Channel feedback method and apparatus, terminal, and network side device

Abstract

The present application relates to the technical field of communications, and discloses a channel feedback method and apparatus, a terminal, and a network side device. The channel feedback method of embodiments of the present application comprises: a terminal receives first information from a network side device, the first information being determined on the basis of at least part of second information obtained by means of uplink channel measurement; the terminal executes downlink channel measurement on the basis of the first information, to obtain first channel feedback information; and the terminal sends second channel feedback information to the network side device, the second channel feedback information being determined on the basis of at least part of the first channel feedback information; wherein the second information comprises a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, and the first multipath parameter is a multipath parameter of an uplink channel.

Description

Channel feedback method, device, terminal and network side equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202310926232.9 filed on July 26, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of communication technology, and specifically relates to a channel feedback method, apparatus, terminal, and network-side equipment. Background Art

[0004] With the advancement of communication technology, the antenna arrays of network-side devices have grown in size, and wireless channels exhibit spherical wave propagation and spatial non-stationarity. Spherical wave propagation can easily degrade the performance of far-field codebook shaping based on discrete Fourier transform (DFT) vectors. Therefore, how to provide feedback on non-stationary channel information has become an urgent issue.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a channel feedback method, apparatus, terminal, and network-side equipment, which can solve the problem of non-stationary channel information feedback.

[0007] In a first aspect, a channel feedback method is provided, comprising:

[0008] The terminal receives first information from a network-side device, where the first information is determined based on at least part of the second information obtained by uplink channel measurement;

[0009] The terminal performs downlink channel measurement based on the first information to obtain first channel feedback information;

[0010] The terminal sends second channel feedback information to the network side device, where the second channel feedback information is determined based on at least part of the first channel feedback information;

[0011] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0012] In a second aspect, a channel feedback method is provided, comprising:

[0013] The network side device performs uplink channel measurement to obtain second information;

[0014] The network side device sends first information to the terminal, where the first information is determined based on at least part of the second information, and the first information is used to perform downlink channel measurement;

[0015] The network-side device receives second channel feedback information from the terminal, where the second channel feedback information is determined based on at least part of the first channel feedback information obtained by the downlink channel measurement;

[0016] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0017] According to a third aspect, a channel feedback device is provided, comprising:

[0018] A first receiving module is configured to receive first information from a network-side device, where the first information is determined based on at least part of the second information obtained by uplink channel measurement; and perform downlink channel measurement based on the first information to obtain first channel feedback information;

[0019] A first sending module is configured to send second channel feedback information to a network-side device, where the second channel feedback information is determined based on at least part of the first channel feedback information;

[0020] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0021] In a fourth aspect, a channel feedback device is provided, comprising:

[0022] A second receiving module, configured to perform uplink channel measurement to obtain second information;

[0023] a second sending module, configured to send first information to the terminal, where the first information is determined based on at least part of the second information, and the first information is used to perform downlink channel measurement;

[0024] The second receiving module is further configured to receive second channel feedback information from the terminal, where the second channel feedback information is determined based on at least part of the first channel feedback information obtained by the downlink channel measurement;

[0025] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0026] In a fifth aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0027] According to a sixth aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is configured to receive first information from a network-side device, the first information being determined based on at least part of second information obtained through uplink channel measurement; perform downlink channel measurement based on the first information to obtain first channel feedback information; and send second channel feedback information to the network-side device, the second channel feedback information being determined based on at least part of the first channel feedback information.

[0028] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0029] In the seventh aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0030] In an eighth aspect, a network-side device is provided, including a processor and a communication interface, wherein the communication interface is configured to perform uplink channel measurement to obtain second information; send first information to a terminal, the first information being determined based on at least part of the second information, and the first information being used to perform downlink channel measurement; and receive second channel feedback information from the terminal, the second channel feedback information being determined based on at least part of the first channel feedback information obtained through the downlink channel measurement.

[0031] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0032] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0033] In the tenth aspect, a wireless communication system is provided, comprising: a terminal and a network side device, wherein the terminal can be used to execute the steps of the method described in the first aspect, and the network side device can be used to execute the steps of the method described in the second aspect.

[0034] In the eleventh aspect, a chip is provided, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0035] In the twelfth aspect, a computer program / program product is provided, which is stored in a storage medium and executed by at least one processor to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0036] In an embodiment of the present application, a terminal receives first information from a network-side device, and the first information is determined based on at least part of the second information obtained by uplink channel measurement; the terminal performs downlink channel measurement based on the first information to obtain first channel feedback information; the terminal sends second channel feedback information to the network-side device, and the second channel feedback information is determined based on at least part of the first channel feedback information; wherein the second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and the subarray on the network device side, and the first multipath parameter is the multipath parameter of the uplink channel. In this way, downlink channel estimation can be performed in units of subarrays of network-side devices, and channel information feedback can be performed, thereby improving the accuracy of downlink channel estimation. At the same time, there is no need to perform downlink channel measurement and reporting for the far field and near field separately, thereby reducing the downlink channel pilot overhead of the network-side device and the channel feedback overhead of the terminal side. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a block diagram of a wireless communication system to which embodiments of the present application may be applied;

[0038] Figure 2 is a schematic diagram of the propagation of near-field spherical waves and far-field plane waves;

[0039] Figure 3 is a schematic diagram of spatial non-stationarity;

[0040] FIG4 is a flow chart of a channel feedback method provided in an embodiment of the present application;

[0041] FIG5 is a flow chart of another channel feedback method provided in an embodiment of the present application;

[0042] FIG6 is a schematic structural diagram of a channel feedback device provided in an embodiment of the present application;

[0043] FIG7 is a schematic structural diagram of another channel feedback device provided in an embodiment of the present application;

[0044] FIG8 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0045] FIG9 is a schematic structural diagram of a terminal provided in an embodiment of the present application;

[0046] FIG10 is a schematic structural diagram of a network-side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0048] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0049] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0050] FIG1 is a block diagram of a wireless communication system applicable to an embodiment of the present application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), an aircraft (Flight Vehicle), a vehicle-mounted device (VUE), a ship-mounted device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), a game console, a personal computer (PC), an ATM, or a self-service machine, or other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AS) or a wireless fidelity (WiFi) node, etc.Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B (home evolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0051] The core network equipment may include but is not limited to at least one of the following: core network node, core network function, mobility management entity (MME), access mobility management function (AMF), session management function (SMF), user plane function (UPF), policy control function (PCF), policy and charging rules function unit (PCRF), edge application service discovery function (EASDF), unified data management (UDM), unified data repository (UDR), home user server (HSS), centralized network configuration (CNC), network storage function (NRF), network exposure function (NEF), local NEF (L-NEF), binding support function (BSF), application function ( It should be noted that in the embodiments of the present application, only the core network device in the NR system is introduced as an example, and the specific type of the core network device is not limited.

[0052] For ease of understanding, some of the contents involved in the embodiments of this application are described below:

[0053] 1. Spherical wave propagation and spatial non-stationarity.

[0054] In 5G NR systems, user equipment (UE) is assumed to always be in the far field of the base station. In this case, the signal propagation between the base station and the UE can be approximately modeled using a plane wave model. As shown in Figure 2, in the plane wave model, the propagation paths between the base station's antennas and the UE or reflector (or scatterer) are parallel. Therefore, the phase difference between the propagation paths between each antenna and the UE / reflector (or scatterer) is determined only by the antenna array geometry. Based on the plane wave model, the base station's beam angle can be controlled by controlling the phase difference between the base station's antennas.

[0055] In the near field, the propagation paths between the base station's antennas and the UE or reflectors (or scatterers) can no longer be considered parallel and need to be modeled using spherical waves. There are several differences between near-field communication and far-field communication.

[0056] First, the phase of the received signal varies nonlinearly across the array. In the far field, the phase of the array's steering vector scales approximately linearly with each element, making the mathematical analysis tractable. However, this property does not hold in the near field.

[0057] Second, as the array aperture increases, the amplitude or path loss variation across the array needs to be considered. This is because the distance between a user and the center of the array may be very different from the distance between a user and the edge of the array.

[0058] Third, in the near field, the tilt angle of the incident wave varies greatly from the center to the edge of the array, which causes the effective projected aperture of different antennas on the array to change.

[0059] Another change faced by users in the near-field area is channel non-stationarity. This is because, due to the large array size, antenna elements in different areas of the array experience different propagation environments, resulting in spatially non-stationary characteristics of the channel. For a large-scale antenna array, signals reflected (or scattered) by certain reflectors (or scatterers) in the environment can only be received by antennas within a certain local area of ​​the array. Conversely, only signals transmitted by antennas within a certain local area of ​​the array can be reflected (or scattered) by certain reflectors (or scatterers) in the environment. Correspondingly, this local area is called the visible area (of the multipath on the array). As shown in Figure 3, the visible area of ​​"far-field cluster 1" is "visible area 1," and the visible area of ​​"near-field cluster 1" is "visible area 2." It should be noted that, for clarity, Figure 3 only depicts clusters whose visible area (or length) is smaller than the entire base station (BS) array. In real environments, reflectors (or scatterers) may have visible areas that cover the entire array.

[0060] 2. Network energy saving.

[0061] Technical Background of Airspace Energy Saving: Massive Multiple-Input Multiple-Output (MIMO) consumes more energy due to the large number of antennas and corresponding RF components. Traditional base station energy conservation measures primarily rely on on-site power-off, time-controlled switching, and cell blocking. However, these methods are relatively crude and fail to address user experience. In the 5G era, 5G base stations utilize large-scale 64T64R array antennas, supporting greater bandwidth and other factors, resulting in higher energy consumption than 4G base stations. Furthermore, due to the high frequency band and the limited coverage range of a single station, 5G base station deployments will require two to three times the scale of 4G base stations to achieve the same coverage as 4G networks. The higher power consumption of equipment and the greater number of sites inevitably lead to even greater power consumption. Excessive power consumption in 5G has become a pain point for current network operations.

