Communication method and related apparatus

Abstract

Provided in the present application are a communication method and a related apparatus, which can be used in the technical field of communications. In the technical solution provided in the present application, a first network element can send first information and second information to a second network element, wherein the first information indicates a multipath angle of a first channel map and / or a multipath delay of the first channel map, and the second information is used for indicating a projection coefficient of a channel map basis of each channel sub-map in the first channel map; and correspondingly, after receiving the first information and the second information, the second network element can reconstruct the first channel map. The method facilitates the reduction of transmission overheads between a first network element and a second network element.

Description

Communication method and related device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 12, 2024, with application number 202410052435.4 and application name “Communication Methods and Related Devices”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a communication method and related devices. Background Art

[0003] In a wireless communication system, communication devices can perform channel detection based on a channel map. The channel map is used to store channel characteristics of location information, which include a channel statistical covariance matrix, an angle spectrum, a delay spectrum, etc. Among them, the channel statistical covariance matrix can be used to indicate the map basis of the channel map, the angle spectrum is used to indicate the multipath angle of the channel map, and the delay spectrum is used to indicate the multipath delay of the channel map.

[0004] Before communication devices perform channel detection based on a channel spectrum, it is necessary to transmit the channel spectrum. For example, the first network element can first obtain the channel spectrum to be transmitted and divide the channel spectrum into multiple sub-channel spectra, and then project the channel spectrum basis corresponding to each sub-channel spectrum in the multiple sub-channel spectra onto the discrete Fourier transform (DFT) basis to obtain the projection coefficient corresponding to each sub-channel spectrum, and finally send information to the second network element. The information is used to indicate at least one non-zero value in the projection coefficient corresponding to each sub-channel spectrum and the index of the at least one non-zero value. Accordingly, after receiving the information, the second network element can reconstruct the channel spectrum basis based on the information, and then perform channel detection based on the reconstructed channel spectrum basis.

[0005] However, when the first network element and the second network element transmit the channel map using this method, the transmission overhead between the first network element and the second network element is large. Summary of the Invention

[0006] The present application provides a communication method and related devices for solving the problem of high transmission overhead between a first network element and a second network element in the prior art.

[0007] In a first aspect, the present application provides a communication method, which is applied to a first network element. The method includes: obtaining a first channel spectrum, the first channel spectrum including a first sub-channel spectrum and a second sub-channel spectrum, the multipath angle of the first sub-channel spectrum and the multipath angle of the second sub-channel spectrum are equal to the first multipath angle, the first multipath angle is the multipath angle of the first channel spectrum, the multipath delay of the first sub-channel spectrum and the multipath delay of the second sub-channel spectrum are equal to the first multipath delay, and the first multipath delay is the multipath delay of the first channel spectrum; sending first information, the first information indicating the first multipath angle and / or the first multipath delay; sending second information, the second information indicating a first projection coefficient and a second projection coefficient, the first projection coefficient being the projection coefficient of the channel spectrum basis of the first sub-channel spectrum, and the second projection coefficient being the projection coefficient of the channel spectrum basis of the second sub-channel spectrum.

[0008] As an example, the first network element may be a core network device as shown in Figure 4. In this example, the first network element may construct a first channel map based on an LMF network element / MMF network element in the first network element.

[0009] As another example, the first network element may be a radio access network device as shown in Figure 4. In this example, the first network element may obtain the first channel map from a core network device.

[0010] In this method, the first channel spectrum may be a channel spectrum to be transmitted. The first network element may divide the first channel spectrum into multiple spatial grids to obtain channel spectra corresponding to the multiple spatial grids. The channel spectrum corresponding to each of the multiple spatial grids may be referred to as a sub-channel spectrum. In other words, the first channel spectrum may include multiple sub-channel spectra. Optionally, the first sub-channel spectrum and the second sub-channel spectrum may be any two sub-channel spectra from the multiple sub-channel spectra.

[0011] The multipath angle of the first subchannel spectrum and the multipath angle of the second subchannel spectrum are equal to the first multipath angle, which can be understood as: the multipath angle of the first subchannel spectrum and the multipath angle of the second subchannel spectrum are the same, the multipath angle of the first subchannel spectrum is equal to the first multipath angle, and the multipath angle of the second subchannel spectrum is equal to the first multipath angle.

[0012] The multipath delay of the first subchannel spectrum and the multipath delay of the second subchannel spectrum are equal to the first multipath delay, which can be understood as: the multipath delay of the first subchannel spectrum is the same as the multipath delay of the second subchannel spectrum, the multipath delay of the first subchannel spectrum is equal to the first multipath delay, and the multipath delay of the second subchannel spectrum is equal to the first multipath delay.

[0013] In this method, the first channel spectrum may be a spatial domain channel spectrum, a frequency domain channel spectrum, a space-frequency channel spectrum, or the like.

[0014] In this method, after receiving the first and second information, the second network element can reconstruct each sub-channel spectrum based on the multipath angle and / or multipath delay of any sub-channel spectrum and the projection coefficient of the channel spectrum basis of each sub-channel spectrum, thereby reconstructing the first channel spectrum. In this method, the first network element only needs to send the first multipath angle and / or first multipath delay to the second network element, without having to send the multipath angle and / or multipath delay of each sub-channel spectrum, which helps reduce transmission overhead between the first network element and the second network element.

[0015] In addition, the projection coefficient sent by the first network element to the second network element can be a vector instead of a matrix, which can also reduce the transmission overhead between the first network element and the second network element.

[0016] In some possible implementations, the second information indicates the first projection coefficient, including: the second information includes a non-zero value in the first projection coefficient and an index of the non-zero value in the first projection coefficient.

[0017] In this method, the index of the non-zero value in the first projection coefficient can be used to indicate the position of the non-zero value in the first projection coefficient in the first projection coefficient.

[0018] The first network element can first calculate the projection coefficient of the channel spectrum basis of the first sub-channel spectrum, and the first projection coefficient can include at least one non-zero value, and then send each non-zero value in the at least one non-zero value and the index of each non-zero value to the second network element, so that the second network element can determine the position of each non-zero value in the first projection coefficient based on the index of each non-zero value in the at least one non-zero value, and then determine the first projection coefficient.

[0019] In this method, the first network element can send non-zero values ​​of the first projection coefficients instead of all values ​​to the second network element, which is conducive to reducing transmission overhead.

[0020] In some possible implementations, the second information indicates a second projection coefficient, including: the second information further includes a non-zero value in the second projection coefficient and an index of the non-zero value in the second projection coefficient.

[0021] In this method, the index of the non-zero value in the second projection coefficient can be used to indicate the position of the non-zero value in the second projection coefficient in the second projection coefficient.

[0022] The first network element can first calculate the projection coefficient of the channel spectrum basis of the second sub-channel spectrum, which can include at least one non-zero value, and then send each non-zero value in the at least one non-zero value and the index of each non-zero value to the second network element, so that the second network element can determine the position of each non-zero value in the second projection coefficient based on the index of each non-zero value in the at least one non-zero value, and then determine the second projection coefficient.

[0023] In this method, the first network element can send non-zero values ​​of the second projection coefficients instead of all values ​​to the second network element, which is conducive to reducing transmission overhead.

[0024] In some possible implementations, the second information indicates a second projection coefficient, including: the second information further includes a non-zero value in a difference between the second projection coefficient and the first projection coefficient and an index of the non-zero value in the difference.

[0025] In this method, there may be a common subspace between the second subchannel spectrum and the first subchannel spectrum, so that the difference between the first projection coefficient and the second projection coefficient may be zero, or some elements in the difference may be zero, and the number of non-zero values ​​of the difference may be smaller than the non-zero values ​​in the second projection coefficient. This can reduce the number of non-zero values ​​sent by the first network element, which is conducive to reducing transmission overhead.

[0026] In some possible implementations, the channel spectrum basis of the first subchannel spectrum includes a common channel spectrum basis and / or a first non-common channel spectrum basis, the first projection coefficient includes a first subspace projection coefficient and / or a second subspace projection coefficient, the first subspace projection coefficient is the projection coefficient of the common channel spectrum basis, and the second subspace projection coefficient is the projection coefficient of the first non-common channel spectrum basis.

[0027] The common channel spectrum basis is a common subspace of the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum, and the direct sum of the common channel spectrum basis and the first non-common channel spectrum basis is equal to the channel spectrum basis of the first sub-channel spectrum.

[0028] In some possible implementations, the second information indicates the first projection coefficient, including: the second information includes the non-zero value in the first subspace projection coefficient, the index of the non-zero value in the first subspace projection coefficient, the non-zero value in the second subspace projection coefficient, and the index of the non-zero value in the second subspace projection coefficient.

[0029] In this method, the first network element can first calculate the first subspace projection coefficient and the second subspace projection coefficient, and then send the second information to the second network element. After receiving the second information, the second network element can determine the first subspace projection coefficient based on the non-zero value in the first subspace projection coefficient and the index of the non-zero value in the first subspace projection coefficient, and determine the second subspace projection coefficient based on the non-zero value in the second subspace projection coefficient and the index of the non-zero value in the second subspace projection coefficient, and then restore the common channel spectrum basis and the first non-public channel spectrum basis according to the first subspace projection coefficient and the second subspace projection coefficient, and perform a direct sum of the common channel spectrum basis and the first non-public channel spectrum basis to obtain the channel spectrum basis of the first subchannel spectrum.

[0030] In some possible implementations, the channel spectrum basis of the second sub-channel spectrum includes the common channel spectrum basis and / or the second non-common channel spectrum basis, the second projection coefficient includes the first subspace projection coefficient and / or the third subspace projection coefficient, the third subspace projection coefficient is the projection coefficient of the second non-common channel spectrum basis, and the direct sum of the common channel spectrum basis and the second non-common channel spectrum basis is equal to the channel spectrum basis of the second sub-channel spectrum.

[0031] The second information indicates the second projection coefficient, including: the second information further includes a non-zero value in the third subspace projection coefficient and an index of the non-zero value in the third subspace projection coefficient.

[0032] In this method, the first network element can first calculate the third subspace projection coefficient, and then send the second information to the second network element. After receiving the second information, the second network element can determine the third subspace projection coefficient based on the non-zero value in the third subspace projection coefficient and the index of the non-zero value in the third subspace projection coefficient, and then restore the common channel spectrum basis and the second non-public channel spectrum basis according to the first subspace projection coefficient and the third subspace projection coefficient, and directly sum the common channel spectrum basis and the second non-public channel spectrum basis to obtain the channel spectrum basis of the second subchannel spectrum.

[0033] In this method, the first subspace projection coefficient is the projection coefficient corresponding to the common subspace of the channel spectrum basis of the first subchannel spectrum and the channel spectrum basis of the second subchannel spectrum. The first network element can send the first subspace projection coefficient to the second network element only once, which is conducive to saving transmission overhead.

[0034] In some possible implementations, the first sub-channel spectrum is adjacent to the second sub-channel spectrum.

[0035] In this method, the second sub-channel spectrum is adjacent to the first sub-channel spectrum, so there are more elements in the common subspace between the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum, and fewer elements in the non-common subspace, which is conducive to further reducing transmission overhead.

[0036] In a second aspect, the present application provides a communication method, which is applied to a second network element. The method may include: receiving first information, the first information indicating a first multipath angle and / or a first multipath delay, the first multipath angle being the multipath angle of the first channel spectrum, the first multipath angle being equal to the multipath angle of the first sub-channel spectrum in the first channel spectrum and the multipath angle of the second sub-channel spectrum in the first channel spectrum, the first multipath delay being the multipath delay of the first channel spectrum, and the first multipath delay being equal to the multipath delay of the first sub-channel spectrum and the multipath delay of the second sub-channel spectrum; receiving second information, the second information indicating a first projection coefficient and a second projection coefficient, the first projection coefficient being the projection coefficient of the channel spectrum basis of the first sub-channel spectrum, and the second projection coefficient being the projection coefficient of the channel spectrum basis of the second sub-channel spectrum; reconstructing an array vector and / or a subcarrier vector based on the first information, and reconstructing the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum based on the second information.

[0037] In some possible implementations, the second information indicates the first projection coefficient, including: the second information includes a non-zero value in the first projection coefficient and an index of the non-zero value in the first projection coefficient.

[0038] In some possible implementations, the second information indicates a second projection coefficient, including: the second information further includes a non-zero value in the second projection coefficient and an index of the non-zero value in the second projection coefficient.

[0039] In some possible implementations, the second information indicates a second projection coefficient, including: the second information further includes a non-zero value in a difference between the second projection coefficient and the first projection coefficient and an index of the non-zero value in the difference.

