Communication method, communication device, storage medium, and program product

Abstract

The present disclosure relates to a communication method, a communication device, a storage medium, and a program product. The communication method comprises: a terminal sends a first message to a network device, the first message being used for indicating a spatial domain vector selected by the terminal when the number of antenna ports of a first dimension in codebook parameter information configured by the network device is 1, and the spatial domain vector being used by the network device to determine precoding of downlink data transmission. According to the present disclosure, a spatial domain vector selected by a terminal can be indicated using less indication overhead, and feedback overhead of the terminal can be reduced while system performance remains unchanged.

Description

Communication methods, communication equipment, storage media and software products Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a communication method, communication device, storage medium, and 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 codebooks to implement Channel Status Information (CSI) feedback. Summary of the Invention

[0003] This disclosure provides a communication method, communication device, storage medium, and program product.

[0004] 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 number of antenna ports in a first dimension of codebook parameter information configured by the network device is 1, the spatial vector being used by the network device to determine precoding for downlink data transmission.

[0005] According to a second aspect of the present disclosure, a communication method is proposed, 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 number of antenna ports in a first dimension of codebook parameter information configured by the network device is 1; and determining precoding for downlink data transmission based on the spatial vector selected by the terminal.

[0006] 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 number of antenna ports in a first dimension of codebook parameter information configured by the network device is 1, the spatial vector being used by the network device to determine precoding for downlink data transmission.

[0007] 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; and a processing module for determining, based on the first message, a spatial vector selected by the terminal when the number of antenna ports in the first dimension of codebook parameter information configured by the network device is 1; and determining precoding for downlink data transmission based on the spatial vector selected by the terminal.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] According to an eighth aspect of the present disclosure, a program product is provided, including at least one of a program and instructions, wherein the program and instructions, when executed by a communication device, implement the communication method described in the first or second aspect.

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

[0013] The terminal sends a first message to the network device, indicating the spatial vector selected by the terminal when the number of antenna ports in the first dimension of the codebook parameters configured by the network device is 1. This selected spatial vector is used by the network device to determine the precoding for downlink data transmission. By indicating the spatial vector selection to the network device when the number of antenna ports in the first dimension of the codebook parameters configured by the network device is 1, the terminal helps the network device select appropriate precoding for better communication with the terminal, reduces interference between transmitted information, and enhances reception accuracy. Attached Figure Description

[0014] 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.

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

[0016] Figure 1B is a schematic diagram of a spatial vector orthogonal to the spatial vector b0 according to an embodiment of the present disclosure.

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

[0018] Figure 3 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0019] Figure 4 is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0020] Figure 5A is a schematic diagram of the structure of a terminal according to an embodiment of the present disclosure.

[0021] Figure 5B is a schematic diagram of the structure of a network device according to an embodiment of the present disclosure.

[0022] Figure 6A is a schematic diagram of the structure of a communication device according to an embodiment of the present disclosure.

[0023] Figure 6B is a schematic diagram of the structure of a chip according to an embodiment of the present disclosure. Detailed Implementation

[0024] This disclosure provides a communication method, communication device, storage medium, and program product.

[0025] 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 number of antenna ports in the first dimension of codebook parameter information configured by the network device is 1, the spatial vector being used by the network device to determine the precoding of downlink data transmission.

[0026] In the above embodiments, when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, the terminal indicates the selection of the spatial vector to the network device. This can help the network device select a suitable precoding to communicate better with the terminal, reduce interference between transmitted information, and enhance reception accuracy.

[0027] 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 indicating the codebook parameter information; and selecting the spatial vector based on the codebook parameter information and downlink channel information measured by the terminal.

[0028] In the above embodiments, the terminal can perform channel estimation based on reference signals such as the Channel Status Information-Reference Signal (CSI-RS) to obtain downlink channel information. For example, it can calculate the maximum number of streams with the minimum downlink channel coherence, which is called the rank of the channel matrix. The terminal can then combine the downlink channel information and codebook parameter information to select the spatial vector that best matches the current channel state for reporting. This improves the communication effect between the network device and the terminal, enhances the accuracy of the interactive information between them, and enables the terminal to better receive information sent by the network device.

[0029] In conjunction with some embodiments of the first aspect, in some embodiments, the first message includes first information, which is used to indicate a first spatial vector selected by the terminal; wherein, the length of the first information is... bits, or, the length of the first information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol is for rounding up.

[0030] Here, the first spatial vector represents the first spatial vector.

[0031] In the above embodiment, through a length of Bit or The first information of the bit can instruct the terminal to select any one of the horizontal and / or vertical spatial vectors from N1O1 candidate spatial vectors, making the selection range of the first spatial vector 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.

[0032] Furthermore, when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, the indication overhead of the first information is small, and the length of the first information is only [missing information]. Bit or This reduces the number of bits, thus achieving the goal of indicating the spatial vector selected by the terminal with less indication overhead, thereby reducing the terminal's feedback overhead without changing system performance.

[0033] In conjunction with some embodiments of the first aspect, in some embodiments, the first message further includes one or more second pieces of information, one piece of second information indicating an i-th spatial vector selected by the terminal, where i is an integer greater than or equal to 2; wherein, the length of one piece of second information is... Bits, or, the length of a second piece of information is Bit.

[0034] Here, the i-th spatial vector represents the i-th spatial vector.

[0035] In the above embodiment, multiple spatial vectors can be selected from N1 candidate spatial vectors, and each vector can be selected using a length of... Bit or The second piece of information is reported, a length of... Bit or The second information of the bit can explicitly indicate any one of the N1 candidate spatial vectors in the horizontal and / or vertical dimensions. Therefore, the selected spatial vector can be any one of the N1 candidate spatial vectors in the horizontal and / or vertical dimensions, 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 a freely chosen spatial vector. Furthermore, this method of independently indicating each selected spatial vector through one or more pieces of second information 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.

[0036] Furthermore, when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, the indication overhead of a second piece of information is relatively small, and the length of the second piece of information is only [missing information]. Bit or This reduces the number of bits, thus achieving the goal of indicating the spatial vector selected by the terminal with less indication overhead, thereby reducing the terminal's feedback overhead without changing system performance.

