WO2025218573A1 - Channel state information reporting method and communication apparatus - Google Patents

Abstract

Provided in the present application are a channel state information reporting method and a communication apparatus, which can reduce feedback overheads and can be applied to a communication system. The method comprises: receiving a reference signal; and on the basis of the reference signal, sending channel state information (CSI), which CSI comprises first information and second information, wherein the first information is used for indicating the number of a plurality of spatial domain vectors, and the second information is used for indicating a correspondence between each spatial domain vector among the plurality of spatial domain vectors and a transmission layer among K transmission layers, K being a positive integer greater than or equal to 5, each spatial domain vector at least corresponding to one transmission layer among the K transmission layers, and at least one spatial domain vector among the plurality of spatial domain vectors corresponding to two transmission layers among the K transmission layers.

Description

Channel state information reporting method and communication device

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on April 19, 2024, with application number 202410481134.3 and application name “Channel State Information Reporting Method and Communication Device”, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the field of communication technology, and in particular to a channel state information reporting method and a communication device.

Background Art

In a Type I codebook, a terminal can select a set of orthogonal spatial vectors (also called an orthogonal beam group) shared by multiple transmission layers. This orthogonal beam group includes multiple spatial vectors, and any two of the multiple spatial vectors are orthogonal to each other. For multiple transmission layers, each transmission layer corresponds to an orthogonal spatial vector in the orthogonal spatial vector group. This results in high channel state information overhead when indicating the spatial vector corresponding to each transmission layer.

Summary of the Invention

The embodiments of the present application provide a channel state information reporting method and a communication device, which can reduce the overhead of CSI reporting.

To achieve the above objectives, this application adopts the following technical solutions:

In a first aspect, a channel state information reporting method is provided. The channel state information reporting method includes: a first device receives a reference signal. The first device sends channel state information based on the reference signal, where the channel state information includes first information and second information, the first information being used to indicate the number of multiple spatial domain vectors, and the second information being used to indicate a correspondence between each spatial domain vector in the multiple spatial domain vectors and a transmission layer in K transmission layers, where K is a positive integer greater than or equal to 5, each spatial domain vector corresponds to at least one transmission layer in the K transmission layers, and at least one spatial domain vector in the multiple spatial domain vectors corresponds to two transmission layers in the K transmission layers.

Based on the channel state information reporting method provided in the first aspect, the first device can receive a reference signal and transmit channel state information indicating the number of spatial vectors and the correspondence between the spatial vectors and transmission layers. Each of the multiple spatial vectors corresponds to at least one transmission layer. In this way, indication can be based on the spatial vector corresponding to the transmission layer, reducing redundancy in information used to indicate the spatial vector, thereby reducing channel state information reporting overhead.

In addition, in the embodiment of the present application, when the number of ports is large, the matching degree between the spatial vector and the channel can be improved, thereby improving the accuracy of the codebook.

In one possible implementation, the first information is carried in the first part of the channel state information. In this way, resources reserved for the second part can be reduced, thereby further reducing overhead.

In one possible implementation, the second information is carried in the second part of the channel state information. Because the second information is related to the number of transmission layers and has variable overhead, carrying the second information in the second part can ensure that the resources occupied by the second information match the second information, avoiding resource waste caused by reserving too many resources in the first part and reducing overhead.

In addition, when the first information is carried in the first part of the channel state information, the efficiency of CSI reporting can be improved, thereby improving system performance.

In one possible implementation, the number of spatial vectors in the plurality of spatial vectors is related to K. In this way, the number of spatial vectors can be more closely matched with the number of transmission layers, further reducing overhead.

In a possible implementation, the number of multiple spatial vectors satisfies the following relationship: Wherein, L is the number of the plurality of spatial vectors, and L is an integer greater than 2. In this way, the redundancy of the information used to indicate the spatial vectors in the CSI can be further reduced, and the overhead can be further reduced.

In one possible implementation, K is an even number, and Each of the multiple spatial vectors corresponds to two of the K transmission layers, and each spatial vector corresponds to a different transmission layer. This reduces the redundancy of information used to indicate the spatial vector in the CSI, further reducing overhead.

In one possible implementation, K = 6, where K transmission layers correspond to four spatial vectors. The first spatial vector corresponds to the first and second transmission layers, the second spatial vector corresponds to the third and fourth transmission layers, the third spatial vector corresponds to the fifth transmission layer, and the fourth spatial vector corresponds to the sixth transmission layer. In this way, adjacent transmission layers correspond to the same spatial vector. Because the channel information of adjacent transmission layers is relatively close, the calculated codebook can be more accurate and better match the channel conditions, thereby improving transmission performance.

In one possible implementation, K is an odd number, and a first spatial vector among the multiple spatial vectors corresponds to one transmission layer. Each spatial vector among the multiple spatial vectors, except the first spatial vector, corresponds to two transmission layers. This reduces the redundancy of information indicating the spatial vector in the CSI, further reducing overhead.

In one possible implementation, K = 5, where K transmission layers correspond to four spatial vectors. The first spatial vector corresponds to the first and second transmission layers, the second spatial vector corresponds to the third transmission layer, the third spatial vector corresponds to the fourth transmission layer, and the fourth spatial vector corresponds to the fifth transmission layer. In this way, adjacent transmission layers correspond to the same spatial vector. Because the channel information of adjacent transmission layers is relatively close, the calculated codebook can be more accurate and better match the channel conditions, thereby improving transmission performance.

In one possible implementation, the channel state information further includes third information. The third information is used to indicate the inter-polarization phase difference of at least one transmission layer among the transmission layers corresponding to each of the multiple spatial vectors. In this way, when the spatial vectors correspond to two transmission layers, the inter-polarization phase difference of only one transmission layer may be indicated, thereby reducing overhead.

In one possible implementation, the third information is carried in the second part of the channel state information. Because the second information is related to the number of transmission layers and has a variable overhead, carrying the second information in the second part can ensure that the resources occupied by the second information match the second information, avoiding resource waste caused by reserving too many resources in the first part and reducing overhead.

In one possible implementation, the channel state information further includes fourth information, which is used to indicate the correspondence between each of the K transmission layers and the codeword. In this way, codewords can be matched based on the energy of the transmission layer, avoiding the situation where a high-energy transmission layer and a low-energy transmission layer are mapped to the same codeword, resulting in a low channel quality indicator (poor channel quality) for the first codeword, thereby improving transmission performance.

In one possible implementation, the fourth information is carried in the first part of the channel state information. In this way, the resources reserved for the second part can be reduced, thereby further reducing the overhead.

In a second aspect, a channel state information reporting method is provided. The channel state information feedback includes: a second device sending a reference signal. The second device receives the channel state information. The channel state information is determined by the first device based on the reference signal, and the channel state information includes first information and second information, the first information is used to indicate the number of multiple spatial vectors, and the second information is used to indicate the correspondence between each spatial vector in the multiple spatial vectors and a transmission layer in K transmission layers, where K is a positive integer greater than or equal to 5, each spatial vector corresponds to at least one transmission layer in the K transmission layers, and at least one spatial vector in the multiple spatial vectors corresponds to two transmission layers in the K transmission layers.

Based on the channel state information reporting method provided in the second aspect, the second device can transmit a reference signal and receive channel state information obtained based on the reference signal, which is used to indicate the number of spatial vectors and the correspondence between the spatial vectors and transmission layers. Each of the multiple spatial vectors corresponds to at least one transmission layer. In this way, indication can be based on the spatial vector corresponding to the transmission layer, reducing the redundancy of the information used to indicate the spatial vector, thereby achieving the purpose of improving and reducing the channel state information reporting overhead.

In a possible implementation, the first information is carried in a first part of the channel state information.

In a possible implementation, the second information is carried in the second part of the channel state information.

In a possible implementation, the number of spatial domain vectors in the multiple spatial domain vectors is related to K.

In a possible implementation, the number of multiple spatial vectors satisfies the following relationship: Wherein, L is the number of multiple spatial domain vectors, and L is an integer greater than 2.

In one possible implementation, K is an even number, and Each of the multiple spatial vectors corresponds to two transmission layers among the K transmission layers, and each spatial vector corresponds to a different transmission layer.

In one possible implementation, K=6, and K transmission layers correspond to 4 spatial domain vectors, where the first spatial domain vector corresponds to the first and second transmission layers, the second spatial domain vector corresponds to the third and fourth transmission layers, the third spatial domain vector corresponds to the fifth transmission layer, and the fourth spatial domain vector corresponds to the sixth transmission layer.

In one possible implementation, K is an odd number, a first spatial vector among the plurality of spatial vectors corresponds to one transmission layer, and each spatial vector among the plurality of spatial vectors except the first spatial vector corresponds to two transmission layers.

In one possible implementation, K=5, K transmission layers correspond to 4 spatial domain vectors, where the first spatial domain vector corresponds to the first transmission layer and the second transmission layer, the second spatial domain vector corresponds to the third transmission layer, the third spatial domain vector corresponds to the fourth transmission layer, and the fourth spatial domain vector corresponds to the fifth transmission layer.

