Communication method, device, system, storage medium and computer program product

Abstract

The invention relates to a communication method, device and system, a storage medium and a computer program product. The communication method executed by a terminal comprises: sending a first message to a network device, the first message being used for indicating a spatial domain vector selected by the terminal when a rank of a channel matrix is greater than 4, the channel matrix being obtained by the terminal through channel estimation, and the rank being greater than 4; the airspace vector is used for the network equipment to determine precoding of downlink data transmission. The selection condition of the airspace vector is indicated to the network equipment when the rank is greater than 4, the network equipment can be helped to select a proper pre-code so as to better communicate with the terminal, the interference between transmission information is reduced, and the receiving accuracy is enhanced.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a communication method, device, system, storage medium and computer program product. Background Art

[0002] In order to improve the system spectrum efficiency or coverage, it currently supports expanding the number of transmitting antenna ports from 32 to 128, and also supports the use of Type 1 (Type I) and Type 2 (Type II) port selection codebooks to implement Channel Status Information (CSI) feedback. Summary of the invention

[0003] The embodiments of the present disclosure provide a communication method, device, system, storage medium, and computer program product.

[0004] According to a first aspect of an embodiment of the present disclosure, a communication method is proposed, which is executed by a terminal, and the method includes: sending a first message to a network device, the first message being used to indicate a spatial domain vector selected by the terminal when the rank of a channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal performing channel estimation, and the spatial domain vector is used by the network device to determine precoding for downlink data transmission.

[0005] According to a second aspect of an embodiment of the present disclosure, a communication method is proposed, which is executed by a network device, and the method includes: receiving a first message sent by a terminal; determining a spatial domain vector selected by the terminal when the rank of a channel matrix is ​​greater than 4 based on the first message, wherein the channel matrix is ​​obtained by channel estimation by the terminal; and determining precoding for downlink data transmission at least based on the spatial domain vector selected by the terminal.

[0006] According to the third aspect of an embodiment of the present disclosure, a terminal is proposed, comprising: a transceiver module, used to send a first message to a network device, wherein the first message is used to indicate a spatial domain vector selected by the terminal when the rank of a channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal performing channel estimation, and the spatial domain vector is used by the network device to determine precoding for downlink data transmission.

[0007] According to the fourth aspect of an embodiment of the present disclosure, a network device is proposed, comprising: a transceiver module for receiving a first message sent by a terminal; a processing module for determining, based on the first message, a spatial domain vector selected by the terminal when the rank of a channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by channel estimation by the terminal; and determining precoding for downlink data transmission at least based on the spatial domain vector selected by the terminal.

[0008] According to the fifth aspect of an embodiment of the present disclosure, a communication device is proposed, comprising: one or more processors; a memory coupled to the processor, wherein executable instructions are stored in the memory, and when the executable instructions are executed by the processor, the communication method described in the first aspect or the second aspect is executed.

[0009] According to the sixth aspect of an embodiment of the present disclosure, a communication system is proposed, including a terminal and a network device, wherein the terminal is configured to implement the communication method described in the first aspect, and the network device is configured to implement the communication method described in the second aspect.

[0010] According to a seventh aspect of an embodiment of the present disclosure, a storage medium is proposed, wherein the storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the communication method described in the first aspect or the second aspect.

[0011] According to an eighth aspect of an embodiment of the present disclosure, a computer program product is proposed, comprising a computer program and / or instructions, wherein the computer program and / or instructions, when executed by a communication device, implement the communication method described in the first aspect or the second aspect.

[0012] By adopting the above technical solution of the present disclosure, at least the following beneficial technical effects can be achieved:

[0013] The terminal sends a first message to the network device, and the first message is used to indicate the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal through channel estimation, and the selected spatial vector is used by the network device to determine the precoding of downlink data transmission. This realizes indicating the selection of the spatial vector to the network device when the rank is greater than 4, which can help the network device select a suitable precoding to better communicate with the terminal, reduce interference between transmitted information, and enhance reception accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for describing the embodiments are introduced below. The following drawings are only some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0015] Figure 1A It is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure.

[0016] Figure 1B It is a schematic diagram of a spatial domain vector orthogonal to the first spatial domain vector according to an embodiment of the present disclosure.

[0017] Figure 2 It is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0018] Figure 3A It is a flowchart of a communication method according to an embodiment of the present disclosure.

[0019] Figure 3B It is a flowchart of a communication method according to an embodiment of the present disclosure.

[0020] Figure 3C It is a flowchart of a communication method according to an embodiment of the present disclosure.

[0021] Figure 3D It is a flowchart of a communication method according to an embodiment of the present disclosure.

[0022] Figure 3E It is a flowchart of a communication method according to an embodiment of the present disclosure.

[0023] Figure 4A It is a flowchart of a communication method according to an embodiment of the present disclosure.

[0024] Figure 4B It is a flowchart of a communication method according to an embodiment of the present disclosure.

[0025] Figure 5 It is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0026] Figure 6 It is a schematic diagram of the structure of a terminal proposed according to an embodiment of the present disclosure.

[0027] Figure 7 It is a structural diagram of a network device proposed according to an embodiment of the present disclosure.

[0028] Fig. 8A It is a structural diagram of a communication device proposed according to an embodiment of the present disclosure.

[0029] Figure 8B It is a schematic diagram of the structure of a chip proposed according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] The embodiments of the present disclosure provide a communication method, device, system, storage medium, and computer program product.

[0031] In a first aspect, an embodiment of the present disclosure proposes a communication method executed by a terminal, the method comprising: sending a first message to a network device, the first message being used to indicate a spatial domain vector selected by the terminal when the rank of a channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal performing channel estimation, and the spatial domain vector is used by the network device to determine precoding for downlink data transmission.

[0032] In the above embodiment, when the rank is greater than 4, the terminal indicates the selection of the spatial vector to the network device, which can help the network device select appropriate precoding to better communicate with the terminal, reduce interference between transmitted information, and enhance the terminal's reception accuracy.

[0033] In combination with some embodiments of the first aspect, in some embodiments, before sending a first message to a network device, it includes: receiving a second message sent by the network device, the second message including codebook parameter information; selecting the spatial domain vector according to the codebook parameter information and the estimated downlink channel information.

[0034] In the above embodiment, the terminal performs channel estimation based on the Channel Status Information-Reference Signal (CSI-RS), and can calculate the maximum number of streams with the minimum downlink channel coherence, which is called the rank of the channel matrix. Further combined with the codebook parameter information, the spatial domain vector that best matches the current channel state can be selected for reporting, which can improve the communication effect between the network device and the terminal, enhance the accuracy of the interactive information between the network device and the terminal, and enable the terminal to better receive the information sent by the network device.

[0035] In combination with some embodiments of the first aspect, in some embodiments, the first message includes first information, where the first information is used to indicate a first spatial domain vector selected by the terminal from a first vector set;

[0036] The first vector set includes N1O1N2O2 candidate spatial domain vectors, and the length of the first information is bits, or the length of the first information is bits, where N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor in the first dimension, and O2 represents the oversampling factor in the second dimension. The symbol for rounding up.

[0037] In the above embodiment, the length is Bit or The first information of the bit can indicate any spatial vector of the horizontal dimension and / or vertical dimension selected from N1O1N2O2 candidate spatial vectors, so that the selection range of the first spatial vector is not restricted. The terminal can select and report the first spatial vector that is more suitable for the current channel state information or can freely select the first spatial vector, which can help the network select a suitable precoding matrix to better serve users.

[0038] In combination with some embodiments of the first aspect, in some embodiments, the first message further includes i-th information, where the i-th information is used to indicate an i-th spatial domain vector selected by the terminal from the second vector set, where i is an integer greater than or equal to 2;

[0039] The second vector set is determined from the first vector set with reference to the first spatial vector, the candidate spatial vectors in the second vector set are orthogonal to the first spatial vector in at least one dimension, the second vector set includes K1 candidate spatial vectors, and the length of the i-th information is Bit.

[0040] In the above embodiment, multiple spatial domain vectors can be selected from the second vector set and respectively transmitted through The information is reported, a length of The information can clearly indicate any spatial vector of the horizontal dimension and / or vertical dimension in the second vector set. Therefore, the selected spatial vector can be any spatial vector of the horizontal dimension and / or vertical dimension in the second vector set, so that the selection range of the selected spatial vector is not restricted, and the terminal can select and report a spatial vector that is more suitable for the current channel state information or a freely selected spatial vector. In addition, this method of independently indicating each selected spatial vector can enable the network device to clearly determine each spatial vector selected by the terminal, thereby improving the performance of the selected codebook and reducing the spatial vector indication overhead.

[0041] In combination with some embodiments of the first aspect, in some embodiments, the first message further includes j-th indication information, where the j-th indication information is used to indicate a j-th spatial domain vector selected by the terminal from a j-th vector set, where j is an integer greater than or equal to 2;

[0042] The j-th vector set is determined from the j-1-th vector set with reference to the j-1-th spatial domain vector, and the candidate spatial domain vectors in the j-th vector set are orthogonal to the j-1-th spatial domain vector in at least one dimension.

[0043] In the above embodiment, after determining the j-1th spatial vector, a candidate vector set of the jth spatial vector can be determined to narrow the candidate range of the jth spatial vector. This method of hierarchically determining each selected spatial vector can reduce the resource overhead of reporting the selected spatial vector.

[0044] In combination with some embodiments of the first aspect, in some embodiments, when j=2, the j-th vector set includes K1 candidate spatial domain vectors, and the length of the j-th indication information is Bit.

[0045] In conjunction with some embodiments of the first aspect, in some embodiments, K1 is calculated in the following manner:

[0046] K1=(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1).

[0047] In the above embodiment, the number of candidate spatial domain vectors included in the second vector set is standardized.

[0048] In combination with some embodiments of the first aspect, in some embodiments, when j ≥ 3, the j-th vector set includes K2 candidate spatial domain vectors, and the length of the j-th indication information is bits, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

[0049] In the above embodiment, when j≥3, the maximum number of candidate spatial domain vectors included in the j-th vector set is regulated.

[0050] In combination with some embodiments of the first aspect, in some embodiments, the N1O1N2O2 candidate spatial domain vectors correspond to N1N2 candidate clusters, and one candidate cluster includes O1O2 candidate spatial domain vectors;

[0051] The first message also includes a second message and L-1 third messages, wherein v represents the number of layers of transmitted data;

[0052] The second information is used to indicate the L-1 clusters selected by the terminal from the N1N2 candidate clusters. The length of the second information is Bit;

[0053] A third information corresponds to a cluster selected by the terminal, and is used to indicate a spatial vector selected by the terminal from the candidate spatial vectors of the cluster. The length of the third information is Bit.

