Method, apparatus, relay device, and network-side device for determining transmission configuration of backhaul link

Abstract

This application discloses a method, apparatus, relay device, and network-side device for determining a transmission configuration of a backhaul link, belonging to the communication field. The method for determining the transmission configuration of the backhaul link according to the embodiments of this application includes that the relay device obtains a set of candidate beams that can be configured for the control link, and the relay device determines a transmission configuration indication (TCI) configuration of the downlink signal and / or a transmission configuration of the uplink signal of the backhaul link based on the set of candidate beams.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of a Chinese patent application with the application number 202210879050.6 and the title "Method, Apparatus, Relay Device, and Network - side Device for Determining Transmission Configuration of Backhaul Link", which was filed with the Chinese Patent Office on July 25, 2022, and all of its contents are incorporated herein by reference.

[0002] This application belongs to the field of communication technologies, and specifically relates to a method, apparatus, relay device, and network - side device for determining the transmission configuration of a backhaul link.

Background Art

[0003] Signal amplifiers are widely used to expand the coverage of cells. For example, a Network Controlled Repeater (NCR), as a relay node, can transfer signals from a base station or a User Equipment (UE, also called a terminal device) and amplify the signals to achieve the purpose of expanding the coverage.

[0004] Here, the NCR has the ability of beamforming and can receive control from an upstream base station (i.e., a donor base station), that is, the base station can control the transmission parameters of the NCR. For example, the base station can control the reception / transmission beams between the NCR and the base station or between the NCR and the UE.

[0005] For example, in the network structure shown in Figure 2, it includes three network nodes. The middle network node is a type of NCR device, which includes a mobile termination (MT) and a forwarding unit (Fwd). Here, the MT can establish a connection with the upstream base station (i.e., the control link). The base station transmits control signaling to the NCR via the MT and can control the transmission / reception related parameters (including parameters such as power, amplification factor, beam, on / off, etc.) of the backhaul link (BH) between the NCR and the base station or the access link (AL) between the NCR and the UE.

[0006] The link between the NCR and the base station needs to determine the downlink signal reception beam and the uplink signal transmission beam of the NCR. For the control link downlink signals (including PDCCH, PDSCH, SSB, etc.) transmitted by the base station to the NCR, the NCR can determine the reception beam of the corresponding control link downlink signal according to the rule for the terminal to receive the downlink signal. However, for the backhaul link downlink signal transmitted by the base station to the NCR and amplified and transferred by the NCR, there is still no corresponding determination method for the corresponding reception beam. Similarly, for the backhaul link uplink signal transmitted by the terminal to the NCR and amplified and transferred by the NCR to the base station, there is also no corresponding determination method for the transmission beam of the NCR's uplink signal.

[0007] As can be seen from the above, the current solution does not provide a method for determining the reception beam of the downlink signal and the transmission beam of the uplink signal in the backhaul link of the NCR.

Summary of the Invention

Problems to be Solved by the Invention

[0008] Embodiments of the present application provide a method and apparatus for determining a transmission configuration of a backhaul link, a relay device, and a network-side device, and provide a method for determining a reception beam of a downlink signal and / or a transmission beam of an uplink signal in an NCR backhaul link. **Means for Solving the Problem**

[0009] According to a first aspect, a method for determining a transmission configuration of a backhaul link is provided, and this determination method includes: The relay device obtains a set of candidate beams that can be configured for the control link; The relay device determines a transmission configuration indication (TCI) configuration of a downlink signal and / or a transmission configuration of an uplink signal of the backhaul link based on the set of candidate beams.

[0010] According to a second aspect, a method for determining a transmission configuration of a backhaul link is provided, and this determination method includes: The network-side device determines a set of candidate beams that can be configured for the control link; The network-side device transmits beam configuration signaling of the backhaul link to the relay device, where the beam configuration signaling is used to instruct the relay device to determine a transmission configuration indication (TCI) configuration of a downlink signal and / or a transmission configuration of an uplink signal of the backhaul link based on the set of candidate beams that can be configured for the control link; The network-side device determines a transmission beam of the downlink signal and / or a reception beam of the uplink signal of the backhaul link based on the beam configuration signaling or protocol regulations.

[0011] According to a third aspect, a device for determining a transmission configuration of a backhaul link is provided, and this determination device includes: A candidate beam set acquisition module for acquiring a set of candidate beams that can be configured for the control link; A first configuration determination module for determining a transmission configuration indication TCI configuration of a downlink signal and / or a transmission configuration of an uplink signal of a backhaul link based on the candidate beam set is included.

