Wireless communication method and apparatus, and device

Abstract

The present application belongs to the field of communications. Disclosed are a wireless communication method and apparatus, and a device. The wireless communication method in the embodiments of the present application comprises: a terminal obtaining a first measurement result by means of measuring first downlink signals of at least two candidate cells which are forwarded by a relay device; and the terminal transmitting first information to the relay device or to a network-side device on the basis of the first measurement result, wherein the first information comprises at least one of the following: the first measurement result and identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of a first candidate cell, a result obtained by means of processing the signal quality corresponding to all the first downlink signals of the first candidate cell, an identifier of a target cell which corresponds to a backhaul link of the relay device and is expected by the terminal, an identifier of a target transceiving beam which corresponds to the backhaul link of the relay device and is expected by the terminal, an identifier of a first downlink signal transmitted by the target cell which corresponds to the backhaul link of the relay device and is expected by the terminal, and whether the terminal expects the relay device to perform cooperative transmission.

Description

Wireless communication method, device and equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on January 3, 2024, with application number 202410015062.3 and invention name “Wireless Communication Methods, Devices and Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communications, and more specifically, to a wireless communication method, apparatus, and device. Background Art

[0004] Currently, in shared antenna architectures, relay devices (such as network controlled repeaters (NCRs)) assume that the control link (C-link) and the backhaul link (backhaul link) operate in the same frequency band and that the C-link and backhaul link channels are quasi-co-located. This means that the C-link's transmit and receive beams can be used for backhaul link signal transmission and reception, and that the C-link's channel measurement results (such as the cell's signal quality measurement results) represent the backhaul link's channel quality. The backhaul link can then forward signals based on the cell and beam selected by the C-link. However, for some shared antenna architectures and independent antenna architectures, the C-link and backhaul link channels no longer meet the quasi-co-location assumption. Therefore, the C-link's channel measurement results (such as the cell's signal quality measurement results) cannot represent the backhaul link's channel quality. Therefore, the C-link's receive beam configuration cannot be used to determine the backhaul link's transmit and receive beams.

[0005] For some shared antenna architectures and independent antenna architectures, how to determine the optimal cell and optimal transmit and receive beam corresponding to the backhaul link of the relay device is a problem that needs to be solved. Summary of the Invention

[0006] The embodiments of the present application provide a wireless communication method, apparatus, and device, by which a terminal can determine, through measurement, the identifier of a target base station corresponding to the backhaul link of a relay device, the identifier of a target cell corresponding to the backhaul link of the relay device, the identifier or index of a target transceiver beam corresponding to the backhaul link of the relay device, or an indication of whether the relay device participates in collaborative transmission, thereby solving the problem of being unable to determine the optimal cell and optimal transceiver beam corresponding to the backhaul link of the relay device.

[0007] In a first aspect, a wireless communication method is provided, comprising:

[0008] The terminal obtains a first measurement result by measuring first downlink signals of at least two candidate cells forwarded by the relay device; wherein the first measurement result includes at least one of the following: a signal quality corresponding to each first downlink signal of each candidate cell, and a processed result of the signal quality corresponding to all first downlink signals of each candidate cell;

[0009] The terminal sends first information to the relay device or the network side device according to the first measurement result;

[0010] The first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the processed signal quality result corresponding to all first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, and whether the terminal expects cooperative transmission of the relay device;

[0011] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0012] In a second aspect, a wireless communication method is provided, including:

[0013] The network side device receives first information from the terminal;

[0014] The first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each first downlink signal of the first candidate cell, a processed result of the signal qualities corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a first downlink signal sent by a target cell corresponding to a backhaul link of the relay device desired by the terminal, and whether the terminal desires cooperative transmission of the relay device;

[0015] The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality corresponding to all first downlink signals of each candidate cell;

[0016] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0017] According to a third aspect, a wireless communication method is provided, including:

[0018] The relay device receives first information from the terminal;

[0019] The first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each first downlink signal of the first candidate cell, a processed result of the signal qualities corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a first downlink signal sent by a target cell corresponding to a backhaul link of the relay device desired by the terminal, and whether the terminal desires cooperative transmission of the relay device;

[0020] The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality corresponding to all first downlink signals of each candidate cell;

[0021] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0022] According to a fourth aspect, a wireless communication device is provided, including:

[0023] a processing unit, configured to obtain a first measurement result by measuring first downlink signals of at least two candidate cells forwarded by the relay device; wherein the first measurement result includes at least one of the following: a signal quality corresponding to each first downlink signal of each candidate cell, and a processed result of the signal quality corresponding to all first downlink signals of each candidate cell;

[0024] a transceiver unit, configured to send first information to the relay device or the network side device according to the first measurement result;

[0025] The first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the processed signal quality result corresponding to all first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the wireless communication device, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the wireless communication device, the identifier or index of the first downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the wireless communication device, and whether the wireless communication device expects the relay device to cooperate in transmission;

[0026] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0027] According to a fifth aspect, a wireless communication device is provided, including:

[0028] a transceiver unit, configured to receive first information from a terminal;

[0029] The first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each first downlink signal of the first candidate cell, a processed result of the signal qualities corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a first downlink signal sent by a target cell corresponding to a backhaul link of the relay device desired by the terminal, and whether the terminal desires cooperative transmission of the relay device;

[0030] The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality corresponding to all first downlink signals of each candidate cell;

[0031] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0032] According to a sixth aspect, a wireless communication device is provided, including:

[0033] a transceiver unit, configured to receive first information from a terminal;

[0034] The first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each first downlink signal of the first candidate cell, a processed result of the signal qualities corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the wireless communication device desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the wireless communication device desired by the terminal, an identifier or index of a first downlink signal sent by a target cell corresponding to a backhaul link of the wireless communication device desired by the terminal, and whether the terminal desires cooperative transmission of the wireless communication device;

[0035] The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality corresponding to all first downlink signals of each candidate cell;

[0036] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0037] In a seventh aspect, a terminal is provided, comprising a transceiver, a processor, and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of the method described in the first aspect are implemented.

[0038] In an eighth aspect, a terminal is provided, comprising a processor and a communication interface;

[0039] The processor is configured to obtain a first measurement result by measuring first downlink signals of at least two candidate cells forwarded by the relay device; wherein the first measurement result includes at least one of the following: a signal quality corresponding to each first downlink signal of each candidate cell, and a processed result of the signal quality corresponding to all first downlink signals of each candidate cell;

[0040] The communication interface is used to send first information to the relay device or the network side device according to the first measurement result;

[0041] The first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the processed signal quality result corresponding to all first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, and whether the terminal expects cooperative transmission of the relay device;

[0042] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0043] In the ninth aspect, a network side device is provided, which includes a transceiver, 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.

[0044] In a tenth aspect, a network-side device is provided, including a processor and a communication interface;

[0045] Wherein, the communication interface is used to receive first information from the terminal;

[0046] The first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each first downlink signal of the first candidate cell, a processed result of the signal qualities corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a first downlink signal sent by a target cell corresponding to a backhaul link of the relay device desired by the terminal, and whether the terminal desires cooperative transmission of the relay device;

[0047] The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality corresponding to all first downlink signals of each candidate cell;

[0048] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0049] In the eleventh aspect, a relay device is provided, which includes a transceiver, 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 third aspect are implemented.

[0050] In a twelfth aspect, a relay device is provided, including a processor and a communication interface;

[0051] Wherein, the communication interface is used to receive first information from the terminal;

[0052] The first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each first downlink signal of the first candidate cell, a processed result of the signal qualities corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a first downlink signal sent by a target cell corresponding to a backhaul link of the relay device desired by the terminal, and whether the terminal desires cooperative transmission of the relay device;

[0053] The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality corresponding to all first downlink signals of each candidate cell;

[0054] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0055] In the thirteenth 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, or the steps of the method described in the third aspect are implemented.

[0056] In the fourteenth aspect, a wireless communication system is provided, including: a terminal, a relay device and a network side device, wherein the terminal can be used to execute the steps of the method described in the first aspect, the network side device can be used to execute the steps of the method described in the second aspect, and the relay device can be used to execute the steps of the method described in the third aspect.

[0057] In the fifteenth aspect, a chip is provided, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the method as described in the first aspect, or the method as described in the second aspect, or the method as described in the third aspect.

[0058] In the sixteenth aspect, a computer program / program product is provided, which is stored in a storage medium and is executed by at least one processor to implement the steps of the wireless communication method as described in any one of the first to third aspects.

[0059] In an embodiment of the present application, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal determines and reports at least one of the following to the relay device or the network side device based on the first measurement result: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0060] Alternatively, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal reports at least one of the following to the relay device or the network side device: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell; thereby, the relay device or the network side device can determine at least one of the following based on the information reported by the terminal: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects the relay device to cooperate in transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0062] FIG1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

[0063] FIG2 is a schematic diagram of an NCR sharing architecture provided in an embodiment of the present application.

[0064] FIG3 is a schematic diagram of the transceiver side under an NCR sharing architecture provided in an embodiment of the present application.

[0065] FIG4 is a schematic diagram of the transceiver side under an NCR independent architecture provided in an embodiment of the present application.

[0066] FIG5 is a schematic diagram of the transceiver side under an NCR partial sharing architecture provided in an embodiment of the present application.

[0067] FIG6 is a schematic diagram of a RIS partial sharing architecture provided in an embodiment of the present application.

[0068] FIG7 is a schematic flowchart of a wireless communication method provided according to an embodiment of the present application.

[0069] FIG8 is a schematic diagram of a transmission period of a first downlink signal and a beam scanning period of a relay device provided according to an embodiment of the present application.

[0070] FIG9 is a schematic diagram of a phase diagram of a first downlink signal corresponding to a cascade channel and a phase diagram of a first downlink signal corresponding to a direct channel provided according to an embodiment of the present application.

[0071] FIG10 is a schematic flowchart of determining a serving cell of a relay device according to an embodiment of the present application.

[0072] Figure 11 is a schematic diagram of another transmission period of a first downlink signal and a beam scanning period of a relay device provided according to an embodiment of the present application.

[0073] FIG12 is a schematic flowchart of another method for determining a serving cell of a relay device according to an embodiment of the present application.

[0074] FIG13 is a schematic flowchart of another method for determining a serving cell of a relay device according to an embodiment of the present application.

[0075] FIG14 is a schematic block diagram of a wireless communication device provided according to an embodiment of the present application.

[0076] FIG15 is a schematic block diagram of another wireless communication device provided according to an embodiment of the present application.

[0077] FIG16 is a schematic block diagram of another wireless communication device provided according to an embodiment of the present application.

[0078] Figure 17 is a schematic block diagram of a communication device provided according to an embodiment of the present application.

[0079] FIG18 is a schematic diagram of the hardware structure of a terminal provided according to an embodiment of the present application.

[0080] Figure 19 is a schematic block diagram of a network-side device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0081] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0082] 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.

[0083] 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.

[0084] It is worth noting that the technology described in the embodiments of the present application is not limited to the Internet of Things (IoT) system, but can also be used in other wireless communication systems, such as Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, 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), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), Bluetooth systems, or other systems. In the embodiments of the present application, the terms "system" and "network" 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 example purposes, and NR terminology is used in most of the following description, but these techniques can also be applied to systems other than NR systems, such as 6G (6 th Generation, 6G) communication system.

[0085] 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, vehicle-mounted controller, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or 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.

[0086] The network side device 12 may include an access network device or a core network device.

[0087] Access network equipment can also be referred to as radio access network (RAN) equipment, radio access network functions, or radio access network units. Access network equipment can include base stations, wireless local area network (WLAN) access points (AS), or wireless fidelity (WiFi) nodes. 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 relevant 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.

[0088] Among them, 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 ( Function, AF), Network Data Analytics Function (NWDAF), Location Management Function (LMF), etc. It should be noted that in the embodiment 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.

[0089] The relay device described in the embodiment of the present application is a Layer 1 relay (Layer 1 / L1 relay or Layer 1 / L1 repeater). Optionally, the specific implementation method may include but is not limited to: an NCR device, a reconfigurable intelligent surface (RIS) device, or a backscatter device, etc., a communication device or communication auxiliary device that does not demodulate the wireless signal.

[0090] In order to facilitate a better understanding of the embodiments of the present application, the NR NCR related to the present application is explained.

[0091] As a relay node, the NCR can forward and amplify signals from the base station or UE, effectively acting as a signal amplifier. The NCR can receive control signaling from an upstream base station (donor). In other words, the base station can control the NCR's transmission parameters, such as the receive or transmit beams between the NCR and the base station, or between the NCR and the UE. Signal amplifiers are widely used in applications such as extending cell coverage.

