Communication method and related apparatus

Abstract

Embodiments of the present application provide a communication method and a related apparatus. The method comprises: acquiring first indication information, the first indication information being used for indicating a reference energy ratio of a space-frequency joint basis after projection onto a downlink channel; on the basis of the energy ratio and the current downlink channel, determining a first space-frequency joint basis matrix that needs to be reported; and sending first feedback information, wherein the first feedback information comprises the first space-frequency joint basis matrix or a first basis difference matrix, and the first basis difference matrix comprises a difference portion between the first space-frequency joint basis matrix and a reported second space-frequency joint basis matrix. By means of the embodiments of the present application, the performance of using a DMRS to assist in updating an SRS channel is improved.

Description

A communication method and related device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 20, 2023, with application number 202311762628.0, and invention name “A communication method and related device”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] The Sounding Reference Signal (SRS), commonly referred to as the uplink sounding signal or sounding signal, is primarily used to estimate uplink channel quality for uplink scheduling, uplink timing advance (TA), and uplink beam management. In time division duplex (TDD) systems, channel symmetry allows for downlink channel quality estimation. In current communication systems, SRS is transmitted periodically to obtain full uplink channel information. With the increase in the U6G frequency band (i.e., the upper half of the 6 GHz band, 6425-7125 MHz), channel time variation accelerates, propagation loss increases, and uplink SRS channel aging becomes more severe. A potential solution to SRS channel aging is to use uplink DMRS to assist SRS measurement. This approach leverages space-frequency statistical information and uses the DMRS instantaneous channel to perform channel extrapolation, thereby recovering (partial or full) full channel information on both ends. In this solution, the terminal is required to report the space-frequency joint statistical basis U and statistical eigenvector Σ to the base station for subsequent channel extrapolation.

[0004] The base station configures or instructs the terminal in the high-level parameters to report the number of space-frequency joint statistical bases U and statistical characteristic vectors Σ, and reserves a maximum resource for the terminal in advance. The terminal periodically reports the space-frequency joint statistical base and statistical characteristic vector Σ on this resource. However, when the SRS update period is long, the channel extrapolation performance will degrade, resulting in a decrease in the performance of DMRS-assisted updating of the SRS channel. Summary of the Invention

[0005] The embodiments of the present application disclose a communication method and related apparatus, which can improve the performance of updating an SRS channel using DMRS assistance.

[0006] In a first aspect, an embodiment of the present application provides a communication method, the method comprising:

[0007] Acquire first indication information, where the first indication information is used to indicate a reference energy ratio projected onto a downlink channel by a space-frequency joint basis;

[0008] Determining a first space-frequency joint basis matrix to be reported according to the energy proportion and the current downlink channel;

[0009] Sending first feedback information, wherein the first feedback information includes the first space-frequency joint basis or a first basis difference matrix, and the first basis difference matrix includes a difference between the first space-frequency joint basis matrix and a reported second space-frequency joint basis matrix.

[0010] In the above method, the network device sends a reference energy ratio to the terminal device, and the terminal device determines the space-frequency joint basis required by the network device based on the latest downlink channel conditions and the reference energy ratio, instead of using a fixed number of space-frequency joint basis. Therefore, the number of space-frequency joint basis obtained is more accurate. Therefore, when the network device subsequently updates the SRS channel with DMRS assistance based on a more accurate number of space-frequency joint basis, the performance of channel extrapolation will not decrease, thereby improving the performance of updating the SRS channel with DMRS assistance. Optionally, when reporting the space-frequency joint basis matrix, the difference compared to the history, that is, the first differential basis matrix, can also be reported, instead of reporting the complete space-frequency joint basis matrix, which reduces the time-frequency resources occupied during reporting and improves reporting efficiency.

[0011] In combination with the first aspect, in a possible implementation, the first feedback information also includes a first vector difference matrix, which is a matrix composed of the difference parts of the first vector matrix and the second vector matrix. The first vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the first space-frequency joint basis matrix on the diagonal elements, and the second vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the second space-frequency joint basis matrix on the diagonal elements.

[0012] In this implementation, in addition to reporting the differential part of the space-frequency joint basis matrix, the differential component of the eigenvector matrix, that is, the first vector differential matrix, can also be uploaded, which further reduces the time-frequency resources occupied during reporting and improves reporting efficiency.

[0013] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in another possible implementation, determining the first space-frequency joint basis matrix to be reported based on the energy proportion and the current downlink channel includes:

[0014] A first space-frequency joint basis matrix is ​​selected from the initial space-frequency joint basis matrix according to the energy proportion, wherein the reported second space-frequency joint basis matrix is ​​also selected from the initial space-frequency joint basis matrix, and the initial space-frequency joint basis matrix is ​​obtained by eigendecomposing the space-frequency statistical covariance matrix of the downlink channel.

[0015] In this implementation, there is no need to re-perform eigendecomposition on the downlink channel to determine the first space-frequency joint basis matrix. Instead, the previously generated initial space-frequency joint basis matrix is ​​used and the first space-frequency joint basis matrix is ​​directly selected from the initial space-frequency joint basis matrix. Since the downlink channel is not re-decomposed, computational overhead is saved and the efficiency of determining the first space-frequency joint basis matrix is ​​improved.

[0016] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in yet another possible implementation, the following further includes:

[0017] Second indication information is received, where the second indication information is used to instruct reporting of the first feedback information.

[0018] It can be understood that the first feedback information is reported only when the second indication information sent by the network device is received, thereby avoiding invalid reporting and saving communication overhead and computing overhead of both the network device and the terminal device.

[0019] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in yet another possible implementation, the following further includes:

[0020] Receive third indication information, where the third indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to carry the first basis difference matrix.

[0021] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in yet another possible implementation, the following further includes:

[0022] Second feedback information is sent, where the second feedback information is used to indicate the number of joint space-frequency basis in the first basis difference matrix.

[0023] In this method, the number of space-frequency joint bases in the first basis difference matrix is ​​indicated to the network device, so that the network device can allocate specific time-frequency resources in a targeted manner according to the number of space-frequency joint bases, avoiding the problem of insufficient or wasted time-frequency resources.

[0024] In combination with the first aspect, or any of the foregoing possible implementations of the first aspect, in another possible implementation, obtaining the first indication information includes:

[0025] Receive first indication information.

[0026] In this implementation, the terminal device may obtain the first indication information by directly receiving it from the network device.

[0027] In a second aspect, an embodiment of the present application provides a communication method, characterized by including:

[0028] Sending first indication information, where the first indication information is used to indicate a reference energy ratio projected onto a downlink channel by the space-frequency joint basis;

[0029] Receive first feedback information, wherein the first feedback information includes a first space-frequency joint basis matrix or a first basis difference matrix, the first basis difference matrix includes a difference between the first space-frequency joint basis matrix and a reported second space-frequency joint basis matrix, and the reference capability ratio is used to determine the first space-frequency joint basis matrix.

[0030] In the above method, the network device sends a reference energy ratio to the terminal device, and the terminal device determines the space-frequency joint basis required by the network device based on the latest downlink channel conditions and the reference energy ratio, instead of using a fixed number of space-frequency joint basis. Therefore, the number of space-frequency joint basis obtained is more accurate. Therefore, when the network device subsequently updates the SRS channel with DMRS assistance based on a more accurate number of space-frequency joint basis, the performance of channel extrapolation will not decrease, thereby improving the performance of updating the SRS channel with DMRS assistance. Optionally, when reporting the space-frequency joint basis matrix, the difference compared to the history, that is, the first differential basis matrix, can also be reported, instead of reporting the complete space-frequency joint basis matrix, which reduces the time-frequency resources occupied during reporting and improves reporting efficiency.

[0031] In combination with the second aspect, in another possible implementation, the first feedback information also includes a first vector difference matrix, which is a matrix composed of the difference parts of the first vector matrix and the second vector matrix. The first vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the first space-frequency joint basis matrix on the diagonal elements, and the second vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the second space-frequency joint basis matrix on the diagonal elements.

[0032] In this implementation, in addition to reporting the differential part of the space-frequency joint basis matrix, the differential component of the eigenvector matrix, that is, the first vector differential matrix, can also be uploaded, which further reduces the time-frequency resources occupied during reporting and improves reporting efficiency.

[0033] In combination with the second aspect, or any of the foregoing possible implementations of the second aspect, in yet another possible implementation, the following further includes:

[0034] Send second indication information, where the second indication information is used to instruct reporting of the first feedback information.

[0035] It can be understood that the terminal device can report the first feedback information only when instructed to report by the second indication information, thereby avoiding invalid reporting and saving communication overhead and computing overhead of both the network device and the terminal device.

[0036] In combination with the second aspect, or any of the foregoing possible implementations of the second aspect, in yet another possible implementation, the following further includes:

[0037] Determine that the first feedback information can continue to be reported.

[0038] It can be understood that the subsequent process of reporting the first feedback information is triggered only when it is determined that the information can be reported, thereby saving communication overhead and computing overhead of both the network device and the terminal device.

[0039] In combination with the second aspect, or any of the foregoing possible implementations of the second aspect, in yet another possible implementation, the following further includes:

[0040] Send third indication information, where the third indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to carry the first basis difference matrix.

[0041] In combination with the second aspect, or any of the foregoing possible implementations of the second aspect, in yet another possible implementation, the following further includes:

[0042] Second feedback information is received, where the second feedback information is used to indicate the number of joint space-frequency basis in the first basis difference matrix.

[0043] In this method, the number of space-frequency joint bases in the first basis difference matrix is ​​indicated to the network device, so that the network device can allocate specific time-frequency resources in a targeted manner according to the number of space-frequency joint bases, avoiding the problem of insufficient or wasted time-frequency resources.

[0044] In combination with the second aspect, or any of the foregoing possible implementations of the second aspect, in yet another possible implementation, the following further includes:

[0045] According to the first basis difference matrix, a demodulation reference signal DMRS is used to assist in updating a sounding reference signal SRS channel.

[0046] It can be understood that the first space-frequency joint basis matrix can be determined based on the first basis difference matrix and the existing second space-frequency joint basis matrix. Since the first space-frequency joint basis matrix is ​​a relatively accurate space-frequency joint basis matrix, the performance of using DMRS to assist in updating the SRS channel based on the first space-frequency joint basis matrix is ​​better.

[0047] In a third aspect, an embodiment of the present application provides a communication method, the method comprising:

[0048] Sending third feedback information, wherein the third feedback information includes a third joint space-frequency basis matrix;

[0049] Fourth feedback information is sent, where the fourth feedback information is used to indicate a first energy proportion, where the first energy proportion includes an energy proportion projected onto a current downlink channel by a joint space-frequency basis.

[0050] In the above method, when the terminal device reports the space-frequency joint basis matrix to the network device, it will also report the first energy ratio determined based on the current space-frequency joint basis matrix and the current channel, so that the network device can determine whether the current first energy ratio meets the requirements, thereby facilitating the decision on how to make subsequent adjustments so that the network device can obtain an appropriate number of space-frequency joint basis matrices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0051] In combination with the third aspect, in a possible implementation manner, the fourth feedback information includes the value of the first energy proportion.

[0052] In combination with the third aspect, or any of the foregoing possible implementations of the third aspect, in yet another possible implementation, the fourth feedback information includes an index corresponding to the first energy proportion.

[0053] It can be understood that indicating in an index manner requires less field overhead, which can save communication resources and improve communication efficiency.