[0040] The method further includes: determining the second projection coefficient based on the first projection coefficient, the non-zero value in the difference, and the index of the non-zero value in the difference; and reconstructing the channel spectrum basis of the second sub-channel spectrum based on the second projection coefficient.

[0041] In some possible implementations, the channel spectrum basis of the first subchannel spectrum includes a common channel spectrum basis and / or a first non-common channel spectrum basis, the first projection coefficient includes a first subspace projection coefficient and / or a second subspace projection coefficient, the first subspace projection coefficient is the projection coefficient of the common channel spectrum basis, and the second subspace projection coefficient is the projection coefficient of the first non-common channel spectrum basis.

[0042] The common channel spectrum basis is a common subspace of the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum, and the direct sum of the common channel spectrum basis and the first non-common channel spectrum basis is equal to the channel spectrum basis of the first sub-channel spectrum.

[0043] In some possible implementations, the second information indicates the first projection coefficient, including: the second information includes the non-zero value in the first subspace projection coefficient, the index of the non-zero value in the first subspace projection coefficient, the non-zero value in the second subspace projection coefficient, and the index of the non-zero value in the second subspace projection coefficient.

[0044] The channel spectrum basis of reconstructing the first subchannel spectrum based on the second information includes: determining the first subspace projection coefficient based on the non-zero value in the first subspace projection coefficient and the index of the non-zero value in the first subspace projection coefficient; reconstructing the common channel spectrum basis based on the first subspace projection coefficient; determining the second subspace projection coefficient based on the non-zero value in the second subspace projection coefficient and the index of the non-zero value in the second subspace projection coefficient; reconstructing the first non-common channel spectrum basis based on the second subspace projection coefficient; and determining the channel spectrum basis of the first subchannel spectrum based on the common channel spectrum basis and the first non-common channel spectrum basis.

[0045] In some possible implementations, the channel spectrum basis of the second sub-channel spectrum includes the common channel spectrum basis and / or the second non-common channel spectrum basis, the second projection coefficient includes the first subspace projection coefficient and / or the third subspace projection coefficient, the third subspace projection coefficient is the projection coefficient of the second non-common channel spectrum basis, and the direct sum of the common channel spectrum basis and the second non-common channel spectrum basis is equal to the channel spectrum basis of the second sub-channel spectrum.

[0046] The second information indicates the second projection coefficient, including: the second information further includes a non-zero value in the third subspace projection coefficient and an index of the non-zero value in the third subspace projection coefficient.

[0047] The channel spectrum basis of reconstructing the second sub-channel spectrum based on the second information includes: determining the third subspace projection coefficient based on the non-zero value in the third subspace projection coefficient and the index of the non-zero value in the third subspace projection coefficient; reconstructing the second non-public channel spectrum basis based on the third subspace projection coefficient; and determining the channel spectrum basis of the second sub-channel spectrum based on the public channel spectrum basis and the second non-public channel spectrum basis.

[0048] In some possible implementations, the first sub-channel spectrum is adjacent to the second sub-channel spectrum.

[0049] In a third aspect, the present application provides a communication device, comprising modules or units for implementing the method in the first aspect and any possible implementation of the first aspect. It should be understood that each module or unit can implement the corresponding function by executing a computer program.

[0050] In a fourth aspect, the present application provides a communication device, comprising modules or units for implementing the method in the second aspect and any possible implementation of the second aspect. It should be understood that each module or unit can implement the corresponding function by executing a computer program.

[0051] In a fifth aspect, the present application provides a communication device, comprising a processor, wherein the processor is configured to execute the method described in any possible implementation of the first aspect or the second aspect.

[0052] The apparatus may further include a memory for storing instructions and data. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the methods described in the above aspects may be implemented. The apparatus may further include a communication interface for communicating between the apparatus and other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface.

[0053] In a sixth aspect, the present application provides a computer-readable storage medium storing a program code for execution by a device, wherein the program code includes instructions for implementing the method described in any possible implementation of the first aspect or the second aspect.

[0054] In a seventh aspect, the present application provides a computer program product comprising instructions, which, when executed on a device, enables the device to implement the method described in any possible implementation of the first aspect or the second aspect.

[0055] It can be understood that the effects that can be obtained from the second to seventh aspects can be referred to the description in the first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] FIG1 is a schematic diagram of a communication system applicable to an embodiment of the present application;

[0057] FIG2 is an example diagram of a channel spectrum;

[0058] FIG3 is a schematic diagram of a method for constructing a channel map;

[0059] FIG4 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0060] FIG5 is a flow chart of a communication method provided in an embodiment of the present application;

[0061] FIG6 is a schematic diagram of a base station array;

[0062] FIG7 is a schematic diagram of a layered transmission provided in an embodiment of the present application;

[0063] FIG8 is a flow chart of a communication method provided by one embodiment of the present application;

[0064] FIG9 is a schematic diagram of a first channel spectrum provided by this application;

[0065] FIG10 is a schematic diagram of a method for a first network element to calculate a projection coefficient of a channel spectrum basis of each sub-channel spectrum in a first channel spectrum according to an embodiment of the present application;

[0066] FIG11 is a schematic diagram of a method for a second network element to reconstruct a first channel map according to an embodiment of the present application;

[0067] FIG12 is a flow chart of a communication method provided by another embodiment of the present application;

[0068] FIG13 is a schematic diagram of a method provided by an embodiment of the present application for a first network element to calculate the difference between the projection coefficient of the channel spectrum basis of each sub-channel spectrum in other sub-channel spectrums in the first channel spectrum and the projection coefficient of the channel spectrum basis of the target sub-channel spectrum;

[0069] FIG14 is a schematic diagram of a method for a second network element to reconstruct a first channel map according to another embodiment of the present application;

[0070] FIG15 is a flow chart of a communication method provided by another embodiment of the present application;

[0071] FIG16 is a schematic diagram of a method provided by an embodiment of the present application for a first network element to calculate projection coefficients of a common subspace and projection coefficients of a non-common subspace between a channel spectrum basis of a target subchannel spectrum and channel spectrum basis of other subchannel spectrums in a first channel spectrum;

[0072] FIG17 is a schematic diagram of a method for a second network element to reconstruct a first channel map according to another embodiment of the present application;

[0073] FIG18 is a schematic diagram of a communication device provided by an embodiment of the present application;

[0074] FIG19 is a schematic diagram of a communication device provided in another embodiment of the present application;

[0075] FIG20 is a schematic diagram of a communication device provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0076] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0077] To facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. For example, the first information and the second information are merely used to distinguish different information and do not limit their order. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity or execution order, and words such as "first" and "second" do not necessarily limit differences.

[0078] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" 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 represent: a, b, c; a and b; a and c; b and c; or a, b, and c. Among them, a, b, and c can be single or multiple.

[0079] The communication method of the embodiment of the present application can be applicable to a communication system in which there are at least two entities, one of which needs to send transmission direction indication information, and the other entity needs to receive the indication information and determine the transmission direction within a certain period of time based on the indication information. As an example, the communication system may include a long term evolution (LTE) system, a fifth generation (5G) communication system or a new radio (NR), a non-terrestrial network (NTN), and a future communication system such as a sixth generation (6G) communication system, etc., and the present invention is not limited to this.

[0080] Below, the embodiments of the present application are described in detail with reference to the accompanying drawings.

[0081] To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described with reference to Figure 1. As shown in Figure 1, the communication system includes a network device and a terminal device.

[0082] The technical solutions provided in the embodiments of this application can be applied to wireless communications between communication devices. Wireless communications between communication devices may include: wireless communications between network devices and terminal devices, wireless communications between network devices, and wireless communications between terminal devices. In the embodiments of this application, the term "wireless communications" may also be referred to as "communication," and the term "communication" may also be described as "data transmission," "information transmission," or "transmission." In the embodiments of this application, a communication device may also be referred to as a network element.

[0083] In the embodiment of the present application, a network device is an entity used to transmit or receive signals. The network device may include a radio access network (RAN) device and a core network device.

[0084] Terminal devices can be connected to wireless access network devices wirelessly, and wireless access network devices can be connected to core network devices wirelessly or by wired communication. Core network devices and wireless access network devices can be independent, distinct physical devices, or they can integrate the core network device's functions and the wireless access network device's logical functions into the same physical device. Alternatively, a single physical device can integrate some core network device functions and some wireless access network device functions. Terminal devices and wireless access network devices can be connected to each other by wired or wireless communication. Optionally, the communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in Figure 1.

[0085] The terminal device may also be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. It may be an entity on the user side for receiving or transmitting signals, such as a mobile phone. The terminal device includes a handheld device, a vehicle-mounted device, a wearable device, or a computing device with wireless communication capabilities. Exemplarily, the UE may be a mobile phone, a tablet computer, or a computer with wireless transceiver capabilities. The terminal device may also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a wireless terminal in a smart home, and the like. The terminal can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, drone, helicopter, airplane, ship, robot, robotic arm, smart home device, etc. In the embodiment of the present application, the device for implementing the function of the terminal can be a terminal; it can also be a device that can support the terminal to implement the function, such as a chip system, or a communication module, or a modem, which can be installed in the terminal. In the embodiment of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices. In the technical solutions provided in the embodiments of the present application, the device for implementing the function of the terminal is a terminal, and the terminal is a UE as an example to describe the technical solutions provided in the embodiments of the present application. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.

[0086] Radio access network equipment can be equipment that provides wireless communication function services, usually located on the network side, including but not limited to: the next generation base station (gNodeB, gNB) in 5G communication systems, the next generation base station in the sixth generation (6G) mobile communication system, the base station in the future mobile communication system or the access node in the WiFi system, etc., the evolved node B (eNB) in the long term evolution (LTE) system, the radio network controller (RNC), the node B (NB), the base station controller (BSC), the home base station (e.g., home evolved NodeB, or home Node B, HNB), the base band unit (BBU), the transmission reception point (TRP), the transmitting point (TP), the base transceiver station (BTS), etc. In a network structure, the access network equipment may include at least one of a centralized unit (CU), a distributed unit (DU), and a radio unit (RU). Access network equipment provides services for a cell. User equipment communicates with a base station through the transmission resources used by the cell (e.g., frequency domain resources, or spectrum resources). The cell can be a cell corresponding to a base station (e.g., a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. Small cells here can include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have small coverage and low transmission power and are suitable for providing high-speed data transmission services. Radio access network equipment can be a satellite, a macro base station, a micro base station or an indoor station, or a relay node or donor node. It provides wireless communication services to user equipment, wireless controllers in cloud radio access network (CRAN) scenarios, relay stations, vehicle-mounted devices, wearable devices, and network equipment in future evolution networks.The access network device in this embodiment may also be an open radio access network (O-RAN) device, which may include at least one of an open distributed unit (O-DU), an open centralized unit (O-CU), and an open radio unit (O-RU).

[0087] The embodiments of the present application do not limit the specific technology and specific device form used by the wireless access network device. For ease of description, the following description uses a base station as an example of a wireless access network device.

[0088] In this application, the number of wireless access network devices and terminal devices may not be limited. For example, the number of wireless access network devices may be at least one, and each of the at least one wireless access network devices may be connected to at least one terminal device.

[0089] In this application, wireless access network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water; and can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of wireless access network equipment and terminal equipment.

[0090] As shown in Figure 1, terminal devices may include terminal device 1, terminal device 2, ..., and terminal device 6, and wireless access network equipment may include a base station. In this communication system, data can be transmitted between the base station and core network equipment. In addition, any terminal device from terminal device 1 to terminal device 6 can send uplink data to the base station, and the base station needs to receive the uplink data sent by any terminal device.

[0091] Optionally, terminal devices 4, 5, and 6 may also form a communication system. In this communication system, the base station may send downlink information to terminal devices 1, 2, 3, and 5, and terminal device 5 may also send downlink information to terminal devices 4 and 6.

[0092] The embodiments of the present application can be applied to downlink signal transmission, uplink signal transmission, and device-to-device (D2D) signal transmission. For downlink signal transmission, the transmitting device is a wireless access network device, and the corresponding receiving device is a terminal device. For uplink signal transmission, the transmitting device is a terminal device, and the corresponding receiving device is a wireless access network device. For D2D signal transmission, the transmitting device is a terminal device, and the corresponding receiving device is also a terminal device. The embodiments of the present application do not limit the direction of signal transmission.

[0093] The wireless access network device and the terminal device, as well as the terminal device and the terminal device, can communicate through the authorized spectrum, or can communicate through the unlicensed spectrum, or can communicate through both the authorized spectrum and the unlicensed spectrum at the same time. The wireless access network device and the terminal device, as well as the terminal device and the terminal device, can communicate through the spectrum below 6G, or can communicate through the spectrum above 6G, or can communicate through the spectrum below 6G and the spectrum above 6G at the same time. The embodiments of the present application do not limit the spectrum resources used between the wireless access network device and the terminal device.

