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

Abstract

The present disclosure relates to a communication method, device and system, and a storage medium and a computer program product. The communication method executed by a terminal comprises: sending a first message to a network device, wherein the first message is used for indicating spatial domain vectors selected by the terminal when the rank of a channel matrix is greater than 4, the channel matrix is obtained by means of the terminal performing channel estimation, and the spatial domain vectors are used for the network device to determine precoding for downlink data transmission. The communication method enables, when the rank is greater than 4, the indication of the selection of the spatial domain vectors to the network device, and thus can help the network device select appropriate precoding, thereby better communicating with the terminal, reducing interference between transmitted information and enhancing receiving accuracy.

Description

Communication methods, devices, systems, storage media and computer program products Technical Field

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

[0002] To improve system spectral efficiency or coverage, it is now supported to expand the number of transmitting antenna ports from 32 to 128, and it is also supported to use Type I and Type II port selection codebooks to implement Channel Status Information (CSI) feedback.

[0003] Summary of the Invention

[0004] This disclosure provides a communication method, device, system, storage medium, and computer program product.

[0005] According to a first aspect of the present disclosure, a communication method is proposed, executed by a terminal, the method comprising: sending a first message to a network device, the first message being used to indicate a spatial 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 vector is used by the network device to determine precoding for downlink data transmission.

[0006] According to a second aspect of the present disclosure, a communication method is provided, performed by a network device, the method comprising: receiving a first message sent by a terminal; determining, based on the first message, a spatial 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 determining, at least based on the spatial vector selected by the terminal, precoding for downlink data transmission.

[0007] According to a third aspect of the present disclosure, a terminal is provided, comprising: a transceiver module, configured to send a first message to a network device, the first message being configured to indicate a spatial 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 vector is used by the network device to determine the precoding for downlink data transmission.

[0008] According to a fourth aspect of the present disclosure, a network device is provided, 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 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 determining, at least based on the spatial vector selected by the terminal, precoding for downlink data transmission.

[0009] According to a fifth aspect of the present disclosure, a communication device is provided, comprising: one or more processors; and a memory coupled to the processors, the memory storing executable instructions that, when executed by the processors, cause the communication method described in the first or second aspect to be executed.

[0010] According to a sixth aspect of the present disclosure, a communication system is provided, 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.

[0011] According to a seventh aspect of the present disclosure, a storage medium is provided that stores instructions that, when executed on a communication device, cause the communication device to perform the communication method described in the first or second aspect.

[0012] According to an eighth aspect of the present disclosure, a computer program product is provided, including a computer program and / or instructions, which, when executed by a communication device, implement the communication method described in the first or second aspect.

[0013] By adopting the above-described technical solution of this disclosure, at least the following beneficial technical effects can be achieved:

[0014] The terminal sends a first message to the network device, indicating the spatial vector selected when the rank of the channel matrix is ​​greater than 4. 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 for downlink data transmission. This enables the terminal to indicate the spatial vector selection to the network device when the rank is greater than 4, helping the network device choose appropriate precoding for better communication with the terminal, reducing interference between transmitted information, and enhancing reception accuracy. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings required for the description of the embodiments are introduced below. The following drawings are only some embodiments of this disclosure and do not impose specific limitations on the protection scope of this disclosure.

[0016] Figure 1A is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure.

[0017] Figure 1B is a schematic diagram of a spatial vector orthogonal to a first spatial vector according to an embodiment of the present disclosure.

[0018] Figure 2 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

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

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

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

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

[0023] Figure 3E is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

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

[0025] Figure 4B is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0026] Figure 5 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0027] Figure 6 is a schematic diagram of the structure of a terminal according to an embodiment of the present disclosure.

[0028] Figure 7 is a schematic diagram of the structure of a network device according to an embodiment of the present disclosure.

[0029] Figure 8A is a schematic diagram of the structure of a communication device according to an embodiment of the present disclosure.

[0030] Figure 8B is a schematic diagram of the structure of a chip according to an embodiment of the present disclosure. Detailed Implementation

[0031] This disclosure provides a communication method, device, system, storage medium, and computer program product.

[0032] In a first aspect, embodiments of this disclosure propose 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 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.

[0033] In the above embodiments, the terminal indicates the selection of spatial vectors to the network device when the rank is greater than 4. This can help the network device select appropriate precoding to communicate better with the terminal, reduce interference between transmitted information, and enhance the terminal's reception accuracy.

[0034] In conjunction with some embodiments of the first aspect, in some embodiments, before sending the first message to the network device, the method includes: receiving a second message sent by the network device, the second message including codebook parameter information; and selecting the spatial vector based on the codebook parameter information and estimated downlink channel information.

[0035] In the above embodiments, 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. By further combining the codebook parameter information, the terminal can select the spatial vector that best matches the current channel state for reporting. This 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.

[0036] In conjunction with some embodiments of the first aspect, in some embodiments, the first message includes first information, which is used to instruct the terminal to select a first spatial vector from a first vector set;

[0037] 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 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 calculation symbol is for rounding up.

[0038] In the above embodiment, through a length of Bit or The first information of the bit can indicate any one of the horizontal and / or vertical spatial vectors selected from the N1O1N2O2 candidate spatial vectors, so that the selection range of the first spatial vector is unrestricted. 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, thereby helping the network to select a suitable precoding matrix to better serve the user.

[0039] In conjunction with some embodiments of the first aspect, in some embodiments, the first message further includes i-th information, the i-th information being used to indicate the terminal to select an i-th spatial vector from a second vector set, where i is an integer greater than or equal to 2;

[0040] 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.

[0041] In the above embodiment, multiple spatial vectors can be selected from the second vector set, and each vector can be processed by means of a length of [missing information]. The information is reported, a length of The information can explicitly indicate any spatial vector in the horizontal and / or vertical dimensions of the second vector set. Therefore, the selected spatial vector can be any spatial vector in the horizontal and / or vertical dimensions of the second vector set, making the selection range of the selected spatial vector unrestricted. The terminal can select and report a spatial vector that is more suitable for the current channel state information or freely choose a spatial vector. Furthermore, this method of independently indicating each selected spatial vector allows the network device to explicitly determine each spatial vector selected by the terminal, thereby improving the performance of the selected codebook and reducing the spatial vector indication overhead.

[0042] In conjunction with some embodiments of the first aspect, in some embodiments, the first message further includes j-th indication information, which is used to indicate the terminal to select the j-th spatial vector from the j-th vector set, where j is an integer greater than or equal to 2;

[0043] The j-th vector set is determined from the (j-1)-th vector set with reference to the (j-1)-th spatial vector, and the candidate spatial vectors in the j-th vector set are orthogonal to the (j-1)-th spatial vector in at least one dimension.

[0044] In the above embodiments, after determining the (j-1)th spatial vector, a candidate vector set for the j-th spatial vector can be determined, thus narrowing down the candidate range for the j-th spatial vector. This hierarchical method of determining each selected spatial vector can reduce the resource overhead of reporting the selected spatial vectors.

[0045] In conjunction with some embodiments of the first aspect, in some embodiments, when j = 2, the j-th vector set includes K1 candidate spatial vectors, and the length of the j-th indication information is... Bit.

[0046] In conjunction with some embodiments of the first aspect, in some embodiments, K1 is calculated as follows: K1=(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1).

[0047] In the above embodiments, the number of candidate spatial vectors included in the second vector set is specified.

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

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

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

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

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

[0053] A third piece of 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 that cluster, and the length of a third piece of information is [missing information]. Bit.

[0054] In the above embodiment, the N1O1N2O2 candidate spatial vectors can be divided into N1N2 candidate clusters, and each candidate cluster includes O1O2 candidate spatial vectors, which are then divided into clusters of length _____. The second information of the bits can indicate the cluster in which all the selected L-1 spatial vectors belong, and is respectively transmitted through a sequence of lengths of... The third bit information can indicate which specific spatial vector in the corresponding cluster one of the selected L-1 spatial vectors belongs to. This way of indicating each selected spatial vector allows network devices to explicitly determine each spatial vector selected by the terminal, thereby improving the performance of the selected codebook.

[0055] In conjunction with some embodiments of the first aspect, in some embodiments, the first message includes a fourth piece of information and L pieces of fifth information, wherein v represents the number of layers for transmitting data. The calculation symbol for rounding up;

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

[0057] A fifth piece of 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 that cluster.

[0058] In conjunction with some embodiments of the first aspect, in some embodiments, the total number of candidate spatial vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial vectors, 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.

[0059] The length of the fourth information is Bits, the length of one of the fifth pieces of information is Bit.

