device in any of the above methods, which will not be repeated here. Optionally, the above-mentioned processing module 7202 is used to execute at least one of the other steps performed by the network device in any of the above methods, which will not be repeated here.

[0496] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0497] In some embodiments, the processing module can be a single module or can 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 interchangeable with the processor.

[0498] Figure 8A is a schematic diagram of the structure of a communication device 8100 proposed in an embodiment of the present disclosure. Communication device 8100 can be a network device (e.g., an access network device, a core network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. Communication device 8100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0499] As shown in Figure 8A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 8100 is used to perform any of the above methods. Optionally, one or more processors 8101 are used to call instructions to enable the communication device 8100 to perform any of the above methods.

[0500] 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 (e.g., step S2105, step S2106, step S2107, but not limited thereto) such as sending and / or receiving in the above method, and the processor 8101 performs at least one of the other steps (e.g., step S2101, step S2102, step S2103, step S2104, step S2105, but not limited thereto). In an optional embodiment, the transceiver may include a receiver and / or a transmitter, and the receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface may be interchangeable, the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be interchangeable, and the terms receiver, receiving unit, receiver, and receiving circuit may be interchangeable.

[0501] In some embodiments, the communication device 8100 further includes one or more memories 8103 for storing data. Alternatively, all or part of the memories 8103 may be located outside the communication device 8100. In alternative embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuits 8104 are connected to the memory 8102 and may be configured to receive data from the memory 8102 or other devices, or to send data to the memory 8102 or other devices. For example, the interface circuits 8104 may read data stored in the memory 8102 and send the data to the processor 8101.

[0502] The communication device 8100 described in the above embodiment may be a network device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 8A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0503] FIG8B is a schematic diagram of the structure of a chip 8200 according to an embodiment of the present disclosure. If the communication device 8100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 8200 shown in FIG8B , but the present disclosure is not limited thereto.

[0504] The chip 8200 includes one or more processors 8201. The chip 8200 is configured to execute any of the above methods.

[0505] In some embodiments, chip 8200 further includes one or more interface circuits 8202. Terms such as interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 8200 further includes one or more memories 8203 for storing data. Alternatively, all or part of memory 8203 may be located external to chip 8200. Optionally, interface circuit 8202 is connected to memory 8203 and may be used to receive data from memory 8203 or other devices, or may be used to send data to memory 8203 or other devices. For example, interface circuit 8202 may read data stored in memory 8203 and send the data to processor 8201.

[0506] In some embodiments, the interface circuit 8202 performs at least one of the communication steps (e.g., steps S2105, S2106, and S2107) of the aforementioned method. The interface circuit 8202 performing the communication steps (e.g., steps S2105, S2106, and S2107) of the aforementioned method, for example, means that the interface circuit 8202 performs data exchange 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 (e.g., steps S2101, S2102, S2103, S2104, and S2105, but not limited thereto).

[0507] The modules and / or devices described in various embodiments, such as virtual devices, physical devices, and chips, can be arbitrarily combined or separated according to circumstances. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0508] The present disclosure also proposes a storage medium having instructions stored thereon, which, when executed on the communication device 8100, causes the communication device 8100 to execute any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto, and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto, and may also be a temporary storage medium.

[0509] The present disclosure also provides a program product, which, when executed by the communication device 8100, enables the communication device 8100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0510] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

Claims

1. A communication method, characterized in that, The method includes: The terminal determines that the terminal is in the near - field region, determines a first codeword in the near - field codebook, where the near - field codebook is determined according to candidate first basis vectors, and the candidate first basis vectors are basis vectors for the near - field region; The terminal sends first information to a network device, and the first information is used to indicate the first codeword.

2. The method according to claim 1, wherein The near - field codebook is determined based on the candidate first basis vectors and candidate second basis vectors, and the candidate second basis vectors are basis vectors of the codebook used when the terminal is in the far - field region.

3. The method according to claim 1 or 2, wherein, The candidate first basis vectors include basis vectors in the horizontal dimension and basis vectors in the vertical dimension, and the candidate first basis vectors are the Kronecker product of the basis vectors in the horizontal dimension and the basis vectors in the vertical dimension among the candidate first basis vectors; The candidate second basis vectors include basis vectors in the horizontal dimension and basis vectors in the vertical dimension, and the candidate second basis vectors are the Kronecker product of the basis vectors in the horizontal dimension and the basis vectors in the vertical dimension among the candidate second basis vectors.