[0062] Base station energy conservation can be categorized by implementation principles, including symbol shutdown, carrier shutdown, channel shutdown, and deep sleep technologies. When the number of UEs in a cell is small, the capacity and coverage gains achieved by massive MIMO can be redundant. In this case, the network can disable some Transceiver Units (TXRUs) to achieve network energy conservation. The TXRUs corresponding to some antenna elements can be disabled to serve a small number of users. This reduces beam coverage and increases beamwidth.

[0063] 3. Synaesthesia integration.

[0064] Wireless communications and radar sensing (Communication & Sensing, C&S) have been developing in parallel, but with limited overlap. They share many commonalities in signal processing algorithms, equipment, and, to a certain extent, system architecture. In recent years, traditional radar has been moving towards the more general wireless sensing direction. Wireless sensing can broadly refer to retrieving information from received radio signals. For wireless sensing related to sensing target location, common signal processing methods can be used to estimate dynamic parameters such as target signal reflection delay, arrival angle, departure angle, and Doppler. For sensing target physical characteristics, this can be achieved by measuring the inherent signal patterns of devices / objects / activities. The two sensing methods can be referred to as perception parameter estimation and pattern recognition, respectively. In this sense, wireless sensing refers to more general sensing technologies and applications using radio signals.

[0065] Integrated Sensing and Communication (ISAC) has the potential to integrate wireless sensing into mobile networks, referred to here as Perceptive Mobile Networks (PMNs). Perceptive Mobile Networks can provide both communication and wireless sensing services and, due to their wide broadband coverage and robust infrastructure, are poised to become a ubiquitous wireless sensing solution. Perceptive Mobile Networks can be widely used for communication and sensing in transportation, communications, energy, precision agriculture, and security. They can also provide complementary sensing capabilities to existing sensor networks, with unique day and night operation capabilities and the ability to penetrate fog, foliage, and even solid objects.

[0066] The channel feedback method provided in the embodiments of the present application is described in detail below through some embodiments and their application scenarios in conjunction with the accompanying drawings.

[0067] 4 , an embodiment of the present application provides a channel feedback method. As shown in FIG4 , the channel feedback method includes:

[0068] Step 401: The terminal receives first information from a network-side device, where the first information is determined based on at least part of second information obtained by uplink channel measurement.

[0069] Step 402: The terminal performs downlink channel measurement based on the first information to obtain first channel feedback information;

[0070] Step 403: The terminal sends second channel feedback information to the network side device, where the second channel feedback information is determined based on at least part of the first channel feedback information;

[0071] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0072] In an embodiment of the present application, the subarray of the above-mentioned network-side device is a subarray pre-demarcated by the network-side device on the overall array, and is used to represent the visible area of ​​the network-side device. The number of antenna ports in the subarray can be greater than or equal to 1, and the number of antenna array elements in the subarray can be greater than or equal to 1. Among them, the visible area of ​​the network-side device includes the visible area to the terminal and the visible area to the reflector (or scatterer) in the environment. For the terminal, its visible area is the antenna area where there is a direct path between the network-side device and the terminal; for the reflector (or scatterer) in the environment, its visible area is the antenna area including the reflection path (or scattering path) of the reflector (or scatterer) in all signal propagation paths between the network-side device and the terminal.

[0073] It should be understood that after performing uplink channel measurement, the network-side device can obtain a mapping relationship between the first multipath parameter and the subarray on the network-side device. Based on the mutual difference between the uplink channel and the downlink channel, the terminal can perform downlink channel measurement based on the first information sent by the network-side device. In this way, downlink channel estimation can be performed on a per-subarray basis of the network-side device, and channel information feedback can be provided, thereby improving the accuracy of downlink channel estimation.

[0074] Optionally, the first information may be understood to include at least part of the multipath parameters in the first multipath parameters and a mapping relationship between the at least part of the multipath parameters and the subarray on the network device side.

[0075] In an embodiment of the present application, a terminal receives first information from a network-side device, the first information being determined based on at least part of second information obtained through uplink channel measurement; the terminal performs downlink channel measurement based on the first information to obtain first channel feedback information; the terminal sends second channel feedback information to the network-side device, the second channel feedback information being determined based on at least part of the first channel feedback information; wherein the second information includes at least one of a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, the first multipath parameter being a multipath parameter of the uplink channel. This allows downlink channel estimation and channel information feedback to be performed on a per-subarray basis, thereby improving the accuracy of downlink channel estimation. At the same time, there is no need to perform downlink channel measurement and reporting separately for the far field and near field, thereby reducing downlink channel pilot overhead of the network-side device and channel feedback overhead on the terminal side.

[0076] Optionally, in some embodiments, the terminal performing downlink channel measurement based on the first information, and obtaining the first channel feedback information includes:

[0077] The terminal performs downlink channel measurement based on the first information and third information sent by the network side device;

[0078] The terminal determines first channel feedback information according to at least one of the first information and the third information and a measurement result of the downlink channel measurement;

[0079] The third information includes at least one of the following:

[0080] The network side device is used to obtain array configuration information of the second information;

[0081] Signal configuration information for downlink channel measurement;

[0082] Location information of network-side devices;

[0083] Physical antenna array information of network-side devices.

[0084] In an embodiment of the present application, the above-mentioned array configuration information may include at least one of the following: antenna configuration information, the number of sub-array antenna elements, the sub-array element spacing, the sub-array antenna element index (for example, including: antenna element indexes at specified positions such as edge, end, and center), and sub-array formation information (for example, indicating that the sub-array is at least one of a linear array, a rectangular array, a circular array, and a cylindrical array).

[0085] The above-mentioned signal configuration information includes array configuration information for downlink channel measurement, and the array configuration information for downlink channel measurement includes at least one of the following: antenna configuration information, the number of subarray antenna elements, the subarray element spacing, the subarray antenna element index (for example, including: antenna element indexes at specified positions such as edge, end, and center), and subarray formation information (for example, indicating that the subarray is at least one of a linear array, a rectangular array, a circular array, and a cylindrical array).

[0086] The above-mentioned physical antenna array information may include at least one of antenna panel orientation, array type, number of antennas (including horizontal and vertical directions), array aperture, antenna polarization characteristics, array element gain and directivity characteristics.

[0087] Optionally, the network side device sends at least one of the first information and the third information to the terminal, specifically, it can be carried in a physical broadcast channel (PBCH) or a system information block (SIB) in a broadcast or multicast manner, or it can be carried in a radio resource control (RRC) or downlink control information (DCI) in a unicast manner. Or a combination of the two, using a broadcast message to indicate a part of the public information and using a unicast message to indicate another part of the receiving device specified (User-specified) information.

[0088] Optionally, in some embodiments, the first channel feedback information includes at least one of fourth information and fifth information;

[0089] The fourth information is feedback information associated with communication, and the fifth information is feedback information associated with perception.

[0090] In an embodiment of the present application, the fourth information can be understood as downlink channel information, which is mainly for downlink communication; the fifth information can be understood as perception information, which is mainly for perception and can also assist in channel estimation of communication.

[0091] Optionally, the fourth information includes at least one of the following:

[0092] Complex amplitude of downlink channel multipath;

[0093] a mapping relationship between the complex amplitude of the downlink channel multipath and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0094] a mapping relationship between the complex amplitude of the downlink channel multipath and at least one item of the third information;

[0095] a first vector and a mapping relationship between the first vector and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0096] a second vector and a mapping relationship between the second vector and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0097] A downlink channel estimation matrix and a mapping relationship between the downlink channel estimation matrix and at least one of a subarray of the network-side device or signal configuration information for downlink channel measurement;

[0098] A covariance matrix of a downlink channel estimation matrix and a mapping relationship between the covariance matrix and at least one of a subarray of the network-side device or signal configuration information for downlink channel measurement;

[0099] A correlation matrix of a downlink channel estimation matrix and a mapping relationship between the correlation matrix and at least one of the subarrays of the network side device or signal configuration information for downlink channel measurement.

[0100] Optionally, the signal configuration information is associated with a subarray of network-side devices, that is, the subarray of network-side devices associated with the target information can be determined based on the association between the target information and the signal configuration information. The target information includes at least one of the complex amplitude of the downlink channel multipath, the first vector, the second vector, the downlink channel estimation matrix, the covariance matrix of the downlink channel estimation matrix, and the correlation matrix of the downlink channel estimation matrix.

[0101] Optionally, the complex amplitude of the downlink channel multipath may include amplitude and phase.

[0102] Optionally, the mapping relationship between the complex amplitude of the downlink channel multipath and the subarray of the network side device can be reflected by a mapping table. The complex amplitude of the downlink channel multipath can be notified to the network side device by the UE by means of a transmission index, for example, as shown in Table 1 below.

[0103] Table 1:

[0104] Optionally, the mapping relationship between the complex amplitude of the downlink channel multipath and at least one item of the third information can be represented by a mapping table. Specifically, the content of the mapping table can be presented in the following form: the complex amplitude of the downlink channel multipath is associated with at least one item of the signal configuration information used for downlink channel measurement.

[0105] Optionally, the signal configuration information (or parameter configuration information) may include at least one of the following:

[0106] Waveform types, such as orthogonal frequency division multiplex (OFDM), single-carrier frequency-division multiple access (SC-FDMA), orthogonal time-frequency space (OTFS), frequency modulated continuous wave (FMCW), and pulse signals;

[0107] Subcarrier spacing: For example, the subcarrier spacing of the OFDM system is 30kHz;

[0108] Guard interval: The time interval between the moment a signal ends sending and the moment the latest echo signal of the signal is received; this parameter is proportional to the maximum sensing distance; for example, it can be measured by 2d max / c calculated, d max is the maximum sensing distance (belongs to the sensing requirement), for example, for the self-transmitted and self-received sensing signal or reference signal, d max Represents the maximum distance between the signal receiving and transmitting point. In some cases, the OFDM signal cyclic prefix (CP) can serve as the minimum guard interval.