[0060] In the above embodiment, the N1O1N2O2 candidate spatial vectors can be divided into N1N2 candidate clusters, and each candidate cluster includes O1O2 candidate spatial vectors, which are then divided into clusters of length _____. The second information of the bits can indicate the cluster to which all L selected spatial vectors belong, and is respectively transmitted through a sequence of lengths of... The third bit information can indicate which specific spatial vector in the corresponding cluster each selected spatial vector represents. This way of indicating each selected spatial vector allows network devices to explicitly determine each spatial vector selected by the terminal, thereby improving the performance of the selected codebook.

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

[0062] In the above embodiment, through a length of The sixth bit information can indicate the oversampling offset, which helps network devices determine the spatial vector selected by the terminal.

[0063] Secondly, embodiments of this disclosure propose a communication method executed by a network device, the method comprising: receiving a first message sent by a terminal; determining, based on the first message, a spatial 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 determining, at least based on the spatial vector, a precoding method for downlink data transmission.

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

[0065] In conjunction with some embodiments of the second aspect, in some embodiments, determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message includes: determining the first spatial vector selected by the terminal from a first vector set based on the first information in the first message; 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 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 calculation symbol is for rounding up.

[0066] In conjunction with some embodiments of the second aspect, in some embodiments, determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: determining the i-th spatial vector selected by the terminal from a second vector set based on 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 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.

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

[0068] In conjunction with some embodiments of the second aspect, in some embodiments, when j = 2, the j-th vector set includes K1 candidate spatial 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 as follows: K1=(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1).

[0070] In conjunction with some embodiments of the second aspect, in some embodiments, when j≥3, the j-th vector set includes K2 candidate spatial vectors, and the length of the j-th indication information is... Bit, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

[0071] In conjunction with some embodiments of the second aspect, in some embodiments, the N1O1N2O2 candidate spatial vectors correspond to N1N2 candidate clusters, and one candidate cluster includes O1O2 candidate spatial vectors; the first message further includes a second piece of information and L-1 pieces of third information, wherein... v represents the layer number of data transmission, and one third piece of information corresponds to a cluster selected by the terminal from the N1N2 candidate clusters;

[0072] The step of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: determining L-1 clusters selected by the terminal from the N1N2 candidate clusters based on the second information, wherein the length of the second information is... Bit; Based on a third piece of information, the terminal selects a spatial vector from candidate spatial vectors corresponding to a cluster, wherein the length of the third piece of information is... Bit.

[0073] In conjunction with some embodiments of the second aspect, in some embodiments, the first message includes a fourth piece of information and L pieces of fifth information, wherein v represents the number of layers for transmitting data. The calculation symbol for rounding up;

[0074] The step 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 includes: determining L clusters selected by the terminal from multiple candidate clusters according to the fourth information, and a fifth piece of information corresponding to a cluster selected by the terminal; determining a spatial vector selected by the terminal from the candidate spatial vectors of a corresponding cluster according to a fifth piece of information, wherein a fifth piece of information corresponds to a cluster selected by the terminal.

[0075] In conjunction with some embodiments of the second aspect, in some embodiments, the total number of candidate spatial vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial vectors, 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 length of the fourth information is... Bits, the length of one of the fifth pieces of information is Bit.

[0076] In conjunction with some embodiments of the second aspect, in some embodiments, determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: determining the oversampling offset based on the sixth information in the first message, wherein the length of the sixth information is... Bit.

[0077] Thirdly, embodiments of this disclosure propose 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 of the first aspect.

[0078] Fourthly, embodiments of this disclosure propose a network device, which includes at least one of a transceiver module and a processing module; wherein the network device is used to perform an optional implementation of the second aspect.

[0079] Fifthly, embodiments of this disclosure provide a terminal, which includes one or more processors; wherein the terminal is used to execute an optional implementation of the first aspect.

[0080] In a sixth aspect, embodiments of this disclosure provide a network device comprising: one or more processors; wherein the network device is configured to perform an optional implementation of the second aspect.

[0081] In a seventh aspect, embodiments of this disclosure provide a communication system comprising: a terminal and a network device; wherein the terminal is configured to perform the method described in the optional implementation of the first aspect, and the network device is configured to perform the method described in the optional implementation of the second aspect.

[0082] Eighthly, embodiments of this disclosure provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the method as described in the optional implementations of the first and second aspects.

[0083] Ninthly, embodiments of this disclosure provide a program product that, when executed by a communication device, causes the communication device to perform the method as described in the optional implementations of the first and second aspects.

[0084] In a tenth aspect, embodiments of this disclosure provide a computer program that, when run on a computer, causes the computer to perform the methods described in alternative implementations of the first and second aspects.

[0085] Eleventhly, embodiments of this disclosure provide a chip or chip system. The chip or chip system includes processing circuitry configured to perform the methods described according to optional implementations of the first and second aspects above.

[0086] It is understood that the aforementioned 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 this disclosure. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0087] This disclosure provides a communication method, device, system, storage medium, and computer program product. In some embodiments, the terms "communication method" and "information processing method," "high-rank spatial vector indication method based on Type I codebook feedback," etc., can be used interchangeably; the terms "communication device" and "information processing device," "high-rank spatial vector indication device based on Type I codebook feedback," etc., can be used interchangeably; and the terms "communication system" and "information processing system," "high-rank spatial vector indication system based on Type I codebook feedback," etc., can be used interchangeably.

[0088] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular 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 particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0089] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0090] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0091] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0092] In the embodiments disclosed herein, "multiple" refers to two or more.

[0093] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0094] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (execute A regardless of B); in some embodiments, B (execute B regardless 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). The same applies when there are more branches such as A, B, C, etc.

[0095] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, C, etc.

[0096] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0097] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0098] In some embodiments, the terms “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “if…”, “if…”, etc., can be used interchangeably.

[0099] In some embodiments, the terms “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 used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0100] 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”, “circuit”, “network element”, “node”, “function”, “unit”, “section”, “system”, “network”, “chip”, “chip system”, “entity”, and “subject” can be used interchangeably.

[0101] In some embodiments, "network" can be interpreted as devices included in a network (e.g., access network devices, core network devices, etc.).

[0102] In some embodiments, the terms "access network device (AN device)," "radio access network device (RAN device)," "base station (BS)," "radio base station," "fixed station," "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," and "bandwidth part (BWP)" can be used interchangeably.

[0103] 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", and "client" can be used interchangeably.

[0104] In some embodiments, access network devices, core network devices, or network devices can be replaced by terminals. For example, embodiments of this disclosure can also be applied to structures where communication between access network devices, core network devices, or network devices and terminals is replaced by communication between multiple terminals (e.g., device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the structure can also be configured such that the terminal has all or part of the functions of the access network device. Furthermore, terms such as "uplink" and "downlink" can be replaced with terms corresponding to communication between terminals (e.g., "sidelink"). For example, uplink channel, downlink channel, etc., can be replaced with sidelink channel, and uplink link, downlink, etc., can be replaced with sidelink link.

[0105] 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, core network device, or network device may also be configured to have all or some of the functions of the terminal.

[0106] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0107] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0108] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0109] Figure 1A is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure. As shown in Figure 1A, the communication system 100 may include a terminal 101 and a network device 102.

[0110] In some embodiments, terminal 101 includes, but is not limited to, at least one of the following: mobile phone, wearable device, Internet of Things device, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home.

[0111] In some embodiments, network device 102 may include at least one of access network device and core network device.

[0112] Optionally, network device 102 is an access network device. Optionally, the access network device is, for example, a node or device that connects a terminal to a wireless network. The access network device may include at least one of the following in a 5G communication system: evolved Node B (eNB), next-generation evolved Node B (ng-eNB), next-generation Node B (gNB), node B (NB), home node B (HNB), home evolved node B (HeNB), radio backhaul device, radio network controller (RNC), base station controller (BSC), base transceiver station (BTS), base band unit (BBU), mobile switching center, base station in a 6G communication system, open RAN, cloud RAN, base station in other communication systems, and access node in a Wi-Fi system, but is not limited thereto.

[0113] In some embodiments, network device 102 is a base station. Optionally, a base station may be, for example, a macro base station, micro base station (also called a small station), relay station, access point, 5G base station or future base station, satellite, Transmitting and Receiving Point (TRP), Transmitting Point (TP), mobile switching center, or other equipment that performs base station functions in a communication system, etc., and this disclosure does not specifically limit this type of device. For ease of description, in all embodiments of this disclosure, the apparatus that provides wireless communication functions for terminal devices is collectively referred to as a network device or base station.

[0114] In some embodiments, network device 102 is a core network device. Optionally, the core network device can be a single device, including a first network element, a second network element, etc., or it can be multiple devices or a group of devices, each including all or part of the first network element, the second network element, etc. Network elements can be virtual or physical. The core network includes, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).

