Method and apparatus for feeding back information

Abstract

A method and apparatus for feeding back information. The method comprises: a terminal performs channel estimation on a downlink reference signal, to obtain downlink channel information; the terminal obtains, in an electromagnetic map, first multipath information; on the basis of the downlink channel information and the first multipath information, the terminal determines a first mode in which the terminal feeds back the downlink channel information to an access network device; and, on the basis of the first mode, the terminal feeds back first information to the access network device. The access network device may, on the basis of the first information, recover the downlink channel information between the access network device and the terminal, so that the communication quality between the terminal and the access network device is improved.

Description

Method and device for feedback information

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on December 25, 2023, with application number 202311809115.0 and application name "A method and device for feedback information", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The embodiments of the present application relate to the field of communication technologies, and in particular to a method and apparatus for feedback information. Background Art

[0004] With the continuous development of wireless communications, wireless communication application scenarios are becoming increasingly diverse, such as smartphones, the Internet of Vehicles, and the Internet of Things. As the number of terminals increases, so too does the demand for communication quality. Next-generation wireless communication systems are expected to generate large amounts of over-the-air data, such as channel information. How to efficiently feed this information back to access network equipment is a research area. Summary of the Invention

[0005] The embodiments of the present application provide a method and apparatus for feedback information, in order to reduce the transmission overhead caused by air interface data and improve information feedback efficiency.

[0006] In a first aspect, a method for feedback information is provided, which is applied to a first communication device and includes: obtaining a downlink reference signal, where the downlink reference signal is used to determine downlink channel information; obtaining an electromagnetic map, where the electromagnetic map includes first multipath information; and feeding back first information to a second communication device, where the first information is associated with a first mode in which the first communication device feeds back downlink channel information to the second communication device, where the first mode is determined based on the downlink channel information and the first multipath information.

[0007] Through the above design, the first communication device integrates the electromagnetic map into the feedback of the downlink channel information. The first communication device can determine the first mode of the feedback information based on the similarity between the first multipath information of the electromagnetic map and the downlink channel information, and feed back the first information to the second communication device based on the first mode, thereby maintaining good communication performance while improving compression efficiency.

[0008] In one possible design, the first information includes: second multipath information and / or location information, the second multipath information is obtained by calibrating the downlink channel information based on the first multipath information, and the location information includes the location information of the first communication device, or the location information of the reference point corresponding to the first multipath information.

[0009] The above design corrects the downlink channel information based on the electromagnetic map, effectively utilizing prior knowledge of the physical channel to help improve channel data feedback and enhance performance.

[0010] In one possible design, the second multipath information includes an arrival angle and a departure angle, where the arrival angle and the departure angle are determined based on the downlink channel information. Optionally, the second multipath information also includes power and / or delay, where the power is determined based on the first multipath information, and the delay is determined based on the first multipath information or the downlink channel information.

[0011] In one possible design, the first mode includes feeding back the second multipath information, or the first mode includes feeding back location information.

[0012] In one possible design, the first information includes channel state information (CSI) related information. The first mode includes feedback of CSI related information.

[0013] In one possible design, it also includes: obtaining indication information of a threshold from the second communication device.

[0014] In one possible design, the first mode is determined based on the downlink channel information and the first multipath information, including: the first mode is determined based on the downlink channel information, the first multipath information and the second multipath information.

[0015] In one possible design, the first mode is determined based on the downlink channel information, the first multipath information, and the second multipath information, including: the first mode is determined based on similarities between the first reconstructed channel and the second reconstructed channel and the first channel;

[0016] The first reconstructed channel is determined according to the first multipath information, the second reconstructed channel is determined according to the second multipath information, and the first channel is a channel corresponding to the downlink channel information.

[0017] In one possible design, the first mode is determined based on the similarity between the first reconstructed channel and the second reconstructed channel and the first channel, including: the first mode is determined based on the similarity between the first reconstructed channel and the second reconstructed channel and the first channel and a threshold.

[0018] In one possible design, the first mode is determined based on the similarity between the first reconstructed channel and the second reconstructed channel and the first channel, including: the first mode is determined based on the similarity between the first reconstructed channel, the second reconstructed channel and the third reconstructed channel and the first channel, and the third reconstructed channel is the reconstructed channel corresponding to the CSI-related information.

[0019] In one possible design, the reference point corresponding to the first multipath information matches the downlink channel information, or the reference point corresponding to the first multipath information matches the location information of the first communication device.

[0020] In one possible design, the downlink channel information includes third multipath information, and the third multipath information is determined based on a channel estimation result of the downlink reference signal.

[0021] The second aspect is a device corresponding to the first aspect. For beneficial effects, please refer to the description of the first aspect. A method for feedback information is provided, which is applied to a second communication device, including: sending a downlink reference signal to a first communication device, where the downlink reference signal is used to determine downlink channel information; sending an electromagnetic map to the first communication device, where the electromagnetic map includes first multipath information; and receiving first information from the first communication device, where the first information is associated with a first mode in which the first communication device feeds back downlink channel information to the second communication device, where the first mode is determined based on the downlink channel information and the first multipath information.

[0022] In one possible design, the first information includes: second multipath information and / or location information, the second multipath information is obtained by calibrating the downlink channel information based on the first multipath information, and the location information includes the location information of the first communication device, or the location information of the reference point corresponding to the first multipath information.

[0023] In one possible design, the second multipath information includes an arrival angle and a departure angle, and the arrival angle and the departure angle are determined based on the downlink channel information.

[0024] In one possible design, the second multipath information also includes power and / or delay, the power is determined based on the first multipath information, and the delay is determined based on the first multipath information or the downlink channel information.

[0025] In one possible design, the first mode includes feeding back the second multipath information, or the first mode includes feeding back location information.

[0026] In one possible design, the first information includes channel state information (CSI) related information, and the first mode includes feedback CSI related information.

[0027] In one possible design, it also includes: sending threshold indication information to the first communication device.

[0028] In one possible design, the first mode is determined based on the downlink channel information and the first multipath information, including: the first mode is determined based on the downlink channel information, the first multipath information and the second multipath information.

[0029] In one possible design, the first mode is determined based on the downlink channel information, the first multipath information, and the second multipath information, including: the first mode is determined based on similarities between the first reconstructed channel and the second reconstructed channel and the first channel;

[0030] The first reconstructed channel is determined according to the first multipath information, the second reconstructed channel is determined according to the second multipath information, and the first channel is a channel corresponding to the downlink channel information.

[0031] In one possible design, the first mode is determined based on the similarity between the first reconstructed channel and the second reconstructed channel and the first channel, including: the first mode is determined based on the similarity between the first reconstructed channel and the second reconstructed channel and the first channel and a threshold.

[0032] In one possible design, the first mode is determined based on the similarity between the first reconstructed channel and the second reconstructed channel and the first channel, including: the first mode is determined based on the similarity between the first reconstructed channel, the second reconstructed channel and the third reconstructed channel and the first channel, and the third reconstructed channel is the reconstructed channel corresponding to the CSI-related information.

[0033] In one possible design, the reference point corresponding to the first multipath information matches the downlink channel information, or the reference point corresponding to the first multipath information matches the location information of the first communication device.

[0034] In one possible design, the downlink channel information includes third multipath information, and the third multipath information is determined based on a channel estimation result of the downlink reference signal.

[0035] In a third aspect, a device is provided that can implement the method of the first aspect. For example, the device includes means for performing the method of the first aspect. The device can be implemented in hardware, software, or by executing the corresponding software implementation in hardware.

[0036] In one possible design, the apparatus includes a unit for executing the above-mentioned first aspect.

[0037] In one possible design, the apparatus includes a processor configured to execute the method of the first aspect.

[0038] In one possible design, the device includes a processing circuit and an interface circuit. The interface circuit is configured to receive signals from a device outside the device and transmit them to the processing circuit, or to transmit signals from the processing circuit to the device outside the device. The processing circuit implements the method of the first aspect described above by means of a logic circuit or by executing code instructions. Alternatively, the processing circuit may be a processor, and the interface circuit may be a transceiver or an input / output interface.

[0039] In one possible design, the device includes a processor and a memory; wherein the processor is used to execute a computer program or instructions stored in the memory; the memory is used to store the computer program or the instructions; when the computer program or the instructions are run, the method of the first aspect is executed.

[0040] Optionally, the device may be the first device, or a module or unit (for example, a chip, or a chip system, or a circuit) in the first device that corresponds one-to-one to the method / operation / step / action described in the first aspect, or a device that can be used in combination with the first device.

[0041] In a fourth aspect, a device is provided that can implement the method of the second aspect. For example, the device includes means for executing the method of the second aspect. The device can be implemented in hardware, software, or by executing the corresponding software implementation in hardware.