[0054] In the above embodiment, N1O1N2O2 candidate spatial domain vectors can be divided into N1N2 candidate clusters, where one candidate cluster includes O1O2 candidate spatial domain vectors. The second information of the bit can indicate the clusters where all the selected L-1 spatial domain vectors are located, and are respectively transmitted through the length of The third information of the bit can indicate which spatial vector in the corresponding cluster one of the selected L-1 spatial vectors is. This method of indicating each selected spatial vector can enable the network device to clearly determine each spatial vector selected by the terminal, thereby improving the performance of the selected codebook.

[0055] In combination with some embodiments of the first aspect, in some embodiments, the first message includes one fourth information and L fifth information, wherein v represents the number of layers of transmitted data. is the calculation symbol for rounding up;

[0056] The fourth information is used to indicate L clusters selected by the terminal from the candidate clusters;

[0057] A fifth information corresponds to a cluster selected by the terminal, and is used to indicate a spatial domain vector selected by the terminal from candidate spatial domain vectors of the cluster.

[0058] In combination with some embodiments of the first aspect, in some embodiments, the total number of candidate spatial domain vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial domain vectors, wherein N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor of the first dimension, and O2 represents the oversampling factor of the second dimension;

[0059] The length of the fourth information is bits, the length of the fifth information is Bit.

[0060] In the above embodiment, N1O1N2O2 candidate spatial domain vectors can be divided into N1N2 candidate clusters, where one candidate cluster includes O1O2 candidate spatial domain vectors. The second information of the bit can indicate the cluster where all the selected L spatial domain vectors are located, and is respectively transmitted through the length of The third information of the bit can indicate which spatial vector in the corresponding cluster any selected spatial vector is. This method of indicating each selected spatial vector can enable the network device to clearly determine each spatial vector selected by the terminal, thereby improving the performance of the selected codebook.

[0061] In combination with some embodiments of the first aspect, in some embodiments, the first message further includes sixth information, and the length of the sixth information is Bit used to indicate the oversampling offset.

[0062] In the above embodiment, the length is The sixth information of the bit may indicate an oversampling offset, which may help the network device determine the spatial domain vector selected by the terminal.

[0063] In a second aspect, an embodiment of the present disclosure proposes a communication method, which is executed by a network device, and the method includes: receiving a first message sent by a terminal; determining a spatial domain vector selected by the terminal when the rank of a channel matrix is ​​greater than 4 based on the first message, wherein the channel matrix is ​​obtained by channel estimation by the terminal; and determining precoding for downlink data transmission at least based on the spatial domain vector.

[0064] In combination with some embodiments of the second aspect, in some embodiments, the method further includes: sending a second message to the terminal, the second message including codebook parameter information, and the codebook parameter information is used by the terminal to select the spatial domain vector in combination with the estimated downlink channel information.

[0065] In combination with some embodiments of the second aspect, in some embodiments, determining the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message includes: determining the first spatial domain vector selected by the terminal from a first vector set according to the first information in the first message; wherein the first vector set includes N1O1N2O2 candidate spatial domain vectors, and the length of the first information is bits, or the length of the first information is bits, where N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor in the first dimension, and O2 represents the oversampling factor in the second dimension. The symbol for rounding up.

[0066] In combination with some embodiments of the second aspect, in some embodiments, determining the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message also includes: determining the i-th spatial domain vector selected by the terminal from the second vector set according to the i-th information in the first message, where i is an integer greater than or equal to 2; wherein the second vector set is determined by the terminal from the first vector set with the first spatial domain vector as a reference, the candidate spatial domain vectors in the second vector set are orthogonal to the first spatial domain vector in at least one dimension, the second vector set includes K1 candidate spatial domain vectors, and the length of the i-th information is Bit.

[0067] In combination with some embodiments of the second aspect, in some embodiments, determining the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message also includes: determining the jth spatial domain vector selected by the terminal from the jth vector set according to the jth indication information in the first message, where j is an integer greater than or equal to 2; wherein the jth vector set is determined by the terminal from the j-1th vector set with reference to the j-1th spatial domain vector, and the candidate spatial domain vectors in the jth vector set are orthogonal to the j-1th spatial domain vector in at least one dimension.

[0068] In combination with some embodiments of the second aspect, in some embodiments, when j=2, the j-th vector set includes K1 candidate spatial domain vectors, and the length of the j-th indication information is Bit.

[0069] In conjunction with some embodiments of the second aspect, in some embodiments, K1 is calculated in the following manner:

[0070] K1=(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1).

[0071] In combination with some embodiments of the second aspect, in some embodiments, when j ≥ 3, the j-th vector set includes K2 candidate spatial domain vectors, and the length of the j-th indication information is bits, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

[0072] In combination with some embodiments of the second aspect, in some embodiments, the N1O1N2O2 candidate spatial domain vectors correspond to N1N2 candidate clusters, and one candidate cluster includes O1O2 candidate spatial domain vectors; the first message also includes a second information and L-1 third information, wherein v represents the number of layers of transmitted data, and a third information corresponds to a cluster selected by the terminal from the N1N2 candidate clusters;

[0073] The determining, according to the first message, the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, further includes: determining, according to the second information, L-1 clusters selected by the terminal from the N1N2 candidate clusters, wherein the length of the second information is bit; determining, according to a third information, a spatial vector selected by the terminal from the candidate spatial vectors of a corresponding cluster, wherein the length of the third information is Bit.

[0074] In combination with some embodiments of the second aspect, in some embodiments, the first message includes one fourth information and L fifth information, wherein v represents the number of layers of transmitted data. is the calculation symbol for rounding up;

[0075] The determining, according to the first message, the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, includes: determining, according to the fourth information, L clusters selected by the terminal from multiple candidate clusters, a fifth information corresponding to a cluster selected by the terminal; and determining, according to the fifth information, a spatial domain vector selected by the terminal from candidate spatial domain vectors of a corresponding cluster, wherein a fifth information corresponds to a cluster selected by the terminal.

[0076] In combination with some embodiments of the second aspect, in some embodiments, the total number of candidate spatial domain vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial domain vectors, wherein N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor of the first dimension, and O2 represents the oversampling factor of the second dimension; the length of the fourth information is bits, the length of the fifth information is Bit.

[0077] In combination with some embodiments of the second aspect, in some embodiments, determining the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message further includes: determining the oversampling offset according to sixth information in the first message, wherein the length of the sixth information is Bit.

[0078] In a third aspect, an embodiment of the present disclosure proposes a terminal, which includes at least one of a transceiver module and a processing module; wherein the terminal is used to execute an optional implementation method of the first aspect.

[0079] In a fourth aspect, an embodiment of the present disclosure proposes a network device, which includes at least one of a transceiver module and a processing module; wherein the network device is used to execute the optional implementation method of the second aspect.

[0080] In a fifth aspect, an embodiment of the present disclosure proposes a terminal, which includes: one or more processors; wherein the terminal is used to execute an optional implementation method of the first aspect.

[0081] In a sixth aspect, an embodiment of the present disclosure proposes a network device, which includes: one or more processors; wherein the network device is used to execute the optional implementation method of the second aspect.

[0082] In the seventh aspect, an embodiment of the present disclosure proposes a communication system, which includes: a terminal and a network device; wherein the terminal is configured to execute the method described in the optional implementation manner of the first aspect, and the network device is configured to execute the method described in the optional implementation manner of the second aspect.

[0083] In an eighth aspect, an embodiment of the present disclosure proposes a storage medium, wherein the storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the method described in the optional implementation of the first and second aspects.

[0084] In a ninth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the optional implementation of the first and second aspects.

[0085] In a tenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first and second aspects.

[0086] In an eleventh aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or the chip system includes a processing circuit configured to execute the method described in the optional implementation of the first aspect and the second aspect.

[0087] It is understandable that the above-mentioned terminals, network devices, communication systems, storage media, program products, computer programs, chips or chip systems are all used to execute the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods, which will not be repeated here.

[0088] The embodiments of the present disclosure propose a communication method, device, system, storage medium and computer program product. In some embodiments, the terms such as communication method, information processing method, high-rank spatial vector indication method based on Type I codebook feedback, etc. can be replaced with each other, the terms such as communication device, information processing device, high-rank spatial vector indication device based on Type I codebook feedback, etc. can be replaced with each other, and the terms such as communication system, information processing system, high-rank spatial vector indication system based on Type I codebook feedback, etc. can be replaced with each other.

[0089] The embodiments of the present disclosure are not exhaustive, but are only illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined, for example, some or all of the steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0090] In each embodiment of the present disclosure, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between the embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form a new embodiment based on their internal logical relationships.

[0091] 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.

[0092] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular form, such as "a", "an", "the", "above", "said", "aforementioned", "this", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun after the article may be understood as a singular expression or a plural expression.

[0093] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0094] In some embodiments, the terms “at least one,” “one or more,” “a plurality of,” “multiple,” etc. may be used interchangeably.

[0095] In some embodiments, "at least one of A and B", "A and / or B", "A in one case, B in another case", "in response to one case A, in response to another case B", etc., may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, A and B (both A and B are executed). When there are more branches such as A, B, C, etc., the above is also similar.

[0096] In some embodiments, the recording method of "A or B" may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). When there are more branches such as A, B, C, etc., the above is also similar.

[0097] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects, and do not constitute restrictions on the position, order, priority, quantity or content of the description objects. The statement of the description object refers to the description in the context of the claims or embodiments, and should not constitute unnecessary restrictions due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields", and the "first" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number, and can be one or more. Taking the "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes may be the same or different. For example, if the description object is "device", then the "first device" and the "second device" may be the same device or different devices, and their types may be the same or different. For another example, if the description object is "information", then the "first information" and the "second information" may be the same information or different information, and their contents may be the same or different.

[0098] In some embodiments, “including A”, “comprising A”, “used to indicate A”, and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0099] In some embodiments, terms such as "in response to ...", "in response to determining ...", "in the case of ...", "at the time of ...", "when ...", "if ...", "if ...", etc. can be used interchangeably.

[0100] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not lower than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "no more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0101] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0102] In some embodiments, "network" may be interpreted as devices included in the network (eg, access network equipment, core network equipment, etc.).

[0103] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station (radio base station)", "fixed station (fixed station)", "node (node)", "access point (access point)", "transmission point (TP)", "reception point (reception point, RP)", "transmission and / or reception point (transmission / reception point, TRP)", "panel (panel)", "antenna panel (antenna panel)", "antenna array (antenna array)", "cell (cell)", "macro cell (macro cell)", "small cell (small cell)", "femto cell (femto cell)", "pico cell (pico cell)", "sector (sector)", "cell group (cell)", "serving cell (serving cell)", "carrier (carrier)", "component carrier (component carrier)", "bandwidth part (bandwidth part, BWP)" and the like can be used interchangeably.