In a possible implementation, the channel state information further includes third information. The third information is used to indicate an inter-polarization phase difference of at least one transmission layer in the transmission layers corresponding to each of the multiple spatial vectors.

In a possible implementation, the third information is carried in the second part of the channel state information.

In a possible implementation, the channel state information further includes fourth information, where the fourth information is used to indicate a correspondence between each of the K transmission layers and a codeword.

In a possible implementation, the fourth information is carried in the first part of the channel state information.

In addition, the technical effects of the channel state information reporting method of the second aspect can refer to the technical effects of the channel state information reporting method of the first aspect, and will not be repeated here.

According to a third aspect, a method for reporting channel state information is provided. The channel state information feedback includes: a first apparatus receiving a reference signal; the first apparatus transmitting channel state information based on the reference signal; and the channel state information including fourth information indicating a correspondence between each of K transmission layers and a codeword.

In a possible implementation, the channel state information includes a first part, and the fourth information is carried in the first part.

In a fourth aspect, a channel state information reporting method is provided. The channel state information reporting method includes: a first apparatus sending a reference signal; the first apparatus receiving channel state information; the channel state information is determined by the first apparatus based on the reference signal, the channel state information including fourth information indicating a correspondence between each of K transmission layers and a codeword.

Based on the method provided in the fourth aspect, codewords can be matched according to the energy of the transmission layer to avoid mapping the high-energy transmission layer and the low-energy transmission layer to the same codeword, resulting in a low channel quality indication (poor channel quality) of the first codeword, thereby improving transmission performance.

In a possible implementation, the channel state information includes a first part, and the fourth information is carried in the first part. In this way, resources reserved for the second part can be reduced, thereby further reducing overhead.

In addition, the technical effects of the channel state information reporting method described in the fourth aspect can refer to the technical effects of the channel state information reporting method described in the third aspect, and will not be repeated here.

In a fifth aspect, a communication device is provided, which is configured to execute the channel state information reporting method according to any one of the implementations of the first to fourth aspects.

In the present application, the communication device described in the fifth aspect may be a terminal or network device, or a chip (system) or other parts or components, or a device including the terminal or network device. The above-mentioned chip (system) or other parts or components may be provided in the terminal or network device.

It should be understood that the communication device described in the fifth aspect includes a module, unit, or means corresponding to the channel state information reporting method described in any one of the first to fourth aspects above. The module, unit, or means can be implemented by hardware, software, or hardware executing the corresponding software implementation. The hardware or software includes one or more modules or units for performing the functions involved in the channel state information reporting method.

In a sixth aspect, a communication device is provided, comprising: a processor configured to execute the channel state information reporting method according to any one of the possible implementations of the first to fourth aspects.

In one possible design solution, the communication device described in the sixth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the sixth aspect to communicate with other communication devices.

In one possible design, the communication device described in aspect 6 may further include a memory. The memory may be integrated with the processor or provided separately. The memory may be used to store computer programs and/or data related to the channel state information reporting method described in any one of aspects 1 to 4.

In the present application, the communication device described in the sixth aspect may be a terminal or network device, or a chip (system) or other parts or components, or a device including the terminal or network device. The above-mentioned chip (system) or other parts or components may be provided in the terminal or network device.

In a seventh aspect, a communication device is provided. The communication device includes: a processor coupled to a memory, the processor being configured to execute a computer program stored in the memory, so that the communication device performs the channel state information reporting method described in any possible implementation of the first to fourth aspects.

In one possible design solution, the communication device described in the seventh aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the seventh aspect to communicate with other communication devices.

In the present application, the communication device described in the seventh aspect can be a terminal or network device, or a chip (system) or other parts or components, or a device including the terminal or network device. Among them, the above-mentioned chip (system) or other parts or components can be set in the terminal or network device.

In an eighth aspect, a communication device is provided, comprising: a processor and a memory; the memory is used to store a computer program, and when the processor executes the computer program, the communication device executes the channel state information reporting method described in any one of the implementation methods of the first to fourth aspects.

In one possible design solution, the communication device described in the eighth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the eighth aspect to communicate with other communication devices.

In the present application, the communication device described in the eighth aspect may be a terminal or network device, or a chip (system) or other parts or components, or a device including the terminal or network device. The above-mentioned chip (system) or other parts or components may be provided in the terminal or network device.

In the ninth aspect, a communication device is provided, comprising: a processor; the processor is used to couple with a memory, and after reading a computer program in the memory, execute the channel state information reporting method as described in any one of the implementation methods of the first to fourth aspects according to the computer program.

In one possible design solution, the communication device described in aspect 9 may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in aspect 9 to communicate with other communication devices.

In the present application, the communication device described in the ninth aspect may be a terminal or network device, or a chip (system) or other parts or components, or a device including the terminal or network device. The above-mentioned chip (system) or other parts or components may be provided in the terminal or network device.

In a tenth aspect, a processor is provided, wherein the processor is configured to execute the channel state information reporting method described in any possible implementation manner of the first to fourth aspects.

In an eleventh aspect, a communication system is provided, which includes one or more terminals and one or more network devices.

In the twelfth aspect, a computer-readable storage medium is provided, comprising: a computer program or instructions; when the computer program or instructions are run on a computer, the computer executes the channel state information reporting method described in any possible implementation method of the first to fourth aspects.

In the thirteenth aspect, a computer program product is provided, comprising a computer program or instructions, which, when executed on a computer, enables the computer to execute the channel state information reporting method described in any one of the possible implementations of the first to fourth aspects.

In addition, the technical effects of the communication device described in the fifth to thirteenth aspects above can refer to the technical effects of the channel state information reporting method described in the first to fourth aspects above, and will not be repeated here.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a CSI reporting process according to an embodiment of the present application;

FIG2 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

FIG3 is a schematic diagram of terminal interaction provided in an embodiment of the present application;

FIG4 is a flow chart of a method for reporting channel state information according to an embodiment of the present application;

FIG5 is a second flow chart of a channel state information reporting method according to an embodiment of the present application;

FIG6 is a first structural diagram of a communication device provided in an embodiment of the present application;

FIG7 is a second structural diagram of the communication device provided in an embodiment of the present application.

DETAILED DESCRIPTION

The technical terms and related technical solutions in this application will be described below in conjunction with the accompanying drawings.

In a communication system using MIMO technology, the data received by the receiving end of the data (i.e., the first device) may be the data after the transmitting end (i.e., the second device) pre-encodes the data. The second device may pre-encode the data based on the channel state information (CSI) reported by the receiving end of the data. For ease of understanding, the embodiments of the present application are all combined with the first device being a terminal and the second device being a network device, such as a wireless access network device, for example, which will not be described in detail later. It should be understood that in some possible implementation schemes, the second device may be a terminal and the first device may be a network device.

The following first introduces the CSI reporting process provided by the embodiment of the present application.

Please refer to Figure 1, which is a schematic diagram of the CSI reporting process provided in an embodiment of the present application. As shown in Figure 1, the CSI reporting process includes the following steps S101 to S104:

S101: A network device sends channel measurement configuration information to a terminal.

The channel measurement configuration information is used to indicate channel measurement and configuration parameters for the channel measurement, such as parameters for configuring time domain resources and frequency domain resources. For example, the channel measurement configuration information may indicate resources used to carry channel state information reference signals (CSI-RS), i.e., CSI-RS resources.

S102: The network device sends a CSI-RS to the terminal on the CSI-RS resource. Correspondingly, the terminal receives the CSI-RS from the network device on the CSI-RS resource.

In a communication system, such as a new radio (NR) system, a network device sends a CSI-RS on a CSI-RS resource for a terminal to detect a downlink channel, and the terminal receives the CSI-RS on a pre-configured CSI-RS resource to perform channel estimation.

S103: The terminal obtains CSI according to the CSI-RS.

For the implementation principle of S103, reference may be made to the related method for obtaining CSI in the prior art, which will not be repeated here.

S104: The terminal reports the CSI to the network device.

Among them, the CSI includes information for indicating the 3rd Generation Partnership Project (3GPP) Type I codebook. This information can indicate the Type I codebook by indicating the beam information corresponding to each transmission layer in multiple transmission layers, such as the spatial vector.

In a Type I codebook with a large number of transmission layers, the terminal can select a set of orthogonal spatial vectors (also called an orthogonal beam group) shared by multiple transmission layers. The orthogonal beam group includes multiple spatial vectors, and any two of the multiple spatial vectors are orthogonal to each other. For multiple transmission layers, each transmission layer corresponds to an orthogonal spatial vector in the orthogonal beam group.

For example, if the orthogonal spatial vector group includes five spatial vectors, namely spatial vector 1 to spatial vector 4, and the transmission layers include four transmission layers, namely transmission layers 1 to 4, then the CSI must indicate which of the five spatial vectors the selected transmission layer is. This results in high overhead when the channel state information indicates the spatial vector corresponding to each transmission layer.