[0012] According to a fourth aspect, a transmission configuration determination apparatus for a backhaul link is provided. The determination apparatus includes: a candidate beam set determination module for determining a configurable candidate beam set of a control link; a first transmission module used to transmit beam configuration signaling of a backhaul link to a relay device, where the beam configuration signaling is for instructing the relay device to determine a transmission configuration indication TCI configuration of a downlink signal and / or a transmission configuration of an uplink signal of the backhaul link based on the configurable candidate beam set of the control link; a second configuration determination module for determining a transmission beam of a downlink signal and / or a reception beam of an uplink signal of the backhaul link based on the candidate beam set according to the beam configuration signaling or protocol specification.

[0013] According to a fifth aspect, a relay device including a processor and a memory is provided. The memory stores a program or instruction executable on the processor, and when the program or instruction is executed by the processor, the steps of the method according to the first aspect are realized.

[0014] According to a sixth aspect, a network-side device including a processor and a memory is provided. The memory stores a program or instruction executable on the processor, and when the program or instruction is executed by the processor, the steps of the method according to the second aspect are realized.

[0015] According to a seventh aspect, a transmission configuration determination system for a backhaul link is provided, including a relay device and a network-side device. The relay device may be used to execute the steps of the transmission configuration determination method for the backhaul link described in the first aspect above, and the network-side device may be used to execute the steps of the transmission configuration determination method for the backhaul link described in the second aspect above.

[0016] According to an eighth aspect, a readable storage medium is provided, in 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 realized, or the steps of the method described in the second aspect are realized.

[0017] According to a ninth aspect, a chip is provided, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor runs a program or instruction and is used to realize the method described in the first aspect or the method described in the second aspect.

[0018] According to a tenth aspect, a computer program / program product is provided. The computer program / program product is stored in a storage medium and is executed by at least one processor to realize the steps of the method described in the first aspect or the second aspect.

[0019] According to an eleventh aspect, an embodiment of the present application provides a transmission configuration determination device for a backhaul link, and the device is used to execute the steps of the transmission configuration determination method for the backhaul link described in the first aspect or the second aspect.

Advantages of the Invention

[0020] In the embodiments of the present application, the relay device can obtain a candidate beam set that can configure the control link, and thereby determine the TCI configuration of the downlink signal and / or the transmission configuration of the uplink signal of the backhaul link based on this candidate beam set. That is, in the embodiments of the present application, the reception beam of the downlink signal and / or the transmission beam of the uplink signal of the backhaul link can be selected from the candidate beam set of the control link. Therefore, the embodiments of the present application provide a method for determining the reception beam of the downlink signal and / or the transmission beam of the uplink signal in the backhaul link of the NCR.

Brief Description of the Drawings

[0021]

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Embodiment

[0022] The following clearly and completely describes the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all of them. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art shall fall within the protection scope of the present application.

[0023] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such terms are interchangeable when appropriate, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, without limiting the number of objects. For example, the first object may be one or more. In addition, "and / or" in the description and claims represents at least one of the connected objects, and the character " / " generally represents that the related objects before and after are in an "or" relationship.

[0024] It should be noted that the technology described in the embodiments of this application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be applied to other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of this application are always used interchangeably, and the described technology may be used in the systems and radio technologies mentioned above, or in other systems and radio technologies. The following description describes the New Radio (NR) system for illustrative purposes and uses NR terms in most of the following descriptions, but these technologies may also be applied to applications other than NR system applications, such as the sixth generation (6 th Generation, 6G) communication system.

[0025] FIG. 1 shows a block diagram of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network-side device 12. Here, the terminal 11 may be a mobile phone, a tablet personal computer, a laptop computer (or called a notebook computer), a personal digital assistant (PDA), a palm-top computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, a vehicle-mounted device (VUE), a pedestrian terminal (PUE), a smart home (a home device having a wireless communication function, such as a refrigerator, a television, a washing machine or furniture, etc.), a game machine, a personal computer (PC), a deposit / withdrawal machine or a self-service machine, etc. The wearable device may include a smart watch, a smart band, smart earphones, smart glasses, a smart accessory (a smart bracelet, a smart bracelet, a smart ring, a smart necklace, a smart anklet, etc.), a smart list band, a smart clothing, etc. It should be noted that in the embodiments of the present application, the specific type of the terminal 11 is not limited. The network-side device 12 may include an access network device or a core network device. Here, the access network device may be called a wireless access network device, a radio access network (RAN), a wireless access network function or a wireless access network unit.The access network device may include a base station, a WLAN access point, or a WiFi node, etc. The base station may be called a Node B, an evolved Node B (eNB), an access point, a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a home Node B, a home evolved Node B, a Transmitting Receiving Point (TRP), or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. For the sake of description, only the base station in the NR system in the embodiments of the present application is taken as an example, but it does not limit the specific type of the base station.