[0104] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client and the like can be used interchangeably.

[0105] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the access network device, the core network device, or the network device and the communication between the terminals is replaced by the communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the terminal has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0106] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may also be configured to have a structure that has all or part of the functions of the terminal.

[0107] In some embodiments, acquisition of data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0108] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0109] In addition, each element, each row, or each column in the table of the embodiments of the present disclosure may be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns may also be implemented as an independent embodiment.

[0110] Figure 1A FIG. 1 is a schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure. Figure 1A As shown, the communication system 100 may include a terminal 101 and a network device 102 .

[0111] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited to these.

[0112] In some embodiments, the network device 102 may include at least one of an access network device and a core network device.

[0113] Optionally, the network device 102 is an access network device. Optionally, the access network device is, for example, a node or device that accesses a terminal to a wireless network, and the access network device may include an evolved NodeB (eNB), a next generation eNB (ng-eNB), a next generation NodeB (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.

[0114] In some embodiments, the network device 102 is a base station. Optionally, the base station is, for example, a macro base station, a micro base station (also called a small station), a relay station, an access point, a 5G base station or a future base station, a satellite, a transmission point (Transmitting and Receiving Point, TRP), a transmitting point (Transmitting Point, TP), a mobile switching center, or other devices that assume the function of a base station in a communication system, etc., which are not specifically limited in the embodiments of the present disclosure. For the convenience of description, in all embodiments of the present disclosure, the devices that provide wireless communication functions for terminal devices are collectively referred to as network devices or base stations.

[0115] In some embodiments, the network device 102 is a core network device. Optionally, the core network device may be a device including a first network element, a second network element, etc., or may be a plurality of devices or a group of devices, including all or part of the first network element, the second network element, etc. The network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0116] In some embodiments, the technical solution of the present disclosure may be applicable to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure may become internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces may be implemented through software or programs.

[0117] In some embodiments, the access network device may be composed of a centralized unit (central unit, CU) and a distributed unit (distributed unit, DU), wherein the CU may also be referred to as a control unit (control unit). The CU-DU structure may be used to split the protocol layer of the access network device, with some functions of the protocol layer being centrally controlled by the CU, and the remaining part or all of the functions of the protocol layer being distributed in the DU, and the DU being centrally controlled by the CU, but not limited to this.

[0118] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. A person of ordinary skill in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0119] The following embodiments of the present disclosure can be applied to Figure 1A The communication system 100, or a portion thereof, is shown but is not limited thereto. Figure 1A The various entities shown are examples, and the communication system may include Figure 1A All or part of the subject, and may also include Figure 1A The number and form of other entities are arbitrary, each entity can be physical or virtual, the connection relationship between the entities is illustrative, the entities can be connected or disconnected, the connection can be in any way, it can be direct or indirect, and it can be wired or wireless.

[0120] The embodiments of the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine-to-Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), systems using other communication methods, next-generation systems based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G, etc.) for application.

[0121] In some embodiments, in order to further improve the system spectrum efficiency or coverage, it is currently supported to expand the number of transmit antenna ports from 32 to 128, and it is also supported to use Type 1 and Type II codebooks to implement CSI feedback. CSI-RS is 48, 64 or 128, and the corresponding horizontal dimension port number N1 and vertical dimension port number N2 are shown in Table 1 below.

[0122]

[0123] Table 1

[0124] In some embodiments, when Rank=5-8, Type I single panel codebook (SP CB) supports two solutions: Solution A and Solution B, as shown below.

[0125] For Rel-19 Type-I SP CB refinement of 48, 64 and 128 CSI-RS ports with RI (Rank Indication) = 5-8, the following schemes are supported:

[0126] Supports the same O1=O2 values ​​as RI=1-4;

[0127] Solution A (based on Solution 3 described in RAN1#116bis):

[0128] W1 structure: The first SD basis vector is freely selected, and the following 2 (RI=5-6) or 3 space domain (SD) basis vectors (RI=7-8) are freely selected so that they are orthogonal in at least one dimension (horizontal or vertical).

[0129] For RI=5-8, the v layers are mapped to the selected SD basis vectors following the legacy Rel-15 Type-I.

[0130] W2 structure: follows the traditional Rel-15 Type-I RI=5-8.

[0131] Solution B (based on Solution 2 described in RAN1#116bis):

[0132] W1 structure: For RI = v, independently select different Spatial Domain (SD) basis vectors, where each SD basis vector is applied to two corresponding layers, following the traditional Rel-15 Type-I with RI=5-8, but if v is an odd number, the last SD basis vector is applied to the isolated layer.

[0133] The SD basis vectors are freely selected from a set of N1N2 orthogonal SD Discrete Fourier Transform (DFT) basis vectors by combining indications.

[0134] W2 structure: For an isolated layer, the inter-polarization co-phasing is selected from {1, j, -1, -j}. For two layers sharing the same SD basis vector, the inter-polarization co-phasing between the two layers is selected from the following pair {(1, -1), (j, -j)} to achieve inter-layer orthogonality.

[0135] Rel-19 only supports scheme A (RI=1-4+RI=5-8) and scheme B (RI=1-4+RI=5-5).

[0136] In some embodiments, the Type I SP CB structure can be expressed as W=W1W2, and the W1 structure and W2 structure of scheme A are as follows:

[0137] W1 structure: Select the first spatial basis vector (SD vector) from all candidate spatial basis vectors (SD vector), and then select SD vectors, where v is the rank value. Each SD vector contains a horizontal dimension vector and a vertical dimension vector, and is calculated by the horizontal dimension vector and the vertical dimension vector through the Kronecker product. The horizontal dimension vector and the vertical dimension vector in the total of 3 or 4 SD vectors selected are orthogonal in at least one dimension, thereby ensuring the orthogonality between the SDvectors.

[0138] In some embodiments, Figure 1B As shown, b0 is the first SD vector selected by the UE, and then with it as a reference, the SD vectors orthogonal to the horizontal and / or vertical vectors in the first SD vector are Figure 1B In the gray filled part, the total number of SD vectors (excluding b0) is (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1). Among them, O1 and O2 represent the oversampling factors of the horizontal and vertical vectors respectively.

[0139] In some embodiments, the SD vectors to v layer mapping method when Rank = v = 5 to 8 of Rel-15 Type I SP CB is used to map the SD vectors selected by the UE to the v layer. SD vectors are mapped to the v layer.

[0140] In some embodiments, W2 structure: the design method of the inter-polarization co-phase factor of each layer is the same as the design method of the inter-polarization co-phase factor of each layer when Rank = 5 to 8 of the traditional Rel-15 Type I SP CB, that is, some layers use the same co-phase factor, and the co-phase factor of some layers is set to 1.

[0141] In some embodiments, for Type I SP CB using the above-mentioned scheme A structure, when Rank=5-8, it is necessary to indicate 3 or 4 mutually orthogonal SD vectors selected by the UE. However, there is currently no SD vector indication method when Rank>4.

[0142] In some embodiments, a method for selecting two SD vectors is provided:

[0143] Method 1: Divide the candidate N1O1N2O2 SD vectors into N1N2 clusters, each of which contains O1O2 SD vectors. Indicates the first SD vectors, and then indicates the cluster where the second SD vector is located through an indication message, and finally through or Indicates the SD vector selected in the cluster. However, the disadvantage of method 1 is that only the horizontal or vertical vectors in the cluster are used as candidate SD vectors, which limits the range of candidate SD vectors. In fact, both horizontal and vertical vectors can be used as candidate vectors.

[0144] Method 2: First, divide N1O1N2O2 SD vectors into N1N2 clusters, each cluster contains O1O2 SD vectors. UE can also divide N1O1N2O2 SD vectors into O1O2 orthogonal SD vector groups, each group contains N1N2 orthogonal SD vectors. Indicates the oversampling offset and then passes Indicate the SD vector group to which the first and second SD vectors belong, and then use Only the second SD vector is indicated. However, the disadvantage of the above method 2 is that the position of the first SD vectors in the cluster is not explicitly indicated, but is based on The indication information indicates implicitly, but the implicit indication may cause the first SD vectors selected to be not the best SD vector, thereby causing the performance of the selected codebook to be reduced.

[0145] In view of this, the embodiments of the present disclosure provide a communication method, device, system, storage medium and computer program product, which independently and hierarchically indicate each spatial domain vector selected by the terminal, or first indicate the cluster where all selected spatial domain vectors are located, and then respectively indicate which spatial domain vector in the corresponding cluster is the spatial domain vector selected by the terminal, so that the selection of the spatial domain vector can be indicated to the network device when the rank is greater than 4, which can help the network device select appropriate precoding to better communicate with the terminal, reduce interference between transmitted information, and enhance reception accuracy.

[0146] It should be noted that the spatial domain vector (spatialdomainvector) can also be called a spatial component vector, a beam vector, a spatial beam basis vector, a spatial basis vector, etc.

[0147] In some embodiments, each spatial vector corresponds to a transmit beam of a transmitting device. By way of example, the spatial vector may be, for example but not limited to, a column vector of a two-dimensional DFT matrix or a column vector of an oversampled two-dimensional DFT matrix, that is, the spatial basis vector may be a two-dimensional DFT vector. Two-dimensional DFT vectors can generally be used to describe a beam formed by superposition of a horizontal beam and a vertical beam. By way of example, the spatial basis vector may also be an eigenvector determined based on spatial statistical characteristics of a channel, and by way of example, may be an eigenvector obtained by performing singular value decomposition (SVD) on the spatial statistical covariance matrix of the channel. Of course, the present application is not limited thereto.

[0148] Precoding is a technology widely used in wireless communication systems. It combines the modulated symbol information stream and channel state information through matrix operations, transforms it into a data stream suitable for the current channel, and then sends it out through the antenna. One of its purposes is to process the data at the transmitting end to improve the performance of the system, including enhancing signal quality, reducing bit error rate and interference, etc.

[0149] Figure 2 FIG. 1 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. Figure 2 As shown, the embodiment of the present disclosure relates to a communication method performed by a communication system 100, and the method includes:

[0150] Step S201: the network device 102 sends a second message to the terminal 101.

[0151] In some embodiments, the terminal receives the second message. For example, the terminal 101 receives the second message sent by the network device 102.

[0152] In some embodiments, the second message is used to configure codebook parameters.

[0153] In some embodiments, the second message is used to indicate codebook parameter information.

[0154] In some embodiments, the name of the second message is not limited, and it may be, for example, a codebook configuration command, a codebook parameter indication, etc.

