Channel state information feedback method and apparatus, and storage medium

Abstract

The present disclosure relates to a channel state information feedback method and apparatus, and a storage medium. The method comprises: sending first information, wherein the first information is used for indicating at least one of the following: a first spatial-domain basis vector of a horizontal dimension; and a second spatial-domain basis vector of a vertical dimension. By means of the solution of the present disclosure, the indication overhead of spatial-domain basis vectors is reduced.

Description

Channel state information feedback method, device and storage medium Technical Field

[0001] The present disclosure relates to the field of wireless communication technologies, and in particular to a channel state information feedback method, device, and storage medium. Background Art

[0002] With the development of wireless communication technology, the network side often deploys larger antennas or adds more antenna ports. In a multiple-input-multiple-output (MIMO) system, in order to improve signal transmission performance and system capacity, the network device needs to determine the optimal precoding vector based on the channel status information (CSI) fed back by the terminal, and then precode the downlink data. The terminal feeds back a precoding matrix indicator (PMI) to the network device through the CSI, so that the network device obtains the downlink precoding matrix. The PMI fed back by the terminal contains information indicating the spatial basis vector to indicate to the network device the spatial basis vector selected by the terminal.

[0003] Summary of the Invention

[0004] When the number of antenna ports is large, the indication overhead of the spatial basis vectors will increase significantly.

[0005] Embodiments of the present disclosure provide a channel state information feedback method, device, and storage medium.

[0006] According to a first aspect of an embodiment of the present disclosure, a channel state information feedback method is proposed, which is executed by a terminal. The method includes: sending first information, where the first information is used to indicate at least one of the following: a first spatial basis vector in the horizontal dimension; a second spatial basis vector in the vertical dimension.

[0007] According to a second aspect of an embodiment of the present disclosure, a channel state information feedback method is provided, performed by a network device. The method includes receiving first information, the first information being used to indicate at least one of the following: a first spatial basis vector in a horizontal dimension; and a second spatial basis vector in a vertical dimension.

[0008] According to a third aspect of an embodiment of the present disclosure, a channel state information feedback method is provided, performed by a communication device. The method includes: a terminal sending first information to a network device, the first information being used to indicate at least one of the following: a first spatial basis vector in a horizontal dimension; or a second spatial basis vector in a vertical dimension.

[0009] According to a fourth aspect of an embodiment of the present disclosure, a terminal is proposed, including: a transceiver module for sending first information, where the first information is used to indicate at least one of the following: a first spatial basis vector in the horizontal dimension; a second spatial basis vector in the vertical dimension.

[0010] According to a fifth aspect of an embodiment of the present disclosure, a network device is proposed, including: a transceiver module for receiving first information, the first information being used to indicate at least one of the following: a first spatial basis vector in a horizontal dimension; a second spatial basis vector in a vertical dimension.

[0011] According to a sixth aspect of an embodiment of the present disclosure, a communication device is provided. The communication device includes: one or more processors; and one or more memories for storing instructions; wherein the processor is configured to invoke the instructions so that the communication device executes the method according to any one of the first and second aspects.

[0012] According to a seventh aspect of an embodiment of the present disclosure, a communication system is proposed, including: a terminal and a network device; wherein the terminal is used to execute the method as described in the first aspect; and the network device is used to execute the method as described in the second aspect.

[0013] According to an eighth aspect of the embodiments of the present disclosure, a storage medium (which may also be described as a computer storage medium) is provided. The storage medium stores instructions. When the instructions are executed by a processor, the method described in the first aspect or the second aspect is performed.

[0014] According to a ninth aspect of the present disclosure, a computer program or computer program product is provided. The computer program or computer program product includes code. When the instructions are executed by a processor, the method according to the first or second aspect is performed.

[0015] The technical solution provided by the embodiments of the present disclosure reduces the indication overhead of spatial basis vectors.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and do not constitute limitations on the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] FIG1 is a schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure.

[0019] FIG2A is a schematic diagram of a first process of a CSI feedback method according to an embodiment of the present disclosure.

[0020] FIG2B is a schematic diagram of a second flow chart of a CSI feedback method according to an embodiment of the present disclosure.

[0021] FIG2C is a schematic diagram of a third flow chart of a CSI feedback method according to an embodiment of the present disclosure.

[0022] FIG2D is a schematic diagram of a fourth flow chart of a CSI feedback method according to an embodiment of the present disclosure.

[0023] FIG3A is a schematic diagram of a first process of performing a CSI feedback method on a terminal side according to an embodiment of the present disclosure.

[0024] FIG3B is a schematic diagram of a second process of performing a CSI feedback method on a terminal side according to an embodiment of the present disclosure.

[0025] FIG4A is a schematic diagram of a first flow chart of a method for performing CSI feedback on a network device side according to an embodiment of the present disclosure.

[0026] FIG4B is a schematic diagram of a second flow chart of a method for performing CSI feedback on a network device side according to an embodiment of the present disclosure.

[0027] FIG5A is a schematic diagram of a third flow chart of a method for performing CSI feedback on a terminal side according to an embodiment of the present disclosure.

[0028] FIG5B is a schematic diagram of a third flow chart of a method for performing CSI feedback on a network device side according to an embodiment of the present disclosure.

[0029] FIG6A is a schematic diagram of a fourth flow chart of a method for performing CSI feedback on a terminal side according to an embodiment of the present disclosure.

[0030] FIG6B is a fourth flow chart illustrating a method for performing CSI feedback on a network device side according to an embodiment of the present disclosure.

[0031] FIG7A is a schematic structural diagram of a terminal according to an embodiment of the present disclosure.

[0032] FIG7B is a schematic structural diagram of a network device according to an embodiment of the present disclosure.

[0033] FIG8A is a schematic structural diagram of a communication device according to an embodiment of the present disclosure.

[0034] FIG8B is a schematic structural diagram of a chip according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] Embodiments of the present disclosure provide a channel state information feedback method, device, and storage medium.

[0036] In a first aspect, embodiments of the present disclosure provide a channel state information feedback method, performed by a terminal, comprising: sending first information, the first information being used to indicate at least one of the following: a first spatial basis vector in a horizontal dimension; and a second spatial basis vector in a vertical dimension.

[0037] In an embodiment of the present disclosure, a terminal transmits first information to a network device to indicate at least one of its selected horizontal and vertical spatial basis vectors. Because the horizontal and vertical spatial basis vectors are indicated separately, fewer bits are used, thereby reducing the overhead of indicating the spatial basis vectors. Furthermore, when the terminal only feeds back the horizontal or vertical spatial basis vectors to the network device, the number of parameters fed back is reduced, further reducing the overhead of indicating the spatial basis vectors.

[0038] In combination with some embodiments of the first aspect, in some possible embodiments, the first spatial basis vector is indicated by a first field of the first information.

[0039] In combination with some embodiments of the first aspect, in some possible embodiments, the bit value of the first field is determined based on the number of antenna ports in the horizontal dimension and the number of first spatial basis vectors.

[0040] In combination with some embodiments of the first aspect, in some possible embodiments, the bit value of the first field is calculated according to expression (1).

[0041] In combination with some embodiments of the first aspect, in some possible embodiments, the second spatial basis vector is indicated by a second field of the first information.

[0042] In combination with some embodiments of the first aspect, in some possible embodiments, the bit value of the second field is determined based on the number of antenna ports in the vertical dimension and the number of second spatial basis vectors.

[0043] In combination with some embodiments of the first aspect, in some possible embodiments, the bit value of the second field is calculated according to expression (2).

[0044] In combination with some embodiments of the first aspect, in some possible embodiments, the above method also includes: sending second information, the second information being used to indicate at least one of the following: a first orthogonal spatial basis vector group in the horizontal dimension, and a second orthogonal spatial basis vector group in the vertical dimension.

[0045] In the disclosed embodiment, the terminal transmits second information to the network device to indicate at least one of the first orthogonal spatial basis vector group in the horizontal dimension and the second orthogonal spatial basis vector group in the vertical dimension selected by the terminal. Because the spatial basis vector group in the horizontal dimension and the spatial basis vector group in the vertical dimension are indicated separately, fewer bits can be used, thereby further reducing the indication overhead of the spatial basis vectors.

[0046] In combination with some embodiments of the first aspect, in some possible embodiments, the above method also includes: receiving third information, the third information is used to indicate the number of spatial basis vectors, and the number of spatial basis vectors is used to determine at least one of the first spatial basis vector and the second spatial basis vector.

[0047] In combination with some embodiments of the first aspect, in some possible embodiments, the number of spatial basis vectors includes at least one of the following: the number of spatial basis vectors in the horizontal dimension; the number of spatial basis vectors in the vertical dimension.

[0048] In an embodiment of the present disclosure, a network device configures at least one of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension for a terminal, so that the terminal can feedback at least one of the spatial basis vectors in the horizontal dimension and the spatial basis vectors in the vertical dimension based on the configured number of spatial basis vectors in the horizontal dimension and / or the number of spatial basis vectors in the vertical dimension. Since the spatial basis vectors in the horizontal dimension and the spatial basis vectors in the vertical dimension are indicated separately, fewer bits can be used, thereby reducing the indication overhead of the spatial basis vectors. In addition, the indication overhead of the spatial basis vectors can be further reduced by reducing the number of parameters fed back.

[0049] In combination with some embodiments of the first aspect, in some possible embodiments, the number of spatial basis vectors includes the total number of spatial basis vectors, wherein the total number of spatial basis vectors is equal to the product of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension.

[0050] In an embodiment of the present disclosure, the network device configures the total number of spatial basis vectors for the terminal respectively, and the total number of spatial basis vectors is equal to the product of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension, so that the terminal can determine and feed back at least one of the spatial basis vectors in the horizontal dimension and the spatial basis vectors in the vertical dimension according to the total number of spatial basis vectors, and can use fewer bits, thereby reducing the indication overhead of the spatial basis vector.

[0051] In combination with some embodiments of the first aspect, in some possible embodiments, the above method also includes: sending fourth information, where the fourth information is used to indicate at least one of the following: the number of first spatial basis vectors; the number of second spatial basis vectors.

[0052] In combination with some embodiments of the first aspect, in some possible embodiments, the number of first spatial basis vectors is indicated by the third field of the fourth information.

[0053] In combination with some embodiments of the first aspect, in some possible embodiments, the bit value of the third field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the horizontal dimension; a first preset value.

[0054] In combination with some embodiments of the first aspect, in some possible embodiments, the number of second spatial basis vectors is indicated by a fourth field of the fourth information.

[0055] In combination with some embodiments of the first aspect, in some possible embodiments, the bit value of the fourth field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the vertical dimension; a second preset value.

[0056] In combination with some embodiments of the first aspect, in some possible embodiments, the above method also includes: receiving fifth information, the fifth information including at least one of the following: the number of antenna ports in the horizontal dimension; the number of antenna ports in the vertical dimension; the oversampling factor in the horizontal dimension; the oversampling factor in the vertical dimension.

[0057] In a second aspect, embodiments of the present disclosure provide a channel state information feedback method, performed by a network device. The method comprises: receiving first information, the first information being used to indicate at least one of the following: a first spatial basis vector in a horizontal dimension; and a second spatial basis vector in a vertical dimension.

[0058] In combination with some embodiments of the second aspect, in some possible embodiments, the first spatial basis vector is indicated by a first field of the first information.

[0059] In combination with some embodiments of the second aspect, in some possible embodiments, the bit value of the first field is determined based on the number of antenna ports in the horizontal dimension and the number of first spatial basis vectors.

[0060] In combination with some embodiments of the second aspect, in some possible embodiments, the bit value of the first field is calculated according to expression (1).

[0061] In combination with some embodiments of the second aspect, in some possible embodiments, the second spatial basis vector is indicated by the second field of the first information.

[0062] In combination with some embodiments of the second aspect, in some possible embodiments, the bit value of the second field is determined based on the number of antenna ports in the vertical dimension and the number of second spatial basis vectors.

[0063] In combination with some embodiments of the second aspect, in some possible embodiments, the bit value of the second field is calculated according to expression (2).

[0064] In combination with some embodiments of the second aspect, in some possible embodiments, the above method also includes: receiving second information, the second information being used to indicate at least one of the following: a first orthogonal spatial basis vector group in the horizontal dimension; a second orthogonal spatial basis vector group in the vertical dimension.

[0065] In combination with some embodiments of the second aspect, in some possible embodiments, the above method also includes: sending third information, the third information is used to indicate the number of spatial basis vectors, and the number of spatial basis vectors is used to determine at least one of the first spatial basis vector and the second spatial basis vector.