[0109] Bandwidth: This parameter is inversely proportional to the range resolution and can be obtained by c / (2Δd), where Δd is the range resolution (perception requirement) and c is the speed of light.

[0110] Burst duration: This parameter is inversely proportional to the rate resolution (a perception requirement). It is the time span of the signal and is mainly used to calculate the Doppler frequency shift. This parameter can be calculated by c / (2f c Δv) is calculated; where Δv is the velocity resolution; f c is the carrier frequency of the signal;

[0111] Time domain interval: This parameter can be expressed by c / (2f c v range ) is calculated; where v range It is the maximum rate minus the minimum speed (belongs to the perception requirement); this parameter is the time interval between two adjacent signals;

[0112] Transmit signal power, for example, from -20dBm to 23dBm, with a value of 2dBm;

[0113] Signal format, such as Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), Positioning Reference Signal (PRS), or other predefined signals, as well as related sequence format information;

[0114] Signal direction; for example, the direction of a sensing signal or a reference signal or beam information;

[0115] Time resources, such as the time slot index or symbol index of the time slot where the perception signal or reference signal is located; among them, time resources are divided into two types: one is a one-time time resource, for example, one symbol sends an omnidirectional signal; the other is a non-one-time time resource, such as multiple groups of periodic time resources or discontinuous time resources (which may include start time and end time). Each group of periodic time resources sends a signal in the same direction, and the beam directions of different groups of periodic time resources are different;

[0116] Frequency resources, including the signal's center frequency, bandwidth, resource block (RB) or subcarrier, point A, and starting bandwidth location;

[0117] Quasi co-location (QCL) relationship, for example, the signal includes multiple resources, each resource is associated with a synchronization signal block (Synchronization Signal and PBCH block SSB) QCL, and the QCL includes Type A (Type A), Type B, Type C or Type D;

[0118] Antenna configuration information. The antenna configuration information includes at least one of the following:

[0119] Antenna element ID or antenna port ID used to transmit the sensing signal or reference signal;

[0120] Panel ID and array element ID used to transmit sensing signals or reference signals;

[0121] The position information of the antenna element used to transmit the sensing signal or reference signal relative to a local reference point on the antenna array (which can be expressed in Cartesian coordinates (x, y, z) or spherical coordinates) express);

[0122] The position information of the panel used to transmit the sensing signal or reference signal relative to a local reference point on the antenna array (can be expressed in Cartesian coordinates (x, y, z) or spherical coordinates) ), and the position information of the antenna array elements used to send sensing signals within these selected panels relative to a unified reference point of the panel (such as the center point of the panel) (which can be expressed in Cartesian coordinates (x, y, z) or spherical coordinates) express);

[0123] Bitmap information of the antenna array element. For example, the bitmap uses "1" to indicate that the array element is selected for transmitting the sensing signal or reference signal, and "0" to indicate that the array element is not selected (and vice versa).

[0124] The bitmap information of the array panel. For example, the bitmap uses "1" to indicate that the panel is selected for transmitting the perception signal or reference signal, and "0" to indicate that the array element is not selected (or vice versa). As well as the array element bitmap information within these selected panels;

[0125] Antenna array element amplitude, phase and gain information, that is, antenna array element pattern information.

[0126] It should be understood that the transmission mentioned in the embodiments of the present application can be understood to include at least one of sending and receiving.

[0127] Optionally, in some embodiments, the method further comprises:

[0128] The terminal determines the first vector according to a measured value of a complex amplitude of at least one downlink channel multipath and a target multipath parameter;

[0129] The target multipath parameter is at least one multipath parameter corresponding to the complex amplitude of the row channel multipath in the first channel feedback information.

[0130] Optionally, the terminal determining the first vector according to a measured value of a complex amplitude of at least one downlink channel multipath and a target multipath parameter includes:

[0131] The terminal calculates a steering vector according to the target multipath parameter;

[0132] The terminal performs weighted combination of the measured value of the complex amplitude of the at least one downlink channel multipath and the steering vector to obtain the first vector.

[0133] Optionally, in some embodiments, the method further comprises:

[0134] The terminal determines the second vector according to a measured value of the complex amplitude of at least one downlink channel multipath and information other than the complex amplitude of the downlink channel multipath in the first channel feedback information.

[0135] Optionally, the terminal determining the second vector according to a measured value of the complex amplitude of at least one downlink channel multipath and information other than the complex amplitude of the downlink channel multipath in the first channel feedback information includes:

[0136] The terminal calculates a downlink channel estimation matrix based on a measured value of a complex amplitude of at least one downlink channel multipath, information other than the complex amplitude of the downlink channel multipath in the first channel feedback information, and a channel model hypothesis;

[0137] The terminal performs a target operation to obtain a second vector;

[0138] The target operation includes any of the following:

[0139] performing singular decomposition on the downlink channel estimation matrix;

[0140] Perform eigenvalue decomposition on the covariance matrix or the correlation matrix of the downlink channel estimation matrix.

[0141] In an embodiment of the present application, the above-mentioned channel model assumption includes the channel model used when determining the downlink channel estimation matrix, and the calculation rules for calculating the downlink channel estimation matrix. The channel model refers to a mathematical description of the wireless channel that is pre-summarized based on the actual measurement or theoretical analysis of the wireless channel, such as the 3GPP TR 38.901 model. The channel model assumption can be regarded as a calculation method or calculation function of a channel matrix, whose input is the channel parameter and the output is the channel matrix. In this embodiment, the measured value of the complex amplitude of at least one downlink channel multipath and the information in the first channel information other than the complex amplitude of the downlink channel multipath are used as the input channel parameters, and the downlink channel estimation matrix is ​​used as the output channel matrix.

[0142] Optionally, in some embodiments, the fifth information includes at least one of the following:

[0143] a second multipath parameter, where the second multipath parameter is a multipath parameter of a downlink channel;

[0144] the measured value of a perceived quantity;

[0145] Perceived results;

[0146] Measurement values ​​of perceptual performance evaluation indicators.

[0147] Optionally, in some embodiments, the above-mentioned perception measurements may be divided into the following four categories:

[0148] First-level measurement quantities (received signal / original channel information), including: complex results of the received signal / channel response, amplitude / phase, I / Q path, and their operation results (operations include addition, subtraction, multiplication, and division; matrix addition, subtraction, multiplication, and division; matrix transposition; trigonometric operations; square root operations; and power operations, as well as threshold detection results and maximum / minimum value extraction results from the above operation results; operations also include Fast Fourier Transform (FFT) / Inverse Fast Fourier Transform (IFFT), Discrete Fourier Transform (DFT) / Inverse Discrete Fourier Transform (IDFT), 2D-FFT, 3D-FFT, matched filtering, autocorrelation operation, wavelet transform, and digital filtering, as well as threshold detection results and maximum / minimum value extraction results from the above operation results);

[0149] The second-level measurement quantity (basic measurement quantity) includes: time delay, Doppler, angle, intensity, and their multi-dimensional combination representation;

[0150] Level 3 measurement quantities (basic attributes / states), including: distance, speed, direction, spatial position, acceleration;

[0151] The fourth level of measurement (advanced attributes / states) includes: target presence, trajectory, movement, expression, vital signs, quantity, imaging results, weather, air quality, shape, material, and composition.

[0152] Optionally, the above-mentioned perception measurement also includes corresponding label information:

[0153] Perceive signal identification information;

[0154] Perception measurement configuration identification information;

[0155] Perception service information (e.g., perception service ID);

[0156] Data subscription ID;

[0157] The purpose of the measurement (communication, perception, synaesthesia);

[0158] Time information;

[0159] Perceive node information (e.g., UE ID, node location, device orientation);

[0160] Perception link information (e.g., perception link sequence number, transmitting and receiving node identification);

[0161] Measurement quantity description information (form, such as amplitude value, phase value, complex value combining amplitude and phase; resource type, such as time domain measurement result, frequency domain resource measurement result);

[0162] Measurement indicator information (e.g., Signal-to-Noise Ratio (SNR), perceived SNR).

[0163] Optionally, the above-mentioned perception result may be a result obtained by further calculating the perception measurement value, such as the position of the perception target, the motion trajectory of the perception target, etc.

[0164] Optionally, the above-mentioned perceptual performance evaluation index may be calculated based on a perceptual measurement quantity, and may specifically include at least one of the following:

[0165] Perception SNR, which is the ratio of the perception signal energy reflected by the perception object or perception area to the noise signal energy in the environment and the device;

[0166] Perception signal-to-interference plus noise ratio (SINR), which is the ratio of the perception signal energy reflected by the perception object or perception area to the sum of the energy of the interference signal and noise signal in the environment and device;

[0167] The statistical mean, standard deviation, or variance of multiple measurements of the same perceptual measure;

[0168] The deviation between the predicted value of the sensory measurement quantity or sensory result and the actual measurement value, as well as the statistical mean, standard deviation or variance of the deviation;

[0169] Ambiguity function-related evaluation indicators include the normalized sidelobe level (NSL), which is the height of the highest sidelobe of the normalized ambiguity function; or the ratio of the main lobe to the highest sidelobe of the ambiguity function (or the ratio of the highest sidelobe to the main lobe); in addition, the number of normalized ambiguity function sidelobes with peaks above a given threshold, total power, total energy, and the width of the ambiguity function main lobe (3dB width) may also be included;

[0170] The Cramér-Rao Lower Bound (CRLB) is the lowest variance that can be achieved by all unbiased estimators. It is mathematically equal to the inverse of the Fisher information and is related to the perceived SNR.