[0037] In conjunction with some embodiments of the first aspect, in some embodiments, the first message further includes third information, the third information being used to indicate L-1 other spatial vectors selected by the terminal besides the first spatial vector, wherein... v represents the number of layers in the data transmission; where the length of the third information is... Bits, or, the length of the third information is Bit, C is the symbol for calculating combinations.

[0038] In the above embodiment, L-1 spatial vectors can be selected from N1 candidate spatial vectors, and a length of... Bit or A third piece of information for each bit is reported to the L-1 spatial vectors, a length of Bit or The third information of the bit can explicitly indicate any L-1 spatial vectors in the horizontal and / or vertical dimensions from the N1 candidate spatial vectors. Therefore, the selected spatial vector can be any L-1 spatial vectors in the horizontal and / or vertical dimensions from the N1 candidate spatial vectors, 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 a freely chosen spatial vector. Furthermore, this method of indicating L-1 selected spatial vectors through a third information allows the network device to explicitly determine the L-1 spatial vectors selected by the terminal, thereby improving the performance of the selected codebook and reducing the spatial vector indication overhead, thus improving reporting efficiency.

[0039] Furthermore, when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, the indication overhead of the third information is relatively small, and the length of the third information is only [missing information]. Bit or This reduces the number of bits, thus achieving the goal of indicating the spatial vector selected by the terminal with less indication overhead, thereby reducing the terminal's feedback overhead without changing system performance.

[0040] In conjunction with some embodiments of the first aspect, in some embodiments, the first message includes fourth information, the fourth information being used to indicate L spatial vectors selected by the terminal, wherein v represents the number of layers in the data transmission; where the length of the fourth information is... Bits, or, the length of the fourth information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. is the symbol for rounding up, and C is the symbol for calculating combinations.

[0041] In the above embodiment, L spatial vectors can be selected from N1O1 candidate spatial vectors, and a length of L is used to select L spatial vectors. bit or The L spatial vectors are reported with a fourth piece of information. This method of indicating the L selected spatial vectors with a fourth piece of information allows the network device to explicitly determine the L spatial vectors selected by the terminal, thereby improving the performance of the selected codebook and reducing the spatial vector indication overhead.

[0042] Furthermore, when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, the indication overhead of the fourth information is relatively small, and the length of the fourth information is only [missing information]. bit or This reduces the number of bits, thus achieving the goal of indicating the spatial vector selected by the terminal with less indication overhead, thereby reducing the terminal's feedback overhead without affecting system performance.

[0043] In conjunction with some embodiments of the first aspect, in some embodiments, sending the first message to the network device includes: sending the first message to the network device via the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH), wherein the first message is included in the reported Channel State Information (CSI).

[0044] In the above embodiments, it is specified that the first message can be included in the Channel State Information (CSI) and reported via PUCCH or PUSCH.

[0045] 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 number of antenna ports in the first dimension of codebook parameter information configured by the network device is 1; and determining precoding for downlink data transmission based on the spatial vector selected by the terminal.

[0046] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: sending a second message to the terminal, the second message indicating the codebook parameter information.

[0047] In conjunction with some embodiments of the second aspect, in some embodiments, the first message includes first information, the length of which is... bits, or, the length of the first information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol is for rounding up; determining the spatial vector selected by the terminal based on the first message includes: determining the first spatial vector selected by the terminal based on the first information.

[0048] In conjunction with some embodiments of the second aspect, in some embodiments, the first message further includes one or more second pieces of information, wherein the length of one piece of second information is... Bits, or, the length of a second piece of information is Bit; determining the spatial vector selected by the terminal according to the first message includes: determining an i-th spatial vector selected by the terminal according to a first message, where i is an integer greater than or equal to 2.

[0049] In conjunction with some embodiments of the second aspect, in some embodiments, the first message further includes third information, the length of which is... Bits, or, the length of the third information is bits, where v represents the number of layers for transmitting data, and C is the symbol for calculating the combination number; determining the spatial vector selected by the terminal according to the first message includes: determining L-1 other spatial vectors selected by the terminal besides the first spatial vector according to the third information.

[0050] In conjunction with some embodiments of the second aspect, in some embodiments, the first message includes fourth information, wherein the length of the third fourth information is... Bits, or, the length of the fourth information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. is the symbol for rounding up, and C is the symbol for combinations. v represents the number of layers for transmitting data; determining the spatial vector selected by the terminal based on the first message includes: determining L spatial vectors selected by the terminal based on the fourth information.

[0051] Thirdly, embodiments of this disclosure provide 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.

[0052] Fourthly, embodiments of this disclosure provide 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.

[0053] Fifthly, embodiments of this disclosure provide a communication device, which includes one or more processors; wherein the terminal is used to execute an optional implementation of the first aspect or the second aspect.

[0054] In a sixth 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.

[0055] In a seventh aspect, 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.

[0056] Eighthly, embodiments of this disclosure provide a program product comprising at least one of a program and instructions, wherein when the program and instructions are executed by a communication device, the communication device performs the method as described in the optional implementations of the first and second aspects.

[0057] In a ninth 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.

[0058] In a tenth aspect, 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.

[0059] It is understood that the aforementioned terminals, network devices, communication 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.

[0060] This disclosure provides a communication method, a communication device, a storage medium, and a program product. In some embodiments, the terms "communication method" and "information processing method," "spatial vector indication method based on Type I codebook feedback," etc., can be used interchangeably.

[0061] 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. In all embodiments of this disclosure, unless otherwise specified or logically conflicting, the terminology and / or descriptions between the embodiments are consistent and can be mutually referenced. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0062] 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.

[0063] 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.

[0064] In the embodiments disclosed herein, "multiple" refers to two or more.

[0065] In some embodiments, the terms “at least one of A or B, at least one of A and B”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0066] 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 whether there is a branch B); in some embodiments, B (execute B regardless of whether there is a branch A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, both A and B are executed. The same applies when there are more branches such as A, B, C, etc.