[0066] In combination with some embodiments of the second aspect, in some possible embodiments, the number of spatial basis vectors includes at least one of the following: the number of spatial basis vectors in the horizontal dimension; the number of spatial basis vectors in the vertical dimension.

[0067] In combination with some embodiments of the second aspect, in some possible embodiments, the number of spatial basis vectors includes the total number of spatial basis vectors, wherein the total number of spatial basis vectors is equal to the product of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension.

[0068] In combination with some embodiments of the second aspect, in some possible embodiments, the above method also includes: receiving fourth information, the fourth information being used to indicate at least one of the following: the number of first spatial basis vectors; the number of second spatial basis vectors.

[0069] In combination with some embodiments of the second aspect, in some possible embodiments, the number of first spatial basis vectors is indicated by the third field of the fourth information.

[0070] In combination with some embodiments of the second aspect, in some possible embodiments, the bit value of the third field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the horizontal dimension; a first preset value.

[0071] In combination with some embodiments of the second aspect, in some possible embodiments, the number of second spatial basis vectors is indicated by a fourth field of the fourth information.

[0072] In combination with some embodiments of the second aspect, in some possible embodiments, the bit value of the fourth field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the vertical dimension; a second preset value.

[0073] In combination with some embodiments of the second aspect, in some possible embodiments, the above method also includes: sending fifth information, the fifth information including at least one of the following: the number of antenna ports in the horizontal dimension; the number of antenna ports in the vertical dimension; the oversampling factor in the horizontal dimension; the oversampling factor in the vertical dimension.

[0074] In a third aspect, embodiments of the present disclosure provide a channel state information feedback method, performed by a communication system. The method includes: a terminal sending first information to a network device, the first information indicating at least one of the following: a first spatial basis vector in the horizontal dimension; or a second spatial basis vector in the vertical dimension.

[0075] In combination with some embodiments of the third aspect, in some possible embodiments, the first spatial basis vector is indicated by a first field of the first information.

[0076] In combination with some embodiments of the third aspect, in some possible embodiments, the bit value of the first field is determined based on the number of antenna ports in the horizontal dimension and the number of first spatial basis vectors.

[0077] In combination with some embodiments of the third aspect, in some possible embodiments, the bit value of the first field is calculated according to expression (1).

[0078] In combination with some embodiments of the third aspect, in some possible embodiments, the second spatial basis vector is indicated by the second field of the first information.

[0079] In combination with some embodiments of the third aspect, in some possible embodiments, the bit value of the second field is determined based on the number of antenna ports in the vertical dimension and the number of second spatial basis vectors.

[0080] In combination with some embodiments of the third aspect, in some possible embodiments, the bit value of the second field is calculated according to expression (2).

[0081] In combination with some embodiments of the third aspect, in some possible embodiments, the above method also includes: the terminal sends second information to the network device, and the second information is used to indicate at least one of the following: a first orthogonal spatial basis vector group in the horizontal dimension; a second orthogonal spatial basis vector group in the vertical dimension.

[0082] In combination with some embodiments of the third aspect, in some possible embodiments, the above method also includes: the network device sends third information to the terminal, the third information is used to indicate the number of spatial basis vectors, and the number of spatial basis vectors is used to determine at least one of the first spatial basis vector and the second spatial basis vector.

[0083] In combination with some embodiments of the third aspect, in some possible embodiments, the number of spatial basis vectors includes at least one of the following: the number of spatial basis vectors in the horizontal dimension; the number of spatial basis vectors in the vertical dimension.

[0084] In combination with some embodiments of the third aspect, in some possible embodiments, the number of spatial basis vectors includes the total number of spatial basis vectors, wherein the total number of spatial basis vectors is equal to the product of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension.

[0085] In combination with some embodiments of the third aspect, in some possible embodiments, the above method also includes: the terminal sends fourth information to the network device, and the fourth information is used to indicate at least one of the following: the number of first spatial basis vectors; the number of second spatial basis vectors.

[0086] In combination with some embodiments of the third aspect, in some possible embodiments, the number of first spatial basis vectors is indicated by the third field of the fourth information.

[0087] In combination with some embodiments of the third aspect, in some possible embodiments, the bit value of the third field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the horizontal dimension; a first preset value.

[0088] In combination with some embodiments of the third aspect, in some possible embodiments, the number of second spatial basis vectors is indicated by a fourth field of the fourth information.

[0089] In combination with some embodiments of the third aspect, in some possible embodiments, the bit value of the fourth field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the vertical dimension; a second preset value.

[0090] In combination with some embodiments of the third aspect, in some possible embodiments, the above method also includes: receiving fifth information, the fifth information including at least one of the following: the number of antenna ports in the horizontal dimension; the number of antenna ports in the vertical dimension; the oversampling factor in the horizontal dimension; the oversampling factor in the vertical dimension.

[0091] In a fourth aspect, embodiments of the present disclosure provide a terminal comprising: a transceiver module configured to transmit first information, wherein the first information is configured to indicate at least one of the following: a first spatial basis vector in a horizontal dimension; and a second spatial basis vector in a vertical dimension.

[0092] In combination with some embodiments of the fourth aspect, in some possible embodiments, the first spatial basis vector is indicated by the first field of the first information.

[0093] In combination with some embodiments of the fourth aspect, in some possible embodiments, the bit value of the first field is determined based on the number of antenna ports in the horizontal dimension and the number of first spatial basis vectors.

[0094] In combination with some embodiments of the fourth aspect, in some possible embodiments, the bit value of the first field is calculated according to expression (1).

[0095] In combination with some embodiments of the fourth aspect, in some possible embodiments, the second spatial basis vector is indicated by the second field of the first information.

[0096] In combination with some embodiments of the fourth aspect, in some possible embodiments, the bit value of the second field is determined based on the number of antenna ports in the vertical dimension and the number of second spatial basis vectors.

[0097] In combination with some embodiments of the fourth aspect, in some possible embodiments, the bit value of the second field is calculated according to expression (2).

[0098] In combination with some embodiments of the fourth aspect, in some possible embodiments, the transceiver module is also used to send second information, and the second information is used to indicate at least one of the following: a first orthogonal spatial basis vector group in the horizontal dimension; a second orthogonal spatial basis vector group in the vertical dimension.

[0099] In combination with some embodiments of the fourth aspect, in some possible embodiments, the transceiver module is also used to receive third information, where the third information is used to indicate the number of spatial basis vectors, and the number of spatial basis vectors is used to determine at least one of the first spatial basis vector and the second spatial basis vector.

[0100] In combination with some embodiments of the fourth aspect, in some possible embodiments, the number of spatial basis vectors includes at least one of the following: the number of spatial basis vectors in the horizontal dimension; the number of spatial basis vectors in the vertical dimension.

[0101] In combination with some embodiments of the fourth aspect, in some possible embodiments, the number of spatial basis vectors includes the total number of spatial basis vectors, wherein the total number of spatial basis vectors is equal to the product of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension.

[0102] In combination with some embodiments of the fourth aspect, in some possible embodiments, the transceiver module is also used to send fourth information, and the fourth information is used to indicate at least one of the following: the number of first spatial basis vectors; the number of second spatial basis vectors.

[0103] In combination with some embodiments of the fourth aspect, in some possible embodiments, the number of first spatial basis vectors is indicated by the third field of the fourth information.

[0104] In combination with some embodiments of the fourth aspect, in some possible embodiments, the bit value of the third field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the horizontal dimension; a first preset value.

[0105] In combination with some embodiments of the fourth aspect, in some possible embodiments, the number of second spatial basis vectors is indicated by a fourth field of the fourth information.

[0106] In combination with some embodiments of the fourth aspect, in some possible embodiments, the bit value of the fourth field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the vertical dimension; a second preset value.

[0107] In combination with some embodiments of the fourth aspect, in some possible embodiments, the transceiver module is also used to receive fifth information, and the fifth information includes at least one of the following: the number of antenna ports in the horizontal dimension; the number of antenna ports in the vertical dimension; the oversampling factor in the horizontal dimension; and the oversampling factor in the vertical dimension.

[0108] In a fifth aspect, embodiments of the present disclosure provide a network device comprising: a transceiver module configured to receive first information, the first information being configured to indicate at least one of the following: a first spatial basis vector in a horizontal dimension; and a second spatial basis vector in a vertical dimension.

[0109] In combination with some embodiments of the fifth aspect, in some possible embodiments, the first spatial basis vector is indicated by the first field of the first information.

[0110] In combination with some embodiments of the fifth aspect, in some possible embodiments, the bit value of the first field is determined based on the number of antenna ports in the horizontal dimension and the number of first spatial basis vectors.

[0111] In combination with some embodiments of the fifth aspect, in some possible embodiments, the bit value of the first field is calculated according to expression (1).

[0112] In combination with some embodiments of the fifth aspect, in some possible embodiments, the second spatial basis vector is indicated by the second field of the first information.

[0113] In combination with some embodiments of the fifth aspect, in some possible embodiments, the bit value of the second field is determined based on the number of antenna ports in the vertical dimension and the number of second spatial basis vectors.

[0114] In combination with some embodiments of the fifth aspect, in some possible embodiments, the bit value of the second field is calculated according to expression (2).

[0115] In combination with some embodiments of the fifth aspect, in some possible embodiments, the transceiver module is also used to receive second information, and the second information is used to indicate at least one of the following: a first orthogonal spatial basis vector group in the horizontal dimension; a second orthogonal spatial basis vector group in the vertical dimension.

[0116] In combination with some embodiments of the fifth aspect, in some possible embodiments, the transceiver module is also used to send third information, where the third information is used to indicate the number of spatial basis vectors, and the number of spatial basis vectors is used to determine at least one of the first spatial basis vector and the second spatial basis vector.

[0117] In combination with some embodiments of the fifth aspect, in some possible embodiments, the number of spatial basis vectors includes at least one of the following: the number of spatial basis vectors in the horizontal dimension; the number of spatial basis vectors in the vertical dimension.

[0118] In combination with some embodiments of the fifth aspect, in some possible embodiments, the number of spatial basis vectors includes the total number of spatial basis vectors, wherein the total number of spatial basis vectors is equal to the product of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension.

[0119] In combination with some embodiments of the fifth aspect, in some possible embodiments, the transceiver module is also used to receive fourth information, and the fourth information is used to indicate at least one of the following: the number of first spatial basis vectors; the number of second spatial basis vectors.

[0120] In combination with some embodiments of the fifth aspect, in some possible embodiments, the number of first spatial basis vectors is indicated by the third field of the fourth information.

[0121] In combination with some embodiments of the fifth aspect, in some possible embodiments, the bit value of the third field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the horizontal dimension; a first preset value.

[0122] In combination with some embodiments of the fifth aspect, in some possible embodiments, the number of second spatial basis vectors is indicated by a fourth field of the fourth information.

[0123] In combination with some embodiments of the fifth aspect, in some possible embodiments, the bit value of the fourth field is determined by at least one of the following: the number of spatial basis vectors; the number of antenna ports in the vertical dimension; a second preset value.

[0124] In combination with some embodiments of the fifth aspect, in some possible embodiments, the transceiver module is also used to send fifth information, and the fifth information includes at least one of the following: the number of antenna ports in the horizontal dimension; the number of antenna ports in the vertical dimension; the oversampling factor in the horizontal dimension; and the oversampling factor in the vertical dimension.

[0125] In a sixth aspect, embodiments of the present disclosure provide a communication device. The communication device includes: one or more processors; and one or more memories for storing instructions; wherein the processor is configured to invoke the instructions so that the communication device executes the method of any one of the first aspect, the second aspect, and their embodiments.

[0126] In a seventh aspect, embodiments of the present disclosure provide a communication system comprising: a terminal and a network device, wherein the terminal is configured to execute the method described in any one of the first aspect and its embodiments, and the network device is configured to execute the method described in any one of the second aspect and its embodiments.

[0127] In an eighth aspect, an embodiment of the present disclosure provides a storage medium storing instructions that, when executed on a communication device, cause the communication device to execute the method of any one of the first aspect, the second aspect, and the embodiments thereof.

[0128] In the ninth aspect, an embodiment of the present disclosure proposes a computer program product. When the computer program product is executed by a communication device, the communication device executes a method as described in any one of the first aspect, the second aspect, and the embodiments thereof.

[0129] In a tenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a communication device, enables a computer to execute a method as described in any one of the first aspect, the second aspect, and their embodiments.