[0054] In combination with the third aspect, or any of the foregoing possible implementations of the third aspect, in yet another possible implementation, the following further includes:

[0055] receiving fourth indication information, wherein the fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix;

[0056] Fifth feedback information is sent, where the fifth feedback information includes a fourth joint space-frequency basis matrix.

[0057] It can be understood that re-uploading the space-frequency joint basis matrix can meet the latest requirements of network devices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0058] In combination with the third aspect, or any of the foregoing possible implementations of the third aspect, in yet another possible implementation, the following further includes:

[0059] receiving fourth indication information, wherein the fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix;

[0060] Send sixth feedback information, wherein the sixth feedback information includes a difference matrix, and the difference matrix includes a difference between a space-frequency joint basis in a fourth space-frequency joint basis matrix and a space-frequency joint basis in the third space-frequency joint basis matrix.

[0061] It can be understood that uploading the differential matrix allows the network device to determine the latest space-frequency joint basis matrix, thereby meeting the latest requirements of the network device and improving the performance of using DMRS to assist in updating the SRS channel.

[0062] In combination with the third aspect, or any of the foregoing possible implementations of the third aspect, in yet another possible implementation, the following further includes:

[0063] receiving fifth indication information, wherein the fifth indication information is used to indicate a second energy proportion, where the second energy proportion includes an energy proportion projected onto a current downlink channel by a joint space-frequency basis;

[0064] The fourth space-frequency joint basis is determined according to the second energy ratio.

[0065] It can be understood that the fourth space-frequency joint basis matrix determined according to the second energy proportion newly indicated by the network device can better meet the needs of the network device, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0066] In combination with the third aspect, or any one of the above-mentioned possible implementations of the third aspect, in another possible implementation, the third feedback information also includes a third vector matrix, and the third vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the third space-frequency joint basis matrix on the diagonal elements.

[0067] In combination with the third aspect, or any of the foregoing possible implementations of the third aspect, in yet another possible implementation, the sending the fourth feedback information includes:

[0068] The fourth feedback information is sent periodically.

[0069] It can be understood that periodically sending the fourth feedback information can enable the network device to promptly determine whether the current energy ratio meets the requirements, and thus determine whether the reported space-frequency joint basis matrix needs to be adjusted depending on the situation, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0070] In a fourth aspect, an embodiment of the present application provides a communication method, the method comprising:

[0071] receiving third feedback information, wherein the third feedback information includes a third joint space-frequency basis matrix;

[0072] Fourth feedback information is received, where the fourth feedback information is used to indicate a first energy proportion, and the first energy proportion includes an energy proportion projected onto a current downlink channel by a joint space-frequency basis.

[0073] In the above method, when the terminal device reports the space-frequency joint basis matrix to the network device, it will also report the first energy ratio determined based on the current space-frequency joint basis matrix and the current channel, so that the network device can determine whether the current first energy ratio meets the requirements, thereby facilitating the decision on how to make subsequent adjustments so that the network device can obtain an appropriate number of space-frequency joint basis matrices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0074] In combination with the fourth aspect, in a possible implementation manner, the fourth feedback information includes the value of the first energy proportion.

[0075] In combination with the fourth aspect, or any one of the foregoing possible implementations of the fourth aspect, in another possible implementation, the fourth feedback information includes an index corresponding to the first energy proportion.

[0076] It can be understood that indicating in an index manner requires less field overhead, which can save communication resources and improve communication efficiency.

[0077] In combination with the fourth aspect, or any of the foregoing possible implementations of the fourth aspect, in yet another possible implementation, the following further includes:

[0078] Sending fourth indication information, wherein the fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix;

[0079] Fifth feedback information is received, where the fifth feedback information includes a fourth joint space-frequency basis matrix.

[0080] It can be understood that re-uploading the space-frequency joint basis matrix can meet the latest requirements of network devices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0081] In combination with the fourth aspect, or any of the foregoing possible implementations of the fourth aspect, in yet another possible implementation, the following further includes:

[0082] Sending fourth indication information, wherein the fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix;

[0083] Sixth feedback information is received, wherein the sixth feedback information includes a difference matrix, and the difference matrix includes a difference between a space-frequency joint basis in a fourth space-frequency joint basis matrix and a space-frequency joint basis in the third space-frequency joint basis matrix.

[0084] It can be understood that uploading the differential matrix allows the network device to determine the latest space-frequency joint basis matrix, thereby meeting the latest requirements of the network device and improving the performance of using DMRS to assist in updating the SRS channel.

[0085] In combination with the fourth aspect, or any of the foregoing possible implementations of the fourth aspect, in yet another possible implementation, the following further includes:

[0086] Determine whether the first energy ratio is less than a preset energy ratio threshold.

[0087] It can be understood that the network device will trigger the operation of sending the fourth indication information only when it determines that the first energy proportion is less than the preset energy proportion threshold, avoiding the problem of waste of communication overhead and computing overhead caused by frequent or untimely sending.

[0088] In combination with the fourth aspect, or any of the foregoing possible implementations of the fourth aspect, in yet another possible implementation, the following further includes:

[0089] Send fifth indication information, wherein the fifth indication information is used to indicate a second energy proportion, the second energy proportion includes an energy proportion of the space-frequency joint basis projected onto the current downlink channel, and the second energy proportion is used to calculate the fourth space-frequency joint basis matrix.

[0090] In combination with the fourth aspect, or any one of the above-mentioned possible implementations of the fourth aspect, in another possible implementation, the third feedback information also includes a vector matrix, which is a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the third space-frequency joint basis matrix on the diagonal elements.

[0091] It can be understood that allowing the terminal device to determine the fourth space-frequency joint basis matrix according to the second energy proportion newly indicated by the network device can better meet the needs of the network device, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0092] In combination with the fourth aspect, or any of the foregoing possible implementations of the fourth aspect, in yet another possible implementation, the following further includes:

[0093] According to the fourth space-frequency joint basis matrix, a demodulation reference signal DMRS is used to assist in updating a sounding reference signal SRS channel.

[0094] It can be understood that the re-uploaded fourth space-frequency joint basis matrix can meet the latest requirements of network devices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0095] In a fifth aspect, an embodiment of the present application provides a communication device, which may be a terminal device or a device or functional module in a terminal device, wherein:

[0096] The communication device includes a module for executing the method described in the first aspect or any possible implementation manner of the first aspect;

[0097] Alternatively, the communication device includes a processor, and the processor is used to execute the method described in the first aspect or any possible implementation manner of the first aspect.

[0098] Alternatively, the communication device includes a module for executing the method described in the third aspect or any possible implementation manner of the third aspect;

[0099] Alternatively, the communication device includes a processor, and the processor is used to execute the method described in the third aspect or any possible implementation of the third aspect.

[0100] In a sixth aspect, an embodiment of the present application provides a communication device, which may be a network device or a device or functional module in a network device, wherein:

[0101] The communication device includes a module for executing the method described in the second aspect or any possible implementation manner of the second aspect;

[0102] Alternatively, the communication device includes a processor, and the processor is used to execute the method described in the second aspect or any possible implementation manner of the second aspect.

[0103] Alternatively, the communication device includes a module for executing the method described in the fourth aspect or any possible implementation manner of the fourth aspect;

[0104] Alternatively, the communication device includes a processor, and the processor is used to execute the method described in the fourth aspect or any possible implementation of the fourth aspect.

[0105] In a seventh aspect, an embodiment of the present application provides a communication device, characterized in that it includes a logic circuit and an interface, the logic circuit and the interface are coupled; the interface is used to input and / or output information, wherein:

[0106] The logic circuit is configured to execute the method described in the first aspect or any possible implementation of the first aspect, or,

[0107] The logic circuit is configured to execute the method described in the second aspect or any possible implementation of the second aspect, or,

[0108] The logic circuit is configured to execute the method described in the third aspect or any possible implementation of the third aspect, or,

[0109] The logic circuit is used to execute the method described in the fourth aspect or any possible implementation of the fourth aspect.

[0110] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, wherein:

[0111] When the computer program is executed, it can implement the method of the first aspect or any possible implementation manner of the first aspect, or,

[0112] When the computer program is executed, it can implement the method of the second aspect or any possible implementation manner of the second aspect, or,

[0113] When the computer program is executed, it can implement the third aspect or any possible implementation method of the third aspect, or,

[0114] When the computer program is executed, it can implement the method of the fourth aspect or any possible implementation manner of the fourth aspect.

[0115] In a ninth aspect, an embodiment of the present application provides a communication system, the communication system including a network device and a terminal device, wherein:

[0116] The terminal device is configured to execute the method described in the first aspect or any possible implementation of the first aspect or the third aspect or any possible implementation of the third aspect. The network device is configured to execute the method described in the second aspect or any possible implementation of the second aspect or the fourth aspect or any possible implementation of the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0117] The following is an introduction to the drawings used in the embodiments of this application.

[0118] FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0119] FIG2 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0120] FIG3 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0121] FIG4 is a schematic diagram of the internal structure of a communication device provided in an embodiment of the present application;

[0122] FIG5 is a flow chart of a communication method provided in an embodiment of the present application;

[0123] FIG6 is a flow chart of a communication method provided in an embodiment of the present application;

[0124] FIG7 is a flow chart of a communication method provided in an embodiment of the present application;

[0125] FIG8 is a flow chart of a communication method provided in an embodiment of the present application;

[0126] FIG9 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0127] FIG10 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0128] FIG11 is a schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0129] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0130] Please refer to Figure 1, which is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. The communication system 10 includes a transmitting end 101 and a receiving end 102. The receiving end 102 and the transmitting end 101 can be transmitted through a transmission medium such as radio waves. For example, the following communication technologies are used for communication: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), world-wide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) mobile communication system, new radio access technology (NR), sixth generation (6G) mobile communication system or other wireless access technologies. The above communication technologies can be non-standalone (NSA) and / or standalone (SA) networking modes. In addition, the communication system can also be applied to machine type communication (MTC), long term evolution-machine (LTE-M), device-to-device (D2D) network, machine-to-machine (M2M) network, Internet of Things (IoT) network or other networks. Among them, the IoT network can include, for example, the Internet of Vehicles. Among them, the communication methods in the Internet of Vehicles system are collectively referred to as vehicle to other devices (vehicle to X, V2X, X can represent anything). For example, the V2X can include: vehicle to vehicle (V2V) communication, vehicle to infrastructure (V2I) communication, vehicle to pedestrian (V2P) communication or vehicle to network (V2N) communication, etc. The V2X communication system is a sidelink (SL) transmission technology based on D2D communication.

[0131] Please refer to Figure 2, which is a schematic diagram of the structure of a communication system 20 applicable to an embodiment of the present application. This communication system is illustrated using the aforementioned transmitting end 101 as a network device 211 and the receiving end 102 as a terminal device 202 as an example. Specifically, the communication system 20 includes the network device 211 and terminal devices 201, 202, 203, 204, 205, and 206. It should be understood that the communication system 20 may include more network devices or more or fewer terminal devices. The network devices and terminal devices may be hardware, functionally divided software, or a combination of the two. The network devices and terminal devices may communicate with each other through other devices or network elements. In this system, the network device 211 can transmit data with multiple terminal devices. Specifically, the network device 211 can transmit downlink data to terminal devices 201-206. Of course, terminal devices 201-206 can also transmit uplink data to the network device 211. In addition, terminal device 204, terminal device 205, and terminal device 206 may also form a communication system, in which network device 211 may send downlink data to terminal device 201, terminal device 202, and terminal device 205, and then terminal device 205 may send the downlink data to terminal device 204 or terminal device 206. The method in the embodiment of the present application may be applied to the communication system 20 shown in FIG.