[0042] In one possible design, the apparatus includes a unit for executing the second aspect described above.

[0043] In one possible design, the device includes a processor, which is used to execute the method of the second aspect above.

[0044] In one possible design, the device includes a processing circuit and an interface circuit, the interface circuit is used to receive signals from other devices outside the device and transmit them to the processing circuit or send signals from the processing circuit to other devices outside the device, and the processing circuit is used to implement the method in the above-mentioned second aspect through a logic circuit or executing code instructions.

[0045] In one possible design, the device includes a processor and a memory; wherein the processor is used to execute a computer program or instructions stored in the memory; the memory is used to store the computer program or the instructions; when the computer program or the instructions are run, the method of the second aspect is executed.

[0046] Optionally, the device may be a second device, or a module or unit (for example, a chip, or a chip system, or a circuit) in the second device that corresponds one-to-one to the method / operation / step / action described in the second aspect, or may be capable of being used in combination with the second device.

[0047] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program or instruction. When the computer program or instruction is run on a computer, the computer executes the method of the first aspect or the second aspect mentioned above.

[0048] In a sixth aspect, a computer program product is provided, wherein the computer program product includes a computer program or instructions for executing the method described in the first aspect, or the computer program product includes a computer program or instructions for executing the method described in the second aspect.

[0049] In the seventh aspect, a chip is provided, comprising a processor, wherein the processor is coupled to a memory and is configured to execute a computer program or instruction stored in the memory, so that the chip implements the method of the first or second aspect above.

[0050] In an eighth aspect, a communication system is provided, comprising: a first communication device and a second communication device; wherein the first communication device is used to implement the method of the first aspect, and the second communication device is used to implement the method of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0052] FIG2 is a schematic diagram of an electromagnetic map provided in an embodiment of the present application;

[0053] FIG3 is a flow chart of a method for providing feedback information according to an embodiment of the present application;

[0054] FIG4 is a schematic diagram of calibrating multipath information provided by an embodiment of the present application;

[0055] FIG5 is a schematic diagram of multipath information matching provided in an embodiment of the present application;

[0056] FIG6 is another schematic diagram of calibrating multipath information provided by an embodiment of the present application;

[0057] FIG7 is a schematic diagram of a module for selecting a feedback mode according to an embodiment of the present application;

[0058] FIG8 is a schematic diagram of a flow chart of selecting a feedback mode according to an embodiment of the present application;

[0059] FIG9 is a schematic structural diagram of a device provided in an embodiment of the present application;

[0060] FIG10 is another schematic structural diagram of the device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of this application more clear, the application will be further described in detail below with reference to the accompanying drawings. The specific operation methods and functional descriptions in the method embodiments can also be applied to the device embodiments or system embodiments.

[0062] The various numbers and terms such as "first" and "second" used in the embodiments of this application are merely for convenience of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily indicate the order in which they are executed. The order in which the processes are executed should be determined by their functions and internal logic.

[0063] In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. "Including at least one of A, B or C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0064] Figure 1 shows a possible, non-limiting system diagram. As shown in Figure 1 , a communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. Optionally, the Internet 300 is also included.

[0065] 1. RAN

[0066] The RAN 100 includes at least one RAN node (e.g., 110a and 110b in FIG. 1 , collectively referred to as 110) and at least one terminal (e.g., 120a to 120j in FIG. 1 , collectively referred to as 120). The RAN 100 may also include other RAN nodes, such as wireless relay equipment and / or wireless backhaul equipment (not shown in FIG. 1).

[0067] Terminal 120 can be connected to RAN node 110 wirelessly. RAN node 110 is connected to core network 200 wirelessly or by wire. The core network element in core network 200 and RAN node 110 in RAN 100 can be different physical devices, or they can be a single physical device that integrates the logical functions of the core network element and the logical functions of the radio access network.

[0068] The multiple RAN nodes 110 in the communication system 10 can be nodes of the same type or different types. In some scenarios, the roles of the RAN nodes 110 and the terminals 120 are relative. For example, in FIG1 , the network element 120i can be a helicopter or a drone, which can be configured as a mobile base station. For the terminals 120j accessing the RAN 100 through the network element 120i, the network element 120i is a base station; however, for the base station 110a, the network element 120i is a terminal.

[0069] RAN100 can be a cellular system related to the Third Generation Partnership Project (3GPP), such as a fourth generation (4G) mobile communication system, a fifth generation (5G) mobile communication system, or a future-oriented evolution system, such as a sixth generation (6G) mobile communication system. RAN100 can also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. RAN100 can also be a communication system that integrates two or more of the above systems.

[0070] 1.1 RAN Node

[0071] In one possible scenario, a RAN node may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next generation NodeB (gNB), a next generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. A RAN node may be a macro base station (such as 110a in FIG1 ), a micro base station or an indoor station (such as 110b in FIG1 ), a relay node or a donor node, or a wireless controller in a CRAN scenario. Optionally, a RAN node may also be a server, a wearable device, a vehicle or an onboard device. For example, an access network device in vehicle to everything (V2X) technology may be a road side unit (RSU). All or part of the functions of the RAN node in the embodiments of the present application may also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (such as a cloud platform). The RAN node in the embodiments of the present application may also be a logical node, a logical module, or software that can implement all or part of the functions of the RAN node.

[0072] In another possible scenario, multiple RAN nodes collaborate to assist the terminal in achieving wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately, or they can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0073] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0074] A RAN node, sometimes also referred to as an access network device, RAN entity, or access node, constitutes part of a communication system and helps terminals achieve wireless access. In the subsequent description of this application, unless otherwise specified, the term "access network device" is used for description.

[0075] It is understandable that the access network device can be referred to as a communication device. For example, the access network device can be understood as a device having the function of an access network device. For example, the device for implementing the function of the access network device can be the access network device; or some components in the access network device, such as CU, DU, etc. It can also be a device that can support the access network device to implement the function, such as a chip system, a hardware circuit, a software module, or a hardware circuit plus a software module. The device can be installed in the access network device or can be used in conjunction with the access network device. In the embodiment of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0076] 1.2 Terminal

[0077] A terminal may also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality (VR), augmented reality (AR), industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. The terminal can be a mobile phone, a head-mounted display device, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, a drone, a helicopter, an airplane, a ship, a robot, a robotic arm, a smart home device, etc. The embodiments of the present application do not limit the device form of the terminal.

[0078] It is understood that a terminal can be referred to as a communication device. For example, a terminal can be understood as a device that has terminal functions. For example, a device used to implement the terminal function can be a terminal; it can also be a device that supports the terminal in implementing the function, such as a chip system, hardware circuit, software module, or hardware circuit and software module, which can be installed in the terminal or can be used in conjunction with the terminal.

[0079] 2. CN

[0080] CN200 includes at least one core network element. Taking the 5G communication system as an example, CN200 includes the access and mobility management function (AMF) network element, the session management function (SMF) network element, the user plane function (UPF) network element, the policy control function (PCF) network element, the unified data management (UDM) network element, and the application function (AF) network element.

[0081] In the communication system shown in FIG1 , an electromagnetic map is provided in the access network device. For example, the access network device establishes an electromagnetic map through actual measurement, environmental modeling + ray tracing (RT), or artificial intelligence (AI). The electromagnetic map is used to characterize the distribution of electromagnetic signals in the environment. It records the strength and characteristics of various electromagnetic signals in a specific area. For example, the electromagnetic map may partially or completely include, but is not limited to: multipath information, noise level, and spectrum occupancy of one or more locations. For example, the electromagnetic map may include information on regular areas and / or information on irregular areas, each area corresponding to one or more reference points. Regular areas may also be referred to as grid areas, and the reference points corresponding to the grid areas may also be referred to as grids, or grid points, etc. Exemplarily, an area may include the following information:

[0082] 1. Channel state information

[0083] a) at least one path, each path corresponding to a multipath information;

[0084] b) Scalar strength indicators, such as channel impulse response (CIR), channel quality indicator (CQI), power delay profile (PDP), or angle delay profile (ADP).

[0085] 2. Information about the virtual anchor of the scattering point or virtual station.

[0086] 3. Other information.

[0087] Taking the multipath information in the channel state information as an example, the electromagnetic map on the access network equipment side Corresponding to at least one reference point, each reference point corresponds to a geographical area, which is used to characterize the multipath information from the access network equipment to the terminal in this geographical area. As shown in Figure 2, the electromagnetic map Mainly include:

[0088] 1. Electromagnetic map elements of N reference points N is an integer greater than zero.

[0089] 2. Electromagnetic map elements for each reference point Including the M between the access network equipment and the reference point n Multipath information of a path, M n An integer greater than zero.