[0130] It is understandable that the above-mentioned terminals, network devices, communication devices, storage media, computer program products, and computer programs are all used to execute the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0131] The present disclosure provides a channel state information feedback method, apparatus, and storage medium. In some possible embodiments, the terms channel state information feedback method, channel state information reporting method, channel state information sending method, communication method, and information processing method may be used interchangeably. The terms terminal, network device, communication device, and information processing device may be used interchangeably. The terms communication system and information processing system may be used interchangeably.

[0132] 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. Unless there is any 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 implementations in a certain embodiment can be arbitrarily combined. In addition, the embodiments can be arbitrarily combined. For example, some or all of the steps of different embodiments can be arbitrarily combined. For another example, a certain embodiment can be arbitrarily combined with the optional implementations of other embodiments.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0137] In some possible embodiments, terms such as "at least one (at least one item, at least one, at least one of)", "one or more (one or more)", "a plurality of (a plurality of)", "multiple (multiple)" etc. can be used interchangeably.

[0138] In some possible 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 circumstances: in some possible embodiments, A (A is executed independently of B); in some possible embodiments, B (B is executed independently of A); in some possible embodiments, execution is selected from A and B (A and B are selectively executed); and in some possible 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.

[0139] In some possible embodiments, the "A or B" or other descriptions may include the following technical solutions depending on the situation: in some possible embodiments, A (A is executed independently of B); in some possible embodiments, B (B is executed independently of A); in some possible embodiments, execution is selected from A and B (A and B are selectively executed). The above is similar when there are more branches such as A, B, C, etc.

[0140] 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.

[0141] In some possible embodiments, “including A”, “containing A”, “used to indicate A”, and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0142] In some possible 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.

[0143] In some possible embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0144] In some possible 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.

[0145] In some possible embodiments, "network" may be interpreted as devices included in the network (eg, access network devices, core network devices, etc.).

[0146] In some possible 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”, “femtocell”, “picocell”, “sector”, “cell group”, “serving cell”, “carrier”, “component carrier”, “bandwidth part (BWP)” and the like may be used interchangeably.

[0147] In some possible embodiments, the terms “terminal”, “terminal device”, “user equipment (UE)”, “user terminal”, “mobile station (MS)”, “mobile terminal (MT)”, “subscriber station”, “mobile unit”, “subscriber unit”, “wireless unit”, “remote unit”, “mobile device”, “wireless device”, “wireless communication device”, “remote device”, “mobile subscriber station”, “access terminal”, “mobile terminal”, “wireless terminal”, “remote terminal”, “handset”, “user agent”, “mobile client”, “client” and the like may be used interchangeably.

[0148] In some possible 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 sidelinks. The sidelink can also be replaced by a sidelink.

[0149] In some possible 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.

[0150] In some possible embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0151] In some possible embodiments, data, information, etc. may be obtained after obtaining user consent.

[0152] 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.

[0153] FIG1 is a schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure.

[0154] As shown in Figure 1, a communication system 100 includes a terminal 101 and a network device 102. The network device 102 may be an access network device.

[0155] In some possible 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.

[0156] In some possible embodiments, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved node B (eNB), a next generation eNB (ng-eNB), a next generation node B (gNB), a node B (NB), a home node B (HNB), a home evolved node B (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0157] In some possible embodiments, the technical solutions of the present disclosure may be applicable to an open radio access network (Open RAN) architecture. In this case, the interfaces between access network devices or within access network devices involved in the embodiments of the present disclosure may become internal interfaces of Open RAN, and the processes and information interactions between these internal interfaces may be implemented through software or programs.

[0158] In some possible embodiments, the access network device may be composed of a centralized unit (CU) and a distributed unit (DU), where the CU may also be called a control unit. The CU-DU structure may be used to split the protocol layer of the access network device, with some functions of the protocol layer being centrally controlled by the CU, and the remaining part or all of the functions of the protocol layer being distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0159] 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.

[0160] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1 , or some of the entities in the communication system 100 , but are not limited thereto. The entities shown in FIG1 are illustrative only. The communication system 100 may include all or some of the entities shown in FIG1 , or may include other entities other than those shown in FIG1 . The number and form of the entities are arbitrary. 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.

[0161] The embodiments of the present disclosure may be applied to long term evolution (LTE), LTE-advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, international mobile telecommunications-advanced (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 802.17 (WiMAX (registered trademark)), IEEE 802.18 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (WiMAX (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (WiMAX (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (reg 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).

[0162] In the disclosed embodiments, the continuous emergence of new internet applications such as augmented reality (AR), virtual reality (VR), and vehicle-to-vehicle (V2V) communication has placed higher demands on wireless communication technology, driving the continuous evolution of wireless communication technology to meet these application needs. Currently, cellular mobile communication technology is in the process of evolving into a new generation of technology. A key feature of this new generation of technology is the flexible configuration that supports multiple service types. Different service types have different requirements for wireless communication technology. For example, enhanced mobile broadband (eMBB) service types primarily require high bandwidth and high speed; ultra-reliable low-latency communications (URLLC) service types primarily require high reliability and low latency; and massive machine type communications (mMTC) service types primarily require a large number of connections. Therefore, the next generation of wireless communication systems requires flexible and configurable designs to support the transmission of multiple service types.

[0163] With the development of wireless communication technology, the demand for improved frequency efficiency and enhanced coverage is becoming increasingly urgent. Consequently, MIMO technology has emerged. By deploying multiple transmit and receive antennas at the transmitter and receiver, respectively, signals are transmitted and received via multiple antennas at both ends, thereby improving communication quality. In a MIMO system, to improve signal transmission performance and system capacity, network equipment needs to determine the optimal precoding vector based on the channel status information (CSI) fed back by the terminal, and then precode the downlink data. The terminal feeds back the PMI to the network equipment via the CSI, allowing the network equipment to obtain the downlink precoding matrix.

[0164] It should be noted that the above-mentioned precoding matrix can also be described as a codebook.

[0165] In some possible embodiments, the CSI feedback based on the Type II codebook includes the PMI indication report, and the PMI also includes the indication information of the spatial basis vector (SD basis), which can be reported by Where N1 represents the number of antenna ports in the horizontal dimension, N2 represents the number of antenna ports in the vertical dimension, O1 represents the discrete Fourier transform (DFT) oversampling factor in the horizontal dimension, O2 represents the DFT oversampling factor in the vertical dimension, and L represents the total number of spatial basis vectors.

[0166] In some possible embodiments, the spatial basis vectors are derived from a DFT matrix. Each column vector in the DFT matrix can be referred to as a DFT vector. In other words, the spatial basis vectors can be DFT vectors. For example, the spatial basis vectors can be DFT vectors defined in the type II codebook in 3GPP protocol TS 38.214. Each spatial basis vector is calculated by using the Kronecker product of the DFT basis vectors in the horizontal dimension and the DFT basis vectors in the vertical dimension.

[0167] In some possible embodiments, the above-mentioned spatial basis vectors may be described as spatial beam basis vectors, may be described as beam basis vectors, or may be described as beams.

[0168] In some possible embodiments, the above-mentioned N1, N2, O1, O2 and L can be configured by a network device and indicated to the terminal through high-layer signaling. Exemplarily, the above-mentioned high-layer signaling may include: radio resource control (RRC) signaling, broadcast messages, system messages, medium access control (MAC) control elements (CE), downlink control information (DCI) or signaling carried by a physical downlink shared channel (PDSCH), etc.

[0169] For example, the values ​​of N1 and N2 can be configured through the high-layer signaling parameter n1-n2-codebookSubsetRestriction, and the values ​​of related O1 and O2 can be found in Table 5.2.2.2.1-2 in the 3GPP protocol TS 38.214 version.

[0170] Exemplarily, the value of L can be configured through the high-layer signaling parameter numberOfBeams.

[0171] In some possible embodiments, when the number of antenna ports in the MIMO system increases significantly, that is, the values ​​of N1 and N2 are large, if the To indicate the spatial basis vector, the indication overhead of the spatial basis vector will also increase significantly. For example, under the condition that the values ​​of O1 and O2 remain unchanged, assuming L = 4, N1 = 8, N2 = 2, When the values ​​of N1 and N2 become larger, N1 = 16, N2 = 4, that is, the number of antenna ports increases to 4 times the original number. It can be seen that the indication overhead of spatial basis vectors has nearly doubled.

[0172] In addition, when calculating the combination coefficients corresponding to the L spatial basis vectors, since it involves the N1N2-dimensional singular value decomposition (SVD) calculation, when the value of N1N2 is large, the terminal's computational complexity will also increase significantly.

[0173] It can be seen that the system overhead used in the processes of terminal feedback PMI and SVD calculation is positively correlated with the number of antenna ports N1N2 (which can also be understood as the dimension of information). Therefore, the larger N1N2 is, the more system overhead will increase.

[0174] In order to solve the above technical problems, the embodiments of the present disclosure provide a CSI feedback method, apparatus, and storage medium to reduce the indication overhead of spatial basis vectors.

[0175] FIG2A is a schematic diagram of a first flow chart of a CSI feedback method according to an embodiment of the present disclosure. The embodiment of the present disclosure relates to a CSI feedback method, which is used in a communication system 100. As shown in FIG2A , the CSI feedback method according to the embodiment of the present disclosure includes steps S2110 to S2140.

[0176] In step S2110 , the network device sends third information.

[0177] In some possible embodiments, the terminal receives third information.

[0178] In some possible embodiments, the third information is used to indicate the number of spatial basis vectors. The number of spatial basis vectors may include the number of spatial basis vectors in the horizontal dimension (denoted as L h ) and the number of spatial basis vectors in the vertical dimension (denoted as L v )

[0179] In some possible embodiments, the spatial basis vector fed back by the terminal is the spatial basis vector selected by the terminal, and the network device may not consider the spatial basis vector indicated by the terminal when determining the spatial basis vector. h and L vTo indicate at least one of the spatial basis vectors of the horizontal dimension and the spatial basis vectors of the vertical dimension of the terminal feedback. h , the terminal feeds back the spatial basis vector of the horizontal dimension; if the third information is used to indicate L v , the terminal feeds back the spatial basis vector of the vertical dimension; if the third information is used to indicate L h and L v , the terminal feeds back the spatial basis vectors of the horizontal dimension and the spatial basis vectors of the vertical dimension.

[0180] In some possible embodiments, the third information may be carried in a high-layer signaling and sent to the terminal. For example, the high-layer signaling may include RRC signaling, broadcast message, system message, MAC CE, DCI or signaling carried by PDSCH. h and L v The value of can be configured through the high-level signaling parameter numberOfBeams.

[0181] In step S2120, the network device sends fifth information.

[0182] In some possible embodiments, the terminal receives fifth information.

[0183] In some possible embodiments, the fifth information includes at least one of the number of antenna ports in the horizontal dimension (N1), the number of antenna ports in the vertical dimension (N2), the oversampling factor in the horizontal dimension (O1), and the oversampling factor in the vertical dimension (O2).

[0184] For example, the fifth information may include the values ​​of N1 and N2, so that the terminal can determine the corresponding O1 and O2 according to the protocol after receiving the fifth information. Alternatively, the fifth information may include N1, N2, O1, and O2.

[0185] In some embodiments, the network device may instruct the terminal to feedback at least one of the spatial basis vectors of the horizontal dimension and the spatial basis vectors of the vertical dimension by configuring at least one of the combination of N1 and O1 and the combination of N2 and O2 for the terminal. For example, if the fifth information is used to indicate N1 and O1, the terminal feedbacks the spatial basis vectors of the horizontal dimension; if the third information is used to indicate N2 and O2, the terminal feedbacks the spatial basis vectors of the vertical dimension; and if the third information is used to indicate N1, N2, O1, and O2, the terminal feedbacks the spatial basis vectors of the horizontal dimension and the spatial basis vectors of the vertical dimension.

[0186] In some possible embodiments, the fifth information may be carried in higher-layer signaling and sent to the terminal. Exemplarily, the higher-layer signaling may include RRC signaling, broadcast messages, system messages, MAC CE, DCI, or signaling carried by PDSCH. For example, the values ​​of N1 and N2 may be configured using the higher-layer signaling parameter n1-n2-codebookSubsetRestriction.

[0187] In some possible embodiments, the third information and the fifth information may be sent to the terminal together. For example, the third information and the fifth information may be carried in the same high-layer signaling or carried in different high-layer signaling and sent simultaneously.

[0188] In some possible embodiments, the third information and the fifth information may be sent to the terminal separately. For example, the third information and the fifth information may be carried in different high-layer signaling and sent in different time divisions.