[0132] 1) Terminal devices, including devices that provide voice and / or data connectivity to users. Specifically, these devices may provide voice, data, or both. Examples include handheld devices with wireless connectivity or processing devices connected to a wireless modem. These devices may communicate with the core network via a radio access network (RAN), exchanging voice or data with the RAN, or both. The terminal device may include user equipment (UE), wireless terminal device, mobile terminal device, device-to-device communication (D2D) terminal device, vehicle to everything (V2X) terminal device, machine-to-machine / machine-type communications (M2M / MTC) terminal device, Internet of Things (IoT) terminal device, light terminal device (light UE), reduced capability UE (REDCAP UE), subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), access point (AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), or user equipment (user device), etc. For example, it may include a mobile phone (or "cellular" phone), a smart phone, a computer with a mobile terminal device, a portable, pocket-sized, handheld, or computer-built-in mobile device, a laptop computer, a wireless data card, a tablet computer, a wireless modem, etc. For example, a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and other devices.It also includes limited devices, such as devices with low power consumption, limited storage capacity, or limited computing power. Examples include information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning systems (GPS), laser scanners, and so on.

[0133] As an example and not a limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices or smart wearable devices, etc., which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, etc., as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets, smart helmets, and smart jewelry for vital sign monitoring.

[0134] The various terminal devices described above, if located on a vehicle (e.g., placed inside or installed in a vehicle), can be considered vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs). In the embodiments of the present application, the terminal device may also include a relay. Alternatively, any device capable of data communication with a base station can be considered a terminal device.

[0135] In the embodiments of the present application, the device for implementing the function of the terminal device can be a terminal device, or a device capable of supporting the terminal device to implement the function, such as a chip system, which can be installed in the terminal device. In the embodiments 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 technical solutions provided in the embodiments of the present application are described by taking the terminal device as an example in which the device for implementing the function of the terminal is a terminal device.

[0136] 2) Network equipment, including, for example, access network (AN) equipment, such as a base station (e.g., access point), which can refer to a device in an access network that communicates with a wireless terminal device over the air interface through one or more cells, or, for example, a network device in a vehicle-to-everything (V2X) technology is a road side unit (RSU). The base station can be used to convert received air frames to and from IP packets, acting as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network. The RSU can be a fixed infrastructure entity that supports V2X applications and can exchange messages with other entities that support V2X applications. The network equipment can also coordinate attribute management of the air interface. For example, the network device may include a base transceiver station (BTS) in a global system for mobile communication (GSM) or a code division multiple access (CDMA) network, a NB (NodeB) in a wideband code division multiple access (WCDMA), an evolved base station (NodeB or eNB or e-NodeB, evolutionary Node B) in a long term evolution LTE system or an advanced long term evolution (LTE-A), or may also include a next generation node B (gNB) in a 5GNR system (also referred to as an NR system) or a wireless controller, a centralized unit (CU) and a distributed unit (DU) in a cloud radio access network (Cloud RAN) system. In addition, the network device may also be a wearable device, an in-vehicle device, a transmission and reception point (TRP), etc., which is not limited in the embodiments of the present application.

[0137] The network equipment may also include core network equipment, such as access and mobility management function (AMF), user plane function (UPF), session management function (SMF), etc.

[0138] As shown in Figure 3, taking the network device 211 as TRP and the terminal device 202 as UE as an example, a communication system composed of TRP1, TRP2 (the actual number may be more or less) and UE1 to UE5 (the actual number may be more or less) is illustrated, wherein UE1 to UE5 can send uplink data, and the uplink data sent by UE1 to UE5 can be received by one of the TRPs (such as the data sent by UE1, UE2 and UE5 in Figure 3), or can be jointly received by two TRPs (such as the data sent by UE3 and UE4 in Figure 3). At the same time, TRP can send downlink information to UE1 to UE5, such as the number of uplink transmission streams of each UE and the calculation of uplink precoding and indication through downlink information.

[0139] In an embodiment of the present application, the device for implementing the function of the network device may be a network device, or a device that can support the network device to implement the function, such as a chip system, which may be installed in the network device.

[0140] Please refer to Figure 4, which shows a schematic diagram of the internal structure of a communication device (such as a network device, a terminal device). This is just a rough diagram, and it will actually include more other modules or devices. In the structure shown in Figure 4, the network device 211 and the terminal device 202 both include an RRC signaling interaction module, a MAC signaling interaction module and a PHY signaling and data interaction module, wherein the RRC signaling interaction module is a module for sending and receiving RRC signaling; the MAC signaling interaction module is used to send and receive MAC-CE signaling; the PHY signaling and data interaction module is used for the network device to send downlink control signaling or downlink data, and receive uplink signaling or uplink data, and is used for the terminal device to send uplink control signaling or uplink data, and receive downlink control signaling or downlink data.

[0141] Please refer to Figure 5. Figure 5 shows a communication method provided in an embodiment of the present application. It can be implemented based on the architecture shown in Figure 1, Figure 2, or Figure 3, or based on other architectures. The method includes at least an interaction process between two communication devices. For ease of understanding, the following description takes one of the communication devices as a network device and the other as a terminal device as an example. The method includes but is not limited to the following steps:

[0142] Step S501: The network device sends first indication information.

[0143] Specifically, the first indication information is used to indicate a reference energy ratio, which is used to characterize the energy ratio of the space-frequency joint basis projected onto the downlink channel. The reference energy ratio is a reference value or recommended value provided by the network device, that is, from the perspective of the network device, it is expected that the reference energy ratio requirements will be met between the space-frequency joint basis of the terminal device and the downlink channel.

[0144] Optionally, the first indication information may be sent in the form of downlink control information (DCI), or in the form of radio resource control (RRC), or in the form of other types of signaling or data, which is not limited here.

[0145] Step S502: The terminal device receives first indication information.

[0146] Specifically, after receiving the first indication information, the terminal device can parse and obtain the reference energy ratio.

[0147] Optionally, the reference energy percentage may also be specified in the protocol, without the need for the network device to indicate it to the terminal device.

[0148] Step S503: The terminal device determines a second space-frequency joint basis matrix that needs to be reported according to the energy proportion and the current downlink channel.

[0149] In the embodiment of the present application, the second space-frequency joint basis matrix includes multiple space-frequency joint basis. The space-frequency joint basis can be a space-frequency joint statistical basis or a space-frequency joint non-statistical basis, which is described below with examples.

[0150] For example, the space-frequency joint basis can be a space-frequency joint non-statistical basis. The terminal device can pull the number of downlink pilot reference signal (CSI-RS) ports and the number of resource blocks (RB) of the reporting frequency band into one dimension to obtain the corresponding downlink channel H column vector. The calculation of the space-frequency joint basis is through the covariance matrix R = HH of the downlink channel H The space-frequency joint non-statistical basis matrix is ​​obtained by the eigendecomposition process. The space-frequency joint non-statistical basis matrix includes multiple space-frequency joint non-statistical bases, such as space-frequency joint non-statistical bases U1, U2, ..., U N, where N is a positive integer. For the convenience of subsequent description, the space-frequency joint non-statistical basis matrix obtained at this stage can be called the initial space-frequency joint basis matrix.

[0151] For example, the space-frequency joint basis can be a space-frequency joint statistical basis, and the terminal device calculates the channel space-frequency statistical covariance matrix in, The space-frequency statistical covariance matrix of the channel obtained by historical downlink CSI-RS measurement, α is the weighting coefficient, which is used to characterize whether the calculated space-frequency statistical covariance matrix is ​​more affected by the historical covariance matrix or the real-time covariance matrix. Perform eigendecomposition to obtain a space-frequency joint statistical basis matrix, which includes multiple space-frequency joint statistical bases, such as space-frequency joint statistical bases U1, U2, ..., U N , where N is a positive integer. For the convenience of subsequent description, the space-frequency joint statistical basis matrix obtained at this stage can be called the initial space-frequency joint statistical basis matrix.

[0152] The initial space-frequency joint basis matrix obtained in the above way is the global space-frequency joint basis. Next, we need to select the first P space-frequency joint basis U1, U2, ..., U with the largest eigenvalue from the global space-frequency joint basis according to the reference energy ratio. P , for example, these P space-frequency joint bases U1,U2,…,U P The sum of the squares of the moduli of the elements of the downlink channel divided by the sum of the squares of the moduli of the elements of the downlink channel is greater than the reference energy ratio, that is, the size of the reference energy ratio will affect the size of P, and P is an integer greater than 0 and less than N. In the embodiment of the present application, the largest first P space-frequency joint basis U1, U2, ..., U P The matrix formed is the second space-frequency joint basis matrix mentioned above.

[0153] Optionally, the terminal device may further calculate a second vector matrix, wherein the second vector matrix is ​​the space-frequency joint basis U1, U2, ..., U in the second space-frequency joint basis matrix. P The eigenvectors Σ1, Σ2…, Σ are obtained by combining the corresponding eigenvalues ​​on the diagonal elements. p A vector matrix composed of .

[0154] Optionally, the terminal device may also record the space-frequency joint basis U1, U2, ..., U in the second space-frequency joint basis matrix. P The number can be referred to as the second number for the convenience of description, and it can be understood that the second number is P.

[0155] Optionally, in a time division duplex (TDD) system, when uplink and downlink channels are reciprocal, the aforementioned “downlink” channel may also be obtained from the measured uplink channel, that is, the space-frequency joint basis matrix may be obtained based on the uplink channel.

[0156] Step S504: The terminal device sends ninth feedback information.

[0157] Specifically, the ninth feedback information includes the second joint space-frequency basis matrix.

[0158] Optionally, the ninth feedback information may also include the above-mentioned first vector matrix and / or second quantity.

[0159] Step S505: The network device receives ninth feedback information.

[0160] Specifically, after receiving the ninth feedback information, the network device can parse and obtain the second joint space-frequency basis matrix.

[0161] Optionally, if the ninth feedback information includes the second quantity, the second quantity P can also be parsed from the ninth feedback information. Of course, if the ninth feedback information does not carry the second quantity, but the network device needs to use the parameter of the second quantity, the second quantity can also be determined directly based on the number of space-frequency joint bases contained in the second space-frequency joint basis matrix obtained by parsing.

[0162] Optionally, if the ninth feedback information includes a second vector matrix, the second vector matrix can be parsed from the ninth feedback information. Alternatively, if the ninth feedback information does not carry the second quantity, but the network device requires the second quantity parameter, the second quantity can be directly determined based on the number of eigenvectors included in the parsed second vector matrix.

[0163] Step S506: The network device uses the demodulation reference signal DMRS to assist in updating the sounding reference signal SRS channel according to the second joint space-frequency basis matrix.

[0164] Optionally, DMRS may be used to assist in updating the SRS channel based on the second joint space-frequency basis matrix and the second vector matrix. During the DMRS-assisted updating of the SRS channel, a corresponding algorithm may be used. The second joint space-frequency basis matrix and / or the second vector matrix may be used as part of the input parameters of the algorithm. The algorithm may also be predefined, and its specific form and content are not limited herein.

[0165] Optionally, the second joint space-frequency basis matrix and / or the second vector matrix can be used for other operations, such as channel measurement, channel estimation, etc.

[0166] Step S507: The terminal device determines a first space-frequency joint basis matrix that needs to be reported according to the energy proportion and the current downlink channel.