[0090] 3. The multipath information of each path may include amplitude, delay, and angle. Among them, the amplitude can exist in the form of signal amplitude or power. If the access network device uses a dual-polarized antenna, the amplitude is a 2*2 matrix, and the angle includes the angle of arrival (AoA) and the angle of departure (AoD). Furthermore, if the antenna array is a uniform linear array (ULA), AoA and AoD are scalars. Alternatively, if the antenna array is a uniform planar array (UPA), AoA and AoD can be expressed in terms of pitch angle and yaw angle. In the following description, "amplitude" is taken as "power" as an example, and the angle includes AoA and AoD as an example for description.

[0091] In the communications system shown in Figure 1, the access network device sends a downlink reference signal, such as a channel state information (CSI) reference signal (RS), to the terminal. The terminal performs channel estimation on the downlink reference signal to obtain a channel estimation result, which includes a downlink channel matrix H. The terminal determines the CSI based on the downlink channel matrix H. The terminal then feeds the CSI back to the access network device. The access network device recovers the downlink channel matrix H based on the received CSI. The access network device performs precoding and other operations on the downlink data based on the recovered downlink channel matrix H, thereby improving the quality of downlink data transmission. To reduce the overhead of the terminal feeding back CSI to the access network device, the terminal compresses the CSI and feeds the compressed CSI back to the access network device. The access network device decompresses the received compressed CSI, determines the CSI, and further recovers the downlink channel matrix H. For example, the terminal compresses the CSI through frequency domain transform, quantization, selection of non-zero coefficients, or other methods, or the terminal may compress the CSI using AI or other methods, without limitation.

[0092] Compared to simply feeding back CSI, terminals can feed back complete downlink channel information to access network equipment, thereby improving communication quality between the terminal and the access network equipment. This downlink channel information between the terminal and the access network equipment is determined by the transmission path and electromagnetic environment between the two devices. Since electromagnetic maps in wireless communications represent the distribution of electromagnetic signals in the environment, recording the strength and characteristics of electromagnetic signals within a specific area, designing how terminals can feed downlink channel information to access network equipment based on electromagnetic maps is a research topic.

[0093] In view of this, embodiments of the present application provide a method and apparatus for feedback information. The method includes: a terminal performing channel estimation on a downlink reference signal to obtain downlink channel information; the terminal obtaining first multipath information from an electromagnetic map; and the terminal determining, based on the downlink channel information and the first multipath information, a first mode for feeding back the downlink channel information from the terminal to an access network device. The terminal feeds back first information to the access network device based on the first mode. Based on the first information, the access network device can restore the downlink channel information between the access network device and the terminal, thereby improving the communication quality between the terminal and the access network device.

[0094] In the following process description, "terminal" and "access network device" are used as the execution entities. "Terminal" can be understood as a device with terminal functions. For example, "terminal" can be replaced by "first communication device", and the first communication device is a device that implements the terminal function. For example, the first communication device is a terminal, or the first communication device can be a module in the terminal (for example, a chip or circuit, etc.). "Access network device" can be understood as a device with access network device functions. For example, "access network device" can be replaced by "second communication device", and the second communication device is a device that implements the access network device function. For example, the second communication device is an access network device, or the second communication device can be a module in the access network device (for example, a chip or circuit, etc.), or it can be a logical node (for example, CU, DU or RU), a logical module or software that fully or partially implements the access network device function.

[0095] As shown in FIG3 , the embodiment of the present application provides a flow chart, including:

[0096] Step 300: The access network device sends a downlink reference signal to the terminal, and the terminal receives the downlink reference signal from the access network device.

[0097] Optionally, the downlink reference signal may also be referred to as a downlink pilot, or simply a pilot. The downlink reference signal is used to determine downlink channel information. For example, the terminal determines the downlink channel information based on the downlink reference signal. The downlink channel information includes third multipath information, and the third multipath information is determined based on the channel estimation result of the downlink reference signal. For example, the terminal performs channel estimation on the downlink reference signal to obtain a channel estimation result, and the channel estimation result includes a downlink channel matrix H. The terminal extracts the third multipath information from the downlink channel matrix H. The third multipath information is obtained by the terminal through channel estimation based on the downlink reference signal, and the third multipath information may be referred to as local multipath information. For example, the method for determining the third multipath information includes but is not limited to the following methods:

[0098] 1. Determine the third multipath information using traditional channel estimation and multipath estimation algorithms. For example, after performing channel estimation on the downlink reference signal, perform delay and angle estimation using traditional multipath estimation algorithms such as multiple signal classification (MUSIC), estimating signal parameter via rotational invariance techniques (ESPRIT), or iterative adaptive approach (IAA). Then, use a peak-finding algorithm to extract the delays and angles corresponding to the N largest peaks as the third multipath information.

[0099] 2. An AI-based channel multipath extraction algorithm, such as one that uses a neural network to estimate multipath, determines the third multipath information. For example, the downlink channel matrix H is input into an AI model, and the output of the AI ​​model includes the third multipath information.

[0100] 3. A prediction-based multipath estimation algorithm, such as a prediction scheme based on Kalman filtering, determines the third multipath information.

[0101] Alternatively, the terminal determines the CSI based on the downlink channel matrix H, and extracts the third multipath information from the CSI, etc., without limitation. For example, the third multipath information includes delay, AOA, and AOD. It is understandable that the third multipath information includes multipath information of one path, or multipath information of multiple paths, and the multipath information of each path includes delay, AOA, and AOD. For example, the format of the third multipath information P is as follows: P:{path1,path2,…,path M}={{delay1,AoA1,AoD1},{delay2,AoA2,AoD2},..,{delay M ,AoA M ,AoD M}}

[0102] In the above example, the third multipath information is represented as P. The third multipath information includes multipath information of M multipaths, where M is an integer greater than zero. The multipath information of each path includes delay, AoA, and AoD.

[0103] In one possible implementation, the terminal includes a radio frequency module (component) and a processing module (component). For example, the processing module includes a chip, such as a system on chip (SoC); the radio frequency module may include a radio frequency front end or a radio frequency front end module. The radio frequency module receives a downlink reference signal from an access network device through an air interface. The processing module obtains the downlink reference signal through the radio frequency module. "Receiving a downlink reference signal from an access network device" in step 300 can be replaced with "obtaining a downlink reference signal". For example, the processing module of the terminal obtains a downlink reference signal, which can be understood as the processing module of the terminal obtaining information about the downlink reference signal through an input / output (I / O) interface. For another example, the radio frequency module of the terminal obtains a downlink reference signal. It can be understood that the radio frequency module of the terminal receives a downlink reference signal from the access network device.

[0104] Step 310: The access network device sends an electromagnetic map to the terminal, and the terminal receives the electromagnetic map from the access network device.

[0105] For example, the electromagnetic map includes first multipath information. In one possible implementation, the terminal determines a reference point based on the downlink channel information. The multipath information corresponding to the reference point is referred to as the first multipath information. In this case, it can be described as: the reference point of the first multipath information matches the downlink channel information.

[0106] For example, an electromagnetic map includes at least one reference point, which is also called a grid point. As shown in Figure 2, each reference point corresponds to an electromagnetic map element or multipath information. Including M n Multipath information of each path, M n is an integer greater than zero.

[0107] 1. The terminal matches a reference point in the electromagnetic map according to the third multipath information included in the downlink channel information. The multipath information corresponding to the reference point is called the first multipath information.

[0108] For example, the terminal determines the distance between the third multipath information and each reference point in the electromagnetic map. In the electromagnetic map, the reference point with the smallest distance to the third multipath information is determined. The multipath information corresponding to this reference point is the first multipath information, which can be referred to as map multipath information. For example, the electromagnetic map includes five reference points. The terminal determines the distance between the third multipath information and the five reference points respectively. Among the five reference points, the terminal determines the reference point with the smallest distance to the third multipath information, and the multipath information corresponding to this reference point is referred to as the first multipath information. Optionally, the terminal determines the distance between the third multipath information and a reference point in the following manner:

[0109] The third multipath information includes multipath information of at least one path. For example, the third multipath information includes multipath information of M paths, where M is an integer greater than zero. The third multipath information P is represented as: {path1,…,path M Multipath information of reference point l in electromagnetic map Including M l The multipath information of the path, the multipath information of the reference point l Expressed as: M l is an integer greater than zero, and the reference point l is any reference point in the electromagnetic map.