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

5. The method according to claim 4, wherein The candidate first basis vectors are determined based on distance parameters, and the distance parameters include at least one first distance parameter in the horizontal dimension and at least one second distance parameter in the vertical dimension, The n'1-th element of the basis vector v″ in the horizontal dimension among the candidate first basis vectors is: The n'2-th element of the basis vector u″ in the vertical dimension among the candidate first basis vectors is: where n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension, n′1=n1+(N1 + 1) / 2, n′2=n2+(N2 + 1) / 2; o1 represents the first distance parameter corresponding to the candidate first basis vectors, o2 represents the second distance parameter corresponding to the candidate first basis vectors, O3 represents the oversampling factor of the distance parameters in the horizontal dimension, O4 represents the oversampling factor of the distance parameters in the vertical dimension, o1 = 1, 2, …, N3O3, o2 = 1, 2, …, N4O4; j is the imaginary unit, λ represents the wavelength of the wireless signal, d x represents the antenna spacing in the horizontal dimension of the first antenna array, d z represents the antenna spacing in the vertical dimension of the first antenna array, D x represents the length in the horizontal dimension of the first antenna array, D z represents the length in the vertical dimension of the first antenna array.

6. The method according to claim 5, wherein and The n′1-th element of the basis vector v″ in the horizontal dimension among the candidate first basis vectors is: The n'2-th element of the basis vector u″ in the vertical dimension among the candidate first basis vectors is:

7. The method according to claim 5 or 6, characterized in that, The candidate second basis vectors are determined based on angle parameters, and the angle parameters include at least one first angle parameter in the horizontal dimension and at least one second angle parameter in the vertical dimension, The n′1-th element of the basis vector v′ in the horizontal dimension among the candidate second basis vectors It is: The n'2-th element of the basis vector u' in the vertical dimension among the candidate second basis vectors is: where l represents the first angle parameter corresponding to the candidate second basis vectors, m represents the second angle parameter corresponding to the candidate second basis vectors, O1 represents the oversampling factor of the angle parameters in the horizontal dimension, O2 represents the oversampling factor of the angle parameters in the vertical dimension, l = 0, 1, …, N1O1 - 1, m = 0, 1, …, N2O2 - 1.

8. The method according to any one of claims 1-7, characterized in that, The first information includes at least one of the following: A first indication field, and the first indication field is used to indicate the first angle parameter corresponding to the first codeword; A second indication field, and the second indication field is used to indicate the second angle parameter corresponding to the first codeword; A third indication field, and the third indication field is used to indicate the first distance parameter corresponding to the first codeword; A fourth indication field, and the fourth indication field is used to indicate the second distance parameter corresponding to the first codeword.

9. The method according to claim 8, wherein, The first indication field at least includes bits; The second indication field at least includes bits; The third indication field at least includes bits; The fourth indication field at least includes bits.

10. The method according to any one of claims 1-9, characterized in that, The candidate second basis vector is the same as the discrete Fourier transform (DFT) basis vector in the downlink DL type I codebook.

11. According to the method described in any one of claims 1-11, characterized in that, The terminal determines that it is in the near-field region of the first antenna array, including at least one of the following: The terminal determines that it is only in the horizontal dimension in the near-field region; The terminal determines that it is only in the vertical dimension in the near-field region; The terminal determines that it is in the near-field region in both the horizontal dimension and the vertical dimension.

12. The method according to claim 11, wherein The near-field codebook includes at least one of the following: A first near-field codebook, which is a codebook used by the terminal when it is only in the horizontal dimension in the near-field region; A second near-field codebook, which is a codebook used by the terminal when it is only in the vertical dimension in the near-field region; A third near-field codebook, which is a codebook used by the terminal when it is in the near-field region in both the horizontal dimension and the vertical dimension.

13. The method according to any one of claims 1-12, characterized in that, The near-field codebook is used for single-polarization single-layer transmission; or, The near-field codebook is used for dual-polarization multi-layer transmission.

14. The method according to claim 13, wherein The method includes: The terminal sends second information to the network device, and the second information is used to indicate the co-phase coefficient corresponding to the first codeword.

15. The method according to any one of claims 1 to 14, characterized in that, The terminal determines the first codeword in the near-field codebook, including: The terminal determines a first basis vector and a candidate second basis vector; The terminal determines the first codeword according to the first basis vector and the second basis vector.