[0115] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within access network devices involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0116] In some embodiments, the access network device may be composed of a central unit (CU) and a distributed unit (DU). The CU may also be called a control unit. The CU-DU structure can separate the protocol layer of the access network device. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0117] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0118] The following embodiments of this disclosure can be applied to the communication system 100 shown in FIG1A, or to some of the main bodies, but are not limited thereto. The main bodies shown in FIG1A are illustrative. The communication system may include all or some of the main bodies in FIG1A, or it may include other main bodies outside of FIG1A. The number and form of each main body are arbitrary. Each main body may be physical or virtual. The connection relationship between the main bodies is illustrative. The main bodies may not be connected or may be connected. The connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0119] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0120] In some embodiments, to further improve system spectral efficiency or coverage, the number of transmit antenna ports has been expanded from 32 to 128, and CSI feedback using Type 1 and Type II codebooks is also supported. The total number of supported ports P CSI-RS is 48, 64 or 128, and the corresponding number of horizontal dimension ports N1 and vertical dimension ports N2 are shown in Table 1 below.

[0121] Table 1

[0122] In some embodiments, when Rank = 5 to 8, the Type I single panel codebook (SP CB) supports two schemes, Scheme A and Scheme B, as shown below.

[0123] For Rel-19 Type-I SP CB extraction with 48, 64, and 128 CSI-RS ports and RI (Rank Indication) = 5-8, the following schemes are supported:

[0124] Supports O1=O2 values ​​that are the same as RI=1-4;

[0125] Option A (based on Option 3 described in RAN1#116bis):

[0126] W1 structure: Freely choose the first SD basis vector, and freely choose the next 2 (RI=5-6) or 3 spatial domain (SD) basis vectors (RI=7-8) such that they are orthogonal in at least one dimension (horizontal or vertical).

[0127] For RI = 5-8, v layers are mapped to selected SD basis vectors that follow the traditional Rel-15 Type-I.

[0128] W2 structure: follows the traditional Rel-15 Type-I RI=5-8.

[0129] Option B (based on Option 2 described in RAN1#116bis):

[0130] W1 structure: For RI = v, independently choose different... There are 10 spatial (SD) basis vectors, where each SD basis vector is applied to two corresponding layers, following the conventional Rel-15 Type-I with RI = 5-8, but if v is odd, the last SD basis vector is applied to the isolated layer.

[0131] The SD basis vectors are freely chosen from a set of N1N2 orthogonal SD Discrete Fourier Transform (DFT) basis vectors by means of combination.

[0132] W2 Structure: For isolated layers, inter-polarization co-phasing is selected from {1, j, -1, -j}. For two layers sharing the same SD basis vectors, inter-polarization co-phasing between the two layers is selected from the following pair {(1, -1), (j, -j)} to achieve inter-layer orthogonality.

[0133] Rel-19 only supports scheme A (RI = 1 - 4 + RI = 5 - 8) and scheme B (RI = 1 - 4 + RI = 5 - 5).

[0134] In some embodiments, the Type I SP CB structure can be represented as W = W1W2, and the W1 and W2 structures of scheme A are shown below:

[0135] W1 structure: Select the first spatial basis vector (SD vector) from all candidate spatial vectors (SD vectors), and then select... There are 3 or 4 SD vectors, where v is the rank value. Each SD vector contains a horizontal vector and a vertical vector, and is calculated by multiplying the horizontal and vertical vectors using the Kronecker product. The horizontal and vertical vectors of the selected 3 or 4 SD vectors are orthogonal in at least one dimension, thus ensuring orthogonality among the SD vectors.

[0136] In some embodiments, as shown in FIG1B, b0 is the first SD vector selected by the UE. Then, with b0 as a reference, the SD vectors orthogonal to the horizontal and / or vertical dimension vectors of the first SD vector are the gray-filled parts in FIG1B. The total number of SD vectors (excluding b0) is (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1). Where O1 and O2 represent the oversampling factors of the horizontal and vertical dimension vectors, respectively.

[0137] In some embodiments, the SD vectors to layer v mapping method for Rel-15 Type I SP CB when Rank = v = 5~8 is used to map the UE's selected vectors to the v layer. Each SD vector is mapped onto the v layer.

[0138] In some embodiments, the W2 structure uses the same design method for the polarization co-phase factor of each layer as the traditional Rel-15 Type I SP CB when Rank = 5 to 8, i.e., some layers use the same co-phase factor, and some layers have a co-phase factor set to 1.

[0139] In some embodiments, the above-described Scheme A structure is adopted for Type I SP CB. When Rank = 5 to 8, it is necessary to indicate the 3 or 4 mutually orthogonal SD vectors selected by the UE. However, there is currently no method for indicating SD vectors when Rank > 4.

[0140] In some embodiments, a method for selecting two SD vectors is provided:

[0141] Method 1: Divide the candidate N1O1N2O2 SD vectors into N1N2 clusters, with each cluster containing O1O2 SD vectors. First, through... The bits indicate the first SD vector, then an indication message indicates the cluster where the second SD vector belongs, and finally... or bits indicates the selected SD vector within the cluster. However, the drawback of method 1 is that it only considers horizontal or vertical vectors within the cluster 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.

[0142] Method 2: First, divide the N1O1N2O2 SD vectors into N1N2 clusters, with each cluster containing O1O2 SD vectors. The UE can also divide the N1O1N2O2 SD vectors into O1O2 orthogonal SD vector groups, with each group containing N1N2 orthogonal SD vectors. bits indicate the offset of oversampling, and then through Indicate the SD vectors group containing the first and second SD vectors, then use... bits only indicate the second SD vector. However, the drawback of method 2 above is that the position of the first SD vectors within the cluster is not explicitly indicated, but rather based on... The indication information is implicit, but this implicit indication will cause the selected first SD vectors to be not the best SD vectors, which in turn will lead to a decrease in the performance of the selected codebook.

[0143] In view of this, embodiments of the present disclosure provide a communication method, device, system, storage medium, and computer program product that, by independently and hierarchically instructing each spatial vector selected by the terminal, or by first instructing the clusters in which all selected spatial vectors belong and then instructing which spatial vector within the corresponding cluster is the spatial vector selected by the terminal, can indicate the selection status of spatial vectors to the network device when the rank is greater than 4. This can help the network device select appropriate precoding for better communication with the terminal, reduce interference between transmitted information, and enhance reception accuracy.

[0144] It should be noted that a spatial domain vector can also be called a spatial component vector, beam vector, spatial beam basis vector, spatial basis vector, etc.

[0145] In some embodiments, each spatial vector corresponds to a transmit beam of the transmitting device. For example, the spatial vector can be, for example but not limited to, a column vector of a two-dimensional DFT matrix or an oversampled two-dimensional DFT matrix; that is, the spatial basis vector can be a two-dimensional DFT vector. Two-dimensional DFT vectors are typically used to describe a beam formed by the superposition of beams in the horizontal and vertical directions. For example, the spatial basis vector can also be an eigenvector determined based on the channel's spatial statistical characteristics; for example, it can be an eigenvector obtained by performing singular value decomposition (SVD) on the channel's spatial statistical covariance matrix. Of course, this application is not limited to these.

[0146] Precoding is a widely used technique in wireless communication systems. It combines modulated symbolic information streams with channel state information through matrix operations, transforming them into a data stream suitable for the current channel before transmission via antenna. One of its purposes is to process data at the transmitting end to improve system performance, including enhancing signal quality and reducing bit error rate and interference.

[0147] Figure 2 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 2, the embodiment of the present disclosure relates to a communication method executed by a communication system 100, the method including:

[0148] In step S201, network device 102 sends a second message to terminal 101.

[0149] In some embodiments, the terminal receives a second message. For example, terminal 101 receives a second message sent by network device 102.

[0150] In some embodiments, the second message is used to configure codebook parameters.

[0151] In some embodiments, the second message is used to indicate codebook parameter information.

[0152] 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.

[0153] In some embodiments, the second message includes codebook parameter information, which optionally includes, but is not limited to, N1 and N2. Here, 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 can be a horizontal dimension, and the second dimension can be a vertical dimension.

[0154] In some embodiments, codebook parameter information is used by the terminal to select a spatial vector in conjunction with estimated downlink channel information. For example, a spatial vector adapted to the current channel state is selected. Of course, this disclosure also supports the free selection of spatial vectors.

[0155] In some embodiments, codebook parameter information is used by the terminal to determine candidate spatial vectors.

[0156] For example, the network device sends a second message to the terminal, which includes codebook parameter information. The terminal receives the second message and obtains the codebook parameter information.

[0157] In some embodiments, step S201 can be omitted. Accordingly, the codebook parameter information can be specified by a protocol, or the codebook parameter information can be pre-stored on the terminal, or the terminal can obtain the codebook parameter information from other electronic devices, or the codebook parameter information can be default information.

[0158] In step S202, terminal 101 performs channel estimation to obtain downlink channel information.