[0026] Here, in order to facilitate the understanding of the method for determining the transmission configuration of the backhaul link in the embodiments of the present application, the related technologies are described below.

[0027] According to a first aspect, it relates to the beam control of the access link.

[0028] Currently, the base station can control the beam of the NCR control link. For example, it can indicate the beam number of the reception or transmission of the control link or the related Reference Signals (RS) number by beam indication information, and the NCR adjusts the beam of the control link based on the base station instruction.

[0029] According to a second aspect, the method for the uplink / downlink beam indication of the terminal in Rel-15 is as follows: For the downlink beam, the terminal needs to receive broadcast signals, such as Synchronization Signal Block (SSB), Channel State Information-Reference Signal (CSI-RS), cell-specific Physical Downlink Control Channel (cell-specific PDCCH), cell-specific Physical Downlink Shared Channel (cell-specific PDSCH), UE-specific Physical Downlink Control Channel (UE-specific PDCCH), and UE-specific Physical Downlink Shared Channel (UE-specific PDSCH). Each downlink signal and downlink physical channel needs to determine the corresponding downlink beam.

[0030] Here, the method for determining the downlink beam of the terminal includes implicitly determining the downlink beam from the SSB set based on pre-defined rules, and explicitly determining the downlink beam based on Downlink Control Information (DCI) or Media Access Control Control Element (MAC CE) or Radio Resource Control (RRC) signaling.

[0031] Specifically, the network-side device may configure one set of Transmission Configuration Indicator (TCI) candidates through RRC signaling (for example, Physical Downlink Shared Channel Configuration (PDSCH-config)), where the set contains M sets of TCI configuration information. The value of M is determined by the terminal's capabilities. The network-side device selects up to 8 TCI configurations from the M sets of TCI configuration information through MAC CE activation signaling and maps them to the DCI field "Transmission Configuration Indication". The terminal determines the TCI configuration of the corresponding PDSCH by reading the DCI field "Transmission Configuration Indication".

[0032] For PDCCH, the network-side device can configure the corresponding TCI for each type of Control Resource Set (CORESET). If the system has not configured the TCI or the activation signaling (i.e., MAC CE activation command) has not been received, the terminal defaults to using the SSB used in the most recent random access process as the quasi co-location (QCL) reference beam for PDCCH. After the terminal receives the MAC CE activation command, the terminal starts activation in slot

Number

Number

[0033] For PDSCH, the network - side device can configure one TCI candidate set for the terminal and dynamically indicate the TCI configuration information of PDSCH by DCI. If the TCI configuration set is not configured or not yet activated, the terminal uses the reference beam of quasi - co - location according to the SSB used in the random access process. Here, the TCI of PDSCH indicated by DCI needs to be activated after the terminal receives the DCI (after the quasi - co - location time duration (timeDurationForQCL) slots). If the scheduled PDSCH time offset is shorter than the timeDurationForQCL slots, the terminal receives the PDSCH according to the quasi - co - location configuration of the latest COREST. Here, the value of timeDurationForQCL may be predefined. For example, when the subcarrier spacing (SubCarrier Spacing, SCS) is 60 kHz, the selectable values are 7, 14, 28. When SCS is 120 kHz, the selectable values are 14, 28.

[0034] For the uplink beam, the terminal determines it based on the sounding reference signal resource indicator (SRI) for channel sounding or the downlink beam. For example, for the physical uplink control channel (PUCCH), the network device configures the uplink beam of the PUCCH with the physical uplink control channel spatial relation (PUCCH-SpatialRelationInfo) parameter, and can indicate, for example, one SSB or channel state information-reference signal (CSI-RS). The transmission beam (spatial domain filter) of the PUCCH corresponds to the reception beam of the SSB or CSI-RS, or indicates one SRS, and the transmission beams of the PUCCH and SRS are the same. The transmission beam of the physical uplink shared channel (PUSCH) needs to be the same as that of the PUCCH. If there is no reference PUCCH, the beam of the CORESET with the smallest number is used as the reference.