In addition, in Type I codebook feedback, the mapping relationship between codewords and transport layers is agreed upon by the protocol and is relatively fixed. This will cause the high-energy transport layer and the low-energy transport layer to be mapped to the same codeword, resulting in a low channel quality indication (poor channel quality) for the first codeword, which will lead to low transmission performance.

It should be understood that the transport layer is relative to the terminal and network equipment. A spatial vector group can also be called a spatial vector set. For example, an orthogonal spatial vector group can also be called an orthogonal spatial vector set, which will not be described in detail later.

The technical solution in this application will be described below with reference to the accompanying drawings.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as wireless fidelity (WiFi) systems, vehicle-to-everything (V2X) communication systems, device-to-device (D2D) communication systems, Internet of Vehicles communication systems, 4th generation (4G) mobile communication systems such as long term evolution (LTE) systems, worldwide interoperability for microwave access (WiMAX) communication systems, 5th generation (5G) mobile communication systems such as new radio (NR) systems, and future communication systems such as 6th generation (6G) mobile communication systems.

This application will present various aspects, embodiments, or features in the context of systems that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and/or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. Furthermore, combinations of these aspects may also be used.

Additionally, in the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as an "exemplary" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner.

First, in this application, "used to indicate" can include being used for direct indication and being used for indirect indication. When describing a certain "information" as being used to indicate A, it can include whether the information directly indicates A or indirectly indicates A, but it does not necessarily mean that the information contains A.

The information indicated by a message is called information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, where there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can be achieved by means of the arrangement order of each piece of information agreed in advance (such as specified in the protocol), thereby reducing the indication overhead to a certain extent. At the same time, the common parts of each piece of information can be identified and indicated uniformly to reduce the indication overhead caused by indicating the same information separately.

In addition, the specific indication method can also be various existing indication methods, such as but not limited to the above-mentioned indication methods and various combinations thereof. The specific details of the various indication methods can be referred to the prior art and will not be repeated herein. As can be seen from the above, for example, when it is necessary to indicate multiple information of the same type, there may be a situation where the indication methods for different information are different. In the specific implementation process, the required indication method can be selected according to specific needs. The embodiment of the present application does not limit the selected indication method. In this way, the indication method involved in the embodiment of the present application should be understood to cover various methods that can enable the party to be indicated to obtain the information to be indicated.

The information to be indicated can be sent as a whole, or divided into multiple sub-information and sent separately, and the sending period and/or sending time of these sub-information can be the same or different. The specific sending method is not limited in this application. Among them, the sending period and/or sending time of these sub-information can be pre-defined, for example, pre-defined according to the protocol, or configured by the transmitting device by sending configuration information to the receiving device. Among them, the configuration information can, for example, but not limited to, include one or a combination of at least two of radio resource control (RRC) signaling, medium access control (MAC) layer signaling and physical layer signaling. Among them, MAC layer signaling, for example, includes MAC control element (CE); physical (PHY) layer signaling, for example, includes downlink control information (DCI).

Second, in the embodiments shown below, the first, second, and various numerical numbers are only used for the convenience of description and are not intended to limit the scope of the embodiments of the present application.

Third, “pre-set”, or “pre-defined”, or “pre-configured” can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a terminal and a network device), or can be pre-specified in a protocol, and this application does not limit its specific implementation method. Among them, “saving” can mean saving in one or more memories. The one or more memories can be set separately, or integrated in an encoder or decoder, a processor, or a communication device. The one or more memories can also be partially set separately, and partially integrated in a decoder, a processor, or a communication device. The type of memory can be any form of storage medium, and this application does not limit it.

Fourth, the "protocol" involved in the embodiments of the present application may refer to a standard protocol in the field of communications, for example, it may include 3GPP's LTE protocol (such as technical specification (TS) 36, i.e., the TS36 series of technical specifications), NR protocol (such as the TS38 series of technical specifications) and related protocols used in future communication systems, and this application does not limit this.

The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first described in detail using the communication system shown in Figure 2 as an example. For example, Figure 2 is a schematic diagram of the architecture of a communication system applicable to the method provided in the embodiments of the present application.

As shown in FIG2 , the communication system includes network equipment and terminals.

Exemplarily, the network devices may include network devices 201a to 201c, and the terminals may include terminals 202a to 202f. The terminals may be connected to the network devices wirelessly, and the network may be connected to the core network (not shown in FIG. 2 ) via wired or wireless means.

Among them, network devices and terminals can interact with each other.

The terminal may be a terminal with transceiver functions, or may be a chip or chip system provided at the terminal. The terminal may also be referred to as user equipment (UE), access terminal, subscriber unit, user station, mobile station (MS), mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal in the embodiment of the present application may be a mobile phone, a cellular phone, a smart phone, a tablet computer, a wireless data card, a personal digital assistant (PDA), a wireless modem, a handheld device, a laptop computer, a machine type communication (MTC) terminal, a computer with wireless transceiver functions, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a smart home device, or a similar device. The terminal of the present application may also be an on-board module, on-board module, on-board component, on-board chip or on-board unit that is built into a vehicle as one or more components or units. The terminal may also be other devices with terminal functions. For example, the terminal may be a device that functions as a terminal in D2D communication. The embodiments of this application do not limit the device form factor of the terminal. The device used to implement the terminal's function can be a terminal; it can also be a device that supports the terminal in implementing the function, such as a chip system. The device can be installed in the terminal or used in conjunction with the terminal. In the embodiments of this application, the chip system can be composed of a chip or include a chip and other discrete components.

A network device may be a device with wireless transceiver functions, or may be a chip or chip system provided in the device, located in the access network (AN) of a communication system, and used to provide access services to terminals. For example, a network device may be referred to as a radio access network (RAN) device, and may specifically be an access network device of a next-generation mobile communication system, such as 6G, such as a 6G base station. In the next-generation mobile communication system, network devices may also have other naming methods, all of which are covered by the protection scope of the embodiments of this application, and this application does not impose any limitation on this. Alternatively, the network device may include 5G, such as a gNB in a new radio (NR) system, or one or a group of antenna panels (including multiple antenna panels) of a 5G base station, or a network node constituting a gNB, a transmission and reception point (TRP or TP), or a transmission measurement function (TMF), such as a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), a radio unit (RU), an RSU with base station functionality, a wired access gateway, or a 5G core network element. Alternatively, the network device may include an access point (AP) in a wireless fidelity (WiFi) system, a wireless relay node, a wireless backhaul node, various types of macro base stations, micro base stations (also known as small cells), relay stations, access points, wearable devices, in-vehicle devices, etc.

The CU and DU can be configured separately or included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). It is understood that a network device can be a CU node, a DU node, or a device including both a CU node and a DU node. Furthermore, the CU can be classified as a network device in the access network (RAN) or a network device in the core network (CN), without limitation. In different systems, the CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meanings. For example, in an ORAN system, the CU may be referred to as an O-CU (Open CU), the DU may be referred to as an O-DU, the CU-CP may be referred to as an O-CU-CP, the CU-UP may be referred to as an O-CU-UP, and the RU may be referred to as an O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. In the embodiment of the present application, the form of the network device is not limited. The device for implementing the function of the network device can be a network device; it can also be a device that can support the network device to implement the function, such as a chip system. The device can be installed in the network device or used in combination with the network device.

As shown in Figure 3, the network device includes an RRC signaling interaction module (RRC in Figure 3), a MAC signaling interaction module (MAC in Figure 3), and a PHY signaling and data interaction module (PHY in Figure 3). The terminal also includes an RRC signaling interaction module, a MAC signaling interaction module, and a PHY signaling and data interaction module.

The RRC signaling interaction module allows network devices and terminals to exchange RRC signaling. The MAC signaling interaction module allows network devices and terminals to exchange media access control element (MAC CE) signaling. The PHY interaction module allows network devices and terminals to exchange one or more of the following: uplink control signaling, downlink control signaling (such as DCI), uplink data, and downlink data.

It should be noted that the beam management method provided in the embodiment of the present application can be applied to the nodes shown in Figure 2, such as between the terminal and the network device. The specific implementation can refer to the following method embodiment, which will not be repeated here.

It should be noted that the solutions in the embodiments of the present application can also be applied to other communication systems, and the corresponding names can also be replaced by the names of corresponding functions in other communication systems.

It should be understood that FIG2 is only a simplified schematic diagram for ease of understanding, and the communication system may also include other network devices and/or other terminals, which are not shown in FIG2 .

The channel state information reporting method provided in the embodiment of the present application will be described in detail below with reference to FIG. 4-FIG . 5 .

For example, Figure 4 is a flow chart of a channel state information reporting method according to an embodiment of the present application. The channel state information reporting method may be applicable to the communication between the terminal and the network device shown in Figure 2 .

As shown in FIG4 , the channel state information reporting method includes the following steps:

In step S401, a second device sends a reference signal (RS). In response, a first device receives the reference signal.

The reference signal may be a CSI-RS or other possible reference signals, which is not limited in the embodiment of the present application.

The first device may be a terminal in the communication system provided in FIG. 2 , and the second device may be a network device in the communication system provided in FIG. 2 .