[0110] For a path m in the third multipath information P, the path m is represented as path m , m is a positive integer greater than or equal to 1 and less than or equal to M. The terminal determines the path path m Multipath information with reference point l The distance of each path in the reference point l. Optionally, the distance between two paths is equal to the delay between the two paths, the Euclidean distance between the AoA, or the AoD. The terminal determines the path path m The path with the minimum distance can be expressed as The value of m is traversed from 1 to M, and the path path m With path The sum of the distances is called the third multipath information P and the multipath information of the reference point l. It can be understood that the third multipath information P and the multipath information of the reference point l The distance between the third multipath information P and the reference point l can be called the distance between the third multipath information P and the reference point l. distance, satisfying:

[0111] in, Indicates the path in the third multipath information P m Multipath information with reference point l One path distance.

[0112] 2. The terminal matches multiple reference points in the electromagnetic map according to the third multipath information. The multipath information corresponding to the multiple reference points is called first multipath information.

[0113] For example, the terminal determines the first K reference points with the smallest distance to the third multipath information among the reference points on the electromagnetic map, where K is an integer greater than 1. For example, the terminal determines the first two reference points with the smallest distance to the third multipath information among the five reference points on the electromagnetic map, where the value of K is 2. In this case, the multipath information of the K reference points is called the first multipath information. Optionally, the multipath information of the K reference points (the first multipath information) is expressed as

[0114] In another possible implementation, the terminal determines a reference point in the electromagnetic map based on the terminal's location information. The multipath information corresponding to the reference point is referred to as first multipath information. In this case, it can be described as follows: the reference point corresponding to the first multipath information matches the terminal's location information.

[0115] 1. The terminal matches a reference point in the electromagnetic map according to the terminal's location information. The multipath information corresponding to the reference point is called the first multipath information.

[0116] For example, the location information of the terminal includes the geographical coordinates of the terminal. For example, the geographical coordinates of the terminal include the longitude coordinates and latitude coordinates of the terminal. Further, it also includes: the height coordinates of the terminal. Based on the location information of the terminal, the terminal determines a reference point closest to the terminal in the electromagnetic map. The multipath information corresponding to the reference point is called the first multipath information. The aforementioned closest reference point is represented as reference point 1, and the multipath information of reference point 1 (the first multipath information) is represented as It is understood that when measuring the distance between a terminal and a reference point, the center position of the reference point is used as a reference. That is, the terminal can calculate the distance between the terminal and the center position of the reference point and use the distance between the terminal and the center position of the reference point as the distance between the terminal and the reference point. Alternatively, the terminal can determine a matching reference point in an electromagnetic map based on the terminal's location information. For example, the geographical area corresponding to the matching reference point can cover the terminal's location. The multipath information corresponding to the matching reference point is referred to as first multipath information.

[0117] 2. The terminal matches multiple reference points in the electromagnetic map according to the terminal's location information. Multipath information corresponding to the multiple reference points is called first multipath information.

[0118] For example, based on the terminal's location information, the terminal determines K reference points in the electromagnetic map that are relatively close to the terminal, where K is an integer greater than 1. Alternatively, based on the terminal's location information, the terminal determines K associated reference points in the electromagnetic map. For example, the distance between the center of the K associated reference points and the terminal's location is less than a threshold. The multipath information of the K reference points is referred to as first multipath information.

[0119] In one possible implementation, "receiving an electromagnetic map from an access network device" in step 310 can be replaced with "obtaining an electromagnetic map." For example, "the terminal's processing module obtaining an electromagnetic map" can be understood as the terminal's processing module obtaining the electromagnetic map information through an I / O interface. Another example is "the terminal's radio frequency module obtaining an electromagnetic map" can be understood as the terminal's radio frequency module receiving the electromagnetic map from the access network device.

[0120] It will be appreciated that in step 310, the example in which an access network device transmits an electromagnetic map to a terminal and the terminal obtains the electromagnetic map through the access network device is used, and this is not limiting. The terminal may also obtain the electromagnetic map through other means. For example, the terminal may obtain the electromagnetic map through a device-to-device (D2D) method, for example, when another terminal transmits the electromagnetic map to the terminal. Alternatively, in step 310, multiple access network devices may send electromagnetic maps to the terminal, and the terminal may determine the electromagnetic map described in the embodiments of the present application based on the electromagnetic maps sent by the multiple access network devices. For example, the multiple access network devices may each send a portion of the electromagnetic map, and the terminal may merge the multiple partial electromagnetic maps to form a complete electromagnetic map.

[0121] Step 320: The terminal sends first information to the access network device, and the access network device receives the first information from the terminal.

[0122] It is understood that in the description of this application, "send" can be replaced with "feedback." For example, "a terminal sends first information to an access network device" can be replaced with "the terminal feeds back the first information to the access network device." In one possible implementation, in step 320, the terminal's radio frequency module can send the first information to the access network device via an air interface. For example, the terminal's processing module outputs the first information to the radio frequency module via an I / O interface, and the terminal's radio frequency module then sends the first information to the access network device via the air interface.

[0123] The first information is associated with a first mode in which the terminal feeds downlink channel information to the access network device. The first mode is determined based on the downlink channel information and the first multipath information. Furthermore, the first mode is determined based on the downlink channel information, the first multipath information, and the second multipath information. The second multipath information is obtained by calibrating (adjusting) the downlink channel information based on the first multipath information. The second multipath information can be referred to as calibrated (adjusted) multipath information.

[0124] 1. The terminal calibrates the downlink channel information according to the first multipath information and determines the second multipath information.

[0125] For example, the second multipath information includes AOA and AOD, and the AOA and AOD of the second multipath information are determined based on the downlink channel information. For example, the downlink channel information includes third multipath information, and the AOA and AOD in the second multipath information are determined based on the AOA and AOD in the third multipath information. Optionally, the second multipath information also includes power and delay, and the power is determined based on the first multipath information, for example, the power is determined based on the power in the first multipath information. The delay is determined based on the first multipath information, for example, the delay is determined based on the delay in the first multipath information, or the delay is determined based on the downlink channel information, for example, the delay is determined based on the delay in the third multipath information included in the downlink channel information. In the following description, the process of the terminal determining the second multipath information is described by taking the second multipath information including power, delay, AOA, and AOD as an example.

[0126] In example 1, a terminal matches a reference point in an electromagnetic map, and multipath information corresponding to the reference point is called first multipath information.

[0127] For example, when a terminal matches a reference point in an electromagnetic map, the specific matching rules can be based on the third multipath information included in the downlink channel information, or based on the terminal's location information. For ease of understanding, in the following description, the third multipath information included in the downlink channel information is referred to as local multipath information, the first multipath information is referred to as map multipath information, and the second multipath information is referred to as calibration multipath information.

[0128] In one possible implementation, as shown in FIG4 , the terminal performs channel estimation on the downlink reference signal to determine downlink channel information, such as the downlink channel matrix H. The terminal performs delay estimation and angle estimation on the downlink channel information to determine local multipath information. The local multipath information includes multipath information of M paths, and the local multipath information P is expressed as: {path1,…,path M}, the multipath information of each path includes delay, AOA and AOD. For example, the i-th path i Expressed as: {delay i ,AOA i ,AOD i}, i is an integer greater than 1 and less than or equal to M. In the electromagnetic map, the terminal successfully matches the reference point l. The multipath information of the reference point l is called the map multipath information, which includes M l paths, map multipath information Expressed as: The multipath information of each path includes power, delay, AOA and AOD. For example, the jth path The multipath information is expressed as

[0129] The terminal calibrates the local multipath information based on the multipath information of the matching reference point (e.g., reference point 1) to determine the calibrated multipath information. It will be appreciated that the map multipath information includes multipath information for multiple paths, and the local multipath information includes multipath information for multiple paths. In this embodiment of the present application, the paths in the map multipath information are first matched with the paths in the local multipath information. Then, the corresponding paths in the local multipath information are calibrated based on the matched paths in the map multipath information to determine the calibrated multipath information.

[0130] For example, for the path path in the local multipath information P i , multipath information in the map In the path, determine the path i The path with the shortest distance At this time, it is considered that the two paths are matched, and there may be a corresponding relationship between the two paths. Optionally, you can use the function Measure the distance between two paths. As shown in Figure 5, the value of M is equal to 4, and the local multipath information P is expressed as: {path1, path2, path3, path4}. l The value is equal to 6, map multipath information Expressed as: Multipath information on the map The path with the shortest distance to path1 is The two paths match and there is a corresponding relationship Similarly, path path2 and path Match, there is a corresponding relationship Path path3 and path Match, there is a corresponding relationship Path path4 and path Match, there is a corresponding relationship

[0131] Referring to Figure 4, the calibration multipath information includes paths, Is an integer greater than zero. Calibrate multipath information Expressed as The multipath information of each path includes power, delay, AOA and AOD. k Paths in the map multipath information Match, there is a corresponding relationship As an example, the terminal determines the calibration multipath information The kth path in The process of multipath information, the kth path The multipath information is expressed as:

[0132] 1. Departure angle and arrival angle Use the path in the local multipath information k AoA k ,AoD k .