[0067] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execute A regardless of whether a branch B exists); in some embodiments, B (execute B regardless of whether a branch A exists); 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, and C.

[0068] 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.

[0069] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0070] In some embodiments, terms such as "time / frequency" and "time-frequency domain" refer to the time domain and / or frequency domain.

[0071] In some embodiments, terms such as “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “when…”, “if…”, etc. can be used interchangeably. These descriptions all refer to the device making a corresponding action under certain objective circumstances. They do not necessarily limit the time, nor do they require the device to make a judgment action when implementing it, nor do they mean that there must be other limitations.

[0072] 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”.

[0073] In some embodiments, devices, etc., may be interpreted as physical or virtual, and their names are not limited to those described in the embodiments. Terms such as “device,” “equipment,” “circuit,” “network element,” “network function,” “network device,” “function,” “node,” “unit,” “section,” “system,” “network,” “chip,” “chip system,” “entity,” and “subject” are interchangeable.

[0074] In some embodiments, "network" can be interpreted as devices included in a network (e.g., access network devices, core network devices, etc.).

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0080] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] In some embodiments, network device 102 may include at least one of access network device and core network device.

[0085] 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.

[0086] 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.

[0087] 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).

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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).

[0093] 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-RSThe number of ports 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. Table 1 shows the CSI-RS port configuration for ports with more than 32 ports.

[0094] Table 1

[0095] 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.

[0096] 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:

[0097] Supports O1=O2 values ​​that are the same as RI=1-4;

[0098] Option A (based on Option 3 described in RAN1#116bis):

[0099] 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).

[0100] For RI = 5-8, v layers are mapped to selected SD basis vectors that follow the traditional Rel-15 Type-I.

[0101] W2 structure: follows the traditional Rel-15 Type-I RI=5-8.

[0102] Option B (based on Option 2 described in RAN1#116bis):

[0103] 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.

[0104] The SD basis vectors are freely chosen from a set of N1N2 orthogonal SD Discrete Fourier Transform (DFT) basis vectors by means of combination.

[0105] 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.

[0106] Rel-19 only supports scheme A (RI = 1 - 4 + RI = 5 - 8) and scheme B (RI = 1 - 4 + RI = 5 - 8).

[0107] 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:

[0108] 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.

[0109] 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 parts filled with color (gray and black) 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, N1 represents the number of ports in the horizontal dimension, and N2 represents the number of ports in the vertical dimension.

[0110] 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.

[0111] In some embodiments, the W2 structure uses the same design method for the polarization co-phase factor of each layer as the design method for the polarization co-phase factor of each layer when the Rank of the traditional Rel-15 Type I SP CB is 5 to 8. That is, some layers use the same co-phase factor, and the co-phase factor of some layers is set to 1.

[0112] In some embodiments, for Type I SP CB, the structure of Scheme A described above is adopted. When Rank = 5 to 8, the UE first selects the first SD basis vector according to the following instructions:

[0113] For Rel-19 Type I SP codebook optimization of 48, 64, and 128 CSI-RS ports, regarding the first SD basis vector selection index of scheme A with RI = 5-8, the traditional Rel-15 Type I SP scheme is reused, i.e., using respectively... Bit and The (i1, i2) bits indicate information.

[0114] In some embodiments, two or three SD basis vectors are selected in accordance with the conclusions below.

[0115] Choose 2 or 3 SD basis vectors.

[0116] Optimization of the Rel-19 Type-I SP codebook for 48, 64, and 128 CSI-RS ports, with scheme A RI = 5-8, for other n... SDBV The UCI parameters of the SD basis vector selection scheme are as follows:

[0117] A 1-bit beamgroup indication information i3∈{0,1};

[0118] For each n SDBV For other selected SD basis vectors, if i3 = 0, then... and (i.e., q2) indicates information; in this case, q1 is equal to mod(i1,O1) of the horizontal dimension offset of the first SD basis vector.

[0119] If i3 = 1, then, and (i.e., q1) indicates information; in this case, q2 is equal to mod(i2,O2) of the vertical dimension offset of the first SD basis vector.

[0120] Note: (q1, q2) is similar to (q1, q2) in Type-IICSI.

[0121] Note: n SDBV =2 (v=5-6) or 3 (v=7-8).

[0122] In some embodiments, when the Type I SP CB uses the above-described Scheme A structure, and the number of ports is less than or equal to 32, Scheme A still achieves better performance than the traditional Rel-15 Type I SP CB under the same feedback overhead. Therefore, when Rank = 5 to 8 and the number of CSI-RS antenna ports is less than or equal to 32, Scheme A can also be used to implement CSI feedback.

[0123] In some embodiments, when the number of CSI-RS antenna ports is less than or equal to 32, the corresponding number of horizontal dimension ports N1 and vertical dimension ports N2 are shown in Table 2 below. Table 2 shows the CSI-RS port configuration for no more than 32 ports. When N2>1, the SD vector indication method of Rel-19 Type I SPCB described above can be used. However, when N2=1, using the indication method for N2>1 may require significant feedback overhead. For example, assuming the gNB configures 24 CSI-RS resource ports for the UE, and N1=12, N2=1, Table 2 shows O1=4, O2=1. Assuming the UE selects rank=6 based on the estimated downlink channel information, the UE also needs to select L=3 SD vectors for calculating the precoding of the transmitted data. The overhead of indicating these 3 SD vectors is...

[0124] Table 2

[0125] In some embodiments, the communication method of this disclosure can independently and hierarchically instruct each SD vector selected by the terminal, or jointly instruct the L SD vectors selected by the terminal, where L is greater than 1. This enables the network device to select appropriate precoding for better communication with the terminal with less instruction overhead, even when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, thereby reducing interference between transmitted information and enhancing reception accuracy.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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 at least one of the following steps:

[0130] In step S201, network device 102 sends a second message to terminal 101.

[0131] In some embodiments, the terminal receives a second message. For example, terminal 101 receives a second message sent by network device 102.