[0094] In this communication system, communication devices can perform channel detection based on a channel map. A channel map can be defined as a database that stores channel characteristics related to location information, including the channel statistical covariance matrix, angle spectrum, and delay spectrum. The channel statistical covariance matrix indicates the spectral basis of the channel map, the angle spectrum indicates the multipath angle of the channel map, and the delay spectrum indicates the multipath delay of the channel map.

[0095] Currently, the physical cell can be divided into two-dimensional or three-dimensional grid points, and each grid point stores a number of channel characteristics in the form of a matrix, vector, or scalar.

[0096] Optionally, an example of a channel map can be shown in Figure 2. In this example, the physical cell is divided into two-dimensional grid points to obtain multiple grid points, each of which stores a number of channel features in the form of a matrix, vector, or scalar, such as a channel statistical covariance matrix, an angle spectrum, a delay spectrum, etc., that is, each grid point can correspond to a channel map or a sub-channel map in a channel map.

[0097] Among them, the channel statistical covariance matrix can indicate the spectrum basis of the channel spectrum, the angle spectrum is used to indicate the multipath angle of the channel spectrum, and the delay spectrum is used to indicate the multipath delay of the channel spectrum.

[0098] Optionally, the channel spectrum may include a spatial domain channel spectrum, a frequency domain channel spectrum, and a space-frequency channel spectrum. Among them, the spatial domain channel spectrum may include channel characteristics related to the spatial domain, such as the channel statistical covariance matrix and angle spectrum in the spatial domain. The frequency domain channel spectrum may include channel characteristics related to the frequency domain, such as the channel statistical covariance matrix and delay spectrum in the frequency domain. The space-frequency channel spectrum may include channel characteristics related to space and frequency (i.e., spatial and frequency domains), such as the channel statistical covariance matrix, angle spectrum and delay spectrum in space and frequency. In some embodiments, the space-frequency channel spectrum may also be referred to as a space-frequency joint channel spectrum, and accordingly, the channel spectrum basis of the space-frequency channel spectrum may be referred to as a space-frequency joint spectrum basis, or a joint basis.

[0099] Channel maps can be used to enable low-pilot-overhead channel detection between communication devices. For example, the channel map provides the channel covariance matrix at a specific location, and this priori information can be used to help reduce SRS pilot overhead.

[0100] Traditional channel map construction methods involve communication devices building a database based on historical data, establishing a mapping relationship between location information and channel characteristics. Given the limited historical measurement data, channel characteristics at unknown locations are often interpolated based on channel characteristics at known locations to obtain a channel map for the entire cell.

[0101] With the development of digital twin technology, channel twinning technology can be used to obtain channel maps, a map-based deterministic channel modeling solution. As shown in Figure 3, combined with a priori environmental maps, electromagnetic simulation is used to simulate the reflection, diffraction, and scattering characteristics of communication multipath, thereby obtaining deterministic channels for constructing channel maps.

[0102] Figure 4 is a schematic diagram of the communication device structure provided by an embodiment of the present application. As shown in Figure 4, both the wireless access network device and the terminal device may include a radio resource management / control (RRC) signaling interaction module, a multimedia access management / control (MAC) signaling interaction module, and a physical layer (PHY) signaling and data interaction module.

[0103] Among them, the RRC signaling interaction module is used to transmit RRC signaling, the MAC signaling interaction module is used to transmit MAC control unit (MAC-control element, MAC-CE) signaling, and the PHY signaling and data interaction module is used to transmit uplink / downlink control signaling and uplink / downlink data.

[0104] The core network equipment may include access and mobility management function (AMF) network elements, location management function (LMF) network elements / map management function (MMF) network elements, etc.

[0105] The AMF network element and the radio access network equipment can communicate through the control plane interface (such as the NG-C interface) between the radio access network equipment and the core network equipment, and the AMF network element and the LMF network element / MMF network element can communicate through the NLs interface.

[0106] Optionally, LMF network elements can be used to implement terminal device location estimation. In addition, LMF network elements / MMF network elements can be used to construct channel maps.

[0107] The AMF network element can be equivalent to a router for communication between the wireless access network device and the LMF network element / MMF network element. Optionally, after the LMF network element / MMF network element has constructed the channel map, it can send the channel map to the wireless access network device through the AMF network element.

[0108] Before communication devices can perform channel detection based on a channel map, they must transmit the channel map. Furthermore, because the electromagnetic environment changes unpredictably over time, the channel map must also be updated accordingly, necessitating frequent transmission of the channel map between communication devices.

[0109] In an existing channel spectrum transmission method, a first network element may first obtain a channel spectrum to be transmitted and divide the channel spectrum into multiple sub-channel spectra. The first network element then projects the channel spectrum basis corresponding to each of the multiple sub-channel spectra onto a DFT basis to obtain projection coefficients corresponding to each sub-channel spectrum. Finally, the first network element sends information to a second network element, indicating at least one non-zero value in the projection coefficient corresponding to each sub-channel spectrum and the index of the at least one non-zero value. Accordingly, upon receiving the information, the second network element may reconstruct the channel spectrum basis based on the information and then perform channel detection based on the reconstructed channel spectrum basis.

[0110] As an example, the first network element may be a core network device, and the second network element may be a wireless access network device.

[0111] As another example, the first network element may be a wireless access network device, and the second network element may be a terminal device.

[0112] In this method, the first network element may divide the channel spectrum into multiple spatial grids to obtain channel spectra corresponding to the multiple spatial grids. The channel spectrum corresponding to each of the multiple spatial grids may be referred to as a sub-channel spectrum.

[0113] As an example, the channel spectrum basis may be a space-frequency basis, a spatial domain basis, or a frequency domain basis.

[0114] In this method, the projection coefficient corresponding to each sub-channel spectrum satisfies: U=B×C, where B represents the DFT basis, U represents the basis of each sub-channel spectrum, and C represents the projection coefficient corresponding to the basis of each sub-channel spectrum.

[0115] However, when the first network element and the second network element transmit the channel map using this method, the transmission overhead between the first network element and the second network element is large.

[0116] To this end, the present application provides a communication method for solving the problem of high transmission overhead between a first network element and a second network element in the prior art.

[0117] In the technical solution of the present application, a first network element may send first information and second information to a second network element. The first information indicates a first multipath angle and / or a first multipath delay, and the second information indicates a projection coefficient of a channel spectrum basis for each sub-channel spectrum in the first channel spectrum. Accordingly, after receiving the first and second information, the second network element may reconstruct the first channel spectrum.

[0118] In the method, the first channel spectrum may be a channel spectrum to be transmitted. Optionally, the first channel spectrum may be a spatial channel spectrum, a frequency channel spectrum, or a space-frequency channel spectrum.

[0119] The first channel spectrum can be divided into multiple spatial grids to obtain multiple sub-channel spectra, and the multiple sub-channel spectra can correspond to the multiple spatial grids one by one.

[0120] The distance between any two spatial grids in these multiple spatial grids can be less than a distance threshold, the multipath angles of the two sub-channel spectra corresponding to any two spatial grids in these multiple spatial grids can be the same, and / or the multipath delays of the two sub-channel spectra corresponding to any two spatial grids in these multiple spatial grids can be the same.

[0121] The first multipath angle may be a multipath angle of the first channel spectrum, and the multipath angle of the first channel spectrum may be equal to the multipath angle of any sub-channel spectrum in the first channel spectrum. The first multipath delay may be a multipath delay of the first channel spectrum, and the multipath delay of the first channel spectrum may be equal to the multipath delay of any sub-channel spectrum in the first channel spectrum.

[0122] In this method, after receiving the first information and the second information, the second network element can reconstruct each sub-channel spectrum based on the first multipath angle and / or the first multipath delay and the projection coefficient of the channel spectrum basis of each sub-channel spectrum, that is, reconstruct the first channel spectrum.

[0123] In this method, the first network element only needs to send the first multipath angle and / or the first multipath delay to the second network element, without sending the multipath angle and / or multipath delay of each sub-channel spectrum, which is beneficial to reducing the transmission overhead between the first network element and the second network element.

[0124] In addition, the projection coefficient sent by the first network element to the second network element can be a vector instead of a matrix, which can also reduce the transmission overhead between the first network element and the second network element.

[0125] Next, this application will provide a detailed introduction to the solution of this application in conjunction with Figures 5 to 20.

[0126] FIG5 is a flow chart of a communication method provided in an embodiment of the present application. As shown in FIG5 , the communication method may include S501 to S505.

[0127] S501. A first network element obtains a first channel spectrum, which includes a first sub-channel spectrum and a second sub-channel spectrum. The multipath angle of the first sub-channel spectrum and the multipath angle of the second sub-channel spectrum are equal to the first multipath angle. The first multipath angle is the multipath angle of the first channel spectrum. The multipath delay of the first sub-channel spectrum and the multipath delay of the second sub-channel spectrum are equal to the first multipath delay. The first multipath delay is the multipath delay of the first channel spectrum.

[0128] As an example, the first network element may be a core network device as shown in Figure 4, and the second network element may be a radio access network device as shown in Figure 4. In this example, the first network element may construct a first channel map based on an LMF network element / MMF network element in the first network element.

[0129] As another example, the first network element may be a wireless access network device as shown in Figure 4, and the second network element may be a terminal device as shown in Figure 4. In this example, the first network element may obtain the first channel map from a core network device.

[0130] In this method, the first channel spectrum may be a channel spectrum to be transmitted. The first network element may divide the first channel spectrum into multiple spatial grids to obtain channel spectra corresponding to the multiple spatial grids. The channel spectrum corresponding to each of the multiple spatial grids may be referred to as a sub-channel spectrum. In other words, the first channel spectrum may include multiple sub-channel spectra. Optionally, the first sub-channel spectrum and the second sub-channel spectrum may be any two sub-channel spectra from the multiple sub-channel spectra.

[0131] The multipath angle of the first subchannel spectrum and the multipath angle of the second subchannel spectrum are equal to the first multipath angle, which can be understood as: the multipath angle of the first subchannel spectrum and the multipath angle of the second subchannel spectrum are the same, the multipath angle of the first subchannel spectrum is equal to the first multipath angle, and the multipath angle of the second subchannel spectrum is equal to the first multipath angle.

[0132] The fact that the multipath angles of the first and second subchannel patterns are identical can be understood as meaning that the array vectors reconstructed from the multipath angles of the first and second subchannel patterns are identical. Even if the first and second subchannel patterns have different multipath angles, they both fall within the first channel pattern. When reconstructing the subchannel pattern basis, the projection coefficients appear zero at these different multipath angles, and these different multipath angles do not affect the reconstruction result.

[0133] The multipath delay of the first subchannel spectrum and the multipath delay of the second subchannel spectrum are equal to the first multipath delay, which can be understood as: the multipath delay of the first subchannel spectrum is the same as the multipath delay of the second subchannel spectrum, the multipath delay of the first subchannel spectrum is equal to the first multipath delay, and the multipath delay of the second subchannel spectrum is equal to the first multipath delay.

[0134] The fact that the multipath delays of the first and second subchannel profiles are identical can be understood as follows: the subcarrier vectors reconstructed from the multipath delays of the first and second subchannel profiles are identical. Even if the first and second subchannel profiles have different multipath delays, they both fall within the first channel profile. When reconstructing the subchannel profile basis, the projection coefficients appear zero for these different multipath delays, and these different multipath delays do not affect the reconstruction result.

[0135] In this method, the first channel spectrum may be a spatial domain channel spectrum, a frequency domain channel spectrum, a space-frequency channel spectrum, or the like.

[0136] When the first channel spectrum is a spatial channel spectrum, the first channel spectrum may include features such as a channel statistical covariance matrix and an angular spectrum. Accordingly, each sub-channel spectrum in the first channel spectrum may also include features such as a channel statistical covariance matrix and an angular spectrum. That is, each sub-channel spectrum may indicate information such as the channel spectrum basis and multipath angle of each sub-channel spectrum.

[0137] When the first channel spectrum is a frequency-domain channel spectrum, the first channel spectrum may include features such as a channel statistical covariance matrix and a delay spectrum. Accordingly, each sub-channel spectrum in the first channel spectrum may also include features such as a channel statistical covariance matrix and a delay spectrum. That is, each sub-channel spectrum may indicate information such as the channel spectrum floor and multipath delay of each sub-channel spectrum.