[0035] According to a third aspect, a method for the terminal to indicate uplink / downlink beams in Rel-17: The beam indication mechanism includes TCI configuration, TCI state activation, and TCI indication.

[0036] For the TCI configuration and the activation of the TCI state, the TCI configurations of the uplink and downlink may be configured uniformly or separately. For the TCI state configured uniformly for the uplink and downlink, up to eight of the TCI states can be activated by the MAC CE. For the TCI state configured separately for the uplink and downlink, the gNB can activate up to eight pairs of the TCI states via the MAC CE.

[0037] For Rel-17 terminals, the 5G base station (NR Node B, gNB) transmits beam indication information (i.e., TCI indication information) to uniformly indicate the beams of the uplink signal and the downlink signal. The content indicated by the beam indication information is one or a pair of the TCI states activated by the MAC CE. The start time of the activation of the TCI indication information is x time units after the ACK feedback corresponding to the TCI indication information, and the end time of the activation of the TCI indication information is the start time of the activation of the next TCI indication information.

[0038] As can be seen from the above description, 1. The downlink channel may be configured with different beams. For example, the PDCCH and the PDSCH may be configured with different TCIs, and different CORESETs of the PDCCH may be configured with different beams.

[0039] 2. The beams of the downlink channel may be dynamically configured by signaling. 3. The beams of the uplink channel may be determined based on the beams of the downlink channel or may be individually configured (SRI).

[0040] Hereinafter, in conjunction with the drawings, the method for determining the transmission configuration of the backhaul link according to the embodiments of the present application will be described in detail by several embodiments and their application scenarios.

[0041] According to the first aspect, referring to FIG. 3, an embodiment of the present application provides a method for determining a transmission configuration of a backhaul link, and this method may include the following steps.

[0042] Step 301: The relay device acquires a set of candidate beams that can be configured for the control link.

[0043] Optionally, the set of candidate beams may include a beam corresponding to candidate TCI configuration information of the control link, a beam corresponding to the downlink reference signal of the control link, a beam corresponding to the downlink physical channel of the control link, a beam corresponding to the uplink reference signal of the control link, and at least one of a beam corresponding to the uplink physical channel of the control link.

[0044] Here, the candidate TCI configuration described above is available but not yet activated. The downlink reference signal of the control link described above may include SSB and / or CSI-RS. The downlink physical channel of the control link described above may include PDCCH and / or PDSCH. The uplink reference signal of the control link described above may include SRS and / or PRACH. The uplink physical channel of the control link described above may include PUCCH and / or PUSCH.

[0045] Step 302: The relay device determines a transmission configuration indication TCI configuration for the downlink signal and / or a transmission configuration for the uplink signal of the backhaul link based on the set of candidate beams.

[0046] Here, determining the TCI configuration of the downlink signal of the backhaul link means determining the receive beam of the downlink signal in the backhaul link of the relay device, and determining the transmission configuration of the uplink signal of the backhaul link means determining the transmit beam of the uplink signal in the backhaul link of the relay device.

[0047] Also, the NCR backhaul link has different transmission requirements from the PDSCH. For example, the PDSCH with dynamic scheduling determines the transmission time and beam (i.e., TCI configuration) by the downlink control signaling DCI. The NCR backhaul link is one of the relay links. The backhaul link needs to carry multiple types of downlink channels such as PDSCH, PDCCH, and SSB for the terminal and needs to be on for a long time, and the beam needs to not change for a long time. Similarly, the backhaul link needs to carry multiple types of uplink channels such as PUCCH, PUSCH, and SRS from multiple terminals and occupy multiple uplink slots. Therefore, the uplink of the backhaul link also needs to be on for a long time. Therefore, NCR tends to use the receive beam or transmit beam with the same long duration as the beam configuration of the backhaul link. For the backhaul link that is on for a long time, the conventional dynamic beam indication method (i.e., the dynamic beam indication used for PDSCH or PUSCH) is not suitable for the NCR backhaul link. As can be understood, the TCI configuration of the downlink signal and the transmission configuration of the uplink signal of the backhaul link may be valid for a long time, and the valid time is defined by the protocol or explicitly indicated by the network or remains valid until the TCI configuration of the new downlink signal and the transmission configuration of the uplink signal become valid.