[0132] In some embodiments, the second message is used to configure codebook parameters.

[0133] In some embodiments, the second message is used to indicate codebook parameter information.

[0134] In some embodiments, the name of the second message is not limited, and may be, for example, a codebook configuration command, a codebook parameter indication message, etc.

[0135] In some embodiments, the second message includes codebook parameter information. Optionally, the codebook parameter information includes, but is not limited to, parameters N1 and N2. Here, N1 represents the number of antenna ports in the second dimension. N2 represents the number of antenna ports in the first dimension, and N2 is 1. For example, the first dimension can be a vertical dimension, and the second dimension can be a horizontal dimension, but is not limited thereto.

[0136] In some embodiments, codebook parameter information is used by the terminal to select a spatial vector in conjunction with estimated / measured downlink channel information. For example, the spatial vector that best fits the current channel state is selected. Of course, this disclosure also supports the free selection of spatial vectors.

[0137] In some embodiments, codebook parameter information is used by the terminal to determine candidate spatial vectors.

[0138] 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.

[0139] 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, etc.

[0140] In step S202, terminal 101 performs channel measurement to obtain downlink channel information.

[0141] It should be explained that channel measurement can be understood as channel estimation, which refers to the process of estimating the model parameters of a hypothetical channel model from received data. The purpose of channel measurement or estimation is to minimize the uncertainty of the channel and obtain the channel parameters.

[0142] In some embodiments, channel measurement includes measuring reference signals such as 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.

[0143] In step S203, terminal 101 selects a spatial vector.

[0144] In some embodiments, the terminal selects a spatial vector based on the estimated downlink channel information and codebook parameter information.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] In some embodiments, downlink channel information includes a channel matrix. The terminal can determine the rank of the channel matrix, which can be any value from 1 to 8, but is not limited thereto.

[0149] In some embodiments, the terminal can select There are spatial vectors. Among them, The rounding operator is used for rounding up. v represents the number of layers in the data transmission, v = Rank, or v <Rank。

[0150] In some embodiments, the terminal selects L spatial vectors from the candidate spatial vectors. Since the number of antenna ports N2 in the first dimension of the codebook parameter information configured in the network device is 1, and the oversampling factor O2 in the first dimension is 1 when the number of antenna ports N2 in the first dimension is 1, for example, referring to Table 2, when the number of CSI-RS antenna ports is less than or equal to 32 and the number of antenna ports N2 in the first dimension is 1, the oversampling factor O2 in the first dimension is 1. Therefore, the total number of candidate spatial vectors is N1O1, where N1 represents the number of antenna ports in the second dimension, and O1 represents the oversampling factor in the second dimension.

[0151] In step S204, terminal 101 sends a first message to network device 102.

[0152] In some embodiments, the network device receives a first message. For example, network device 102 receives a first message sent by terminal 101.

[0153] 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.

[0154] In some embodiments, the first message is used to indicate the spatial vector selected by the terminal when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1.

[0155] For example, the terminal sends a first message to the network device, which indicates the spatial vector selected by the terminal based on downlink channel information, provided that the number of antenna ports in the first dimension of the codebook parameters configured by the network device is 1. 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.

[0156] In some embodiments, the terminal sending the first message to the network device can be implemented by the terminal sending the first message to the network device via PUCCH or PUSCH. Optionally, the first message is included in the reported CSI.

[0157] For example, the first message is reported to the network device via PUCCH or PUSCH resources based on CSI. This first message can be reported in the first part (Part 1) or the second part (Part 2) of CSI.

[0158] For example, the first message is placed within part 1 and / or part 2 of the CSI and sent to the network device. For instance, the terminal places the first message in the Precoding Matrix Indication (PMI) within part 2 of the CSI and sends the CSI to the network device. The network device receives the CSI, obtains the first message from the PMI within part 2 of the CSI, and thus learns the spatial vector selected by the terminal.

[0159] In some embodiments, the terminal can independently indicate the selected spatial vectors. For example, the first message includes multiple pieces of information for indicating the selected spatial vectors respectively.

[0160] In some embodiments, the first message includes first information. 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.

[0161] In some embodiments, the length of the first information is Bits, or the length of the first piece of information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol is for rounding up.

[0162] In some embodiments, the first information is used to indicate the first spatial vector selected by the terminal. The first spatial vector refers to the first spatial vector selected by the terminal from N1O1 candidate spatial vectors. Alternatively, the first spatial vector refers to a spatial vector selected from N1O1 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.

[0163] For example, suppose the network device configures 24 CSI-RS resource ports for the terminal, and N1 = 12, N2 = 1. Then, as shown in Table 2, O1 = 4, O2 = 1. Assuming the terminal selects Rank = 6 based on the estimated downlink channel information, the terminal needs to select L = 3 spatial vectors for calculating the precoding of the transmitted data. Based on the configured codebook parameters, the terminal knows the total number of candidate spatial vectors is N1O1 = 48. Further, based on the estimated downlink channel information, the terminal can first select the first spatial vector from the 48 candidate spatial vectors, and then use a vector of length... or The first information indicates the first spatial vector.

[0164] In some embodiments, the terminal may indicate L-1 other spatial vectors besides the first spatial vector through one or more second pieces of information. That is, the first message includes one or more pieces of second information. One piece of second information is used to indicate an i-th spatial vector selected by the terminal, where i is an integer greater than or equal to 2. Here, the i-th spatial vector represents the i-th spatial vector selected by the terminal.

[0165] In some embodiments, the name of the second information is not limited, and it may be, for example, a second indication, a second field, a second bit sequence, etc.

[0166] In some embodiments, the length of a second piece of information is Bits, or, the length of a second piece of information is Bit.

[0167] In some embodiments, the oversampling offset of the i-th spatial vector is the same as that of the first spatial vector. Since the oversampling offset of the first spatial vector can be known from the first spatial vector indicated by the terminal, the oversampling offset of the i-th spatial vector does not need to be redundantly indicated when indicating the i-th spatial vector.