[0133] 2. Power Use the path in the map multipath information Power

[0134] 3. Multipath delay

[0135] a) Use the path in the map multipath information Delay

[0136] b) Use the path in the map multipath information Delay Or the path in the local multipath information k Delay k In one possible implementation, if the bandwidth of the measured signal is greater than a threshold, a delay is used. k ; If the bandwidth of the measured signal is less than or equal to the threshold, use Alternatively, if the time resolution of the measured signal is less than the threshold, use delay k ; If the time resolution of the measured signal is greater than or equal to the threshold, use

[0137] Example 2: The terminal matches multiple reference points in the electromagnetic map, and the multipath information of the multiple reference points is called first multipath information.

[0138] For example, in an electromagnetic map, a terminal can match multiple reference points based on the third multipath information included in the downlink channel information, or match multiple reference points based on the terminal's location information. For ease of understanding, in the following description, the third multipath information included in the downlink channel information is referred to as local multipath information, the first multipath information is referred to as map multipath information, and the second multipath information is referred to as calibration multipath information.

[0139] In a possible implementation, as shown in FIG6 , the terminal performs delay estimation and angle estimation on the downlink channel information to determine the local multipath information. The local multipath information P is expressed as: {path1,…,path MIn the electromagnetic map, the terminal matches multiple reference points. It matches two reference points, which are represented as reference points l and n. Multipath information of reference point l Including M l A path, which is represented by: Multipath information of reference point n Including M n A path, which is represented by: Each path includes power, delay, AOA and AOD.

[0140] For the kth path in the local multipath information P k , in the multiple reference points above, determine the matching paths respectively. For example, path k The matching paths at the above reference points l and n are respectively and There is a corresponding relationship between the three

[0141] The terminal calibrates the multipath information of the matching path in the local multipath information based on the multipath information of the paths of the multiple reference points (e.g., reference point 1 and reference point n) mentioned above, and determines the calibrated multipath information. For example, the terminal can use the multipath information of reference point 1 to and multipath information of reference point n Match the path in the local multipath information k As shown in Figure 6, the calibration multipath information includes paths, Is an integer greater than zero. Calibrate multipath information Expressed as The kth path The multipath information is expressed as: The determination process is as follows:

[0142] 1. Departure angle and arrival angle Use the path in the local multipath information k AoA k ,AoD k .

[0143] 2. Power In the above multiple reference points, the multipath information of each reference point contains a path k Matching paths, the power in the above matching paths is integrated to determine the power

[0144] For example, in an electromagnetic map, the matching reference points are reference point l and reference point n. The terminal's map multipath information for reference point l Paths that match Power in and multipath information of reference point n Matching paths Power in The fusion result of the two is equal to the power For example, one fusion method includes: and right and Weighted average.

[0145] 3. Latency

[0146] a) In the above multiple reference points, there is a path in the multipath information of each reference point. k Matching paths, the delays in the above matching paths are integrated to determine the delay

[0147] For example, in an electromagnetic map, the matching reference points are reference point l and reference point n. The terminal's map multipath information for reference point l Paths that match Delay in and multipath information of reference point n Matching paths Delay in The fusion result of the two is equal to the delay For example, one fusion method includes: and right and Weighted average.

[0148] b) In the multipath information of the above multiple reference points, the path k The delay of the matching paths is combined, or the delay in the local multipath information is used k For example, if the bandwidth of the measured signal is greater than the threshold, the delay k If the bandwidth of the measured signal is less than or equal to the threshold, the fusion result is used. Alternatively, if the time resolution of the measured signal is less than the threshold, the delay is used. k ; If the time resolution of the measured signal is greater than or equal to the threshold, the fused result is used.

[0149] This design, by correcting local multipath information based on the electromagnetic map, effectively leverages prior knowledge of the physical channel to improve channel data feedback and enhance performance. Furthermore, by calibrating the third multipath information (i.e., local multi-location information), it addresses latency issues resulting from limited bandwidth, low resolution, and inaccurate power estimation.

[0150] 2. The terminal determines the first mode according to the downlink channel information, the first multipath information and the second multipath information.

[0151] For example, the terminal determines a first reconstructed channel based on the first multipath information; the terminal determines a second reconstructed channel based on the second multipath information; and the terminal determines a first mode based on the similarity between the first and second reconstructed channels and the first channel corresponding to the downlink channel information. This can be described as follows: the first mode is determined based on the similarity between the first and second reconstructed channels and the first channel; wherein the first reconstructed channel is determined based on the first multipath information, the second reconstructed channel is determined based on the second multipath information, and the first channel is the channel corresponding to the downlink channel information. For example, the terminal determines the first channel based on a downlink reference signal. For example, if the downlink channel information includes third multipath information, the terminal can provide the third multipath information in the first channel, and the first channel can be referred to as a local channel. The local channel can be represented using the downlink channel matrix H, and therefore, the local channel can also be represented as local channel H.

[0152] Example 1: The first mode is determined according to similarities between the first reconstructed channel and the second reconstructed channel and the first channel and a threshold.

[0153] The threshold value may be preset (e.g., specified by a protocol) or configured for the terminal by the access network device. For example, the access network device sends threshold indication information to the terminal, and the terminal receives the threshold indication information from the access network device. It is understood that the terminal receiving the threshold indication information from the access network device can be replaced by obtaining the threshold indication information from the access network device. For example, the threshold value may include a first threshold value and / or a second threshold value.

[0154] In the following description, the third multipath information is referred to as local multipath information, the first multipath information is referred to as map multipath information, and the second multipath information is referred to as calibration multipath information. The first reconstructed channel is referred to as the map reconstructed channel. The second reconstructed channel is called the calibration reconstructed channel The first channel is called the local channel H.

[0155] As shown in Figure 7, the local multipath information is calibrated at the terminal to obtain the calibrated multipath information. Afterwards, the terminal uses the map multipath information and calibrate multipath information Reconstruct the channel and get the map reconstructed channel and calibrate the reconstructed channel There is no limitation on the channel reconstruction method. For example, a specific channel model can be used for channel reconstruction, such as using a cluster model to reconstruct the channel, or using an AI method to reconstruct the channel. For example, a reconstruction method satisfies:

[0156] Among them, a(AoA i ,AoD i ,power i ) represents the steering vector matrix, for example, when reconstructing the calibration reconstructed channel When the value can be the calibration multipath information Or, when reconstructing the map to reconstruct the channel Its value can be map multipath information The multipath information of one path in the

[0157] The terminal determines the map reconstruction channel and calibrate the reconstructed channel Similarity with the local channel H. The terminal reconstructs the channel based on the map and calibrate the reconstructed channel The first mode is determined based on the similarity with the local channel H and the threshold value. It can be understood that the terminal performs channel estimation on the downlink reference signal to determine a channel estimation result, which includes the local channel H.

[0158] For example, the terminal can use the cosine similarity g(·) function to measure the map reconstruction channel and calibrate the reconstructed channel and the similarity of the local channel H. For example, the map reconstruction channel The similarity with the local channel H is expressed as Calibrate the reconstructed channel The similarity with the local channel H is expressed as

[0159] In one possible implementation, as shown in FIG8 , when Greater than When , the reconstructed channel is calibrated It is more similar to the actual local channel H. When it is greater than the first threshold, the terminal determines that the first mode is equal to mode 2: feedback calibration multipath information (ie, second multipath information). When the value is less than or equal to the first threshold, the terminal determines that the first mode is equal to Mode 3: Regular Channel Feedback. For example, regular channel feedback may be CSI Type II. For example, in regular channel feedback, the terminal feeds back CSI information, or compressed CSI information, to the access network device. Regular channel feedback may be referred to as feeding back CSI-related information.

[0160] In another possible implementation, continuing to refer to FIG8 , when Less than or equal to When the map reconstructs the channel The similarity with the actual local channel H is higher. When the value is greater than the second threshold, the terminal determines that the first mode is equal to mode 1: feedback location information. When the value is less than or equal to the second threshold, the terminal determines that the first mode is equal to mode 3: normal channel feedback.

[0161] It is understandable that the values ​​of the first threshold and the second threshold may be equal or different, without limitation.

[0162] Example 2: The first mode is determined based on similarities between the first reconstructed channel, the second reconstructed channel, and the third reconstructed channel and the first channel, and the third reconstructed channel is a reconstructed channel corresponding to the CSI-related information.

[0163] In the following description, the third multipath information is referred to as local multipath information, the first multipath information is referred to as map multipath information, and the second multipath information is referred to as calibration multipath information. The first reconstructed channel is referred to as the map reconstructed channel. The second reconstructed channel is called the calibration reconstructed channel The third reconstructed channel is called the reconstructed channel H′ corresponding to the regular channel feedback, and the first channel is called the local channel H.