S402: The first device sends channel state information according to a reference signal, and the second device receives the channel state information accordingly.

The channel state information includes first information and second information. The first information is used to indicate the number of multiple spatial vectors, and the second information is used to indicate the correspondence between each spatial vector in the multiple spatial vectors and a transmission layer in K transmission layers. Each spatial vector corresponds to at least one transmission layer in the K transmission layers, and at least one spatial vector in the multiple spatial vectors corresponds to two transmission layers in the K transmission layers.

It should be understood that the number of transmission layers corresponding to any one of the multiple spatial vectors is a positive integer less than or equal to 2.

K can be understood as the number of transmission layers. The number of transmission layers is determined based on the measurement results of the reference signal and is not described in detail here. In some embodiments, K is a positive integer greater than or equal to 5. For example, K = 5, or K = 6, or K = 7, or K = 8.

In some embodiments, K may be an integer greater than or equal to 2 and less than or equal to 4. For example, K=2, or K=3, or K=4.

It should be understood that the value of K here is used as an example. In actual implementation, K can also have other values, such as K can be an integer greater than 8.

In one possible implementation, the number of spatial vectors in the plurality of spatial vectors is related to K. In other words, the number of spatial vectors in the plurality of spatial vectors is determined based on the number of transmission layers. This allows the number of spatial vectors to more closely match the number of transmission layers, further reducing overhead.

Wherein, L is the number of multiple spatial vectors, each of which has a corresponding transmission layer. Any two of the multiple spatial vectors are mutually orthogonal. L is an integer greater than 2. In the embodiment of the present application, L can be determined by the terminal device.

In the embodiment of the present application, the number of the plurality of spatial vectors may be the spatial vectors in all spatial vectors (hereinafter referred to as a first spatial vector group) determined based on the number of ports in the first direction, the number of ports in the second direction, the oversampling factor in the first direction, and the oversampling factor corresponding to the second direction. Non-orthogonal spatial vectors may exist in the first spatial vector group.

It should be understood that the two spatial vectors in the embodiment of the present application are orthogonal, and also include that the inner product of the two spatial vectors is less than the interference threshold. The interference threshold may be scenario-specific. For high-quality, low-latency communications, the interference threshold is set to a smaller value, the communication quality requirements are not so high, and the interference threshold is large. Optionally, the two spatial vectors are orthogonal, which may mean that the inner product of the two spatial vectors is 0. In the embodiment of the present application, one spatial vector corresponds to one beam direction.

In a possible implementation, the number of the spatial vectors in the plurality of spatial vectors (hereinafter referred to as the number of the spatial vectors) satisfies the relationship shown in the following formula (1):

The following explains the different situations.

Case 1: The number of spatial vectors satisfies the relationship shown in the following formula (2):

In this way, the redundancy of the information used to indicate the spatial vector in the channel state information can be further reduced, and the overhead can be further reduced. In this case, if K=5, L=3; or, K=6, L=3; or, K=7, L=4; or, K=8, L=4.

Case 2: The number of spatial vectors satisfies the relationship shown in the following formula (3):

Here, m is a positive integer such that L<K. For example, m=1. In this case, if K=5, L=4; or, if K=6, L=4.

It should be understood that the number of spatial vectors involved in the above formulas (2) and (3) is only used as an example. In actual implementation, the number of spatial vectors can also be other possible relationships that satisfy formula (1), which will not be repeated here.

The correspondence between each of the multiple spatial vectors and a transmission layer in the K transmission layers (hereinafter referred to as the first correspondence) can be one of the following three correspondences:

Correspondence relationship 1: K is an even number, each of the multiple spatial vectors corresponds to two transmission layers in the K transmission layers, and each spatial vector corresponds to a different transmission layer. For example, the number of spatial vectors is as shown in case 1, and (For example, K=6, L=3; or, K=8, L=4), then the first corresponding relationship satisfies corresponding relationship 1.

In this way, the redundancy of information used to indicate the spatial vector in the CSI can be reduced, further reducing the overhead.

Correspondence Relationship 2: K is an odd number. Among the multiple spatial vectors, there is a first spatial vector that corresponds to one transmission layer. Each spatial vector in the multiple spatial vectors, except the first spatial vector, corresponds to two transmission layers. For example, if the number of spatial vectors is as shown in Case 1 and K is an odd number, such as K = 5 and L = 3, or K = 7 and L = 4, the first correspondence relationship satisfies Correspondence Relationship 2.

In this way, the redundancy of information used to indicate the spatial vector in the CSI can be reduced, further reducing the overhead.

Correspondence Relationship 3: At least one second spatial vector among the multiple spatial vectors corresponds to two transmission layers, and each spatial vector among the multiple spatial vectors except the second spatial vector corresponds to one transmission layer. For example, if the number of spatial vectors is as shown in Case 2, such as m = 1, K = 5, L = 4; or K = 6, L = 4, the first correspondence relationship satisfies Correspondence Relationship 3.

In an embodiment of the present application, the second information may indicate the correspondence between each of the multiple spatial vectors and the transmission layer in the K transmission layers by direct indication. For example, the second information may indicate the spatial vector corresponding to each transmission layer, or indicate the transmission layer corresponding to each spatial vector. Alternatively, the second information may indicate the correspondence between each of the multiple spatial vectors and the transmission layer in the K transmission layers by indirect indication. For example, the second information may include a codebook determined based on a reference signal, the structure of the codebook being used to indicate the correspondence between the spatial vector and the transmission layer. It should be understood that the codebook in the embodiment of the present application may also be referred to as a precoding matrix indication (PMI) codebook.

In a possible implementation, the first corresponding relationship may be determined according to the index size of the transmission layer and the size of the index of the spatial vector, such as the spatial vector corresponding to each transmission layer.

In one possible implementation, the first device may determine a transmission layer from the first spatial vector group as the spatial vector corresponding to each transmission layer corresponding to a spatial vector, and determine a transmission layer from the first spatial vector group as the transmission layer corresponding to two transmission layers corresponding to the same spatial vector.

In this case, in some possible embodiments, the second device and the first device may be pre-configured with a transmission layer corresponding to the same spatial vector.

For ease of understanding, the first corresponding relationship is illustrated below with examples of K=5, or K=6, or K=7, or K=8, and L=3 or L=4.

Example 1: Assume L=3, K=5.

Example 1.1: The first and second transmission layers correspond to the same spatial vector; the third and fourth transmission layers correspond to the same spatial vector; the fifth transmission layer corresponds to a spatial vector, and the spatial vectors corresponding to the first, third, and fifth transmission layers are different. For example, if the spatial vectors include the first to third spatial vectors, then in the first correspondence, the first and second transmission layers both correspond to the first spatial vector, the third and fourth transmission layers both correspond to the second spatial vector, and the fifth transmission layer corresponds to the third spatial vector. In this case, if the first correspondence is indirectly indicated by a codebook, the codebook structure can satisfy the following formula (4):

in, is the inter-polarization phase, v _l,m is the first spatial vector, v _l′,m′ is the second spatial vector, and v _l″,m″ is the fourth spatial vector.

Example 1.2: The first transmission layer corresponds to a spatial vector, the second and third transmission layers correspond to the same spatial vector, and the fourth and fifth transmission layers correspond to the same spatial vector.

For example, if the spatial vector includes the first spatial vector to the third spatial vector, then in the first correspondence, the first transmission layer corresponds to the first spatial vector, the second and third transmission layers correspond to the second spatial vector, and the fourth and fifth transmission layers correspond to the third spatial vector. In this case, if the first correspondence is indirectly indicated by the codebook, the codebook structure can satisfy the following formula (5):

In Example 1.3, the first, second, and third transmission layers each use three different spatial vectors. The spatial vectors corresponding to the fourth and fifth transmission layers are the same as the spatial vector corresponding to the first, second, or third transmission layers, and the spatial vectors corresponding to the fourth and fifth transmission layers are different.

For example, if the spatial vector includes the first to third spatial vectors, then the first and fourth transmission layers correspond to the first spatial vector, the second and fifth transmission layers correspond to the second spatial vector, and the third transmission layer corresponds to the third spatial vector. In this case, if the first correspondence is indirectly indicated by the codebook, the codebook structure can satisfy the following formula (6):

Example 2: Assume L=4, K=5.

Example 2.1: The first and second transmission layers correspond to the same spatial vector; the third transmission layer corresponds to a spatial vector; the fourth transmission layer corresponds to a spatial vector; the fifth transmission layer corresponds to a spatial vector; the spatial vectors corresponding to any two transmission layers among the first, third, fourth, and fifth transmission layers are different.

For example, if the spatial vector includes the first spatial vector to the fourth spatial vector, then the first transmission layer and the second transmission layer correspond to the first spatial vector, the third transmission layer corresponds to the second spatial vector, the fourth transmission layer corresponds to the third spatial vector, and the fifth transmission layer corresponds to the fourth spatial vector. In this case, if the first correspondence is indirectly indicated by the codebook, the codebook structure can satisfy the following formula (7):

In this way, adjacent transmission layers correspond to the same spatial vector. Since the channel information of adjacent transmission layers is relatively close, the calculated codebook can be more accurate and more compatible with the channel conditions, thereby improving transmission performance.