[0167] In one possible implementation, since the sum of the squares of the moduli of the space-frequency joint basis divided by the sum of the squares of the moduli of the elements of the downlink channel is greater than the above-mentioned reference energy ratio, and the execution time of step S507 is delayed relative to step S503, the downlink channel in step S507 is different from the downlink channel in step S503 due to the influence of time. Therefore, in order to keep the sum of the squares of the moduli of the space-frequency joint basis divided by the sum of the squares of the moduli of the elements of the downlink channel still greater than the above-mentioned reference energy ratio, the required space-frequency joint basis must also change accordingly. Specifically, the initial space-frequency joint basis matrix determined in step S503 can be used, and the first S space-frequency joint basis U1, U2, ..., U with the largest corresponding eigenvalues ​​can be selected from the initial space-frequency joint basis matrix. S , so that these S space-frequency joint bases U1, U2, ..., U S The sum of the squares of the moduli of the elements of the current downlink channel (different from that in step S503) is greater than the reference energy ratio. In this embodiment of the present application, the largest first S space-frequency joint basis U1, U2, ..., U S The matrix formed is the first space-frequency joint basis matrix mentioned above.

[0168] In another possible implementation, the initial space-frequency joint basis matrix calculated in step S503 may not be used. Instead, eigendecomposition may be performed again based on the current downlink channel (different from the downlink channel in step S503) to obtain a new initial space-frequency joint basis matrix. The specific principle can be referred to step S503 and will not be described in detail here. Then, the first S space-frequency joint basis U1, U2, ..., U with the largest corresponding eigenvalues ​​are selected from the new initial space-frequency joint basis matrix. S , so that these S space-frequency joint bases U1, U2, ..., U S The sum of the squares of the moduli of the elements of the current downlink channel (different from that in step S503) is greater than the reference energy ratio. In this embodiment of the present application, the largest first S space-frequency joint basis U1, U2, ..., U S The matrix formed is the first space-frequency joint basis matrix mentioned above.

[0169] Optionally, the terminal device may further calculate a first vector matrix, wherein the first vector matrix is ​​the space-frequency joint basis U1, U2, ..., U in the first space-frequency joint basis matrix. S The eigenvectors Σ1, Σ2…, Σ are obtained by combining the corresponding eigenvalues ​​on the diagonal elements. S A vector matrix composed of .

[0170] Optionally, the terminal device may further record the space-frequency joint basis U1, U2, ..., U in the first space-frequency joint basis matrix. S The number can be referred to as the first number for the convenience of description, and it can be understood that the first number is S.

[0171] Step S508: The terminal device sends second feedback information.

[0172] The second feedback information is used to indicate the number of space-frequency joint basis in the first basis difference matrix, and the first basis difference matrix includes the difference between the first space-frequency joint basis matrix and the reported second space-frequency joint basis matrix. For example, the first space-frequency joint basis matrix includes S space-frequency joint basis U1, U2, ..., U S The second space-frequency joint basis matrix includes S space-frequency joint basis U1, U2, ..., U P , then the difference between the two includes U P+1 ,U P+2 ,…,U S , so the first basis difference matrix includes the space-frequency joint basis U P+1 ,U P+2 ,…,U S .

[0173] Accordingly, the first basis difference matrix includes the space-frequency joint basis U P+1 ,U P+2 ,…,U S The number of space-frequency joint bases is (SP).

[0174] Step S509: The network device receives the second feedback information.

[0175] After receiving the second feedback information, the network device can analyze and obtain the number of space-frequency joint basis (SP) in the first basis difference matrix.

[0176] Step S510: The network device sends third indication information.

[0177] The third indication information is used to indicate the first time-frequency resource, and the first time-frequency resource is used to carry the first basis difference matrix.

[0178] In an optional implementation, the size of the first time-frequency resource can be determined based on the number of space-frequency joint bases in the first basis difference matrix obtained previously. For example, the larger the number, the larger the first time-frequency resource; the smaller the number, the smaller the first time-frequency resource.

[0179] In another optional implementation, the size of the first time-frequency resource is specified by a protocol, or is determined by the network device based on other parameters. For example, if a terminal device directly requests a time-frequency resource of a certain size, then upon receiving the terminal device's request, the network device uses the terminal device's request as one of the bases for determining the first time-frequency resource. Of course, other determination methods are also possible and are not limited here.

[0180] For example, the first time-frequency resource may be a physical uplink control channel (PUCCH) resource (e.g., one or more), or a physical uplink shared channel (PUSCH) resource (e.g., one or more), or other types of resources. Optionally, the third indication information may be sent in the form of a DCI, in the form of an RRC, or in the form of other types of signaling or data, which is not limited here.

[0181] Step S511: The terminal device receives the third indication information.

[0182] After receiving the third indication information, the terminal device can parse it to determine the first time-frequency resource.

[0183] Optionally, the first indication information may be sent in the form of DCI, in the form of RRC, or in the form of other types of signaling or data, which is not limited here.

[0184] Optionally, the terminal device may also determine the first time-frequency resource by other means, such as pre-specified in the protocol. In this case, there is no need to execute steps S508, S509, S510 and S511.

[0185] Step S512: The terminal device sends first feedback information.

[0186] Wherein, the first feedback information includes a first basis difference matrix. As mentioned above, if the first space-frequency joint basis matrix includes S space-frequency joint basis U1, U2, ..., U S The second space-frequency joint basis matrix includes S space-frequency joint basis U1, U2, ..., U P , then the difference between the two includes U P+1 ,U P+2 ,…,U S , so the first basis difference matrix includes the space-frequency joint basis U P+1 ,U P+2 ,…,U S .

[0187] Therefore, the first basis difference matrix carried by the first feedback information may specifically include the space-frequency joint basis U P+1 ,U P+2 ,…,U S .

[0188] Optionally, the first feedback information may also include a first vector difference matrix, wherein the first vector difference matrix is ​​a matrix composed of the difference parts of the first vector matrix and the second vector matrix, the first vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the first space-frequency joint basis matrix on the diagonal elements, and the second vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the second space-frequency joint basis matrix on the diagonal elements. In essence, the first vector difference matrix is ​​also the space-frequency joint basis U in the first basis difference matrix. P+1 ,U P+2 ,…,U S The vector matrix obtained by combining the corresponding eigenvalues ​​on the diagonal elements.

[0189] Optionally, if the first time-frequency resource is obtained previously, the first feedback information may be sent on the first time-frequency resource.

[0190] In a possible implementation, the terminal device may periodically send the first feedback information. The specific time period for generating and sending the first feedback information may be configured by the network side (eg, a network device) or may be directly predetermined through a protocol.

[0191] In another possible implementation, the terminal device may also generate and send first feedback information when pre-configured reporting conditions are met. For example, the terminal device may generate and send first feedback information when a change in the downlink channel is detected or the amount of change in the downlink channel exceeds a preset threshold. The specific content of the reporting condition can be configured as needed and is not limited here. In addition, the reporting condition can be configured by the network side (such as a network device) or directly pre-defined through a protocol.

[0192] In another optional implementation, the network device may also send a second indication message to the terminal device, where the second indication message is used to indicate that the first feedback information is to be reported. Accordingly, the terminal device receives the second indication message. Based on the indication message, the terminal device may be informed that the first feedback information needs to be reported, and thus perform the operation of reporting the first feedback information. Of course, it may also first perform some pre-processes required before reporting the first feedback information (if necessary), such as the interaction process of the second feedback information and the third indication message.

[0193] Step S513: The network device receives first feedback information.

[0194] Specifically, after receiving the first feedback information, the network device can parse and obtain the first basis difference matrix. Optionally, if the first feedback information includes a first vector difference matrix, the first vector difference matrix can be parsed from the first feedback information.

[0195] In an optional solution, the first feedback information may directly include the first space-frequency joint matrix and / or the first vector matrix. These two items of information may be used to directly assist in updating the performance of the SRS channel using DMRS in the subsequent process.

[0196] Step S514: The network device uses DMRS to assist in updating the SRS channel according to the first basis differential matrix.

[0197] Specifically, the network device can determine the first space-frequency joint matrix based on the first basis difference matrix and the second space-frequency joint matrix obtained previously; if there is a first vector difference matrix in the first feedback information, the first vector matrix can also be determined based on the first vector difference matrix and the second vector matrix obtained previously.

[0198] Afterwards, the network device may use the DMRS to assist in updating the SRS channel according to the first joint space-frequency basis matrix.

[0199] Optionally, DMRS may be used to assist in updating the SRS channel based on the first joint space-frequency basis matrix and the first vector matrix. During the DMRS-assisted updating of the SRS channel, a corresponding algorithm may be used. The first joint space-frequency basis matrix and / or the first vector matrix may be used as part of the input parameters of the algorithm. The algorithm may also be predefined, and its specific form and content are not limited herein.

[0200] Optionally, the first joint space-frequency basis matrix and / or the first vector matrix may be used for other operations, such as channel measurement, channel estimation, etc.

[0201] In the embodiment of the present application, steps S501-S514 are steps within a long period for reporting the space-frequency joint basis matrix and / or vector matrix. Within this long period, steps S503-S506 are a small period for reporting the space-frequency joint basis matrix and / or vector matrix, and steps S507-S514 are another small period for reporting the space-frequency joint basis matrix and / or vector matrix. Of course, other small periods may also exist, which are not listed here. That is, a large reporting period includes multiple small reporting periods, and the reference energy percentage sent within a large reporting period can be used by all small periods within the large period. Optionally, different large periods can respectively indicate the reference energy percentage required for the period, that is, the reference energy percentage used by different large periods may be different. Optionally, within a large period, the initial space-frequency joint basis matrix can be calculated only once, and each small period within the large period can share the same initial space-frequency joint basis matrix. In addition, the period length of the large period and the period length of the small period can be set according to actual needs and are not limited here.

[0202] As shown in FIG6 , it is a flow chart of another communication method provided by an embodiment of the present application. This method is an optional case. The core idea of ​​this method is relatively similar to the core idea of ​​the method shown in FIG5 . The process shown in FIG6 is briefly introduced below. The network device indicates the reference energy ratio. The terminal device determines the number of space-frequency joint bases in the space-frequency joint base matrix to be reported based on the reference energy ratio, referred to as the number of bases, and then reports it to the network device. The terminal device also reports the determined space-frequency joint base matrix to the network device (optionally, the eigenvector matrix can also be reported). Optionally, the time-frequency resources for reporting the space-frequency joint base matrix can be configured by the protocol or indicated by the network device, such as determined based on the reported number of bases. Next, the network device sends a channel state information reference signal (CSI-RS) to the terminal device. Signal, CSI-RS) so that the terminal device can determine the current downlink channel (or the latest downlink channel). When the terminal device determines that the number of space-frequency joint bases is insufficient based on the current downlink channel, the terminal device reports the differential number to the network device. After receiving the differential number, if the network device determines that it needs to continue reporting the space-frequency joint base corresponding to the differential component, it sends a reporting instruction to the terminal device. Correspondingly, the terminal device reports the space-frequency joint base corresponding to the differential component. After that, the network device uses DMRS to assist in updating the SRS channel based on the space-frequency joint base corresponding to the differential component (the detailed principle can be referred to the previous description). Optionally, there can be a difference between a large cycle and a small cycle. For example, FIG6 schematically shows two large cycles 602 and 603, and the large cycle 602 includes a small cycle 6021. Although only one small cycle 6021 is shown here, there can actually be more similar small cycles. Each small cycle includes reporting the differential component, the space-frequency joint base corresponding to the differential component, and the process of using DMRS to assist in updating the SRS channel according to the space-frequency joint base corresponding to the differential component. In addition, each macrocycle contains a pre-process, such as pre-process 6022 in macrocycle 602 and pre-process 6031 in macrocycle 603. The energy percentages indicated by the network device to the terminal device in different macrocycles are generally different, but the principles of the processes executed in different macrocycles are the same.