[0189] In step S2130, the terminal sends the first information.

[0190] In some possible embodiments, the network device receives first information.

[0191] In some possible embodiments, the first information is used to indicate at least one of a first spatial basis vector in a horizontal dimension and a second spatial basis vector in a vertical dimension.

[0192] In some possible embodiments, the first information is used to indicate at least one of a first spatial basis vector and a second spatial basis vector, wherein the first spatial basis vector is a spatial basis vector of a horizontal dimension selected by the terminal, and the second spatial basis vector is a spatial basis vector of a vertical dimension selected by the terminal.

[0193] In some possible embodiments, the first information may include a first field, and the first spatial basis vector may be indicated by the first field.

[0194] In some possible embodiments, the first information may include a first field, and indication information of the first spatial basis vector is carried in the first field and sent to the network device.

[0195] In some possible embodiments, the bit value of the first field is based on N1 and L h Sure.

[0196] Exemplarily, the bit value of the first field can be calculated according to the following expression (1):

[0197] Therefore, the terminal passes Indicates the first spatial basis vector to the network device, that is, the L selected by the terminal from the candidate spatial basis vectors of N1 horizontal dimensions hSpatial basis vectors.

[0198] In some possible embodiments, the first information may include a second field, and the second spatial basis vector may be indicated by the second field.

[0199] In some possible embodiments, the first information may include a second field, and indication information of the second spatial basis vector is carried in the second field and sent to the network device.

[0200] In some possible embodiments, the bit value of the second field is based on N2 and L v Sure.

[0201] Exemplarily, the bit value of the second field can be calculated according to the following expression (2):

[0202] Therefore, the terminal passes Indicates the second spatial basis vector to the network device, that is, the L selected by the terminal from the candidate spatial basis vectors of N2 vertical dimensions v Spatial basis vectors.

[0203] In some possible embodiments, the first information may include a first field or a second field. In this case, the terminal indicates the first spatial basis vector or the second spatial basis vector to the network device.

[0204] In some possible embodiments, the first information may include a first field and a second field. In this case, the terminal indicates the first spatial basis vector and the second spatial basis vector to the network device.

[0205] In some possible embodiments, the first field and the second field may be different fields in the first information, or may be the same field in the first information.

[0206] In step S2140, the terminal sends the second information.

[0207] In some possible embodiments, the network device receives the second information.

[0208] In some possible embodiments, the second information is indication information of an oversampling factor.

[0209] In some possible embodiments, the second information is used to indicate an orthogonal spatial basis vector group (SD basis group), wherein the orthogonal spatial basis vector group may include at least one of a first orthogonal spatial basis vector group in a horizontal dimension and a second orthogonal spatial basis vector group in a vertical dimension.

[0210] In some possible embodiments, the second information is used to indicate at least one of a first orthogonal spatial basis vector group and a second orthogonal spatial basis vector group. The first orthogonal spatial basis vector group is an orthogonal spatial basis vector group in the horizontal dimension selected by the terminal. The second orthogonal spatial basis vector group is an orthogonal spatial basis vector group in the vertical dimension selected by the terminal.

[0211] In some possible embodiments, the second information may include a fifth field, and the first orthogonal spatial basis vector group may be indicated by the fifth field.

[0212] In some possible embodiments, the bit value of the fifth field is determined based on O1.

[0213] Exemplarily, the bit value of the fifth field can be calculated according to the following expression (3):

[0214] Therefore, the terminal passes A first orthogonal spatial basis vector group is indicated to the network device, where the first orthogonal spatial basis vector group may include N1 orthogonal spatial basis vectors.

[0215] In some possible embodiments, the second information may include a sixth field, and the second orthogonal spatial basis vector group may be indicated by the sixth field.

[0216] In some possible embodiments, the bit value of the sixth field is determined based on O2.

[0217] Exemplarily, the bit value of the sixth field can be calculated according to the following expression (4):

[0218] Therefore, the terminal passes A second orthogonal spatial basis vector group is indicated to the network device, where the second orthogonal spatial basis vector group may include N2 orthogonal spatial basis vectors.

[0219] In some possible embodiments, the second information may include a fifth field or a sixth field. In this case, the terminal indicates the first orthogonal spatial basis vector group or the second orthogonal spatial basis vector group to the network device.

[0220] In some possible embodiments, the first information may include a fifth field and a sixth field. In this case, the terminal indicates the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group to the network device.

[0221] In some possible embodiments, the fifth field and the sixth field may be different fields in the second information, or may be the same field in the second information.

[0222] In some possible embodiments, the terminal may indicate the spatial basis vectors and the orthogonal spatial basis vector group to the network device. In this case, the terminal may send the first information and the second information to the network device.

[0223] In some possible embodiments, CSI feedback can be divided into a first part (part 1) and a second part (part 2). Part 1 includes the rank of the codebook, a channel quality indication (CQI), and information indicating the number of non-zero coefficients of rank = v transmission layers or a wideband combination coefficient. Part 2 includes information indicating at least one of the spatial basis vectors, frequency basis vectors, and time basis vectors corresponding to rank = v, quantization information of the linear combination coefficients, and information indicating the position of the non-zero coefficients. The information length of part 2 is determined based on the indication content contained in part 1. In one embodiment, v = 1, 2, ..., P, P ∈ {1, 2, 4, 8}, and P is the number of ports in the CSI reference signal (CSI-RS) resource.

[0224] In some possible embodiments, the first information and the second information may be sent together to the network device. For example, the first information and the second information may be carried in the second part (part 2) of the CSI and sent.

[0225] In some possible embodiments, the terminal may send at least one of the first information and the second information to the network device according to its own needs. In one embodiment, when the terminal only feeds back the first information, the network device may independently determine at least one of the orthogonal spatial basis vector group of the horizontal dimension and the orthogonal spatial basis vector group of the vertical dimension without referring to the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group selected by the terminal. In one embodiment, when the terminal only feeds back the second information, the network device may independently determine at least one of the spatial basis vectors of the horizontal dimension and the intersection spatial basis vectors of the vertical dimension without referring to the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group selected by the terminal.

[0226] For example, the network device configures L for each terminal through the third information. h =2 and L v =2, and configure N1=8, N2=4, O1=4 and O2=4 for the terminal respectively through the fifth information.

[0227] Since N1=8、N2=4、L h =2 and L v =2, the terminal can send Instruction information to indicate the terminal to select 2 spatial basis vectors (i.e., the first spatial basis vectors) from the candidate spatial basis vectors of 8 horizontal dimensions. And the terminal can send Instruction information to instruct the terminal to select 2 spatial basis vectors (i.e., the second spatial basis vectors) from the candidate spatial basis vectors of the 4 vertical dimensions

[0228] Since O1=O2=4, the terminal can send Instruction information to indicate an orthogonal spatial basis vector group (i.e., the first orthogonal spatial basis vector) selected by the terminal containing 8 horizontal dimensions of the orthogonal spatial basis vectors. And the terminal can send to indicate the terminal to select an orthogonal spatial basis vector group (ie, the second orthogonal spatial basis vector) containing four vertical dimensions of orthogonal spatial basis vectors.

[0229] It can be seen that the total indication overhead of the terminal can be calculated according to expression (5):

[0230] It can be seen that if the terminal passes Feedback spatial basis vectors and orthogonal spatial basis vector groups, which indicate the overhead is Where L = L h L v =4. If the terminal passes Feedback the spatial basis vectors of the horizontal dimension, the spatial basis vectors of the vertical dimension, the orthogonal spatial basis vector group of the horizontal dimension, and the orthogonal spatial basis vector group of the vertical dimension respectively, and the indication overhead is Less than 22 bits, reducing the indication overhead of spatial basis vectors.

[0231] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S2110 to S2140. For example, steps S2110 and S2130 may be implemented as independent embodiments. For example, steps S2130 to S2140 may be implemented as independent embodiments. For example, steps S2110 to S2140 may be implemented as independent embodiments. It should be noted that one or more of steps S2110 to S2140 may constitute a possible independent embodiment, but are not limited to this.

[0232] In some possible embodiments, step S2120 and step S2140 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0233] In some possible embodiments, step S2110 and step S2120 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0234] In some possible embodiments, step S2140 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0235] In some embodiments, step S2110 and step S2120 may be executed in an exchanged order or simultaneously, and step S2130 and step S2140 may be executed in an exchanged order or simultaneously.

[0236] In the above embodiment, the terminal indicates at least one of the spatial basis vectors of the horizontal dimension and the spatial basis vectors of the vertical dimension selected by itself by sending the first information to the network device, thereby reducing the indication overhead of the spatial basis vectors.

[0237] In addition, in order to reduce the complexity of terminal processing, the terminal may also perform SVD calculations on the channel information of the horizontal dimension N1 and the channel information of the vertical dimension N2 respectively.

[0238] 2B is a second flow diagram of a CSI feedback method according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method, which is used in a communication system 100. As shown in FIG2B , the CSI feedback method according to this embodiment of the present disclosure includes steps S2210 to S2240.

[0239] In step S2210, the network device sends third information.

[0240] The optional implementation of step S2210 can refer to the optional implementation of step S2110 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0241] In some possible embodiments, the third information is used to indicate the number of spatial basis vectors. The number of spatial basis vectors may include L h and L v At least one of .

[0242] In step S2220, the network device sends fifth information.

[0243] The optional implementation of step S2220 can refer to the optional implementation of step S2120 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0244] In some possible embodiments, the fifth information includes at least one of N1, N2, O1, and O2.

[0245] In step S2230, the terminal sends the first information.

[0246] The optional implementation of step S2230 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0247] In some possible embodiments, the first information is used to indicate at least one of the first spatial basis vector and the second spatial basis vector.

[0248] In step S2240, the terminal sends the second information.

[0249] In some possible embodiments, the network device receives the second information.

[0250] In some possible embodiments, the second information is indication information of an oversampling factor.

[0251] In some possible embodiments, the second information is used to indicate an orthogonal spatial basis vector group (SD basis group).

[0252] In some possible embodiments, the second information may include a seventh field, and the orthogonal spatial basis vector group may be indicated by the seventh field.

[0253] In some possible embodiments, the bit value of the seventh field is determined based on O1 and O2.

[0254] Exemplarily, the bit value of the fifth field can be calculated according to the following expression (6):

[0255] Therefore, the terminal passes An orthogonal spatial basis vector group is indicated to a network device, where the orthogonal spatial basis vector group may include N1N2 orthogonal spatial basis vectors.

[0256] In some possible embodiments, the terminal may indicate the spatial basis vectors and the orthogonal spatial basis vector group to the network device. In this case, the terminal may send the first information and the second information to the network device.

[0257] In some possible embodiments, CSI feedback can be divided into a first part (part 1) and a second part (part 2). Part 1 includes the codebook rank, a channel quality indication (CQI), and information indicating the number of non-zero coefficients of rank = v transmission layers or wideband combination coefficients. Part 2 includes information indicating at least one of the spatial basis vectors, frequency basis vectors, and time basis vectors corresponding to rank = v, quantization information of the linear combination coefficients, and information indicating the positions of non-zero coefficients. The length of part 2 is determined based on the indication content included in part 1.

[0258] In some embodiments, the first information and the second information may be sent to the network device together. For example, the first information and the second information may be carried in the second part (part 2) of the CSI and sent.

[0259] In some possible embodiments, the terminal may send at least one of the first information and the second information to the network device based on its own needs. In one embodiment, when the terminal only feeds back the first information, the network device may independently determine a set of orthogonal spatial basis vectors without referencing the set of orthogonal spatial basis vectors selected by the terminal. In one embodiment, when the terminal only feeds back the second information, the network device may independently determine at least one of the spatial basis vectors for the horizontal dimension and the intersection spatial basis vectors for the vertical dimension without referencing the first spatial basis vectors and the second spatial basis vectors selected by the terminal.

[0260] For example, the network device configures L for each terminal through the third information. h =2 and L v =2, and configure N1=8, N2=4, O1=4 and O2=4 for the terminal respectively through the fifth information.

[0261] Since N1=8、N2=4、L h =2 and L v =2, the terminal can send Instruction information to indicate the terminal to select 2 spatial basis vectors (i.e., the first spatial basis vectors) from the candidate spatial basis vectors of 8 horizontal dimensions. And the terminal can send Instruction information to instruct the terminal to select 2 spatial basis vectors (i.e., the second spatial basis vectors) from the candidate spatial basis vectors of the 4 vertical dimensions

[0262] Since O1=O2=4, the terminal can send Instruction information to indicate an orthogonal spatial basis vector group (i.e., the first orthogonal spatial basis vector) selected by the terminal containing 8 horizontal dimensions of the orthogonal spatial basis vectors. And the terminal can send to indicate the terminal to select an orthogonal spatial basis vector group (ie, the second orthogonal spatial basis vector) containing four vertical dimensions of orthogonal spatial basis vectors.