Example 2.2: The spatial vectors corresponding to any two transmission layers from the first to the fourth transmission layer are different, and the spatial vector corresponding to the fifth transmission layer is the same as the spatial vector corresponding to one transmission layer from the first to the fourth transmission layer;

For example, if the spatial vector includes the first spatial vector to the fourth spatial vector, then the first transmission layer and the fifth transmission layer correspond to the first spatial vector, the second transmission layer corresponds to the second spatial vector, the third transmission layer corresponds to the third spatial vector, and the fourth transmission layer corresponds to the fourth spatial vector. In this case, if the first correspondence is indirectly indicated by the codebook, the codebook structure can satisfy the following formula (8):

Example 3: Assume L=3, K=6.

Example 3.1: The first and second transmission layers correspond to the same spatial vector, the third and fourth transmission layers correspond to the same spatial vector, the fifth and sixth transmission layers correspond to the same spatial vector, and the spatial vectors corresponding to any two transmission layers among the first, third, and fifth transmission layers are different.

For example, if the spatial vector includes the first spatial vector to the third spatial vector, then the first transmission layer and the second transmission layer correspond to the first spatial vector, the second transmission layer and the third transmission layer correspond to the second spatial vector, and the fifth transmission layer and the sixth transmission layer correspond to the third spatial vector. In this case, if the first corresponding relationship is indirectly indicated by the codebook, the codebook structure can satisfy the following formula (9):

In Example 3.2, the first to third transmission layers correspond to different spatial vectors, and the spatial vectors corresponding to the fourth to sixth transmission layers are respectively the same as the spatial vectors corresponding to the first to third transmission layers.

For example, if the spatial vector includes the first to third spatial vectors, then the first and fourth transmission layers correspond to the first spatial vector, the second and fifth transmission layers correspond to the second spatial vector, and the third and sixth transmission layers correspond to the third spatial vector. In this case, if the first correspondence is indirectly indicated by the codebook, the codebook structure can satisfy the following formula (10):

Example 4: Assume L=4, K=6.

Example 4.1: The first and second transmission layers correspond to the same spatial vector, the third and fourth transmission layers correspond to the same spatial vector, the fifth transmission layer corresponds to a spatial vector, and the sixth transmission layer corresponds to a spatial vector, and the spatial vectors corresponding to any two transmission layers among the first, third, fifth, and sixth transmission layers are different.

For example, if the spatial vector includes the first to fourth spatial vectors, then the first and second transmission layers correspond to the first spatial vector, the third and fourth transmission layers correspond to the second spatial vector, the fifth transmission layer corresponds to the third spatial vector, and the sixth transmission layer corresponds to the fourth spatial vector. In this case, if the first correspondence is indirectly indicated by a codebook, the codebook structure can be shown as follows:

In this way, adjacent transmission layers correspond to the same spatial vector. Since the channel information of adjacent transmission layers is relatively close, the calculated codebook can be more accurate and more compatible with the channel conditions, thereby improving transmission performance.

Example 4.2: The first transmission layer corresponds to a spatial vector, the second transmission layer corresponds to a spatial vector, the third transmission layer and the fourth transmission layer correspond to the same spatial vector, the fifth transmission layer and the sixth transmission layer correspond to the same spatial vector, and the spatial vectors corresponding to any two transmission layers among the first transmission layer, the second transmission layer, the third transmission layer and the fifth transmission layer are different.

For example, if the spatial vector includes the first spatial vector to the fourth spatial vector, then the first transmission layer corresponds to the first spatial vector, the second transmission layer corresponds to the second spatial vector, the third and fourth transmission layers correspond to the third spatial vector, and the fifth and sixth transmission layers correspond to the fourth spatial vector. In this case, if the first correspondence is indirectly indicated by the codebook, the codebook structure can be shown as follows:

Example 4.3: The spatial domain vectors corresponding to the 1st to 4th transmission layers are different, the spatial domain vector corresponding to the 5th transmission layer is the same as the spatial domain vector corresponding to one of the 1st to 4th transmission layers, the spatial domain vector corresponding to the 6th transmission layer is the same as the spatial domain vector of one of the 1st to 4th transmission layers, and the spatial domain vector corresponding to the 5th transmission layer is different from the spatial domain vector corresponding to the 6th transmission layer.

For example, if the spatial vector includes the first to fourth spatial vectors, then the first and fifth transmission layers correspond to the first spatial vector, the second and sixth transmission layers correspond to the second spatial vector, the third transmission layer corresponds to the third spatial vector, and the fourth transmission layer corresponds to the fourth spatial vector. In this case, if the first correspondence is indirectly indicated by a codebook, the codebook structure can be shown as follows:

Example 5: Assume L=4, K=7.

Example 5.1: The first and second transmission layers correspond to the same spatial vector; the third and fourth transmission layers correspond to the same spatial vector; the fifth and sixth transmission layers correspond to the same spatial vector; the seventh transmission layer corresponds to a spatial vector, and the first, third, fifth, and seventh transmission layers each correspond to a different spatial vector.

For example, if the spatial vector includes the first spatial vector to the fourth spatial vector, then the first transmission layer and the second transmission layer correspond to the first spatial vector, the third transmission layer and the fourth transmission layer correspond to the second spatial vector, the fifth transmission layer and the sixth transmission layer correspond to the third spatial vector, and the seventh transmission layer corresponds to the fourth spatial vector. In this case, if the first correspondence is indirectly indicated by the codebook, then the codebook structure can satisfy the following formula (14):

Example 5.2: The first transmission layer corresponds to a spatial vector that is different from that of other layers. The second and third transmission layers correspond to the same spatial vector. The fourth and fifth transmission layers correspond to the same spatial vector. The sixth and seventh transmission layers correspond to the same spatial vector. The first, second, fourth, and sixth transmission layers each correspond to a different spatial vector.

For example, if the spatial vector includes the first to fourth spatial vectors, then the first transmission layer corresponds to the first spatial vector, the second and third transmission layers correspond to the second spatial vector, the fourth and fifth transmission layers correspond to the third spatial vector, and the sixth and seventh transmission layers correspond to the fourth spatial vector. In this case, if the first correspondence is indirectly indicated by a codebook, the codebook structure can be shown as follows:

Example 5.3: The first to fourth transmission layers each correspond to a different spatial vector. The spatial vector corresponding to the fifth transmission layer is the same as the spatial vector corresponding to the first transmission layer. The spatial vector corresponding to the sixth transmission layer is the same as the spatial vector corresponding to the second transmission layer. The spatial vector corresponding to the seventh transmission layer is the same as the spatial vector corresponding to the third transmission layer.

For example, if the spatial vector includes the first to fourth spatial vectors, then the first and fifth transmission layers correspond to the first spatial vector, the second and sixth transmission layers correspond to the second spatial vector, the third and seventh transmission layers correspond to the third spatial vector, and the fourth transmission layer corresponds to the fourth spatial vector. In this case, if the first correspondence is indirectly indicated by a codebook, the codebook structure can be shown as follows:

Example 6: Assume L=4, K=8.

Example 6.1: The first and second transmission layers correspond to the same spatial vector; the third and fourth transmission layers correspond to the same spatial vector; the fifth and sixth transmission layers correspond to the same spatial vector; the seventh and eighth transmission layers correspond to the same spatial vector, and the first, third, fifth, and seventh transmission layers each correspond to a different spatial vector.

For example, if the spatial vector includes the first spatial vector to the fourth spatial vector, then the first transmission layer and the second transmission layer correspond to the first spatial vector, the third transmission layer and the fourth transmission layer correspond to the second spatial vector, the fifth transmission layer and the sixth transmission layer correspond to the third spatial vector, and the seventh transmission layer and the eighth transmission layer correspond to the fourth spatial vector. In this case, if the first correspondence is indicated by the codebook, the codebook structure can satisfy the following formula (17):

Example 6.2: The first to fourth transmission layers each correspond to a different spatial vector. The spatial vector corresponding to the fifth transmission layer is the same as the spatial vector corresponding to the first transmission layer. The spatial vector corresponding to the sixth transmission layer is the same as the spatial vector corresponding to the second transmission layer. The spatial vector corresponding to the seventh transmission layer is the same as the spatial vector corresponding to the third transmission layer. The spatial vector corresponding to the eighth transmission layer is the same as the spatial vector corresponding to the fourth transmission layer.

For example, if the spatial vector includes the first spatial vector to the fourth spatial vector, then the first transmission layer and the fifth transmission layer correspond to the first spatial vector, the second transmission layer and the sixth transmission layer correspond to the second spatial vector, the third transmission layer and the seventh transmission layer correspond to the third spatial vector, and the fourth transmission layer and the eighth transmission layer correspond to the fourth spatial vector. In this case, if the first correspondence is indicated by the codebook, the codebook structure can satisfy the following formula (18):

In the embodiment of the present application, for the above-mentioned inter-polarization phase If K is an odd number, the transport layer Quantization can be done based on quadrature phase shift keying (QPSK), for example Or based on binary phase shift keying (BPSK) quantization, in this case In addition, the inter-polarization phases of the two transmission layers corresponding to the same spatial vector can also be quantized by QPSK or BPSK, that is, or The quantization bits of QPSK and the quantization bits of BPSK may be the same or different.