[0048] In the embodiments of the present application, the relay device can obtain a set of candidate beams that can form a control link, and thereby determine the TCI configuration of the downlink signal and / or the transmission configuration of the uplink signal of the backhaul link based on this set of candidate beams. That is, in the embodiments of the present application, the reception beam of the downlink signal and / or the transmission beam of the uplink signal of the backhaul link can be selected from the set of candidate beams of the control link. Therefore, the embodiments of the present application provide a method for determining the reception beam of the downlink signal and / or the transmission beam of the uplink signal in the backhaul link of the NCR.

[0049] Optionally, the TCI configuration of the downlink signal of the backhaul link is at least one of the reference signal of the control link and the quasi-collocation QCL type.

[0050] Here, the reference signal of the control link may be one of SSB and CSI-RS.

[0051] Also, different QCL types correspond to different QCL parameters, or different QCL types indicate different QCL parameters. Therefore, the QCL type included in the TCI configuration of the downlink signal can indicate different QCL parameters. Here, the QCL parameters include spatial receiver parameter, Doppler shift, Doppler spread, average delay, delay spread, and at least one of average gain.

[0052] Optionally, the relay device determines the TCI configuration of the downlink signal of the backhaul link based on the set of candidate beams, which is The relay device determines the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set according to protocol regulations. Or, The relay device receives first configuration signaling transmitted by a network-side device. The relay device includes determining the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set based on the first configuration signaling.

[0053] Here, since relevant information on the TCI configuration of the downlink signal of the backhaul link exists in the above protocol regulations or the first configuration signaling, the relay device can determine the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set of the control link based on the above protocol regulations or the first configuration signaling.

[0054] As can be seen from this, in the embodiments of the present application, the relay device may determine the received beam of the downlink signal of the backhaul link by using the following Method 1 or Method 2.

[0055] Method 1: Determine the received beam of the downlink signal of the backhaul link based on the candidate beam set of the control link according to protocol regulations. Method 2: Determine the received beam of the downlink signal of the backhaul link based on the candidate beam set of the control link based on the received first configuration signaling.

[0056] For better understanding, the above Method 1 and Method 2 may be integrated into one solution here. For example, when the network-side device does not configure the TCI of the downlink signal using dedicated signaling (i.e., the above first configured signaling), or before the TCI configuration configured by the dedicated signaling starts to be activated or after the activation time ends, the relay device may determine the reception beam of the downlink signal (i.e., Method 1) according to the pre-stipulated protocol. After receiving the dedicated signaling (i.e., the above first configured signaling), it determines the reception beam of the downlink signal based on the dedicated signaling.

[0057] Here, the above first configured signaling may be MAC CE, RRC or DCI.

[0058] For example, the network-side device may transmit MAC CE (e.g., TCI activation signaling) or RRC signaling periodically or aperiodically to indicate the TCI configuration of the downlink signal of the backhaul link. Also, for example, it transmits DCI signaling on a dedicated CORESET or transmits DCI signaling in a dedicated format to indicate the TCI configuration of the downlink signal of the backhaul link. Specifically, for example, the DCI field "Transmission Configuration Indication" or the reserved field in DCI may be multiplexed (i.e., the relevant information of the TCI configuration of the downlink signal of the backhaul link may be carried in the DCI field "Transmission Configuration Indication" or the reserved field in DCI), or an a (e.g., a = 1) bit field in DCI may be used to indicate whether "Transmission Configuration Indication" is used for the control link or the backhaul link.

[0059] In addition, the network-side device may configure the time period for turning on the backhaul link for the relay device and at the same time configure the TCI configuration of the downlink signal. That is, the first configuration signaling may be signaling for configuring the time period for turning on the backhaul link. Optionally, when the relay device determines the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set based on the first configuration signaling, the TCI configuration of the downlink signal of the backhaul link is activated from the time indicated by k+X, where k indicates the slot or the last symbol where the first configuration signaling is located, or the slot or the last symbol where the hybrid automatic repeat request-acknowledgment feedback message corresponding to the first configuration signaling is located, and X is determined by the protocol regulations or determined based on the capabilities of the relay device. That is, it is necessary to meet the delay requirement until the TCI configuration of the downlink signal from when the relay device receives the dedicated signaling (i.e., the first configuration signaling) to the backhaul link of the relay device becomes effective.