[0092] For example, in the network structure shown in Figure 2, there are three network nodes. The middle network node is an NCR device, which includes a mobile termination module (MT) and a forwarding unit (Fwd). The MT can establish a connection with an upstream base station (via a control link (C-link)). The base station transmits control signaling to the NCR through the MT, which can control the transmission / reception related parameters (including power, amplification factor, beam, on / off parameters, etc.) between the NCR and the base station (such as the backhaul link (BH)) or between the NCR and the UE (such as the access link (AL)).

[0093] It should be noted that the forward link (Forward link) may include a backhaul link (BH) and an access link (AL).

[0094] At this stage, NCR assumes that the C-link and the backhaul link operate in the same frequency band, and assumes that the channel of the C-link and the channel of the backhaul link meet the quasi-co-location condition, that is, the transceiver beam of the C-link can be used for backhaul link signal transmission and reception, and the channel measurement result of the C-link (for example, the signal quality measurement result of the cell) represents the channel quality of the backhaul link. NCR forwards signals based on the cell and the selected beam selected by the signal quality measurement result of the C-link. From the hardware architecture point of view, as shown in Figure 3, NCR assumes that the backhaul link and the control link share the transceiver antenna, so as to ensure that the above assumptions can be established. It should be noted that the backhaul link and control link sharing architecture shown in Figure 3 is only an example and does not constitute a limitation to this application. For example, in the backhaul link and control link sharing architecture, the sending side can also include other numbers of sending units, and the receiving side can also include other numbers of receiving units, and this application does not limit this.

[0095] The NCR implementation architecture can also be an architecture in which the control link and the backhaul link are separated.

[0096] A possible independent architecture can be shown in Figure 4 . The control link operates in a low-frequency band (e.g., FR1) and uses independent transmit and receive antennas and radio frequency links to access cells in the low-frequency band. The forward link operates in a high-frequency band (e.g., FR2) and forwards high-frequency wireless signals, improving high-frequency signal coverage. Because the control link and backhaul link operate in different frequency bands, the antennas and radio frequency links used are deployed independently. The low-frequency band, FR1, has strong reflection and diffraction capabilities, multiple transmission paths, and strong coverage, ensuring robust communication quality between the control link and the base station. The high-frequency band has short wavelengths and smaller antennas, significantly increasing antenna deployment density and achieving higher beamforming gain. On the other hand, high-frequency band signals have poor reflection and diffraction capabilities, are easily obscured, and have fewer transmission paths. Therefore, the NCR backhaul link needs to determine its serving cell based on the multipath propagation of the high-frequency channel. It should be noted that the independent backhaul link and control link architecture shown in Figure 4 is merely an example and does not limit the present application. For example, in a backhaul link and control link separation architecture, the sending side may further include other numbers of sending units, and the receiving side may further include other numbers of receiving units, which is not limited in this application.

[0097] A possible architecture for partially sharing the backhaul link and control link can be shown in Figure 5. The NCR antenna array is composed of an arrangement of active units and passive units. The MT control module connects the active units on the transmitting side and the active units on the receiving side. The number of active units on the transmitting side is less than the number of passive units, and the number of active units on the receiving side is less than the number of passive units. The MT control module is used to access the network to obtain control signaling and report measurement results to the base station. The backhaul link and access link adjust the working status of the passive units according to the control information of the MT control module to form the receiving and transmitting beams of the backhaul link and access link. It should be noted that the architecture for partially sharing the backhaul link and control link shown in Figure 5 is only an example and does not constitute a limitation to this application. For example, in the architecture for partially sharing the backhaul link and control link, the transmitting side may also include other numbers of active units and passive units, and the receiving side may also include other numbers of active units and passive units. This application does not limit this.

[0098] Another possible partially shared architecture is suitable for hardware implementation of RIS devices. As shown in Figure 6, the antenna elements of the control module and the RIS passive elements in the RIS device together form the RIS element array. The RIS control module is used to access the network, obtain control signaling, and report measurement results to the base station. The control module's antenna elements are very few, far fewer than the passive elements in the RIS element array. The RIS control module provides control signals to control the phase and amplitude of the wireless signal reflected or transmitted by each passive element in the RIS element array. The reflected / transmitted signals from a large number of RIS passive elements are superimposed to form a beam, enhancing signal quality in a specific area. Because the number of active elements is very small, the impact of the RIS forwarding signal beam gain is negligible. It can be understood that the signal forwarding behavior (reflection or transmission) of the RIS passive element is equivalent to the combined behavior of the NCR device's backhaul link antenna receiving signal and the access link transmitting signal. The backhaul link receive beam and access link transmit beam are equivalent to the forwarding beam of the RIS element array. Configuring the backhaul link receive beam or access link beam is equivalent to configuring the forwarding beam of the RIS element array. It should be noted that the partially shared architecture for RIS devices shown in FIG6 is merely an example and does not limit the present application. For example, the partially shared architecture for RIS devices may include other numbers of active units and passive units, and the present application does not limit this.

[0099] In summary, the antenna architectures of NCR or RIS devices can be categorized as shared, partially shared, and independent. Currently, 5G standards only address NCR devices with shared architectures. The NCR backhaul link (the channel from the base station to the NCR) reuses the transmit and receive beams of the control link (the channel from the base station to the NCR control module) or selects from a set of candidate control link beams. By default, the control link selects the cell serving the NCR forward link (i.e., forwards signals from that cell).

[0100] While the shared antenna architecture described above makes standardization relatively simple, it increases the complexity and cost of device hardware implementation. When the number of antenna units in an NCR or RIS is large, the complexity and cost of the shared antenna architecture increase significantly. Therefore, as NCR or RIS equipment evolves and upgrades, some shared antenna architectures and independent antenna architectures may appear in wireless networks to reduce hardware complexity and cost, requiring corresponding standardization.

[0101] Based on the above description, under the assumptions of partial shared antenna architectures and independent antenna architectures, serving cell selection and backhaul link beam selection for NCR or RIS differ from those in shared antenna architectures. The control link signal and backhaul link channel no longer meet the quasi-co-location assumption. The channel quality of each cell measured by the control link cannot represent the received signal quality of the backhaul link. Therefore, the control link transmit and receive beam configuration cannot be used for the backhaul link transmit and receive beam configuration.

[0102] Based on the above technical problems, the present application proposes a relay communication solution, in which the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal determines and reports at least one of the following to the relay device or the network side device based on the first measurement result: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device. Alternatively, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal reports at least one of the following to the relay device or the network side device: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell; thereby, the relay device or the network side device can determine at least one of the following based on the information reported by the terminal: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects the relay device to cooperate in transmission.

[0103] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and all of them fall within the scope of protection of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0104] FIG7 is a schematic flowchart of a wireless communication method 200 according to an embodiment of the present application. As shown in FIG7 , the wireless communication method 200 may include at least part of the following contents:

[0105] S210: The terminal obtains a first measurement result by measuring first downlink signals of at least two candidate cells forwarded by a relay device; wherein the first measurement result includes at least one of the following: a signal quality corresponding to each first downlink signal of each candidate cell, and a processed signal quality result corresponding to all first downlink signals of each candidate cell;

[0106] S220, the terminal sends first information to the relay device or the network side device based on the first measurement result; wherein, the first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects cooperative transmission of the relay device; wherein, the first candidate cell is a candidate cell whose signal quality obtained by measuring the first downlink signal is better than a first threshold among the at least two candidate cells;

[0107] S230: The relay device or the network-side device receives the first information.

[0108] It should be understood that FIG7 shows the steps or operations of the wireless communication method 200, but these steps or operations are merely examples, and the embodiments of the present application may also perform other operations or variations of the operations in FIG7.

[0109] The candidate cells described in the embodiments of the present application may also be referred to as candidate base stations, candidate transmission and reception points (TRP) of multiple candidate cells, multiple candidate TRPs of one cell, candidate access points (AP), candidate collaborative base stations, candidate collaborative TRPs, candidate collaborative APs, etc., which can be interchangeable, and the embodiments of the present application are not limited to this.

[0110] Exemplarily, the at least two candidate cells may also be referred to as at least two base stations of the candidate cells, or at least two TRPs within a cell. The at least two base stations of the candidate cells or the at least two TRPs each transmit a first downlink signal. In the case of at least two TRPs, the network side selects a target TRP, the MT module of the relay device establishes a link with the target TRP, and determines the uplink and downlink timing of the relay device's forward link with reference to the downlink timing and uplink timing of the target TRP.

[0111] The first candidate cell described in the embodiments of the present application may be one or more candidate cells. For example, if there are multiple candidate cells in at least two candidate cells whose signal quality obtained by measuring the first downlink signal is better than a first threshold, the first candidate cell may be multiple candidate cells. For another example, if there are multiple candidate cells in at least two candidate cells whose signal quality obtained by measuring the first downlink signal is better than a first threshold, the first candidate cell may be a candidate cell selected from the multiple candidate cells that meet the first threshold.

[0112] Exemplarily, the processed signal quality results corresponding to all first downlink signals of each candidate cell include:

[0113] The maximum value obtained after processing (such as sorting from large to small) of the signal qualities corresponding to all the first downlink signals of each candidate cell, or the value exceeding the predefined threshold, or the maximum value obtained after processing (such as sorting from large to small after weighting) of the signal qualities corresponding to all the first downlink signals of each candidate cell, or the value exceeding the predefined threshold, or the various values ​​obtained after weighted processing of the signal qualities corresponding to all the first downlink signals of each candidate cell.

[0114] The signal quality described in the embodiments of the present application can be characterized by at least one of the following:

[0115] Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), and path loss.

[0116] Optionally, the network side device is a base station or TRP or AP corresponding to one of the at least two candidate cells, or, the network side device is a base station or TRP or AP corresponding to a cell other than the at least two candidate cells, or, the network side device is a base station or TRP or AP corresponding to the service cell of the terminal.

[0117] Optionally, the network side device may also be a core network device or a third-party device, which is not limited in this application.

[0118] It should be noted that the target cell is determined from at least two candidate cells. If the terminal expects relay device cooperative transmission, the target cell can be the cell to which the terminal expects the relay device to forward signals. The target cell is determined from at least two candidate TRPs. If the terminal expects relay device cooperative transmission, the target cell can be the TRP to which the terminal expects the relay device to forward signals.

[0119] Exemplarily, whether the terminal expects cooperative transmission of the relay device can be indicated by 1 bit; wherein, a value of 0 indicates that the terminal expects cooperative transmission of the relay device, and a value of 1 indicates that the terminal does not expect cooperative transmission of the relay device; or, a value of 1 indicates that the terminal expects cooperative transmission of the relay device, and a value of 0 indicates that the terminal does not expect cooperative transmission of the relay device.

[0120] In some embodiments, when the first information includes at least one of the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and a processed result of the signal quality corresponding to all first downlink signals of the first candidate cell, the network-side device or the relay device determines at least one of the following based on the first information:

[0121] The identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0122] In an embodiment of the present application, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal determines and reports at least one of the following to the relay device or the network side device based on the first measurement result: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0123] Or, in an embodiment of the present application, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal reports at least one of the following to the relay device or the network side device: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell; thereby, the relay device or the network side device can determine at least one of the following based on the information reported by the terminal: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects the relay device to cooperate in transmission.

[0124] In some embodiments, there may be at least two terminals assisting in the measurement, and the information reported by each terminal is the same as the first information reported by the terminal. In this case, the network-side device or the relay device determines at least one of the following based on the information reported by the at least two terminals:

[0125] The identifier of the target cell corresponding to the return link of the relay device, the identifier or index of the target transceiver beam corresponding to the return link of the relay device, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device, and whether the relay device needs collaborative transmission.

[0126] It should be noted that the information reported by each terminal is the same as the first information reported by the above terminal and can be understood as having the same format or type, but the specific parameter values ​​may be the same or different.

[0127] Exemplarily, the principle by which a terminal or a network-side device or a relay device determines the target cell corresponding to the return link of the relay device desired by the terminal is: for the i-th candidate cell, based on the measurement results of multiple first downlink signals of the i-th candidate cell, one of the measurement results or multiple weighted measurement results are selected as the signal quality of the i-th candidate cell; the signal quality of each candidate cell is compared to determine the target cell (i.e., the serving cell) corresponding to the return link of the relay device, for example, the candidate cell with the best signal quality is selected as the target cell; further, the first downlink signal with the best signal quality is selected according to the measurement results of the first downlink signal of the target cell, and then, the target transceiver beam corresponding to the return link of the relay device is determined based on the identifier or index of the first downlink signal with the best quality.