[0159] 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 channel uncertainty and obtain channel parameters.

[0160] In some embodiments, channel estimation includes measuring the CSI-RS. For example, the terminal measures at least one CSI-RS to obtain downlink channel information. The CSI-RS is configured and transmitted by the network device.

[0161] In step S203, terminal 101 selects a spatial vector.

[0162] In some embodiments, the terminal selects a spatial vector based on the estimated downlink channel information and codebook parameter information.

[0163] In some embodiments, the estimated downlink channel information includes, but is not limited to, a channel matrix. The channel matrix describes the channels through which the signal passes during transmission and includes the characteristics and effects of those channels. The channel matrix provides information about signal propagation, attenuation, and interference.

[0164] In some embodiments, the rank of the channel matrix indicates the maximum number of flows with minimum downlink channel coherence, which 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 this maximum number of flows.

[0165] It should be explained that rank can be viewed as the number of independent parallel channels on the transmission path between transceiver devices, that is, the number of relatively independent channels supported simultaneously. In a 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 differs under different MIMO channels, interference between data streams needs to be considered. When using multiple antennas to transmit multiple codewords, the number of data streams (i.e., the number of layers) that can be transmitted simultaneously needs to be determined based on the rank of the spatial channel to reduce interference between information, increase reception accuracy, and improve information transmission capacity.

[0166] In some embodiments, downlink channel information includes a channel matrix, and the rank of the channel matrix is ​​determined. The rank of the channel matrix can be greater than 4.

[0167] In some embodiments, the Rank of the channel matrix may be less than or equal to 8.

[0168] In some embodiments, the terminal can select There are spatial vectors. Among them, The calculation symbol is for rounding up. v represents the number of layers in the data transmission, v = Rank, or v < Rank.

[0169] In some embodiments, the terminal selects L spatial vectors from the candidate spatial vectors, wherein the total number of candidate spatial vectors is N1O1N2O2, 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.

[0170] 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.

[0171] In some embodiments, when the rank of the channel matrix is ​​greater than 4 and less than or equal to 8, if v = Rank, then the terminal can select at least At most 10 spatial vectors A spatial vector.

[0172] In step S204, terminal 101 sends a first message to network device 102.

[0173] In some embodiments, the network device receives a first message. For example, network device 102 receives a first message sent by terminal 101.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] For example, the terminal sends a first message to the network device, which indicates the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4. 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 for downlink data transmission. Here, "precoding" and "precoding matrix" can be used interchangeably.

[0178] In some embodiments, the terminal may send the first message to the network device within part 2 of the CSI. For example, the terminal may place the first message within the Precoding Matrix Indication (PMI) in part 2 of the CSI and send the CSI to the network device. The network device receives the CSI, obtains the first message from the PMI in part 2 of the CSI, and thus learns the spatial vector selected by the terminal.

[0179] In some embodiments, the first message includes first information, which is used to indicate a first spatial vector selected by the terminal from a first vector set; wherein the first vector set includes N1O1N2O2 candidate spatial vectors, and the length of the first information is [missing information]. Bits, or the length of the first piece of information is Bit.

[0180] 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.

[0181] 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 may be, for example, the selected spatial vector, the first spatial vector, etc.

[0182] For example, suppose the network device is configured with two CSI-RS resources, each containing 32 ports for the terminal to estimate downlink channel information, and configured with N1 = 8 and N2 = 4, for a total of 64 CSI-RS ports. Assume the oversampling factors O1 = O2 = 4. Assume the rank of the channel matrix is ​​Rank = 6, and v = Rank = 6. Then, the terminal will select... There are 512 candidate spatial vectors. Based on the configured codebook parameters, the total number of candidate spatial vectors is N1O1N2O2 = 512. Further, based on the estimated downlink channel information, the terminal can first select a first spatial vector from the 512 candidate spatial vectors, and can then use a vector of length... The first information in the bits indicates which of the 512 candidate spatial vectors the first spatial vector to be selected is.

[0183] In some embodiments, in addition to the first information described above, the first message may also include i-th information, which is used to indicate the i-th spatial vector selected by the terminal from the second vector set, where i is an integer greater than or equal to 2. Optionally,

[0184] Optionally, 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 (e.g., the first dimension and / or the second dimension). The second vector set includes K1 candidate spatial vectors, and correspondingly, the length of the i-th information is... Bits. Optionally, K1 = (N1-1)N2O2 + N1O1(N2-1) - (N1-1)(N2-1).

[0185] For example, continuing with the assumptions from the previous example, that is, the network device is configured with two CSI-RS resources, each containing 32 ports for the terminal to estimate downlink channel information, and configured with N1 = 8 and N2 = 4, i.e., a total of 64 CSI-RS ports. Assume the oversampling factors O1 = O2 = 4. Assume the rank of the channel matrix is ​​Rank = 6, i.e., v = Rank = 6. Then, the terminal will select... There are 512 candidate spatial vectors. According to the configured codebook parameters, the total number of candidate spatial vectors is N1O1N2O2 = 512. Further, 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 both the horizontal and / or vertical dimensions. The terminal selects two spatial vectors from these 187 candidate spatial vectors based on the downlink channel information, and then uses two vectors of length ... The bits indicate which of the 187 candidate spatial vectors the two selected spatial vectors are. Combined with the aforementioned length... The first information of bits indicates that the total length of the first message indicating the three selected spatial vectors is 9 + 2 × 8 = 25 bits.

[0186] In other embodiments, in addition to the first information described above, the first message may also include j-th indication information, which instructs the terminal to select the j-th spatial vector from the j-th vector set, where j is an integer greater than or equal to 2. Optionally,

[0187] This is a hierarchical method for determining the candidate vector set and hierarchically indicating each selected spatial vector. For example, first, a first spatial vector is selected from all candidate spatial vectors (i.e., the first vector set). Next, based on the selected first spatial vector, X candidate spatial vectors (i.e., the second vector set corresponding to j=2) are determined for selecting the second spatial vector, and the terminal freely selects the second spatial vector (i.e., j=2) from the X candidate spatial vectors. Then, based on the selected second spatial vector, Y candidate spatial vectors (i.e., the third vector set corresponding to j=3) are determined for selecting the third spatial vector, and the terminal freely selects the third spatial vector (i.e., j=3) from the Y candidate spatial vectors. Finally, based on the selected third spatial vector, Z candidate spatial vectors (i.e., the fourth vector set corresponding to j=4) are determined for selecting the fourth spatial vector, and the terminal freely selects the fourth spatial vector (i.e., j=4) from the Z candidate spatial vectors.

[0188] Optionally, the j-th vector set is determined from the (j-1)-th vector set with reference to the (j-1)-th spatial vector, and the candidate spatial vectors in the j-th vector set are orthogonal to the (j-1)-th spatial vector in at least one dimension.

[0189] For example, first, a first spatial vector is freely selected from the first set of vectors, namely N1O1N2O2 candidate spatial vectors. Then, based on the selected first spatial vector, a candidate spatial vector X = (N1-1)N2O2 + N1O1(N2-1) - (N1-1)(N2-1) is determined, and a second spatial vector is freely selected from these. Next, based on the selected second spatial vector, at most (N1-1)N2O2 + N1O1(N2-1) - (N1-1)(N2-1) - N2(O2-1) - 1 candidate spatial vectors are determined, and a third spatial vector is freely selected from these. Finally, based on the selected third spatial vector, at most (N1-1)N2O2 + N1O1(N2-1) - (N1-1)(N2-1) - 2N2(O2-1) - 2 candidate spatial vectors are determined, and a fourth spatial vector is freely selected from these.

[0190] Optionally, when j = 2, the j-th vector set includes K1 candidate spatial vectors, and the length of the j-th indication information is... Bit position. K1 can be found in the aforementioned embodiments, and will not be repeated here.

[0191] Optionally, when j≥3, the j-th vector set includes K2 candidate spatial vectors, and the length of the j-th indication information is... Bit, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

[0192] In other embodiments, in addition to the first information described above, the first message may also include a second message and L-1 third messages, wherein... v represents the number of layers for transmitting data. Optionally, the N1O1N2O2 candidate spatial vectors can be divided into N1N2 candidate clusters, and each candidate cluster includes O1O2 candidate spatial vectors.

[0193] The second information is used to indicate to the terminal the L-1 clusters selected from the N1N2 candidate clusters, and the length of the second information is [missing information]. Bit; a third piece of 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 that cluster. The length of a third piece of information is... Bit.

[0194] Optionally, the first message may also include a sixth message, the length of which is... The bit indicates the offset of the oversampling. This offset is used to determine N1N2 mutually orthogonal spatial vectors.