[0203] In the method shown in Figure 5, the network device sends a reference energy ratio to the terminal device, and the terminal device determines the space-frequency joint basis required by the network device based on the current latest downlink channel situation and the reference energy ratio, instead of using a fixed number of space-frequency joint basis. Therefore, the obtained number of space-frequency joint basis is more accurate. Therefore, when the network device subsequently uses DMRS to assist in updating the SRS channel based on the more accurate number of space-frequency joint basis, the performance of channel extrapolation will not decrease, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0204] Please refer to Figure 7, which shows a communication method provided in an embodiment of the present application. The method can be implemented based on the architecture shown in Figure 1, Figure 2, or Figure 3, or based on other architectures. The method includes at least an interaction process between two communication devices. For ease of understanding, the following description is based on an example in which one of the communication devices is a network device and the other is a terminal device. The method includes but is not limited to the following steps:

[0205] Step S701: The terminal device sends third feedback information.

[0206] The third feedback information includes a third space-frequency joint basis matrix, which includes multiple space-frequency joint basis matrices. The space-frequency joint basis matrix is ​​used by the network device to assist in updating the SRS channel using DMRS.

[0207] The space-frequency joint basis in the embodiment of the present application may be a space-frequency joint statistical basis or a space-frequency joint non-statistical basis.

[0208] For example, the space-frequency joint basis can be a space-frequency joint non-statistical basis. The terminal device can pull the number of downlink pilot reference signal (CSI-RS) ports and the number of resource blocks (RB) of the reporting frequency band into one dimension to obtain the corresponding downlink channel H column vector. The calculation of the space-frequency joint basis is through the covariance matrix R = HH of the downlink channel H The space-frequency joint non-statistical basis matrix is ​​obtained by the eigendecomposition process. The space-frequency joint non-statistical basis matrix includes multiple space-frequency joint non-statistical bases, such as space-frequency joint non-statistical bases U1, U2, ..., U N , where N is a positive integer. For the convenience of subsequent description, the space-frequency joint non-statistical basis matrix obtained at this stage can be called the initial space-frequency joint basis matrix.

[0209] For example, the space-frequency joint basis can be a space-frequency joint statistical basis, and the terminal device calculates the channel space-frequency statistical covariance matrix in, The space-frequency statistical covariance matrix of the channel obtained by historical downlink CSI-RS measurement, α is the weighting coefficient, which is used to characterize whether the calculated space-frequency statistical covariance matrix is ​​more affected by the historical covariance matrix or the real-time covariance matrix. Perform eigendecomposition to obtain a space-frequency joint statistical basis matrix, which includes multiple space-frequency joint statistical bases, such as space-frequency joint statistical bases U1, U2, ..., UN , where N is a positive integer. For the convenience of subsequent description, the space-frequency joint statistical basis matrix obtained at this stage can be called the initial space-frequency joint statistical basis matrix.

[0210] The initial space-frequency joint basis matrix obtained in the above manner is a global space-frequency joint basis. The third space-frequency joint basis matrix can be a part of the initial space-frequency joint basis matrix here. For example, the network device indicates to the terminal device that Y space-frequency joint basis is required, then U1, U2, ..., U N The matrix composed of the largest Y space-frequency joint basis in is the third space-frequency joint basis matrix; for example, the network device indicates an energy ratio to the terminal device, which is used to represent the energy ratio of the space-frequency joint basis projected onto the current downlink channel. Then the terminal device derives U1, U2, ..., U according to the energy ratio and the current downlink channel. N The matrix composed of the P largest space-frequency joint bases in the derivation is the third space-frequency joint basis matrix. It should be noted that the principle of deriving the largest P space-frequency joint bases has been explained before and will not be repeated here. Of course, the third space-frequency joint basis matrix can also be determined by other methods, and the specific methods are not limited here.

[0211] Optionally, a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the third space-frequency joint basis matrix on the diagonal elements can also be determined. For ease of description, it can be called the third vector matrix. The above-mentioned third feedback information can also include the third vector matrix.

[0212] Step S702: The network device receives third feedback information.

[0213] After receiving the third feedback information, the network device can parse out the third joint space-frequency basis matrix. If the third feedback information includes a third vector matrix, the network device can also parse out the third vector matrix.

[0214] Step S703: The network device uses DMRS to assist in updating the SRS channel based on the third joint space-frequency basis matrix. During the DMRS-assisted SRS channel update, a corresponding algorithm is used. The third joint space-frequency basis matrix and / or the third vector matrix may be used as part of the input parameters of the algorithm. The algorithm may also be predefined, and its specific form and content are not limited herein.

[0215] Optionally, the SRS channel may be updated with the assistance of DMRS according to the third joint space-frequency basis matrix and the third vector matrix.

[0216] Optionally, the third joint space-frequency basis matrix and / or the third vector matrix can be used for other operations, such as channel measurement, channel estimation, etc.

[0217] Step S704: The terminal device sends fourth feedback information.

[0218] Among them, the fourth feedback information is used to indicate the first energy proportion, which includes the energy proportion of the space-frequency joint basis projected onto the current downlink channel. For example, the energy proportion of multiple space-frequency joint bases in the previous third space-frequency joint basis matrix projected onto the current downlink channel. This can be a real-time energy proportion, and the size of the energy proportion changes with the current downlink channel.

[0219] There are many ways to indicate the first energy proportion. For example, directly indicating the value of the first energy proportion, such as 65%. In this case, the fourth feedback information needs to include the parameter of the first energy proportion 65%; for another example, indicating the index corresponding to the first energy proportion. As shown in Table 1, energy proportions of different sizes correspond to their respective indexes. In this case, the fourth feedback information needs to include the index corresponding to the first energy proportion. If the first energy proportion is 65%, then the corresponding index is 3, so the fourth feedback information includes the index value "3".

[0220] Table 1

[0221] Step S705: The network device receives fourth feedback information.

[0222] After receiving the fourth feedback information, the network device can parse the first energy percentage. For example, if the fourth feedback information carries the first energy percentage, the network device can directly parse the first energy percentage, such as 65%. For another example, if the fourth feedback information carries an energy percentage index value, such as "3", the network device can query Table 1 and find that the energy percentage corresponding to index "3" is 65%. Therefore, it can be determined that the first energy percentage reported by the terminal device is 65%. It can be understood that the network device is configured with the same Table 1 as the terminal device.

[0223] It should be noted that whether the fourth feedback information directly carries the energy percentage or carries the index corresponding to the energy percentage can be agreed upon in advance by the network device and the terminal device. The agreement can be reached directly through the method specified in the protocol, or the network device can send an instruction to the terminal device to reach the agreement. The specific details are not limited here. In addition, when the indication is in the form of an index, the index table (such as Table 1) can be pre-specified in the protocol or sent by the network device to the terminal device. The specific details are not limited here.

[0224] Step S706: The network device determines that the first energy proportion is less than a preset energy proportion threshold.

[0225] Specifically, the preset energy percentage threshold is a preconfigured energy percentage used for reference comparison. Generally speaking, when the joint space-frequency basis and the downlink channel meet the preset energy percentage threshold, the performance of using DMRS to assist in updating the SRS channel is generally better. The preset energy percentage threshold can be set based on historical experience or generated by a corresponding algorithm, and is not limited here.

[0226] Generally speaking, if the first energy ratio is less than the preset energy ratio threshold, the performance of the network device using DMRS to assist in updating the SRS channel is not very good, and the energy ratio needs to be updated. Since the energy ratio is the energy ratio projected onto the downlink channel by the space-frequency joint basis, adjusting the space-frequency joint basis can optimize the energy ratio, so the network device executes the subsequent step S707.

[0227] Step S707: The network device sends fourth indication information.

[0228] The fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix.

[0229] Optionally, the fourth indication information can be sent in the form of DCI, or in the form of RRC, or in the form of other types of signaling or data, which is not limited here.

[0230] Step S708: The terminal device receives the fourth indication information.

[0231] After receiving the fourth indication information, the terminal device analyzes it and determines that the space-frequency joint basis matrix needs to be re-reported.

[0232] Step S709: The network device sends fifth indication information.

[0233] The fifth indication information is used to indicate a second energy proportion, where the second energy proportion includes the energy proportion of the space-frequency joint basis projected onto the current downlink channel. Optionally, the second energy proportion is an energy proportion required (or desired) by the network device. When this energy proportion is met, the network device performs better by using DMRS to assist in updating the SRS channel. The second energy proportion can be a preset energy proportion threshold or a value different from the preset energy proportion threshold, depending on actual needs.

[0234] The fifth indication information may carry a specific value of the second energy ratio, or may carry an index corresponding to the second energy ratio, thereby indicating the second energy ratio. Of course, it may also be indicated in other ways, which are not limited here.

[0235] Step S710: The terminal device receives the fifth indication information.

[0236] After receiving the fifth indication information, the terminal device can determine the second energy ratio by analyzing it.

[0237] It should be noted that, in addition to being configured by the network side (such as network equipment), the second energy ratio can also be pre-specified in the protocol, and the embodiment of the present application does not make any specific limitation.

[0238] Optionally, the fifth indication information can be sent in the form of DCI, or in the form of RRC, or in the form of other types of signaling or data, which is not limited here.

[0239] Step S711: The terminal device determines the fourth space-frequency joint basis matrix according to the second energy proportion.

[0240] Referring to the principle in step 701, the global space-frequency joint basis U1, U2, ..., U can be obtained based on the current downlink channel (which may be updated compared to the downlink channel in step S701). E , where E is a positive integer, and then the first F space-frequency joint basis U1, U2, ..., U with the largest corresponding eigenvalue is selected from the global space-frequency joint basis according to the second energy proportion. F , for example, these F space-frequency joint bases U1,U2,…,U F The sum of the squares of the moduli of the elements of the downlink channel divided by the sum of the squares of the moduli of the elements of the downlink channel is greater than the second energy proportion, and F is an integer greater than 0 and less than E.

[0241] The largest first F space-frequency joint basis U1, U2, ..., U F It can be regarded as a space-frequency joint basis matrix, that is, the fourth space-frequency joint basis matrix. Furthermore, the fourth space-frequency joint basis matrix, that is, the largest first F space-frequency joint basis U1, U2, ..., U F The corresponding eigenvalues ​​Σ1, Σ2…, Σ F Combining on the diagonal elements gives the fourth vector matrix.

[0242] Step S712: The terminal device sends fifth feedback information.

[0243] The fifth feedback information includes the fourth space-frequency joint basis matrix. Optionally, the fifth feedback information also includes the fourth vector matrix.

[0244] Step S713: The network device receives the fifth feedback information.

[0245] The network device may parse the fifth feedback information to obtain the fourth joint space-frequency basis matrix. If the fifth feedback information includes a fourth vector matrix, the network device may further parse the fourth vector matrix.