[0128] The specific difference is: when making decisions on the terminal side, it can only make judgments based on local measurement results and only report the judgment results, so the feedback overhead is small. However, the measurement results of a single terminal may be biased and cannot represent the needs of all terminals; the network side or relay side can collect the measurement results of at least two terminals for judgment, and the judgment results are more accurate, but the terminal needs to report multiple channel measurement results, and the feedback overhead is large.

[0129] In some embodiments, the first downlink signal may include but is not limited to at least one of the following:

[0130] Synchronization Signal Block (SSB), Channel State Information Reference Signal (CSI-RS), Tracking Reference Signal (TRS), Positioning Reference Signal (PRS), and protocol-defined dedicated reference signals.

[0131] In some embodiments, the relay device can be a communication device or communication auxiliary device that does not demodulate wireless signals, such as an NCR, RIS, or backscatter device. Alternatively, the NCR can have an independent control link and backhaul link architecture, as shown in Figure 4 ; or, the NCR can have a partially shared control link and backhaul link architecture, as shown in Figure 5 . Alternatively, the RIS can have an independent architecture, or, alternatively, a partially shared architecture, as shown in Figure 6 .

[0132] For example, for a partially shared architecture, the active and passive units of the RIS device or NCR partially share an antenna array. Therefore, the control link can perform cell searches on the same carrier, access a cell based on the signal conditions of the active unit, and obtain downlink time-frequency synchronization. The candidate base station or candidate TRP or candidate AP on the network side (which may require the assistance of the RIS device or NCR to improve coverage or traffic) obtains relevant information of the RIS device or NCR (such as identification, index of transmit and receive beams, etc.) through the inter-station interface. The active unit of the RIS device or NCR can respectively determine the downlink transmit beam from the candidate base station to the RIS device or NCR (for example, the control link measures the SSB of each candidate base station respectively and determines the optimal beam for each candidate base station); it should be noted that the downlink transmit beam on the network side can be obtained through control link measurement, but the downlink receive beam of the NCR / RIS backhaul link cannot be determined through the control link.

[0133] Illustratively, the terminal measures the signal quality of a first downlink signal from at least two candidate cells forwarded by a RIS device or NCR. The terminal, network-side device, RIS device, or NCR determines a suitable serving cell for the RIS device or NCR based on the measured signal quality. The network-side device schedules the control link of the RIS device or NCR to access the serving cell to receive forward link scheduling information.

[0134] Optionally, in an embodiment of the present application, the cell accessed by the control link may be one of at least two candidate cells, for example, the control link and the forward link operate in the same frequency band, and the control link accesses one of the at least two candidate cells; the cell accessed by the control link may not belong to at least two candidate cells, for example, the control link accesses a low-frequency band cell, and the forward link serves a high-frequency band cell.

[0135] Optionally, the first threshold is agreed upon by a protocol, or the first threshold is configured by the network side.

[0136] In some embodiments, the network-side device may schedule the control link of the relay device to access the target cell corresponding to the backhaul link of the relay device. For example, the network-side device schedules the control link to access the target cell / serving cell / target TRP of the backhaul link based on the terminal reporting result, obtains time-frequency synchronization, reads the corresponding backhaul link scheduling information, and determines the uplink and downlink timing of the forward link according to the uplink timing and downlink timing of the target cell / serving cell / target TRP.

[0137] In some embodiments, the criterion for determining that a terminal in the coverage area of ​​a relay device (such as a RIS device or NCR) requires the relay device to assist in transmission may be that the signal quality of the beam of the relay device (such as a RIS device or NCR) exceeds the signal quality from the base station to the terminal, or, the criterion for determining a terminal in the coverage area of ​​a relay device (such as a RIS device or NCR) may be that the signal quality of the beam of the relay device (such as a RIS device or NCR) exceeds a preset threshold. In other words, terminals that meet the above criteria participate in the service cell selection-related process of the relay device (such as a RIS device or NCR), and terminals that meet the above criteria can configure the assistance of the relay device to improve communication quality. That is, in an embodiment of the present application, the signal quality of the beam of the relay device (such as a RIS device or NCR) exceeds the signal quality from the base station to the terminal, or, the signal quality of the beam of the relay device (such as a RIS device or NCR) exceeds a preset threshold.

[0138] In some embodiments, when measuring the signal quality of the first downlink signals of at least two candidate cells, the terminal needs to consider the transmission delay differences of different candidate cells. For example, the terminal's measurement process for at least two candidate cells can continue to use the multi-cell SSB signal quality measurement function or the multi-cell downlink signal measurement function based on Time Difference of Arrival (TDOA) positioning; or, under a partially shared hardware architecture, the control link measures the downlink frame boundary difference of at least two candidate cells, reports it to the network, and then configures it to the terminal for downlink signal measurement or uplink signal transmission timing adjustment. Optionally, the first downlink signals of at least two candidate cells can be reference signals such as SSB signals or CSI-RS signals of each candidate cell, which are sent to a relay device (such as a RIS device or NCR) within a time window using time division, frequency division, or code division and then forwarded to the terminal. It can be understood that within the above time window, the transmit and receive beams and channel amplification factors of the relay device (such as a RIS device or NCR) remain unchanged.

[0139] In some embodiments, the above S220 may specifically include:

[0140] When the terminal determines that the relay device participates in the cooperative transmission, the terminal sends the first information to the relay device or the network side device; or

[0141] In the case that the terminal determines that the relay device does not participate in the cooperative transmission, the terminal sends the first information to the relay device or the network side device, and the first information at least includes whether the terminal expects the relay device to participate in the cooperative transmission.

[0142] Exemplarily, when the terminal determines that the relay device participates in collaborative transmission, the terminal sends the first information to the relay device or the network side device; when the terminal determines that the relay device does not participate in collaborative transmission, the terminal does not send the first information to the relay device or the network side device.

[0143] Exemplary triggering conditions for the terminal to report the first information:

[0144] If the terminal determines that a relay device (such as a RIS device or NCR) is required to assist in transmission, it reports its own signal measurement results or cell selection results; otherwise, it does not report the measurement results or only feeds back the determination result that a relay device (such as a RIS device or NCR) is not required to assist in transmission.

[0145] In some embodiments, whether the terminal expects the relay device to cooperate in transmission includes:

[0146] When the signal quality of the forward link cascade channels corresponding to some or all of the at least two candidate cells is lower than the signal quality of the direct connection channels from the candidate cells to the terminal, the terminal does not expect the relay device to cooperate in transmission; or

[0147] When the signal quality of the cascade channel corresponding to some or all of the at least two candidate cells is better than or equal to the signal quality of the direct channel, the terminal expects the relay device to cooperate in transmission; or

[0148] When the signal quality of the direct connection channels corresponding to some or all of the at least two candidate cells is better than a second threshold, the terminal does not expect the relay device to cooperate in transmission; or

[0149] When the signal quality of the direct connection channels corresponding to some or all of the at least two candidate cells is lower than a second threshold, the terminal expects the relay device to cooperate in transmission; or

[0150] In a case where the signal quality of the concatenated channels corresponding to some or all of the at least two candidate cells is better than a third threshold, the terminal expects the relay device to cooperate in transmission; or

[0151] When the signal quality of the concatenated channels corresponding to some or all of the at least two candidate cells is lower than a third threshold, the terminal does not expect the relay device to cooperate in transmission;

[0152] Among them, among the at least two candidate cells, the signal quality of the cascade channel corresponding to the i-th candidate cell represents the signal quality of the i-th candidate cell-the relay device-the terminal, and the signal quality of the direct channel corresponding to the i-th candidate cell represents the signal quality of the i-th candidate cell-the terminal.

[0153] Exemplarily, the above conditions for determining whether the terminal expects the relay device to cooperate with the transmission may also be combined. For example, whether the terminal expects the relay device to cooperate with the transmission includes at least one of the following:

[0154] When the signal quality of the cascaded channels corresponding to some or all of the at least two candidate cells is lower than the signal quality of the direct channel, the terminal does not expect the relay device to cooperate in transmission;

[0155] When signal quality of the concatenated channels corresponding to some or all of the at least two candidate cells is better than or equal to signal quality of the direct channel, the terminal expects the relay device to cooperate in transmission;

[0156] When the signal quality of the direct connection channels corresponding to some or all of the at least two candidate cells is better than a second threshold, the terminal does not expect the relay device to cooperate in transmission;

[0157] When signal quality of direct connection channels corresponding to some or all of the at least two candidate cells is lower than a second threshold, the terminal expects the relay device to cooperate in transmission;

[0158] When signal quality of the concatenated channels corresponding to some or all of the at least two candidate cells is better than a third threshold, the terminal expects the relay device to cooperate in transmission;

[0159] In a case where the signal quality of the concatenated channels corresponding to some or all of the at least two candidate cells is lower than a third threshold, the terminal does not expect the relay device to cooperate in transmission.

[0160] Optionally, the second threshold is agreed upon by a protocol, or the second threshold is configured by the network side.

[0161] Optionally, the third threshold is agreed upon by a protocol, or the third threshold is configured by the network side.

[0162] For example, the terminal can determine whether it desires cooperative transmission with a relay device (i.e., whether the terminal desires signal forwarding by the relay device) based on the signal quality of the cascaded channel and the signal quality of the direct channel. For example, if the signal quality of the direct channel is sufficiently good, or the signal quality of the cascaded channel is much lower than that of the direct channel, this indicates that the relay device does not significantly improve the signal quality of the terminal and that the relay device's assistance is not required.

[0163] In some embodiments, a measurement time window associated with the signal quality of the cascade channel corresponding to the i-th candidate cell is different from a measurement time window associated with the signal quality of the direct channel corresponding to the i-th candidate cell. Thus, the terminal can measure the signal quality of the cascade channel and the signal quality of the direct channel in different measurement time windows.

[0164] In some embodiments, the phase information associated with the signal quality of the cascade channel corresponding to the i-th candidate cell is different from the phase information associated with the signal quality of the direct channel corresponding to the i-th candidate cell. Thus, the terminal can measure the signal quality of the cascade channel and the signal quality of the direct channel at different phases.

[0165] Exemplarily, each of at least two candidate cells transmits a first downlink signal. The terminal measures the first downlink signals of the at least two candidate cells forwarded by the relay device to obtain a first measurement result. The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality result of all first downlink signals of each candidate cell. The signal quality may be the RSRP, SINR, RSRQ, or pathloss of the first downlink signal. The first measurement result represents the signal quality of the cascaded channel between the base station, relay device, and terminal. Furthermore, optionally, the terminal measures the signal quality of the direct channel between the base station and the terminal. A specific measurement method includes, for example, the candidate cell transmitting the first downlink signal at a time outside the relay device's beam training window, i.e., during a time period when the relay device does not forward signals, for the terminal to measure the signal quality of the direct channel. Alternatively, the network configures a specific time window in the relay device's beam training cycle to correspond to a time period when the relay device does not forward signals, such as the first time window or the last time window. The terminal uses the measurement result of the first downlink signal within the specific time window as the signal quality of the direct channel, as shown in FIG8 . Alternatively, for a first downlink signal of two or more symbols, the relay device uses the same beam with different phases on each symbol of the first downlink signal (for example, the forwarding phase of the two symbols before and after is rotated 180 degrees) to forward the signal. The terminal receives the first downlink signal and determines the signal quality of the cascade channel and the signal quality of the direct channel respectively according to the phase change, as shown in Figure 9.

[0166] In some embodiments, each of the at least two candidate cells uses its own target downlink transmit beam to transmit a first downlink signal multiple times, and a backhaul link of the relay device uses a different receive beam and the same transmit beam to forward the first downlink signals transmitted multiple times by each candidate cell, wherein the target downlink transmit beam of each candidate cell is a transmit beam directed toward the relay device. Optionally, the target downlink transmit beam of each candidate cell is measured via a control link of the relay device.

[0167] Exemplarily, when measuring the signal quality of at least two candidate cells, the base station of each candidate cell uses a target downlink transmit beam (i.e., a fixed downlink transmit beam) to transmit a first downlink signal multiple times. The relay device (e.g., a RIS device or NCR) forwards the first downlink signal of each candidate cell using at least two different backhaul link receive beams and the same access link transmit beam according to network-side scheduling, as shown in FIG10 . The terminal, network-side device, or relay device determines the optimal backhaul beam for the relay device (e.g., a RIS device or NCR) to forward the signal of the candidate cell based on the signal quality of multiple first downhaul signals of the same candidate cell (e.g., measured by channel state information (CSI)). The terminal, network-side device, or relay device also determines the optimal backhaul beam for the relay device (e.g., a RIS device or NCR) to forward the signal of the candidate cell. The terminal, network-side device, or relay device also determines the serving cell of the forward link based on the signal quality of the optimal backhaul beam of the relay devices (e.g., a RIS device or NCR) corresponding to different candidate cells.