[0263] It can be seen that the total indication overhead of the terminal can be calculated according to the following expression (7):

[0264] It can be seen that if the terminal passes Feedback spatial basis vectors and orthogonal spatial basis vector groups, which indicate the overhead is Where L = L h L v =4. If the terminal passes Feedback the spatial basis vectors of the horizontal dimension, the spatial basis vectors of the vertical dimension, and the orthogonal spatial basis vector group respectively, and the indication overhead is Less than 22 bits, reducing the indication overhead of spatial basis vectors.

[0265] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S2210 to S2240. For example, steps S2210 and S2230 may be implemented as independent embodiments. For example, steps S2230 to S2240 may be implemented as independent embodiments. For example, steps S2210 to S2240 may be implemented as independent embodiments. It should be noted that one or more of steps S2210 to S2240 may constitute a possible independent embodiment, but are not limited to this.

[0266] In some possible embodiments, step S2220 and step S2240 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0267] In some possible embodiments, step S2210 and step S2220 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0268] In some possible embodiments, step S2240 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0269] In some embodiments, step S2210 and step S2220 may be executed in an exchanged order or simultaneously, and step S2230 and step S2240 may be executed in an exchanged order or simultaneously.

[0270] In the above embodiment, the terminal indicates at least one of the spatial basis vectors of the horizontal dimension and the spatial basis vectors of the vertical dimension selected by itself by sending the first information to the network device, thereby reducing the indication overhead of the spatial basis vectors.

[0271] 2C is a third flow chart of a CSI feedback method according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method, which is used in a communication system 100. As shown in FIG2C , the CSI feedback method according to this embodiment of the present disclosure includes steps S2310 to S2350.

[0272] In step S2310, the network device sends third information.

[0273] In some possible embodiments, the terminal receives third information.

[0274] In some possible embodiments, the third information is used to indicate the total number of spatial basis vectors (ie, L). h With L v The product of L = L h ·L v .

[0275] In some possible embodiments, the third information may be carried in higher-layer signaling and sent to the terminal. For example, the higher-layer signaling may include RRC signaling, broadcast messages, system messages, MAC CE, DCI, or signaling carried by PDSCH. For example, the value of L may be configured using the higher-layer signaling parameter numberOfBeams.

[0276] In step S2320, the network device sends fifth information.

[0277] The optional implementation of step S2320 can refer to the optional implementation of step S2120 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0278] In some possible embodiments, the fifth information includes at least one of N1, N2, O1, and O2.

[0279] In step S2330, the terminal sends the first information.

[0280] The optional implementation of step S2330 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0281] In some possible embodiments, the first information is used to indicate at least one of the first spatial basis vector and the second spatial basis vector.

[0282] In step S2340, the terminal sends the second information.

[0283] The optional implementation of step S2340 can refer to the optional implementation of step S2140 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0284] In some possible embodiments, the second information is used to indicate at least one of the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group.

[0285] In step S2350, the terminal sends fourth information.

[0286] In some possible embodiments, the network device receives fourth information.

[0287] In some possible embodiments, the fourth information is used to indicate at least one of the number of the first spatial basis vectors and the number of the second spatial basis vectors. h , the number of the second spatial basis vectors is equal to L v .

[0288] In some possible embodiments, the fourth information includes a third field, and the number of the first spatial basis vectors is indicated by the third field.

[0289] In some possible embodiments, the fourth information includes a third field, and the number of the first spatial basis vectors is carried in the third field and sent to the network device.

[0290] In some possible embodiments, the bit value of the third field is determined based on N1 or L.

[0291] Exemplarily, the bit value of the third field can be calculated according to the following expression (8) or (9):

[0292] Therefore, the terminal passes or Indicate the number of first spatial basis vectors to the network device, such as L h .

[0293] In some possible embodiments, the bit value of the third field is a preset length. Exemplarily, the bit value of the third field may be a first preset value, such as a1bits.

[0294] In some possible embodiments, the first preset value may be determined based on N1.

[0295] In some possible embodiments, the fourth information includes a fourth field, and the number of the second spatial basis vectors is indicated by the fourth field.

[0296] In some possible embodiments, the fourth information includes a third field, and the number of the second spatial basis vectors is carried in the fourth field and sent to the network device.

[0297] In some possible embodiments, the bit value of the fourth field is determined based on N2 or L.

[0298] Exemplarily, the bit value of the fourth field can be calculated according to the following expression (8) or (10):

[0299] Therefore, the terminal passes or Indicate the number of the second spatial basis vectors to the network device, such as L v .

[0300] In some possible embodiments, the bit value of the fourth field is a preset length. Exemplarily, the bit value of the fourth field may be a second preset value, such as a2bits.

[0301] In some possible embodiments, the second preset value may be determined based on N2.

[0302] Exemplarily, the terminal may send the fourth information in the following manner, but is not limited to:

[0303] Method 1: Through Indicate L h and through Indicate L v .

[0304] Method 2: Through Indicate L h and through Indicate L v .

[0305] Method 3: Through Indicate L h and through Indicate L v .

[0306] Method 4: Through Indicate L h and through Indicate L v .

[0307] Method 5: Indicate L through a1bits h And L is indicated by a2bits v .

[0308] Of course, you can also The combination of a1bits and a2bits indicates L h and L v , the embodiments of the present disclosure do not make specific limitations on this.

[0309] In some possible embodiments, CSI feedback can be divided into a first part (part 1) and a second part (part 2). Part 1 includes the codebook rank, a channel quality indication (CQI), and information indicating the number of non-zero coefficients of rank = v transmission layers or wideband combination coefficients. Part 2 includes information indicating at least one of the spatial basis vectors, frequency basis vectors, and time basis vectors corresponding to rank = v, quantization information of the linear combination coefficients, and information indicating the positions of non-zero coefficients. The length of part 2 is determined based on the indication content included in part 1.

[0310] In some embodiments, the first information and the second information may be sent to the network device together. For example, the first information and the second information may be carried in the second part (part 2) of the CSI and sent.

[0311] In some embodiments, the fourth information can be sent to the network device together with the first information and the second information. For example, the first information and the second information can be carried in the second part (part2) of the CSI and sent, and the first information and the second information can be carried in the first part (part1) of the CSI and sent.

[0312] In some possible embodiments, the terminal may send at least one of the first information, the second information, and the fourth information to the network device according to its own needs. In one embodiment, when the terminal only feeds back the first information, the network device may independently determine at least one of the orthogonal spatial basis vector group of the horizontal dimension and the orthogonal spatial basis vector group of the vertical dimension without referring to the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group selected by the terminal. In one embodiment, when the terminal only feeds back the second information, the network device may independently determine at least one of the spatial basis vectors of the horizontal dimension and the intersection spatial basis vectors of the vertical dimension without referring to the first spatial basis vector and the second spatial basis vector selected by the terminal. In one embodiment, when the terminal only feeds back the fourth information, the network device may independently determine at least one of the number of spatial basis vectors of the horizontal dimension and the number of intersection spatial basis vectors of the vertical dimension without referring to the number of the first spatial basis vector and the second spatial basis vector selected by the terminal.

[0313] Exemplarily, for example, the network device configures L=4 for each terminal through the third information, and configures N1=8, N2=4, O1=4, and O2=4 for each terminal through the fifth information.

[0314] Since N1=8, N2=4, L=4, at this time, the terminal can use any one of the above methods 1 to 5 to indicate L h and L v Among them, if method 1 is adopted, L h and L v The instruction cost is If method 2 is adopted, L h and L v The instruction cost is If method 3 is adopted, L h and L v The instruction cost is If method 4 is adopted, L h and L v The instruction cost is If method 5 is adopted, L h and L v The indication overhead is a1+a2=3+2=5 bits.

[0315] If the terminal selects L according to the channel condition estimated by CSI-RS h =2 and L v =2, the terminal can send bits of indication information to indicate the 2 spatial basis vectors (i.e., the first spatial basis vectors) selected by the terminal from the candidate spatial basis vectors of the 8 horizontal dimensions. And the terminal can send to indicate the two spatial basis vectors (i.e., the second spatial basis vectors) selected by the terminal from the candidate spatial basis vectors in the four vertical dimensions.

[0316] Since O1=O2=4, the terminal can send Instruction information to indicate an orthogonal spatial basis vector group (i.e., the first orthogonal spatial basis vector) selected by the terminal containing 8 horizontal dimensions of the orthogonal spatial basis vectors. And the terminal can send to indicate the terminal to select an orthogonal spatial basis vector group (ie, the second orthogonal spatial basis vector) containing four vertical dimensions of orthogonal spatial basis vectors.

[0317] From this we can see that if method 1 or method 3 is used to indicate L h and L v , L h and L v The indication overhead is 4 bits, so the total indication overhead of the terminal can be calculated according to the following expression (11):

[0318] If you use method 2, method 4 or method 5 to indicate L h and L v , L h and L v The indication overhead is 5 bits, so the total indication overhead of the terminal can be calculated according to the following expression (12):

[0319] It can be seen that if the terminal passes Feedback spatial basis vectors and orthogonal spatial basis vector groups, which indicate the overhead is Where L = L h L v =4. If the terminal passes or Feedback the spatial basis vector of the horizontal dimension, the spatial basis vector of the vertical dimension, the orthogonal spatial basis vector group of the horizontal dimension, the orthogonal spatial basis vector group of the vertical dimension, L h and L v , which indicates the overhead is or Both are less than 22 bits, reducing the indication overhead of spatial basis vectors.

[0320] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S2310 to S2350. For example, steps S2310 and S2330 may be implemented as independent embodiments. For example, steps S2330 to S2340 may be implemented as independent embodiments. For example, steps S2330 to S2350 may be implemented as independent embodiments. For example, steps S2310 to S2340 may be implemented as independent embodiments. For example, steps S2310 to S2350 may be implemented as independent embodiments. It should be noted that one or more steps in steps S2310 to S2350 may constitute a possible independent embodiment, but are not limited thereto.

[0321] In some possible embodiments, step S2320, step S2340, and step S2350 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0322] In some possible embodiments, step S2310, step S2320, and step S2350 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0323] In some possible embodiments, step S2320 and step S2340 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0324] In some possible embodiments, step S2310 and step S2320 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0325] In some possible embodiments, step S2340 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0326] In some possible embodiments, step S2350 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0327] In some embodiments, step S2310 and step S2320 may be executed in an exchanged order or simultaneously, and step S2330, step S2340 and step S2350 may be executed in an exchanged order or simultaneously.

[0328] In the above embodiment, the terminal indicates at least one of the spatial basis vectors of the horizontal dimension and the spatial basis vectors of the vertical dimension selected by itself by sending the first information to the network device, thereby reducing the indication overhead of the spatial basis vectors.

[0329] 2D is a fourth flow chart illustrating a CSI feedback method according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method, which is used in a communication system 100. As shown in FIG2D , the CSI feedback method according to this embodiment of the present disclosure includes steps S2410 to S2450.

[0330] In step S2410, the network device sends third information.

[0331] The optional implementation of step S2410 can refer to the optional implementation of step S2310 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0332] In some possible embodiments, the third information is used to indicate the total number of spatial basis vectors (ie, L). h With L v The product of L = L h ·L v .

[0333] In step S2420, the network device sends fifth information.

[0334] The optional implementation of step S2420 can refer to the optional implementation of step S2120 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0335] In some possible embodiments, the fifth information includes at least one of N1, N2, O1, and O2.

[0336] In step S2430, the terminal sends the first information.

[0337] The optional implementation of step S2430 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0338] In some possible embodiments, the first information is used to indicate at least one of the first spatial basis vector and the second spatial basis vector.

[0339] In step S2440, the terminal sends the second information.

[0340] The optional implementation of step S2440 can refer to the optional implementation of step S2240 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0341] In some possible embodiments, the second information is used to indicate an orthogonal spatial basis vector group (SD basis group).

[0342] In step S2450, the terminal sends fourth information.

[0343] The optional implementation of step S2450 can refer to the optional implementation of step S2350 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0344] In some possible embodiments, the fourth information is used to indicate at least one of the number of the first spatial basis vectors and the number of the second spatial basis vectors. h , the number of the second spatial basis vectors is equal to L v .