[0246] Optionally, the terminal device may not send the fifth feedback information, but may send the sixth feedback information. Accordingly, the network device receives the sixth feedback information, wherein the sixth feedback information includes a differential matrix, and the differential matrix includes the difference between the space-frequency joint basis in the fourth space-frequency joint basis matrix and the space-frequency joint basis in the third space-frequency joint basis matrix. Afterwards, the network device can determine the above-mentioned fourth space-frequency joint basis matrix based on the differential matrix and the third space-frequency joint basis matrix obtained previously. Optionally, the sixth feedback information may also include the eigenvalues ​​corresponding to the space-frequency joint basis in the differential matrix, which are combined on the diagonal elements to obtain a second vector difference matrix. In this case, the network device can parse the sixth vector difference matrix from the sixth feedback information; and then determine the fourth vector matrix based on the sixth vector difference matrix and the previous third vector matrix.

[0247] Step S714: The network device uses the demodulation reference signal DMRS to assist in updating the sounding reference signal SRS channel according to the fourth space-frequency joint basis matrix.

[0248] Optionally, DMRS may be used to assist in updating the SRS channel based on the fourth joint space-frequency basis matrix and the fourth vector matrix. During the DMRS-assisted updating of the SRS channel, a corresponding algorithm may be used. The fourth joint space-frequency basis matrix and / or the fourth vector matrix may be used as part of the input parameters of the algorithm. The algorithm may also be predefined, and its specific form and content are not limited herein.

[0249] Optionally, the fourth joint space-frequency basis matrix and / or the fourth vector matrix may be used for other operations, such as channel measurement, channel estimation, etc.

[0250] As shown in FIG8 , it is a flow chart of another communication method provided in an embodiment of the present application. This method is an optional case. The core idea of ​​this method is similar to the core idea of ​​the method shown in FIG7 . The process shown in FIG8 is briefly introduced below. The terminal device reports the space-frequency joint basis matrix to the network device (optionally, the eigenvector matrix can also be reported), and the network device sends a channel state information reference signal (CSI-RS) to the terminal device. The terminal device uses a CSI-RS to determine the current downlink channel (or the latest downlink channel) so that the terminal device can determine the current downlink channel (or the latest downlink channel). The terminal device recalculates the energy ratio according to the downlink channel and reports the energy ratio. The process of calculating and reporting the energy ratio can be performed periodically. After each energy ratio is reported, the network device can determine whether the reported energy ratio meets its own needs. If it does not meet the needs, it sends an indication message to the terminal device to instruct it to re-report the space-frequency joint basis matrix. After receiving the indication message, the terminal device re-reports the space-frequency joint basis matrix (optionally, it can also report the eigenvector matrix). Correspondingly, after the network device receives the new space-frequency joint basis matrix (optionally, it can also report the eigenvector matrix), it can use DMRS to assist in updating the SRS channel according to the information (the detailed principle can be referred to the previous description).

[0251] In the method shown in Figure 7, when the terminal device reports the space-frequency joint basis matrix to the network device, it also reports the first energy ratio determined based on the current space-frequency joint basis matrix and the current channel, so that the network device can determine whether the current first energy ratio meets the requirements, thereby facilitating the decision on how to make subsequent adjustments so that the network device can obtain an appropriate number of space-frequency joint basis matrices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0252] The following describes a communication device according to an embodiment of the present application.

[0253] The present application divides the communication device into functional modules according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in this application is schematic and is only a logical functional division. In actual implementation, there may be other division methods.

[0254] The communication device according to the embodiment of the present application will be described in detail below with reference to FIG. 9 to FIG. 11 .

[0255] Figure 9 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. As shown in Figure 9, the communication device includes a processing module 901 and a transceiver module 902. The transceiver module 902 can implement corresponding communication functions, and the processing module 901 is used to process data. For example, the transceiver module 902 can also be referred to as an interface, a communication interface, or a communication module.

[0256] In some embodiments of the present application, the communication device can be used to perform the actions performed by the transmitting end in the above method embodiments. For example, the transmitting end can be the device itself or a chip or functional module that can be configured in the device. The transceiver module 902 is used to perform the operations related to the transmitting end and receiving in the above method embodiments, and the processing module 901 is used to perform the operations related to the processing of the transmitting end in the above method embodiments. The processing module 901 can perform the corresponding operations by calling a computer program or by performing the corresponding operations through the corresponding hardware circuit. The transceiver module 902 can perform the transceiver operations independently or under the control of the processing module 901.

[0257] Case 1, illustratively, the communication device shown in FIG9 may be the terminal device shown in FIG5 or a component in the terminal device. The processing module 901 and the transceiver module 902 in the communication device may respectively perform the following operations:

[0258] The processing module 901 is configured to obtain first indication information, where the first indication information is used to indicate a reference energy ratio projected onto a downlink channel by a joint space-frequency basis;

[0259] The processing module 901 is configured to determine a first space-frequency joint basis matrix to be reported according to the energy proportion and the current downlink channel;

[0260] The transceiver module 902 is used to send first feedback information, wherein the first feedback information includes the first space-frequency joint basis or the first basis difference matrix, and the first basis difference matrix includes the difference between the first space-frequency joint basis matrix and the reported second space-frequency joint basis matrix.

[0261] In the above method, the network device sends a reference energy ratio to the terminal device, and the terminal device determines the space-frequency joint basis required by the network device based on the latest downlink channel conditions and the reference energy ratio, instead of using a fixed number of space-frequency joint basis. Therefore, the number of space-frequency joint basis obtained is more accurate. Therefore, when the network device subsequently updates the SRS channel with DMRS assistance based on a more accurate number of space-frequency joint basis, the performance of channel extrapolation will not decrease, thereby improving the performance of updating the SRS channel with DMRS assistance. Optionally, when reporting the space-frequency joint basis matrix, the difference compared to the history, that is, the first differential basis matrix, can also be reported, instead of reporting the complete space-frequency joint basis matrix, which reduces the time-frequency resources occupied during reporting and improves reporting efficiency.

[0262] In one possible implementation, the first feedback information also includes a first vector difference matrix, which is a matrix composed of the difference parts of the first vector matrix and the second vector matrix. The first vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the first space-frequency joint basis matrix on the diagonal elements, and the second vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the second space-frequency joint basis matrix on the diagonal elements.

[0263] In this implementation, in addition to reporting the differential part of the space-frequency joint basis matrix, the differential component of the eigenvector matrix, that is, the first vector differential matrix, can also be uploaded, which further reduces the time-frequency resources occupied during reporting and improves reporting efficiency.

[0264] In yet another possible implementation, in terms of determining the first space-frequency joint basis matrix to be reported according to the energy proportion and the current downlink channel, the processing module 901 is specifically configured to:

[0265] A first space-frequency joint basis matrix is ​​selected from the initial space-frequency joint basis matrix according to the energy proportion, wherein the reported second space-frequency joint basis matrix is ​​also selected from the initial space-frequency joint basis matrix, and the initial space-frequency joint basis matrix is ​​obtained by eigendecomposing the space-frequency statistical covariance matrix of the downlink channel.

[0266] In this implementation, there is no need to re-perform eigendecomposition on the downlink channel to determine the first space-frequency joint basis matrix. Instead, the previously generated initial space-frequency joint basis matrix is ​​used and the first space-frequency joint basis matrix is ​​directly selected from the initial space-frequency joint basis matrix. Since the downlink channel is not re-decomposed, computational overhead is saved and the efficiency of determining the first space-frequency joint basis matrix is ​​improved.

[0267] In another possible implementation:

[0268] The transceiver module 902 is further configured to receive second indication information, where the second indication information is configured to instruct reporting of the first feedback information.

[0269] It can be understood that the first feedback information is reported only when the second indication information sent by the network device is received, thereby avoiding invalid reporting and saving communication overhead and computing overhead of both the network device and the terminal device.

[0270] In yet another possible implementation, the method further includes:

[0271] The transceiver module 902 is further used to receive third indication information, where the third indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to carry the first basis difference matrix.

[0272] In another possible implementation:

[0273] The transceiver module 902 is further configured to send second feedback information, where the second feedback information is used to indicate the number of joint space-frequency basis in the first basis difference matrix.

[0274] In this method, the number of space-frequency joint bases in the first basis difference matrix is ​​indicated to the network device, so that the network device can allocate specific time-frequency resources in a targeted manner according to the number of space-frequency joint bases, avoiding the problem of insufficient or wasted time-frequency resources.

[0275] In another possible implementation, in terms of obtaining the first indication information, the processing module 901 is specifically configured to trigger the transceiver module 902 to receive the first indication information.

[0276] In this implementation, the terminal device may obtain the first indication information by directly receiving it from the network device.

[0277] Case 2, multiplexing Figure 9. In other embodiments of the present application, illustratively, the communication device shown in Figure 9 may be the network device shown in Figure 5 or a component in the network device. The processing module 901 and the transceiver module 902 in the communication device may respectively perform the following operations:

[0278] The transceiver module 902 is configured to send first indication information, where the first indication information is used to indicate a reference energy ratio projected onto a downlink channel by a space-frequency joint basis;

[0279] The transceiver module 902 is used to receive first feedback information, wherein the first feedback information includes a first space-frequency joint basis matrix or a first basis difference matrix, the first basis difference matrix includes the difference between the first space-frequency joint basis matrix and the reported second space-frequency joint basis matrix, and the reference capability ratio is used to determine the first space-frequency joint basis matrix.

[0280] In the above method, the network device sends a reference energy ratio to the terminal device, and the terminal device determines the space-frequency joint basis required by the network device based on the latest downlink channel conditions and the reference energy ratio, instead of using a fixed number of space-frequency joint basis. Therefore, the number of space-frequency joint basis obtained is more accurate. Therefore, when the network device subsequently updates the SRS channel with DMRS assistance based on a more accurate number of space-frequency joint basis, the performance of channel extrapolation will not decrease, thereby improving the performance of updating the SRS channel with DMRS assistance. Optionally, when reporting the space-frequency joint basis matrix, the difference compared to the history, that is, the first differential basis matrix, can also be reported, instead of reporting the complete space-frequency joint basis matrix, which reduces the time-frequency resources occupied during reporting and improves reporting efficiency.

[0281] In another possible implementation, the first feedback information also includes a first vector difference matrix, which is a matrix composed of the difference parts of the first vector matrix and the second vector matrix. The first vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the first space-frequency joint basis matrix on the diagonal elements, and the second vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the second space-frequency joint basis matrix on the diagonal elements.

[0282] In this implementation, in addition to reporting the differential part of the space-frequency joint basis matrix, the differential component of the eigenvector matrix, that is, the first vector differential matrix, can also be uploaded, which further reduces the time-frequency resources occupied during reporting and improves reporting efficiency.

[0283] In another possible implementation:

[0284] The transceiver module 902 is further configured to send second indication information, where the second indication information is used to instruct reporting of the first feedback information.

[0285] It can be understood that the terminal device can report the first feedback information only when instructed to report by the second indication information, thereby avoiding invalid reporting and saving communication overhead and computing overhead of both the network device and the terminal device.

[0286] In another possible implementation:

[0287] The processing module 901 is further configured to determine whether the first feedback information can continue to be reported.

[0288] It can be understood that the subsequent process of reporting the first feedback information is triggered only when it is determined that the information can be reported, thereby saving communication overhead and computing overhead of both the network device and the terminal device.

[0289] In another possible implementation:

[0290] The transceiver module 902 is further used to send third indication information, where the third indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to carry the first basis difference matrix.

[0291] In another possible implementation:

[0292] The transceiver module 902 is further configured to receive second feedback information, where the second feedback information is used to indicate the number of joint space-frequency basis in the first basis difference matrix.