[0155] In some embodiments, the second message includes codebook parameter information, and optionally, the codebook parameter information includes but is not limited to N1 and N2. Wherein, N1 represents the number of antenna ports in the first dimension, and N2 represents the number of antenna ports in the second dimension. For example, the first dimension may be a horizontal dimension, and the second dimension may be a vertical dimension.

[0156] In some embodiments, the codebook parameter information is used by the terminal to select a spatial vector in combination with the estimated downlink channel information. For example, a spatial vector adapted to the current channel state is selected. Of course, the present disclosure also supports free selection of spatial vectors.

[0157] In some embodiments, the codebook parameter information is used by the terminal to determine the candidate spatial vector.

[0158] For example, the network device sends a second message to the terminal, the second message includes codebook parameter information, and the terminal receives the second message and obtains the codebook parameter information.

[0159] In some embodiments, step S201 may be omitted. Accordingly, the codebook parameter information may be specified by the protocol, or the codebook parameter information may be pre-stored on the terminal, or the terminal may obtain the codebook parameter information from other electronic devices, or the codebook parameter information may be default information.

[0160] Step S202: Terminal 101 performs channel estimation to obtain downlink channel information.

[0161] It should be explained that channel estimation refers to the process of estimating the model parameters of a hypothetical channel model from received data. The purpose of channel estimation is to minimize the uncertainty of the channel and obtain the channel parameters.

[0162] In some embodiments, channel estimation includes measuring CSI-RS. For example, the terminal measures at least one CSI-RS to obtain downlink channel information. The CSI-RS is configured and sent by the network device.

[0163] Step S203: Terminal 101 selects a spatial vector.

[0164] In some embodiments, the terminal selects a spatial vector according to estimated downlink channel information and codebook parameter information.

[0165] In some embodiments, the estimated downlink channel information includes but is not limited to a channel matrix, wherein the channel matrix describes the channel through which the signal passes during transmission and includes the characteristics and influence of the channel, and provides information about signal propagation, attenuation, and interference.

[0166] In some embodiments, the value of the rank of the channel matrix indicates the maximum number of streams with the minimum downlink channel coherence, and the maximum number of streams is related to the number of spatial vectors selected by the terminal. For example, the total number of spatial vectors selected by the terminal is less than or equal to the maximum number of streams.

[0167] It should be explained that rank can be regarded as the number of independent parallel channels on the transmission channel between the transceiver devices, that is, the number of relatively independent channels supported at the same time. In the multiple-input multiple-output (MIMO) scenario, the number of data streams actually used for transmission is called the number of layers. Since the orthogonality between data paths under different MIMO channels is different, it is necessary to consider the interference generated between data streams. When multiple antennas are used to transmit multiple codewords, it is necessary to determine the number of data streams (i.e., the number of layers) that can be sent simultaneously based on the rank of the spatial channel to reduce interference between information, increase reception accuracy, and improve information transmission capacity.

[0168] In some embodiments, the downlink channel information includes a channel matrix, and a value of a rank of the channel matrix is ​​determined. The rank of the channel matrix may be greater than 4.

[0169] In some embodiments, the Rank of the channel matrix may be less than or equal to 8.

[0170] In some embodiments, the terminal may select A spatial vector. Among them, is a round-up symbol, v represents the number of layers of transmitted data, v = Rank, or v <Rank。

[0171] In some embodiments, in some embodiments, the terminal selects L spatial domain vectors from the candidate spatial domain vectors, wherein the total number of candidate spatial domain vectors is N1O1N2O2, wherein N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor of the first dimension, and O2 represents the oversampling factor of the second dimension.

[0172] In some embodiments, when the rank of the channel matrix is ​​greater than 4, if v = Rank, then the terminal can select at least A spatial vector.

[0173] In some embodiments, when the rank of the channel matrix is ​​greater than 4 and less than or equal to 8, if v = Rank, the terminal can select at least Spatial vectors, at most A spatial vector.

[0174] Step S204 : the terminal 101 sends a first message to the network device 102 .

[0175] In some embodiments, the network device receives the first message. For example, the network device 102 receives the first message sent by the terminal 101.

[0176] In some embodiments, the first message is used to indicate the spatial vector selected by the terminal, that is, to indicate the spatial vector selected by the terminal.

[0177] In some embodiments, the first message is used to indicate the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4.

[0178] In some embodiments, the first message is used to indicate the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 and less than or equal to 8.

[0179] For example, the terminal sends a first message to the network device, the first message is used to indicate the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal through channel estimation, and the selected spatial vector is used by the network device to determine the precoding of downlink data transmission. Among them, "precoding" and "precoding matrix" can be replaced with each other.

[0180] In some embodiments, the terminal may place the first message in part 2 of the CSI and send it to the network device. For example, the terminal places the first message in a precoding matrix indication (PMI) in part 2 of the CSI and sends the CSI to the network device. The network device receives the CSI, obtains the first message in the PMI of part 2 of the CSI, and thereby learns the spatial vector selected by the terminal.

[0181] In some embodiments, the first message includes first information, and the first information is used to indicate a first spatial vector selected by the terminal from the first vector set; wherein the first vector set includes N1O1N2O2 candidate spatial vectors, and the length of the first information is bits, or the length of the first information is Bit.

[0182] In some embodiments, the name of the first information is not limited, and it may be, for example, a first indication, a first field, a first bit sequence, etc.

[0183] In some embodiments, the first spatial vector refers to the first spatial vector selected by the terminal. Alternatively, the first spatial vector refers to a spatial vector selected from N1O1N2O2 candidate spatial vectors. The name of the first spatial vector is not limited, and it can be, for example, a selected spatial vector, the first spatial vector, etc.

[0184] For example, assume that the network device is configured with two CSI-RS resources, each resource contains 32 ports for the terminal to estimate the downlink channel information, and configure N1 = 8, N2 = 4, that is, the total number of CSI-RS ports is 64. Assume that the oversampling factor O1 = O2 = 4. Assume that the rank of the channel matrix is ​​Rank = 6, and v = Rank = 6. Then, the terminal will select According to the configured codebook parameter information, the total number of candidate spatial vectors is N1O1N2O2=512. Further, the terminal can select the first spatial vector from the 512 candidate spatial vectors according to the estimated downlink channel information, and can select the first spatial vector by length The first information indicates which vector among the 512 candidate spatial domain vectors the selected first spatial domain vector is.

[0185] In some embodiments, in addition to the first information, the first message may also include i-th information, where the i-th information is used to indicate the i-th spatial domain vector selected by the terminal from the second vector set, where i is an integer greater than or equal to 2. Optionally,

[0186] Optionally, the second vector set is determined from the first vector set with reference to the first spatial domain vector, the candidate spatial domain vectors in the second vector set are orthogonal to the first spatial domain vector in at least one dimension (e.g., the first dimension and / or the second dimension), and the second vector set includes K1 candidate spatial domain vectors. Correspondingly, the length of the i-th information is Optionally, K1 = (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1).

[0187] For example, continue with the assumptions in the previous example, that is, assume that the network device is configured with two CSI-RS resources, each resource contains 32 ports for the terminal to estimate the downlink channel information, and configure N1 = 8, N2 = 4, that is, the total number of CSI-RS ports is 64. Assume that the oversampling factor O1 = O2 = 4. Assume that the rank of the channel matrix is ​​Rank = 6, that is, v = Rank = 6. Then, the terminal will select According to the configured codebook parameter information, the total number of candidate spatial vectors is N1O1N2O2=512. Furthermore, in the first vector set, there are (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)=187 candidate spatial vectors that are orthogonal to the first spatial vector (i.e., the first basis vector) in the horizontal dimension and / or vertical dimension. The terminal selects 2 spatial vectors from the 187 candidate spatial vectors according to the downlink channel information, and transmits them through two length The information of respectively indicates which of the two selected spatial domain vectors is which vector among the 187 candidate spatial domain vectors. From the first information, it can be known that the total length of the first message indicating the three selected spatial domain vectors is 9+2×8=25 bits.

[0188] In some other embodiments, the first message may include, in addition to the first information, jth indication information, where the jth indication information is used to indicate the jth spatial domain vector selected by the terminal from the jth vector set, where j is an integer greater than or equal to 2. Optionally,

[0189] This is a way to hierarchically determine the candidate vector set and hierarchically indicate each selected spatial domain vector. For example, the first spatial domain vector is first selected from all candidate spatial domain vectors (i.e., the first vector set). Then, based on the selected first spatial domain vector, X candidate spatial domain vectors for selecting the second spatial domain vector (i.e., the second vector set corresponding to j=2) are determined, and the terminal freely selects the second spatial domain vector (i.e., j=2) from the X candidate spatial domain vectors. Then, based on the selected second spatial domain vector, Y candidate spatial domain vectors for selecting the third spatial domain vector (i.e., the third vector set corresponding to j=3) are determined, and the terminal freely selects the third spatial domain vector (i.e., j=3) from the Y candidate spatial domain vectors. The terminal determines Z candidate spatial domain vectors for selecting the fourth spatial domain vector (i.e., the fourth vector set corresponding to j=4) based on the selected third spatial domain vector, and the terminal freely selects the fourth spatial domain vector (i.e., j=4) from the Z candidate spatial domain vectors.

[0190] Optionally, the j-th vector set is determined from the j-1-th vector set with reference to the j-1-th spatial domain vector, and the candidate spatial domain vectors in the j-th vector set are orthogonal to the j-1-th spatial domain vector in at least one dimension.

[0191] For example, first select the first spatial domain vector from the first vector set, i.e., N1O1N2O2 candidate spatial domain vectors, and then determine the candidate X=(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1) candidate spatial domain vectors based on the selected first spatial domain vector, and select the second spatial domain vector therefrom. Then determine at most (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-N2(O2-1)-1 candidate spatial domain vectors based on the selected second spatial domain vector, and select the third spatial domain vector therefrom. Finally, determine at most (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-2N2(O2-1)-2 candidate spatial domain vectors based on the selected third spatial domain vector, and select the fourth spatial domain vector therefrom.

[0192] Optionally, when j=2, the j-th vector set includes K1 candidate spatial domain vectors, and the length of the j-th indication information is Wherein, K1 can refer to the above-mentioned embodiment and will not be described in detail here.

[0193] Optionally, when j ≥ 3, the j-th vector set includes K2 candidate spatial domain vectors, and the length of the j-th indication information is bits, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

[0194] In some other embodiments, the first message may include, in addition to the first information, one second information and L-1 third information, wherein v represents the number of layers of transmitted data. Optionally, N1O1N2O2 candidate spatial domain vectors may be divided into N1N2 candidate clusters, and one candidate cluster includes O1O2 candidate spatial domain vectors.