[0171] The Capacity-Distortion Tradeoff function quantitatively gives the maximum achievable rate of reliable transmission of the synaesthesia integrated system under given distortion constraints;

[0172] Equivalent mean square error (MSE) converts the spectral efficiency of communication into equivalent radar mean square error and combines it with the perception Cramer-Rao lower bound to obtain the result.

[0173] Radar Estimation-Communication Rate, which uses the sensing channel as a non-cooperative

[0174] The mutual information between the communication channel, the perception system and the target is the estimated rate;

[0175] Welch Bound;

[0176] Perceptual reproducibility evaluation metrics (such as the sum of the Euclidean distances between two sequence samples, or the regularized path distance in Dynamic Time Warping (DTW), or other metrics that can reflect the similarity between two sequences, including but not limited to: Longest Common Subsequence (LCSS), Edit Distance on Real Sequences (EDR), Edit Distance with Real Penalty (ERP), Hausdorff Distance, Fréchet Distance, One Way Distance (OWD), Locality In-between Polylines (LIP), etc.);

[0177] The result of performing at least one operation of addition, subtraction, multiplication, or division on at least two of the above indicators.

[0178] Optionally, in some embodiments, the second channel feedback information satisfies at least one of the following:

[0179] The second channel feedback information includes at least part of the fourth information, or includes an index corresponding to a value obtained by quantizing at least part of the fourth information;

[0180] The second channel feedback information includes at least part of the information in the fifth information, or includes an index corresponding to a value obtained by quantizing at least part of the information in the fifth information.

[0181] Optionally, in some embodiments, the second channel feedback information further includes channel feedback indication information, where the channel feedback indication information is used to indicate at least one of the following:

[0182] The feedback content type of the fourth information;

[0183] The feedback content type of the fifth information.

[0184] In the embodiment of the present application, since the terminal sends channel feedback indication information to the network side device, the channel information that needs to be fed back can be determined based on the implementation of the terminal, thereby improving the flexibility of the channel feedback.

[0185] For example: in some embodiments, type 1 corresponds to the fourth information type including multipath parameter information (including the complex amplitude of the downlink channel multipath, the delay of the multipath, the angle of the multipath, the near-field and far-field information, the first-hop multipath distance, the last-hop multipath distance and the subarray index), and the mapping relationship between the multipath parameter information and the subarray of the network side device or at least one item of the signal configuration information for downlink channel measurement; type 2 corresponds to the fourth information type including the first vector and its mapping relationship with the subarray of the network side device or at least one item of the signal configuration information for downlink channel measurement; type 3 corresponds to the fourth information type including the second vector and its mapping relationship with the subarray of the network side device or at least one item of the signal configuration information for downlink channel measurement; type 4 corresponds to the fourth information type including the downlink channel estimation matrix, the covariance matrix of the downlink channel estimation matrix or the correlation matrix of the downlink channel estimation matrix, and its mapping relationship with the subarray of the network side device or at least one item of the signal configuration information for downlink channel measurement; type 5 corresponds to the fourth information type including any at least two types of the above four types.

[0186] Optionally, in some embodiments, before the terminal receives the first information from the network-side device, the method further includes:

[0187] The terminal sends sixth information to the network side device, where the sixth information is used to assist the uplink channel measurement.

[0188] In this embodiment of the present application, the sixth information may include at least one of the following:

[0189] UE location information;

[0190] UE's physical antenna array information (including antenna configuration information, antenna panel orientation, array type, number of antennas (including horizontal and vertical directions), array aperture, antenna polarization characteristics, array element gain and directivity characteristics);

[0191] UE status information (including moving speed, moving direction, time period of stationary / moving, etc.);

[0192] UE communication capability information (including UE communication coverage, maximum bandwidth available for communication services, maximum number of antenna ports available for communication services, etc.);

[0193] UE sensing capability information (including UE sensing coverage, maximum bandwidth available for sensing services, maximum duration of sensing services, supported signal types and frame formats, etc.);

[0194] Resource information currently available to the UE for communication and / or perception (including time resources (number of symbols, number of time slots, number of frames, etc.), frequency resources (number of resource blocks (RBs), number of resource elements (REs), total bandwidth, available frequency band location, etc.), antenna resources (number of antennas / antenna subarrays), orthogonal code resources (length and number of orthogonal codes), etc.).

[0195] Optionally, before performing the uplink channel measurement, the network-side device may further send signal configuration information for the uplink channel measurement to the terminal.

[0196] Optionally, in some embodiments, the multipath parameter includes at least one of a multipath complex amplitude, a multipath delay, a multipath angle, far-field and near-field information, a first-hop multipath distance, and a last-hop multipath distance;

[0197] The far-field and near-field information is used to indicate the far-field and near-field relationship between the multipath and the first set, where the first set is a subarray set of all subarrays of the network-side device, where the signal propagation path between the network-side device and the terminal includes the multipath; the first-hop multipath distance is the distance between the first-hop reflection point or scattering point of the multipath and a preset reference point of the network-side device; and the last-hop multipath distance is the distance between the last-hop reflection point or scattering point of the multipath and a preset reference point of the terminal.

[0198] In the embodiment of the present application, the above sub-array set can be understood as the above visible area, that is, each visible area corresponds to a sub-array set. It should be understood that the visible area can be a region set consisting of multiple spatially discontinuous regions.

[0199] Optionally, the multipath angle may include at least one of an azimuth of arrival (AOA), an azimuth of departure (AOD), an elevation of arrival (EOA), and an elevation of departure (EOD). The complex amplitude of the downlink channel multipath includes amplitude and phase.

[0200] Optionally, the mapping relationship between the first multipath parameter and the subarray of the network-side device includes any one of the following:

[0201] a mapping relationship between the first multipath parameter and a first index, where the first index is an index of a subarray of the network-side device;

[0202] A mapping relationship between the first multipath parameter and first configuration information, where the first configuration information is antenna configuration information of a subarray of the network-side device;

[0203] a mapping relationship between the first multipath parameter and a target array and antenna ports, wherein the target array is a physical antenna array array corresponding to a subarray of a network-side device;

[0204] The mapping relationship between the first multipath parameter and the target formation and antenna configuration information.

[0205] In an embodiment of the present application, when the number of antenna ports of the network side device subarray is greater than 1, the first multipath parameter or the second multipath parameter can be associated with at least one antenna port index of at least one subarray of the network side device.

[0206] Optionally, for the mapping relationship between the first multipath parameter and the target formation and antenna port, for example, the multipath parameter is associated with "formation 2: rectangular array" and antenna port index {1, 4, 13, 16}, wherein the physical antennas corresponding to the antenna port index {1, 4, 13, 16} are the physical antennas at the four corners of the rectangular array. The above association method, in which the multipath parameter is associated with "formation 2: rectangular array" and antenna port index {1, 4, 13, 16}, can be equivalently understood as: the first multipath parameter is associated with antenna port index {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}.

[0207] It should be noted that the above-mentioned multipath parameters (i.e., the first multipath parameter or the second multipath parameter) are used to represent the corresponding multipath, so the multipath parameter can be understood or replaced by the multipath or multipath parameter. For example, the mapping relationship between the contents of the multipath parameter can be understood as the mapping relationship between the contents of the multipath.

[0208] It should be understood that the mapping relationship between the contents of the first multipath parameters and the mapping relationship between the first multipath parameters and the subarrays of the network-side devices can be represented by a mapping table, as specifically shown in Table 2 below. It should be noted that during actual information transmission, multiple mapping tables can be used to jointly represent the information, each of which is a subtable of Table 2, that is, includes some elements of Table 2.

[0209] Table 2:

[0210] Optionally, in some embodiments, the first information satisfies at least one of the following:

[0211] The first information is at least part of the second information;

[0212] The first information is an index corresponding to a value obtained by quantizing at least part of the second information.

[0213] In the embodiment of the present application, the first information may be notified to the terminal by the network side device in the form of a transmission index. At least one of the complex amplitude value of the uplink channel multipath, the complex amplitude phase of the uplink channel multipath, the multipath delay, the multipath angle (including AOA, AOD, EOA, EOD), and the last hop multipath distance (LBCD) in the first information can be quantized based on a pre-agreed quantization rule, and the network side device only needs to indicate the index corresponding to the quantized value to the UE. Table 3 takes LBCD as an example for illustration, assuming that the system bandwidth B sys The quantization granularity of LBCD can be selected as c / B sys , that is 0.375m.

[0214] Table 3:

[0215] Assume that the network side device needs to indicate the parameter information of Cluster ID 6 in Table 2 of the UE, where the measured value of LBCD is 4.888m. The actual network side device only needs to indicate the quantization index value 4 corresponding to the UE LBCD (a certain degree of accuracy can be sacrificed to reduce transmission overhead). The other first information contents are similar and will not be elaborated on. Among them, the complex amplitude value of the uplink channel multipath and the multipath delay can be quantized values ​​normalized by the maximum value, and the complex amplitude value or delay maximum value is the maximum value of the complex amplitude value or delay value of all multipaths obtained in this uplink channel estimation.

[0216] It should be noted that after receiving the second channel feedback information, the network-side device may perform at least one of the following:

[0217] Based on the second channel feedback information, downlink communication transmission is performed,

[0218] Based on the second channel feedback information, the perception result is sent to the perception core network device, or the perception result is further calculated and sent to the perception core network device;

[0219] Among them, the core network equipment can be a sensing function network element (Sensing Function, SF), an access and mobility management function (Access and Mobility Management Function, AMF), a perception application server in the core network, etc.

[0220] In order to better understand the present application, some examples are given below for detailed description.