[0293] In this method, the number of space-frequency joint bases in the first basis difference matrix is ​​indicated to the network device, so that the network device can allocate specific time-frequency resources in a targeted manner according to the number of space-frequency joint bases, avoiding the problem of insufficient or wasted time-frequency resources.

[0294] In another possible implementation:

[0295] The processing module 901 is further configured to use a demodulation reference signal DMRS to assist in updating a sounding reference signal SRS channel according to the first basis difference matrix.

[0296] It can be understood that the first space-frequency joint basis matrix can be determined based on the first basis difference matrix and the existing second space-frequency joint basis matrix. Since the first space-frequency joint basis matrix is ​​a relatively accurate space-frequency joint basis matrix, the performance of using DMRS to assist in updating the SRS channel based on the first space-frequency joint basis matrix is ​​better.

[0297] Case 3, multiplexing Figure 9. In other embodiments of the present application, illustratively, the communication device shown in Figure 9 may be the terminal device or a component of the terminal device shown in Figure 7. The processing module 901 and the transceiver module 902 in the communication device may respectively perform the following operations:

[0298] The transceiver module 902 is configured to send third feedback information, wherein the third feedback information includes a third space-frequency joint basis matrix;

[0299] The transceiver module 902 is configured to send fourth feedback information, where the fourth feedback information is used to indicate a first energy proportion, where the first energy proportion includes an energy proportion projected from the joint space-frequency basis onto the current downlink channel.

[0300] In the above method, when the terminal device reports the space-frequency joint basis matrix to the network device, it will also report the first energy ratio determined based on the current space-frequency joint basis matrix and the current channel, so that the network device can determine whether the current first energy ratio meets the requirements, thereby facilitating the decision on how to make subsequent adjustments so that the network device can obtain an appropriate number of space-frequency joint basis matrices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0301] In a possible implementation manner, the fourth feedback information includes a value of the first energy proportion.

[0302] In another possible implementation, the fourth feedback information includes an index corresponding to the first energy proportion.

[0303] It can be understood that indicating in an index manner requires less field overhead, which can save communication resources and improve communication efficiency.

[0304] In another possible implementation:

[0305] The transceiver module 902 is configured to receive fourth indication information, wherein the fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix;

[0306] The transceiver module 902 is configured to send fifth feedback information, where the fifth feedback information includes a fourth joint space-frequency basis matrix.

[0307] It can be understood that re-uploading the space-frequency joint basis matrix can meet the latest requirements of network devices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0308] In another possible implementation:

[0309] The transceiver module 902 is configured to receive fourth indication information, wherein the fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix;

[0310] The transceiver module 902 is configured to send sixth feedback information, wherein the sixth feedback information includes a difference matrix, and the difference matrix includes a difference between a space-frequency joint basis in a fourth space-frequency joint basis matrix and a space-frequency joint basis in the third space-frequency joint basis matrix.

[0311] It can be understood that uploading the differential matrix allows the network device to determine the latest space-frequency joint basis matrix, thereby meeting the latest requirements of the network device and improving the performance of using DMRS to assist in updating the SRS channel.

[0312] In another possible implementation:

[0313] The transceiver module 902 is configured to receive fifth indication information, where the fifth indication information is used to indicate a second energy proportion, where the second energy proportion includes an energy proportion projected onto a current downlink channel by a joint space-frequency basis;

[0314] The processing module 901 is configured to determine the fourth joint space-frequency basis according to the second energy proportion.

[0315] It can be understood that the fourth space-frequency joint basis matrix determined according to the second energy proportion newly indicated by the network device can better meet the needs of the network device, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0316] In another possible implementation, the third feedback information further includes a third vector matrix, where the third vector matrix is ​​a vector matrix obtained by combining eigenvalues ​​corresponding to the space-frequency joint basis in the third space-frequency joint basis matrix on diagonal elements.

[0317] In yet another possible implementation, in terms of sending the fourth feedback information, the transceiver module 902 is specifically configured to: periodically send the fourth feedback information.

[0318] It can be understood that periodically sending the fourth feedback information can enable the network device to promptly determine whether the current energy ratio meets the requirements, and thus determine whether the reported space-frequency joint basis matrix needs to be adjusted depending on the situation, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0319] Case 4, multiplexing Figure 9. In other embodiments of the present application, illustratively, the communication device shown in Figure 9 may be the network device shown in Figure 7 or a component in the network device. The processing module 901 and the transceiver module 902 in the communication device may respectively perform the following operations:

[0320] The transceiver module 902 is configured to receive third feedback information, wherein the third feedback information includes a third space-frequency joint basis matrix;

[0321] The transceiver module 902 is configured to receive fourth feedback information, where the fourth feedback information is used to indicate a first energy proportion, where the first energy proportion includes an energy proportion projected from the joint space-frequency basis onto the current downlink channel.

[0322] In the above method, when the terminal device reports the space-frequency joint basis matrix to the network device, it will also report the first energy ratio determined based on the current space-frequency joint basis matrix and the current channel, so that the network device can determine whether the current first energy ratio meets the requirements, thereby facilitating the decision on how to make subsequent adjustments so that the network device can obtain an appropriate number of space-frequency joint basis matrices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0323] In a possible implementation manner, the fourth feedback information includes a value of the first energy proportion.

[0324] In another possible implementation, the fourth feedback information includes an index corresponding to the first energy proportion.

[0325] It can be understood that indicating in an index manner requires less field overhead, which can save communication resources and improve communication efficiency.

[0326] In another possible implementation:

[0327] The transceiver module 902 is further configured to send fourth indication information, wherein the fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix;

[0328] The transceiver module 902 is further configured to receive fifth feedback information, where the fifth feedback information includes a fourth joint space-frequency basis matrix.

[0329] It can be understood that re-uploading the space-frequency joint basis matrix can meet the latest requirements of network devices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0330] In another possible implementation:

[0331] The transceiver module 902 is further configured to send fourth indication information, wherein the fourth indication information is used to instruct re-reporting of the space-frequency joint basis matrix;

[0332] The transceiver module 902 is further configured to receive sixth feedback information, wherein the sixth feedback information includes a differential matrix, and the differential matrix includes a difference between a space-frequency joint basis in the fourth space-frequency joint basis matrix and a space-frequency joint basis in the third space-frequency joint basis matrix.

[0333] It can be understood that uploading the differential matrix allows the network device to determine the latest space-frequency joint basis matrix, thereby meeting the latest requirements of the network device and improving the performance of using DMRS to assist in updating the SRS channel.

[0334] In another possible implementation:

[0335] The processing module 901 is configured to determine whether the first energy proportion is less than a preset energy proportion threshold.

[0336] It can be understood that the network device will trigger the operation of sending the fourth indication information only when it determines that the first energy proportion is less than the preset energy proportion threshold, avoiding the problem of waste of communication overhead and computing overhead caused by frequent or untimely sending.

[0337] In another possible implementation:

[0338] The transceiver module 902 is also used to send fifth indication information, wherein the fifth indication information is used to indicate a second energy proportion, the second energy proportion includes the energy proportion of the space-frequency joint basis projected onto the current downlink channel, and the second energy proportion is used to calculate the fourth space-frequency joint basis matrix.

[0339] In yet another possible implementation, the third feedback information further includes a vector matrix, where the vector matrix is ​​a vector matrix obtained by combining eigenvalues ​​corresponding to the space-frequency joint basis in the third space-frequency joint basis matrix on diagonal elements.

[0340] It can be understood that allowing the terminal device to determine the fourth space-frequency joint basis matrix according to the second energy proportion newly indicated by the network device can better meet the needs of the network device, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0341] In another possible implementation:

[0342] The processing module 901 is further configured to use a demodulation reference signal DMRS to assist in updating a sounding reference signal SRS channel according to the fourth space-frequency joint basis matrix.

[0343] It can be understood that the re-uploaded fourth space-frequency joint basis matrix can meet the latest requirements of network devices, thereby improving the performance of using DMRS to assist in updating the SRS channel.

[0344] The specific descriptions of the transceiver module and the processing module shown in the above embodiments are only examples. For the specific functions or execution steps of the transceiver module and the processing module, please refer to the above method embodiments and will not be described in detail here.

[0345] The communication device of the embodiment of the present application is described above. The following describes possible product forms of the communication device. Any product having the functions of the communication device described in FIG9 falls within the scope of protection of the embodiment of the present application.

[0346] The following description is for illustrative purposes only and does not limit the product form of the communication device of the embodiment of the present application to this description.

[0347] In one possible implementation, in the communication device shown in FIG9 , the processing module 901 may be one or more processors, and the transceiver module 902 may be a transceiver. Alternatively, the transceiver module 902 may be a transmitting module and a receiving module, where the transmitting module may be a transmitter and the receiving module may be a receiver, with the transmitting module and receiving module being integrated into a single device, such as a transceiver. In embodiments of the present application, the processor and transceiver may be coupled, and the connection method between the processor and transceiver is not limited in this embodiment. During the execution of the above-described method, the process of sending information in the above-described method may be the process of the processor outputting the above-described information. When outputting the above-described information, the processor outputs the above-described information to the transceiver for transmission by the transceiver. After being output by the processor, the above-described information may require further processing before reaching the transceiver. Similarly, the process of receiving information in the above-described method may be the process of the processor receiving the above-described information. When the processor receives the input information, the transceiver receives the above-described information and inputs it into the processor. Furthermore, after the transceiver receives the above-described information, the above-described information may require further processing before being input into the processor.

[0348] As shown in Figure 10, the communication device 100 includes one or more processors 1011 and a transceiver 1010. For example, the transceiver 1010 is configured to execute the functions or steps implemented by the transceiver module 902 shown in Figure 9, and the processor 1011 is configured to execute the functions or steps implemented by the processing module 901 shown in Figure 9. For detailed descriptions of the processor 1011 and the transceiver 1010, please refer to Figure 9 or the method embodiment shown above and will not be described in detail here.

[0349] In the above-mentioned embodiments, the description of the relevant steps and information can be referred to the introduction in the above method embodiment, and will not be described in detail here.

[0350] In various implementations of the communication device shown in FIG10 , the transceiver may include a receiver and a transmitter, wherein the receiver is configured to perform a receiving function (or operation) and the transmitter is configured to perform a transmitting function (or operation). The transceiver is configured to communicate with other devices / devices via a transmission medium.

[0351] Optionally, the communication device 100 may further include one or more memories 1030 for storing program instructions and / or data. The memory 1030 is coupled to the processor 1011. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1011 may operate in conjunction with the memory 1030. The processor 1011 may execute program instructions stored in the memory 1030. Optionally, at least one of the above-mentioned one or more memories may be included in the processor.

[0352] The specific connection medium between the transceiver 1010, processor 1011, and memory 1030 is not limited in the embodiments of the present application. In Figure 10, the memory 1030, processor 1011, and transceiver 1010 are connected via bus 1040. The bus is represented by a bold line in Figure 10. The connection methods between other components are merely illustrative and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, Figure 10 only uses a single bold line, but this does not mean that there is only one bus or only one type of bus.

[0353] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., and may implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present application may be directly implemented as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor, etc.

[0354] In the embodiment of the present application, memory may include but is not limited to non-volatile memories such as hard disk drive (HDD) or solid-state drive (SSD), random access memory (RAM), erasable programmable read-only memory (EPROM), read-only memory (ROM) or portable read-only memory (CD-ROM), etc. Memory is any storage medium that can be used to carry or store program code in the form of instructions or data structures, and can be read and / or written by a computer (such as the communication device shown in the present application), but is not limited thereto. The memory in the embodiment of the present application can also be a circuit or other arbitrarily capable of realizing a storage function, for storing program instructions and / or data.