[0168] In some embodiments, each candidate cell can configure the parameters of the first downlink signal (for example, the cell identifier (ID) corresponding to each first downlink signal, the time-frequency parameters and pilot sequence parameters corresponding to each first downlink signal, etc.) for a terminal (a terminal participating in the cell selection process of a relay device (such as an NCR or RIS device)). The terminal is a terminal under the coverage area of ​​the target downlink transmission beam of the candidate cell, wherein the target downlink transmission beam is a downlink transmission beam pointing to the relay device (such as an NCR or RIS device) and is obtained through control link measurement. Optionally, the first downlink signal of each candidate cell is assumed to be quasi-co-located with the target downlink transmission beam of each candidate cell.

[0169] In some embodiments, among at least two candidate cells, the downlink timing adjustment amount of the i-th candidate cell is the difference between the downlink timing of the i-th candidate cell and the downlink timing of the serving cell obtained by control link measurement of the relay device.

[0170] Exemplarily, the network side can configure an adjustment amount for the downlink timing of each candidate cell for the terminal. For example, the adjustment amount represents the deviation of the downlink timing of base station 1 relative to the downlink timing of base station 2, where base station 2 is the base station of the cell currently accessed by the terminal, base station 2 is the base station of another adjacent cell, and both base stations 1 and 2 can be candidate cooperative base stations for a relay device (such as an NCR or RIS device). The adjustment amount is the difference between the downlink timings of base stations 1 and 2, as measured by the control link of the relay device (such as an NCR or RIS device).

[0171] In some embodiments, a downlink signal of each of the at least two candidate cells satisfies at least one of the following:

[0172] They have the same transmission power, the same power density, and the same bandwidth.

[0173] It can be understood that transmission power = power density * signal bandwidth.

[0174] Exemplarily, the first downlink signals transmitted by each candidate cell have the same transmit power or power density and the same bandwidth. If the power or bandwidth of each first downlink signal is different, it is necessary to notify the terminal during the configuration phase of the first downlink signal. The terminal performs compensation when measuring the first downlink signal, or performs weighted correction when selecting a serving cell or access cell of a relay device (such as an NCR or RIS device) based on the measurement results.

[0175] In some embodiments, a relay device (e.g., an NCR or RIS device) obtains backhaul link beam training configuration from a base station in a serving cell or access cell, including backhaul link beam scanning duration and period, and access link beam configuration. The relay device (e.g., an NCR or RIS device) forwards the first downlink signal using a fixed access link transmit beam and backhaul link beam scanning.

[0176] In some embodiments, each of the at least two candidate cells periodically sends a set of first downlink signals through beam scanning, and the return link of the relay device uses different receiving beams and the same transmitting beam to forward the set of first downlink signals periodically sent by each candidate cell.

[0177] In some embodiments, each of the at least two candidate cells has the same period for sending the first downlink signal; the time window period associated with the return link of the relay device is the same as the period for each candidate cell to send the first downlink signal, or the time window period associated with the return link of the relay device is an integer multiple of the period for each candidate cell to send the first downlink signal.

[0178] For example, for a hardware architecture in which active units and passive units are deployed independently, the candidate cell cannot determine the transmission beam of the base station in the candidate cell through the control link of a relay device (such as a RIS device or an NCR). The first downlink signal of each candidate cell needs to be sent using a wide beam or a group of first downlink signals needs to be sent in a beam scanning manner.

[0179] Optionally, the network side configures the terminal to measure the first downlink signal sent by each candidate cell, configures the cell ID of each candidate cell, the sending period and time-frequency position of the first downlink signal. It can be understood that the sending period of the first downlink signal of each candidate cell is the same. Therefore, the beam training window period of the backhaul link of the relay device (such as a RIS device or an NCR) is the same as the sending period of the first downlink signal, or the beam training window period of the backhaul link of the relay device (such as a RIS device or an NCR) is an integer multiple of the sending period of the first downlink signal. Exemplarily, the beam training window period of the backhaul link of the relay device (such as a RIS device or an NCR) and the sending period of the first downlink signal can be as shown in Figure 11.

[0180] In some embodiments, after sending the first information, the wireless communication method 200 further includes:

[0181] The terminal obtains a second measurement result by measuring the second downlink signals of the at least two candidate cells forwarded by the relay device, where the second measurement result includes at least one of the following: a signal quality corresponding to each second downlink signal of each candidate cell, and a processed result of the signal qualities corresponding to all second downlink signals of each candidate cell;

[0182] The terminal sends second information to the relay device or the network side device according to the second measurement result;

[0183] The second information includes at least one of the following: the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, the processed result of the signal quality corresponding to all second downlink signals of the second candidate cell, the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects the relay device to cooperate in transmission;

[0184] The second candidate cell is a candidate cell of the at least two candidate cells, wherein the signal quality obtained by measuring the second downlink signal is better than a fourth threshold;

[0185] The relay device determines the forwarding beam for each candidate cell based on the first measurement result in the first information and the identifiers of the at least two candidate cells. It can be understood that the terminal measures the first downlink signals of at least two candidate cells and reports the first message as the first round of measurement.

[0186] In this embodiment, after the terminal performs the first round of measurements, the network side device or the relay device can determine the forwarding beam of the relay device for the second round based on the results of the first round of measurements. Each candidate cell sends a second downlink signal in turn, and is forwarded by the corresponding forwarding beam, so that at least one of the following can be determined more accurately: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects the relay device to cooperate in transmission.

[0187] In this embodiment, in the above S210, the forwarding beam used by the relay device when forwarding the first downlink signals of at least two candidate cells is randomly generated by the relay device.

[0188] The second candidate cell described in the embodiments of the present application may be one or more candidate cells. For example, if there are multiple candidate cells in at least two candidate cells whose signal quality obtained by measuring the second downlink signal is greater than a fourth threshold, the second candidate cell may be multiple candidate cells. For another example, if there are multiple candidate cells in at least two candidate cells whose signal quality obtained by measuring the second downlink signal is greater than a fourth threshold, the second candidate cell may be a candidate cell selected from the multiple candidate cells that meet the fourth threshold.

[0189] For example, the forwarding beam is a backhaul link beam and an access link beam for the NCR, and is a RIS pattern for the RIS device. Under different RIS patterns, the RIS unit (active RIS unit or passive RIS unit) has different working states.

[0190] In some embodiments, each candidate cell of the at least two candidate cells uses a target downlink transmit beam to transmit a second downlink signal, and a backhaul link of the relay device uses a forwarding beam corresponding to an i-th candidate cell of the at least two candidate cells to forward the second downlink signal transmitted by the i-th candidate cell;

[0191] The forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the processed signal quality corresponding to all first downlink signals of the i-th candidate cell.

[0192] In some embodiments, the second downlink signal may include but is not limited to at least one of the following:

[0193] SSB, CSI-RS, TRS, PRS.

[0194] It should be noted that the configuration requirements for the second downlink signal are similar to those for the first downlink signal. For details, please refer to the description of the first downlink signal. For the sake of brevity, they are not repeated here. For example, the configuration parameters of the transmit power, power density, or channel bandwidth of the first downlink signal may be reused; the same transmit beam as the first downlink signal may be used.

[0195] In some embodiments, when the second information includes at least one of the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, and a processed result of the signal quality corresponding to all second downlink signals of the second candidate cell, the network-side device or the relay device determines at least one of the following based on the second information:

[0196] The identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects cooperative transmission of the relay device.

[0197] In some embodiments, there may be at least two terminals assisting in the measurement, and the information reported by each terminal is the same as the second information reported by the terminal. In this case, the network-side device or the relay device determines at least one of the following based on the information reported by the at least two terminals:

[0198] The identifier of the target cell corresponding to the return link of the relay device, the identifier or index of the target transceiver beam corresponding to the return link of the relay device, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device, and whether the relay device needs collaborative transmission.

[0199] It should be noted that the information reported by each terminal is the same as the second information reported by the above terminal and can be understood as having the same format or type, but the specific parameter values ​​may be the same or different.

[0200] In some embodiments, the technical solution of the present application can also be applied to the uplink process. For the uplink process, the terminal sends multiple uplink signals. The relay device (such as a RIS device or NCR) uses the same access receive beam and different backhaul transmit beams to forward the uplink signals. At least two candidate cells measure the uplink signal quality. Each candidate cell determines the optimal backhaul beam for the corresponding relay device (such as a RIS device or NCR). The optimal forward link serving cell is determined based on the uplink signal quality of the backhaul beam selected by each candidate cell.

[0201] For example, the cell selection process based on uplink measurement signals is similar to the downlink process, with the difference being that each candidate cell receives and measures the uplink measurement signal and directly determines the target cell, eliminating the need for UE measurement reporting, as shown in Figure 12. However, for the uplink measurement process, since the UE's transmit power is weaker than the base station's transmit power, the accuracy of the uplink measurement will be lower than that of the downlink signal. The uplink measurement signal needs to be measured in each candidate cell, and since the uplink timing requirements of each candidate cell may be different, this will also affect the measurement accuracy of the uplink measurement signal. It is understood that the terminal can send uplink measurement signals to each candidate cell separately (it is necessary to ensure that the uplink measurement signals sent separately use the same uplink transmit beam, and optionally adjust the uplink transmission timing of each uplink measurement signal based on the different timing advance (TA) measurement results of each candidate cell); or only send one uplink measurement signal, and each candidate cell performs measurement on the same time resource (the uplink timing deviation is compensated by each candidate cell according to the reception algorithm).

[0202] In an embodiment of the present application, the service cell of the RIS device or NCR can be determined based on UE-assisted measurement, which is applicable to layer 1 relay devices with partial hardware sharing or independent hardware architecture, and solves the problem that the control link of the layer 1 relay cannot determine the backhaul link transceiver beam.

[0203] Therefore, in an embodiment of the present application, the terminal obtains a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal determines and reports at least one of the following to the relay device or the network side device based on the first measurement result: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0204] Or, in an embodiment of the present application, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal reports at least one of the following to the relay device or the network side device: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell; thereby, the relay device or the network side device can determine at least one of the following based on the information reported by the terminal: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects the relay device to cooperate in transmission.

[0205] After determining the target cell or target TRP of the relay device, the network side device schedules the control link of the relay device to perform cell switching (for example, a non-competitive random access process) to access the base station of the target cell, or performs beam switching to establish a link with the target TRP, and determines the downlink timing and uplink timing with the target cell or target TRP as a reference point. Furthermore, the control link obtains the control signaling of the forward link from the target cell or target TRP, forwards the downlink signal of the target cell or target TRP, or forwards the uplink signal of the terminal to the target cell or target TRP.

[0206] The technical solution of this application is described below through Examples 1 to 3.

[0207] In embodiment 1, corresponding to a partially hardware shared architecture, the UE-assisted NCR / RIS backhaul link cell selection and beam training process may specifically include some or all of the following steps S1-1 to S1-5.

[0208] S1-1. The candidate collaborative base station configures the parameters of the downlink measurement signal (for example, the cell ID corresponding to each downlink measurement signal, the time-frequency parameters of the measurement signal, the pilot sequence parameters, etc.) for the auxiliary UE (the UE participating in the NCR / RIS cell selection process). The auxiliary UE is a terminal under the coverage area of ​​the target downlink transmission beam of the candidate collaborative base station (the target downlink transmission beam is a downlink transmission beam pointing to the NCR / RIS, obtained through control link measurement). The downlink measurement signal includes the downlink measurement signal of each of the candidate collaborative base stations, and the downlink measurement signal of each of the candidate collaborative base stations is assumed to be quasi-co-located with the target downlink transmission beam of each of the candidate collaborative base stations.

[0209] Optionally, the network configures the downlink timing adjustment amount of each candidate collaborative base station for the UE. The adjustment amount represents the deviation of the downlink timing of base station 1 relative to the downlink timing of base station 2, where base station 2 is the cell currently accessed by the UE, base station 2 is another adjacent cell, and both base station 1 and base station 2 can be NCR / RIS candidate collaborative base stations. The adjustment amount is the difference in downlink timing between base station 1 and base station 2 measured by the NCR / RIS control link. It can be understood that the deviation value of the downlink timing can be expressed in units of sampling periods. When the sampling periods of the candidate base stations are different, the sampling period of one of the base stations is selected as the unit of the deviation value according to a predetermined rule. For example, the sampling period corresponding to the base station currently accessed by the control link is selected as the unit.