[0168] For example, when i is 2, a second spatial vector is selected by the terminal via a second piece of information. For example, when i is 3, a third spatial vector is selected by the terminal via a second piece of information. When i is 4, a fourth spatial vector is selected by the terminal via a second piece of information. But it is not limited to these.

[0169] For example, suppose the network device configures 24 CSI-RS resource ports for the terminal, and N1 = 12, N2 = 1. Then, as shown in Table 2, O1 = 4, O2 = 1. Assuming the terminal selects Rank = 6 based on the estimated downlink channel information, the terminal needs to select L = 3 spatial vectors for calculating the precoding of the transmitted data. After the terminal selects the first spatial vector, it can select the i-th spatial vector from N1 or N1-1 candidate spatial vectors, and can use a length of... or A second piece of information indicates the i-th spatial vector selected by the terminal.

[0170] In some embodiments, the terminal can uniformly indicate L-1 other spatial vectors besides the first spatial vector through a third piece of information. That is, the first message includes the third information, which is used to indicate the L-1 other spatial vectors selected by the terminal besides the first spatial vector, wherein... v represents the number of layers for transmitting data.

[0171] In some embodiments, the name of the third information is not limited, and it may be, for example, a third indication, a third field, a third bit sequence, etc.

[0172] In some embodiments, the length of the third information is Bits, or the length of the third information, is Bit, where C is the symbol for the combination number. It should be explained that the number of all combinations of choosing m (m≤n) elements from n elements is called the combination number of choosing m elements from n elements, denoted as ...

[0173] In some embodiments, the oversampling offsets of all spatial vectors are the same. The oversampling offset of the first spatial vector can be known from the first spatial vector indicated by the terminal, so the oversampling offsets do not need to be redundantly indicated when indicating L-1 other spatial vectors besides the first spatial vector.

[0174] For example, suppose the network device configures 24 CSI-RS resource ports for the terminal, and N1 = 12, N2 = 1. Then, as shown in Table 2, O1 = 4, O2 = 1. Assuming the terminal selects Rank = 6 based on the estimated downlink channel information, the terminal needs to select L = 3 spatial vectors for calculating the precoding of the transmitted data. After the terminal selects the first spatial vector, it can select L-1 spatial vectors from N1 or N1-1 candidate spatial vectors, and can use a length of... or The third information indicates the L-1 spatial vectors selected by the terminal.

[0175] In some embodiments, the terminal may uniformly indicate the selected spatial vectors. For example, the first message includes an indication message for uniformly indicating all selected spatial vectors.

[0176] In some embodiments, the first message includes fourth information, which indicates L spatial vectors selected by the terminal, wherein... v represents the number of layers for transmitting data.

[0177] In some embodiments, the name of the fourth information is not limited, and it may be, for example, a fourth indication, a fourth field, a fourth bit sequence, etc.

[0178] In some embodiments, the length of the fourth information is Bits, or the length of the fourth information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol is for rounding up.

[0179] In some embodiments, the oversampling offset is the same for each spatial vector.

[0180] For example, suppose the network device configures 24 CSI-RS resource ports for the terminal, and N1 = 12, N2 = 1. Then, as shown in Table 2, O1 = 4, O2 = 1. Assuming the terminal selects Rank = 6 based on the estimated downlink channel information, the terminal needs to select L = 3 spatial vectors for calculating the precoding of the transmitted data. The terminal knows from the configured codebook parameters that the total number of candidate spatial vectors is N1O1 = 48. Based on the estimated downlink channel information, the terminal selects L spatial vectors from the 48 candidate spatial vectors and uses a length of... or The fourth piece of information indicates the L spatial vectors selected by the terminal.

[0181] It should be noted that, The information indicates the oversampling offset in the second dimension. The information indicates the selection of L spatial vectors from N1 spatial vectors. It indicates the selection of L spatial vectors from N1O1 spatial vectors.

[0182] The terminal can flexibly choose an independent indication method or a unified indication method to indicate the L spatial vectors selected by the terminal, according to its needs.

[0183] In step S205, network device 102 determines the spatial vector selected by the terminal based on the first message.

[0184] In some embodiments, the network device determines, based on a first message, the spatial vector selected by the terminal when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1.

[0185] In some embodiments, the first message includes first information, the length of which is [missing information]. Bits, or the length of the first piece of information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol is for rounding up. The implementation method of the network device determining the spatial vector selected by the terminal based on the first message includes: determining the first spatial vector selected by the terminal based on the first information.

[0186] In some embodiments, the first message includes one or more second pieces of information, wherein the length of one piece of second information is [length missing]. Bits, or, the length of a second piece of information is Bits. An implementation method for a network device to determine the spatial vector selected by a terminal based on a first message includes: determining an i-th spatial vector selected by the terminal based on a first message, where i is an integer greater than or equal to 2.

[0187] In some embodiments, the first message includes third information, the length of which is [missing information]. Bits, or the length of the third information, is bits, where v represents the layer number of the transmitted data. The implementation method for the network device to determine the spatial vector selected by the terminal based on the first message includes: determining L-1 other spatial vectors selected by the terminal besides the first spatial vector based on the third information.

[0188] In some embodiments, the first message includes fourth information, wherein the length of the third and fourth information is [missing information]. Bits, or the length of the fourth information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The rounding operator is used for rounding up. v represents the layer number for data transmission. The implementation method for the network device to determine the spatial vector selected by the terminal based on the first message includes: determining L spatial vectors selected by the terminal based on the fourth information.

[0189] In step S206, network device 102 determines the precoding of downlink data transmission based at least on the spatial vector selected by the terminal.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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".

[0196] In some embodiments, terms such as "physical downlink shared channel (PDSCH)" and "DL data" can be used interchangeably, as can terms such as "physical uplink shared channel (PUSCH)" and "UL data".

[0197] In some embodiments, the terms "synchronization signal (SS)," "synchronization signal block (SSB)," "reference signal (RS)," "pilot," and "pilot signal" can be used interchangeably.