[0138] When the first channel spectrum is a space-frequency channel spectrum, the first channel spectrum may include features such as a channel statistical covariance matrix, an angle spectrum, and a delay spectrum. Accordingly, each sub-channel spectrum in the first channel spectrum may also include features such as a channel statistical covariance matrix, an angle spectrum, and a delay spectrum. That is, each sub-channel spectrum may indicate information such as the channel spectrum floor, multipath angle, and multipath delay of each sub-channel spectrum.

[0139] In this method, the first sub-channel spectrum is adjacent to the second sub-channel spectrum. Here, the first sub-channel spectrum and the second sub-channel spectrum are adjacent, which may not be completely adjacent, but the distance between the spatial grids corresponding to the first sub-channel spectrum and the second sub-channel spectrum is within a preset distance threshold.

[0140] S502: A first network element sends first information to a second network element, where the first information indicates a first multipath angle and / or a first multipath delay. Correspondingly, the second network element receives the first information.

[0141] As an example, when the first channel profile is a space-frequency channel profile, a signal sent by the first network element may reach the second network element via multiple paths, where each of the multiple paths may include angle and delay characteristics, where the angle may include a horizontal angle and a vertical angle. In this case, the first information sent by the first network element to the second network element may indicate a first multipath angle and a first multipath delay.

[0142] As another example, when the first channel map is a spatial channel map, the signal sent by the first network element can reach the second network element through multiple paths, where each of the multiple paths can contain an angle feature. In this case, the first information sent by the first network element to the second network element can indicate a first multipath angle.

[0143] As another example, when the first channel map is a frequency domain channel map, the signal sent by the first network element can reach the second network element through multiple paths, where each of these multiple paths can contain a delay characteristic. In this case, the first information sent by the first network element to the second network element can indicate the first multipath delay.

[0144] In this method, due to the spatial continuity of the channel, the multipath angles in the first sub-channel spectrum and the second sub-channel spectrum are basically the same, and / or the multipath delays in the first sub-channel spectrum and the second sub-channel spectrum are basically the same. The first network element does not need to send the multipath angle and / or multipath delay of each sub-channel spectrum to the second network element, which is beneficial to reducing the transmission overhead between the first network element and the second network element.

[0145] S503: The first network element sends second information to the second network element. The second information indicates a first projection coefficient and a second projection coefficient, where the first projection coefficient is a projection coefficient of a channel spectrum basis of the first sub-channel spectrum, and the second projection coefficient is a projection coefficient of a channel spectrum basis of the second sub-channel spectrum. In response, the second network element receives the second information.

[0146] In this method, the projection coefficients of the channel spectrum basis of the first subchannel spectrum may be projection coefficients obtained by projecting the first subchannel spectrum onto an array vector and / or a subcarrier vector. The array may be an array of access network devices (or a base station array), and the subcarrier may be a subcarrier used for signal transmission between the first network element and the second network element.

[0147] The projection coefficients of the channel spectrum basis of the second sub-channel spectrum may also be projection coefficients obtained by projecting the second sub-channel spectrum onto the array vector and / or the sub-carrier vector.

[0148] As an example, when the first channel spectrum is a space-frequency channel spectrum, the projection coefficients of the channel spectrum basis of the first sub-channel spectrum may be projection coefficients obtained by projecting the first sub-channel spectrum basis onto the array vector and the sub-carrier vector.

[0149] As another example, when the first channel spectrum is a spatial channel spectrum, the projection coefficients of the channel spectrum basis of the first sub-channel spectrum may be projection coefficients obtained by projecting the first sub-channel spectrum basis onto the array vector.

[0150] As another example, when the first channel spectrum is a frequency domain channel spectrum, the projection coefficient of the channel spectrum basis of the first sub-channel spectrum may be a projection coefficient obtained by projecting the first sub-channel spectrum basis onto the subcarrier vector.

[0151] Next, this application will be described by taking the first channel spectrum as a space-frequency channel spectrum as an example.

[0152] In the present application, when the first channel spectrum is a space-frequency channel spectrum, the projection coefficient of the channel spectrum basis of the first sub-channel spectrum can satisfy formula (1):

[0153] Where U represents the channel spectrum basis of the first sub-channel spectrum, U H represents the conjugate transposed matrix of U, ρ(l) represents the projection coefficient of the channel spectrum basis of the first sub-channel spectrum, where l represents each element in the projection coefficient, e(θ l ,φ l ) represents the multipath angle (θ l ,φ l ) corresponding array vector, where θ lis the pitch angle (or vertical angle), φ l is the horizontal angle, e H (θ l ,φ l ) represents the conjugate transposed matrix of the array vector, e(τ l ) represents the subcarrier vector corresponding to the multipath delay, τ l represents the multipath delay, e * (τ l ) represents the conjugate matrix of the subcarrier vector, e T (τ l ) represents the transposed matrix of the subcarrier vector, ||.|| F represents the F matrix norm, represents the Kronecker product.

[0154] Among them, the subcarrier vector e(τ l ) can satisfy formula (2):

[0155] Among them, f i Indicates the frequency of the subcarrier, i can range from 0 to N-1.

[0156] For example, the base station array can be shown in FIG6. In this example, the base station array is a uniform array. In this example, the array vector e(θ l ,φ l ) can satisfy formula (3):

[0157] Among them, e h (θ l ,φ l ) can represent the array vector of the horizontal array, e v (θ l ) represents the array vector of the vertical array.

[0158] The array vector e of the horizontal array h (θ l ,φ l ) can satisfy formula (4):

[0159] Among them, D h is the horizontal array spacing, M h is the number of single horizontal arrays.

[0160] The array vector of the vertical array can satisfy formula (5):

[0161] Among them, D v is the vertical array spacing, M v is the number of single-polarization vertical arrays.

[0162] In this example, the total number of arrays in the base station array may be M=2M. h M v .

[0163] In this method, the calculation process of the projection coefficient of the channel spectrum basis of the second sub-channel spectrum can refer to the calculation process of the projection coefficient of the channel spectrum basis of the first sub-channel spectrum, and will not be repeated here.

[0164] In a possible implementation, the second information indicates the first projection coefficient, which may include: the second information may include a non-zero value in the first projection coefficient and an index of the non-zero value in the first projection coefficient.

[0165] In this method, the index of the non-zero value in the first projection coefficient can be used to indicate the position of the non-zero value in the first projection coefficient in the first projection coefficient.

[0166] The first network element can first calculate the projection coefficient of the channel spectrum basis of the first sub-channel spectrum, and the first projection coefficient can include at least one non-zero value, and then send each non-zero value in the at least one non-zero value and the index of each non-zero value to the second network element, so that the second network element can determine the position of each non-zero value in the first projection coefficient based on the index of each non-zero value in the at least one non-zero value, and then determine the first projection coefficient.

[0167] In this method, the first network element can send non-zero values ​​of the first projection coefficients instead of all values ​​to the second network element, which is conducive to reducing transmission overhead.

[0168] In one embodiment, the second information indicates the second projection coefficient, which may include: the second information may include a non-zero value in the second projection coefficient and an index of the non-zero value in the second projection coefficient.

[0169] In this method, the index of the non-zero value in the second projection coefficient can be used to indicate the position of the non-zero value in the second projection coefficient in the second projection coefficient.

[0170] The first network element can first calculate the projection coefficient of the channel spectrum basis of the second sub-channel spectrum, which can include at least one non-zero value, and then send each non-zero value in the at least one non-zero value and the index of each non-zero value to the second network element, so that the second network element can determine the position of each non-zero value in the second projection coefficient based on the index of each non-zero value in the at least one non-zero value, and then determine the second projection coefficient.

[0171] In this method, the first network element can send non-zero values ​​of the second projection coefficients instead of all values ​​to the second network element, which is conducive to reducing transmission overhead.

[0172] It can be understood that this embodiment is described by taking the example of the first channel spectrum including the first sub-channel spectrum and the second sub-channel spectrum. When the first channel spectrum includes multiple sub-channel spectrums, the method is also applicable.

[0173] For example, when the first channel spectrum also includes a third sub-channel spectrum, the first network element can first calculate the projection coefficients of the channel spectrum basis of each sub-channel spectrum in the three sub-channel spectra respectively to obtain three projection coefficients, and these three projection coefficients correspond one-to-one to the three sub-channel spectra; then the first network element sends the non-zero value and the index of the non-zero value in each of the three projection coefficients to the second network element, and finally the second network element can determine each projection coefficient based on the non-zero value and the index of the non-zero value in each projection coefficient.

[0174] Optionally, the first network element may also send the index of the sub-channel spectrum corresponding to each of the multiple projection coefficients to the second network element, so that the second network element may determine the position of the sub-channel spectrum corresponding to each projection coefficient in the first channel spectrum based on the index of the sub-channel spectrum corresponding to each projection coefficient.

[0175] In another embodiment, the second information indicates the second projection coefficient, which may include: the second information further includes a non-zero value in a difference between the second projection coefficient and the first projection coefficient and an index of the non-zero value in the difference.

[0176] In this embodiment, the first network element may first calculate the first projection coefficient and the second projection coefficient, and calculate the difference between the first projection coefficient and the second projection coefficient. The first network element then sends the non-zero value in the first projection coefficient, the index of the non-zero value in the first projection coefficient, the non-zero value in the difference between the second projection coefficient and the first projection coefficient, and the index of the non-zero value in the difference to the second network element. In this way, the second network element may determine the first projection coefficient based on the non-zero value in the first projection coefficient and the index of the non-zero value in the first projection coefficient, and then determine the second projection coefficient based on the non-zero value in the difference between the second projection coefficient and the first projection coefficient, the index of the non-zero value in the difference, and the first projection coefficient.

[0177] Among them, the second projection coefficient and the first projection coefficient can be vectors, the difference between the second projection coefficient and the first projection coefficient is also a vector, and the difference between the second projection coefficient and the first projection coefficient can be the difference between the elements at corresponding positions in the second projection coefficient and the first projection coefficient.

[0178] In this method, there may be a common subspace between the second subchannel spectrum and the first subchannel spectrum, so that the difference between the first projection coefficient and the second projection coefficient may be zero, or some elements in the difference may be zero, and the number of non-zero values ​​of the difference may be smaller than the non-zero values ​​in the second projection coefficient. This can reduce the number of non-zero values ​​sent by the first network element, which is conducive to reducing transmission overhead.

[0179] It can be understood that this embodiment is described by taking the example of the first channel spectrum including the first sub-channel spectrum and the second sub-channel spectrum. When the first channel spectrum includes multiple sub-channel spectrums, the method is also applicable.

[0180] For example, when the first channel spectrum also includes a third sub-channel spectrum, the first network element can first calculate the projection coefficient of the channel spectrum basis of each sub-channel spectrum in the three sub-channel spectra respectively to obtain three projection coefficients, and the three projection coefficients correspond one-to-one to the three sub-channel spectra; then the first network element sends the non-zero value in the first projection coefficient, the index of the non-zero value in the first projection coefficient, the non-zero value in the difference between the projection coefficient of each sub-channel spectrum basis in the second sub-channel spectrum basis and the third sub-channel spectrum basis and the first projection coefficient, and the index of the non-zero value in the difference to the second network element. Finally, the second network element can determine the first projection coefficient based on the non-zero value in the first projection coefficient and the index of the non-zero value in the first projection coefficient, and determine the second projection coefficient and the third projection coefficient respectively according to the non-zero value in the difference between the projection coefficient of each sub-channel spectrum basis in the second sub-channel spectrum basis and the third sub-channel spectrum basis and the first projection coefficient, and the index of the non-zero value in the difference.

[0181] The third projection coefficient may be a projection coefficient of the channel spectrum basis of the third sub-channel spectrum.

[0182] Optionally, the first network element may also send the index of the sub-channel spectrum corresponding to each of the multiple projection coefficients to the second network element, so that the second network element may determine the position of the sub-channel spectrum corresponding to each projection coefficient in the first channel spectrum based on the index of the sub-channel spectrum corresponding to each projection coefficient.

[0183] In another possible implementation, there may be a common subspace between the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum. The common subspace between the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum may be referred to as a common channel spectrum basis.

[0184] Assume that the channel spectrum basis of the first sub-channel spectrum is U0, the channel spectrum basis of the second sub-channel spectrum is U1, and the common subspace between the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum is v01 , v 01 Any vector v in satisfies formula (6):

[0185] in, and are the projection matrices of U0 and U1 respectively, is the conjugate transposed matrix of U0, is the conjugate transposed matrix of U1.

[0186] The channel spectrum basis of the first sub-channel spectrum may include the common channel spectrum basis and / or the first non-common channel spectrum basis, and the direct sum of the common channel spectrum basis and the first non-common channel spectrum basis is equal to the channel spectrum basis of the first sub-channel spectrum.