[0164] The terminal reconstructs the map and reconstructs the channel based on the map multipath information Reconstruct the calibration channel based on the calibration multipath information According to the CSI related information corresponding to the conventional channel feedback, the conventional channel feedback channel H' is reconstructed. The terminal determines the map reconstructed channel Calibrate the reconstructed channel The similarity between the conventional channel feedback channel H′ and the local channel H. For example, the cosine similarity g(·) can be used to measure the similarity between the two channels. The similarity with the local channel H is expressed as Calibrate the reconstructed channel The similarity with the local channel H is expressed as The similarity between the conventional channel feedback information H′ and the local channel H is denoted as g(H′,H).

[0165] In a possible implementation, the terminal determines the magnitude relationship of the above three similarities. When the value of is the largest, the terminal determines that the first mode is equal to mode 1: feedback location information. Or, when When the value of is the largest, the terminal determines that the first mode is equal to mode 2: feedback of calibrated multipath information. Alternatively, when the value of g(H′, H) is the largest, the terminal determines that the first mode is equal to mode 3: normal channel feedback.

[0166] 3. The terminal sends the first information to the access network device according to the first mode.

[0167] For example, when the first mode includes feedback location information (e.g., mode 1), the first information includes: location information, where the location information includes the location information of the terminal. For example, the geographic location information of the terminal, such as the longitude and latitude coordinates of the terminal, further includes the height coordinates of the terminal. Alternatively, the location information includes the location information of the reference point corresponding to the first multipath information, where the location information of the reference point can be an identifier or index of the reference point, or the coordinates of the reference point. The coordinates of the reference point can refer to the coordinates of the reference point in an electromagnetic map.

[0168] It is understood that when a terminal feeds location information to an access network device, the air interface overhead is lower than when feeding back CSI information or multipath information. Furthermore, because the access network device can recover the corresponding multipath information based on the fed-back location information, the feedback effect is equivalent. In other words, the terminal's feedback overhead can be reduced while maintaining the same or comparable feedback effect.

[0169] When the first mode includes feedback of the second multipath information, which is also called feedback of calibration multipath information (e.g., mode 2), the first information includes: the second multipath information. The second multipath information includes AOA and AOD. For example, the second multipath information includes paths, second multipath information Expressed as The terminal provides feedback to the access network equipment At this time, the first information fed back by the terminal to the access network device is expressed as

[0170] Furthermore, the second multipath information fed back by the terminal to the access network device also includes: power and / or delay. The delay, AOA and AOD of each path. At this time, the first information fed back by the terminal to the access network device is expressed as Alternatively, the terminal feeds back the power, AOA and AOD of M paths to the access network device. In this case, the first information fed back by the terminal to the access network device is represented as Alternatively, the terminal feeds back the power, delay, AOA and AOD of M paths to the access network device. In this case, the first information fed back by the terminal to the access network device is represented as Optionally, when the first mode includes feeding back the second multipath information, the terminal may further feed back location information to the access network device.

[0171] When the first mode includes feeding back CSI-related information, which is also called regular channel feedback (e.g., mode 3), the first information includes CSI-related information. For example, the terminal may compress the CSI information using a CSI Type II compression process, and the terminal feeds back the compressed CSI to the access network device.

[0172] Upon receiving the first information, the access network device may process the downlink data accordingly based on the first information. For example, the terminal reconstructs the downlink channel based on the first information. Reconstructing the downlink channel is also referred to as restoring the downlink channel matrix H. The terminal then performs precoding and other processing on the downlink data based on the reconstructed downlink channel. For example, when the first information includes second multipath information, the access network device processes the downlink data based on the second multipath information. It is understood that when the first information fed back by the terminal to the access network device includes the AOA and AOD in the second multipath information, the access network device may match a corresponding reference point in the electromagnetic map based on the AOA and AOD, and determine the power and delay corresponding to the second multipath information based on the multipath information corresponding to the reference point. Furthermore, the downlink data may be processed based on the power, delay, AOA, and AOD included in the second multipath information. Alternatively, when the first information includes location information, for example, when the location information includes the terminal's location information, the access network device may determine a matching reference point in the electromagnetic map based on the terminal's location information, and process the downlink data based on the multipath information corresponding to the reference point. Alternatively, when the first information includes CSI-related information, such as compressed CSI information, the access network device decompresses the compressed CSI information and processes the downlink data according to the decompressed CSI information.

[0173] In one possible implementation, before step 300, the process further includes: a pre-interaction process between the terminal and the access network device. The pre-interaction process can be initiated by the terminal or the access network device, without limitation. During the pre-interaction process, the terminal and the access network device can exchange the following information:

[0174] a) Activation indication based on channel feedback from electromagnetic maps.

[0175] For example, when electromagnetic map-based channel feedback is activated, for example, when the terminal receives an activation indication from the access network device, the terminal uses the method of the embodiment of the present application to feed back first information to the access network device.

[0176] b) Configuration of the electromagnetic map.

[0177] For example, the access network device may send electromagnetic map configuration parameters to the terminal, and the terminal may receive the electromagnetic map from the access network device based on the electromagnetic map configuration parameters. Alternatively, the access network device may configure or send the electromagnetic map to the terminal during the pre-interaction process, in which case the terminal and access network device will not perform step 310.

[0178] c) Configuration of transmission parameters. For example, the configuration of transmission parameters includes at least one of the following:

[0179] i. The access network device may configure the terminal to determine a threshold for the first mode, for example, the threshold includes a first threshold and / or a second threshold.

[0180] ii. Specific formats of terminal feedback multipath information and feedback location information.

[0181] iii. Matching rules and calibration rules for local multipath information and map multipath information, etc.

[0182] iv. Access network equipment and terminals may agree on algorithms, models, and calculation methods for channel estimation, multipath information calibration, and channel reconstruction.

[0183] v. The access network device and the terminal may agree on whether the terminal uses positioning configuration. For example, if the terminal uses positioning configuration, the terminal may obtain the terminal's location information, match reference points in the electromagnetic map based on the terminal's location information, and / or the terminal may feedback the terminal's location information to the access network device.

[0184] It is understandable that during the pre-interaction process, the access network device may use upper layer signaling such as radio resource control (RRC) to configure the above parameters for the terminal, or the access network device may use downlink control information (DCI) to dynamically indicate the above parameters to the terminal. For example, the access network device uses RRC or DCI to configure the above parameters for the terminal. At time t0, the terminal feeds back first information to the access network device according to the above configured parameters. Thereafter, the access network device dynamically indicates the update of the above parameters to the terminal through DCI. At time t1, the terminal feeds back first information to the access network device according to the above updated parameters.

[0185] Through the above design, the terminal integrates the electromagnetic map into the feedback of the downlink channel information. The terminal can determine the feedback information mode based on the similarity between the reconstructed channel and the local channel H, thereby improving compression efficiency while maintaining good communication performance.

[0186] It is understood that in the embodiments of the present application:

[0187] 1. Within each process, the order of the different steps is not limited. For example, step 300 can be executed before step 310, or vice versa. That is, the terminal can first receive the electromagnetic map from the access network device, and then receive the downlink reference signal from the access network device. Furthermore, each process may include fewer or more steps than those shown in the flowchart or text description.

[0188] 2. In the embodiments of the present application, "(e.g., a terminal) receives information from (e.g., an access network device)" can be understood to mean that the source of the information is the access network device and the destination is the terminal, which may include the terminal directly or indirectly receiving information from the access network device. The information may undergo necessary processing between the source and destination, such as format changes, but the destination can still understand the valid information from the source. Similar expressions in this application should be understood similarly and will not be repeated here.

[0189] In the embodiments provided above, the methods provided in the embodiments of the present application are described from the perspective of the interaction between the terminal and the access network device. In order to implement the various functions in the methods provided in the embodiments of the present application, the terminal or access network device, etc., may include a hardware structure and / or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a certain function of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the design constraints of the specific application of the technical solution.

[0190] Figures 9 and 10 are schematic diagrams of the structures of possible communication devices provided in embodiments of the present application. These communication devices can implement one or more corresponding functions in the above-mentioned method embodiments. For example, the functions implemented by the first communication device or the second communication device, etc., may thus achieve the beneficial effects possessed by the above-mentioned method embodiments. In embodiments of the present application, the communication device may be a terminal or an access network device, or the communication device may be a module (such as a chip) applied to a terminal or an access network device.

[0191] As shown in Figure 9, a communication device 900 includes a processing unit 910 and a transceiver unit 920. The communication device 900 is used to implement the functions of the terminal or access network device in the method embodiment of Figure 3 above.