[0195] The second information is used to indicate the L-1 clusters selected by the terminal from the N1N2 candidate clusters. The length of the second information is bits; a third information corresponds to a cluster selected by the terminal, used to indicate a spatial vector selected by the terminal from the candidate spatial vectors of the cluster, and the length of a third information is Bit.

[0196] Optionally, the first message further includes sixth information, the length of the sixth information is Bit, used to indicate the oversampling offset. The offset is used to determine N1N2 mutually orthogonal spatial vectors.

[0197] In some other embodiments, the first message may include, in addition to the first information, one second information and L-1 third information, wherein v represents the number of layers of transmitted data. Optionally, N1O1N2O2 candidate spatial domain vectors may be divided into O1O2 candidate groups, and one candidate group includes N1N2 candidate spatial domain vectors.

[0198] The second information is used to indicate the L-1 groups selected by the terminal from the O1O2 candidate clusters. The length of the second information is bits; a third information corresponds to a group selected by the terminal, used to indicate a spatial vector selected by the terminal from the candidate spatial vectors of the group, and the length of a third information is Bit.

[0199] In some embodiments, the first message may include one fourth information and L fifth information, wherein the fourth information is used to indicate the L clusters selected by the terminal from all candidate clusters. One fifth information corresponds to a cluster selected by the terminal, and is used to indicate a spatial vector selected by the terminal from the candidate spatial vectors of the cluster.

[0200] Optionally, the total number of candidate spatial domain vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial domain vectors. Accordingly, the length of the fourth information is bits, the length of a fifth message is Bit.

[0201] Optionally, the first message further includes sixth information, the length of the sixth information is Bit, used to indicate the oversampling offset, which is used to determine N1N2 mutually orthogonal spatial domain vectors.

[0202] For example, assume that the network device is configured with two CSI-RS resources, each resource contains 32 ports for the terminal to estimate the downlink channel information, and configure N1 = 8, N2 = 4, that is, the total number of CSI-RS ports is 64, and the oversampling factor is assumed to be O1 = O2 = 4. Assuming v = Rank = 6, the terminal will select According to the configured codebook parameter information, the total number of candidate spatial vectors is N1O1N2O2=512. Further, the N1O1N2O2 candidate spatial vectors are divided into N1N2=32 candidate clusters, each of which contains O1O2=16 candidate spatial vectors. The sixth information indicates the oversampling offset, which determines the candidate spatial vector group selected by the terminal. The fourth information indicates the clusters where all selected spatial domain vectors are located. Then, for each selected cluster, according to a length of at most The fifth information indicates the selected spatial vector in the cluster. It can be seen that the total length of the first message indicating the three selected spatial vectors is 4+13+3×3=26 bits. This is similar to the resource overhead of the aforementioned method of calculating the total length of the first message as 25 bits, and both can indicate the L spatial vectors selected by the terminal with less spatial vector indication overhead and keep the system performance unchanged.

[0203] Of course, in the above example, in addition to dividing N1O1N2O2 candidate spatial domain vectors into N1N2 candidate clusters, each candidate cluster contains O1O2 candidate spatial domain vectors, N1O1N2O2 candidate spatial domain vectors can also be divided into O1O2 orthogonal spatial domain vector groups, each group contains N1N2 orthogonal candidate spatial domain vectors. The rest of the calculation method is similar and will not be repeated here.

[0204] Step S205: The network device 102 determines the spatial vector selected by the terminal according to the first message.

[0205] In some embodiments, the network device determines the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message.

[0206] In some embodiments, an implementation method of determining, according to a first message, a spatial domain vector selected by a terminal when the rank of a channel matrix is ​​greater than 4 includes: determining, according to first information in the first message, a first spatial domain vector selected by the terminal from a first vector set; wherein the first vector set includes N1O1N2O2 candidate spatial domain vectors, and the length of the first information is bits, or the length of the first information is bits, where N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor in the first dimension, and O2 represents the oversampling factor in the second dimension. The symbol for rounding up.

[0207] In some embodiments, the implementation method of determining the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message further includes: determining the i-th spatial domain vector selected by the terminal from the second vector set according to the i-th information in the first message, where i is an integer greater than or equal to 2; wherein the second vector set is determined by the terminal from the first vector set with the first spatial domain vector as a reference, the candidate spatial domain vectors in the second vector set are orthogonal to the first spatial domain vector in at least one dimension, the second vector set includes K1 candidate spatial domain vectors, and the length of the i-th information is Optionally, K1 is calculated as follows: K1 = (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1).

[0208] In some other embodiments, the implementation method of determining the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message also includes: determining the jth spatial domain vector selected by the terminal from the jth vector set according to the jth indication information in the first message, where j is an integer greater than or equal to 2; wherein the jth vector set is determined by the terminal from the j-1th vector set with reference to the j-1th spatial domain vector, and the candidate spatial domain vectors in the jth vector set are orthogonal to the j-1th spatial domain vector in at least one dimension. Optionally, when j=2, the jth vector set includes K1 candidate spatial domain vectors, and the length of the jth indication information is Optionally, when j ≥ 3, the j-th vector set includes K2 candidate spatial domain vectors, and the length of the j-th indication information is bits, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

[0209] In some other embodiments, N1O1N2O2 candidate spatial domain vectors correspond to N1N2 candidate clusters, and one candidate cluster includes O1O2 candidate spatial domain vectors; the first message also includes a second information and L-1 third information, wherein v represents the number of layers of transmitted data, and a third information corresponds to a cluster selected by the terminal from N1N2 candidate clusters;

[0210] Accordingly, the implementation method of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message further includes: determining the L-1 clusters selected by the terminal from the N1N2 candidate clusters according to the second information, wherein the length of the second information is bit; determining a spatial vector selected by the terminal from the candidate spatial vectors of a corresponding cluster according to a third information, the length of a third information is Bit.

[0211] In some embodiments, the first message includes one fourth information and L fifth information, wherein v represents the number of layers of transmitted data. is a calculation symbol rounded up; accordingly, the implementation method of determining the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message includes: determining L clusters selected by the terminal from multiple candidate clusters according to the fourth information, and a fifth information corresponds to a cluster selected by the terminal; determining a spatial domain vector selected by the terminal from the candidate spatial domain vectors of a corresponding cluster according to the fifth information, wherein the fifth information corresponds to a cluster selected by the terminal. Optionally, the total number of candidate spatial domain vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and a candidate cluster includes O1O2 candidate spatial domain vectors; accordingly, the length of the fourth information is bits, the length of a fifth message is Bit.

[0212] In some embodiments, when N1O1N2O2 candidate spatial vectors are divided into multiple groups or multiple clusters, the implementation method of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message also includes: determining the oversampling offset according to the sixth information in the first message, wherein the length of the sixth information is Bit.

[0213] Step S206: The network device 102 determines precoding for downlink data transmission at least according to the spatial domain vector selected by the terminal.

[0214] In some embodiments, the network device may calculate the precoding for downlink data transmission based at least on the received first message and the structure W=W1W2 of the Type I SP CB.

[0215] In some embodiments, the network device may calculate the precoding of downlink data transmission according to the received co-phase indication information and the spatial domain vector selected by the terminal through W=W1W2.

[0216] The specific implementation method of the network device determining the precoding of downlink data transmission at least according to the spatial domain vector selected by the terminal can be found in the relevant technology and will not be repeated here.

[0217] In some embodiments, the names of information, etc. are not limited to the names recorded in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "code element", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0218] In some embodiments, the terms "codebook", "codeword", "precoding matrix" and the like can be interchangeable. For example, a codebook can be a collection of one or more codewords / precoding matrices.

[0219] In some embodiments, terms such as "uplink", "uplink", "physical uplink" can be interchangeable, and terms such as "downlink", "downlink", "physical downlink" can be interchangeable, and terms such as "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" can be interchangeable.

[0220] In some embodiments, terms such as "synchronization signal (SS)", "synchronization signal block (SSB)", "reference signal (RS)", "pilot", and "pilot signal" can be used interchangeably.

[0221] 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.

[0222] In some embodiments, "obtain", "obtain", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from high levels, obtaining by self-processing, autonomous implementation, etc.

[0223] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0224] In some embodiments, terms such as "certain", "preset", "preset", "set", "indicated", "some", "any", and "first" can be interchangeable, and "specific A", "preset A", "preset A", "set A", "indicated A", "some A", "any A", and "first A" can be interpreted as A pre-defined in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., and can also be interpreted as specific A, some A, any A, or first A, etc., but is not limited to this.

[0225] The communication method involved in the embodiment of the present disclosure may include at least one of steps S201 to S205. For example, step S204 may be implemented as an independent embodiment, and step S204 and step S205 may be implemented as independent embodiments, but are not limited thereto.

[0226] In some embodiments, any two steps in step S201 to step S205 can be exchanged in order or executed simultaneously. For example, step S201 and step S202 can be exchanged in order or executed simultaneously.

[0227] In some embodiments, steps S201 to S203 and step S205 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0228] In some embodiments, steps S201 to S203 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0229] In some embodiments, see Figure 2 Other optional implementations recorded before or after the corresponding description.

[0230] Figure 3A FIG. 1 is a flow chart of a communication method according to an embodiment of the present disclosure. Figure 3A As shown, the embodiment of the present disclosure relates to a communication method, which is executed by a terminal side. The method includes:

[0231] Step S3101, receiving the second message.

[0232] The optional implementation of step S3101 can be found in Figure 2 Optional implementations of step S201, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0233] In some embodiments, the terminal 101 receives the second message sent by the network device 102, but is not limited thereto and may also receive the second message sent by other entities.

[0234] In some embodiments, terminal 101 obtains a second message specified by the protocol.

[0235] In some embodiments, terminal 101 obtains the second message from an upper layer(s).

[0236] In some embodiments, terminal 101 performs processing to obtain the second message.

[0237] In some embodiments, step S3101 is omitted, and the terminal 101 autonomously implements the function indicated by the second message, or the above function is default or acquiescent.

[0238] Step S3102: perform channel estimation to obtain downlink channel information.

[0239] The optional implementation of step S3102 can be found in Figure 2 Optional implementations of step S202, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0240] Step S3103: Select a spatial domain vector according to the estimated downlink channel information and codebook parameter information.

[0241] The optional implementation of step S3103 can be found in Figure 2 Optional implementations of step S203, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0242] Step S3104: Send a first message according to the selected spatial vector.

[0243] The optional implementation of step S3104 can be found in Figure 2 Optional implementations of step S204, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0244] In some embodiments, the terminal 101 sends the first message to the network device 102, but is not limited thereto, and the first message may also be sent to other entities.