[0355] The processor 1011 is primarily used to process communication protocols and communication data, control the entire communication device, execute software programs, and process software program data. The memory 1030 is primarily used to store software programs and data. The transceiver 1010 may include a control circuit and an antenna. The control circuit is primarily used to convert baseband signals into radio frequency signals and process radio frequency signals. The antenna is primarily used to transmit and receive radio frequency signals in the form of electromagnetic waves. Input / output devices, such as a touch screen, display, and keyboard, are primarily used to receive user input and output data to the user.

[0356] When the communication device is powered on, the processor 1011 can read the software program in the memory 1030, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 1011 performs baseband processing on the data to be sent and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 1011. The processor 1011 converts the baseband signal into data and processes the data.

[0357] In another implementation, the RF circuit and antenna may be provided independently of the processor performing baseband processing. For example, in a distributed scenario, the RF circuit and antenna may be remotely arranged independent of the communication device.

[0358] The communication device shown in the embodiment of the present application may also have more components than those in Figure 10, and the embodiment of the present application is not limited to this. The method performed by the processor and transceiver shown above is only an example. For the specific steps performed by the processor and transceiver, please refer to the method described above.

[0359] In another possible implementation, in the communication device shown in FIG9 , the processing module 901 may be one or more logic circuits, and the transceiver module 902 may be an input / output interface, or may be called a communication interface, or an interface circuit, or an interface, etc. Alternatively, the transceiver module 902 may also be a sending module and a receiving module, the sending module may be an output interface, the receiving module may be an input interface, and the sending module and the receiving module are integrated into one module, such as an input / output interface. As shown in FIG11 , the communication device shown in FIG11 includes a logic circuit 1101 and an interface 1102. That is, the processing module 901 may be implemented using a logic circuit 1101, and the transceiver module 902 may be implemented using an interface 1102. The logic circuit 1101 may be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, etc., and the interface 1102 may be a communication interface, an input / output interface, a pin, etc. For example, FIG11 is illustrated using the communication device as a chip, and the chip includes a logic circuit 1101 and an interface 1102.

[0360] In the embodiment of the present application, the logic circuit and the interface may also be coupled to each other. The embodiment of the present application does not limit the specific connection method of the logic circuit and the interface. For example, the logic circuit 1101 can be used to perform the functions or steps implemented by the processing module 901 shown in Figure 9, and the interface 1102 can be used to perform the functions or steps implemented by the transceiver module 902 shown in Figure 9. For a specific description of the logic circuit 1101 and the interface 1102, please refer to Figure 9 or the method embodiment shown above, and will not be described in detail here.

[0361] The above description of the communication device is only an example. For the specific description of the communication device shown in Figure 11, please refer to the above method embodiment or Figure 9 or Figure 10, which will not be described in detail here.

[0362] The communication device shown in the embodiment of the present application can implement the method provided in the embodiment of the present application in the form of hardware, or can implement the method provided in the embodiment of the present application in the form of software, etc., and the embodiment of the present application is not limited to this.

[0363] In the above embodiments, the description of the relevant steps and information can refer to the introduction of the above method embodiment, and will not be described in detail here. For the specific implementation of each embodiment shown in Figure 11, you can also refer to the above embodiments, and will not be described in detail here.

[0364] An embodiment of the present application further provides a communication system, which includes a terminal device and a network device. The terminal device and the network device can interact to execute all or part of the steps in any of the aforementioned method embodiments.

[0365] In addition, the present application also provides a computer program, which is used to implement the operations and / or processing performed by each communication device in the method provided by the present application.

[0366] The present application also provides a computer-readable storage medium having computer code stored therein. When the computer code is run on a computer, the computer executes the operations and / or processing performed by each communication device in the method provided by the present application.

[0367] The present application also provides a computer program product, which includes computer code or computer program. When the computer code or computer program is run on a computer, the operations and / or processes performed by the method provided in the present application are executed.

[0368] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or can be electrical, mechanical or other forms of connection.

[0369] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the technical effects of the solutions provided in the embodiments of the present application.

[0370] In addition, the functional modules in the various embodiments of the present application may be integrated into a processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module. The above-mentioned integrated modules may be implemented in the form of hardware or software functional modules.

[0371] If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned readable storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0372] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: include: Acquire first indication information, where the first indication information is used to indicate a reference energy ratio projected onto a downlink channel by a space-frequency joint basis; Determine a first space-frequency joint basis matrix to be reported according to the energy proportion and the current downlink channel; Sending first feedback information, wherein the first feedback information includes the first space-frequency joint basis or a first basis difference matrix, and the first basis difference matrix includes a difference between the first space-frequency joint basis matrix and a reported second space-frequency joint basis matrix.

2. The method according to claim 1, characterized in that The first feedback information also includes a first vector difference matrix, which is a matrix composed of the difference parts of the first vector matrix and the second vector matrix. The first vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the first space-frequency joint basis matrix on the diagonal elements, and the second vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the second space-frequency joint basis matrix on the diagonal elements.

3. The method according to claim 1 or 2, characterized in that: Determining a first space-frequency joint basis matrix to be reported according to the energy proportion and the current downlink channel includes: A first space-frequency joint basis matrix is ​​selected from an initial space-frequency joint basis matrix according to the energy proportion, wherein the reported second space-frequency joint basis matrix is ​​also selected from the initial space-frequency joint basis matrix, and the initial space-frequency joint basis matrix is ​​obtained by eigendecomposing the space-frequency statistical covariance matrix of the downlink channel.

4. The method according to claim 3, characterized in that Also includes: Second indication information is received, where the second indication information is used to instruct reporting of the first feedback information.

5. The method according to any one of claims 1 to 4, characterized in that: Also includes: Receive third indication information, where the third indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to carry the first basis difference matrix.

6. The method according to claim 5, characterized in that Also includes: Second feedback information is sent, wherein the second feedback information is used to indicate the number of space-frequency joint basis in the first basis difference matrix.

7. The method according to any one of claims 1 to 6, characterized in that: The obtaining of the first indication information includes: Receive first indication information.

8. A communication method, characterized in that: include: Sending first indication information, where the first indication information is used to indicate a reference energy ratio projected onto a downlink channel by a space-frequency joint basis; Receive first feedback information, wherein the first feedback information includes a first space-frequency joint basis matrix or a first basis difference matrix, the first basis difference matrix includes a difference between the first space-frequency joint basis matrix and a reported second space-frequency joint basis matrix, and the reference capability ratio is used to determine the first space-frequency joint basis matrix.

9. The method according to claim 8, characterized in that The first feedback information also includes a first vector difference matrix, which is a matrix composed of the difference parts of the first vector matrix and the second vector matrix. The first vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the first space-frequency joint basis matrix on the diagonal elements, and the second vector matrix is ​​a vector matrix obtained by combining the eigenvalues ​​corresponding to the space-frequency joint basis in the second space-frequency joint basis matrix on the diagonal elements.

10. The method according to claim 8 or 9, characterized in that: Also includes: Send second indication information, where the second indication information is used to instruct reporting of the first feedback information.

11. The method according to claim 10, characterized in that Also includes: Determine that the first feedback information can continue to be reported.

12. The method according to any one of claims 8 to 11, characterized in that: Also includes: Send third indication information, where the third indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to carry the first basis difference matrix.

13. The method according to claim 12, characterized in that Also includes: Second feedback information is received, wherein the second feedback information is used to indicate the number of space-frequency joint basis in the first basis difference matrix.

14. The method according to any one of claims 8 to 13, characterized in that: Also includes: According to the first basis difference matrix, a demodulation reference signal DMRS is used to assist in updating a sounding reference signal SRS channel.

15. A communication method, characterized in that: include: Sending third feedback information, wherein the third feedback information includes a third space-frequency joint basis matrix; Send fourth feedback information, where the fourth feedback information is used to indicate a first energy proportion, where the first energy proportion includes an energy proportion projected onto a current downlink channel by a space-frequency joint basis.

16. The method according to claim 15, characterized in that The fourth feedback information includes the value of the first energy ratio.

17. The method according to claim 15, characterized in that The fourth feedback information includes an index corresponding to the first energy proportion.

18. The method according to any one of claims 15 to 17, characterized in that: Also includes: receiving fourth indication information, wherein the fourth indication information is used to instruct to re-report the space-frequency joint basis matrix; Fifth feedback information is sent, wherein the fifth feedback information includes a fourth space-frequency joint basis matrix.

19. The method according to any one of claims 15 to 17, characterized in that: Also includes: receiving fourth indication information, wherein the fourth indication information is used to instruct to re-report the space-frequency joint basis matrix; Sending sixth feedback information, wherein the sixth feedback information includes a difference matrix, and the difference matrix includes a difference between a space-frequency joint basis in a fourth space-frequency joint basis matrix and a space-frequency joint basis in the third space-frequency joint basis matrix.

20. The method according to claim 18 or 19, characterized in that Also includes: Receive fifth indication information, wherein the fifth indication information is used to indicate a second energy proportion, and the second energy proportion includes an energy proportion projected onto a current downlink channel by a space-frequency joint basis; The fourth space-frequency joint basis is determined according to the second energy ratio.

21. The method according to any one of claims 15 to 20, characterized in that: The third feedback information further includes a third vector matrix, where the third vector matrix is ​​a vector matrix obtained by combining eigenvalues ​​corresponding to the space-frequency joint basis in the third space-frequency joint basis matrix on diagonal elements.

22. The method according to any one of claims 15 to 20, characterized in that: The sending of the fourth feedback information includes: The fourth feedback information is sent periodically.

23. A communication method, characterized in that: include: receiving third feedback information, wherein the third feedback information includes a third space-frequency joint basis matrix; Fourth feedback information is received, where the fourth feedback information is used to indicate a first energy proportion, and the first energy proportion includes an energy proportion projected onto a current downlink channel by a space-frequency joint basis.

24. The method according to claim 23, characterized in that Also includes: Sending fourth indication information, wherein the fourth indication information is used to instruct to re-report the space-frequency joint basis matrix; Fifth feedback information is received, wherein the fifth feedback information includes a fourth space-frequency joint basis matrix.

25. The method according to claim 24, characterized in that Also includes: Determine that the first energy proportion is less than a preset energy proportion threshold.

26. A communication device, characterized in that: The communication device comprises a module for executing the method according to any one of claims 1-7 and 15-22; or, the communication device comprises a processor, and the processor is used to execute the method according to any one of claims 1-7 and 15-22.

27. A communication device, characterized in that: The communication device comprises a module for executing the method as claimed in any one of claims 8-14 and 23-25; or, the communication device comprises a processor, and the processor is used to execute the method as claimed in any one of claims 8-14 and 23-25.

28. A communication device, characterized in that: comprising a logic circuit and an interface, wherein the logic circuit and the interface are coupled; The interface is used to input and / or output information, and the logic circuit is used to execute the method according to any one of claims 1-25.

29. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program. When the computer program is executed, the method according to any one of claims 1 to 25 is executed.

30. A communication system, characterized in that: It comprises a network device and a terminal device, wherein the terminal device is used to execute the method according to any one of claims 1-7 and 15-22, and the network device is used to execute the method according to any one of claims 8-14 and 23-25.

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