[0192] Optionally, the transceiver unit 920 may also be referred to as an output unit, an interface unit, or a communication unit. In one possible implementation, the transceiver unit 920 includes at least one of a transmitting unit and a receiving unit. The transmitting unit and the receiving unit may be integrated together or may be two independent units.

[0193] When the communication device 900 is used to implement the functions of the terminal in Figure 3, specifically: the transceiver unit 920 is used to obtain a downlink reference signal, and the downlink reference signal is used to determine downlink channel information; the transceiver unit 920 is also used to obtain an electromagnetic map, and the electromagnetic map includes first multipath information; the processing unit 910 is used to generate first information; the transceiver unit 920 is also used to feedback first information to the second communication device, where the first information is associated with a first mode in which the first communication device feeds back downlink channel information to the second communication device, and the first mode is determined based on the downlink channel information and the first multipath information.

[0194] In one possible implementation, the first information includes: second multipath information and / or location information, where the second multipath information is obtained by calibrating the downlink channel information based on the first multipath information, and the location information includes location information of the first communication device, or location information of a reference point corresponding to the first multipath information.

[0195] In a possible implementation, the second multipath information includes an arrival angle and a departure angle, and the arrival angle and the departure angle are determined according to the downlink channel information.

[0196] In a possible implementation, the second multipath information further includes power and / or delay, the power is determined according to the first multipath information, and the delay is determined according to the first multipath information or the downlink channel information.

[0197] In a possible implementation manner, the first mode includes feeding back the second multipath information.

[0198] In a possible implementation manner, the first mode includes feeding back position information.

[0199] In a possible implementation manner, the first information includes channel state information (CSI) related information.

[0200] In a possible implementation, the first mode includes feeding back CSI-related information.

[0201] In a possible implementation, the transceiver unit 920 is further configured to obtain threshold indication information from the second communication device.

[0202] In a possible implementation, the first mode is determined according to the downlink channel information and the first multipath information, including: the first mode is determined according to the downlink channel information, the first multipath information, and the second multipath information.

[0203] In a possible implementation, the first mode is determined according to the downlink channel information, the first multipath information, and the second multipath information, including: the first mode is determined according to similarities between the first reconstructed channel and the second reconstructed channel and the first channel;

[0204] The first reconstructed channel is determined according to the first multipath information, the second reconstructed channel is determined according to the second multipath information, and the first channel is a channel corresponding to the downlink channel information.

[0205] In a possible implementation, the first mode is determined based on similarity between the first reconstructed channel and the second reconstructed channel and the first channel, including: the first mode is determined based on similarity between the first reconstructed channel and the second reconstructed channel and the first channel and a threshold.

[0206] In one possible implementation, the first mode is determined based on the similarity between the first reconstructed channel, the second reconstructed channel and the first channel, including: the first mode is determined based on the similarity between the first reconstructed channel, the second reconstructed channel and the third reconstructed channel and the first channel, and the third reconstructed channel is the reconstructed channel corresponding to the CSI-related information.

[0207] In a possible implementation manner, the reference point corresponding to the first multipath information matches the downlink channel information, or the reference point corresponding to the first multipath information matches the location information of the first communication device.

[0208] In a possible implementation manner, the downlink channel information includes third multipath information, and the third multipath information is determined according to a channel estimation result of the downlink reference signal.

[0209] When the communication device 900 is used to implement the functions of the access network device in Figure 3, specifically: the processing unit 910 is used to generate a downlink reference signal; the transceiver unit 920 is used to send the downlink reference signal to the first communication device, where the downlink reference signal is used to determine downlink channel information; the transceiver unit 920 is also used to send an electromagnetic map to the first communication device, where the electromagnetic map includes first multipath information; the transceiver unit 920 is also used to receive first information from the first communication device, where the first information is associated with a first mode in which the first communication device feeds back downlink channel information to the second communication device, where the first mode is determined based on the downlink channel information and the first multipath information.

[0210] In one possible implementation, the first information includes: second multipath information and / or location information, where the second multipath information is obtained by calibrating the downlink channel information based on the first multipath information, and the location information includes location information of the first communication device, or location information of a reference point corresponding to the first multipath information.

[0211] In a possible implementation, the second multipath information includes an arrival angle and a departure angle, and the arrival angle and the departure angle are determined according to the downlink channel information.

[0212] In a possible implementation, the second multipath information further includes power and / or delay, the power is determined according to the first multipath information, and the delay is determined according to the first multipath information or the downlink channel information.

[0213] In a possible implementation manner, the first mode includes feeding back the second multipath information.

[0214] In a possible implementation manner, the first mode includes feeding back position information.

[0215] In a possible implementation manner, the first information includes channel state information (CSI) related information.

[0216] In a possible implementation, the first mode includes feeding back CSI-related information.

[0217] In a possible implementation manner, the transceiver unit 920 is further configured to: send threshold indication information to the first communication device.

[0218] In a possible implementation, the first mode is determined according to the downlink channel information and the first multipath information, including: the first mode is determined according to the downlink channel information, the first multipath information, and the second multipath information.

[0219] In a possible implementation, the first mode is determined according to the downlink channel information, the first multipath information, and the second multipath information, including: the first mode is determined according to similarities between the first reconstructed channel and the second reconstructed channel and the first channel;

[0220] The first reconstructed channel is determined according to the first multipath information, the second reconstructed channel is determined according to the second multipath information, and the first channel is a channel corresponding to the downlink channel information.

[0221] In a possible implementation, the first mode is determined based on similarity between the first reconstructed channel and the second reconstructed channel and the first channel, including: the first mode is determined based on similarity between the first reconstructed channel and the second reconstructed channel and the first channel and a threshold.

[0222] In one possible implementation, the first mode is determined based on the similarity between the first reconstructed channel, the second reconstructed channel and the first channel, including: the first mode is determined based on the similarity between the first reconstructed channel, the second reconstructed channel and the third reconstructed channel and the first channel, and the third reconstructed channel is the reconstructed channel corresponding to the CSI-related information.

[0223] In a possible implementation manner, the reference point corresponding to the first multipath information matches the downlink channel information, or the reference point corresponding to the first multipath information matches the location information of the first communication device.

[0224] In a possible implementation manner, the downlink channel information includes third multipath information, and the third multipath information is determined according to a channel estimation result of the downlink reference signal.

[0225] For a more detailed description of the processing unit 910 and the transceiver unit 920, reference may be made to the description in FIG3 of the above method embodiment, which will not be repeated here.

[0226] In one possible implementation, when the access network device adopts the O-RAN architecture, the processing unit 910 may be located on the O-CU entity, and the transceiver unit 920 may be located on the O-DU or O-RU entity. Optionally, when the O-CU entity includes an O-CU-CP entity and an O-CU-UP entity, the processing unit 910 may be located on the O-CU-CP entity or the O-CU-UP entity. Alternatively, the processing unit 910 is located on the O-DU entity, and the transceiver unit 920 is located on the O-RU entity. Alternatively, both the processing unit 910 and the transceiver unit 920 are located on the O-DU entity or the O-RU entity, etc., without limitation.

[0227] It is understood that the division of units in the embodiments of the present application is schematic and is only a logical functional division. In actual implementation, there may be other division methods. In addition, the various functional units in the embodiments of the present application can be integrated into a physical device (for example, a processor), or each functional unit can be a separate physical device, or two or more units can be integrated into a unit for implementation. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional modules.

[0228] As shown in Figure 10, the communication device 1000 includes a processing circuit 1010 and an interface circuit 1020. The processing circuit 1010 and the interface circuit 1020 are coupled to each other. It is understood that the processing circuit 1010 may be a processor, and the interface circuit 1020 may be a transceiver or an input / output interface.

[0229] Optionally, the communication device 1000 may further include a memory 1030 for storing instructions executed by the processing circuit 1010 or storing input data required for the processing circuit 1010 to run instructions or storing data generated after the processing circuit 1010 runs instructions.

[0230] Optionally, the memory (eg, 1030 ) in the embodiment of the present application may be integrated into the processing circuit (eg, 1010 ), or the memory (eg, 1030 ) and the processing circuit (eg, 1010 ) may be provided separately.

[0231] When the communication device 1000 is used to implement the method shown in FIG. 3 , the processing circuit 1010 is used to implement the functions of the processing unit 910 , and the interface circuit 1020 is used to implement the functions of the transceiver unit 920 .

[0232] When the communication device is a chip used in a terminal, the chip implements the terminal functions described in the method embodiments. The chip receives information sent by the access network device to the terminal through other modules in the terminal (such as a radio frequency module or antenna); alternatively, the chip sends information to other modules in the terminal (such as a radio frequency module or antenna), and the information is sent by the terminal to the access network device.