[0221] Optionally, in some embodiments, the solution based on the present application can implement UE downlink channel or codebook feedback to assist the BS in downlink beamforming, improve transmission capacity, and save feedback overhead and energy. Taking Figure 3 as an example, for the convenience of explanation, it is assumed that there are only two reflectors in the channel, where reflector 1 corresponds to far-field cluster 1 and far-field cluster 2 in the figure, and reflector 2 corresponds to near-field cluster 1 and far-field cluster 3 in the figure. It should be pointed out that here, in order to indicate that the multipath caused by the reflector may be multi-hop reflection, the reflector is represented by two clusters (i.e., far-field cluster 1 and far-field cluster 2, near-field cluster 1 and far-field cluster 3 in Figure 3, which are also called twin-clusters. When it is a single-hop reflection, far-field cluster 1 and far-field cluster 2 in the figure overlap as one cluster, and near-field cluster 1 and far-field cluster 3 overlap as one cluster). Far-field cluster 1 and near-field cluster 1 are clusters observed from the BS side, and far-field cluster 2 and far-field cluster 3 are clusters observed from the UE side. Assume that the arrays used by the BS and UE are both linear arrays, and assume that the BS array is divided into N tx = n subarrays, and assuming that the number of array elements in each subarray is equal, each subarray has 1 logical antenna port, and the UE has N rx Other array forms can also use the solution of this application with only slight modifications.

[0222] After uplink channel measurement, the multipath parameter corresponding to reflector 1 is: Corresponding to visible area 1, the subarray index is {1, 2, ..., n1} (n1 = 3 in Figure 3); the multipath parameter corresponding to reflector 2 is where d BS,2 is the uplink last-hop multipath distance LBCD, corresponding to visible area 2, and the subarray index is {n2, n2+1, ..., Ntx} (n2 = 3 in Figure 3);

[0223] After step 401, the UE obtains the first information;

[0224] After step 402, the UE performs parameter estimation to obtain multipath parameters and Since the channel is partially reciprocal, we have τ UE,1 =τ BS,1 =τ1,τ UE,2 =τ BS,2 =τ2, Therefore, the UE obtains the downlink channel multipath parameters The complex amplitudes α1 and α2 of the downlink channel multipath can be obtained by maximum likelihood estimation, that is,

[0225] in are the steering vectors of the multipath corresponding to reflector 1 at the BS and UE sides (module value is 1), are the steering vectors of the multipath corresponding to reflector 2 at the BS and UE sides, The channel matrix obtained by estimating the downlink channel on the UE side corresponds to the subarray index {1,2,...,n1} and the channel between the UE and the subarray index {n2,n2+1,...,N tx} and the channel between the UE. Since the UE obtains the subarray index {1,2,...,n1}, {n2,n2+1,...,N tx} and the corresponding reference signal configuration information, so it is easy to get

[0226] In general, each antenna port of the BS needs to send a reference signal in the downlink channel measurement to obtain the complete MIMO channel information. However, due to the spatial non-stationary characteristics of the channel, this process easily leads to the waste of orthogonal time-frequency resources and energy consumption for channel measurement. If n1 ≥ n2, the BS can use only part of the subarray (antenna port) to send the reference signal in the downlink channel estimation. After the UE performs the downlink channel estimation, it can obtain The complex amplitude of the downlink channel multipath is

[0227] in Indicates channel The channel coefficient matrix at the time delay τ can be obtained by maximum likelihood estimation. When n1=n2, the steering vector Degenerates to 1, then This is the SIMO channel between the BS antenna port index {n1} and the UE. This means that downlink channel measurement only requires antenna port index {n1} to transmit a reference signal. The BS can configure the antenna port for downlink channel measurement based on the uplink channel measurement, achieving a trade-off between orthogonal time-frequency resources, energy consumption, and channel estimation accuracy.

[0228] Optionally, if the UE reports the second information to the BS before step 401, the BS may obtain the multipath parameters of reflector 1 and reflector 2 as And send it to UE. According to the partial reciprocity of the channel, That is, UE directly obtains multipath parameters This implementation can reduce the complexity of UE downlink channel parameter estimation.

[0229] For step 403, the UE feeds back the fourth information to the BS. There are five possible implementations:

[0230] Method 1: The UE directly feeds back the complex amplitudes α1 and α2 of the downlink channel multipath, or the quantized value index of their maximum amplitude normalized and the phase quantized value index, as well as their mapping relationship with the visible area (i.e., the association relationship of the subarray set); optionally, the UE feeds back At least one of

[0231] Method 2: UE feeds back the complex amplitudes α1, α2 of the downlink channel multipath and At least one item, and their mapping relationship with the visible area (ie, the association relationship between the sub-array set), where the coefficients β1 and β2 are calculated by the UE according to α1, α2, Calculated through linear transformation;

[0232] Method 3: UE feeds back the covariance matrix or eigenvector of the correlation matrix of the downlink channel estimation matrix At least one item of , and their mapping relationship with the visual area (i.e., the association relationship of the sub-array set);

[0233] Method 4: UE feedback At least one item of the channel matrix, or at least one item of their covariance matrix or correlation matrix, and their mapping relationship with the visible area (i.e., the association relationship of the sub-array set);

[0234] Mode 5: A combination of any two of the above modes 1 to 4. For example, the UE feeds back the complex amplitude α2 of the downlink channel multipath and At least one item, and their mapping relationship with the visible area (ie, the association relationship between the sub-array set), where the coefficients β1 and β2 are calculated by the UE according to α1, α2, It is calculated by linear transformation (corresponding to method 2); at the same time, the UE feeds back the covariance matrix of the downlink channel estimation matrix or the eigenvector of the correlation matrix and their mapping relationship with the visual area (ie, the association relationship of the sub-array set) (corresponding to method 3).

[0235] After receiving the fourth information, the BS can implement downlink communication transmission.

[0236] It should be noted that the above embodiment assumes only two primary reflectors in the channel. In practice, the number of reflectors may vary, and the reflectors may correspond to multiple objects in the environment. For different numbers of reflectors, the channel feedback information should be increased or decreased accordingly. It should be understood that this solution and process are applicable to different numbers of reflectors and different MIMO array configurations.

[0237] Optionally, in some embodiments, the solution based on the present application can achieve perception or synaesthesia integration. The embodiments of the present application are illustrated by three different scenarios, taking Figure 3 as an example.

[0238] Scenario 1: Assume that the sensing target (such as a vehicle, pedestrian, etc.) corresponds to the near-field cluster 1 in the figure, that is, it falls within the near-field area of ​​the BS. If the sensing target needs to be located, it can be directly obtained on the BS side through uplink channel measurement. where d BS,2 is the uplink last-hop multipath distance LBCD. If the UE is the initiator of the sensing request, in step 401, the BS sends the first information and the third information (the BS's location information and the BS's antenna array panel orientation information) to the UE, and the UE obtains the sensing target location;

[0239] Scenario 2: Assume that the sensing target (such as a vehicle or pedestrian) corresponds to the far-field cluster 1 in the figure, that is, it falls within the far-field area of ​​the BS. In this case, the BS side can be obtained by uplink channel measurement. Obtain the UE side's If it is a single-hop reflection path, based on The position of the target can be determined; if it is a multi-hop reflection path, combined with As well as the far-field decision condition first-hop or last-hop multipath distance search, it is also possible to determine the perceived target location;

[0240] Scenario 3: Assume that the sensing target (e.g., vehicle, pedestrian, etc.) corresponds to near-field cluster 1 in the figure, that is, it falls within the near-field area of ​​the BS. At the same time, assume that within a certain period of time, the channel can maintain reciprocity between the uplink and downlink parts. The UE can repeat step 402 multiple times, and the BS obtains multiple sets of fourth information and / or fifth information that are continuous in time (e.g., multiple sets of complex amplitudes of downlink channel multipath α2(t1), α2(t2), ..., α2(t m ),as well as The multipath Doppler frequency is further derived from the complex amplitude phase change, and combined with the multipath angle information, the true velocity, magnitude, and direction of the perceived target, as well as its trajectory, are obtained. Optionally, the above processing can also be performed directly by the UE. If the BS or core network device is the perception requester, the UE reports the calculated true velocity, magnitude, and direction of the perceived target, as well as its trajectory, to the BS as the fifth information content.

[0241] 5 , an embodiment of the present application further provides a channel feedback method. As shown in FIG5 , the channel feedback method includes:

[0242] Step 501: The network side device performs uplink channel measurement to obtain second information;

[0243] Step 502: The network-side device sends first information to the terminal, where the first information is determined based on at least part of the second information, and the first information is used to perform downlink channel measurement;

[0244] Step 503: The network-side device receives second channel feedback information from the terminal, where the second channel feedback information is determined based on at least part of the first channel feedback information obtained by the downlink channel measurement.

[0245] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0246] Optionally, the method further includes:

[0247] The network side device sends third information to the terminal, where the third information is used to perform the downlink channel measurement in conjunction with the first information;

[0248] The third information includes at least one of the following:

[0249] The network side device is used to obtain array configuration information of the second information;

[0250] Signal configuration information for downlink channel measurement;

[0251] Location information of network-side devices;

[0252] Physical antenna array information of network-side devices.

[0253] Optionally, the second channel feedback information includes at least one of fourth information and fifth information;

[0254] The fourth information is feedback information associated with communication, and the fifth information is feedback information associated with perception.

[0255] Optionally, the second channel feedback information satisfies at least one of the following:

[0256] The second channel feedback information includes at least part of the fourth information, or includes an index corresponding to a value obtained by quantizing at least part of the fourth information;

[0257] The second channel feedback information includes at least part of the information in the fifth information, or includes an index corresponding to a value obtained by quantizing at least part of the information in the fifth information.

[0258] Optionally, the fourth information includes at least one of the following:

[0259] Complex amplitude of downlink channel multipath;

[0260] a mapping relationship between the complex amplitude of the downlink channel multipath and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0261] a mapping relationship between the complex amplitude of the downlink channel multipath and at least one item of the third information;

[0262] a first vector and a mapping relationship between the first vector and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0263] a second vector and a mapping relationship between the second vector and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0264] A downlink channel estimation matrix and a mapping relationship between the downlink channel estimation matrix and at least one of a subarray of the network-side device or signal configuration information for downlink channel measurement;

[0265] A covariance matrix of a downlink channel estimation matrix and a mapping relationship between the covariance matrix and at least one of a subarray of the network-side device or signal configuration information for downlink channel measurement;

[0266] A correlation matrix of a downlink channel estimation matrix and a mapping relationship between the correlation matrix and at least one of the subarrays of the network side device or signal configuration information for downlink channel measurement.