In a possible implementation, the inter-polarization phase difference between two transmission layers corresponding to the same spatial vector is π.

In some possible implementations, π may be preconfigured in the second device. In this case, the channel state information reference signal may further include third information. The third information is used to indicate the inter-polarization phase difference of at least one transmission layer in the transmission layers corresponding to each spatial vector in the multiple spatial vectors. It should be understood that each phase in the third information may be indicated by one or two bits.

In this way, when the same spatial vector corresponds to two transmission layers, only the inter-polarization phase difference of one transmission layer corresponding to the spatial vector may be indicated, thereby further reducing overhead.

It should be understood that the third information may also be used to indicate the inter-polarization phase difference of the transmission layer corresponding to each spatial vector in the multiple spatial vectors.

Optionally, the third information may be carried in the second part of the channel state information.

It is understood that when K is an integer greater than or equal to 2 and less than or equal to 4, L may be 1 or 2. For example, K=2, L=1; or K=3, L=2; or K=4, L=2; or K=4, L=3.

If K = 2 and L = 1, then two transmission layers correspond to one spatial vector. For example, the K transmission layers include the first transmission layer and the second transmission layer, the multiple spatial vectors include the first spatial vector, and both the first transmission layer and the second transmission layer correspond to the first spatial vector.

If K = 3 and L = 2, then two of the three transmission layers correspond to one spatial vector, and the other transmission layer corresponds to another spatial vector. For example, the K transmission layers include the first and second transmission layers, and the multiple spatial vectors include the first to third spatial vectors. The first and second transmission layers both correspond to the first spatial vector, and the third transmission layer corresponds to the second spatial vector.

If K = 4 and L = 2, then any two of the four transmission layers correspond to one of the two spatial vectors, and the other two of the four transmission layers correspond to the other of the two spatial vectors. For example, the K transmission layers include the 1st to 4th transmission layers, the multiple spatial vectors include the 1st spatial vector and the 2nd spatial vector, the 1st and 2nd transmission layers both correspond to the 1st spatial vector, and the 3rd and 4th transmission layers correspond to the 2nd spatial vector.

If K = 4 and L = 3, then any two of the four transmission layers correspond to one of the two spatial vectors, and the other two of the four transmission layers each correspond to one of the remaining three spatial vectors. For example, if the K transmission layers include the 1st to 4th transmission layers, and the multiple spatial vectors include the 1st to 3rd spatial vectors, the 1st and 2nd transmission layers each correspond to the 1st spatial vector, the 3rd transmission layer corresponds to the 2nd spatial vector, and the 4th transmission layer corresponds to the 3rd spatial vector.

It should be understood that the number of transmission layers can also be understood as the rank of the channel between the first device and the second device, or the number of transmission streams. The rank of the channel can be represented by a rank indication (RI). The spatial vector corresponding to a transmission layer means that data on the transmission layer can be transmitted in the beam direction corresponding to the spatial vector.

In the embodiment of the present application, the kth transport layer among the K transport layers can be understood as the transport layer with index k (the index of the first transport layer is 1). In this case, the first transport layer can also be referred to as transport layer 1 or layer 1, the second transport layer can also be referred to as transport layer 2 or layer 2, the third transport layer can also be referred to as transport layer 3 or layer 3, the fourth transport layer can also be referred to as transport layer 4 or layer 4, the fifth transport layer can also be referred to as transport layer 5 or layer 5, the sixth transport layer can also be referred to as transport layer 6 or layer 6, the seventh transport layer can also be referred to as transport layer 7 or layer 7, and the eighth transport layer can also be referred to as transport layer 8 or layer 8.

The lth spatial vector among the L spatial vectors can be understood as the spatial vector with index l (the index of the first spatial vector is 1). In this case, the first spatial vector can also be called spatial vector one, the second spatial vector can also be called spatial vector two, the third spatial vector can also be called spatial vector three, and the fourth spatial vector can also be called spatial vector four.

Alternatively, in some scenarios, the kth transport layer among the K transport layers can be understood as the transport layer with index k-1 (the index of the first transport layer is 0). Similarly, the lth spatial vector among the L spatial vectors can be understood as the spatial vector with index l+1 (the index of the first spatial vector is 0), which will not be further described.

It is understandable that, for the second terminal device, the channel state information is determined by the first device according to the reference signal.

In a possible implementation, the channel state information may include a first part and a second part.

In this case, in a possible implementation, the first information is carried in the first part of the channel state information, so that the resources reserved for the second part can be reduced, thereby further reducing the overhead.

In one possible implementation, the second information is carried in the second part of the channel state information. Because the second information is related to the number of transmission layers and has variable overhead, carrying the second information in the second part can ensure that the resources occupied by the second information match the second information, avoiding resource waste caused by reserving too many resources in the first part and reducing overhead.

In addition, when the first information is carried in the first part of the channel state information, the efficiency of CSI reporting can be improved, thereby improving system performance.

In a possible implementation, the channel state information may further include fifth information. The fifth information is also used to indicate the set of spatial vectors selected by the terminal. Optionally, the fifth information may be carried in the first part and/or the second part of the channel state information. The fifth information occupies bits. _O1 is the oversampling multiple in a first direction (such as the horizontal direction), and _O2 is the oversampling multiple in a second direction (such as the vertical direction). The first direction and the second direction are perpendicular to each other.

Optionally, the number of bits occupied by the information used to indicate the spatial vector corresponding to each transmission layer in the second information is

It should be understood that in the second information, the transmission layer corresponding to the same spatial vector can be pre-configured in the first device and the second device. In this case, of the two transmission layers corresponding to the same spatial vector, only the spatial vector corresponding to one transmission layer needs to be indicated. That is, the overhead of indicating the spatial vectors corresponding to the two transmission layers is Wherein, _N1 is the number of antenna ports in a first direction (such as a horizontal direction), and _N2 is the number of antenna ports in a second direction (such as a vertical direction).

In a possible implementation, the channel state information further includes fourth information, where the fourth information is used to indicate a correspondence between each of the K transmission layers and a codeword.

Among them, the fourth information can indicate the correspondence between each transport layer in the K transport layers and the codeword in the form of a bit map. Assuming that the number of transport layers is 8, 8 bits can be used to indicate the transport layer. For example, the nth bit in the 8 bits corresponds to the nth transport layer. If the 1st to 4th transport layers correspond to codeword 1, the 5th to 8th transport layers correspond to a codeword 2, and the bit "0" is used to represent codeword 1 and the bit "1" is used to represent codeword 2, then the correspondence between the transport layer and the codeword can be represented by the bit map "00001111".

In this way, the codewords can be matched according to the energy of the transmission layer to avoid mapping the high-energy transmission layer and the low-energy transmission layer to the same codeword, resulting in a low channel quality indication (poor channel quality) of the first codeword, thereby improving the transmission performance.

It should be understood that the implementation of the fourth information here is only for example. In actual implementation, the fourth information can also adopt other possible implementation methods, such as directly indicating the correspondence between each transmission layer and the codeword, etc., which will not be repeated here.

In one possible implementation, the fourth information can be carried in the first part of the channel state information. In this way, the resources reserved for the second part can be reduced, thereby further reducing the overhead. Based on the channel state information reporting method provided in Figure 4, the first device can receive a reference signal and send channel state information to indicate the number of spatial vectors and the correspondence between the spatial vectors and the transmission layer. Each of the multiple spatial vectors corresponds to at least one transmission layer. In this way, it can be indicated based on the spatial vector corresponding to the transmission layer, reducing the redundancy of the information used to indicate the spatial vector, thereby achieving the purpose of improving and reducing the channel state information reporting overhead.

In addition, in the embodiment of the present application, when the number of ports is large, the matching degree between the spatial domain vector and the channel can be improved, thereby improving the accuracy of the codebook.

In some embodiments, the CSI may carry information indicating the correspondence between codewords and transport layers. The following describes the channel state information reporting method provided in conjunction with FIG5 . As shown in FIG5 , the channel state information reporting method includes:

S501: The second device sends a reference signal, and correspondingly, the first device receives the reference signal.

For the implementation of S501 , reference may be made to the relevant introduction of S401 in the method provided in FIG. 4 , and detailed description thereof will not be given here.

S502: The first apparatus sends channel state information according to a reference signal. Correspondingly, the second apparatus receives the channel state information according to the reference signal.

The channel state information includes fourth information, and the fourth information is used to indicate the correspondence between the transmission layer and the codeword.