[0187] Assume that U0 and v 01 The orthogonal subspace is D0, then D0 can be the non-public subspace in the first sub-channel spectrum, that is, the first non-public channel spectrum basis, D0, v 01 and U0 can satisfy:

[0188] Optionally, in some embodiments, all elements in D0 may be zero, that is, the channel spectrum basis of the first sub-channel spectrum may not include the first non-common channel spectrum basis.

[0189] In this implementation, the projection coefficient of the channel spectrum basis of the first subchannel spectrum (i.e., the first projection coefficient) may include a first subspace projection coefficient and / or a second subspace projection coefficient, wherein the first subspace projection coefficient is the projection coefficient of the common channel spectrum basis, and the second subspace projection coefficient is the projection coefficient of the first non-common channel spectrum basis.

[0190] In this implementation, the second information indicates the first projection coefficient, which may include: the second information includes a non-zero value in the first subspace projection coefficient, an index of the non-zero value in the first subspace projection coefficient, a non-zero value in the second subspace projection coefficient, and an index of the non-zero value in the second subspace projection coefficient.

[0191] In this method, the first network element can first calculate the first subspace projection coefficient and the second subspace projection coefficient, and then send the second information to the second network element. After receiving the second information, the second network element can determine the first subspace projection coefficient based on the non-zero value in the first subspace projection coefficient and the index of the non-zero value in the first subspace projection coefficient, and determine the second subspace projection coefficient based on the non-zero value in the second subspace projection coefficient and the index of the non-zero value in the second subspace projection coefficient, and then restore the common channel spectrum basis and the first non-public channel spectrum basis according to the first subspace projection coefficient and the second subspace projection coefficient, and perform a direct sum of the common channel spectrum basis and the first non-public channel spectrum basis to obtain the channel spectrum basis of the first subchannel spectrum.

[0192] The channel spectrum basis of the second sub-channel spectrum may include the common channel spectrum basis and / or the second non-common channel spectrum basis, and the direct sum of the common channel spectrum basis and the second non-common channel spectrum basis is equal to the channel spectrum basis of the second sub-channel spectrum.

[0193] Assume that U1 and v 01 The orthogonal subspace is D1, then D1 can be the non-public subspace in the second sub-channel spectrum, that is, the second non-public channel spectrum basis, D1, v 01 and U1 can satisfy:

[0194] Optionally, in some embodiments, all elements in D1 may be zero, that is, the channel spectrum basis of the second sub-channel spectrum may not include the first non-common channel spectrum basis.

[0195] In this implementation, the projection coefficient of the channel spectrum basis of the second subchannel spectrum (i.e., the second projection coefficient) may include the first subspace projection coefficient and / or the third subspace projection coefficient, wherein the first subspace projection coefficient is the projection coefficient of the common channel spectrum basis, and the third subspace projection coefficient is the projection coefficient of the second non-common channel spectrum basis.

[0196] In this implementation, the second information indicates the second projection coefficient, which may include: the second information further includes a non-zero value in the third subspace projection coefficient and an index of the non-zero value in the third subspace projection coefficient.

[0197] In this method, the first network element can first calculate the third subspace projection coefficient, and then send the second information to the second network element. After receiving the second information, the second network element can determine the third subspace projection coefficient based on the non-zero value in the third subspace projection coefficient and the index of the non-zero value in the third subspace projection coefficient, and then restore the common channel spectrum basis and the second non-public channel spectrum basis according to the first subspace projection coefficient and the third subspace projection coefficient, and directly sum the common channel spectrum basis and the second non-public channel spectrum basis to obtain the channel spectrum basis of the second subchannel spectrum.

[0198] In this method, the first subspace projection coefficient is the projection coefficient corresponding to the common subspace of the channel spectrum basis of the first subchannel spectrum and the channel spectrum basis of the second subchannel spectrum. The first network element can send the first subspace projection coefficient to the second network element only once, which is conducive to saving transmission overhead.

[0199] It can be understood that this embodiment is described by taking the example of the first channel spectrum including the first sub-channel spectrum and the second sub-channel spectrum. When the first channel spectrum includes multiple sub-channel spectrums, the method is also applicable.

[0200] For example, when the first channel spectrum also includes a third sub-channel spectrum, the first network element can respectively calculate the common subspace and non-common subspace between the channel spectrum basis of each sub-channel spectrum in the second sub-channel spectrum and the third sub-channel spectrum and the channel spectrum basis of the first sub-channel spectrum, and then calculate the projection coefficients of the common subspace and non-common subspace between the channel spectrum basis of each sub-channel spectrum and the channel spectrum basis of the first sub-channel spectrum; then the first network element sends the non-zero values ​​and the indexes of the non-zero values ​​in the projection coefficients of the common subspace and non-common subspace between the channel spectrum basis of each sub-channel spectrum and the channel spectrum basis of the first sub-channel spectrum to the second network element, so that the second network element can respectively determine the second projection coefficient and the third projection coefficient based on the non-zero values ​​and the indexes of the non-zero values ​​in the projection coefficients of the common subspace and non-common subspace between the channel spectrum basis of each sub-channel spectrum and the channel spectrum basis of the first sub-channel spectrum.

[0201] The third projection coefficient may be a projection coefficient of the channel spectrum basis of the third sub-channel spectrum.

[0202] Optionally, the first network element may also send the index of the sub-channel spectrum corresponding to each of the multiple projection coefficients to the second network element, so that the second network element may determine the position of the sub-channel spectrum corresponding to each projection coefficient in the first channel spectrum based on the index of the sub-channel spectrum corresponding to each projection coefficient.

[0203] Optionally, in some embodiments, the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum may not have a common subspace, that is, v 01 The elements in can all be zero.

[0204] S504: The second network element reconstructs the array vector and / or subcarrier vector based on the first information.

[0205] Optionally, the first network element may further send third information to the second network element, where the third information may indicate the arrangement of the base station array and / or the number of subcarriers. Correspondingly, the second network element may receive the third information.

[0206] In this method, the second network element can calculate the array vector based on the first multipath angle and the arrangement of the base station array. The calculation method of the array vector can refer to the aforementioned formula (3) and will not be repeated here.

[0207] And / or, the second network element may calculate the subcarrier vector based on the first multipath delay and the number of subcarriers. The calculation method of the subcarrier vector may refer to the aforementioned formula (2) and will not be repeated here.

[0208] As an example, when the first channel spectrum is a space-frequency channel spectrum, the second network element can calculate the array vector based on the first multipath angle and the arrangement of the base station array, and calculate the subcarrier vector based on the first multipath delay and the number of subcarriers.

[0209] S505: The second network element reconstructs the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum based on the second information.

[0210] In some embodiments, the second information directly indicates the first projection coefficient and the second projection coefficient. For example, the second information may include the first projection coefficient and the second projection coefficient. The second network element may then determine the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum based on the first projection coefficient and the second projection coefficient, respectively. The second network element may then reconstruct the first sub-channel spectrum based on the channel spectrum basis of the first sub-channel spectrum and the first multipath angle and / or the first multipath delay in the first information, and reconstruct the second sub-channel spectrum based on the channel spectrum basis of the second sub-channel spectrum and the first multipath angle and / or the first multipath delay in the first information.

[0211] Taking the first projection coefficient as an example, the method for the second network element to determine the channel spectrum basis of the first sub-channel spectrum based on the first projection coefficient may include: constructing an array vector and / or a subcarrier vector based on the first multipath angle and / or the first multipath delay, and then reconstructing the first matrix based on the first projection coefficient, the array vector and / or the subcarrier vector, and then obtaining the channel spectrum basis of the reconstructed first sub-channel spectrum based on the first matrix.

[0212] In this example, the first matrix can satisfy formula (7):

[0213] in, is the first matrix.

[0214] In this example, the second network element may calculate the first matrix based on formula (7).

[0215] Optionally, the second network element may perform singular value decomposition (SVD) on the first matrix to obtain a channel spectrum basis of the reconstructed first sub-channel spectrum. The channel spectrum basis of the first sub-channel spectrum and the first matrix may satisfy formula (8):

[0216] in, represents the channel spectrum basis of the reconstructed first sub-channel spectrum, express The conjugate transposed matrix of .

[0217] In this method, the method for the second network element to determine the channel spectrum basis of the second sub-channel spectrum based on the second projection coefficient can refer to the aforementioned method for the second network element to determine the channel spectrum basis of the first sub-channel spectrum based on the first projection coefficient, which will not be repeated here.

[0218] In some embodiments, the second information indirectly indicates the first projection coefficient and the second projection coefficient.

[0219] As an example, the second information may include the non-zero value in the first projection coefficient and the index of the non-zero value in the first projection coefficient, and the non-zero value in the second projection coefficient and the index of the non-zero value in the second projection coefficient.

[0220] In this example, the second network element can determine the first projection coefficient based on the non-zero value in the first projection coefficient and the index of the non-zero value in the first projection coefficient, and determine the second projection coefficient based on the non-zero value in the second projection coefficient and the index of the non-zero value in the second projection coefficient, and then determine the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum based on the first projection coefficient and the second projection coefficient respectively, and finally reconstruct the first sub-channel spectrum based on the channel spectrum basis of the first sub-channel spectrum and the first multipath angle and / or the first multipath delay in the first information, and reconstruct the second sub-channel spectrum based on the channel spectrum basis of the second sub-channel spectrum and the first multipath angle and / or the first multipath delay in the first information.

[0221] Among them, the method for the second network element to determine the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum based on the first projection coefficient and the second projection coefficient respectively can refer to the above embodiment and will not be repeated here.

[0222] As another example, the second information may include non-zero values ​​in the first projection coefficient and indices of the non-zero values ​​in the first projection coefficient, and non-zero values ​​in the difference between the second projection coefficient and the first projection coefficient and indices of the non-zero values ​​in the difference.

[0223] In this example, the second network element can determine the first projection coefficient based on the non-zero value in the first projection coefficient and the index of the non-zero value in the first projection coefficient, and determine the second projection coefficient based on the first projection coefficient, the non-zero value in the difference between the second projection coefficient and the first projection coefficient and the index of the non-zero value in the difference, and then determine the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum based on the first projection coefficient and the second projection coefficient respectively, and finally reconstruct the first sub-channel spectrum based on the channel spectrum basis of the first sub-channel spectrum and the first multipath angle and / or first multipath delay in the first information, and reconstruct the second sub-channel spectrum based on the channel spectrum basis of the second sub-channel spectrum and the first multipath angle and / or first multipath delay in the first information.

[0224] As another example, the second information may include: non-zero values ​​in the first subspace projection coefficients, indices of non-zero values ​​in the first subspace projection coefficients, non-zero values ​​in the second subspace projection coefficients, indices of non-zero values ​​in the second subspace projection coefficients, non-zero values ​​in the third subspace projection coefficients, and indices of non-zero values ​​in the third subspace projection coefficients.

[0225] In this example, the second network element can determine the first subspace projection coefficient based on the non-zero value in the first subspace projection coefficient and the index of the non-zero value in the first subspace projection coefficient, and determine the second subspace projection coefficient based on the non-zero value in the second subspace projection coefficient and the index of the non-zero value in the second subspace projection coefficient, and determine the third subspace projection coefficient based on the non-zero value in the third subspace projection coefficient and the index of the non-zero value in the third subspace projection coefficient.

[0226] Then, the second network element can obtain the reconstructed common channel spectrum basis based on the first subspace projection coefficient, obtain the reconstructed first non-common channel spectrum basis based on the second subspace projection coefficient, and obtain the reconstructed second non-common channel spectrum basis based on the third subspace projection coefficient.

[0227] Finally, the second network element may calculate a first sub-channel spectrum basis based on the common channel spectrum basis and the first non-common channel spectrum basis, and calculate a second sub-channel spectrum basis based on the common channel spectrum basis and the second non-common channel spectrum basis.

[0228] In this method, the method in which the second network element can obtain the reconstructed common channel spectrum basis based on the first subspace projection coefficient, the method in which the first non-public channel spectrum basis is reconstructed based on the second subspace projection coefficient, and the method in which the second non-public channel spectrum basis is reconstructed based on the third subspace projection coefficient can all refer to the method in which the second network element reconstructs the channel spectrum basis of the first subchannel spectrum based on the first projection coefficient in the aforementioned embodiment, and will not be repeated here.

[0229] In this method, the first sub-channel spectrum basis is equal to the direct sum of the common channel spectrum basis and the first non-common channel spectrum basis, and the second sub-channel spectrum basis is equal to the direct sum of the common channel spectrum basis and the second non-common channel spectrum basis.