[0195] In other embodiments, in addition to the first information described above, the first message may also include a second message and L-1 third messages, wherein... v represents the number of layers for transmitting data. Optionally, the N1O1N2O2 candidate spatial vectors can be divided into O1O2 candidate groups, and each candidate group includes N1N2 candidate spatial vectors.

[0196] The second information is used to instruct the terminal to select L-1 groups from the O1O2 candidate clusters, and the length of the second information is [missing information]. Bit; a third piece of 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 that group. The length of a third piece of information is... Bit.

[0197] In some embodiments, the first message may include a fourth message and L fifth messages, wherein the fourth message indicates the L clusters selected by the terminal from all candidate clusters. Each fifth message corresponds to a cluster selected by the terminal and indicates a spatial vector selected by the terminal from the candidate spatial vectors of that cluster.

[0198] Optionally, the total number of candidate spatial vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial vectors. Correspondingly, the length of the fourth information is... Bits, the length of a fifth piece of information is Bit.

[0199] Optionally, the first message may also include a sixth message, the length of which is... The bit indicates the oversampling offset, which is used to determine N1N2 mutually orthogonal spatial vectors.

[0200] For example, suppose the network device is configured with two CSI-RS resources, each containing 32 ports for the terminal to estimate downlink channel information, and configured with N1=8 and N2=4, i.e., a total of 64 CSI-RS ports. Assume the oversampling factors O1=O2=4. Assume v=Rank=6, the terminal will select... There are N1O1N2O2 = 512 spatial vectors. Based on the configured codebook parameters, the total number of candidate spatial vectors is N1O1N2O2 = 512. Further, these N1O1N2O2 candidate spatial vectors are divided into N1N2 = 32 candidate clusters, each containing O1O2 = 16 candidate spatial vectors. Then, through a length of... The sixth piece of information indicates the oversampling offset, which determines the candidate spatial vector group selected by the terminal. Then, through a length of... The fourth piece of information in the bits indicates the cluster in which all selected spatial vectors reside. Then, for each selected cluster, based on a length of at most... The fifth information in the bits indicates the selected spatial vector within the cluster. Therefore, the total length of the first message indicating the three selected spatial vectors is 4 + 13 + 3 × 3 = 26 bits. This is similar in resource overhead to the previously calculated method of 25 bits for the total length of the first message; both methods indicate the L selected spatial vectors by the terminal with less spatial vector indication overhead while maintaining consistent system performance.

[0201] Of course, in the above example, besides dividing the N1O1N2O2 candidate spatial vectors into N1N2 candidate clusters, each containing O1O2 candidate spatial vectors, the N1O1N2O2 candidate spatial vectors can also be divided into O1O2 orthogonal spatial vector groups, each containing N1N2 orthogonal candidate spatial vectors. The remaining calculation methods are similar and will not be elaborated here.

[0202] In step S205, network device 102 determines the spatial vector selected by the terminal based on the first message.

[0203] 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, based on a first message.

[0204] In some embodiments, determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message includes: determining the first spatial vector selected by the terminal from a first vector set based on first information in the first message; wherein the first vector set includes N1O1N2O2 candidate spatial vectors, and the length of the first information is [missing information]. Bits, or the length of the first piece of 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 calculation symbol is for rounding up.

[0205] In some embodiments, the implementation of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: determining the i-th spatial vector selected by the terminal from a second vector set based on 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 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... Bits. Optionally, K1 is calculated as follows: K1 = (N1-1)N2O2 + N1O1(N2-1) - (N1-1)(N2-1).

[0206] In other embodiments, the implementation of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: determining the j-th spatial vector selected by the terminal from the j-th vector set based on the j-th indication information in the first message, where j is an integer greater than or equal to 2; wherein 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 vector, and the candidate spatial vectors in the j-th vector set are orthogonal to the (j-1)-th spatial vector in at least one dimension. Optionally, when j = 2, the j-th vector set includes K1 candidate spatial vectors, and the length of the j-th indication information is... Bits. Optionally, when j≥3, the j-th vector set includes K2 candidate spatial vectors, and the length of the j-th indication information is... Bit, where K2≤(N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-(M-2)[N2(O2-1)-1].

[0207] In other embodiments, the N1O1N2O2 candidate spatial vectors correspond to N1N2 candidate clusters, and a candidate cluster includes O1O2 candidate spatial vectors; the first message also includes a second piece of information and L-1 pieces of third information, wherein... v represents the layer number of data transmission, and one third piece of information corresponds to a cluster selected by the terminal from N1N2 candidate clusters;

[0208] Accordingly, the implementation method for determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: determining L-1 clusters selected by the terminal from the N1N2 candidate clusters based on the second information, wherein the length of the second information is... Bit; Based on a third piece of information, the terminal selects a spatial vector from the candidate spatial vectors of a corresponding cluster. The length of this third piece of information is... Bit.

[0209] In some embodiments, the first message includes a fourth message and L fifth messages, wherein v represents the number of layers for transmitting data. The calculation symbol is for rounding up; correspondingly, the implementation method for determining the spatial 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, where one piece of fifth information corresponds to one cluster selected by the terminal; determining a spatial vector selected by the terminal from the candidate spatial vectors of the corresponding cluster according to one piece of fifth information, wherein one piece of fifth information corresponds to one cluster selected by the terminal. Optionally, the total number of candidate spatial vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial vectors; correspondingly, the length of the fourth information is... Bits, the length of a fifth piece of information is Bit.

[0210] In some embodiments, when dividing the N1O1N2O2 candidate spatial vectors into multiple groups or clusters, the implementation of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: determining the oversampling offset based on the sixth information in the first message, wherein the length of the sixth information is... Bit.

[0211] In step S206, network device 102 determines the precoding of downlink data transmission based at least on the spatial vector selected by the terminal.

[0212] In some embodiments, the network device can calculate the precoding for downlink data transmission based at least on the received first message and the structure W = W1W2 of Type I SP CB.

[0213] In some embodiments, the network device can calculate the precoding of downlink data transmission by W = W1W2 based on the received co-phase indication information and the spatial vector selected by the terminal.

[0214] For details on how network devices determine the precoding of downlink data transmission based on the spatial vector selected by the terminal, please refer to relevant technologies, which will not be elaborated here.

[0215] In some embodiments, the names of information, etc., are not limited to the names described in the embodiments. Terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0216] In some embodiments, the terms "codebook," "codeword," and "precoding matrix" can be used interchangeably. For example, a codebook can be a collection of one or more codewords / precoding matrices.

[0217] In some embodiments, the terms "uplink", "uplink", and "physical uplink" can be used interchangeably, as can the terms "downlink", "downlink", and "physical downlink", as well as the terms "sidelink", "sidelink", "sidelink communication", "sidelink communication", "direct connection", "direct link", "direct communication", and "direct link communication".

[0218] In some embodiments, the terms "synchronization signal (SS)," "synchronization signal block (SSB)," "reference signal (RS)," "pilot," and "pilot signal" can be used interchangeably.

[0219] In some embodiments, the terms "precoding", "precoder", "weight", "precoding weight", "quasi-co-location (QCL)", "transmission configuration indication (TCI) status", "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", and "panel" can be used interchangeably.

[0220] In some embodiments, “get,” “obtain,” “receive,” “transmit,” “bidirectional transmission,” and “send and / or receive” can be used interchangeably and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining through self-processing, or autonomous implementation, among other meanings.

[0221] In some embodiments, terms such as “send,” “transmit,” “report,” “distribute,” “transfer,” “bidirectional transmission,” “send and / or receive” can be used interchangeably.

[0222] In some embodiments, terms such as "certain," "preset," "default," "set," "indicated," "a certain," "any," and "first" can be used interchangeably. "Certain A," "preset A," "default A," "set A," "indicated A," "a certain A," "any A," and "first A" can be interpreted as A pre-defined in a protocol or the like, or as A obtained through setting, configuration, or instruction, or as specific A, a certain A, any A, or first A, but are not limited thereto.

[0223] The communication method involved in the embodiments of this disclosure may include at least one of steps S201 to S205. For example, step S204 may be implemented as a standalone embodiment, and steps S204 and S205 may be implemented as standalone embodiments, but are not limited thereto.

[0224] In some embodiments, the order of any two steps S201 to S205 can be interchanged or they can be performed simultaneously. For example, the order of steps S201 and S202 can be interchanged or they can be performed simultaneously.

[0225] In some embodiments, steps S201 to S203 and step S205 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0226] In some embodiments, steps S201 to S203 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0227] In some embodiments, other optional implementations described before or after the specification corresponding to FIG2 may be referred to.

[0228] Figure 3A is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 3A, the embodiment of the present disclosure relates to a communication method executed by a terminal side, the method including:

[0229] Step S3101: Receive the second message.

[0230] The optional implementation of step S3101 can be found in the optional implementation of step S201 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0231] In some embodiments, terminal 101 receives a second message sent by network device 102, but is not limited thereto; it may also receive a second message sent by other entities.