[0210] It is understood that the downlink measurement signals transmitted by each candidate cooperative base station have the same transmit power or power density and the same bandwidth. If the power or bandwidth of each downlink measurement signal is different, it is necessary to notify the terminal during the measurement signal configuration phase. The terminal performs compensation during signal measurement or makes weighted corrections when selecting a RIS / NCR access cell based on the measurement results.

[0211] S1-2. The NCR / RIS obtains the backhaul link beam training configuration from the base station of the access cell, including the backhaul link beam scanning duration and period, and the access link beam configuration. The NCR / RIS uses a fixed access link transmit beam and backhaul link beam scanning to forward downlink measurement signals.

[0212] S1-3. Each candidate collaborative base station sends a downlink measurement signal respectively, and the UE determines the measurement result. The measurement result is the RSRP or SINR or RSRQ or pathloss of the downlink measurement signal. The measurement result represents the signal quality of the cascade channel of the base station-NCR / RIS-terminal; further optionally, the UE measures the signal quality of the direct channel of the base station-UE. The specific measurement method, for example, the candidate collaborative base station sends a downlink measurement signal at other times outside the RIS / NCR beam training window, that is, during the time period when the RIS / NCR does not forward signals, for the terminal to measure the signal quality of the direct channel. Alternatively, the network configures one of the windows of the RIS / NCR beam training period to correspond to the RIS / NCR not forwarding signals, such as the first window or the last window, and the terminal uses the downlink signal measurement result in the window as the signal quality of the direct channel. Alternatively, for a downlink measurement signal of two or more symbols, RIS / NCR uses the same beam with different phases on each symbol of the downlink measurement signal (for example, the forwarding phase of the two symbols before and after is rotated 180 degrees) to forward the signal. The terminal receives the downlink measurement signal and determines the signal quality of the cascade channel and the signal quality of the direct channel respectively according to the phase change.

[0213] S1-4. The UE reports information, including at least one of the following: measurement results, base station / TRP selection results, whether RIS / NCR collaboration is required, the collaborative base station cell ID corresponding to the RIS / NCR, and the backhaul link beam selection result.

[0214] The principle by which a terminal or network determines the service cell of a RIS / NCR is as follows: based on the measurement results of multiple measurement signals of a candidate collaborative base station, one measurement result / or multiple measurement results are selected and weighted as the signal quality of the candidate collaborative base station; the signal quality of each candidate collaborative base station is compared to determine the target collaborative base station (i.e., the service cell) of the RIS / NCR, for example, the candidate collaborative base station with the best signal quality is selected as the target collaborative base station; based on the measurement results of the measurement signals of the target collaborative base station, the measurement signal with the best signal quality is selected to further determine the transmit and receive beams of the backhaul link of the RIS / NCR. The difference between the two is that when the terminal side makes a decision, it can only make judgments based on local measurement results and only report the judgment results, resulting in less feedback overhead; the network side can collect the measurement results of multiple terminals for judgment, and the judgment results are more accurate and fair, but the terminal needs to report multiple channel measurement results, resulting in greater feedback overhead.

[0215] Optionally, the terminal determines whether NCR / RIS is required for signal forwarding based on the signal quality of the cascaded channel and the signal quality of the direct channel. This means that if the signal quality of the direct channel is sufficiently good, or if the signal quality of the cascaded channel is significantly lower than that of the direct channel, RIS / NCR will not significantly improve the terminal's signal quality and therefore does not require its assistance. The triggering conditions for the terminal to report measurement results: If the terminal determines that RIS / NCR assistance is required for transmission, it reports its own signal measurement results or cell selection results; otherwise, it does not report measurement results or only reports the determination that RIS / NCR assistance is not required for transmission.

[0216] S1-5. The base station schedules the target cooperative base station / serving cell for the control link to access the backhaul link according to the UE reporting result, obtains time-frequency synchronization, and reads the corresponding backhaul link scheduling information.

[0217] In embodiment 2, corresponding to the RIS partial hardware sharing architecture, the UE-assisted RIS backhaul link cell selection and beam training process may be as shown in FIG13 , which may specifically include some or all of the following steps S2-1 to S2-5.

[0218] S2-1. The candidate collaborative base station configures the parameters of the downlink measurement signal (for example, the cell ID corresponding to each downlink measurement signal, the time-frequency parameters of the measurement signal, the pilot sequence parameters, etc.) for the auxiliary UE (the UE participating in the NCR / RIS cell selection process). The auxiliary UE is a terminal under the coverage area of ​​the target downlink transmission beam of the candidate collaborative base station (the target downlink transmission beam is a downlink transmission beam pointing to the NCR / RIS, obtained through control link measurement). The downlink measurement signal includes the downlink measurement signal of each of the candidate collaborative base stations, and the downlink measurement signal of each of the candidate collaborative base stations is assumed to be quasi-co-located with the target downlink transmission beam of each of the candidate collaborative base stations.

[0219] Optionally, the network configures an adjustment value for the downlink timing of each candidate coordinated base station for the UE. The adjustment value represents the deviation of the downlink timing of base station 1 relative to the downlink timing of base station 2, where base station 2 is the cell the UE is currently accessing and base station 2 is another adjacent cell. Both base stations 1 and 2 can be NCR / RIS candidate coordinated base stations. The adjustment value is the difference between the downlink timings of base stations 1 and 2 measured by the RIS control link.

[0220] It is understood that the downlink measurement signals sent by each candidate cooperative base station have the same transmit power or power density and the same bandwidth. If the power or bandwidth of each downlink measurement signal is different, it is necessary to notify the terminal during the measurement signal configuration phase. The terminal compensates during signal measurement or performs weighted correction when selecting a RIS / NCR access cell based on the measurement results.

[0221] S2-2. The RIS device sequentially uses multiple randomly generated RIS patterns to forward the downlink measurement signal of each candidate cooperative base station.

[0222] S2-3. The UE generates a statistically optimized RIS pattern based on the measurement results of multiple downlink measurement signals sent by the same candidate cooperative base station; or the UE reports the downlink measurement results to the base station or RIS, which then generates the statistically optimized RIS pattern. Specifically, a statistically optimized RIS pattern is generated for each candidate cooperative base station.

[0223] S2-4. The base station schedules the RIS to operate using the statistically optimized RIS pattern and sends a downlink measurement signal again, and the UE measures the downlink measurement signal. It is understandable that the statistically optimized RIS pattern corresponding to different candidate collaborative base stations is different. Different RIS patterns are configured for the RIS in different time periods, and the corresponding candidate collaborative base stations send downlink measurement signals. The UE measures the signal quality of the downlink measurement signal of each candidate collaborative base station respectively; determines the optimal candidate collaborative base station and reports the determination result, or reports the signal quality measurement results of each candidate collaborative base station, and the network selects the optimal candidate collaborative base station.

[0224] S2-5. The base station schedules the control link to access the target cooperative base station / serving cell of the backhaul link, obtains time-frequency synchronization, and reads the corresponding backhaul link scheduling information.

[0225] It can be understood that the combination of the NCR's backhaul link receive beam and the access link transmit beam corresponds to the RIS pattern of the RIS device. In the above process, the randomly generated RIS pattern corresponds to the randomly generated beams of the backhaul link and the access link.

[0226] Example 3, for the independent hardware architecture of NCR or RIS equipment, the UE-assisted NCR backhaul link cell selection and beam training process, when the candidate base station sends the first downlink signal according to the beam scan in each NCR backhaul link window, the terminal measures the first downlink signal of the base station beam scan separately to determine the signal quality of each candidate base station in each NCR backhaul link window. For example, the optimal value or weighted value of the signal quality in each transmitting beam of the candidate base station. The terminal determines the first information based on the signal quality of each backhaul link window of the candidate base station. The first information includes the beam identifier in the beam scan of the candidate base station and the corresponding signal quality. The network side can determine the target cell, the transmitting beam of the target cell (one of the beams in the beam scan), and the receiving beam of the relay based on the first information.

[0227] The wireless communication method provided in the embodiments of the present application may be performed by a wireless communication device or a processing unit in the wireless communication device for performing the wireless communication method. The embodiments of the present application take the wireless communication device performing the wireless communication method as an example to illustrate the wireless communication device provided in the embodiments of the present application.

[0228] FIG14 shows a schematic block diagram of a wireless communication device 300 according to an embodiment of the present application. As shown in FIG14 , the wireless communication device 300 includes:

[0229] The processing unit 310 is configured to obtain a first measurement result by measuring first downlink signals of at least two candidate cells forwarded by the relay device; wherein the first measurement result includes at least one of the following: a signal quality corresponding to each first downlink signal of each candidate cell, and a processed signal quality result corresponding to all first downlink signals of each candidate cell;

[0230] The transceiver unit 320 is configured to send first information to the relay device or the network side device according to the first measurement result;

[0231] The first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the processed signal quality result corresponding to all first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the wireless communication apparatus 300, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the wireless communication apparatus 300, the identifier or index of the first downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the wireless communication apparatus 300, and whether the wireless communication apparatus 300 expects the relay device to cooperate in transmission;

[0232] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0233] In some embodiments, the transceiver unit 320 is specifically configured to:

[0234] When the wireless communication apparatus 300 determines that the relay device participates in the cooperative transmission, the first information is sent to the relay device or the network side device; or

[0235] When the wireless communication apparatus 300 determines that the relay device does not participate in cooperative transmission, the first information is sent to the relay device or the network side device, and the first information at least includes whether the wireless communication apparatus 300 expects the relay device to cooperate in transmission.

[0236] In some embodiments, whether the wireless communication apparatus 300 expects the relay device to cooperate in transmission includes:

[0237] In a case where the signal quality of the cascaded channels corresponding to some or all of the at least two candidate cells is lower than the signal quality of the direct channel, the wireless communication apparatus 300 does not expect the relay device to cooperate in transmission; or

[0238] In a case where the signal quality of the cascaded channels corresponding to some or all of the at least two candidate cells is better than or equal to the signal quality of the direct channel, the wireless communication apparatus 300 expects the relay device to cooperate in transmission; or

[0239] When the signal quality of the direct connection channels corresponding to some or all of the at least two candidate cells is better than a second threshold, the wireless communication apparatus 300 does not expect the relay device to cooperate in transmission; or

[0240] When the signal quality of the direct connection channels corresponding to some or all of the at least two candidate cells is lower than a second threshold, the wireless communication apparatus 300 expects the relay device to cooperate in transmission; or

[0241] In a case where the signal quality of the cascaded channels corresponding to some or all of the at least two candidate cells is better than a third threshold, the wireless communication apparatus 300 expects the relay device to cooperate in transmission; or

[0242] When the signal quality of the concatenated channels corresponding to some or all of the at least two candidate cells is lower than a third threshold, the wireless communication apparatus 300 does not expect the relay device to cooperate in transmission;

[0243] Among them, among the at least two candidate cells, the signal quality of the cascade channel corresponding to the i-th candidate cell represents the signal quality of the i-th candidate cell-the relay device-the wireless communication device 300, and the signal quality of the direct channel corresponding to the i-th candidate cell represents the signal quality of the i-th candidate cell-the wireless communication device 300.

[0244] In some embodiments, a measurement time window associated with the signal quality of the cascade channel corresponding to the i-th candidate cell is different from a measurement time window associated with the signal quality of the direct channel corresponding to the i-th candidate cell; or

[0245] Phase information associated with the signal quality of the cascade channel corresponding to the i-th candidate cell is different from phase information associated with the signal quality of the direct channel corresponding to the i-th candidate cell.

[0246] In some embodiments, each of the at least two candidate cells uses its own target downlink transmit beam to transmit the first downlink signal multiple times, and the return link of the relay device uses different receive beams and the same transmit beam to forward the first downlink signals transmitted multiple times by each candidate cell, wherein the target downlink transmit beam of each candidate cell is a transmit beam pointing to the relay device.

[0247] In some embodiments, among the at least two candidate cells, the downlink timing adjustment amount of the i-th candidate cell is the difference between the downlink timing of the i-th candidate cell and the downlink timing of the serving cell obtained by control link measurement of the relay device.

[0248] In some embodiments, a downlink signal of each candidate cell of the at least two candidate cells satisfies at least one of the following:

[0249] They have the same transmission power, the same power density, and the same bandwidth.

[0250] In some embodiments, each of the at least two candidate cells periodically sends a group of first downlink signals through beam scanning, and the return link of the relay device uses different receiving beams and the same transmitting beam to forward the group of first downlink signals periodically sent by each candidate cell.