[0267] Optionally, the fifth information includes at least one of the following:

[0268] a second multipath parameter, where the second multipath parameter is a multipath parameter of a downlink channel;

[0269] the measured value of a perceived quantity;

[0270] Perceived results;

[0271] Measurement values ​​of perceptual performance evaluation indicators.

[0272] Optionally, the second channel feedback information further includes at least one of the following:

[0273] The feedback content type of the fourth information;

[0274] The feedback content type of the fifth information.

[0275] Optionally, before the network-side device performs uplink channel measurement to obtain the second information, the method further includes:

[0276] The network-side device receives sixth information from the terminal, where the sixth information is used to assist the uplink channel measurement.

[0277] Optionally, the multipath parameter includes at least one of a multipath complex amplitude, a multipath delay, a multipath angle, far-field and near-field information, a first-hop multipath distance, and a last-hop multipath distance;

[0278] The far-field and near-field information is used to indicate the far-field and near-field relationship between the multipath and the first set, where the first set is a subarray set of all subarrays of the network-side device, where the signal propagation path between the network-side device and the terminal includes the multipath; the first-hop multipath distance is the distance between the first-hop reflection point or scattering point of the multipath and a preset reference point of the network-side device; and the last-hop multipath distance is the distance between the last-hop reflection point or scattering point of the multipath and a preset reference point of the terminal.

[0279] Optionally, the mapping relationship between the first multipath parameter and the subarray of the network-side device includes any one of the following:

[0280] a mapping relationship between the first multipath parameter and a first index, where the first index is an index of a subarray of the network-side device;

[0281] A mapping relationship between the first multipath parameter and first configuration information, where the first configuration information is antenna configuration information of a subarray of the network-side device;

[0282] a mapping relationship between the first multipath parameter and a target array and antenna ports, wherein the target array is a physical antenna array array corresponding to a subarray of a network-side device;

[0283] The mapping relationship between the first multipath parameter and the target formation and antenna configuration information.

[0284] Optionally, the first information satisfies at least one of the following:

[0285] The first information is at least part of the second information;

[0286] The first information is an index corresponding to a value obtained by quantizing at least part of the second information.

[0287] The channel feedback method provided in the embodiment of the present application can be executed by a channel feedback device. In the embodiment of the present application, the channel feedback device provided in the embodiment of the present application is described by taking the channel feedback method executed by the channel feedback device as an example.

[0288] 6 , an embodiment of the present application further provides a channel feedback device. As shown in FIG6 , the channel feedback device 600 includes:

[0289] A first receiving module 601 is configured to receive first information from a network-side device, where the first information is determined based on at least part of the second information obtained by uplink channel measurement; and perform downlink channel measurement based on the first information to obtain first channel feedback information.

[0290] A first sending module 602 is configured to send second channel feedback information to a network-side device, where the second channel feedback information is determined based on at least part of the first channel feedback information;

[0291] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0292] Optionally, the first receiving module 601 is specifically configured to:

[0293] Perform downlink channel measurement based on the first information and third information sent by the network side device;

[0294] determining first channel feedback information according to at least one of the first information and the third information and a measurement result of the downlink channel measurement;

[0295] The third information includes at least one of the following:

[0296] The network side device is used to obtain array configuration information of the second information;

[0297] Signal configuration information for downlink channel measurement;

[0298] Location information of network-side devices;

[0299] Physical antenna array information of network-side devices.

[0300] Optionally, the first channel feedback information includes at least one of fourth information and fifth information;

[0301] The fourth information is feedback information associated with communication, and the fifth information is feedback information associated with perception.

[0302] Optionally, the second channel feedback information satisfies at least one of the following:

[0303] The second channel feedback information includes at least part of the fourth information, or includes an index corresponding to a value obtained by quantizing at least part of the fourth information;

[0304] The second channel feedback information includes at least part of the information in the fifth information, or includes an index corresponding to a value obtained by quantizing at least part of the information in the fifth information.

[0305] Optionally, the fourth information includes at least one of the following:

[0306] Complex amplitude of downlink channel multipath;

[0307] a mapping relationship between the complex amplitude of the downlink channel multipath and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0308] a mapping relationship between the complex amplitude of the downlink channel multipath and at least one item of the third information;

[0309] a first vector and a mapping relationship between the first vector and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0310] a second vector and a mapping relationship between the second vector and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0311] A downlink channel estimation matrix and a mapping relationship between the downlink channel estimation matrix and at least one of a subarray of the network-side device or signal configuration information for downlink channel measurement;

[0312] A covariance matrix of a downlink channel estimation matrix and a mapping relationship between the covariance matrix and at least one of a subarray of the network-side device or signal configuration information for downlink channel measurement;

[0313] A correlation matrix of a downlink channel estimation matrix and a mapping relationship between the correlation matrix and at least one of the subarrays of the network side device or signal configuration information for downlink channel measurement.

[0314] Optionally, the channel feedback device 600 further includes:

[0315] a determination module, configured to determine the first vector according to a measured value of a complex amplitude of at least one downlink channel multipath and a target multipath parameter;

[0316] The target multipath parameter is at least one multipath parameter corresponding to the complex amplitude of the row channel multipath in the first channel feedback information.

[0317] Optionally, the determining module is specifically configured to:

[0318] Calculating a steering vector according to the target multipath parameter;

[0319] The first vector is obtained by weightedly combining the measured value of the complex amplitude of the at least one downlink channel multipath and the steering vector.

[0320] Optionally, the channel feedback device 600 further includes:

[0321] The determination module is configured to determine the second vector according to a measured value of the complex amplitude of at least one downlink channel multipath and information other than the complex amplitude of the downlink channel multipath in the first channel feedback information.

[0322] Optionally, the determining module is specifically configured to:

[0323] Obtaining a downlink channel estimation matrix by calculation based on a measured value of a complex amplitude of at least one downlink channel multipath, information other than the complex amplitude of the downlink channel multipath in the first channel feedback information, and a channel model assumption;

[0324] Perform the target operation to obtain the second vector;

[0325] The target operation includes any of the following:

[0326] performing singular decomposition on the downlink channel estimation matrix;

[0327] Perform eigenvalue decomposition on the covariance matrix or the correlation matrix of the downlink channel estimation matrix.

[0328] Optionally, the fifth information includes at least one of the following:

[0329] a second multipath parameter, where the second multipath parameter is a multipath parameter of a downlink channel;

[0330] the measured value of a perceived quantity;

[0331] Perceived results;

[0332] Measurement values ​​of perceptual performance evaluation indicators.

[0333] Optionally, the second channel feedback information further includes channel feedback indication information, where the channel feedback indication information is used to indicate at least one of the following:

[0334] The feedback content type of the fourth information;

[0335] The feedback content type of the fifth information.

[0336] Optionally, the first sending module 602 is further used to: send sixth information to the network side device, where the sixth information is used to assist the uplink channel measurement.

[0337] Optionally, the multipath parameter includes at least one of a multipath complex amplitude, a multipath delay, a multipath angle, far-field and near-field information, a first-hop multipath distance, and a last-hop multipath distance;

[0338] The far-field and near-field information is used to indicate the far-field and near-field relationship between the multipath and the first set, where the first set is a subarray set of all subarrays of the network-side device, where the signal propagation path between the network-side device and the terminal includes the multipath; the first-hop multipath distance is the distance between the first-hop reflection point or scattering point of the multipath and a preset reference point of the network-side device; and the last-hop multipath distance is the distance between the last-hop reflection point or scattering point of the multipath and a preset reference point of the terminal.

[0339] Optionally, the mapping relationship between the first multipath parameter and the subarray of the network-side device includes any one of the following:

[0340] a mapping relationship between the first multipath parameter and a first index, where the first index is an index of a subarray of the network-side device;

[0341] A mapping relationship between the first multipath parameter and first configuration information, where the first configuration information is antenna configuration information of a subarray of the network-side device;

[0342] a mapping relationship between the first multipath parameter and a target array and antenna ports, wherein the target array is a physical antenna array array corresponding to a subarray of a network-side device;

[0343] The mapping relationship between the first multipath parameter and the target formation and antenna configuration information.

[0344] Optionally, the first information satisfies at least one of the following:

[0345] The first information is at least part of the second information;

[0346] The first information is an index corresponding to a value obtained by quantizing at least part of the second information.

[0347] 7 , an embodiment of the present application further provides a channel feedback device. As shown in FIG7 , the channel feedback device 700 includes:

[0348] The second receiving module 701 is configured to perform uplink channel measurement to obtain second information;

[0349] A second sending module 702 is configured to send first information to a terminal, where the first information is determined based on at least part of the second information, and the first information is used to perform downlink channel measurement;

[0350] The second receiving module 701 is further configured to receive second channel feedback information from the terminal, where the second channel feedback information is determined based on at least part of the first channel feedback information obtained by the downlink channel measurement;

[0351] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0352] Optionally, the second sending module 702 is further configured to send third information to the terminal, where the third information is used to perform the downlink channel measurement in conjunction with the first information;

[0353] The third information includes at least one of the following:

[0354] The network side device is used to obtain array configuration information of the second information;

[0355] Signal configuration information for downlink channel measurement;

[0356] Location information of network-side devices;

[0357] Physical antenna array information of network-side devices.

[0358] Optionally, the second channel feedback information includes at least one of fourth information and fifth information;

[0359] The fourth information is feedback information associated with communication, and the fifth information is feedback information associated with perception.