[0232] In some embodiments, terminal 101 obtains a second message defined by the protocol.

[0233] In some embodiments, terminal 101 obtains a second message from an upper layer(s).

[0234] In some embodiments, terminal 101 processes the data to obtain a second message.

[0235] In some embodiments, step S3101 is omitted, and terminal 101 autonomously implements the function indicated by the second message, or the above function is default or default.

[0236] Step S3102: Perform channel estimation to obtain downlink channel information.

[0237] The optional implementation of step S3102 can be found in the optional implementation of step S202 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0238] Step S3103: Select the spatial vector based on the estimated downlink channel information and codebook parameter information.

[0239] The optional implementation of step S3103 can be found in the optional implementation of step S203 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0240] Step S3104: Send the first message according to the selected spatial vector.

[0241] The optional implementation of step S3104 can be found in the optional implementation of step S204 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0242] In some embodiments, terminal 101 sends a first message to network device 102, but is not limited thereto; it may also send the first message to other entities.

[0243] The communication method involved in the embodiments of this disclosure may include at least one of steps S3101 to S3104. For example, step S3104 may be implemented as a standalone embodiment, and steps S3103 and S3104 may be implemented as standalone embodiments, but are not limited thereto.

[0244] In some embodiments, the order of any two steps S3101 to S3104 can be interchanged or they can be performed simultaneously. For example, the order of steps S3101 and S3102 can be interchanged or they can be performed simultaneously.

[0245] In some embodiments, steps S3101 to S3103 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0246] In some embodiments, steps S3101 and S3102 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0247] Figure 3B is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 3B, the embodiment of the present disclosure relates to a communication method executed by a terminal side, the method including:

[0248] Step S3201: Determine the first vector set based on the codebook parameter information, and select the first spatial vector from the first vector set.

[0249] The optional implementations of step S3201 can be found in steps S203 and S204 in Figure 2, the optional implementations of step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0250] Step S3202: Using the selected first spatial vector as a reference, determine the second vector set from the first vector set.

[0251] The optional implementations of step S3202 can be found in the optional implementations of steps S203 and S204 in Figure 2, step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0252] Step S3203: Determine the second spatial vector, the third spatial vector, and the fourth spatial vector from the second vector set.

[0253] The optional implementations of step S3203 can be found in the optional implementations of steps S203 and S204 in Figure 2, step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0254] Step S3204: Generate and send a first message based on the selected first spatial vector, second spatial vector, third spatial vector, and fourth spatial vector.

[0255] The optional implementation of step S3204 can be found in the optional implementation of step S204 in Figure 2, step S3104 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0256] The communication method involved in the embodiments of this disclosure may include at least one of steps S3201 to S3204. For example, step S3204 may be implemented as a standalone embodiment, steps S3201 and S3204 may be implemented as standalone embodiments, steps S3203 and S3204 may be implemented as standalone embodiments, and steps S3201, S3203, and S3204 may be implemented as standalone embodiments, but are not limited thereto.

[0257] In some embodiments, the order of any two steps S3201 to S3204 can be interchanged or they can be performed simultaneously. For example, the order of steps S3201 and S3202 can be interchanged or they can be performed simultaneously.

[0258] In some embodiments, steps S3201 to S3203 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0259] In some embodiments, steps S3202 and S3203 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0260] In this embodiment of the disclosure, step S3201 can be combined with step S3101 of FIG3A, and step S3201 can be combined with step S3102 of FIG3A.

[0261] Figure 3C is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 3C, the embodiment of the present disclosure relates to a communication method executed by a terminal side, the method including:

[0262] Step S3301: Determine the first vector set based on the codebook parameter information, and select the first spatial vector from the first vector set.

[0263] The optional implementations of step S3301 can be found in steps S203 and S204 in Figure 2, the optional implementations of step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0264] Step S3302: Using the selected first spatial vector as a reference, determine the second vector set from the first vector set, and select the second spatial vector from the second vector set.

[0265] The optional implementations of step S3302 can be found in steps S203 and S204 in Figure 2, the optional implementations of step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0266] Step S3303: Using the selected second spatial vector as a reference, determine the third vector set from the second vector set, and select the third spatial vector from the third vector set.

[0267] The optional implementation of step S3303 can be found in the optional implementations of steps S203 and S204 in Figure 2, step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0268] Step S3304: Using the selected third spatial vector as a reference, determine the fourth vector set from the third vector set, and select the fourth spatial vector from the fourth vector set.

[0269] The optional implementation of step S3304 can be found in the optional implementations of steps S203 and S204 in Figure 2, step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0270] The communication method involved in the embodiments of this disclosure may include at least one of steps S3301 to S3304. For example, step S3301 may be implemented as a standalone embodiment, steps S3301 and S3302 may be implemented as standalone embodiments, and steps S3301, S3302, and S3303 may be implemented as standalone embodiments, but are not limited thereto.

[0271] In some embodiments, the order of any two steps in steps S3301 to S3304 can be interchanged or they can be performed simultaneously.

[0272] In some embodiments, steps S3302 to S3304 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0273] In some embodiments, steps S3303 and S3304 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0274] In some embodiments, step S3304 is optional and may be omitted or replaced in different embodiments.

[0275] In this embodiment of the disclosure, step S3301 can be combined with step S3101 of FIG3A, and step S3301 can be combined with step S3102 of FIG3A. Steps S3301 to S3304 can be combined with step S3204 of FIG3B.

[0276] Figure 3D is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 3D, the embodiment of the present disclosure relates to a communication method executed by a terminal side, the method including:

[0277] Step S3401: Determine all candidate spatial vectors based on the codebook parameter information, and divide all candidate spatial vectors into multiple candidate clusters.

[0278] The optional implementations of step S3401 can be found in the optional implementations of steps S203 and S204 in Figure 2, step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0279] Step S3402: Select L clusters from all candidate clusters.

[0280] The optional implementations of step S3402 can be found in steps S203 and S204 in Figure 2, the optional implementations of step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0281] Step S3403: Select a spatial vector from each of the selected clusters.

[0282] The optional implementations of step S3403 can be found in the optional implementations of steps S203 and S204 in Figure 2, step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0283] Step S3404: Generate and send the first message based on the selected cluster and the selected spatial vector in each selected cluster.

[0284] The optional implementation of step S3404 can be found in the optional implementation of step S204 in Figure 2, step S3104 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0285] The communication method involved in the embodiments of this disclosure may include at least one of steps S3401 to S3404. For example, step S3401 may be implemented as a standalone embodiment, steps S3401 and S3402 may be implemented as standalone embodiments, and steps S3401, S3402, and S3403 may be implemented as standalone embodiments, but are not limited thereto.

[0286] In some embodiments, the order of any two steps in steps S3401 to S3404 can be interchanged or they can be performed simultaneously.

[0287] In some embodiments, steps S3402 to S3404 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0288] In some embodiments, steps S3403 and S3404 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0289] In some embodiments, step S3404 is optional and may be omitted or replaced in different embodiments.

[0290] In this embodiment of the disclosure, step S3401 can be combined with step S3101 of FIG3A, and step S3401 can be combined with step S3102 of FIG3A.

[0291] Figure 3E is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 3E, the embodiment of the present disclosure relates to a communication method executed by a terminal side, the method including:

[0292] Step S3501: Send 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. The channel matrix is ​​obtained by the terminal through channel estimation, and the spatial vector is used by the network device to determine the precoding of downlink data transmission.

[0293] In this embodiment of the disclosure, step S3501 can be combined with at least one of steps S3101 to S3103 in FIG3A. Step S3501 can be combined with at least one of steps S3201 to S3203 in FIG3B. Step S3501 can be combined with at least one of steps S3301 to S3304 in FIG3C. Step S3501 can be combined with at least one of steps S3401 to S3403 in FIG3D.

[0294] Figure 4A is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 4A, the embodiment of the present disclosure relates to a communication method executed by a network device, the method comprising:

[0295] Step S4101: Send the second message.

[0296] The optional implementation of step S4101 can be found in the optional implementation of step S201 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0297] In some embodiments, network device 102 sends a second message to terminal 101, but is not limited thereto; it may also send a second message to other entities.

[0298] Step S4102: Receive the first message.

[0299] The optional implementation of step S4102 can be found in the optional implementation of step S204 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0300] In some embodiments, network device 102 receives a first message sent by terminal 101, but is not limited thereto; it may also receive a first message sent by other entities.

[0301] In some embodiments, network device 102 obtains a first message defined by a protocol.

[0302] In some embodiments, network device 102 obtains a first message from an upper layer(s).

[0303] In some embodiments, network device 102 processes the information to obtain the first message.

[0304] 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 default.

[0305] Step S4103: Determine the selected spatial vector based on the first message.