[0245] The communication method involved in the embodiment of the present disclosure may include at least one of step S3101 to step S3104. For example, step S3104 may be implemented as an independent embodiment, and step S3103 and step S3104 may be implemented as independent embodiments, but are not limited thereto.

[0246] In some embodiments, any two steps in step S3101 to step S3104 can be exchanged in order or executed simultaneously. For example, step S3101 and step S3102 can be exchanged in order or executed simultaneously.

[0247] In some embodiments, steps S3101 to S3103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0248] In some embodiments, step S3101 and step S3102 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0249] Figure 3B FIG. 1 is a flow chart of a communication method according to an embodiment of the present disclosure. Figure 3B As shown, the embodiment of the present disclosure relates to a communication method, which is executed by a terminal side. The method includes:

[0250] Step S3201: determine a first vector set according to codebook parameter information, and select a first spatial domain vector from the first vector set.

[0251] The optional implementation of step S3201 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementation of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0252] Step S3202: Determine a second vector set from the first vector set with the selected first spatial domain vector as a reference.

[0253] The optional implementation of step S3202 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementation of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0254] Step S3203, determining a second spatial domain vector, a third spatial domain vector, and a fourth spatial domain vector from the second vector set.

[0255] The optional implementation of step S3203 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementations of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0256] Step S3204: Generate and send a first message according to the selected first spatial vector, second spatial vector, third spatial vector, and fourth spatial vector.

[0257] The optional implementation of step S3204 can be found in Figure 2 Step S204, Figure 3A Optional implementations of step S3104, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0258] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3204. For example, step S3204 may be implemented as an independent embodiment, step S3201 and step S3204 may be implemented as independent embodiments, step S3203 and step S3204 may be implemented as independent embodiments, and step S3201, step S3203, and step S3204 may be implemented as independent embodiments, but are not limited thereto.

[0259] In some embodiments, any two steps in step S3201 to step S3204 can be exchanged in order or executed simultaneously. For example, step S3201 and step S3202 can be exchanged in order or executed simultaneously.

[0260] In some embodiments, steps S3201 to S3203 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0261] In some embodiments, step S3202 and step S3203 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0262] In the embodiment of the present disclosure, step S3201 can be Figure 3A Step S3101 can be combined with Figure 3A Step S3102 combination.

[0263] Figure 3C FIG. 1 is a flow chart of a communication method according to an embodiment of the present disclosure. Figure 3C As shown, the embodiment of the present disclosure relates to a communication method, which is executed by a terminal side. The method includes:

[0264] Step S3301: determine a first vector set according to codebook parameter information, and select a first spatial domain vector from the first vector set.

[0265] The optional implementation of step S3301 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementation of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0266] Step S3302: Taking the selected first spatial domain vector as a reference, a second vector set is determined from the first vector set, and a second spatial domain vector is selected from the second vector set.

[0267] The optional implementation of step S3302 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementations of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0268] Step S3303: Taking the selected second spatial domain vector as a reference, a third vector set is determined from the second vector set, and a third spatial domain vector is selected from the third vector set.

[0269] The optional implementation of step S3303 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementations of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0270] Step S3304: Taking the selected third spatial domain vector as a reference, a fourth vector set is determined from the third vector set, and a fourth spatial domain vector is selected from the fourth vector set.

[0271] The optional implementation of step S3304 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementations of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0272] The communication method involved in the embodiment of the present disclosure may include at least one of steps S3301 to S3304. For example, step S3301 may be implemented as an independent embodiment, step S3301 and step S3302 may be implemented as independent embodiments, and step S3301, step S3302, and step S3303 may be implemented as independent embodiments, but are not limited thereto.

[0273] In some embodiments, any two steps in step S3301 to step S3304 can be swapped in order or executed simultaneously.

[0274] In some embodiments, steps S3302 to S3304 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0275] In some embodiments, step S3303 and step S3304 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0276] In some embodiments, step S3304 is optional and may be omitted or replaced in different embodiments.

[0277] In the embodiment of the present disclosure, step S3301 can be Figure 3A Step S3101 can be combined with Figure 3A Steps S3301 to S3304 can be combined with Figure 3B combination of step S3204.

[0278] Figure 3D FIG. 1 is a flow chart of a communication method according to an embodiment of the present disclosure. Figure 3D As shown, the embodiment of the present disclosure relates to a communication method, which is executed by a terminal side. The method includes:

[0279] Step S3401: determine all candidate spatial domain vectors according to codebook parameter information, and divide all candidate spatial domain vectors into multiple candidate clusters.

[0280] The optional implementation of step S3401 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementations of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0281] Step S3402: Select L clusters from all candidate clusters.

[0282] The optional implementation of step S3402 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementations of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0283] Step S3403: Select a spatial vector from each selected cluster.

[0284] The optional implementation of step S3403 can be found in Figure 2 Step S203, step S204, Figure 3A Optional implementations of step S3103, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0285] Step S3404: Generate and send a first message according to the selected clusters and the selected spatial vectors in each selected cluster.

[0286] The optional implementation of step S3404 can be found in Figure 2 Step S204, Figure 3A Optional implementations of step S3104, and Figure 2 , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0287] The communication method involved in the embodiment of the present disclosure may include at least one of steps S3401 to S3404. For example, step S3401 may be implemented as an independent embodiment, step S3401 and step S3402 may be implemented as independent embodiments, and step S3401, step S3402, and step S3403 may be implemented as independent embodiments, but are not limited thereto.

[0288] In some embodiments, any two steps in step S3401 to step S3404 can be swapped in order or executed simultaneously.

[0289] In some embodiments, steps S3402 to S3404 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0290] In some embodiments, step S3403 and step S3404 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0291] In some embodiments, step S3404 is optional and may be omitted or replaced in different embodiments.

[0292] In the embodiment of the present disclosure, step S3401 can be Figure 3A Step S3101 can be combined with Figure 3A Step S3102 combination.

[0293] Figure 3E FIG. 1 is a flow chart of a communication method according to an embodiment of the present disclosure. Figure 3E As shown, the embodiment of the present disclosure relates to a communication method, which is executed by a terminal side. The method includes:

[0294] Step S3501, sending a first message to a network device, where the first message is used to indicate a spatial domain vector selected by a terminal when the rank of a channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal through channel estimation, and the spatial domain vector is used by the network device to determine precoding for downlink data transmission.

[0295] In the embodiment of the present disclosure, step S3501 can be Figure 3A Step S3501 can be combined with at least one of steps S3101 to S3103. Figure 3B Step S3501 can be combined with at least one of steps S3201 to S3203. Figure 3C Step S3501 can be combined with at least one of steps S3301 to S3304. Figure 3D A combination of at least one of steps S3401 to S3403.

[0296] Figure 4A FIG. 1 is a flow chart of a communication method according to an embodiment of the present disclosure. Figure 4A As shown, the embodiment of the present disclosure relates to a communication method, which is executed by a network device side, and the method includes:

[0297] Step S4101, sending a second message.

[0298] The optional implementation of step S4101 can be found in Figure 2 Optional implementations of step S201, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0299] In some embodiments, the network device 102 sends the second message to the terminal 101, but is not limited thereto and the second message may also be sent to other entities.

[0300] Step S4102, receiving a first message.

[0301] The optional implementation of step S4102 can be found in Figure 2 Optional implementations of step S204, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0302] In some embodiments, the network device 102 receives the first message sent by the terminal 101, but is not limited thereto and may also receive the first message sent by other entities.

[0303] In some embodiments, network device 102 obtains a first message specified by the protocol.

[0304] In some embodiments, the network device 102 obtains the first message from an upper layer(s).

[0305] In some embodiments, the network device 102 performs processing to obtain the first message.

[0306] In some embodiments, step S4102 is omitted, and the network device 102 autonomously implements the function indicated by the first message, or the above function is default or acquiescent.

[0307] Step S4103: determine the selected spatial domain vector according to the first message.

[0308] The optional implementation of step S4103 can be found in Figure 2 Optional implementations of step S205, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0309] Step S4104: determining precoding for downlink data transmission based at least on the selected spatial vector.

[0310] The optional implementation of step S4104 can be found in Figure 2 Optional implementations of step S206, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0311] The communication method involved in the embodiment of the present disclosure may include at least one of step S4101 to step S4104. For example, step S4102 may be implemented as an independent embodiment, step S4102 and step S4103 may be implemented as independent embodiments, and step S4102 to step S4104 may be implemented as independent embodiments, but are not limited thereto.

[0312] In some embodiments, any two steps in step S4101 to step S4104 can be exchanged in order or executed simultaneously. For example, step S4101 and step S4102 can be exchanged in order or executed simultaneously.

[0313] In some embodiments, step S4101, step S4103, and step S4104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0314] In some embodiments, step S4101 and step S4104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0315] In some embodiments, step S4101 is optional and may be omitted or replaced in different embodiments.

[0316] Figure 4B FIG. 1 is a flow chart of a communication method according to an embodiment of the present disclosure. Figure 4B As shown, the embodiment of the present disclosure relates to a communication method, which is executed by a network device side, and the method includes:

[0317] Step S4201, receiving a first message.

[0318] The optional implementation of step S4201 can be found in Figure 2 Step S204, Figure 4A Optional implementations of step S4102, and Figure 2 , Figure 4A Other related parts in the embodiments involved will not be described in detail here.

[0319] Step S4202: determine the selected spatial domain vector according to the first message.

[0320] The optional implementation of step S4202 can be found in Figure 2 Step S205, Figure 4A Optional implementations of step S4103, and Figure 2 , Figure 4A Other related parts in the embodiments involved will not be described in detail here.

[0321] Step S4203: determining precoding for downlink data transmission based at least on the selected spatial vector.

[0322] The optional implementation of step S4203 can be found in Figure 2 Step S206, Figure 4A Optional implementations of step S4104, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0323] The communication method involved in the embodiment of the present disclosure may include at least one of step S4201 to step S4203. For example, step S4202 may be implemented as an independent embodiment, and step S4202 and step S4203 may be implemented as independent embodiments, but are not limited thereto.

[0324] In some embodiments, any two steps in step S4201 to step S4203 can be swapped in order or executed simultaneously.

[0325] In some embodiments, step S4201 and step S4203 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0326] In some embodiments, step S4201 is optional and may be omitted or replaced in different embodiments.

[0327] Figure 5 FIG. 1 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. Figure 5 As shown, the embodiment of the present disclosure relates to a communication method, which is executed by a communication system 100. The method includes:

[0328] Step S501: The terminal sends a first message to a network device.

[0329] The optional implementation of step S501 can be found in Figure 2 Optional implementations of step S204, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0330] Step S502: The network device determines, according to the first message, a spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4.