[0198] In some embodiments, the terms “resource block (RB)”, “physical resource block (PRB)”, “sub-carrier group (SCG)”, “resource element group (REG)”, “PRB pair”, “RB pair”, “resource element (RE)”, and “sub-carrier” can be used interchangeably.

[0199] 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.

[0200] In some embodiments, "acquire," "get," "obtain," "receive," "transmit," "bidirectional transmission," and "send and / or receive" can be used interchangeably and can be interpreted as receiving from other entities, acquiring from protocols, acquiring from higher layers, obtaining through self-processing, or autonomous implementation. Protocols include, for example, at least one of the 3GPP protocol, Wi-Fi protocol, and audio and / or video protocols.

[0201] In some embodiments, terms such as “send,” “transmit,” “report,” “distribute,” “transfer,” “bidirectional transmission,” “send and / or receive” can be used interchangeably.

[0202] 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.

[0203] The communication method involved in the embodiments of this disclosure may include at least one of steps S201 to S206. 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.

[0204] 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.

[0205] In some embodiments, steps S201 to S203, S205, and S206 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0206] In some embodiments, steps S201 to S203 and step S206 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0207] In some embodiments, the steps and their optional implementations in other embodiments described before or after this embodiment, as well as other related parts in the specification, can be referred to, and will not be repeated here.

[0208] Figure 3 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 3, the embodiment of the present disclosure relates to a communication method executed by a communication system 100, the method including:

[0209] In step S301, terminal 101 sends a first message to network device 102.

[0210] Optionally, before sending the first message to the network device, the terminal includes: receiving a second message sent by the network device, the second message indicating the codebook parameter information; and selecting the spatial vector based on the codebook parameter information and the downlink channel information measured by the terminal.

[0211] Optionally, the first message includes first information, which indicates the first spatial vector selected by the terminal; wherein the length of the first information is... Bits, or the length of the first piece of information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol is for rounding up.

[0212] Optionally, the first message further includes one or more second pieces of information, one of which indicates an i-th spatial vector selected by the terminal, where i is an integer greater than or equal to 2; wherein the length of one piece of second information is... Bits, or, the length of a second piece of information is Bit.

[0213] Optionally, the first message also includes third information, which indicates the L-1 other spatial vectors selected by the terminal besides the first spatial vector, wherein... v represents the number of layers in the data transmission; where the length of the third information is... Bits, or the length of the third information, is Bit.

[0214] Optionally, the first message includes fourth information, which indicates the L spatial vectors selected by the terminal, wherein... v represents the number of layers in the data transmission; where the length of the fourth information is... Bits, or the length of the fourth information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol is for rounding up.

[0215] Optionally, sending the first message to the network device includes: sending the first message to the network device via the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH), wherein the first message is included in the reported Channel State Information (CSI).

[0216] In step S302, network device 102 determines the spatial vector selected by the terminal when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, based on the first message.

[0217] Optionally, the network device sends a second message to the terminal, the second message indicating codebook parameter information.

[0218] Optionally, the first message includes first information, the length of which is... Bits, or the length of the first piece of information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol is for rounding up; the network device 102 determines the spatial vector selected by the terminal according to the first message, including: determining the first spatial vector selected by the terminal according to the first information.

[0219] Optionally, the first message may further include one or more second messages, wherein the length of one second message is [length missing]. Bits, or, the length of a second piece of information is Bit; The network device 102 determines the spatial vector selected by the terminal according to the first message, including: determining the i-th spatial vector selected by the terminal according to a first message, where i is an integer greater than or equal to 2.

[0220] Optionally, the first message may also include third information, the length of which is... Bits, or the length of the third information, is bits, where v represents the number of layers for transmitting data; the network device 102 determines the spatial vector selected by the terminal according to the first message, including: determining L-1 other spatial vectors selected by the terminal besides the first spatial vector according to the third information.

[0221] Optionally, the first message includes a fourth message, wherein the length of the third and fourth messages is [length missing]. Bits, or, the length of the fourth information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The rounding operator is used for rounding up. v represents the number of layers for transmitting data; the network device 102 determines the spatial vector selected by the terminal according to the first message, including: determining the L spatial vectors selected by the terminal according to the fourth information.

[0222] In step S303, network device 102 determines the precoding for downlink data transmission based on the spatial vector selected by the terminal.

[0223] In some embodiments, the steps and their optional implementations in other embodiments described before or after this embodiment, as well as other related parts in the specification, can be referred to, and will not be repeated here.

[0224] Figure 4 is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 4, this embodiment relates to a communication method executed by terminal 101, the method including:

[0225] In step S401, the terminal sends a first message to the network device. The first message indicates the spatial vector selected by the terminal when the number of antenna ports in the first dimension is 1 in the codebook parameter information configured by the network device.

[0226] In some embodiments, the steps and their optional implementations in other embodiments described before or after this embodiment, as well as other related parts in the specification, can be referred to, and will not be repeated here.

[0227] In some embodiments, the communication method disclosed herein can be understood as an SD vector indication method based on Type I SP CB, including NW configuration codebook parameter information, wherein the codebook parameters include at least N1 and N2. The UE then determines the selected L SD vectors based on the configured codebook parameters and the estimated downlink channel information.

[0228] Suppose that the UE selects L SD vectors.

[0229] In some embodiments, at least one SD vector is indicated by an independent SD vector indicating information.

[0230] Optionally, the first SD vector is determined by its size. or The instruction information indicates that the remaining L-1 SD vectors are respectively determined by size or The indication information is provided. Compared with related technologies, this method no longer requires 1 bit to indicate whether the candidate SD vectors orthogonal to the first SD vector are located in the horizontal or vertical dimension.

[0231] Optionally, the first SD vectors are sized by the vector. or The instruction is that the remaining L-1 SD vectors are... or The instruction information indicates that... This represents the number of combinations of selecting L-1 SD vectors from N1 SD vectors.

[0232] In some embodiments, L SD vectors are jointly indicated by an indication message.

[0233] Optionally, through ( or Indicates L SD vectors.