[0345] In some possible embodiments, the terminal may send at least one of the first information, the second information, and the fourth information to the network device according to its own needs. In one embodiment, when the terminal only feeds back the first information, the network device may determine the orthogonal spatial basis vector group by itself without referring to the orthogonal spatial basis vector group selected by the terminal. In one embodiment, when the terminal only feeds back the second information, the network device may determine at least one of the spatial basis vectors of the horizontal dimension and the intersection spatial basis vectors of the vertical dimension by itself without referring to the first spatial basis vector and the second spatial basis vector selected by the terminal. In one embodiment, when the terminal only feeds back the fourth information, the network device may determine at least one of the number of spatial basis vectors of the horizontal dimension and the number of intersection spatial basis vectors of the vertical dimension by itself without referring to the number of the first spatial basis vector and the second spatial basis vector selected by the terminal.

[0346] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S2410 to S2450. For example, steps S2310 and S2430 may be implemented as independent embodiments. For example, steps S2430 to S2440 may be implemented as independent embodiments. For example, steps S2430 to S2450 may be implemented as independent embodiments. For example, steps S2410 to S2440 may be implemented as independent embodiments. For example, steps S2410 to S2450 may be implemented as independent embodiments. It should be noted that one or more steps in steps S2410 to S2450 may constitute a possible independent embodiment, but are not limited thereto.

[0347] In some possible embodiments, step S2420, step S2440, and step S2450 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0348] In some possible embodiments, step S2410, step S2420, and step S2450 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0349] In some possible embodiments, step S2420 and step S2440 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0350] In some possible embodiments, step S2410 and step S2420 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0351] In some possible embodiments, step S2440 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0352] In some possible embodiments, step S2450 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0353] In some embodiments, step S2410 and step S2420 may be executed in an exchanged order or simultaneously, and step S2430, step S2440 and step S2450 may be executed in an exchanged order or simultaneously.

[0354] In the above embodiment, the terminal indicates at least one of the spatial basis vectors of the horizontal dimension and the spatial basis vectors of the vertical dimension selected by itself by sending the first information to the network device, thereby reducing the indication overhead of the spatial basis vectors.

[0355] 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.

[0356] 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.

[0357] In some embodiments, terms such as "uplink", "uplink", "physical uplink" can be interchangeable with each other, and terms such as "downlink", "downlink", "physical downlink" can be interchangeable with each other, and terms such as "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" can be interchangeable with each other.

[0358] 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.

[0359] 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.

[0360] In some embodiments, the terms "radio", "wireless", "radio access network (RAN)", "access network (AN)", "RAN-based" and the like may be used interchangeably.

[0361] In some embodiments, terms such as "synchronization signal (SS)", "synchronization signal block (SSB)", "reference signal (RS)", "pilot", and "pilot signal" can be used interchangeably.

[0362] In some embodiments, terms such as wireless access scheme and waveform may be used interchangeably.

[0363] In some embodiments, the terms "precoding", "precoder", "weight", "precoding weight", "quasi-co-location (QCL)", "transmission configuration indication (TCI) state", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "the number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angular degree", "antenna", "antenna element", "panel" and the like can be used interchangeably.

[0364] 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.

[0365] 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.

[0366] In some embodiments, terms such as "send", "transmit", "report", "feedback", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0367] 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.

[0368] FIG3A is a schematic diagram illustrating a first process flow of a method for performing CSI feedback on a terminal side according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method for terminal 101 in communication system 100. As shown in FIG3A , the CSI feedback method of this embodiment of the present disclosure includes steps S3110 to S3140.

[0369] In step S3110, third information is received.

[0370] The optional implementation of step S3110 can refer to the optional implementation of step S2110 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0371] In some possible embodiments, the terminal 101 receives the third information sent by the network device 102, but is not limited thereto. The terminal 101 may also receive the third information sent by other entities.

[0372] In some possible embodiments, the third information is configured by the network device 102 through high-layer signaling.

[0373] In some possible embodiments, the third information is used to indicate the number of spatial basis vectors to the terminal 101, wherein the number of spatial basis vectors includes at least one of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension.

[0374] In step S3120, the fifth information is received.

[0375] The optional implementation of step S3120 can refer to the optional implementation of step S2120 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0376] In some possible embodiments, the terminal 101 receives the fifth information sent by the network device 102, but is not limited thereto. The terminal 101 may also receive the fifth information sent by other entities.

[0377] In some possible embodiments, the fifth information is configured by the network device 102 through high-layer signaling.

[0378] In step S3130, the first information is sent.

[0379] The optional implementation of step S3130 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0380] In some possible embodiments, the terminal 101 sends the first information to the network device 102, but is not limited thereto. The first information may also be sent to other entities.

[0381] In some possible embodiments, the first information is used to indicate to the network device 102 at least one of the first spatial basis vector and the second spatial basis vector selected by the terminal 101 .

[0382] In step S3140, the second information is sent.

[0383] The optional implementation of step S3140 can refer to the optional implementation of step S2140 in Figure 2A, the optional implementation of step S2240 in Figure 2B and other related parts in the embodiments involved in Figures 2A and 2B, which will not be repeated here.

[0384] In some possible embodiments, the terminal 101 sends the second information to the network device 102, but is not limited thereto. The second information may also be sent to other entities.

[0385] In some possible embodiments, the second information is used to indicate to the network device 102 at least one of the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group selected by the terminal 101 .

[0386] In some possible embodiments, the second information is used to indicate to the network device 102 the group of orthogonal spatial basis vectors selected by the terminal 101 .

[0387] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S3110 to S3140. For example, steps S3110 and S3130 may be implemented as independent embodiments. For example, steps S3130 to S3140 may be implemented as independent embodiments. For example, steps S3110 to S3140 may be implemented as independent embodiments. It should be noted that one or more of steps S3110 to S3140 may constitute a possible independent embodiment, but are not limited to this.

[0388] In some possible embodiments, step S3120 and step S3140 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0389] In some possible embodiments, step S3110 and step S3120 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0390] In some possible embodiments, step S3140 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0391] In some embodiments, step S3110 and step S3120 may be executed in an exchanged order or simultaneously, and step S3130 and step S3140 may be executed in an exchanged order or simultaneously.

[0392] 3B is a schematic diagram of a second flow chart of a CSI feedback method performed by a terminal side according to an embodiment of the present disclosure. The present disclosure embodiment relates to a CSI feedback method, which is used in a communication system 100. As shown in FIG3B , the CSI feedback method of the present disclosure embodiment includes steps S3210 to S3250.

[0393] In step S3210, third information is received.

[0394] The optional implementation of step S3210 can refer to the optional implementation of step S2310 in Figure 2C and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0395] In some possible embodiments, the terminal 101 receives the third information sent by the network device 102, but is not limited thereto. The terminal 101 may also receive the third information sent by other entities.

[0396] In some possible embodiments, the third information is configured by the network device 102 through high-layer signaling.

[0397] In step S3220, the fifth information is received.

[0398] The optional implementation of step S3220 can refer to the optional implementation of step S2120 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0399] In some possible embodiments, the terminal 101 receives the fifth information sent by the network device 102, but is not limited thereto. The terminal 101 may also receive the fifth information sent by other entities.

[0400] In some possible embodiments, the fifth information is configured by the network device 102 through high-layer signaling.

[0401] In step S3230, the first information is sent.

[0402] The optional implementation of step S3230 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0403] In some possible embodiments, the first information is used to indicate to the network device 102 at least one of the first spatial basis vector and the second spatial basis vector selected by the terminal 101 .

[0404] In step S3240, the second information is sent.

[0405] The optional implementation of step S3240 can refer to the optional implementation of step S2140 in Figure 2A, the optional implementation of step S2240 in Figure 2B, and other related parts in the embodiments involved in Figures 2A and 2B, which will not be repeated here.

[0406] In some possible embodiments, the second information is used to indicate to the network device 102 at least one of the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group selected by the terminal 101 .

[0407] In some possible embodiments, the second information is used to indicate to the network device 102 the group of orthogonal spatial basis vectors selected by the terminal 101 .

[0408] In step S3250, the fourth information is sent.

[0409] The optional implementation of step S3350 can refer to the optional implementation of step S2350 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0410] In some possible embodiments, the fourth information is used to indicate at least one of the number of the first spatial basis vectors and the number of the second spatial basis vectors. h , the number of the second spatial basis vectors is equal to L v .

[0411] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S3210 to S3250. For example, steps S3210 and S3230 may be implemented as independent embodiments. For example, steps S3230 to S3240 may be implemented as independent embodiments. For example, steps S3230 to S3250 may be implemented as independent embodiments. For example, steps S3210 to S3240 may be implemented as independent embodiments. For example, steps S3210 to S3250 may be implemented as independent embodiments. It should be noted that one or more steps in steps S3210 to S3250 may constitute a possible independent embodiment, but are not limited thereto.

[0412] In some possible embodiments, step S3220, step S3240, and step S3250 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0413] In some possible embodiments, step S3210, step S3220, and step S3250 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0414] In some possible embodiments, step S3220 and step S3240 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0415] In some possible embodiments, step S3210 and step S3220 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0416] In some possible embodiments, step S3240 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0417] In some possible embodiments, step S3250 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0418] In some embodiments, step S3210 and step S3220 may be executed in an exchanged order or simultaneously, and step S3230, step S3240 and step S3250 may be executed in an exchanged order or simultaneously.

[0419] FIG4A is a schematic diagram illustrating a first flow chart of a method for performing CSI feedback on a network device according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method for use with a network device 102 in a communication system 100. As shown in FIG4A , the CSI feedback method of this embodiment of the present disclosure includes steps S4110 to S4140.

[0420] In step S4110, the third information is sent.

[0421] The optional implementation of step S4110 can refer to the optional implementation of step S2110 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0422] In some possible embodiments, the network device 102 sends the third information to the terminal 101, but is not limited thereto and may also send the third information to other entities.

[0423] In some possible embodiments, the third information is configured by the network device 102 through high-layer signaling.

[0424] In some possible embodiments, the third information is used to indicate the number of spatial basis vectors to the terminal 101, wherein the number of spatial basis vectors includes at least one of the number of spatial basis vectors in the horizontal dimension and the number of spatial basis vectors in the vertical dimension.

[0425] In step S4120, the fifth information is sent.

[0426] The optional implementation of step S4120 can refer to the optional implementation of step S2120 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0427] In some possible embodiments, the network device 102 sends the fifth information to the terminal 101, but is not limited thereto and may also send the fifth information to other entities.

[0428] In some possible embodiments, the fifth information is configured by the network device 102 through high-layer signaling.

[0429] In step S4130, first information is received.

[0430] The optional implementation of step S4130 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0431] In some possible embodiments, the network device 102 receives the first information sent by the terminal 101, but is not limited thereto and may also receive the first information sent by other entities.

[0432] In some possible embodiments, the first information is used to indicate at least one of the first spatial basis vector and the second spatial basis vector selected by the terminal 101 .

[0433] In step S4140, second information is received.

[0434] The optional implementation of step S4140 can refer to the optional implementation of step S2140 in Figure 2A, the optional implementation of step S2240 in Figure 2B and other related parts in the embodiments involved in Figures 2A and 2B, which will not be repeated here.

[0435] In some possible embodiments, the network device 102 receives the second information sent by the terminal 101, but is not limited thereto and may also receive the second information sent by other entities.

[0436] In some possible embodiments, the second information is used to indicate to the network device 102 at least one of the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group selected by the terminal 101 .

[0437] In some possible embodiments, the second information is used to indicate to the network device 102 the group of orthogonal spatial basis vectors selected by the terminal 101 .

[0438] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S4110 to S4140. For example, steps S4110 and S4130 may be implemented as independent embodiments. For example, steps S4130 to S4140 may be implemented as independent embodiments. For example, steps S4110 to S4140 may be implemented as independent embodiments. It should be noted that one or more of steps S4110 to S4140 may constitute a possible independent embodiment, but are not limited to this.

[0439] In some possible embodiments, step S4120 and step S4140 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0440] In some possible embodiments, step S4110 and step S4120 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0441] In some possible embodiments, step S4140 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0442] In some embodiments, step S4110 and step S4120 may be executed in an exchanged order or simultaneously, and step S4130 and step S4140 may be executed in an exchanged order or simultaneously.

[0443] FIG4B is a schematic diagram illustrating a second flow chart of a CSI feedback method performed by a network device according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method for use with network device 102 in communication system 100. As shown in FIG4B , the CSI feedback method of this embodiment of the present disclosure includes steps S4210 to S4250.