In one possible implementation, the channel state information includes a first part, and the fourth information is carried in the first part. For the implementation of the fourth information, please refer to the relevant description of the fourth information in the method provided in FIG. 4 , and for the implementation of S502, please refer to the relevant description of S402 in the method provided in FIG. 4 , and will not be described in detail here. The difference is that the content of the channel state information in the method provided in FIG. 5 may be different from that in the method provided in FIG. 4 .

In addition, the channel state information may also include the second information and/or the first information in the method provided in FIG. 4 , which will not be described in detail.

Based on the method provided in Figure 5, codewords can be matched according to the energy of the transmission layer to avoid mapping the high-energy transmission layer and the low-energy transmission layer to the same codeword, resulting in a low channel quality indication (poor channel quality) of the first codeword, thereby improving the transmission performance.

The channel state information reporting method provided by the embodiment of the present application is described in detail above in conjunction with Figures 4 and 5. The communication device for executing the channel state information reporting method provided by the embodiment of the present application is described in detail below in conjunction with Figures 6 and 7.

For example, Figure 6 is a structural diagram of a communication device according to an embodiment of the present application. As shown in Figure 6, the communication device 600 includes a processing module 601 and a transceiver module 602. For ease of illustration, Figure 6 only shows the main components of the communication device.

In some embodiments, the communication device 600 may be applicable to the communication system shown in FIG. 2 , and perform the function of the first device in the channel state information reporting method shown in FIG. 4 .

The transceiver module 602 is configured to receive a reference signal.

Processing module 601 is configured to generate channel state information based on a reference signal. The channel state information includes first information and second information, where the first information is used to indicate the number of multiple spatial vectors, and the second information is used to indicate a correspondence between each spatial vector in the multiple spatial vectors and a transmission layer in K transmission layers, where K is a positive integer greater than or equal to 5, each spatial vector corresponds to at least one transmission layer in the K transmission layers, and at least one spatial vector in the multiple spatial vectors corresponds to two transmission layers in the K transmission layers.

The transceiver module 602 is further configured to send channel state information.

For the specific implementation of channel state information, please refer to the relevant introduction in the method provided in Figure 4, and will not be repeated here. Optionally, the transceiver module 602 may include a receiving module and a sending module (not shown in Figure 6). The transceiver module is used to implement the sending function and the receiving function of the communication device 600.

Optionally, the communication device 600 may further include a storage module (not shown in FIG6 ) storing a program or instruction. When the processing module 601 executes the program or instruction, the communication device 600 may perform the function of the first device in any of the channel state information reporting methods shown in FIG4 .

It should be understood that the processing module 601 involved in the communication device 600 can be implemented by a processor or a processor-related circuit component, which can be a processor or a processing unit; the transceiver module 602 can be implemented by a transceiver or a transceiver-related circuit component, which can be a transceiver or a transceiver unit.

It should be noted that the communication device 600 can be a terminal, a chip (system), or other components or assemblies, or a device including a terminal, and this application does not limit this. Among them, the above-mentioned chip (system) or other components or assemblies can be set in a terminal or a network device.

In addition, the technical effects of the communication device 600 can refer to the technical effects of the channel state information reporting method shown in any one of Figure 4, and will not be repeated here.

In some other embodiments, the communication device 600 may be applicable to the communication system shown in FIG. 2 , and perform the function of the second device in the channel state information reporting method shown in FIG. 4 .

The processing module 601 is configured to generate a reference signal.

The transceiver module 602 sends a reference signal.

The transceiver module 602 is configured to receive channel state information. The channel state information is determined by the first apparatus based on a reference signal, and includes first information and second information. The first information is used to indicate the number of multiple spatial vectors, and the second information is used to indicate a correspondence between each spatial vector in the multiple spatial vectors and a transmission layer in K transmission layers, where K is a positive integer greater than or equal to 5, each spatial vector corresponds to at least one transmission layer in the K transmission layers, and at least one spatial vector in the multiple spatial vectors corresponds to two transmission layers in the K transmission layers.

Optionally, the communication device 600 may further include a storage module (not shown in FIG6 ) storing a program or instruction. When the processing module 601 executes the program or instruction, the communication device 600 may perform the function of the second device in the channel state information reporting method shown in FIG4 .

It should be understood that the processing module 601 involved in the communication device 600 can be implemented by a processor or a processor-related circuit component, which can be a processor or a processing unit; the transceiver module 602 can be implemented by a transceiver or a transceiver-related circuit component, which can be a transceiver or a transceiver unit.

It should be noted that the communication device 600 can be the network device shown in Figure 2, or it can be a chip (system) or other parts or components set in the above-mentioned network device, or a device including the network device. The embodiment of the present application does not limit this.

In addition, the technical effects of the communication device 600 can refer to the technical effects of the channel state information reporting method shown in any one of Figure 4, and will not be repeated here.

In some embodiments, the communication device 600 may be applicable to the communication system shown in FIG. 2 , and perform the function of the first device in the channel state information reporting method shown in FIG. 4 .

The transceiver module 602 is configured to receive a reference signal.

The processing module 601 is configured to generate channel state information according to the reference signal. The channel state information includes fourth information, and the fourth information is configured to indicate a correspondence between each of the K transmission layers and a codeword.

The transceiver module 602 is further configured to send channel state information.

For the specific implementation of channel state information, please refer to the relevant introduction in the method provided in Figure 5, and will not be repeated here. Optionally, the transceiver module 602 may include a receiving module and a sending module (not shown in Figure 6). The transceiver module is used to implement the sending function and the receiving function of the communication device 600.

Optionally, the communication device 600 may further include a storage module (not shown in FIG6 ) storing a program or instruction. When the processing module 601 executes the program or instruction, the communication device 600 may perform the function of the first device in any of the channel state information reporting methods shown in FIG5 .

It should be understood that the processing module 601 involved in the communication device 600 can be implemented by a processor or a processor-related circuit component, which can be a processor or a processing unit; the transceiver module 602 can be implemented by a transceiver or a transceiver-related circuit component, which can be a transceiver or a transceiver unit.

It should be noted that the communication device 600 can be a terminal, a chip (system), or other components or assemblies, or a device including a terminal, and this application does not limit this. Among them, the above-mentioned chip (system) or other components or assemblies can be set in a terminal or a network device.

In addition, the technical effects of the communication device 600 can refer to the technical effects of the channel state information reporting method shown in any one of Figure 5, and will not be repeated here.

In some other embodiments, the communication device 600 may be applicable to the communication system shown in FIG. 2 , and perform the function of the second device in the channel state information reporting method shown in FIG. 5 .

The processing module 601 is configured to generate a reference signal.

The transceiver module 602 sends a reference signal.

The transceiver module 602 is configured to receive channel state information. The channel state information includes fourth information, and the fourth information is used to indicate a correspondence between each of the K transmission layers and a codeword.

Optionally, the communication device 600 may further include a storage module (not shown in FIG6 ) storing a program or instruction. When the processing module 601 executes the program or instruction, the communication device 600 may perform the function of the second device in the channel state information reporting method shown in FIG5 .

It should be understood that the processing module 601 involved in the communication device 600 can be implemented by a processor or a processor-related circuit component, which can be a processor or a processing unit; the transceiver module 602 can be implemented by a transceiver or a transceiver-related circuit component, which can be a transceiver or a transceiver unit.

It should be noted that the communication device 600 can be the network device shown in Figure 2, or it can be a chip (system) or other parts or components set in the above-mentioned network device, or a device including the network device. The embodiment of the present application does not limit this.

In addition, the technical effects of the communication device 600 can refer to the technical effects of the channel state information reporting method shown in any one of Figure 5, and will not be repeated here.

Illustratively, FIG7 is a second structural diagram of a communication device provided in an embodiment of the present application. The communication device may be a terminal device or a network device, or may be a chip (system) or other parts or components. As shown in FIG7 , a communication device 700 may include a processor 701. Optionally, the communication device 700 may further include a memory 702 and/or a transceiver 703. The processor 701 is coupled to the memory 702 and the transceiver 703, such as by a communication bus. The above-mentioned chip (system) or other parts or components may be arranged in a terminal or a network device.

The following is a detailed introduction to the various components of the communication device 700 with reference to FIG7 :

The processor 701 is the control center of the communication device 700 and can be a single processor or a collective term for multiple processing elements. For example, the processor 701 can be one or more central processing units (CPUs), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, such as one or more digital signal processors (DSPs) or one or more field programmable gate arrays (FPGAs).

Optionally, the processor 701 may execute various functions of the communication device 700 by running or executing a software program stored in the memory 702 and calling data stored in the memory 702 .

In a specific implementation, as an embodiment, the processor 701 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 7 .

In a specific implementation, as an embodiment, the communication device 700 may also include multiple processors, such as the processor 701 and the processor 704 shown in FIG7 . Each of these processors may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

Among them, the memory 702 is used to store the software program for executing the solution of this application, and the execution is controlled by the processor 701. The specific implementation method can refer to the above method embodiment and will not be repeated here.

Alternatively, the memory 702 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, a random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, an optical disc storage (including a compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto. The memory 702 may be integrated with the processor 701 or exist independently and be coupled to the processor 701 via an interface circuit (not shown in FIG. 7 ) of the communication device 700. This embodiment of the present application does not specifically limit this.