16. The method according to claim 15, wherein The method includes: When the terminal determines that there is a handover between the far-field region and the near-field region, it sends third information to the network device, and the third information is used to indicate whether the second basis vector changes.

17. The method according to claim 16, wherein The terminal determines that there is a handover between the far-field region and the near-field region, including at least one of the following: The terminal determines that it switches from the near-field region to the far-field region in the horizontal dimension; The terminal determines that it switches from the near-field region to the far-field region in the vertical dimension; The terminal switches from the near-field region to the far-field region in both the horizontal dimension and the vertical dimension; The terminal determines that it switches from the far-field region to the near-field region in the horizontal dimension; The terminal determines that it switches from the far-field region to the near-field region in the vertical dimension; The terminal switches from the far-field region to the near-field region in both the horizontal dimension and the vertical dimension.

18. A communication method, characterized in that, The method includes: The network device receives first information sent by the terminal, and the first information is used to indicate a first codeword, where the first codeword is a codeword in the near-field codebook, and the near-field codebook is determined according to a candidate first basis vector, and the candidate first basis vector is the basis vector used for the near-field region.

19. The method according to claim 18, wherein The near-field codebook is determined based on the candidate first basis vector and the second basis vector, and the candidate second basis vector is the basis vector of the codebook used by the terminal when it is in the far-field region.

20. The method according to claim 18 or 19, wherein The candidate first basis vector includes a basis vector in the horizontal dimension and a basis vector in the vertical dimension, and the candidate first basis vector is the Kronecker product of the basis vector in the horizontal dimension and the basis vector in the vertical dimension in the candidate first basis vector; The candidate second basis vector includes a basis vector in the horizontal dimension and a basis vector in the vertical dimension, and the candidate second basis vector is the Kronecker product of the basis vector in the horizontal dimension and the basis vector in the vertical dimension among the candidate second basis vectors.

21. The method according to any one of claims 18 - 20, characterized in that, The number of antenna ports in the horizontal dimension of the first antenna array of the network device is N1, and the number of antenna ports in the vertical dimension is N2, where N1 is greater than or equal to 1 and N2 is greater than or equal to 1.

22. The method according to claim 21, wherein The candidate first basis vector is determined based on distance parameters, and the distance parameters include at least one first distance parameter in the horizontal dimension and at least one second distance parameter in the vertical dimension. The n'1-th element of the basis vector v″ in the horizontal dimension among the candidate first basis vectors is: The n'2-th element of the basis vector u″ in the vertical dimension among the candidate first basis vectors is: Where n1 represents the index of the antenna port in the horizontal dimension, n2 represents the index of the antenna port in the vertical dimension, n′1 = n1+(N1 + 1) / 2, n′2 = n2+(N2 + 1) / 2; o1 represents the first distance parameter corresponding to the candidate first basis vector, o2 represents the second distance parameter corresponding to the candidate first basis vector, O3 represents the oversampling factor of the distance parameter in the horizontal dimension, O4 represents the oversampling factor of the distance parameter in the vertical dimension, o1 = 1, 2, …, N3O3, o2 = 1, 2, …, N4O4; j is the imaginary unit, λ represents the wavelength of the wireless signal, and d x represents the antenna spacing in the horizontal dimension of the first antenna array, and d z Indicates the vertical dimension antenna spacing of the first antenna array, D x Indicates the horizontal dimension length of the first antenna array, D z Indicates the vertical dimension length of the first antenna array.

23. The method according to claim 22, wherein and The n'1-th element of the basis vector v″ in the horizontal dimension among the candidate first basis vectors is: The n'2-th element of the basis vector u″ in the vertical dimension among the candidate first basis vectors is:

24. The method according to claim 22 or 23, characterized in that The candidate second basis vector is determined based on angle parameters, and the angle parameters include at least one first angle parameter in the horizontal dimension and at least one second angle parameter in the vertical dimension. The n'1-th element of the basis vector v' in the horizontal dimension among the candidate second basis vectors is: The n'2-th element of the basis vector u' in the vertical dimension among the candidate second basis vectors It is: Where l represents the first angle parameter corresponding to the candidate second basis vector, m represents the second angle parameter corresponding to the candidate second basis vector, O1 represents the oversampling factor of the angle parameter in the horizontal dimension, O2 represents the oversampling factor of the angle parameter in the vertical dimension, l = 0, 1, …, N1O1 - 1, m = 0, 1, …, N2O2 - 1.