[0444] In step S4210, the third information is sent.

[0445] The optional implementation of step S4210 can refer to the optional implementation of step S2310 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0446] In some possible embodiments, the network device 102 sends the third information to the terminal 101, but is not limited thereto and may also send the third information to other entities.

[0447] In some possible embodiments, the third information is configured by the network device 102 through high-layer signaling.

[0448] In some possible embodiments, the third information is used to indicate the number of spatial basis vectors to the terminal 101, where the number of spatial basis vectors includes the total number of spatial basis vectors.

[0449] In step S4220, the fifth information is sent.

[0450] The optional implementation of step S4220 can refer to the optional implementation of step S2120 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0451] In some possible embodiments, the network device 102 sends the fifth information to the terminal 101, but is not limited thereto and may also send the fifth information to other entities.

[0452] In some possible embodiments, the fifth information is configured by the network device 102 through high-layer signaling.

[0453] In step S4230, first information is received.

[0454] The optional implementation of step S4230 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0455] In some possible embodiments, the network device 102 receives the first information sent by the terminal 101, but is not limited thereto and may also receive the first information sent by other entities.

[0456] In some possible embodiments, the first information is used to indicate at least one of the first spatial basis vector and the second spatial basis vector selected by the terminal 101 .

[0457] In step S4240, second information is received.

[0458] The optional implementation of step S4240 can refer to the optional implementation of step S2140 in Figure 2A, the optional implementation of step S2240 in Figure 2B, and other related parts in the embodiments involved in Figures 2A and 2B, which will not be repeated here.

[0459] In some possible embodiments, the network device 102 receives the second information sent by the terminal 101, but is not limited thereto and may also receive the second information sent by other entities.

[0460] In some possible embodiments, the second information is used to indicate to the network device 102 at least one of the first orthogonal spatial basis vector group and the second orthogonal spatial basis vector group selected by the terminal 101 .

[0461] In some possible embodiments, the second information is used to indicate to the network device 102 the group of orthogonal spatial basis vectors selected by the terminal 101 .

[0462] In step S4250, the fourth information is received.

[0463] The optional implementation of step S4250 can refer to the optional implementation of step S2350 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0464] In some possible embodiments, the fourth information is used to indicate at least one of the number of the first spatial basis vectors and the number of the second spatial basis vectors. h , the number of the second spatial basis vectors is equal to L v .

[0465] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S4210 to S4250. For example, steps S4210 and S4230 may be implemented as independent embodiments. For example, steps S4230 to S4240 may be implemented as independent embodiments. For example, steps S4230 to S4250 may be implemented as independent embodiments. For example, steps S4210 to S4240 may be implemented as independent embodiments. For example, steps S4210 to S4250 may be implemented as independent embodiments. It should be noted that one or more steps in steps S4210 to S4250 may constitute a possible independent embodiment, but are not limited thereto.

[0466] In some possible embodiments, step S4220, step S4240, and step S4250 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0467] In some possible embodiments, step S4210, step S4220, and step S4250 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0468] In some possible embodiments, step S4220 and step S4240 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0469] In some possible embodiments, step S4210 and step S4220 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0470] In some possible embodiments, step S4240 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0471] In some possible embodiments, step S4250 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0472] In some embodiments, step S4210 and step S4220 may be executed in an exchanged order or simultaneously, and step S4230, step S4240 and step S4250 may be executed in an exchanged order or simultaneously.

[0473] Figure 5A is a schematic diagram of a third process flow of a method for CSI feedback performed by a terminal according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method for terminal 101 in communication system 100. As shown in Figure 5A, the CSI feedback method of this embodiment of the present disclosure includes steps S5110 to S5120.

[0474] In step S5110, third information is received.

[0475] The optional implementation of step S5110 can refer to the optional implementation of step S2110 in Figure 2A, the optional implementation of step S2310 in Figure 2C and other related parts in the embodiments involved in Figures 2A and 2C, which will not be repeated here.

[0476] In some possible embodiments, the terminal 101 receives the third information sent by the network device 102, but is not limited thereto. The terminal 101 may also receive the third information sent by other entities.

[0477] In some possible embodiments, the third information is configured by the network device 102 through high-layer signaling.

[0478] In some possible embodiments, the third information is used to indicate the number of spatial basis vectors to the terminal 101 .

[0479] In step S5120, the first information is sent.

[0480] The optional implementation of step S5120 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0481] In some possible embodiments, the terminal 101 sends the first information to the network device 102, but is not limited thereto. The first information may also be sent to other entities.

[0482] In some possible embodiments, the first information is used to indicate to the network device 102 at least one of the first spatial basis vector and the second spatial basis vector selected by the terminal 101 .

[0483] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S5110 to S5120. For example, step S5120 may be implemented as an independent embodiment. For example, steps S5110 to S5120 may be implemented as independent embodiments. It should be noted that one or more of steps S5110 to S5120 may constitute a possible independent embodiment, but are not limited thereto.

[0484] In some possible embodiments, step S5110 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0485] FIG5B is a schematic diagram illustrating a third flow chart of a method for CSI feedback performed by a network device according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method for use with network device 102 in communication system 100. As shown in FIG5B , the CSI feedback method of this embodiment of the present disclosure includes steps S5210 to S5220.

[0486] In step S5210, the third information is sent.

[0487] The optional implementation of step S5210 can refer to the optional implementation of step S2110 in Figure 2A, the optional implementation of step S2310 in Figure 2C, and other related parts in the embodiments involved in Figures 2A and 2C, which will not be repeated here.

[0488] In some possible embodiments, the network device 102 sends the third information to the terminal 101, but is not limited thereto and may also send the third information to other entities.

[0489] In some possible embodiments, the third information is configured by the network device 102 through high-layer signaling.

[0490] In some possible embodiments, the third information is used to indicate the number of spatial basis vectors to the terminal 101 .

[0491] In step S5220, first information is received.

[0492] The optional implementation of step S5220 can refer to the optional implementation of step S2130 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0493] In some possible embodiments, the network device 102 receives the first information sent by the terminal 101, but is not limited thereto and may also receive the first information sent by other entities.

[0494] In some possible embodiments, the first information is used to indicate at least one of the first spatial basis vector and the second spatial basis vector selected by the terminal 101 .

[0495] The CSI feedback method involved in the embodiments of the present disclosure may include at least one of steps S5210 to S5220. For example, step S5220 may be implemented as an independent embodiment. For example, steps S5210 to S5220 may be implemented as independent embodiments. It should be noted that one or more of steps S5210 to S5220 may constitute a possible independent embodiment, but are not limited thereto.

[0496] In some possible embodiments, step S5210 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0497] 6A is a fourth flow diagram illustrating a method for CSI feedback performed by a terminal side according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method, which is used by a terminal 101 in a communication system 100. As shown in FIG6A , the CSI feedback method of this embodiment of the present disclosure includes step S6110.

[0498] In step S6110, the first information is sent.

[0499] Optional implementations of step S6110 may refer to step S2130 of FIG. 2A and other related parts of the embodiment involved in FIG. 2A , which will not be described in detail here.

[0500] In some possible embodiments, the above method may include the methods described in the above embodiments on the communication system side and the terminal side, which will not be repeated here.

[0501] Figure 6B is a fourth flow diagram illustrating a method for performing CSI feedback on a network device according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a CSI feedback method for use with a network device 102, such as an access network device, in a communication system 100. As shown in Figure 6B , the CSI feedback method of this embodiment of the present disclosure includes step S6210.

[0502] In step S6210, first information is received.

[0503] The optional implementation of step S6210 can be found in step S2130 of FIG. 2A and other related parts of the embodiment involved in FIG. 2A , which will not be described in detail here.

[0504] In some possible embodiments, the above method may include the methods described in the above embodiments on the communication system side, terminal side, and network device side, which will not be repeated here.

[0505] In some possible embodiments, the present disclosure relates to a method for CSI feedback, which may include the following scheme:

[0506] The first solution: The number of spatial basis vectors (SD basis) in the horizontal and vertical dimensions of the network configuration is divided into L h (i.e., the number of spatial basis vectors in the horizontal dimension) and L v (i.e. the number of spatial basis vectors in the vertical dimension), and then the terminal passes Indicates the L selected from the horizontal dimension N1 candidate SD basis h SD basis (i.e. the first spatial basis vector), and through Indicates that L is selected from the vertical dimension N2 candidate SD basis v SD basis (i.e., the second spatial basis vector).

[0507] In this case, the indication of the oversampling factor may include the following:

[0508] Case 1: Pass Indicates that one of them contains N1N2 orthogonal SD basis groups (i.e., orthogonal spatial basis vector groups). Then, the horizontal dimension L is indicated by the first solution mentioned above. h and vertical dimension L v SD basis.

[0509] Case 1: Pass and It indicates that a horizontal dimension contains N1 orthogonal SD basis groups (ie, the first orthogonal spatial basis vector group) and a vertical dimension contains N2 SD basis groups (ie, the second orthogonal spatial basis vector group).

[0510] The second solution: The network is configured with a total number of SD basis L (i.e. the total number of spatial basis vectors), and L = L h L v The terminal still reports Indicates the L selected from the horizontal dimension N1 candidate SD basis hSD basis (i.e. the first spatial basis vector), and through Instructs itself to select L from the vertical dimension N2 candidate SD basis v SD basis (i.e., the second spatial basis vector).

[0511] In addition, the terminal also feeds back to the network device the indication information of the number of the first spatial basis vectors and the indication information of the number of the second spatial basis vectors. At this time, the number of the first spatial basis vectors is L h and the number of the second spatial basis vectors is L v .

[0512] Then, L h and L v The value indication methods of may include:

[0513] Method A: Through Indicate L h and L v The value of

[0514] Method B: Through and Indicate L h and L v The value of

[0515] Method C: Through and Indicate L h and L v The value of , or and Indicate L h and L v The value of

[0516] Method D: By pre-defining the information length, such as a1bits and a2bits indicating L h and L v value.

[0517] In some possible embodiments, the L described in the above-mentioned method A, method B, method C and method D is h and L v The indication information of the value of is carried in the feedback in CSI Part 1. The indication method of the oversampling factor is the same as that of Case 1 and Case 2 above.

[0518] It should be noted that the horizontal dimension L selected by the above terminal is h SD basis and vertical dimension L v The indication information of the SD basis and the indication information of the oversampling factor are both fed back in CSI Part 2.

[0519] Example 1 (first solution):

[0520] Assume that the number of SD basis of horizontal and vertical dimensions configured by the network for the terminal is divided into L h =2 and L v =2, the number of antenna ports in the horizontal dimension and the vertical dimension are N1=8 and N2=4 respectively, and the oversampling factors in the horizontal dimension and the vertical dimension are O1=4 and O2=4 respectively. According to the above-mentioned Alt1 solution, the terminal needs to report Indicates the 2 SD basis selected from the 8 candidate SD basis in the horizontal dimension, reported Indicates the 2 SD basis selected from the 4 candidate SD basis in the vertical dimension. Since O1=O2=4, the terminal uses the same overhead of indicating the oversampling factor in case 1 and case 2, that is, The total feedback cost is Then, the total 12 bits of indication overhead are reported in CSI part 2.

[0521] The overhead of using the traditional SD basis indication method is Where L = L h L v = 4, which is configured by the network to the terminal through RRC signaling. It can be seen that compared with the traditional SD basis indication method, the first solution can save 22-12=10 bits.

[0522] Example 2 (second solution):

[0523] The assumptions are similar to those of the first solution. Assume that the network configures the terminal with N1=8 and N2=4 antenna ports in the horizontal and vertical dimensions, respectively, and the oversampling factors in the horizontal and vertical dimensions are O1=4 and O2=4, respectively. The network also configures a total number of SD basis L=4, where the total SD basis refers to the horizontal dimension L. h SD basis and vertical dimension L v The number of SD basis is calculated by Kronecker product, and then L=L h L v . Where L h and L v The terminal independently selects and reports the channel conditions estimated by CSI-RS to the network. According to the above methods A, B, C and D, the corresponding L h and L v The indicated overhead is:

[0524] Method A:

[0525] Method B:

[0526] Method C: or

[0527] Mode D: Indicate L by predefined information length a1 = 3 bits and a2 = 2 bits h and L v If the value is , the total indication overhead is 5 bits.