[0230] Optionally, the second information may also include an index of the first sub-channel spectrum and an index of the second sub-channel spectrum, so that the second network element can determine the first channel spectrum based on the reconstructed first sub-channel spectrum and the reconstructed second sub-channel spectrum, the index of the first sub-channel spectrum and the index of the second sub-channel spectrum.

[0231] As an example, the index of the first sub-channel map may be the grid index corresponding to the first sub-channel map, where the grid index corresponding to the first sub-channel map indicates the grid corresponding to the first sub-channel map. The index of the second sub-channel map may be the grid index corresponding to the second sub-channel map, where the grid index corresponding to the second sub-channel map indicates the grid corresponding to the second sub-channel map.

[0232] It can be understood that the calculation formulas of the above-mentioned first projection coefficient and the first matrix are explained using the example of the first channel spectrum being a space-frequency channel spectrum. When the first channel spectrum is a space-domain channel spectrum or a frequency-domain channel spectrum, the calculation formulas of the first projection coefficient and the first matrix are different.

[0233] For example, when the first channel spectrum is a spatial channel spectrum, formula (1) and formula (7) do not include matrices related to the subcarrier vector, that is, they do not include the conjugate matrix of the subcarrier vector and the transposed matrix of the subcarrier vector.

[0234] For another example, when the first channel spectrum is a frequency domain channel spectrum, formula (1) and formula (7) do not include matrices related to the array vector, that is, they do not include the array vector and the conjugate transposed matrix of the array vector.

[0235] In this method, the channel characteristics of the first channel map can be transmitted in layers.

[0236] As shown in Figure 7, assuming that the first channel spectrum includes a first sub-channel spectrum and a second sub-channel spectrum, the first network element can first divide the first channel spectrum into a first channel characteristic and a second channel characteristic, where the first channel characteristic includes the multipath angle of the first channel spectrum and / or the multipath delay of the first channel spectrum, and the second channel characteristic includes the channel spectrum basis of the first sub-channel spectrum and the channel spectrum basis of the second sub-channel spectrum. The first network element then sends first information and second information to the second network element, where the first information indicates the first multipath angle and / or the first multipath delay, and the second information indicates the projection coefficient of the channel spectrum basis of the first sub-channel spectrum and the projection coefficient of the channel spectrum basis of the second sub-channel spectrum.

[0237] In this example, the box may represent the first channel feature of the first channel map, and the shaded portion may represent the second channel feature.

[0238] Next, this application will take the first channel spectrum as a space-frequency channel spectrum as an example to provide a detailed introduction to the interaction between the first network element and the second network element.

[0239] FIG8 is a flow chart of a communication method provided in one embodiment of the present application.

[0240] S801: A first network element obtains first information, where the first information indicates a first multipath angle and a first multipath delay. The first multipath angle is a multipath angle of a first channel spectrum, and the first multipath delay is a multipath delay of the first channel spectrum.

[0241] Assuming that the first channel spectrum can be as shown in FIG9 , the first channel spectrum can be divided into five grids: grid 0, grid 1, grid 2, grid 3 and grid 4. Each of the five grids can correspond to a sub-channel spectrum.

[0242] In this example, grid 0 may correspond to sub-channel spectrum 1, grid 1 may correspond to sub-channel spectrum 2, grid 2 may correspond to sub-channel spectrum 3, grid 3 may correspond to sub-channel spectrum 4, and grid 4 may correspond to sub-channel spectrum 5.

[0243] In this example, the multipath angles of any two of the five sub-channel spectra may be the same, and the multipath delays of any two of the five sub-channel spectra may also be the same.

[0244] In this method, the first multipath angle may be equal to the multipath angle of any one of the five subchannel spectra. The first multipath delay may be equal to the multipath delay of any one of the five subchannel spectra.

[0245] S802: The first network element sends first information to the second network element. Correspondingly, the second network element receives the first information.

[0246] S803: The first network element calculates a projection coefficient of a channel spectrum basis of each sub-channel spectrum in the first channel spectrum.

[0247] In this method, the first network element may respectively calculate the projection coefficient corresponding to the channel spectrum basis of each sub-channel spectrum in the five sub-channel spectra to obtain five projection coefficients.

[0248] As shown in Figure 10, assuming that U0 represents the channel spectrum basis of sub-channel spectrum 1, the projection coefficient of the channel spectrum basis of sub-channel spectrum 1 calculated by the first network element is ρ0. assuming that U1 represents the channel spectrum basis of sub-channel spectrum 2, the projection coefficient of the channel spectrum basis of sub-channel spectrum 2 calculated by the first network element is ρ1. assuming that U2 represents the channel spectrum basis of sub-channel spectrum 3, the projection coefficient of the channel spectrum basis of sub-channel spectrum 3 calculated by the first network element is ρ2. assuming that U3 represents the channel spectrum basis of sub-channel spectrum 4, the projection coefficient of the channel spectrum basis of sub-channel spectrum 4 calculated by the first network element is ρ3. assuming that U4 represents the channel spectrum basis of sub-channel spectrum 5, the projection coefficient of the channel spectrum basis of sub-channel spectrum 5 calculated by the first network element is ρ4.

[0249] In this method, the method for calculating the projection coefficient of the channel spectrum basis of each sub-channel spectrum can refer to the method for calculating the first projection coefficient in the aforementioned embodiment, and will not be repeated here.

[0250] S804: The first network element sends second information to the second network element, where the second information includes projection coefficients of the channel spectrum basis of each sub-channel spectrum. Correspondingly, the second network element may receive the second information.

[0251] Optionally, the second information may further include an index of each sub-channel spectrum, where the index of each sub-channel spectrum is used to indicate the position of each sub-channel spectrum in the first channel spectrum. The index of each sub-channel spectrum may correspond one-to-one to the projection coefficient of each sub-channel spectrum.

[0252] As an example, the index of each sub-channel map may be a grid index corresponding to each sub-channel map, and the grid index corresponding to each sub-channel map is used to indicate the grid corresponding to each sub-channel map.

[0253] Optionally, the first network element may further send third information to the second network element, where the third information is used to indicate the arrangement mode and number of subcarriers of the base station array. Correspondingly, the second network element may receive the third information.

[0254] In addition, when the arrangement of the base station array and / or the number of subcarriers is updated, the first network element may also send the updated arrangement of the base station array and / or the updated number of subcarriers to the second network element.

[0255] S805: The second network element reconstructs a first matrix corresponding to each sub-channel spectrum based on the first information and the second information.

[0256] Taking sub-channel spectrum 1 as an example, the second network element may reconstruct the first matrix corresponding to sub-channel spectrum 1 based on the projection coefficients of the channel spectrum basis of sub-channel spectrum 1.

[0257] Specifically, the second network element may first calculate an array vector based on the first multipath angle and the arrangement of the base station array, and calculate a subcarrier vector based on the first multipath delay and the number of subcarriers. Then, the second network element may calculate a first matrix corresponding to subchannel spectrum 1 based on the projection coefficients of the channel spectrum basis of subchannel spectrum 1, the array vector, and the subcarrier vector.

[0258] In this method, the calculation method of the array vector and the subcarrier vector can refer to the above embodiment and will not be repeated here.

[0259] In this method, the calculation method of the first matrix corresponding to the sub-channel spectrum 1 can refer to the calculation method of the first matrix corresponding to the first sub-channel spectrum in the aforementioned embodiment, which will not be repeated here.

[0260] Optionally, the second network element may determine the projection coefficient of the channel spectrum basis of the sub-channel spectrum 1 from the received five projection coefficients based on the index of the sub-channel spectrum 1.

[0261] In this method, the calculation method of the first matrix corresponding to any sub-channel map from sub-channel map 2 to sub-channel map 5 is similar to the calculation method of the first matrix corresponding to sub-channel map 1, and will not be repeated here.

[0262] S806: The second network element reconstructs the channel spectrum basis of each sub-channel spectrum based on the first matrix corresponding to each sub-channel spectrum.

[0263] In this method, the second network element may reconstruct the channel spectrum basis of sub-channel spectrum 1 based on the first matrix corresponding to sub-channel spectrum 1. The second network element may reconstruct the channel spectrum basis of sub-channel spectrum 2 based on the first matrix corresponding to sub-channel spectrum 2. The second network element may reconstruct the channel spectrum basis of sub-channel spectrum 3 based on the first matrix corresponding to sub-channel spectrum 3. The second network element may reconstruct the channel spectrum basis of sub-channel spectrum 4 based on the first matrix corresponding to sub-channel spectrum 4. The second network element may reconstruct the channel spectrum basis of sub-channel spectrum 5 based on the first matrix corresponding to sub-channel spectrum 5.

[0264] The method for reconstructing the channel spectrum basis of each sub-channel spectrum may refer to the relevant content in the aforementioned embodiment and will not be repeated here.

[0265] S807: The second network element reconstructs the first channel spectrum based on the channel spectrum basis of each sub-channel spectrum, the first multipath angle, and the first multipath delay.

[0266] In this method, the second network element can first reconstruct each sub-channel spectrum based on the channel spectrum basis, the first multipath angle and the first multipath delay of each sub-channel spectrum, and then integrate each sub-channel spectrum into the first channel spectrum based on the index of each sub-channel spectrum.

[0267] Optionally, the method for the second network element to reconstruct the first channel spectrum may be as shown in FIG11 .

[0268] Optionally, in some embodiments, S802 may also be located after S803 or S804.

[0269] Optionally, the communication method may also be as shown in FIG12 .

[0270] S1201: A first network element obtains first information, where the first information indicates a first multipath angle and a first multipath delay. The first multipath angle is a multipath angle of a first channel spectrum, and the first multipath delay is a multipath delay of the first channel spectrum.

[0271] In this method, S1201 may refer to S801 and will not be described in detail here.

[0272] S1202: The first network element sends first information to the second network element. Correspondingly, the second network element receives the first information.

[0273] S1203: The first network element calculates a projection coefficient of a channel spectrum basis of each sub-channel spectrum in the first channel spectrum.

[0274] In this method, the method for calculating the projection coefficient of the channel spectrum basis of each sub-channel spectrum can refer to the method for calculating the first projection coefficient in the aforementioned embodiment, and will not be repeated here.

[0275] S1204: The first network element calculates a difference between a projection coefficient of a channel spectrum basis of each sub-channel spectrum in other sub-channel spectrums in the first channel spectrum and a projection coefficient of a channel spectrum basis of a target sub-channel spectrum.

[0276] In this method, the target sub-channel spectrum may be any sub-channel spectrum in the first channel spectrum. The other sub-channel spectrums may include all sub-channel spectrums in the first channel spectrum except the target sub-channel spectrum.

[0277] Taking Figure 9 as an example, assuming that the target sub-channel map can be sub-channel map 1 corresponding to grid 0, the other sub-channel maps can include sub-channel map 2 corresponding to grid 1, sub-channel map 3 corresponding to grid 2, sub-channel map 4 corresponding to grid 3 and sub-channel map 5 corresponding to grid 4.

[0278] The first network element can calculate the first difference between the projection coefficients of the channel spectrum basis of sub-channel map 2 and the projection coefficients of the channel spectrum basis of sub-channel map 1, the second difference between the projection coefficients of the channel spectrum basis of sub-channel map 3 and the projection coefficients of the channel spectrum basis of sub-channel map 1, the third difference between the projection coefficients of the channel spectrum basis of sub-channel map 4 and the projection coefficients of the channel spectrum basis of sub-channel map 1, and the fourth difference between the projection coefficients of the channel spectrum basis of sub-channel map 5 and the projection coefficients of the channel spectrum basis of sub-channel map 1.

[0279] As shown in FIG. 13 , Δρ1 may represent a first difference, Δρ2 may represent a second difference, Δρ3 may represent a third difference, and Δρ4 may represent a fourth difference.

[0280] S1205: The first network element sends second information to the second network element, where the second information indicates the projection coefficient of the channel spectrum basis of the target sub-channel spectrum and the difference between the projection coefficient of the channel spectrum basis of each sub-channel spectrum in the other sub-channel spectrums and the projection coefficient of the channel spectrum basis of the target sub-channel spectrum. In response, the second network element receives the second information.

[0281] Taking FIG. 13 as an example, in one implementation, the second information may include a projection coefficient of the channel spectrum basis of the target sub-channel spectrum, a first difference, a second difference, a third difference, and a fourth difference.

[0282] Optionally, in another implementation, the second information may include the projection coefficient of the channel spectrum basis of the target sub-channel spectrum, the non-zero value in the first difference and the index of the non-zero value in the first difference, the non-zero value in the second difference and the index of the non-zero value in the second difference, the non-zero value in the third difference and the index of the non-zero value in the third difference, the non-zero value in the fourth difference and the index of the non-zero value in the fourth difference.