[0306] The optional implementation of step S4103 can be found in the optional implementation of step S205 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0307] Step S4104: Determine the precoding for downlink data transmission based at least on the selected spatial vector.

[0308] The optional implementation of step S4104 can be found in the optional implementation of step S206 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0309] The communication method involved in the embodiments of this disclosure may include at least one of steps S4101 to S4104. For example, step S4102 may be implemented as a standalone embodiment, steps S4102 and S4103 may be implemented as standalone embodiments, and steps S4102 to S4104 may be implemented as standalone embodiments, but are not limited thereto.

[0310] In some embodiments, the order of any two steps S4101 to S4104 can be interchanged or they can be performed simultaneously. For example, the order of steps S4101 and S4102 can be interchanged or they can be performed simultaneously.

[0311] In some embodiments, steps S4101, S4103, and S4104 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0312] In some embodiments, steps S4101 and S4104 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0313] In some embodiments, step S4101 is optional and may be omitted or replaced in different embodiments.

[0314] Figure 4B is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 4B, the embodiment of the present disclosure relates to a communication method executed by a network device, the method including:

[0315] Step S4201: Receive the first message.

[0316] The optional implementation of step S4201 can be found in the optional implementation of step S204 in Figure 2, step S4102 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0317] Step S4202: Determine the selected spatial vector based on the first message.

[0318] The optional implementation of step S4202 can be found in the optional implementation of step S205 in Figure 2, step S4103 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0319] Step S4203: Determine the precoding for downlink data transmission based at least on the selected spatial vector.

[0320] The optional implementation of step S4203 can be found in step S206 of Figure 2, the optional implementation of step S4104 of Figure 4A, and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0321] The communication method involved in the embodiments of this disclosure may include at least one of steps S4201 to S4203. For example, step S4202 may be implemented as a standalone embodiment, and steps S4202 and S4203 may be implemented as standalone embodiments, but are not limited thereto.

[0322] In some embodiments, the order of any two steps in steps S4201 to S4203 can be interchanged or they can be performed simultaneously.

[0323] In some embodiments, steps S4201 and S4203 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0324] In some embodiments, step S4201 is optional and may be omitted or replaced in different embodiments.

[0325] Figure 5 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 5, the embodiment of the present disclosure relates to a communication method executed by a communication system 100, the method including:

[0326] Step S501: The terminal sends the first message to the network device.

[0327] The optional implementation of step S501 can be found in the optional implementation of step S204 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0328] In step S502, the network device determines the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4, based on the first message.

[0329] The optional implementation of step S502 can be found in the optional implementation of step S205 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0330] In step S503, the network device determines the precoding for downlink data transmission based at least on the selected spatial vector.

[0331] The optional implementation of step S503 can be found in the optional implementation of step S206 in Figure 2 and other related parts in the embodiments involved in Figure 2, which will not be repeated here.

[0332] In some embodiments, the above methods may include the methods described in the aforementioned embodiments on the communication system side, terminal side, network device side, etc., which will not be repeated here.

[0333] In some embodiments, when Rank = 5 to 8, the SD vector indication method for Type I SP CB is as follows: the NW (network) configures codebook parameter information including at least N1 and N2. Then, the UE determines the selected (i.e., chosen) L SD vectors based on the configured codebook parameter information and the estimated downlink channel information. Then, the UE sends the selected SD vector indication information to the NW in CSI part2 using the method described in the following embodiment.

[0334] In some embodiments, it is assumed that the UE selects There are SD vectors, and the maximum value of L is 4.

[0335] In Example 1, each SD vector is independently indicated by an SD vector indication message. The UE freely selects the first SD vector from N1O1N2O2 candidate spatial vectors, and then... bits or The bits indication information indicates the first selected SD vector. The UE then selects the remaining L-1 SD vectors from the remaining (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1) candidate SD vectors. These L SD vectors are mutually orthogonal and are processed separately. The bits indicator information indicates each of the selected L-1 SD vectors.

[0336] In Example 2, a hierarchical instruction is provided for each selected SD vector. First, the first SD vector is selected from all candidate SD vectors. Then, based on the selected first SD vector, X candidate SD vectors are determined for selecting the second SD vector, and the UE freely selects the second SD vector from these X candidate SD vectors. Similarly, based on the selected second SD vector, Y candidate SD vectors are determined for selecting the third SD vector, and the UE freely selects the third SD vector from these Y candidate SD vectors. Finally, based on the selected third SD vector, Z candidate SD vectors are determined for selecting the fourth SD vector, and the UE freely selects the fourth SD vector from these Z candidate SD vectors.

[0337] For example, first, freely select the first SD vector from N1O1N2O2 SD vectors. Then, based on the selected first SD vector, determine (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1) SD vectors as candidates, and freely select the second SD vector from them. Next, based on the selected second SD vector, determine at most (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)–N2(O2-1)-1 candidate SD vectors, and freely select the third SD vector from them. Finally, based on the selected third SD vector, determine at most (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1)-2N2(O2-1)-2 candidate SD vectors as the fourth SD vector.

[0338] For example, the first SD vector is still passed by size bits or The bits indicate the information; the second SD vector is through Bits indication information; the 3rd SD vector through The bits indicate the information; the 4th SD vector is through The bits indicate the information.

[0339] Example 3: The candidate N1O1N2O2 SD vectors are divided into N1N2 clusters, with each cluster containing O1O2 SD vectors. First, through... The bits indicate the oversampling offset, and N1N2 mutually orthogonal SD vectors are determined based on this offset. Then, through... This indicates the cluster where each SD vector belongs. Finally, it is processed separately... bits indicates the L SD vectors selected by the UE.

[0340] Optionally, the UE can still freely select the first SD vector from N1O1N2O2, and through bits or The bits indicator information indicates the selected first SD vector. Then, through... Indicate the clusters where the L-1 SD vectors are located, and finally pass them separately. bits indicate the L-1 SD vectors selected by the UE.

[0341] Optionally, the NW can calculate the 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.

[0342] In some embodiments, assume that the NW is configured with two CSI-RS resources, each containing 32 ports for the UE to estimate downlink channel information, and that N1 = 8 and N2 = 4, i.e., the total number of CSI-RS ports is 64, and the oversampling factors O1 = O2 = 4. Assuming the UE's transmission rank = 6, i.e., v = 6, then the UE will select... There are 512 SD vectors. According to the configured codebook parameters, the number of candidate SD vectors is N1O1N2O2 = 512. The UE selects the first SD vector from these 512 vectors based on the estimated channel information, and then... bits. The number of horizontal and / or vertical dimension vectors orthogonal to the first SD vectors is (N1-1)N2O2+N1O1(N2-1)-(N1-1)(N2-1). Then, the UE selects the remaining two SD vectors based on the downlink channel information and... The total overhead for indicating SD vectors is 9 + 2 * 8 = 25 bits. The UE sends the selected L SD vector indication information to the NW, and the NW then calculates the precoding for downlink data transmission based on the received common phase indication information using W = W1W2.

[0343] In some embodiments, assume that the NW is configured with two CSI-RS resources, each containing 32 ports for the UE to estimate downlink channel information, and that N1 = 8 and N2 = 4, i.e., the total number of CSI-RS ports is 64, and the oversampling factors O1 = O2 = 4. Assuming the UE's transmission rank = 6, i.e., v = 6, then the UE will select... There are N1O1N2O2 = 512 SD vectors. Based on the configured codebook parameters, the number of candidate SD vectors is N1O1N2O2 = 32. These N1O1N2O2 SD vectors are divided into N1N2 = 32 clusters, with each cluster containing O1O2 = 16 SD vectors. The UE can also further divide these N1O1N2O2 SD vectors into O1O2 orthogonal SD vector groups, with each group containing N1N2 orthogonal SD vectors. bits indicate the oversampling offset, which determines the group of SD vectors selected by the UE. Then via bits indicate the cluster where each SD vector resides. At most, a maximum of [number] bits are needed within each cluster. 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 then calculates the precoding for downlink data transmission based on the received common phase indication information using W = W1W2.

[0344] In the embodiments disclosed herein, some or all of the steps and their optional implementations may be arbitrarily combined with some or all of the steps in other embodiments, or may be arbitrarily combined with the optional implementations in other embodiments.

[0345] The embodiments of this disclosure can indicate the L SD vectors selected by the UE with less SD vector indication overhead, while keeping system performance unchanged.

[0346] This disclosure also provides an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Alternatively, another apparatus is provided that includes units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods.