[0331] The optional implementation of step S502 can be found in Figure 2 Optional implementations of step S205, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0332] Step S503: The network device determines precoding for downlink data transmission at least according to the selected spatial vector.

[0333] The optional implementation of step S503 can be found in Figure 2 Optional implementations of step S206, and Figure 2 Other related parts in the embodiments involved will not be described in detail here.

[0334] In some embodiments, the above method may include the method described in the aforementioned embodiments of the communication system side, terminal side, network device side, etc., which will not be repeated here.

[0335] In some embodiments, when Rank=5-8, the SD vector indication method of Type I SP CB is as follows: NW (network) configures codebook parameter information including at least N1 and N2. Then the UE determines the selected (i.e., selected) L SD vectors according to the configured codebook parameter information and the estimated downlink channel information, and then the UE puts the selected SD vector indication information in CSI part 2 and sends it to the NW through the method described in the following embodiment.

[0336] In some embodiments, assuming that the UE selects SD vectors, the maximum value of L is 4.

[0337] In embodiment 1, each SD vector is independently indicated by an SD vector indication information. The UE freely selects the first SD vector from N1O1N2O2 candidate spatial vectors and or The indication information indicates the first SD vector selected. The UE selects the remaining L-1 SD vectors from the remaining (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1) candidate SD vectors. The L SDvectors are mutually orthogonal and are respectively selected through The indication information indicates each of the selected L-1 SD vectors.

[0338] Embodiment 2, hierarchically indicates each selected SD vector, that is, first selects the first SD vector from all candidate SD vectors. Then, X candidate SD vectors for selecting the second SD vector are determined based on the selected first SD vector, and the UE selects the second SD vector from the X candidate SD vectors. Similarly, Y candidate SD vectors for selecting the third SD vector are determined based on the selected second SD vector, and the UE selects the third SD vector from the Y candidate SD vectors. Finally, the UE determines Z candidate SD vectors for selecting the fourth SD vector based on the selected third SD vector, and the UE selects the fourth SD vector from the Z candidate SD vectors.

[0339] For example, the first SD vector is selected from N1O1N2O2 SD vectors. Then, candidate (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1) SD vectors are determined based on the selected first one, and the second SD vector is selected therefrom. Then, at most (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)–N2(O2-1)-1 candidate SD vectors are determined based on the selected second SD vectors, and the third SD vectors are selected therefrom. Finally, at most (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-2N2(O2-1)-2 candidate SD vectors are determined based on the selected third SD vectors, and the fourth SD vector is selected therefrom.

[0340] For example, the first SD vector is still of size or The second SD vector is indicated by Indication information indicates; the third SD vector passes The fourth SD vector is indicated by The instructions for this are as follows.

[0341] In Example 3, the candidate N1O1N2O2 SD vectors are divided into N1N2 clusters, each of which contains O1O2 SD vectors. Indicates the oversampling offset, and then determines N1N2 mutually orthogonal SD vectors based on the offset. Then through Indicates the cluster where each SD vector belongs. Finally, Indicates the L SD vectors selected by the UE.

[0342] Optionally, the UE still freely selects the first SD vector from N1O1N2O2 and passes or The indication information indicates the first SDvector selected. Then, Indicates the cluster where L-1 SD vectors are located, and finally passes through Indicates the L-1 SD vectors selected by the UE.

[0343] Optionally, the NW may calculate a precoding / precoding matrix for downlink data transmission based at least on the received SD vectors indication information and the structure of the Type I SP CB.

[0344] In some embodiments, assume that the NW is configured with two CSI-RS resources, each resource contains 32 ports for the UE to estimate the downlink channel information, and the configured N1=8, N2=4, that is, the total number of CSI-RS ports is 64, and the oversampling factor O1=O2=4. Assuming that the UE transmits rank=6, that is, v=6, the UE will select SD vectors. According to the configured codebook parameters, the number of candidate SD vectors is N1O1N2O2=512. The UE first selects the first SD vector from the 512 SD vectors based on the estimated channel information and There are (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1) horizontal and / or vertical vectors orthogonal to the first SD vectors. Then the UE selects the remaining two SD vectors according to the downlink channel information and passes bits. The total overhead of indicating SD vectors is 9+2*8=25 bits. The UE sends the selected L SD vectors indication information to the NW, and the NW can calculate the precoding of the downlink data transmission through W=W1W2 according to the received common phase indication information.

[0345] In some embodiments, assume that the NW is configured with two CSI-RS resources, each resource contains 32 ports for the UE to estimate the downlink channel information, and the configured N1=8, N2=4, that is, the total number of CSI-RS ports is 64, and the oversampling factor O1=O2=4. Assuming that the UE transmits rank=6, that is, v=6, the UE will select SD vectors. According to the configured codebook parameters, the number of candidate SD vectors is N1O1N2O2=512. N1O1N2O2 SD vectors are divided into N1N2=32 clusters, each of which contains O1O2=16 SD vectors. The UE can also divide N1O1N2O2 SD vectors into O1O2 orthogonal SD vector groups, each of which contains N1N2 orthogonal SD vectors. Indicates the oversampling offset, which determines the SD vectors group selected by the UE. Then Indicates the cluster where each SDvector is located. In each cluster, at most Indication. The total overhead is 4+13+3*3=26 bits. The UE sends the selected L SD vectors indication information to the NW, and the NW can calculate the precoding of the downlink data transmission through W=W1W2 according to the received common phase indication information.

[0346] In the embodiments of the present disclosure, part or all of the steps and their optional implementations may be arbitrarily combined with part or all of the steps in other embodiments, or may be arbitrarily combined with optional implementations of other embodiments.

[0347] The embodiments of the present disclosure can indicate the L SD vectors selected by the UE with less SD vector indication overhead and keep the system performance unchanged.

[0348] The embodiments of the present disclosure also propose a device for implementing any of the above methods, for example, a device is proposed, the above device includes a unit or module for implementing each step performed by the terminal in any of the above methods. For another example, another device is also proposed, including a unit or module for implementing each step performed by a network device (such as an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0349] It should be understood that the division of the units or modules in the above device is only a division of logical functions, and in actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. In addition, the units or modules in the device can be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and instructions are stored in the memory. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory inside the device or a memory outside the device. Alternatively, the units or modules in the device 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 hardware circuits can be understood as one or more processors; for example, in one implementation, the above 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 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 a configuration file, so as to realize 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 a processor calling software, or in the form of a hardware circuit, or in part by a processor calling software, and the rest by a hardware circuit.

[0350] In the disclosed embodiment, the processor is a circuit with signal processing capability. In one implementation, the processor may be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which may be understood as a microprocessor), or a digital signal processor (DSP), etc.; in another implementation, the processor may realize 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 a processor as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and realizing the configuration of the hardware circuit may be understood as the process of the processor loading instructions to realize the functions of some or all of the above units or modules. In addition, it may also be a hardware circuit designed for artificial intelligence, which may 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.

[0351] Figure 6 is a schematic diagram of the structure of a terminal proposed according to an embodiment of the present disclosure. Figure 6 As shown, the terminal 600 may include: at least one of a transceiver module 601, a processing module 602, etc. In some embodiments, the transceiver module 601 is used to send a first message to a network device, wherein the first message is used to indicate the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal performing channel estimation, and the spatial vector is used by the network device to determine the precoding of downlink data transmission. Optionally, the transceiver module 601 is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S201, step S204, but not limited thereto) executed by the terminal 101 in any of the above methods, which will not be repeated here. Optionally, the processing module 602 is used to execute at least one of the other steps (for example, step S202, step S203, step S205, step S206, but not limited thereto) executed by the terminal 101 in any of the above methods, which will not be repeated here.

[0352] Figure 7 Schematic diagram of the structure of a network device according to an embodiment of the present disclosure. Figure 7 As shown, the network device 700 may include: at least one of a transceiver module 701, a processing module 702, etc. In some embodiments, the transceiver module 701 is used to receive a first message sent by a terminal. The processing module 702 is used to determine the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message, wherein the channel matrix is ​​obtained by the terminal performing channel estimation; and the precoding of downlink data transmission is determined at least according to the spatial vector. Optionally, the transceiver module 701 is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S201, step S204, but not limited thereto) executed by the network device 102 in any of the above methods, which will not be repeated here. Optionally, the processing module 702 is used to execute at least one of the other steps (for example, step S202, step S203, step S205, step S206, but not limited thereto) executed by the network device 102 in any of the above methods, which will not be repeated here.

[0353] In some embodiments, the transceiver module may include a sending module and / or a receiving module, and the sending module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0354] In some embodiments, the processing module can be a module or include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be replaced with the processor.

[0355] Fig. 8A 8100 is a schematic diagram of the structure of a communication device 8100 proposed according to an embodiment of the present disclosure. The communication device 8100 may be a network device (e.g., an access network device, a core network device, etc.), or a terminal (e.g., a user device, etc.), or a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. The communication device 8100 may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment.

[0356] like Fig. 8AAs shown, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and the communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute the program, and process the data of the program. Optionally, the communication device 8100 is used to execute any of the above methods. Optionally, one or more processors 8101 are used to call instructions so that the communication device 8100 executes any of the above methods.

[0357] In some embodiments, the communication device 8100 further includes one or more transceivers 8102. When the communication device 8100 includes one or more transceivers 8102, the transceiver 8102 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S201, step S204, but not limited thereto), and the processor 8101 performs at least one of the other steps (for example, step S202, step S203, step S205, step S206, but not limited thereto). In an optional embodiment, the transceiver may include a receiver and / or a transmitter, and the receiver and the transmitter may be separated or integrated together. Optionally, the terms such as transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, interface, etc. may be replaced with each other, the terms such as transmitter, transmitting unit, transmitter, transmitting circuit, etc. may be replaced with each other, and the terms such as receiver, receiving unit, receiver, receiving circuit, etc. may be replaced with each other.

[0358] In some embodiments, the communication device 8100 further includes one or more memories 8103 for storing data. Optionally, all or part of the memories 8103 may also be outside the communication device 8100. In an optional embodiment, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuit 8104 is connected to the memory 8103, and the interface circuit 8104 may be used to receive data from the memory 8103 or other devices, and may be used to send data to the memory 8103 or other devices. For example, the interface circuit 8104 may read the data stored in the memory 8103 and send the data to the processor 8101.

[0359] The communication device 8100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited thereto. Fig. 8AThe communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0360] Figure 8B 8200 according to an embodiment of the present disclosure. For the case where the communication device 8100 may be a chip or a chip system, please refer to Figure 8B The structure diagram of the chip 8200 is shown, but is not limited to this.

[0361] The chip 8200 includes one or more processors 8201. The chip 8200 is configured to execute any of the above methods.