[0233] When the above-mentioned communication device is a module applied to an access network device, the module implements the functions of the access network device in the above-mentioned method embodiments. The module receives information from other modules in the access network device (such as a radio frequency module or antenna), and the information is sent by the terminal to the access network device; or the module sends information to other modules in the access network device (such as a radio frequency module or antenna), and the information is sent by the access network device to the terminal.

[0234] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0235] The memory in the embodiments of the present application can be a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known in the art.

[0236] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC.

[0237] The embodiment of the present application further provides a communication device, which includes a processor and a memory, wherein the processor is configured to implement the functions of the access network device or terminal in FIG3. For example, the processor is configured to execute a computer program or instruction stored in the memory, wherein the memory is configured to store the computer program or instruction. When the computer program or instruction is executed, the method of the access network device or terminal in FIG3 is executed. Optionally, the processor and the memory are coupled.

[0238] An embodiment of the present application also provides a communication device, including a processor, which is used to implement the functions of the access network device or terminal in Figure 3.

[0239] The present application also provides a computer-readable storage medium storing instructions, which may also be referred to as computer programs, computer program codes, etc. The instructions are executed on a computer, causing the computer to perform the functions of the access network device or terminal in FIG. 3 of the above method embodiment.

[0240] An embodiment of the present application also provides a computer program product, including a computer program or instructions, wherein the computer program product includes a computer program or instructions for executing the method of the terminal in Figure 3, or the computer program product includes a computer program or instructions for executing the method of the access network device in Figure 3.

[0241] An embodiment of the present application also provides a chip, which includes a processor coupled to a memory, and the processor is used to execute computer programs or instructions stored in the memory, so that the functions of the access network device or terminal in Figure 3 are implemented.

[0242] The embodiment of the present application further provides a communication system, including a first communication device and a second communication device. The first communication device is used to implement the function of the terminal in FIG3 , and the second communication device is used to implement the function of the access network device in FIG3 .

[0243] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0244] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

Claims

1. A method for feedback information, characterized in that The method is applied to a first communication device and includes: Obtaining a downlink reference signal for determining downlink channel information; Obtaining an electromagnetic map including first multipath information; Feeding back first information to a second communication device, where the first information is associated with a first mode in which the first communication device feeds back downlink channel information to the second communication device, and the first mode is determined according to the downlink channel information and the first multipath information.

2. The method according to claim 1, characterized in that, The first information includes: second multipath information and / or location information. The second multipath information is obtained by calibrating the downlink channel information based on the first multipath information. The location information includes the location information of the first communication device or the location information of a reference point corresponding to the first multipath information.

3. The method according to claim 2, characterized in that The second multipath information includes an angle of arrival and an angle of departure, which are determined according to the downlink channel information.

4. The method according to claim 3, wherein The second multipath information further includes power and / or delay. The power is determined according to the first multipath information, and the delay is determined according to the first multipath information or the downlink channel information.

5. The method according to any one of claims 2 to 4, characterized in that The first mode includes feeding back the second multipath information.

6. The method according to any one of claims 2 to 4, characterized in that, The first mode includes feeding back location information.

7. The method according to claim 1, wherein The first information includes information related to channel state information (CSI).

8. The method according to claim 7, wherein The first mode includes feeding back CSI-related information.

9. The method according to any one of claims 1 to 8, characterized in that, It further includes: Obtaining indication information of a threshold from the second communication device.

10. The method according to any one of claims 1 to 9, characterized in that, The first mode is determined according to the downlink channel information and the first multipath information, and includes: the first mode is determined according to the downlink channel information, the first multipath information, and the second multipath information.

11. The method according to claim 10, wherein The first mode is determined according to the downlink channel information, the first multipath information, and the second multipath information, and includes: The first mode is determined according to the similarity between a first reconstructed channel and a second reconstructed channel and a first channel; wherein the first reconstructed channel is determined according to the first multipath information, the second reconstructed channel is determined according to the second multipath information, and the first channel is the channel corresponding to the downlink channel information.

12. The method according to claim 11, wherein The first mode is determined according to the similarity between a first reconstructed channel and a second reconstructed channel and a first channel, and includes: the first mode is determined according to the similarity between the first reconstructed channel and the second reconstructed channel and the first channel and a threshold.

13. The method according to claim 11, wherein The first mode is determined according to the similarity between a first reconstructed channel and a second reconstructed channel and a first channel, and includes: the first mode is determined according to the similarity between the first reconstructed channel, the second reconstructed channel, and a third reconstructed channel and the first channel, and the third reconstructed channel is the reconstructed channel corresponding to the CSI-related information.

14. The method according to any one of claims 1 to 13, characterized in that, The reference point corresponding to the first multipath information matches the downlink channel information, or the reference point corresponding to the first multipath information matches the location information of the first communication device.

15. The method according to any one of claims 1 to 14, characterized in that, The downlink channel information includes third multipath information, which is determined according to the channel estimation result of the downlink reference signal.

16. A method for feedback information, characterized in that, The method is applied to a second communication device and includes: Send a downlink reference signal to the first communication device, where the downlink reference signal is used to determine downlink channel information; Send an electromagnetic map to the first communication device, where the electromagnetic map includes first multipath information; Receive first information from the first communication device, where the first information is associated with a first mode in which the first communication device feeds back downlink channel information to the second communication device, and the first mode is determined according to the downlink channel information and the first multipath information.

17. The method according to claim 16, wherein The first information includes: second multipath information and / or location information, where the second multipath information is obtained by calibrating the downlink channel information according to the first multipath information, and the location information includes the location information of the first communication device or the location information of a reference point corresponding to the first multipath information.

18. The method according to claim 17, wherein The second multipath information includes an angle of arrival and an angle of departure, where the angle of arrival and the angle of departure are determined according to the downlink channel information.

19. The method according to claim 18, wherein The second multipath information further includes power and / or delay, where the power is determined according to the first multipath information, and the delay is determined according to the first multipath information or the downlink channel information.

20. The method according to any one of claims 17 to 19, characterized in that The first mode includes feeding back the second multipath information.

21. The method according to any one of claims 17 to 19, characterized in that, The first mode includes feeding back location information.

22. The method according to claim 16, wherein The first information includes channel state information (CSI) related information.

23. The method according to claim 22, wherein The first mode includes feeding back CSI related information.

24. The method according to any one of claims 16 to 23, characterized in that, Further includes: Send indication information of a threshold to the first communication device.

25. The method according to any one of claims 16 to 24, characterized in that, The first mode is determined according to the downlink channel information and the first multipath information, including: the first mode is determined according to the downlink channel information, the first multipath information, and the second multipath information.

26. The method according to claim 25, wherein The first mode is determined according to the downlink channel information, the first multipath information, and the second multipath information, including: The first mode is determined according to the similarity between a first reconstructed channel and a second reconstructed channel and a first channel; Wherein, the first reconstructed channel is determined according to the first multipath information, the second reconstructed channel is determined according to the second multipath information, and the first channel is the channel corresponding to the downlink channel information.

27. The method according to claim 26, wherein The first mode is determined according to the similarity between a first reconstructed channel and a second reconstructed channel and a first channel, including: the first mode is determined according to the similarity between the first reconstructed channel and the second reconstructed channel and the first channel and a threshold.

28. The method according to claim 26, wherein The first mode is determined according to the similarity between a first reconstructed channel and a second reconstructed channel and a first channel, including: the first mode is determined according to the similarity between the first reconstructed channel, the second reconstructed channel, and a third reconstructed channel and the first channel, where the third reconstructed channel is the reconstructed channel corresponding to the CSI related information.

29. The method according to any one of claims 16 to 28, characterized in that, The reference point corresponding to the first multipath information matches the downlink channel information, or the reference point corresponding to the first multipath information matches the location information of the first communication device.

30. The method according to any one of claims 16 to 29, characterized in that The downlink channel information includes third multipath information, where the third multipath information is determined according to the channel estimation result of the downlink reference signal.

31. A communication device, characterized in that, Includes: A processor for executing a computer program or instructions stored in a memory, The memory for storing the computer program or the instructions, When the computer program or the instructions are running, such that the method according to any one of claims 1 to 15 is executed, or such that the method according to any one of claims 16 to 30 is executed.

32. A computer-readable storage medium, characterized in that, Instructions are stored on the computer-readable storage medium, and the instructions are run on a computer such that the computer executes the method according to any one of claims 1 to 15, or the method according to any one of claims 16 to 30.

33. A computer program product, characterized in that, The computer program product includes a computer program or instructions for executing the method according to any one of claims 1 to 15, or the computer program product includes a computer program or instructions for executing the method according to any one of claims 16 to 30.

34. A communication system, characterized in that, Comprising: A first communication device for executing the method according to any one of claims 1 to 15; A second communication device for executing the method according to any one of claims 16 to 30.

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