[0347] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC). The functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD). Taking a field-programmable gate array (FPGA) as an example, it can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0348] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using 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 configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0349] Figure 6 is a schematic diagram of the structure of a terminal according to an embodiment of the present disclosure. As shown in Figure 6, 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, the first message being 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 for downlink data transmission. Optionally, the transceiver module 601 is used to perform at least one of the communication steps (e.g., steps S201, S204, but not limited thereto) performed by the terminal 101 in any of the above methods, which will not be described in detail here. Optionally, the processing module 602 is used to perform at least one of the other steps (e.g., steps S202, S203, S205, S206, but not limited thereto) performed by the terminal 101 in any of the above methods, which will not be described in detail here.

[0350] Figure 7 is a schematic diagram of the structure of a network device according to an embodiment of the present disclosure. As shown in Figure 7, 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, based on the first message, 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 to determine, at least based on the spatial vector, the precoding for downlink data transmission. Optionally, the transceiver module 701 is used to perform at least one of the communication steps (e.g., steps S201, S204, but not limited thereto) performed by the network device 102 in any of the above methods, which will not be described in detail here. Optionally, the processing module 702 is used to perform at least one of the other steps (e.g., steps S202, S203, S205, S206, but not limited thereto) performed by the network device 102 in any of the above methods, which will not be described in detail here.

[0351] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, which may be separate or integrated. Optionally, the transceiver module may be interchangeable with a transceiver.

[0352] In some embodiments, the processing module may be a single module or may include multiple sub-modules. Optionally, the multiple sub-modules may each perform all or part of the steps required by the processing module. Optionally, the processing module may be interchangeable with a processor.

[0353] Figure 8A is a schematic diagram of the structure of a communication device 8100 according to an embodiment of this disclosure. The communication device 8100 can be a network device (e.g., access network device, core network device, etc.), a terminal (e.g., user equipment, etc.), a chip, chip system, or processor that supports the network device in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above methods. The communication device 8100 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0354] As shown in Figure 8A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. Optionally, the communication device 8100 can be used to execute any of the above methods. Optionally, one or more processors 8101 can be used to invoke instructions to cause the communication device 8100 to execute any of the above methods.

[0355] In some embodiments, the communication device 8100 further includes one or more transceivers 8102. When the communication device 8100 includes one or more transceivers 8102, the transceiver 8102 performs at least one of the communication steps (e.g., steps S201, S204, but not limited thereto) in the above method, such as sending and / or receiving, while the processor 8101 performs at least one of other steps (e.g., steps S202, S203, S205, S206, but not limited thereto). In optional embodiments, the transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, interface, etc., can be used interchangeably; the terms transmitter, sending unit, transmitter, sending circuit, etc., can be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., can be used interchangeably.

[0356] 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 be located outside the communication device 8100. In optional embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuits 8104 are connected to the memories 8103, and the interface circuits 8104 can be used to receive data from the memories 8103 or other devices, and can be used to send data to the memories 8103 or other devices. For example, the interface circuits 8104 can read data stored in the memories 8103 and send the data to the processor 8101.

[0357] 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 this disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG8A. The communication device may be a standalone device or may be part of a larger device. For example, the communication device may be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally, the IC collection may also include storage components 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, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0358] Figure 8B is a schematic diagram of the structure of chip 8200 according to an embodiment of the present disclosure. For cases where the communication device 8100 can be a chip or a chip system, the schematic diagram of chip 8200 shown in Figure 8B can be referenced, but is not limited thereto.

[0359] Chip 8200 includes one or more processors 8201. Chip 8200 is used to perform any of the methods described above.

[0360] In some embodiments, chip 8200 further includes one or more interface circuits 8202. Optionally, terms such as interface circuit, interface, and transceiver pin can be used interchangeably. In some embodiments, chip 8200 further includes one or more memories 8203 for storing data. Optionally, all or part of the memories 8203 may be located outside of chip 8200. Optionally, interface circuit 8202 is connected to memory 8203, and interface circuit 8202 can be used to receive data from memory 8203 or other devices, and interface circuit 8202 can be used to send data to memory 8203 or other devices. For example, interface circuit 8202 can read data stored in memory 8203 and send the data to processor 8201.

[0361] In some embodiments, the interface circuit 8202 performs at least one of the communication steps (e.g., steps S201, S204, but not limited thereto) in the above-described method, such as sending and / or receiving. For example, the interface circuit 8202 performing the communication steps (e.g., sending and / or receiving) in the above-described method refers to the interface circuit 8202 performing 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 other steps (e.g., steps S202, S203, S205, S206, but not limited thereto).

[0362] The modules and / or devices described in the various embodiments, such as virtual devices, physical devices, and chips, can be combined or separated arbitrarily as needed. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0363] This disclosure also proposes a storage medium storing instructions that, when executed on a communication device 8100, cause the communication device 8100 to perform 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 not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0364] This disclosure also provides a program product that, when executed by the communication device 8100, causes the communication device 8100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0365] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A communication method, characterized in that, The method, executed by a terminal, includes: A first message is sent to the network device, the first message being 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.

2. The method according to claim 1, characterized in that, Before sending the first message to the network device, including: Receive a second message sent by the network device, the second message including codebook parameter information; The spatial vector is selected based on 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, which is used to instruct the terminal to select a first spatial vector from a first vector set; 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 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 calculation symbol is for rounding up.

4. The method according to claim 3, characterized in that, The first message also includes the i-th information, which is used to indicate the i-th spatial 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 also includes j-th indication information, which is used to indicate the terminal to select the j-th spatial vector from the j-th vector set, where j is an integer greater than or equal to 2; Wherein, the j-th vector set is determined from the (j-1)-th vector set with reference to the (j-1)-th spatial vector. The candidate spatial vectors in the j-th vector set are orthogonal to the (j-1)-th spatial 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 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 vectors, and the length of the j-th indication information is... Bit, 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 vectors correspond to N1N2 candidate clusters, and a candidate cluster includes O1O2 candidate spatial vectors; The first message also includes a second message and L-1 third messages, wherein v represents the number of layers for transmitting data; The second information is used to indicate to the terminal the L-1 clusters selected from the N1N2 candidate clusters, and the length of the second information is Bit; A third piece of 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 that cluster, and the length of a third piece of information is [missing information]. Bit.

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

11. The method according to claim 10, characterized in that, The total number of candidate spatial vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial vectors, 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 length of the fourth information is Bits, the length of one of the fifth pieces of information is Bit.

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

13. A communication method, characterized in that, Performed by a network device, the method includes: The first message sent by the receiving terminal; The spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 is determined based on the first message, wherein the channel matrix is ​​obtained by the terminal through channel estimation; The precoding of downlink data transmission is determined at least based on the spatial vector selected by the terminal.

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

15. The method according to claim 13 or 14, characterized in that, Determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message includes: The first spatial vector selected by the terminal from the first vector set is determined based on the first information in the first message; 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 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 calculation symbol is for rounding up.

16. The method according to claim 15, characterized in that, The step of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: The terminal selects the i-th spatial vector from the second vector set based on the i-th information in the first message, 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 step of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message further includes: The j-th spatial vector selected by the terminal from the j-th vector set is determined based on the j-th indication information in the first message, 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 the (j-1)-th spatial vector as a reference, and the candidate spatial vectors in the j-th vector set are orthogonal to the (j-1)-th spatial 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 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 vectors, and the length of the j-th indication information is... Bit, 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 vectors correspond to N1N2 candidate clusters, and a candidate cluster includes O1O2 candidate spatial vectors; The first message also includes a second message and L-1 third messages, wherein v represents the layer number of data transmission, and one third piece of information corresponds to a cluster selected by the terminal from the N1N2 candidate clusters; The step of determining the spatial vector selected by the terminal when the rank of the channel matrix is ​​greater than 4 based on the first message. Also includes: Based on the second information, the terminal determines L-1 clusters selected from the N1N2 candidate clusters, where the length of the second information is [missing information]. Bit; The terminal determines a spatial vector selected from candidate spatial vectors of a corresponding cluster based on a third piece of information, wherein the length of the third piece of information is [missing information]. Bit.

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

23. The method according to claim 22, characterized in that, The total number of candidate spatial vectors is N1O1N2O2, the total number of candidate clusters is N1N2, and one candidate cluster includes O1O2 candidate spatial vectors, 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 length of the fourth information is Bits, the length of one of the fifth pieces of information is Bit.

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

25. A terminal, characterized in that, include: The transceiver module is used to send 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. The channel matrix is ​​obtained by the terminal through channel estimation, and the spatial vector is used by the network device to determine the precoding of downlink data transmission.

26. A network device, characterized in that, include: The transceiver module is used to receive the first message sent by the terminal; The processing module is configured to determine, based on the first message, 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 to determine, at least based on the spatial vector, the precoding for downlink data transmission.

27. A communication device, characterized in that, include: One or more processors; A memory coupled to the processor, the memory storing executable instructions, which, when executed by the processor, cause the communication method of any one of claims 1-24 to be executed.

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

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

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

Images