[0283] S1206: The second network element determines a channel spectrum basis of each sub-channel spectrum in the first channel spectrum based on the second information.

[0284] In one implementation, when the second information includes the projection coefficient of the channel spectrum basis of the target sub-channel spectrum, the first difference, the second difference, the third difference and the fourth difference, the second network element can determine the projection coefficient of the channel spectrum basis of sub-channel spectrum 2 based on the projection coefficient of the channel spectrum basis of the target sub-channel spectrum and the first difference, and determine the projection coefficient of the channel spectrum basis of sub-channel spectrum 3 based on the projection coefficient of the channel spectrum basis of the target sub-channel spectrum and the second difference, and determine the projection coefficient of the channel spectrum basis of sub-channel spectrum 4 based on the projection coefficient of the channel spectrum basis of the target sub-channel spectrum and the third difference, and determine the projection coefficient of the channel spectrum basis of sub-channel spectrum 5 based on the projection coefficient of the channel spectrum basis of the target sub-channel spectrum and the fourth difference.

[0285] Optionally, in another implementation, when the second information includes the projection coefficient of the channel spectrum basis of the target sub-channel spectrum, the non-zero value in the first difference and the index of the non-zero value in the first difference, the non-zero value in the second difference and the index of the non-zero value in the second difference, the non-zero value in the third difference and the index of the non-zero value in the third difference, the non-zero value in the fourth difference and the index of the non-zero value in the fourth difference, the second network element may first determine the first difference based on the non-zero value in the first difference and the index of the non-zero value in the first difference, and the non-zero value in the second difference based on the non-zero value in the second difference and the index of the non-zero value in the fourth difference. The second difference is determined by an index, and the third difference is determined based on the non-zero value in the third difference and the index of the non-zero value in the third difference, and the fourth difference is determined based on the non-zero value in the fourth difference and the index of the non-zero value in the fourth difference, and then the projection coefficient of the channel spectrum basis of sub-channel spectrum 2, the projection coefficient of the channel spectrum basis of sub-channel spectrum 3, the projection coefficient of the channel spectrum basis of sub-channel spectrum 4 and the projection coefficient of the channel spectrum basis of sub-channel spectrum 5 are determined based on the projection coefficient of the channel spectrum basis of the target sub-channel spectrum, the first difference, the second difference, the third difference and the fourth difference.

[0286] Optionally, the second information may also include an index of each sub-channel map in the first channel map.

[0287] Optionally, the first network element may further send third information to the second network element, where the third information is used to indicate the arrangement mode and number of subcarriers of the base station array. Correspondingly, the second network element may receive the third information.

[0288] S1207: The second network element reconstructs a first matrix corresponding to each sub-channel spectrum in the first channel spectrum.

[0289] In this method, S1207 may refer to the aforementioned S805 and will not be described in detail here.

[0290] S1208: The second network element reconstructs the channel spectrum basis of each sub-channel spectrum based on the first matrix corresponding to each sub-channel spectrum.

[0291] In this method, S1208 may refer to S806 and will not be described in detail here.

[0292] S1209: The second network element reconstructs the first channel spectrum based on the channel spectrum basis of each sub-channel spectrum, the first multipath angle, and the first multipath delay.

[0293] In this method, S1209 may refer to S807 and will not be described in detail here.

[0294] Optionally, the method for the second network element to reconstruct the first channel spectrum may be as shown in FIG14 .

[0295] Optionally, in some embodiments, S1202 may also be located after S1203, or after S1204, or after S1205.

[0296] Optionally, the communication method may also be as shown in FIG15 .

[0297] S1501: A first network element obtains first information, where the first information indicates a first multipath angle and a first multipath delay. The first multipath angle is a multipath angle of a first channel spectrum, and the first multipath delay is a multipath delay of the first channel spectrum.

[0298] In this method, S1501 may refer to S801 and will not be described in detail here.

[0299] S1502: The first network element sends first information to the second network element. Correspondingly, the second network element receives the first information.

[0300] S1503: The first network element calculates a common subspace and a non-common subspace between the channel spectrum basis of the target sub-channel spectrum in the first channel spectrum and the channel spectrum basis of each sub-channel spectrum in other sub-channel spectra.

[0301] In this method, the target sub-channel spectrum may be any sub-channel spectrum in the first channel spectrum. The other sub-channel spectrums may include every sub-channel spectrum in the first channel spectrum except the target sub-channel spectrum.

[0302] Taking Figure 9 as an example, assuming that the target sub-channel map can be sub-channel map 1 corresponding to grid 0, the other sub-channel maps can include sub-channel map 2 corresponding to grid 1, sub-channel map 3 corresponding to grid 2, sub-channel map 4 corresponding to grid 3 and sub-channel map 5 corresponding to grid 4.

[0303] The first network element may calculate a first common subspace between the channel spectrum basis of subchannel spectrum 2 and the channel spectrum basis of subchannel spectrum 1, and then determine a non-common subspace of the channel spectrum basis of subchannel spectrum 2 based on the first common subspace.

[0304] The calculation method of the first common subspace can refer to the calculation method of v in the above embodiment. 01 The calculation process of is not described here in detail.

[0305] The direct sum of the non-common subspace of the channel spectrum basis of sub-channel spectrum 2 and the first common subspace is equal to the channel spectrum basis of the channel spectrum basis of sub-channel spectrum 2.

[0306] In addition, the first network element may calculate a second common subspace between the channel spectrum basis of subchannel spectrum 3 and the channel spectrum basis of subchannel spectrum 1, and then determine a non-common subspace of the channel spectrum basis of subchannel spectrum 3 based on the second common subspace.

[0307] The first network element may calculate a third common subspace between the channel spectrum basis of subchannel spectrum 4 and the channel spectrum basis of subchannel spectrum 1, and then determine a non-common subspace of the channel spectrum basis of subchannel spectrum 4 based on the third common subspace.

[0308] The first network element may calculate a fourth common subspace between the channel spectrum basis of sub-channel spectrum 5 and the channel spectrum basis of sub-channel spectrum 1, and then determine a non-common subspace of sub-channel spectrum 5 based on the fourth common subspace.

[0309] Optionally, the non-common subspace of the channel spectrum basis of sub-channel spectrum 1 may be determined based on the common subspace between the channel spectrum basis of any sub-channel spectrum in other sub-channel spectrums and the channel spectrum basis of sub-channel spectrum 1.

[0310] For example, the non-common subspace of the channel spectrum basis of sub-channel spectrum 1 can be determined based on the first common subspace. In this example, the direct sum of the non-common subspace of the channel spectrum basis of sub-channel spectrum 1 and the first common subspace is equal to the channel spectrum basis of sub-channel spectrum 1.

[0311] S1504: The first network element calculates projection coefficients of a common subspace and projection coefficients of a non-common subspace between the channel spectrum basis of the target subchannel spectrum and the channel spectrum basis of other subchannel spectrums in the first channel spectrum.

[0312] In the method, the first network element may calculate the projection coefficient of the first common subspace, the projection coefficient of the second common subspace, the projection coefficient of the third common subspace, and the projection coefficient of the fourth common subspace.

[0313] In addition, the first network element may also calculate the projection coefficient of the non-public subspace of the channel spectrum basis of each sub-channel spectrum.

[0314] The calculation method of the projection coefficients of each common subspace and each non-common subspace can refer to formula (1), which will not be repeated here.

[0315] In this method, the method by which the first network element calculates the projection coefficients of the common subspace and the projection coefficients of the non-common subspace between the channel spectrum basis of the target subchannel spectrum in the first channel spectrum and the channel spectrum basis of other subchannel spectra can be shown in FIG15 .

[0316] As shown in Figure 16, assuming that V 01 represents the first common subspace, V 02 represents the second common subspace, V 03 represents the third common subspace, V 04 Denotes the fourth common subspace. D0 denotes the non-common subspace of subchannel spectrum 1, D1 denotes the non-common subspace of subchannel spectrum 2, D2 denotes the non-common subspace of subchannel spectrum 3, D3 denotes the non-common subspace of subchannel spectrum 4, and D4 denotes the non-common subspace of subchannel spectrum 5.

[0317] ρ 01 represents the projection coefficient of the first common subspace, ρ 02 represents the projection coefficient of the second common subspace, ρ 03 represents the projection coefficient of the third common subspace, ρ 04 represents the projection coefficient of the fourth common subspace. ρ0 represents the projection coefficient of the non-common subspace of subchannel spectrum 1, ρ1 represents the projection coefficient of the non-common subspace of subchannel spectrum 2, ρ2 represents the projection coefficient of the non-common subspace of subchannel spectrum 3, ρ3 represents the projection coefficient of the non-common subspace of subchannel spectrum 4, and ρ4 represents the projection coefficient of the non-common subspace of subchannel spectrum 5.

[0318] S1505: The first network element sends second information to the second network element, where the second information indicates projection coefficients of a common subspace and projection coefficients of a non-common subspace between the channel spectrum basis of the target subchannel spectrum and the channel spectrum basis of the other subchannel spectrums in the first channel spectrum. In response, the second network element receives the second information.

[0319] In one implementation, the second information may include projection coefficients of a common subspace and projection coefficients of a non-common subspace between the channel spectrum basis of the target subchannel spectrum and the channel spectrum basis of other subchannel spectrums in the first channel spectrum.

[0320] In another implementation, the second information may include the non-zero values ​​and indexes of the non-zero values ​​of the projection coefficients of the common subspace between the channel spectrum basis of the target subchannel spectrum and the channel spectrum basis of other subchannel spectra in the first channel spectrum and the non-zero values ​​and indexes of the non-zero values ​​of the projection coefficients of the non-common subspace.

[0321] S1506: The second network element reconstructs the common subspace and the non-common subspace between the channel spectrum basis of the target sub-channel spectrum and the channel spectrum basis of other sub-channel spectrums in the first channel spectrum based on the second information.

[0322] In one possible implementation, when the second information includes the projection coefficients of the common subspace between the channel spectrum basis of the target subchannel spectrum and the channel spectrum basis of other subchannel spectra in the first channel spectrum, and the projection coefficients of the non-common subspace, the second network element can calculate each common subspace based on the projection coefficient of each common subspace, and calculate each non-common subspace based on the projection coefficient of each non-common subspace.

[0323] In this method, the calculation method of each common subspace and each non-common subspace can refer to formula (7) and formula (8), which will not be repeated here.

[0324] In another possible implementation, when the second information includes the non-zero values ​​and indexes of the non-zero values ​​of the projection coefficients of the common subspace between the channel spectrum basis of the target subchannel spectrum and the channel spectrum basis of other subchannel spectra in the first channel spectrum, and the non-zero values ​​and indexes of the non-zero values ​​of the projection coefficients of the non-common subspace, the second network element can first determine each common subspace based on the non-zero values ​​and indexes of the non-zero values ​​of the projection coefficients of each common subspace, and determine each non-common subspace based on the non-zero values ​​and indexes of the projection coefficients of each non-common subspace, and then calculate each common subspace based on the projection coefficients of each common subspace, and calculate each non-common subspace based on the projection coefficients of each non-common subspace.

[0325] S1507: The second network element reconstructs the channel spectrum basis of the first channel spectrum based on the common subspace and the non-common subspace between the channel spectrum basis of the target sub-channel spectrum and the channel spectrum basis of other sub-channel spectra in the first channel spectrum.

[0326] In this method, the second network element may reconstruct the channel spectrum basis of the sub-channel spectrum 2 based on the first common subspace and the non-common subspace of the channel spectrum basis of the sub-channel spectrum 2.

[0327] The channel spectrum basis of sub-channel spectrum 2 is equal to the direct sum of the first common subspace and the non-common subspace of the channel spectrum basis of sub-channel spectrum 2.

[0328] As an example, suppose represents the first common subspace calculated by the second network element, represents the non-public subspace of the channel spectrum basis of the sub-channel spectrum 2 calculated by the second network element. The channel spectrum basis of the sub-channel spectrum 2 reconstructed by the second network element is but and Can satisfy:

[0329] In addition, the second network element may reconstruct the channel spectrum basis of the sub-channel spectrum 3 based on the second common subspace and the non-common subspace of the channel spectrum basis of the sub-channel spectrum 3 .

[0330] The second network element may reconstruct the channel spectrum basis of the sub-channel spectrum 4 based on the third common subspace and the non-common subspace of the channel spectrum basis of the sub-channel spectrum 4 .

[0331] The second network element may reconstruct the channel spectrum basis of the sub-channel spectrum 5 based on the fourth common subspace and the non-common subspace of the channel spectrum basis of the sub-channel spectrum 5 .

[0332] Optionally, the second network element may reconstruct the channel spectrum basis of the sub-channel spectrum 1 based on any common subspace.