25. The method according to any one of claims 18 - 24, characterized in that, The first information includes at least one of the following: A first indication field, which is used to indicate the first angle parameter corresponding to the first codeword; A second indication field, which is used to indicate the second angle parameter corresponding to the first codeword; A third indication field, which is used to indicate the first distance parameter corresponding to the first codeword; A fourth indication field, which is used to indicate the second distance parameter corresponding to the first codeword.

26. According to the method of claim 25, wherein The first indication field at least includes bits; The second indication field at least includes bits; The third indication field at least includes bits; The fourth indication field at least includes bits.

27. The method according to any one of claims 18 - 26, characterized in that, The candidate second basis vector is the same as the discrete Fourier transform (DFT) basis vector in the downlink DL type I codebook.

28. The method according to any one of claims 18 - 27, characterized in that, The terminal is in the near - field region of the first antenna array, including at least one of the following: The terminal is only in the near - field region in the horizontal dimension; The terminal is only in the near - field region in the vertical dimension; The terminal is in the near - field region in both the horizontal dimension and the vertical dimension.

29. The method according to claim 28, wherein The near - field codebook includes at least one of the following: A first near - field codebook, which is the codebook used when the terminal is only in the near - field region in the horizontal dimension; A second near - field codebook, which is the codebook used when the terminal is only in the near - field region in the vertical dimension; The third near-field codebook, where the third near-field codebook is the codebook used by the terminal when it is in the near-field region in both the horizontal and vertical dimensions.

30. The method according to any one of claims 18 - 29, characterized in that, The near-field codebook is used for single-polarization single-layer transmission; or, The near-field codebook is used for dual-polarization multi-layer transmission.

31. The method according to claim 30, wherein The method includes: The network device receives second information sent by the terminal, where the second information is used to indicate the co-phase coefficient corresponding to the first codeword.

32. The method according to any one of claims 18-31, characterized in that, The method includes: The network device receives third information sent by the terminal, where the third information is used to indicate whether the second basis vector changes.

33. A terminal, characterized in that, The terminal includes: A processing module, configured to determine that the terminal is in the near-field region, and determine a first codeword in the near-field codebook, where the near-field codebook is determined according to candidate first basis vectors, and the candidate first basis vectors are the basis vectors used in the near-field region; A transceiver module, configured to send first information to the network device, where the first information is used to indicate the first codeword.

34. A network device, characterized in that, The network device includes: A transceiver module, configured to receive first information sent by the terminal, where the first information is used to indicate a first codeword, and the first codeword is a codeword in the near-field codebook, and the near-field codebook is determined according to candidate first basis vectors, and the candidate first basis vectors are the basis vectors used in the near-field region.

35. A communication method, characterized in that, The method is applied to a communication system, where the communication system includes a terminal and a network device, and the method includes: The terminal determines that the terminal is in the near-field region, and determines a first codeword in the near-field codebook, where the near-field codebook is determined according to candidate first basis vectors, and the candidate first basis vectors are the basis vectors used in the near-field region.

36. The method according to claim 35, characterized in that, The method includes: The terminal sends first information to the network device; where the first information is used to indicate the first codeword, or the first information is used to indicate the near-field codebook.

37. The method according to claim 35 or 36, characterized in that, The method includes: The terminal sends second information to the network device; where the second information is used to indicate the co-phase coefficient corresponding to the first codeword.

38. The method according to any one of claims 35 to 37, characterized in that, The method includes: The network device receives third information sent by the terminal; where the third information is used to indicate that the terminal switches between the far-field region and the near-field region.

39. A terminal, characterized in that, Includes: One or more processors; A memory coupled to the one or more processors, where the memory includes executable instructions that, when executed by the one or more processors, cause the terminal to execute the communication method according to any one of claims 1-17.

40. A network device, characterized in that, Includes: One or more processors; A memory coupled to the one or more processors, where the memory includes executable instructions that, when executed by the One or more processors, cause the network device to execute the communication method according to claims 18-32.

41. A communication system, characterized in that, Includes a terminal and a network device, where the terminal is configured to implement the communication method according to any one of claims 1-17, and the network device is configured to implement the communication method according to any one of claims 18-32.

42. A storage medium storing instructions, characterized in that, When the instructions run on the communication device, the communication device is caused to execute the communication method according to any one of claims 1-17 or claims 18-32.

Images