[0234] in, The information is used to indicate the offset of oversampling. The indication information is used to indicate the N1 SD vectors selected by the UE.

[0235] In some embodiments, the indication information in the above embodiments is reported to the NW through PUCCH or PUSCH resources based on one or two CSI parts. When reported based on two CSI parts, the indication information can be placed in the first part of the two CSI parts, i.e., Part 1, or the second part, i.e., Part 2.

[0236] In some embodiments, NW can calculate the precoding for downlink data transmission based at least on the received SD vectors indication information and the structure of the Type I SPCB.

[0237] In some embodiments, assuming the gNB configures 24 CSI-RS resource ports for the UE, and N1 = 12, N2 = 1, then from Table 2, O1 = 4, O2 = 1. Assuming the UE selects rank = 6 based on the estimated downlink channel information, then the UE also needs to select L = 3 SD vectors for calculating the precoding of the transmitted data.

[0238] Optionally, the UE can... Indicates the first SD vector. Then through two vectors of size... The indication information points to the second and third SD vectors respectively. The indication overhead for these three SD vectors is 6 + 4 + 4 = 14 bits. Compared with the example scheme before Figure 2A, this method can save 2 bits of SD vector indication overhead.

[0239] Optionally, the second and third SD vectors are... Instructions or through Indication. The indication overhead of these 3 SD vectors is 13 or 12 bits. Compared with the example scheme before Figure 2A, this method can save 3 or 4 bits of SD vector indication overhead.

[0240] In some embodiments, the indication information for L = 3 SD vectors is reported in one CSI part, or when reported in two CSI parts, the indication information is placed in CSI part 1 or CSI part 2, and sent to the gNB via PUCCH or PUSCH resources.

[0241] In some embodiments, assuming the gNB configures 24 CSI-RS resource ports for the UE, and the gNB configures N1=12, N2=1, then from Table 2, we know O1=4 and O2=1. Assuming the UE selects rank=6 based on the estimated downlink channel information, then the UE also needs to select L=3 SD vectors for calculating the precoding of the transmitted data.

[0242] Optionally, the UE can... This method indicates the three SD vectors selected by the UE. Compared to the previous embodiment where the overhead for indicating three SD vectors was 12, 13, or 14 bits, this method can save up to 5 or 6 bits. And compared to the example scheme before Figure 2A, this method can save half of the SD vectors indication overhead.

[0243] Therefore, the communication method disclosed herein can indicate the L SD vectors selected by the UE with less SD vector indication overhead.

[0244] In some embodiments, the steps and their optional implementations in other embodiments described before or after this embodiment, as well as other related parts in the specification, can be referred to, and will not be repeated here.

[0245] This disclosure also proposes an apparatus (also referred to as a communication device, etc.) for implementing any of the above methods. For example, an apparatus is proposed that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Furthermore, another apparatus is proposed 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.

[0246] 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.

[0247] 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).

[0248] Figure 5A is a schematic diagram of the structure of a terminal according to an embodiment of the present disclosure. Terminal 5100 is used to execute any of the above methods. In some embodiments, as shown in Figure 5A, terminal 5100 may include at least one of a transceiver module 5101, a processing module 5102, etc. In some embodiments, the transceiver module 5101 is used to send a first message to a network device, the first message indicating the spatial vector selected by the terminal when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, the spatial vector being used by the network device to determine the precoding of downlink data transmission. Optionally, the transceiver module 5101 is used to execute at least one of the communication steps (e.g., steps S201, S204, but not limited thereto) executed by terminal 101 in any of the above methods, which will not be elaborated here. Optionally, the processing module 5102 is used to execute at least one of the other steps (e.g., steps S202, S203, S205, S206, but not limited thereto) executed by terminal 101 in any of the above methods, which will not be elaborated here.

[0249] Figure 5B is a schematic diagram of the structure of a network device according to an embodiment of the present disclosure. The network device 5200 is used to perform any of the above methods. In some embodiments, as shown in Figure 5B, the network device 5200 may include at least one of a transceiver module 5201, a processing module 5202, etc. In some embodiments, the transceiver module 5201 is used to receive a first message sent by a terminal; the processing module 5202 is used to determine, based on the first message, the spatial vector selected by the terminal when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1; and to determine the precoding of downlink data transmission based on the spatial vector selected by the terminal. Optionally, the transceiver module 5201 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 5200 in any of the above methods, which will not be elaborated further here. Optionally, the processing module 5202 is used to execute at least one of the other steps (such as steps S202, S203, S205, and S206, but not limited thereto) executed by the network device 5200 in any of the above methods, which will not be elaborated here.

[0250] 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.

[0251] 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.

[0252] In some embodiments, the processing module can be replaced by the processor, and the transceiver module can be replaced by the transceiver.

[0253] Figure 6A is a schematic diagram of the structure of a communication device 6100 according to an embodiment of the present disclosure. The communication device 6100 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 6100 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.

[0254] As shown in Figure 6A, the communication device 6100 is used to execute any of the above methods. In some embodiments, the communication device 6100 includes one or more processors 6101. The processor 6101 may be a general-purpose processor or a special-purpose processor, such as a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may 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 6100 is used to execute any of the above methods. Optionally, one or more processors 6101 are used to invoke instructions to cause the communication device 6100 to execute any of the above methods.

[0255] In some embodiments, the communication device 6100 further includes one or more transceivers 6102. When the communication device 6100 includes one or more transceivers 6102, the transceiver 6102 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, and the processor 6101 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; the terms receiver, receiving unit, receiver, receiving circuit, etc., can be used interchangeably.

[0256] In some embodiments, the communication device 6100 further includes one or more memories 6103 for storing data and / or instructions. Optionally, one or more processors 6101 are used to invoke instructions stored in the memory 6103 to cause the communication device 6100 to perform any of the above methods. Optionally, all or part of the memory 6103 may also be located outside the communication device 6100. In an optional embodiment, the communication device 6100 may include one or more interface circuits 6104. Optionally, the interface circuit 6104 is connected to the memory 6103 and can be used to receive data and / or instructions from the memory 6103 or other devices, and can be used to send data and / or instructions to the memory 6103 or other devices. For example, the interface circuit 6104 can read data and / or instructions stored in the memory 6103 and send the data and / or instructions to the processor 6101.