[0362] In some embodiments, the chip 8200 further includes one or more interface circuits 8202. Optionally, the terms interface circuit, interface, transceiver pin, etc. can be interchangeable. In some embodiments, the chip 8200 further includes one or more memories 8203 for storing data. Optionally, all or part of the memory 8203 can be outside the chip 8200. Optionally, the interface circuit 8202 is connected to the memory 8203, and the interface circuit 8202 can be used to receive data from the memory 8203 or other devices, and the interface circuit 8202 can be used to send data to the memory 8203 or other devices. For example, the interface circuit 8202 can read the data stored in the memory 8203 and send the data to the processor 8201.

[0363] In some embodiments, the interface circuit 8202 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S201, step S204, but not limited thereto). The interface circuit 8202 performs the communication steps such as sending and / or receiving in the above method, for example, means that the interface circuit 8202 performs data interaction between the processor 8201, the chip 8200, the memory 8203 or the transceiver device. In some embodiments, the processor 8201 performs at least one of the other steps (for example, step S202, step S203, step S205, step S206, but not limited thereto).

[0364] The modules and / or devices described in the embodiments such as virtual devices, physical devices, chips, etc. can be combined or separated as needed. Optionally, some or all steps can also be performed by multiple modules and / or devices in collaboration, which is not limited here.

[0365] The present disclosure also proposes a storage medium, on which instructions are stored, and when the instructions are executed on the communication device 8100, the communication device 8100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited to this, and it can also be a storage medium readable by other devices. Optionally, the storage medium can be a non-transitory storage medium, but is not limited to this, and it can also be a temporary storage medium.

[0366] The present disclosure also proposes a program product, which, when executed by the communication device 8100, enables the communication device 8100 to execute any of the above methods. Optionally, the program product is a computer program product.

[0367] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to execute any one of the above methods.

Claims

1. A communication method, characterized in that: Executed by a terminal, the method includes: A first message is sent to a network device, where the first message is used to indicate a spatial domain vector selected by the terminal when the rank of a channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal through channel estimation, and the spatial domain vector is used by the network device to determine precoding for downlink data transmission.

2. The method according to claim 1, characterized in that: Before sending the first message to the network device, the method includes: receiving a second message sent by the network device, where the second message includes codebook parameter information; The spatial domain vector is selected according to the codebook parameter information and the estimated downlink channel information.

3. The method according to claim 1 or 2, characterized in that: The first message includes first information, where the first information is used to indicate a first spatial domain vector selected by the terminal from a first vector set; The first vector set includes N1O1N2O2 candidate spatial domain vectors, and the length of the first information is bits, or the length of the first information is bits, where N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor in the first dimension, and O2 represents the oversampling factor in the second dimension. The symbol for rounding up.

4. The method according to claim 3, characterized in that The first message further includes i-th information, where the i-th information is used to indicate an i-th spatial domain vector selected by the terminal from the second vector set, where i is an integer greater than or equal to 2; The second vector set is determined from the first vector set with reference to the first spatial vector, the candidate spatial vectors in the second vector set are orthogonal to the first spatial vector in at least one dimension, the second vector set includes K1 candidate spatial vectors, and the length of the i-th information is Bit.

5. The method according to claim 3, characterized in that: The first message further includes j-th indication information, where the j-th indication information is used to indicate a j-th spatial domain vector selected by the terminal from a j-th vector set, where j is an integer greater than or equal to 2; The j-th vector set is determined from the j-1-th vector set with reference to the j-1-th spatial domain vector, and the candidate spatial domain vectors in the j-th vector set are orthogonal to the j-1-th spatial domain vector in at least one dimension.

6. The method according to claim 5, characterized in that When j=2, the j-th vector set includes K1 candidate spatial domain vectors, and the length of the j-th indication information is Bit.

7. The method according to claim 4 or 6, characterized in that: K1 is calculated as follows: K1=(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1).

8. The method according to claim 5, characterized in that When j≥3, the j-th vector set includes K2 candidate spatial domain vectors, and the length of the j-th indication information is bits, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

9. The method according to claim 3, characterized in that: The N1O1N2O2 candidate spatial domain vectors correspond to N1N2 candidate clusters, and one candidate cluster includes O1O2 candidate spatial domain vectors; The first message also includes a second message and L-1 third messages, wherein v represents the number of layers of transmitted data; The second information is used to indicate the L-1 clusters selected by the terminal from the N1N2 candidate clusters. The length of the second information is Bit; A third information corresponds to a cluster selected by the terminal, and is used to indicate a spatial vector selected by the terminal from the candidate spatial vectors of the cluster. The length of the third information is Bit.

10. The method according to claim 1 or 2, characterized in that: The first message includes one fourth information and L fifth information, wherein v represents the number of layers of transmitted data. is the calculation symbol for rounding up; The fourth information is used to indicate L clusters selected by the terminal from the candidate clusters; A fifth information corresponds to a cluster selected by the terminal, and is used to indicate a spatial domain vector selected by the terminal from candidate spatial domain vectors of the cluster.

11. The method according to claim 10, characterized in that The total number of candidate spatial domain vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial domain vectors, wherein N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor of the first dimension, and O2 represents the oversampling factor of the second dimension; The length of the fourth information is bits, the length of the fifth information is Bit.

12. The method according to any one of claims 9 to 11, characterized in that: The first message also includes sixth information, the length of which is Bit used to indicate the oversampling offset.

13. A communication method, characterized in that: Executed by a network device, the method includes: receiving a first message sent by a terminal; Determining, according to the first message, a spatial domain vector selected by the terminal when a rank of a channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by performing channel estimation by the terminal; Precoding for downlink data transmission is determined at least according to the spatial domain vector selected by the terminal.

14. The method according to claim 13, characterized in that The method further comprises: A second message is sent to the terminal, where the second message includes codebook parameter information, where the codebook parameter information is used by the terminal to select the spatial domain vector in combination with the estimated downlink channel information.

15. The method according to claim 13 or 14, characterized in that The determining, according to the first message, a spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, comprises: Determine, according to the first information in the first message, a first spatial domain vector selected by the terminal from a first vector set; The first vector set includes N1O1N2O2 candidate spatial domain vectors, and the length of the first information is bits, or the length of the first information is bits, where N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor in the first dimension, and O2 represents the oversampling factor in the second dimension. The symbol for rounding up.

16. The method according to claim 15, characterized in that The determining, according to the first message, the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, further includes: Determine, according to the i-th information in the first message, the i-th spatial domain vector selected by the terminal from the second vector set, where i is an integer greater than or equal to 2; The second vector set is determined by the terminal from the first vector set with the first spatial vector as a reference, the candidate spatial vectors in the second vector set are orthogonal to the first spatial vector in at least one dimension, the second vector set includes K1 candidate spatial vectors, and the length of the i-th information is Bit.

17. The method according to claim 15, characterized in that The determining, according to the first message, the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, further includes: Determine, according to the jth indication information in the first message, the jth spatial domain vector selected by the terminal from the jth vector set, where j is an integer greater than or equal to 2; The j-th vector set is determined by the terminal from the j-1-th vector set with reference to the j-1-th spatial domain vector, and the candidate spatial domain vectors in the j-th vector set are orthogonal to the j-1-th spatial domain vector in at least one dimension.

18. The method according to claim 17, characterized in that When j=2, the j-th vector set includes K1 candidate spatial domain vectors, and the length of the j-th indication information is Bit.

19. The method according to claim 16 or 18, characterized in that K1 is calculated as follows: K1=(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1).

20. The method according to claim 17, characterized in that When j≥3, the j-th vector set includes K2 candidate spatial domain vectors, and the length of the j-th indication information is bits, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

21. The method according to claim 15, characterized in that The N1O1N2O2 candidate spatial domain vectors correspond to N1N2 candidate clusters, and one candidate cluster includes O1O2 candidate spatial domain vectors; The first message also includes a second message and L-1 third messages, wherein v represents the number of layers of transmitted data, and a third information corresponds to a cluster selected by the terminal from the N1N2 candidate clusters; The determining, according to the first message, the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, further includes: Determine the L-1 clusters selected by the terminal from the N1N2 candidate clusters according to the second information, and the length of the second information is Bit; Determine a spatial vector selected by the terminal from candidate spatial vectors of a corresponding cluster according to a third information, wherein the length of the third information is Bit.

22. The method according to claim 13 or 14, characterized in that The first message includes one fourth information and L fifth information, wherein v represents the number of layers of transmitted data. is the calculation symbol for rounding up; The determining, according to the first message, a spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, comprises: Determine, according to the fourth information, L clusters selected by the terminal from a plurality of candidate clusters, wherein one fifth information corresponds to one cluster selected by the terminal; The terminal determines, according to the fifth information, one of the spatial domain vectors selected from candidate spatial domain vectors of a corresponding cluster.

23. The method according to claim 22, characterized in that The total number of candidate spatial domain vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial domain vectors, wherein N1 represents the number of antenna ports in the first dimension, N2 represents the number of antenna ports in the second dimension, O1 represents the oversampling factor of the first dimension, and O2 represents the oversampling factor of the second dimension; The length of the fourth information is bits, the length of the fifth information is Bit.

24. The method according to any one of claims 21 to 23, characterized in that The determining, according to the first message, the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, further includes: The oversampling offset is determined according to the sixth information in the first message, wherein the length of the sixth information is Bit.

25. A terminal, characterized in that: include: A transceiver module is used to send a first message to a network device, wherein the first message is used to indicate the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, wherein the channel matrix is ​​obtained by the terminal performing channel estimation, and the spatial domain vector is used by the network device to determine the precoding of downlink data transmission.

26. A network device, characterized in that: include: A transceiver module, used for receiving a first message sent by a terminal; A processing module, used to determine the spatial domain vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 according to the first message, wherein the channel matrix is ​​obtained by the terminal performing channel estimation; and determine the precoding of downlink data transmission at least according to the spatial domain vector.

27. A communication device, characterized in that: include: one or more processors; A memory coupled to the processor, wherein executable instructions are stored in the memory, and when the executable instructions are executed by the processor, the communication method according to any one of claims 1 to 24 is executed.

28. A communication system, characterized in that: The invention comprises a terminal and a network device, wherein the terminal is configured to implement the communication method according to any one of claims 1 to 12, and the network device is configured to implement the communication method according to any one of claims 13 to 24.

29. A storage medium storing instructions, characterized in that: When the instruction is executed on a communication device, the communication device is caused to execute the communication method according to any one of claims 1 to 24.

30. A computer program product comprising a computer program and / or instructions, characterized in that When the computer program and / or the instructions are executed by a communication device, the communication method according to any one of claims 1 to 24 is implemented.

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