[0528] If the terminal selects the SD basis of horizontal and vertical dimensions according to the channel conditions estimated by CSI-RS, the number of SD basis is divided into L h =2 and L v =2, according to Example 1, the terminal also needs to pass The indication overhead is used to indicate the selected SD basis. Assume that method A is used to indicate L h and L v , then the total instruction overhead is Compared with the traditional SD basis indication method Compared with the overhead, the indication overhead of 6 bits can still be reduced.

[0529] In some possible embodiments, the above L h and L v The indication information is carried in the CSI part 1 feedback, and other SD basis related indication information, that is, the overhead is The indication information is carried in CSI part 2 feedback.

[0530] 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) in any of the above methods.

[0531] 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 single 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 (ASIC) 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), and the functions of some or all of the above units or modules are realized 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, which 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 software called by the processor, and the rest by hardware circuits.

[0532] In the embodiment 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 CPU, a microprocessor, a graphics processing unit (GPU) (which can also 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, and the logical relationship of the above hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by an ASIC or PLD, such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document to implement the hardware circuit configuration 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.

[0533] Figure 7A is a structural diagram of a terminal shown according to an embodiment of the present disclosure. The structure of the terminal 101 may be as shown in Figure 7A. The terminal 101 may include: a transceiver module 7101. In some possible embodiments, the transceiver module 7101 is used to send first information, and the first information is used to indicate at least one of the first spatial basis vector of the horizontal dimension and the second spatial basis vector of the vertical dimension. Optionally, the transceiver module 7101 is used to execute at least one of the communication steps such as sending and / or receiving performed by the terminal 101 in any of the above methods (for example, step S2110, step S2120, step S2130, step S2140, step S2210, step S2220, step S2230, step S2240, step S2250, but not limited to this), which will not be repeated here.

[0534] Figure 7B is a structural diagram of a network device according to an embodiment of the present disclosure. The structure of the above-mentioned network device 102 may be as shown in Figure 7B. The network device 102 may include: a transceiver module 7201. In some possible embodiments, the transceiver module 7201 is used to receive first information, and the first information is used to indicate at least one of the first spatial basis vector of the horizontal dimension and the second spatial basis vector of the vertical dimension. Optionally, the above-mentioned transceiver module 7201 is used to execute at least one of the communication steps such as sending and / or receiving performed by the network device 102 in any of the above methods (for example, step S2110, step S2120, step S2130, step S2140, step S2210, step S2220, step S2230, step S2240, step S2250, but not limited to this), which will not be repeated here.

[0535] In some possible embodiments, the transceiver module may include a transceiver module 7101 and / or a transceiver module 7201. The transceiver module 7101 and the transceiver module 7201 may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0536] Figure 8A is a schematic diagram of the structure of a communication device according to an embodiment of the present disclosure. As shown in Figure 8A, the communication device 8100 can be a terminal 101 (such as a user device, etc.), or a network device 102 (such as an access network device), or a chip, chip system, or processor that supports the network device to implement any of the above methods, or a chip, chip system, or processor that supports the terminal to implement any of the above methods. The communication device 8100 can be used to implement the method described in the above method embodiment. For details, please refer to the description of the above method embodiment.

[0537] 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 communication protocols and communication data, and the central processing unit can be used to control the communication device (such as a base station, baseband chip, terminal device, terminal device chip, DU or CU, etc.), execute programs, and process program data.

[0538] In some possible 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 of sending and / or receiving in the above method (e.g., step S2110, step S2120, step S2130, step S2140, step S2210, step S2220, step S2230, step S2240, and step S2250, 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.

[0539] In some possible embodiments, the communication device 8100 further includes one or more memories 8103 for storing data. Alternatively, all or part of the memories 8103 may be located outside the communication device 8100. In alternative embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuits 8104 are connected to the memories 8103 and may be configured to receive data from the memories 8103 or other devices, or to send data to the memories 8103 or other devices. For example, the interface circuits 8104 may read data stored in the memories 8103 and send the data to the processor 8101.

[0540] 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.

[0541] FIG8B is a schematic diagram of a chip structure 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 chip structure 8200 shown in FIG8B , but the present invention is not limited thereto.

[0542] In some possible embodiments, the chip 8200 may include one or more processors 8201 .

[0543] In some possible embodiments, chip 8200 may further include one or more interface circuits 8202. Alternatively, terms such as interface circuit, interface, and transceiver pin may be used interchangeably. In some possible embodiments, chip 8200 may further include 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 configured to receive data from memory 8203 or other devices, or 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.

[0544] In some possible embodiments, the interface circuit 8202 performs at least one of the communication steps such as sending and / or receiving in the above method (e.g., step S2110, step S2120, step S2130, step S2140, step S2210, step S2220, step S2230, step S2240, and step S2250, but not limited thereto). The interface circuit 8202 performing the communication steps such as sending and / or receiving in the above 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.

[0545] The embodiments of the present disclosure further provide a storage medium having instructions stored thereon. When the instructions are executed on the communication device 8100, the communication device 8100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited 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.

[0546] 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.

[0547] The embodiments of the present disclosure also provide a computer program, which, when executed on a computer, enables the computer to execute any one of the above methods.

[0548] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. The embodiments disclosed herein are intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed in the embodiments disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0549] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A channel state information feedback method, performed by a terminal, the method comprises: sending first information, the first information being used to indicate at least one of the following: a first spatial domain basis vector in the horizontal dimension; a second spatial domain basis vector in the vertical dimension.

2. The method according to claim 1, wherein, the first spatial domain basis vector is indicated by a first field of the first information.

3. The method according to claim 2, wherein, the bit value of the first field is determined based on the number of antenna ports in the horizontal dimension and the number of the first spatial domain basis vectors.

4. The method according to claim 2 or 3, wherein, The bit value of the first field is calculated according to the following expression: Among them, N 1 is the number of antenna ports in the horizontal dimension; L h is the number of the first spatial domain basis vectors.

5. The method according to any one of claims 1 to 4, wherein, the second spatial domain basis vector is indicated by a second field of the first information.

6. The method according to claim 5, wherein, the bit value of the second field is determined based on the number of antenna ports in the vertical dimension and the number of the second spatial domain basis vectors.

7. The method according to claim 5 or 6, wherein, The bit value of the second field is calculated according to the following expression: where N 2 is the number of antenna ports in the vertical dimension; L v is the number of the second spatial domain basis vectors.

8. The method according to any one of claims 1 to 7, wherein, the method further comprises: sending second information, the second information being used to indicate at least one of the following: a first orthogonal spatial domain basis vector group in the horizontal dimension; a second orthogonal spatial domain basis vector group in the vertical dimension.

9. The method according to any one of claims 1 to 8, wherein, the method further comprises: receiving third information, the third information being used to indicate the number of spatial domain basis vectors, and the number of spatial domain basis vectors is used to determine at least one of the first spatial domain basis vector and the second spatial domain basis vector.

10. The method according to claim 9, wherein, the number of spatial domain basis vectors includes at least one of the following: the number of spatial domain basis vectors in the horizontal dimension; the number of spatial domain basis vectors in the vertical dimension.

11. The method according to claim 9, wherein, the number of spatial domain basis vectors includes the total number of spatial domain basis vectors, and the total number of spatial domain basis vectors is equal to the product of the number of spatial domain basis vectors in the horizontal dimension and the number of spatial domain basis vectors in the vertical dimension.

12. The method according to claim 11, wherein, the method further comprises: sending fourth information, the fourth information being used to indicate at least one of the following: the number of the first spatial domain basis vectors; the number of the second spatial domain basis vectors.

13. The method according to claim 12, wherein, the number of the first spatial domain basis vectors is indicated by a third field of the fourth information.

14. The method according to claim 13, wherein, the bit value of the third field is determined by at least one of the following: the number of spatial domain basis vectors; the number of antenna ports in the horizontal dimension; a first preset value.

15. The method according to claim 12, wherein, the number of the second spatial domain basis vectors is indicated by a fourth field of the fourth information.

16. The method according to claim 15, wherein, the bit value of the fourth field is determined by at least one of the following: the number of spatial domain basis vectors; the number of antenna ports in the vertical dimension; a second preset value.

17. The method according to any one of claims 9 to 16, wherein, The method further includes: Receiving fifth information, where the fifth information includes at least one of the following: The number of antenna ports in the horizontal dimension; The number of antenna ports in the vertical dimension; The oversampling factor in the horizontal dimension; The oversampling factor in the vertical dimension.

18. A channel state information feedback method, performed by a network device, the method includes: Receiving first information, where the first information is used to indicate at least one of the following: The first spatial domain basis vector in the horizontal dimension; The second spatial domain basis vector in the vertical dimension.

19. The method according to claim 18, wherein, The first spatial domain basis vector is indicated by a first field of the first information.

20. The method according to claim 19, wherein, The bit value of the first field is determined based on the number of antenna ports in the horizontal dimension and the number of the first spatial domain basis vectors.

21. The method according to claim 19 or 20, wherein, The bit value of the first field is calculated according to the following expression: Among them, N 1 is the number of antenna ports in the horizontal dimension; L h is the number of the first spatial domain basis vectors.

22. The method according to any one of claims 18 to 21, wherein, The second spatial domain basis vector is indicated by a second field of the first information.

23. The method according to claim 22, wherein, The bit value of the second field is determined based on the number of antenna ports in the vertical dimension and the number of the second spatial domain basis vectors.

24. The method according to claim 22 or 23, wherein, The bit value of the second field is calculated according to the following expression: where N 2 is the number of antenna ports in the vertical dimension; L v is the number of the second spatial domain basis vectors.

25. The method according to any one of claims 18 to 24, wherein, The method further includes: Receiving second information, where the second information is used to indicate at least one of the following: The first set of orthogonal spatial domain basis vectors in the horizontal dimension; The second set of orthogonal spatial domain basis vectors in the vertical dimension.

26. The method according to any one of claims 18 to 25, wherein, The method further includes: Sending third information, where the third information is used to indicate the number of spatial domain basis vectors, and the number of spatial domain basis vectors is used to determine at least one of the first spatial domain basis vector and the second spatial domain basis vector.

27. The method according to claim 26, wherein, The number of spatial domain basis vectors includes at least one of the following: The number of spatial domain basis vectors in the horizontal dimension; The number of spatial domain basis vectors in the vertical dimension.

28. The method according to claim 26, wherein, The number of spatial domain basis vectors includes the total number of spatial domain basis vectors, where the total number of spatial domain basis vectors is equal to the product of the number of spatial domain basis vectors in the horizontal dimension and the number of spatial domain basis vectors in the vertical dimension.

29. The method according to claim 28, wherein, The method further includes: Receiving fourth information, where the fourth information is used to indicate at least one of the following: The number of the first spatial domain basis vectors; The number of the second spatial domain basis vectors.

30. The method according to claim 29, wherein, The number of the first spatial domain basis vectors is indicated by a third field of the fourth information.

31. The method according to claim 30, wherein, The bit value of the third field is determined by at least one of the following: The number of spatial domain basis vectors; The number of antenna ports in the horizontal dimension; A first preset value.

32. The method according to claim 29, wherein, The number of the second spatial domain basis vectors is indicated by a fourth field of the fourth information.

33. The method according to claim 32, wherein, the bit value of the fourth field is determined by at least one of the following: the number of spatial domain basis vectors; the number of antenna ports in the vertical dimension; a second preset value.

34. The method according to any one of claims 26 to 33, wherein, the method further comprises: transmitting fifth information, the fifth information comprising at least one of the following: the number of antenna ports in the horizontal dimension; the number of antenna ports in the vertical dimension; the oversampling factor in the horizontal dimension; the oversampling factor in the vertical dimension.

35. A terminal, comprising: a transceiver module, configured to transmit first information, the first information being used to indicate at least one of the following: the first spatial domain basis vectors in the horizontal dimension; the second spatial domain basis vectors in the vertical dimension.

36. A network device, comprising: a transceiver module, configured to receive first information, the first information being used to indicate at least one of the following: the first spatial domain basis vectors in the horizontal dimension; the second spatial domain basis vectors in the vertical dimension.

37. A communication device, comprising: one or more processors; one or more memories for storing instructions; wherein, the processor is configured to call the instructions to cause the communication device to execute the method according to any one of claims 1 to 17, 18 to 34.

38. A communication system, comprising: a terminal and a network device; wherein, the terminal is configured to execute the method according to any one of claims 1 to 17; the network device is configured to execute the method according to any one of claims 18 to 34.

39. A storage medium, wherein, the storage medium stores instructions, and when the instructions are executed by a processor, the method according to any one of claims 1 to 17, 18 to 34 is executed.

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