[0251] In some embodiments, each candidate cell in the at least two candidate cells has the same period for sending the first downlink signal;

[0252] The time window period associated with the return link of the relay device is the same as the period for each candidate cell to send the first downlink signal, or the time window period associated with the return link of the relay device is an integer multiple of the period for each candidate cell to send the first downlink signal.

[0253] In some embodiments, after sending the first information, the processing unit 310 is further configured to obtain a second measurement result by measuring the second downlink signals of the at least two candidate cells forwarded by the relay device, where the second measurement result includes at least one of the following: a signal quality corresponding to each second downlink signal of each candidate cell, and a processed result of the signal quality corresponding to all second downlink signals of each candidate cell;

[0254] The transceiver unit 320 is further configured to send second information to the relay device or the network side device according to the second measurement result;

[0255] The second information includes at least one of the following: the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, the processed signal quality result corresponding to all second downlink signals of the second candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the wireless communication apparatus 300, the identifier or index of the second downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the wireless communication apparatus 300, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the wireless communication apparatus 300, and whether the wireless communication apparatus 300 expects the relay device to cooperate in transmission;

[0256] The second candidate cell is a candidate cell of the at least two candidate cells whose signal quality obtained by measuring the second downlink signal is better than a fourth threshold;

[0257] The forwarding beam of the relay device for each candidate cell is determined based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

[0258] In some embodiments, each of the at least two candidate cells uses the target downlink transmit beam to transmit the second downlink signal multiple times, and the backhaul link of the relay device uses the forwarding beam corresponding to the i-th candidate cell among the at least two candidate cells to forward the second downlink signal sent by the i-th candidate cell;

[0259] The forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the processed signal quality corresponding to all first downlink signals of the i-th candidate cell.

[0260] In some embodiments, the transceiver unit 320 may be a communication interface or transceiver, or an input / output interface of a communication chip or a system on a chip. The processing unit 310 may be embedded in or independent of a processor of the terminal in the form of hardware.

[0261] It should be understood that the wireless communication device 300 according to the embodiment of the present application may correspond to the terminal in the method embodiment of the present application, and the various units in the wireless communication device 300 are respectively for implementing the corresponding processes of the terminal in the method 200 shown in Figure 7. For the sake of brevity, they will not be repeated here.

[0262] Therefore, in an embodiment of the present application, the terminal obtains a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal determines and reports at least one of the following to the relay device or the network side device based on the first measurement result: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0263] Or, in an embodiment of the present application, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal reports at least one of the following to the relay device or the network side device: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell; thereby, the relay device or the network side device can determine at least one of the following based on the information reported by the terminal: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects the relay device to cooperate in transmission.

[0264] FIG15 shows a schematic block diagram of a wireless communication device 400 according to an embodiment of the present application. As shown in FIG15 , the wireless communication device 400 includes:

[0265] The transceiver unit 410 is configured to receive first information from a terminal;

[0266] The first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each first downlink signal of the first candidate cell, a processed result of the signal qualities corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a first downlink signal sent by a target cell corresponding to a backhaul link of the relay device desired by the terminal, and whether the terminal desires cooperative transmission of the relay device;

[0267] The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality corresponding to all first downlink signals of each candidate cell;

[0268] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0269] In some embodiments, when the first information includes at least one of the first measurement result and identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and a processed result of the signal quality corresponding to all first downlink signals of the first candidate cell, the wireless communication apparatus 400 further includes:

[0270] The processing unit 420 is configured to determine at least one of the following based on the first information:

[0271] The identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0272] In some embodiments, after receiving the first information, the transceiver unit 410 is further configured to receive second information from the terminal;

[0273] The second information includes at least one of the following: a second measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each second downlink signal of the second candidate cell, a processed result of the signal qualities corresponding to all second downlink signals of the second candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a second downlink signal sent by a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the relay device desired by the terminal, and whether the terminal expects cooperative transmission of the relay device;

[0274] The second measurement result includes at least one of the following: the signal quality corresponding to each second downlink signal of each candidate cell, and the processed signal quality corresponding to all second downlink signals of each candidate cell;

[0275] The second candidate cell is a candidate cell of the at least two candidate cells whose signal quality obtained by measuring the second downlink signal is better than a fourth threshold;

[0276] The forwarding beam of the relay device for each candidate cell is determined based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

[0277] In some embodiments, each of the at least two candidate cells uses the target downlink transmit beam to transmit the second downlink signal multiple times, and the backhaul link of the relay device uses the forwarding beam corresponding to the i-th candidate cell among the at least two candidate cells to forward the second downlink signal sent by the i-th candidate cell;

[0278] The forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the processed signal quality corresponding to all first downlink signals of the i-th candidate cell.

[0279] In some embodiments, when the second information includes at least one of the second measurement result and identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, and a processed result of the signal quality corresponding to all second downlink signals of the second candidate cell, the wireless communication apparatus 400 further includes:

[0280] The processing unit 420 is configured to determine at least one of the following based on the second information:

[0281] The identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0282] In some embodiments, the wireless communication device 400 further includes:

[0283] The processing unit 420 is configured to schedule the control link of the relay device to access a target cell corresponding to the backhaul link of the relay device.

[0284] In some embodiments, the transceiver unit 410 may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip.

[0285] It should be understood that the wireless communication device 400 according to the embodiment of the present application may correspond to the network side device in the method embodiment of the present application, and the various units in the wireless communication device 400 are respectively for implementing the corresponding processes of the network side device in the method 200 shown in Figure 7. For the sake of brevity, they will not be repeated here.

[0286] Therefore, in an embodiment of the present application, the terminal obtains a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal determines and reports at least one of the following to the relay device based on the first measurement result: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0287] Or, in an embodiment of the present application, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal reports at least one of the following to the network side device: the first measurement result and the identifiers of at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell; thereby, the network side device can determine at least one of the following based on the information reported by the terminal: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0288] FIG16 shows a schematic block diagram of a wireless communication device 500 according to an embodiment of the present application. As shown in FIG16 , the wireless communication device 500 includes:

[0289] The transceiver unit 510 is configured to receive first information from a terminal;

[0290] The first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, a signal quality corresponding to each first downlink signal of the first candidate cell, a processed result of the signal qualities corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the wireless communication device 500 desired by the terminal, an identifier or index of a target transceiver beam corresponding to a backhaul link of the wireless communication device 500 desired by the terminal, an identifier or index of a first downlink signal sent by a target cell corresponding to a backhaul link of the wireless communication device 500 desired by the terminal, and whether the terminal desires cooperative transmission of the wireless communication device 500;

[0291] The first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, and the processed signal quality corresponding to all first downlink signals of each candidate cell;

[0292] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0293] In some embodiments, when the first information includes at least one of the first measurement result and identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and a processed result of the signal quality corresponding to all first downlink signals of the first candidate cell, the wireless communication apparatus 500 further includes:

[0294] The processing unit 520 is configured to determine at least one of the following based on the first information:

[0295] The identifier of the target cell corresponding to the return link of the wireless communication device 500 expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the wireless communication device 500 expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the wireless communication device 500 expected by the terminal, and whether the terminal expects the wireless communication device 500 to cooperate in transmission.

[0296] In some embodiments, after receiving the first information, the transceiver unit 510 is further configured to receive second information from the terminal;

[0297] The second information includes at least one of the following: the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, the processed signal quality result corresponding to all second downlink signals of the second candidate cell, the identifier of the target cell corresponding to the backhaul link of the wireless communication device 500 desired by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the backhaul link of the wireless communication device 500 desired by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the wireless communication device 500 desired by the terminal, and whether the terminal expects the wireless communication device 500 to cooperate in transmission;

[0298] The second measurement result includes at least one of the following: the signal quality corresponding to each second downlink signal of each candidate cell, and the processed signal quality corresponding to all second downlink signals of each candidate cell;

[0299] The second candidate cell is a candidate cell of the at least two candidate cells whose signal quality obtained by measuring the second downlink signal is better than a fourth threshold;

[0300] The wireless communication device 500 determines the forwarding beam for each candidate cell based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

[0301] In some embodiments, each of the at least two candidate cells uses the target downlink transmit beam to transmit a second downlink signal multiple times, and a backhaul link of the wireless communication device 500 uses a forwarding beam corresponding to an i-th candidate cell among the at least two candidate cells to forward the second downlink signal sent by the i-th candidate cell;

[0302] The forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the processed signal quality corresponding to all first downlink signals of the i-th candidate cell.

[0303] In some embodiments, when the second information includes at least one of the second measurement result and identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, and a processed result of the signal quality corresponding to all second downlink signals of the second candidate cell, the wireless communication apparatus 500 further includes:

[0304] The processing unit 520 is configured to determine at least one of the following based on the second information:

[0305] The identifier of the target cell corresponding to the return link of the wireless communication device 500 expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the wireless communication device 500 expected by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the return link of the wireless communication device 500 expected by the terminal, and whether the terminal expects the wireless communication device 500 to cooperate in transmission.

[0306] In some embodiments, the transceiver unit 510 may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip.

[0307] It should be understood that the wireless communication device 500 according to the embodiment of the present application may correspond to the relay device in the method embodiment of the present application, and the various units in the wireless communication device 500 are respectively for implementing the corresponding processes of the relay device in the method 200 shown in Figure 7. For the sake of brevity, they will not be repeated here.

[0308] Therefore, in an embodiment of the present application, the terminal obtains a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal determines and reports at least one of the following to the relay device based on the first measurement result: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects collaborative transmission of the relay device.

[0309] Or, in an embodiment of the present application, the terminal can obtain a first measurement result by measuring the first downlink signals of at least two candidate cells forwarded by the relay device; and the terminal reports at least one of the following to the relay device: the first measurement result and the identifiers of at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell; thereby, the relay device can determine at least one of the following based on the information reported by the terminal: the identifier of the target cell corresponding to the return link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the return link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the return link of the relay device expected by the terminal, and whether the terminal expects the relay device to cooperate in transmission.

[0310] The wireless communication 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 a network-side device, or can be a device other than a terminal or a network-side device. For example, the terminal can include but is not limited to the types of terminals 11 listed above, the network-side device can include but is not limited to the types of network-side devices 12 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0311] The wireless communication device provided in the embodiment of the present application can implement each process implemented in the method embodiment of Figure 7 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0312] As shown in FIG. 17 , an embodiment of the present application further provides a communication device 600 , including a processor 601 and a memory 602 , where the memory 602 stores programs or instructions that can be run on the processor 601 .

[0313] For example, when the communication device 600 is a terminal, the program or instruction is executed by the processor 601 to implement the various steps performed by the terminal in the above-mentioned wireless communication method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0314] For another example, when the communication device 600 is a network side device, the program or instruction is executed by the processor 601 to implement the various steps performed by the network side device in the above-mentioned wireless communication method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0315] For another example, when the communication device 600 is a relay device, the program or instruction is executed by the processor 601 to implement the various steps performed by the relay device in the above-mentioned wireless communication method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0316] The present application also provides a terminal, 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 performed by the terminal in the method embodiment shown in FIG7 . This terminal embodiment corresponds to the aforementioned terminal-side method embodiment, and each implementation process and implementation method of the aforementioned method embodiment can be applied to this terminal embodiment and achieve the same technical effects. Specifically, FIG18 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0317] The terminal 700 includes but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709 and at least some of the components of the processor 710.

[0318] Those skilled in the art will appreciate that the terminal 700 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 710 through a power management system, thereby implementing functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in Figure 18 does not constitute a limitation of the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be described in detail here.

[0319] It should be understood that in an embodiment of the present application, the input unit 704 may include a graphics processing unit (GPU) 7041 and a microphone 7042, and the graphics processor 7041 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 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 707 includes a touch panel 7071 and at least one of other input devices 7072. The touch panel 7071 is also called a touch screen. The touch panel 7071 may include two parts: a touch detection device and a touch controller. Other input devices 7072 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.

[0320] In the embodiment of the present application, after receiving downlink data from a network-side device, the RF unit 701 may transmit the data to the processor 710 for processing. Furthermore, the RF unit 701 may send uplink data to the network-side device. Typically, the RF unit 701 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0321] The memory 709 can be used to store software programs or instructions and various data. The memory 709 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 709 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. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct memory bus random access memory (DRRAM). The memory 709 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0322] Processor 710 may include at least one processing unit. Optionally, processor 710 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 710.