Transceiver 703 is used for communication with other communication devices. For example, if communication device 700 is a terminal device, transceiver 703 can be used to communicate with a network device or another terminal device. For another example, if communication device 700 is a network device, transceiver 703 can be used to communicate with a terminal device or another network device.

Optionally, the transceiver 703 may include a receiver and a transmitter (not shown separately in FIG7 ), wherein the receiver is used to implement a receiving function, and the transmitter is used to implement a sending function.

Optionally, the transceiver 703 may be integrated with the processor 701 or exist independently and be coupled to the processor 701 through an interface circuit (not shown in FIG. 7 ) of the communication device 700 . This embodiment of the present application does not specifically limit this.

It should be noted that the structure of the communication device 700 shown in FIG7 does not constitute a limitation on the communication device. An actual communication device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

In addition, the technical effects of the communication device 700 can refer to the technical effects of the channel state information reporting method described in the above method embodiment, and will not be repeated here.

It should be understood that the processor in the embodiments of the present application may be a CPU, but may also be other general-purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

It should also be understood that the memory in the embodiments of the present application can be volatile memory or non-volatile memory, or can include both volatile and non-volatile memory. Among them, the non-volatile memory can be ROM, programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), EEPROM or flash memory. The volatile memory can be RAM, which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM) and direct RAM bus random access memory (DR RAM).

The above embodiments can be implemented in whole or in part by software, hardware (such as circuits), firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (such as infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

It should be understood that the term "and/or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and/or B" can represent: A alone, A and B together, or B alone. A and B can be singular or plural. Furthermore, the character "/" as used herein generally indicates an "or" relationship between the associated objects, but it may also indicate an "and/or" relationship. For specific understanding, please refer to the context.

In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or plural.

It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims (37)

A channel state information reporting method, characterized in that the method includes: receiving a reference signal; Channel state information is sent according to the reference signal, and the channel state information includes first information and second information, the first information is used to indicate the number of multiple spatial domain vectors, and the second information is used to indicate the correspondence between each spatial domain vector in the multiple spatial domain vectors and a transmission layer in K transmission layers, where K is a positive integer greater than or equal to 5, each of the spatial domain vectors corresponds to at least one transmission layer in the K transmission layers, and at least one spatial domain vector in the multiple spatial domain vectors corresponds to two transmission layers in the K transmission layers. The method according to claim 1 is characterized in that the first information is carried in the first part of the channel state information. The method according to claim 1 or 2 is characterized in that the second information is carried in the second part of the channel state information. The method according to any one of claims 1 to 3, characterized in that the number of spatial vectors in the multiple spatial vectors is related to K. The method according to claim 4, wherein the number of the plurality of spatial vectors satisfies the following relationship:
Wherein, L is the number of the plurality of spatial domain vectors, and L is an integer greater than 2. The method according to any one of claims 1 to 5, characterized in that K is an even number, and Each of the multiple spatial domain vectors corresponds to two transmission layers among the K transmission layers, and each of the spatial domain vectors corresponds to different transmission layers. The method according to any one of claims 1-4 is characterized in that K=6, and the K transmission layers correspond to 4 spatial domain vectors, wherein the first spatial domain vector corresponds to the first transmission layer and the second transmission layer, the second spatial domain vector corresponds to the third transmission layer and the fourth transmission layer, the third spatial domain vector corresponds to the fifth transmission layer, and the fourth spatial domain vector corresponds to the sixth transmission layer. The method according to any one of claims 1-5 is characterized in that K is an odd number, there is a first spatial domain vector among the multiple spatial domain vectors corresponding to one transmission layer; and each spatial domain vector among the multiple spatial domain vectors except the first spatial domain vector corresponds to two transmission layers. The method according to any one of claims 1-4 is characterized in that K=5, and the K transmission layers correspond to 4 spatial domain vectors, wherein the first spatial domain vector corresponds to the first transmission layer and the second transmission layer, the second spatial domain vector corresponds to the third transmission layer, the third spatial domain vector corresponds to the fourth transmission layer, and the fourth spatial domain vector corresponds to the fifth transmission layer. The method according to any one of claims 1-9 is characterized in that the channel state information also includes third information; the third information is used to indicate the inter-polarization phase difference of at least one transmission layer in the transmission layer corresponding to each spatial vector in the multiple spatial vectors. The method according to claim 10, characterized in that the third information is carried in the second part of the channel state information. The method according to any one of claims 1-11 is characterized in that the channel state information further includes fourth information, and the fourth information is used to indicate the correspondence between the transmission layer and the codeword. The method according to claim 12, characterized in that the fourth information is carried in the first part of the channel state information. A channel state information reporting method, characterized in that the method includes: Sending a reference signal; Receive channel state information; the channel state information is determined by a first device based on the reference signal, the channel state information including first information and second information, the first information is used to indicate the number of multiple spatial domain vectors, and the second information is used to indicate the correspondence between each spatial domain vector in the multiple spatial domain vectors and a transmission layer in K transmission layers, wherein K is a positive integer greater than or equal to 5, each of the spatial domain vectors corresponds to at least one transmission layer in the K transmission layers, and at least one spatial domain vector in the multiple spatial domain vectors corresponds to two transmission layers in the K transmission layers. The method according to claim 14, characterized in that the first information is carried in the first part of the channel state information. The method according to claim 14 or 15 is characterized in that the second information is carried in the second part of the channel state information. The method according to any one of claims 14 to 16, wherein the number of spatial vectors in the plurality of spatial vectors is related to K. The method according to claim 17, wherein the number of the plurality of spatial vectors satisfies the following relationship:
Wherein, L is the number of the plurality of spatial domain vectors, and L is an integer greater than 2. The method according to any one of claims 14 to 18, wherein K is an even number, and Each of the multiple spatial domain vectors corresponds to two transmission layers among the K transmission layers, and each of the spatial domain vectors corresponds to different transmission layers. The method according to any one of claims 14-17 is characterized in that K=6, and the K transmission layers correspond to 4 spatial domain vectors, wherein the first spatial domain vector corresponds to the first transmission layer and the second transmission layer, the second spatial domain vector corresponds to the third transmission layer and the fourth transmission layer, the third spatial domain vector corresponds to the fifth transmission layer, and the fourth spatial domain vector corresponds to the sixth transmission layer. The method according to any one of claims 14-18 is characterized in that K is an odd number, there is a first spatial vector among the multiple spatial vectors corresponding to one transmission layer; and each spatial vector among the multiple spatial vectors except the first spatial vector corresponds to two transmission layers. The method according to any one of claims 14-17 is characterized in that K=5, and the K transmission layers correspond to 4 spatial domain vectors, wherein the first spatial domain vector corresponds to the first transmission layer and the second transmission layer, the second spatial domain vector corresponds to the third transmission layer, the third spatial domain vector corresponds to the fourth transmission layer, and the fourth spatial domain vector corresponds to the fifth transmission layer. The method according to any one of claims 14-22 is characterized in that the channel state information also includes third information; the third information is used to indicate the inter-polarization phase difference of at least one transmission layer in the transmission layer corresponding to each spatial vector in the multiple spatial vectors. The method according to claim 23 is characterized in that the third information is carried in the second part of the channel state information. The method according to any one of claims 14-24 is characterized in that the channel state information also includes fourth information, and the fourth information is used to indicate the correspondence between the transmission layer and the codeword. The method according to claim 25 is characterized in that the fourth information is carried in the first part of the channel state information. A channel state information reporting method, characterized in that the method includes: receiving a reference signal; Channel state information is sent according to the reference signal; the channel state information includes fourth information, and the fourth information is used to indicate the correspondence between the transmission layer and the codeword. The method according to claim 27 is characterized in that the channel state information includes a first part, and the fourth information is carried in the first part. A channel state information reporting method, characterized in that the method includes: Sending a reference signal; Receive channel state information; the channel state information is determined by the first device according to the reference signal, the channel state information includes fourth information, and the fourth information is used to indicate the correspondence between the transmission layer and the codeword. The method according to claim 29 is characterized in that the channel state information includes a first part, and the fourth information is carried in the first part. A communication device, characterized in that the communication device is used to execute the method according to any one of claims 1 to 30. A communication device, characterized in that it comprises: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device executes the method according to any one of claims 1 to 30. A communication device, comprising: a processor and an interface circuit; wherein: The interface circuit is used to receive code instructions and transmit them to the processor; The processor is configured to execute the code instructions to perform the method according to any one of claims 1 to 30. A communication device, characterized in that the communication device includes a processor and a transceiver, the transceiver is used to exchange information between the communication device and other communication devices, and the processor executes program instructions to perform the method as described in any one of claims 1-30. The communication device according to claim 33 or 34 is characterized in that the communication device is a chip. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a computer program or instructions, and when the computer program or instructions are executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 30. A computer program product, characterized in that the computer program product comprises: a computer program or instructions, which, when executed on a computer, causes the computer to execute the method according to any one of claims 1 to 30.