[0333] As an example, when the first network element determines a non-common subspace of a channel spectrum basis of sub-channel spectrum 1 based on the first common subspace, the second network element may reconstruct, based on the first common subspace, the channel spectrum basis of sub-channel spectrum 1. The channel spectrum basis of sub-channel spectrum 1 may be equal to the direct sum of the first common subspace and the non-common subspace of the channel spectrum basis of sub-channel spectrum 1.

[0334] Optionally, in this example, the first network element may further send indication information to the second network element, where the indication information is used to instruct the first network element to determine a non-public subspace of the channel spectrum basis of sub-channel spectrum 1 based on the first public subspace. Accordingly, after receiving the indication information, the second network element may reconstruct the channel spectrum basis of sub-channel spectrum 1 based on the calculated first public subspace.

[0335] S1508: The second network element reconstructs the first channel spectrum based on the channel spectrum basis, the first multipath angle, and the first multipath delay of the first channel spectrum.

[0336] In this method, after the second network element obtains the projection coefficients of the common subspace and the non-common subspace of the channel spectrum basis of each subchannel spectrum, it first reconstructs each subchannel spectrum based on the channel spectrum basis of each subchannel spectrum, the first multipath angle and the first multipath delay, and then integrates each subchannel spectrum based on the index of each subchannel spectrum to obtain the first channel spectrum.

[0337] Optionally, the method for the second network element to reconstruct the first channel spectrum may be as shown in FIG17 .

[0338] Optionally, in some embodiments, S1502 may also be located after S1503, or after S1504, or after S1505.

[0339] FIG18 is a schematic diagram of a communication device according to an embodiment of the present application. As shown in FIG18 , the communication device 1800 may include an acquisition module 1801 and a sending module 1802 .

[0340] As an example, the communication device 1800 may be used to implement the method of the embodiment shown in Figure 5. The acquiring module 1801 may be used to execute S501, and the sending module 1802 may be used to execute S502 and S503.

[0341] Optionally, the communication device 1800 may further include a processing module 1803 .

[0342] As another example, the communication device 1800 may be used to implement the method of the embodiment shown in Figure 8. The acquisition module 1801 may be used to execute S801, the sending module 1802 may be used to execute S802 and S804, and the processing module 1803 may be used to execute S803.

[0343] As another example, the communication device 1800 may be used to implement the method of the embodiment shown in Figure 12. The acquisition module 1801 may be used to execute S1201, the sending module 1802 may be used to execute S1202 and S1205, and the processing module 1803 may be used to execute S1203 and S1204.

[0344] As another example, the communication device 1800 may be used to implement the method of the embodiment shown in Figure 15. The acquisition module 1801 may be used to execute S1501, the sending module 1802 may be used to execute S1502 and S1505, and the processing module 1803 may be used to execute S1503 and S1504.

[0345] Optionally, the communication device 1800 can be applied to the first network element, or can be applied to a chip in the first network element.

[0346] FIG19 is a schematic diagram of a communication device according to another embodiment of the present application. As shown in FIG19 , the communication device 1900 may include a receiving module 1901 and a processing module 1902 .

[0347] As an example, the communication device 1900 may be used to implement the method of the embodiment shown in Figure 5. The receiving module 1901 may be used to execute S502 and S503, and the processing module 1902 may be used to execute S504 and S505.

[0348] As another example, the communication device 1900 may be used to implement the method of the embodiment shown in Figure 8. The receiving module 1901 may be used to execute S802 and S804, and the processing module 1902 may be used to execute S805 to S807.

[0349] As another example, the communication device 1900 may be used to implement the method of the embodiment shown in Figure 12. The receiving module 1901 may be used to execute S1202 and S1205, and the processing module 1902 may be used to execute S1206 to S1209.

[0350] As another example, the communication device 1900 may be used to implement the method of the embodiment shown in Figure 15. The receiving module 1901 may be used to execute S1502 and S1505, and the processing module 1902 may be used to execute S1506 to S1508.

[0351] Optionally, the communication device 1900 can be applied to the second network element, or can be applied to a chip in the second network element.

[0352] Figure 20 is a schematic diagram of a communication device provided in yet another embodiment of the present application. As shown in Figure 20, communication device 2000 includes a processor 2001 and an interface circuit 2002. Processor 2001 and interface circuit 2002 are coupled to each other. It will be appreciated that interface circuit 2002 may be a transceiver or an input / output interface. Optionally, communication device 2000 may further include a memory 2003 for storing instructions executed by processor 2001, storing input data required by processor 2001 to execute instructions, or storing data generated after processor 2001 executes instructions.

[0353] As an example, the processor 2001 may be used to implement the functions of the processing module 1803 , and the interface circuit 2002 may be used to implement the functions of the acquisition module 1801 and the sending module 1802 .

[0354] As another example, the processor 2001 may be used to implement the functions of the aforementioned processing module 1902 , and the interface circuit 2002 may be used to implement the functions of the aforementioned receiving module 1901 .

[0355] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal device. Of course, the processor and the storage medium can also be present in a network device or a terminal device as discrete components.

[0356] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive.

[0357] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0358] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A communication method, characterized in that, Applied to a first network element, the method includes: Obtain a first channel map, where the first channel map includes a first sub-channel map and a second sub-channel map. The multipath angles of the first sub-channel map and the second sub-channel map are equal to a first multipath angle, and the first multipath angle is the multipath angle of the first channel map. The multipath delays of the first sub-channel map and the second sub-channel map are equal to a first multipath delay, and the first multipath delay is the multipath delay of the first channel map; Send first information indicating the first multipath angle and / or the first multipath delay; Send second information indicating a first projection coefficient and a second projection coefficient. The first projection coefficient is the projection coefficient of the channel map basis of the first sub-channel map, and the second projection coefficient is the projection coefficient of the channel map basis of the second sub-channel map.

2. The method according to claim 1, wherein The second information indicating the first projection coefficient includes: the second information contains the non-zero values in the first projection coefficient and the indices of the non-zero values in the first projection coefficient.

3. The method according to claim 2, wherein The second information indicating the second projection coefficient includes: the second information further contains the non-zero values in the second projection coefficient and the indices of the non-zero values in the second projection coefficient.

4. The method according to claim 2, wherein The second information indicating the second projection coefficient includes: the second information further contains the non-zero values in the difference between the second projection coefficient and the first projection coefficient and the indices of the non-zero values in the difference.

5. The method according to claim 1, characterized in that The channel map basis of the first sub-channel map includes a common channel map basis and / or a first non-common channel map basis. The first projection coefficient includes a first subspace projection coefficient and / or a second subspace projection coefficient. The first subspace projection coefficient is the projection coefficient of the common channel map basis, and the second subspace projection coefficient is the projection coefficient of the first non-common channel map basis; Wherein, the common channel map basis is the common subspace of the channel map basis of the first sub-channel map and the channel map basis of the second sub-channel map, and the direct sum of the common channel map basis and the first non-common channel map basis is equal to the channel map basis of the first sub-channel map.

6. The method according to claim 5, characterized in that, The second information indicating the first projection coefficient includes: the second information contains the non-zero values in the first subspace projection coefficient, the indices of the non-zero values in the first subspace projection coefficient, the non-zero values in the second subspace projection coefficient, and the indices of the non-zero values in the second subspace projection coefficient.

7. The method according to claim 6, wherein The channel map basis of the second sub-channel map includes the common channel map basis and / or a second non-common channel map basis. The second projection coefficient includes the first subspace projection coefficient and / or a third subspace projection coefficient. The third subspace projection coefficient is the projection coefficient of the second non-common channel map basis, and the direct sum of the common channel map basis and the second non-common channel map basis is equal to the channel map basis of the second sub-channel map; The second information indicates a second projection coefficient, including: the second information further includes non-zero values in the third subspace projection coefficient and indices of the non-zero values in the third subspace projection coefficient.

8. The method according to any one of claims 1 to 7, characterized in that, The first sub-channel map is adjacent to the second sub-channel map.

9. A communication method, characterized in that, Applied to a second network element, the method includes: Receiving first information, the first information indicating a first multipath angle and / or a first multipath delay, the first multipath angle being the multipath angle of the first channel map, the first multipath angle being equal to the multipath angle of a first sub-channel map in the first channel map and the multipath angle of a second sub-channel map in the first channel map, the first multipath delay being the multipath delay of the first channel map, the first multipath delay being equal to the multipath delay of the first sub-channel map and the multipath delay of the second sub-channel map; Receiving second information, the second information indicating a first projection coefficient and a second projection coefficient, the first projection coefficient being the projection coefficient of the channel map basis of the first sub-channel map, the second projection coefficient being the projection coefficient of the channel map basis of the second sub-channel map; Reconstructing an array vector and / or a subcarrier vector based on the first information; Reconstructing the channel map basis of the first sub-channel map and the channel map basis of the second sub-channel map based on the second information.

10. The method according to claim 9, characterized in that, The second information indicates a first projection coefficient, including: the second information includes non-zero values in the first projection coefficient and indices of the non-zero values in the first projection coefficient.

11. The method according to claim 10, wherein The second information indicates a second projection coefficient, including: the second information further includes non-zero values in the second projection coefficient and indices of the non-zero values in the second projection coefficient.

12. The method according to claim 10, characterized in that The second information indicates a second projection coefficient, including: the second information further includes non-zero values in the difference between the second projection coefficient and the first projection coefficient and indices of the non-zero values in the difference; The method further includes: Determining the second projection coefficient based on the first projection coefficient, the non-zero values in the difference, and the indices of the non-zero values in the difference; Reconstructing the channel map basis of the second sub-channel map based on the second projection coefficient.

13. The method according to claim 9, wherein The channel map basis of the first sub-channel map includes a common channel map basis and / or a first non-common channel map basis, the first projection coefficient includes a first subspace projection coefficient and / or a second subspace projection coefficient, the first subspace projection coefficient being the projection coefficient of the common channel map basis, the second subspace projection coefficient being the projection coefficient of the first non-common channel map basis; Wherein, the common channel map basis is a common subspace of the channel map basis of the first sub-channel map and the channel map basis of the second sub-channel map, and the direct sum of the common channel map basis and the first non-common channel map basis is equal to the channel map basis of the first sub-channel map.

14. The method according to claim 13, characterized in that The second information indicates a first projection coefficient, including: the second information includes non-zero values in the first subspace projection coefficient, indices of non-zero values in the first subspace projection coefficient, non-zero values in the second subspace projection coefficient, and indices of non-zero values in the second subspace projection coefficient; The channel map basis for reconstructing the first sub-channel map based on the second information includes: Determining the first subspace projection coefficient based on non-zero values in the first subspace projection coefficient and indices of non-zero values in the first subspace projection coefficient; Reconstructing the common channel map basis based on the first subspace projection coefficient; Determining the second subspace projection coefficient based on non-zero values in the second subspace projection coefficient and indices of non-zero values in the second subspace projection coefficient; Reconstructing the first non-common channel map basis based on the second subspace projection coefficient; Determining the channel map basis of the first sub-channel map based on the common channel map basis and the first non-common channel map basis.

15. The method according to claim 14, wherein The channel map basis of the second sub-channel map includes the common channel map basis and / or a second non-common channel map basis, the second projection coefficient includes the first subspace projection coefficient and / or a third subspace projection coefficient, the third subspace projection coefficient is the projection coefficient of the second non-common channel map basis, and the direct sum of the common channel map basis and the second non-common channel map basis is equal to the channel map basis of the second sub-channel map; The second information indicates a second projection coefficient, including: the second information further includes non-zero values in the third subspace projection coefficient and indices of non-zero values in the third subspace projection coefficient; The channel map basis for reconstructing the second sub-channel map based on the second information includes: Determining the third subspace projection coefficient based on non-zero values in the third subspace projection coefficient and indices of non-zero values in the third subspace projection coefficient; Reconstructing the second non-common channel map basis based on the third subspace projection coefficient; Determining the channel map basis of the second sub-channel map based on the common channel map basis and the second non-common channel map basis.

16. The method according to any one of claims 9 to 15, characterized in that The first sub-channel map is adjacent to the second sub-channel map.

17. A communication device, characterized in that, Includes functional modules for implementing the method according to any one of claims 1 to 16.

18. A communication device, characterized in that, Includes: A memory and a processor; The memory is used to store program instructions; The processor is used to execute the program instructions in the memory to implement the method according to any one of claims 1 to 16.

19. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores program code for computer execution, and the program code includes instructions for implementing the method according to any one of claims 1 to 16.

20. A computer program product, characterized in that, The computer program product contains instructions for implementing the method according to any one of claims 1 to 16.

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