[0257] The communication device 6100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 6100 described in this disclosure is not limited thereto, and the structure of the communication device 6100 may not be limited by FIG. 6A. The communication device may be a standalone device or a 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, programs and / or instructions; (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.

[0258] Figure 6B is a schematic diagram of the structure of chip 6200 according to an embodiment of the present disclosure. For cases where the communication device 6100 can be a chip or a chip system, the schematic diagram of chip 6200 shown in Figure 6B can be referenced, but is not limited thereto.

[0259] Chip 6200 includes one or more processors 6201. Chip 6200 is used to perform any of the methods described above.

[0260] In some embodiments, chip 6200 further includes one or more interface circuits 6202. Optionally, terms such as interface circuit, interface, and transceiver pin can be used interchangeably. In some embodiments, chip 6200 further includes one or more memories 6203 for storing data and / or instructions. Optionally, all or part of the memories 6203 may be located outside of chip 6200. Optionally, interface circuit 6202 is connected to memory 6203, and interface circuit 6202 can be used to receive data and / or instructions from memory 6203 or other devices, and interface circuit 6202 can be used to send data and / or instructions to memory 6203 or other devices. For example, interface circuit 6202 can read data and / or instructions stored in memory 6203 and send the data and / or instructions to processor 6201.

[0261] In some embodiments, the interface circuit 6202 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 6202 performing the communication steps (e.g., sending and / or receiving) in the above-described method means that the interface circuit 6202 performs data and / or instruction interaction between the processor 6201, the chip 6200, the memory 6203, or the transceiver device. In some embodiments, the processor 6201 performs at least one of other steps (e.g., steps S202, S203, S205, S206, but not limited thereto).

[0262] 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.

[0263] This disclosure also proposes a storage medium storing instructions that, when executed on a communication device, cause the communication device 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.

[0264] This disclosure also proposes a program product, including a program and / or instructions, which, when executed by a communication device, cause the communication device to perform any of the above methods. Optionally, the program product is a computer program product. Optionally, the program product is stored on the storage medium.

[0265] 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 indicating the spatial vector selected by the terminal when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1, the spatial vector being 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 indicating the codebook parameter information; The spatial vector is selected based on the codebook parameter information and the downlink channel information measured by the terminal.

3. The method according to claim 1 or 2, characterized in that, The first message includes first information, which is used to indicate the first spatial vector selected by the terminal; Wherein, the length of the first information is bits, or, the length of the first information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is 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 one or more second pieces of information, one of which indicates that the terminal has selected an i-th spatial vector, where i is an integer greater than or equal to 2; Among them, the length of one of the second pieces of information is Bits, or, the length of a second piece of information is Bit.

5. The method according to claim 3, characterized in that, The first message also includes third information, which indicates the L-1 other spatial vectors selected by the terminal besides the first spatial vector, wherein... v represents the number of layers for transmitting data; Wherein, the length of the third information is Bits, or, the length of the third information is Bit, C is the symbol for calculating combinations.

6. The method according to claim 1 or 2, characterized in that, The first message includes fourth information, which indicates the L spatial vectors selected by the terminal, wherein... v represents the number of layers for transmitting data; The length of the fourth information is Bits, or, the length of the fourth information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. is the symbol for rounding up, and C is the symbol for calculating combinations.

7. The method according to any one of claims 1-6, characterized in that, Sending the first message to the network device includes: The first message is sent to the network device via the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH), wherein the first message includes the reported Channel State Information (CSI).

8. A communication method, characterized in that, Performed by a network device, the method includes: The first message sent by the receiving terminal; Based on the first message, the spatial vector selected by the terminal is determined when the number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1. The precoding for downlink data transmission is determined based on the spatial vector selected by the terminal.

9. The method according to claim 8, characterized in that, The method further includes: A second message is sent to the terminal, the second message indicating the codebook parameter information.

10. The method according to claim 8 or 9, characterized in that, The first message includes first information, the length of which is... bits, or, the length of the first information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. The calculation symbol for rounding up; Determining the spatial vector selected by the terminal based on the first message includes: The first spatial vector selected by the terminal is determined based on the first information.

11. The method according to claim 10, characterized in that, The first message also includes one or more second pieces of information, wherein the length of one piece of second information is... Bits, or, the length of a second piece of information is Bit; Determining the spatial vector selected by the terminal based on the first message further includes: The terminal selects an i-th spatial vector based on a first message, where i is an integer greater than or equal to 2.

12. The method according to claim 10, characterized in that, The first message also includes third information, the length of which is Bits, or, the length of the third information is bits, where v represents the number of layers for transmitting data, and C is the symbol for calculating the combination number; Determining the spatial vector selected by the terminal based on the first message further includes: Based on the third information, the terminal selects L-1 other spatial vectors besides the first spatial vector.

13. The method according to claim 8 or 9, characterized in that, The first message includes fourth information, wherein the length of the third fourth information is... Bits, or, the length of the fourth information is Bits, where N1 is the number of antenna ports in the second dimension of the codebook parameter information, and O1 is the oversampling factor in the second dimension. is the symbol for rounding up, and C is the symbol for combinations. v represents the number of layers for transmitting data; Determining the spatial vector selected by the terminal based on the first message includes: The L spatial vectors selected by the terminal are determined based on the fourth information.

14. 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 number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1. The spatial vector is used by the network device to determine the precoding of downlink data transmission.

15. A network device, characterized in that, include: The transceiver module receives 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 number of antenna ports in the first dimension of the codebook parameter information configured by the network device is 1; and to determine the precoding of downlink data transmission based on the spatial vector selected by the terminal.

16. 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 1-13 to be executed.

17. 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 1-13.

18. A program product comprising at least one of a program and instructions, characterized in that, When at least one of the programs or instructions is executed by the communication device, the communication method according to any one of claims 1-13 is implemented.

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