[0323] The processor 710 is configured to obtain a first measurement result by measuring first downlink signals of at least two candidate cells forwarded by the relay device; wherein the first measurement result includes at least one of the following: a signal quality corresponding to each first downlink signal of each candidate cell, and a processed result of the signal quality corresponding to all first downlink signals of each candidate cell;

[0324] The radio frequency unit 701 is configured to send first information to the relay device or the network side device according to the first measurement result;

[0325] The first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the processed signal quality result corresponding to all first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, and whether the terminal expects cooperative transmission of the relay device;

[0326] The first candidate cell is a candidate cell among the at least two candidate cells, the signal quality of which obtained by measuring the first downlink signal is better than a first threshold.

[0327] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be described here.

[0328] 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 performed by the network-side device in the method embodiment shown in FIG7 . 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. For the sake of brevity, they are not further described here.

[0329] Specifically, embodiments of the present application also provide a network-side device. As shown in Figure 19, the network-side device 800 includes an antenna 81, a radio frequency device 82, a baseband device 83, a processor 84, and a memory 85. Antenna 81 is connected to radio frequency device 82. In the uplink direction, radio frequency device 82 receives information via antenna 81 and sends the received information to baseband device 83 for processing. In the downlink direction, baseband device 83 processes the information to be transmitted and sends it to radio frequency device 82. Radio frequency device 82 processes the received information and then sends it through antenna 81.

[0330] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 83 , which includes a baseband processor.

[0331] The baseband device 83 may include, for example, at least one baseband board, on which at least two chips are arranged, as shown in Figure 19, one of the chips is, for example, a baseband processor, which is connected to the memory 85 through a bus interface to call the program in the memory 85 to execute the network device operations shown in the above method embodiment.

[0332] The network side device may further include a network interface 86, which is, for example, a Common Public Radio Interface (CPRI).

[0333] Specifically, the network side device 800 of the embodiment of the present application also includes: instructions or programs stored in the memory 85 and can be run on the processor 84. The processor 84 calls the instructions or programs in the memory 85 to execute the method executed by each unit shown in Figure 15 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0334] An embodiment of the present application also 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 wireless communication method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0335] 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.

[0336] 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 wireless communication method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0337] 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.

[0338] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned wireless communication method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0339] An embodiment of the present application also provides a communication system, including: a terminal, a relay device and a network side device, wherein the terminal can be used to execute the steps performed by the terminal in the wireless communication method as described above, the network side device can be used to execute the steps performed by the network side device in the wireless communication method as described above, and the relay device can be used to execute the steps performed by the relay device in the wireless communication method as described above.

[0340] 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.

[0341] 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.

[0342] 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 wireless communication method, comprising: The terminal obtains a first measurement result by measuring first downlink signals of at least two candidate cells relayed by a relay device; wherein, the first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, the result obtained after processing the signal quality corresponding to all first downlink signals of each candidate cell; The terminal sends first information to the relay device or the network-side device according to the first measurement result; Wherein, the first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of a first candidate cell, the result obtained after processing the signal quality corresponding to all first downlink signals of the first candidate cell, the identifier of a target cell corresponding to the backhaul link of the relay device desired by the terminal, the identifier or index of a target transceiver beam corresponding to the backhaul link of the relay device desired by the terminal, the identifier or index of a first downlink signal sent by a target cell corresponding to the backhaul link of the relay device desired by the terminal, whether the terminal desires the relay device to perform cooperative transmission; Wherein, the first candidate cell is a candidate cell among the at least two candidate cells for which the signal quality obtained by measuring the first downlink signal is better than a first threshold.

2. The method according to claim 1, wherein, The terminal sending first information to the relay device or the network-side device according to the first measurement result includes: When the terminal determines that the relay device participates in cooperative transmission, the terminal sends the first information to the relay device or the network-side device; or, When the terminal determines that the relay device does not participate in cooperative transmission, the terminal sends the first information to the relay device or the network-side device, and the first information at least includes whether the terminal desires the relay device to perform cooperative transmission.

3. The method according to claim 1 or 2, wherein, Whether the terminal desires the relay device to perform cooperative transmission includes: When the signal quality of the cascaded channels corresponding to some or all of the candidate cells among the at least two candidate cells is lower than the signal quality of the direct link channel, the terminal does not desire the relay device to perform cooperative transmission; or, When the signal quality of the cascaded channels corresponding to some or all of the candidate cells among the at least two candidate cells is better than or equal to the signal quality of the direct link channel, the terminal desires the relay device to perform cooperative transmission; or, When the signal quality of the direct link channels corresponding to some or all of the candidate cells among the at least two candidate cells is better than a second threshold, the terminal does not desire the relay device to perform cooperative transmission; or, When the signal quality of the direct link channels corresponding to some or all of the candidate cells among the at least two candidate cells is lower than a second threshold, the terminal desires the relay device to perform cooperative transmission; or, When the signal quality of the cascaded channel corresponding to some or all of the candidate cells among the at least two candidate cells is better than a third threshold, the terminal expects the relay device to cooperate in transmission; or, When the signal quality of the cascaded channel corresponding to some or all of the candidate cells among the at least two candidate cells is lower than a third threshold, the terminal does not expect the relay device to cooperate in transmission; Wherein, among the at least two candidate cells, the signal quality of the cascaded channel corresponding to the i-th candidate cell represents the signal quality of the i-th candidate cell - the relay device - the terminal, and the signal quality of the direct connection channel corresponding to the i-th candidate cell represents the signal quality of the i-th candidate cell - the terminal.

4. The method according to claim 3, wherein, The measurement time window associated with the signal quality of the cascaded channel corresponding to the i-th candidate cell is different from the measurement time window associated with the signal quality of the direct connection channel corresponding to the i-th candidate cell; Or, The phase information associated with the signal quality of the cascaded channel corresponding to the i-th candidate cell is different from the phase information associated with the signal quality of the direct connection channel corresponding to the i-th candidate cell.

5. The method according to any one of claims 1 to 4, wherein, Each of the candidate cells among the at least two candidate cells transmits a first downlink signal multiple times using its respective target downlink transmission beam, and the backhaul link of the relay device forwards the first downlink signals transmitted multiple times by each candidate cell using different receiving beams and the same transmission beam, wherein the target downlink transmission beam of each candidate cell is a transmission beam directed to the relay device.

6. The method according to claim 5, wherein, Among the at least two candidate cells, the downlink timing adjustment amount of the i-th candidate cell is the difference between the downlink timing of the i-th candidate cell measured by the control link of the relay device and the downlink timing of the serving cell.

7. The method according to claim 5 or 6, wherein The downlink signals of each of the candidate cells among the at least two candidate cells satisfy at least one of the following: Having the same transmission power, having the same power density, having the same bandwidth.

8. The method according to any one of claims 1 to 4, wherein, Each of the candidate cells among the at least two candidate cells periodically transmits a set of first downlink signals by means of beam scanning, and the backhaul link of the relay device forwards the set of first downlink signals periodically transmitted by each candidate cell using different receiving beams and the same transmission beam.

9. The method according to claim 8, wherein, The periods of transmitting the first downlink signals by each of the candidate cells among the at least two candidate cells are the same; The time window period associated with the backhaul link of the relay device is the same as the period of transmitting the first downlink signals by each candidate cell, or the time window period associated with the backhaul link of the relay device is an integer multiple of the period of transmitting the first downlink signals by each candidate cell.

10. The method according to any one of claims 1 to 9, wherein, After transmitting the first information, the method further includes: The terminal obtains a second measurement result by measuring second downlink signals of the at least two candidate cells forwarded by the relay device, and the second measurement result includes at least one of the following: the signal quality corresponding to each second downlink signal of each candidate cell, and the result obtained after processing the signal quality corresponding to all second downlink signals of each candidate cell; The terminal sends second information to the relay device or the network-side device according to the second measurement result; Wherein, the second information includes at least one of the following: the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, the result obtained after processing the signal quality corresponding to all second downlink signals of the second candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to perform cooperative transmission; Wherein, the second candidate cell is a candidate cell among the at least two candidate cells whose signal quality obtained by measuring the second downlink signal is better than a fourth threshold; Wherein, the forwarding beam of the relay device for each candidate cell is determined based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

11. According to the method of claim 10, wherein, Each candidate cell among the at least two candidate cells sends a second downlink signal multiple times using a target downlink transmission beam, and the relay device's backhaul link forwards the second downlink signal sent by the i-th candidate cell among the at least two candidate cells using the forwarding beam corresponding to the i-th candidate cell; Wherein, the forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the result obtained after processing the signal quality corresponding to all first downlink signals of the i-th candidate cell.

12. A wireless communication method, comprising: The network-side device receives first information from the terminal; Wherein, the first information includes at least one of the following: a first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the result obtained after processing the signal quality corresponding to all first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to perform cooperative transmission; Wherein, the first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, the result obtained by processing the signal quality corresponding to all the first downlink signals of each candidate cell; Wherein, the first candidate cell is a candidate cell among the at least two candidate cells whose signal quality obtained by measuring the first downlink signal is better than a first threshold.

13. The method according to claim 12, wherein, When the first information includes at least one of the first measurement result, the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the result obtained by processing the signal quality corresponding to all the first downlink signals of the first candidate cell, the method further includes: The network-side device determines at least one of the following according to the first information: The identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to perform cooperative transmission.

14. The method according to claim 12, wherein, After receiving the first information, the method further includes: The network-side device receives second information from the terminal; Wherein, the second information includes at least one of the following: the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, the result obtained by processing the signal quality corresponding to all the second downlink signals of the second candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to perform cooperative transmission; Wherein, the second measurement result includes at least one of the following: the signal quality corresponding to each second downlink signal of each candidate cell, the result obtained by processing the signal quality corresponding to all the second downlink signals of each candidate cell; Wherein, the second candidate cell is a candidate cell among the at least two candidate cells whose signal quality obtained by measuring the second downlink signal is better than a fourth threshold; Wherein, the forwarding beam of the relay device for each candidate cell is determined based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

15. The method according to claim 14, wherein, Each candidate cell among the at least two candidate cells sends a second downlink signal multiple times using a target downlink transmission beam, and the backhaul link of the relay device forwards the second downlink signal sent by the i-th candidate cell among the at least two candidate cells using the forwarding beam corresponding to the i-th candidate cell; Among them, the forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the result obtained by processing the signal quality corresponding to all the first downlink signals of the i-th candidate cell.

16. The method according to claim 14 or 15, wherein when the second information includes at least one of the second measurement result, the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, and the result obtained by processing the signal quality corresponding to all the second downlink signals of the second candidate cell, the method further includes: The network-side device determines at least one of the following according to the second information: the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the second downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to cooperate in transmission.

17. The method according to any one of claims 12 to 16, wherein The method further includes: The network-side device schedules the control link of the relay device to access the target cell corresponding to the backhaul link of the relay device.

18. A wireless communication method, including: The relay device receives first information from the terminal; Among them, the first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the result obtained by processing the signal quality corresponding to all the first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the first downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to cooperate in transmission; Among them, the first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, the result obtained by processing the signal quality corresponding to all the first downlink signals of each candidate cell; Among them, the first candidate cell is a candidate cell in which the signal quality obtained by measuring the first downlink signal among the at least two candidate cells is better than a first threshold.

19. The method according to claim 18, wherein when the first information includes at least one of the first measurement result, the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the result obtained by processing the signal quality corresponding to all the first downlink signals of the first candidate cell, the method further includes: The relay device determines at least one of the following according to the first information: The identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the first downlink signal transmitted by the target cell corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to cooperate in transmission.

20. The method according to claim 18, wherein After receiving the first information, the method further includes: The relay device receives second information from the terminal; Wherein, the second information includes at least one of the following: the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, the result obtained by processing the signal quality corresponding to all the second downlink signals of the second candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the second downlink signal transmitted by the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to cooperate in transmission; Wherein, the second measurement result includes at least one of the following: the signal quality corresponding to each second downlink signal of each candidate cell, the result obtained by processing the signal quality corresponding to all the second downlink signals of each candidate cell; Wherein, the second candidate cell is a candidate cell among the at least two candidate cells for which the signal quality measured for the second downlink signal is better than the fourth threshold; Wherein, the forwarding beam of the relay device for each candidate cell is determined based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

21. The method according to claim 20, wherein Each of the at least two candidate cells transmits the second downlink signal multiple times using the target downlink transmission beam, and the relay device's backhaul link forwards the second downlink signal transmitted by the i-th candidate cell among the at least two candidate cells using the forwarding beam corresponding to the i-th candidate cell; Wherein, the forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or, the forwarding beam corresponding to the i-th candidate cell is determined based on the result obtained by processing the signal quality corresponding to all the first downlink signals of the i-th candidate cell.