[0360] Optionally, the second channel feedback information satisfies at least one of the following:

[0361] The second channel feedback information includes at least part of the fourth information, or includes an index corresponding to a value obtained by quantizing at least part of the fourth information;

[0362] The second channel feedback information includes at least part of the information in the fifth information, or includes an index corresponding to a value obtained by quantizing at least part of the information in the fifth information.

[0363] Optionally, the fourth information includes at least one of the following:

[0364] Complex amplitude of downlink channel multipath;

[0365] a mapping relationship between the complex amplitude of the downlink channel multipath and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0366] a mapping relationship between the complex amplitude of the downlink channel multipath and at least one item of the third information;

[0367] a first vector and a mapping relationship between the first vector and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0368] a second vector and a mapping relationship between the second vector and at least one of the subarray of the network-side device or signal configuration information for downlink channel measurement;

[0369] A downlink channel estimation matrix and a mapping relationship between the downlink channel estimation matrix and at least one of a subarray of the network-side device or signal configuration information for downlink channel measurement;

[0370] A covariance matrix of a downlink channel estimation matrix and a mapping relationship between the covariance matrix and at least one of a subarray of the network-side device or signal configuration information for downlink channel measurement;

[0371] A correlation matrix of a downlink channel estimation matrix and a mapping relationship between the correlation matrix and at least one of the subarrays of the network side device or signal configuration information for downlink channel measurement.

[0372] Optionally, the fifth information includes at least one of the following:

[0373] a second multipath parameter, where the second multipath parameter is a multipath parameter of a downlink channel;

[0374] the measured value of a perceived quantity;

[0375] Perceived results;

[0376] Measurement values ​​of perceptual performance evaluation indicators.

[0377] Optionally, the second channel feedback information further includes at least one of the following:

[0378] The feedback content type of the fourth information;

[0379] The feedback content type of the fifth information.

[0380] Optionally, the second receiving module 701 is further configured to receive sixth information from the terminal, where the sixth information is used to assist the uplink channel measurement.

[0381] Optionally, the multipath parameter includes at least one of a multipath complex amplitude, a multipath delay, a multipath angle, far-field and near-field information, a first-hop multipath distance, and a last-hop multipath distance;

[0382] The far-field and near-field information is used to indicate the far-field and near-field relationship between the multipath and the first set, where the first set is a subarray set of all subarrays of the network-side device, where the signal propagation path between the network-side device and the terminal includes the multipath; the first-hop multipath distance is the distance between the first-hop reflection point or scattering point of the multipath and a preset reference point of the network-side device; and the last-hop multipath distance is the distance between the last-hop reflection point or scattering point of the multipath and a preset reference point of the terminal.

[0383] Optionally, the mapping relationship between the first multipath parameter and the subarray of the network-side device includes any one of the following:

[0384] a mapping relationship between the first multipath parameter and a first index, where the first index is an index of a subarray of the network-side device;

[0385] A mapping relationship between the first multipath parameter and first configuration information, where the first configuration information is antenna configuration information of a subarray of the network-side device;

[0386] a mapping relationship between the first multipath parameter and a target array and antenna ports, wherein the target array is a physical antenna array array corresponding to a subarray of a network-side device;

[0387] The mapping relationship between the first multipath parameter and the target formation and antenna configuration information.

[0388] Optionally, the first information satisfies at least one of the following:

[0389] The first information is at least part of the second information;

[0390] The first information is an index corresponding to a value obtained by quantizing at least part of the second information.

[0391] The channel feedback device in the embodiments of the present application can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or chip. The electronic device can be a terminal or other device other than a terminal. For example, the terminal can include but is not limited to the types of terminal 11 listed above, and other devices can include servers, network attached storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0392] The channel feedback device provided in the embodiment of the present application can implement the various processes implemented in the method embodiments of Figures 4 to 5 and achieve the same technical effects. To avoid repetition, they will not be described here.

[0393] As shown in Figure 8, an embodiment of the present application also provides a communication device 800, including a processor 801 and a memory 802, where the memory 802 stores a program or instruction that can be run on the processor 801. When the program or instruction is executed by the processor 801, the various steps of the above-mentioned channel feedback method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, they are not repeated here.

[0394] The present application also provides a terminal comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the method embodiment shown in FIG4 . This terminal embodiment corresponds to the aforementioned terminal-side method embodiment, and each implementation process and implementation method of the aforementioned method embodiment is applicable to this terminal embodiment and can achieve the same technical effects. Specifically, FIG9 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0395] The terminal 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909 and at least some of the components of the processor 910.

[0396] Those skilled in the art will appreciate that the terminal 900 may further include a power supply (e.g., a battery) to power various components. The power supply may be logically connected to the processor 910 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG9 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components or arrange the components differently, which will not be described in detail here.

[0397] It should be understood that in an embodiment of the present application, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042, and the graphics processor 9041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and at least one of other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and an operating stick, which will not be repeated here.

[0398] In the embodiment of the present application, after receiving downlink data from a network-side device, the RF unit 901 may transmit the data to the processor 910 for processing. Furthermore, the RF unit 901 may send uplink data to the network-side device. Typically, the RF unit 901 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0399] The memory 909 can be used to store software programs or instructions and various data. The memory 909 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 909 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be 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), or a flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DRRAM). The memory 909 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0400] Processor 910 may include one or more processing units. Optionally, processor 910 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 910.

[0401] The radio frequency unit 901 receives first information from a network-side device, where the first information is determined based on at least part of second information obtained by uplink channel measurement; performs downlink channel measurement based on the first information to obtain first channel feedback information; and sends second channel feedback information to the network-side device, where the second channel feedback information is determined based on at least part of the first channel feedback information;

[0402] The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, wherein the first multipath parameter is a multipath parameter of an uplink channel.

[0403] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the terminal side method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be repeated here.

[0404] The present application also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the method embodiment shown in FIG5 . This network-side device embodiment corresponds to the aforementioned network-side device method embodiment, and each implementation process and implementation method of the aforementioned method embodiment are applicable to this network-side device embodiment and can achieve the same technical effects.

[0405] Specifically, embodiments of the present application also provide a network-side device. As shown in Figure 10, network-side device 1000 includes an antenna 101, a radio frequency device 102, a baseband device 103, a processor 104, and a memory 105. Antenna 101 is connected to radio frequency device 102. In the uplink direction, radio frequency device 102 receives information via antenna 101 and sends the received information to baseband device 103 for processing. In the downlink direction, baseband device 103 processes the information to be transmitted and sends it to radio frequency device 102. Radio frequency device 102 processes the received information and then sends it through antenna 101.

[0406] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 103 , which includes a baseband processor.

[0407] The baseband device 103 may include, for example, at least one baseband board, on which multiple chips are arranged, as shown in Figure 10, one of which is, for example, a baseband processor, which is connected to the memory 105 through a bus interface to call the program in the memory 105 and execute the network device operations shown in the above method embodiment.

[0408] The network side device may further include a network interface 106, which is, for example, a Common Public Radio Interface (CPRI).

[0409] Specifically, the network side device 1000 of the embodiment of the present application also includes: instructions or programs stored in the memory 105 and executable on the processor 104. The processor 104 calls the instructions or programs in the memory 105 to execute the method of execution of each module shown in Figure 7 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0410] An embodiment of the present application further provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned channel feedback method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, they are not described here.

[0411] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0412] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned channel feedback method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0413] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0414] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-mentioned channel feedback method embodiment and can achieve the same technical effects. To avoid repetition, they are not described here.

[0415] An embodiment of the present application also provides a wireless communication system, including: a terminal and a network side device, wherein the terminal can be used to execute the steps of the terminal side channel feedback method as described above, and the network side device can be used to execute the steps of the network side device channel feedback method as described above.

[0416] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0417] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0418] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A channel feedback method, comprising: The terminal receives first information from a network side device, where the first information is determined based on at least part of the second information obtained by uplink channel measurement; The terminal performs downlink channel measurement based on the first information to obtain first channel feedback information; The terminal sends second channel feedback information to the network side device, where the second channel feedback information is determined based on at least part of the first channel feedback information; The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, and the first multipath parameter is a multipath parameter of an uplink channel.

2. The method according to claim 1, wherein: The terminal performs downlink channel measurement based on the first information, and obtains first channel feedback information including: The terminal performs downlink channel measurement based on the first information and third information sent by the network side device; The terminal determines first channel feedback information according to at least one of the first information and the third information and a measurement result of the downlink channel measurement; The third information includes at least one of the following: The network side device is used to obtain array configuration information of the second information; Signal configuration information for downlink channel measurement; Location information of network-side devices; Physical antenna array information of network-side devices.

3. The method according to claim 1 or 2, wherein: The first channel feedback information includes at least one of the fourth information and the fifth information; Among them, the fourth information is feedback information associated with communication, and the fifth information is feedback information associated with perception.

4. The method according to claim 3, wherein: The second channel feedback information satisfies at least one of the following: The second channel feedback information includes at least part of the information in the fourth information, or includes an index corresponding to a value obtained by quantizing at least part of the information in the fourth information; The second channel feedback information includes at least part of the information in the fifth information, or includes an index corresponding to a value after quantization of at least part of the information in the fifth information.

5. The method according to claim 3, wherein: The fourth information includes at least one of the following: Complex amplitude of multipath in downlink channel; A mapping relationship between the complex amplitude of the multipath of the downlink channel and at least one of the subarray of the network side device or the signal configuration information for downlink channel measurement; a mapping relationship between the complex amplitude of the downlink channel multipath and at least one item of the third information; The first vector and the first vector and the subarray of the network side device or the signal configuration information for downlink channel measurement A mapping relationship of at least one item in the information; A second vector and a mapping relationship between the second vector and at least one of the subarray of the network side device or the signal configuration information for downlink channel measurement; A downlink channel estimation matrix and a mapping relationship between the downlink channel estimation matrix and at least one of the subarrays of the network side device or signal configuration information for downlink channel measurement; A covariance matrix of a downlink channel estimation matrix and a mapping relationship between the covariance matrix and at least one item of a subarray of the network side device or signal configuration information for downlink channel measurement; A correlation matrix of a downlink channel estimation matrix and a mapping relationship between the correlation matrix and at least one item of a subarray of the network side device or signal configuration information for downlink channel measurement.

6. The method according to claim 5, further comprising: The terminal determines the first vector according to a measured value of a complex amplitude of at least one downlink channel multipath and a target multipath parameter; The target multipath parameter is at least one multipath parameter in the first channel feedback information corresponding to the complex amplitude of the row channel multipath.

7. The method according to claim 6, wherein: The terminal determines the first vector according to the measured value of the complex amplitude of at least one downlink channel multipath and the target multipath parameter, including: The terminal calculates a steering vector according to the target multipath parameter; The terminal performs weighted combination of the measured value of the complex amplitude of the at least one downlink channel multipath and the steering vector to obtain the first vector.

8. The method according to claim 5, further comprising: The terminal determines the second vector according to a measured value of a complex amplitude of at least one downlink channel multipath and information other than the complex amplitude of the downlink channel multipath in the first channel feedback information.

9. The method according to claim 8, wherein: The terminal determines the second vector according to the measured value of the complex amplitude of at least one downlink channel multipath and information other than the complex amplitude of the downlink channel multipath in the first channel feedback information, including: The terminal calculates a downlink channel estimation matrix according to a measured value of a complex amplitude of at least one downlink channel multipath, information other than the complex amplitude of the downlink channel multipath in the first channel feedback information, and a channel model assumption; The terminal performs a target operation to obtain a second vector; The target operation includes any of the following: Performing singular decomposition on the downlink channel estimation matrix; Perform eigenvalue decomposition on a covariance matrix or a correlation matrix of the downlink channel estimation matrix.

10. The method according to claim 3, wherein: The fifth information includes at least one of the following: A second multipath parameter, where the second multipath parameter is a multipath parameter of a downlink channel; The measured value of the perceived measurement quantity; Perceived results; Measurement values ​​of perceptual performance evaluation indicators.

11. The method according to any one of claims 3 to 10, wherein: The second channel feedback information further includes channel feedback indication information, where the channel feedback indication information is used to indicate at least one of the following: The feedback content type of the fourth information; The feedback content type of the fifth information.

12. The method according to any one of claims 1 to 11, before the terminal receives the first information from the network side device, the method further comprises: The terminal sends sixth information to the network side device, where the sixth information is used to assist the uplink channel measurement.

13. The method according to any one of claims 1 to 12, wherein: The multipath parameters include at least one of the complex amplitude of the multipath, the time delay of the multipath, the angle of the multipath, the near-field and far-field information, the first-hop multipath distance and the last-hop multipath distance; Among them, the far-field and near-field information is used to indicate the far-field and near-field relationship between the multipath and the first set, and the first set is a subarray set of all subarrays of the network side device, in which the signal propagation path between the network side device and the terminal includes the multipath; the first-hop multipath distance is the distance between the first-hop reflection point or scattering point of the multipath and the preset reference point of the network side device; the last-hop multipath distance is the distance between the last-hop reflection point or scattering point of the multipath and the preset reference point of the terminal.

14. The method according to any one of claims 1 to 13, wherein: The mapping relationship between the first multipath parameter and the subarray of the network side device includes any one of the following: a mapping relationship between the first multipath parameter and a first index, where the first index is an index of a subarray of the network-side device; A mapping relationship between the first multipath parameter and first configuration information, where the first configuration information is antenna configuration information of a subarray of the network side device; a mapping relationship between the first multipath parameter and a target array and an antenna port, wherein the target array is a physical antenna array array corresponding to a subarray of a network-side device; The mapping relationship between the first multipath parameter and the target formation and antenna configuration information.

15. The method according to any one of claims 1 to 14, wherein: The first information satisfies at least one of the following: The first information is at least part of the second information; The first information is an index corresponding to a value obtained by quantizing at least part of the second information.

16. A channel feedback method, comprising: The network side device performs uplink channel measurement to obtain second information; The network side device sends first information to the terminal, where the first information is determined based on at least part of the second information, and the first information is used to perform downlink channel measurement; The network side device receives second channel feedback information from the terminal, where the second channel feedback information is determined based on at least part of the first channel feedback information obtained by measuring the downlink channel; The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, and the first multipath parameter is a multipath parameter of an uplink channel.

17. The method according to claim 16, further comprising: The network side device sends third information to the terminal, where the third information is used to perform the downlink channel measurement in conjunction with the first information; The third information includes at least one of the following: The network side device is used to obtain array configuration information of the second information; Signal configuration information for downlink channel measurement; Location information of network-side devices; Physical antenna array information of network-side devices.

18. The method according to claim 16 or 17, wherein: The second channel feedback information includes at least one of the fourth information and the fifth information; Among them, the fourth information is feedback information associated with communication, and the fifth information is feedback information associated with perception.

19. The method according to claim 18, wherein: The second channel feedback information satisfies at least one of the following: The second channel feedback information includes at least part of the information in the fourth information, or includes an index corresponding to a value obtained by quantizing at least part of the information in the fourth information; The second channel feedback information includes at least part of the information in the fifth information, or includes an index corresponding to a value after quantization of at least part of the information in the fifth information.

20. The method according to claim 18, wherein: The fourth information includes at least one of the following: Complex amplitude of multipath in downlink channel; A mapping relationship between the complex amplitude of the multipath of the downlink channel and at least one of the subarray of the network side device or the signal configuration information for downlink channel measurement; a mapping relationship between the complex amplitude of the downlink channel multipath and at least one item of the third information; A first vector and a mapping relationship between the first vector and at least one of the subarray of the network side device or signal configuration information for downlink channel measurement; A second vector and a mapping relationship between the second vector and at least one of the subarray of the network side device or the signal configuration information for downlink channel measurement; A downlink channel estimation matrix and a mapping relationship between the downlink channel estimation matrix and at least one of the subarrays of the network side device or signal configuration information for downlink channel measurement; A covariance matrix of a downlink channel estimation matrix and a mapping relationship between the covariance matrix and at least one item of a subarray of the network side device or signal configuration information for downlink channel measurement; A correlation matrix of a downlink channel estimation matrix and a mapping relationship between the correlation matrix and at least one item of a subarray of the network side device or signal configuration information for downlink channel measurement.

21. The method according to claim 18, wherein: The fifth information includes at least one of the following: A second multipath parameter, where the second multipath parameter is a multipath parameter of a downlink channel; The measured value of the perceived measurement quantity; Perceived results; Measurement values ​​of perceptual performance evaluation indicators.

22. The method according to any one of claims 18 to 21, wherein: The second channel feedback information further includes at least one of the following: The feedback content type of the fourth information; The feedback content type of the fifth information.

23. The method according to any one of claims 16 to 22, before the network side device performs uplink channel measurement to obtain the second information, the method further comprises: The network side device receives sixth information from the terminal, where the sixth information is used to assist the uplink channel measurement.

24. The method according to any one of claims 16 to 23, wherein: The multipath parameters include at least one of the complex amplitude of the multipath, the time delay of the multipath, the angle of the multipath, the near-field and far-field information, the first-hop multipath distance and the last-hop multipath distance; Among them, the far-field and near-field information is used to indicate the far-field and near-field relationship between the multipath and the first set, and the first set is a subarray set of all subarrays of the network side device, in which the signal propagation path between the network side device and the terminal includes the multipath; the first-hop multipath distance is the distance between the first-hop reflection point or scattering point of the multipath and the preset reference point of the network side device; the last-hop multipath distance is the distance between the last-hop reflection point or scattering point of the multipath and the preset reference point of the terminal.

25. The method according to any one of claims 16 to 24, wherein: The mapping relationship between the first multipath parameter and the subarray of the network side device includes any one of the following: a mapping relationship between the first multipath parameter and a first index, where the first index is an index of a subarray of the network-side device; A mapping relationship between the first multipath parameter and first configuration information, where the first configuration information is antenna configuration information of a subarray of the network side device; a mapping relationship between the first multipath parameter and a target array and an antenna port, wherein the target array is a physical antenna array array corresponding to a subarray of a network-side device; The mapping relationship between the first multipath parameter and the target formation and antenna configuration information.

26. The method according to any one of claims 16 to 25, wherein: The first information satisfies at least one of the following: The first information is at least part of the second information; The first information is an index corresponding to a value obtained by quantizing at least part of the second information.

27. A channel feedback device, comprising: A first receiving module, configured to receive first information from a network side device, where the first information is determined based on at least part of the second information obtained by uplink channel measurement; Perform downlink channel measurement based on the first information to obtain first channel feedback information; A first sending module, configured to send second channel feedback information to a network side device, where the second channel feedback information is determined based on at least part of the first channel feedback information; The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, and the first multipath parameter is a multipath parameter of an uplink channel.

28. A channel feedback device, comprising: A second receiving module, used for performing uplink channel measurement to obtain second information; A second sending module, configured to send first information to a terminal, where the first information is determined based on at least part of the second information, and the first information is used to perform downlink channel measurement; The second receiving module is further configured to receive second channel feedback information from the terminal, where the second channel feedback information is determined based on at least part of the first channel feedback information obtained by measuring the downlink channel; The second information includes a first multipath parameter and a mapping relationship between the first multipath parameter and a subarray on the network device side, and the first multipath parameter is a multipath parameter of an uplink channel.

29. A terminal comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the channel feedback method according to any one of claims 1 to 15 are implemented.

30. A network side device, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the channel feedback method according to any one of claims 16 to 26 are implemented.

31. A readable storage medium storing a program or an instruction, wherein the program or the instruction, when executed by a processor, implements the steps of the channel feedback method according to any one of claims 1 to 26.

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