22. The method according to claim 20 or 21, wherein When the second information includes at least one of the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, and the result obtained by processing the signal quality corresponding to all the second downlink signals of the second candidate cell, the method further includes: The relay device determines at least one of the following according to the second information: The identifier of the target cell corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the terminal, the identifier or index of the second downlink signal transmitted by the target cell corresponding to the backhaul link of the relay device expected by the terminal, whether the terminal expects the relay device to perform cooperative transmission.

23. A wireless communication device, comprising: A processing unit, configured to obtain a first measurement result by measuring first downlink signals of at least two candidate cells relayed by a relay device; wherein, the first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, the result obtained by processing the signal quality corresponding to all first downlink signals of each candidate cell; A transceiver unit, configured to send first information to the relay device or a network-side device according to the first measurement result; Wherein, the first information includes at least one of the following: the first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of a first candidate cell, the result obtained by processing the signal quality corresponding to all first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the wireless communication device, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the wireless communication device, the identifier or index of the first downlink signal transmitted by the target cell corresponding to the backhaul link of the relay device expected by the wireless communication device, whether the wireless communication device expects the relay device to perform cooperative transmission; Wherein, the first candidate cell is a candidate cell among the at least two candidate cells whose signal quality obtained by measuring the first downlink signal is better than a first threshold.

24. The device according to claim 23, wherein, The transceiver unit is specifically configured to: When the wireless communication device determines that the relay device participates in cooperative transmission, send the first information to the relay device or the network-side device; or, When the wireless communication device determines that the relay device does not participate in cooperative transmission, send the first information to the relay device or the network-side device, and the first information at least includes whether the wireless communication device expects the relay device to perform cooperative transmission.

25. The device according to claim 23 or 24, wherein, Each candidate cell among the at least two candidate cells sends first downlink signals multiple times using its respective target downlink transmission beam, and the backhaul link of the relay device forwards the first downlink signals sent by each candidate cell multiple times using different receiving beams and the same transmission beam, wherein the target downlink transmission beam of each candidate cell is a transmission beam pointing to the relay device.

26. The device according to claim 23 or 24, wherein, Each of the at least two candidate cells periodically sends a set of first downlink signals by beam scanning, and the backhaul link of the relay device forwards the set of first downlink signals periodically sent by each candidate cell using different receiving beams and the same transmitting beam.

27. The apparatus according to any one of claims 23 to 26, wherein After sending the first information, the processing unit is further configured to obtain a second measurement result by measuring the second downlink signals of the at least two candidate cells forwarded by the relay device, and the second measurement result includes at least one of the following: the signal quality corresponding to each second downlink signal of each candidate cell, the result obtained by processing the signal qualities corresponding to all the second downlink signals of each candidate cell; The transceiver unit is further configured to send second information to the relay device or the network-side device according to the second measurement result; Wherein, the second information includes at least one of the following: the second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, the result obtained by processing the signal qualities corresponding to all the second downlink signals of the second candidate cell, the identifier of the target cell corresponding to the backhaul link of the relay device expected by the wireless communication device, the identifier or index of the second downlink signal sent by the target cell corresponding to the backhaul link of the relay device expected by the wireless communication device, the identifier or index of the target transceiver beam corresponding to the backhaul link of the relay device expected by the wireless communication device, whether the wireless communication device expects the relay device to cooperate in transmission; Wherein, the second candidate cell is a candidate cell among the at least two candidate cells whose measured signal quality of the second downlink signal is better than a fourth threshold; Wherein, the forwarding beam of the relay device for each candidate cell is determined based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

28. The apparatus according to claim 27, wherein Each of the at least two candidate cells sends second downlink signals multiple times using a target downlink transmission beam, and the backhaul link of the relay device forwards the second downlink signals sent by the i-th candidate cell among the at least two candidate cells using the forwarding beam corresponding to the i-th candidate cell; Wherein, the forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the result obtained by processing the signal qualities corresponding to all the first downlink signals of the i-th candidate cell.

29. A wireless communication device, comprising: A transceiver unit, configured to receive first information from a terminal; Wherein, the first information includes at least one of the following: a first measurement result and identifiers of the at least two candidate cells, signal quality corresponding to each first downlink signal of a first candidate cell, a result obtained by processing signal quality corresponding to all first downlink signals of the first candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to the backhaul link of the relay device desired by the terminal, an identifier or index of a first downlink signal transmitted by the target cell corresponding to the backhaul link of the relay device desired by the terminal, whether the terminal desires the relay device to perform cooperative transmission; Wherein, the first measurement result includes at least one of the following: signal quality corresponding to each first downlink signal of each candidate cell, a result obtained by processing signal quality corresponding to all first downlink signals of each candidate cell; Wherein, the first candidate cell is a candidate cell among the at least two candidate cells for which the signal quality obtained by measuring a first downlink signal is better than a first threshold.

30. The apparatus according to claim 29, wherein, When the first information includes at least one of the first measurement result, identifiers of the at least two candidate cells, signal quality corresponding to each first downlink signal of the first candidate cell, and a result obtained by processing signal quality corresponding to all first downlink signals of the first candidate cell, the wireless communication apparatus further includes: a processing unit, configured to determine at least one of the following according to the first information: an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to the backhaul link of the relay device desired by the terminal, an identifier or index of a first downlink signal transmitted by the target cell corresponding to the backhaul link of the relay device desired by the terminal, whether the terminal desires the relay device to perform cooperative transmission.

31. The apparatus according to claim 29, wherein, After receiving the first information, the transceiver unit is further configured to receive second information from the terminal; Wherein, the second information includes at least one of the following: a second measurement result and identifiers of the at least two candidate cells, signal quality corresponding to each second downlink signal of a second candidate cell, a result obtained by processing signal quality corresponding to all second downlink signals of the second candidate cell, an identifier of a target cell corresponding to a backhaul link of the relay device desired by the terminal, an identifier or index of a second downlink signal transmitted by the target cell corresponding to the backhaul link of the relay device desired by the terminal, an identifier or index of a target transceiver beam corresponding to the backhaul link of the relay device desired by the terminal, whether the terminal desires the relay device to perform cooperative transmission; Wherein, the second measurement result includes at least one of the following: signal quality corresponding to each second downlink signal of each candidate cell, a result obtained by processing signal quality corresponding to all second downlink signals of each candidate cell; Wherein, the second candidate cell is a candidate cell among the at least two candidate cells whose signal quality obtained by measuring the second downlink signal is better than a fourth threshold; Wherein, the relay device's forwarding beam for each candidate cell is determined based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

32. The apparatus according to claim 31, wherein, Each candidate cell among the at least two candidate cells transmits the second downlink signal multiple times using a target downlink transmission beam, and the relay device's backhaul link forwards the second downlink signal transmitted by the i-th candidate cell among the at least two candidate cells using the forwarding beam corresponding to the i-th candidate cell; Wherein, the forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the result obtained by processing the signal quality corresponding to all the first downlink signals of the i-th candidate cell.

33. The apparatus according to claim 31 or 32, wherein, When the second information includes at least one of the second measurement result, the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, and the result obtained by processing the signal quality corresponding to all the second downlink signals of the second candidate cell, the wireless communication apparatus further includes: A processing unit, configured to determine at least one of the following according to the second information: The identifier of the target cell corresponding to the relay device's backhaul link desired by the terminal, the identifier or index of the target transceiver beam corresponding to the relay device's backhaul link desired by the terminal, the identifier or index of the second downlink signal transmitted by the target cell corresponding to the relay device's backhaul link desired by the terminal, whether the terminal desires the relay device to perform cooperative transmission.

34. A wireless communication apparatus, comprising: A transceiver unit, configured to receive first information from a terminal; Wherein, the first information includes at least one of the following: a first measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, the result obtained by processing the signal quality corresponding to all the first downlink signals of the first candidate cell, the identifier of the target cell corresponding to the relay device's backhaul link desired by the terminal, the identifier or index of the target transceiver beam corresponding to the relay device's backhaul link desired by the terminal, the identifier or index of the first downlink signal transmitted by the target cell corresponding to the relay device's backhaul link desired by the terminal, whether the terminal desires the wireless communication apparatus to perform cooperative transmission; Wherein, the first measurement result includes at least one of the following: the signal quality corresponding to each first downlink signal of each candidate cell, the result obtained by processing the signal quality corresponding to all the first downlink signals of each candidate cell; Wherein, the first candidate cell is a candidate cell among the at least two candidate cells whose signal quality obtained by measuring the first downlink signal is better than a first threshold.

35. The apparatus according to claim 34, wherein, when the first information includes at least one of the first measurement result, the identifiers of the at least two candidate cells, the signal quality corresponding to each first downlink signal of the first candidate cell, and the processed result of the signal quality corresponding to all first downlink signals of the first candidate cell, the wireless communication apparatus further comprises: a processing unit, configured to determine at least one of the following according to the first information: the identifier of the target cell corresponding to the backhaul link of the wireless communication apparatus expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the wireless communication apparatus expected by the terminal, the identifier or index of the first downlink signal transmitted by the target cell corresponding to the backhaul link of the wireless communication apparatus expected by the terminal, whether the terminal expects the wireless communication apparatus to perform cooperative transmission.

36. The apparatus according to claim 34, wherein, after receiving the first information, the transceiver unit is further configured to receive second information from the terminal; wherein the second information includes at least one of the following: a second measurement result and the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, the processed result of the signal quality corresponding to all second downlink signals of the second candidate cell, the identifier of the target cell corresponding to the backhaul link of the wireless communication apparatus expected by the terminal, the identifier or index of the second downlink signal transmitted by the target cell corresponding to the backhaul link of the wireless communication apparatus expected by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the wireless communication apparatus expected by the terminal, whether the terminal expects the wireless communication apparatus to perform cooperative transmission; wherein the second measurement result includes at least one of the following: the signal quality corresponding to each second downlink signal of each candidate cell, the processed result of the signal quality corresponding to all second downlink signals of each candidate cell; wherein the second candidate cell is a candidate cell among the at least two candidate cells for which the signal quality obtained by measuring the second downlink signal is better than a fourth threshold; wherein the forwarding beam of the wireless communication apparatus for each candidate cell is determined based on the first measurement result in the first information and the identifiers of the at least two candidate cells.

37. The apparatus according to claim 36, wherein, each of the at least two candidate cells transmits a second downlink signal multiple times using a target downlink transmission beam, and the backhaul link of the wireless communication apparatus forwards the second downlink signal transmitted by the i-th candidate cell among the at least two candidate cells using the forwarding beam corresponding to the i-th candidate cell; wherein the forwarding beam corresponding to the i-th candidate cell is determined based on the signal quality corresponding to each first downlink signal of the i-th candidate cell, or the forwarding beam corresponding to the i-th candidate cell is determined based on the processed result of the signal quality corresponding to all first downlink signals of the i-th candidate cell.

38. The apparatus according to claim 36 or 37, wherein, When the second information includes at least one of the second measurement result, the identifiers of the at least two candidate cells, the signal quality corresponding to each second downlink signal of the second candidate cell, and the processed result of the signal quality corresponding to all the second downlink signals of the second candidate cell, the wireless communication device further includes: a processing unit, configured to determine at least one of the following according to the second information: the identifier of the target cell corresponding to the backhaul link of the wireless communication device desired by the terminal, the identifier or index of the target transceiver beam corresponding to the backhaul link of the wireless communication device desired by the terminal, the identifier or index of the second downlink signal transmitted by the target cell corresponding to the backhaul link of the wireless communication device desired by the terminal, whether the terminal desires the wireless communication device to perform cooperative transmission.

39. A terminal, comprising a transceiver, a processor, and a memory, where the memory stores a program or instruction that can run on the processor, and when the program or instruction is executed by the processor, the steps of the wireless communication method according to any one of claims 1 to 11 are implemented.

40. A network-side device, comprising a transceiver, a processor, and a memory, where the memory stores a program or instruction that can run on the processor, and when the program or instruction is executed by the processor, the steps of the wireless communication method according to any one of claims 12 to 17 are implemented.

41. A relay device, comprising a transceiver, a processor, and a memory, where the memory stores a program or instruction that can run on the processor, and when the program or instruction is executed by the processor, the steps of the wireless communication method according to any one of claims 18 to 22 are implemented.

42. A readable storage medium, wherein, A program or instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the steps of the wireless communication method according to any one of claims 1 to 11 are implemented, or the steps of the wireless communication method according to any one of claims 12 to 17 are implemented, or the steps of the wireless communication method according to any one of claims 18 to 22 are implemented.

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