[0060] Here, X is [Number] [Number] represents the number of slots included in one subframe when the subcarrier bandwidth configuration is μ, and x is a numerical value defined by the protocol.

[0061] Optionally, the first configuration signaling may explicitly indicate the activation time of the TCI configuration of the downlink signal, including the activation start point and / or the length of the activation time.

[0062] As will be understood hereinafter, in the above-described first configuration signaling, the valid time period or valid time cycle of the TCI configuration of the downlink signal may further be carried. The valid time period or valid time cycle may include the on or operating time period of the backhaul link. For example, when the on or operating time period of the backhaul link of the relay device and the corresponding TCI configuration of the downlink signal and the transmission configuration of the uplink signal are indicated by the first configuration signaling, the relay device uses the corresponding TCI configuration and the transmission configuration of the uplink signal in the operating time period configured by the dedicated signaling to perform downlink signal reception and uplink signal transmission of the backhaul link.

[0063] As can be understood, after receiving the TCI configuration of the new downlink signal and before the TCI configuration of the new downlink signal becomes effective, the backhaul link of the relay device can operate according to the protocol regulations. For example, signal transfer is performed using the TCI configuration of the conventional downlink signal, or signal transfer is not performed before the TCI configuration of the new downlink signal becomes effective.

[0064] Optionally, when the relay device determines the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set, it can be divided into cases A-1 to A-4 described below.

[0065] Case A-1: When the protocol regulations or the first configuration signaling indicate that the downlink reference signal and / or the downlink physical channel of the control link have a QCL relationship with the backhaul link, the TCI configuration of the downlink signal of the backhaul link is determined based on the downlink reference signal and / or the downlink physical channel of the control link.

[0066] The situation of Case A-1 will be specifically described below.

[0067] A-1.1. Optionally, when the protocol specification or the first configuration signaling indicates that there is a QCL relationship between the downlink reference signal of the control link and the backhaul link, the reference signal included in the TCI configuration of the downlink signal of the backhaul link is the downlink reference signal of the control link, and the QCL type is determined based on the protocol specification or determined based on the configuration of the network-side device.

[0068] That is, the statement in the above that "the TCI configuration of the downlink signal of the backhaul link is determined based on the downlink reference signal of the control link" may, here, have a specific determination method as follows.

[0069] The reference signal included in the TCI configuration of the downlink signal of the backhaul link is the downlink reference signal of the control link, and the QCL type is determined based on the protocol specification or determined based on the configuration of the network-side device. For example, the reference signal included in the TCI configuration of the downlink signal of the backhaul link selects the SSB selected when the control link performs random access according to the protocol specification. Also for example, the reference signal included in the TCI configuration of the downlink signal of the backhaul link selects the CSI-RS of the control link according to the configuration of the network-side device. Also for example, the reference signal included in the TCI configuration of the downlink signal of the backhaul link is defined as the downlink reference signal that the control link transmitted most recently according to the protocol.

[0070] Optionally, the pseudo-collocation parameter (i.e., the parameter corresponding to the QCL type) may include at least one of the Spatial Rx parameter (i.e., QCL type D), average gain, and the parameters defined in QCL Types A, B, and C. For example, the protocol specification may configure the QCL type to QCL Type D by default, or may configure the pseudo-collocation parameter to QCL Type D and average gain by default. The explicit configuration of the network may be some of the pseudo-collocation parameters here.

[0071] Here, the downlink reference signal may be an SSB or a CSI-RS. For example, the protocol specification stipulates that if an SSB or a CSI-RS (e.g., CSI-RS for tracking) selected by the control link has a QCL relationship with the backhaul link (i.e., using the SSB or CSI-RS selected by the control link as the QCL-related signal of the backhaul link), then the reference signal in the TCI configuration of the downlink signal of the backhaul link is an SSB or a CSI-RS, and the QCL type in the TCI configuration of the downlink signal is specified by the protocol or configured by the network-side device (i.e., the downlink beam of the backhaul link and the SSB or CSI-RS satisfy the QCL type specified by the protocol or configured by the network-side device). Here, this SSB may be the SSB selected in the random access process of the relay device.

[0072] The following describes different cases where the downlink reference signals establishing the QCL relationship with the backhaul link are an SSB and a CSI-RS, respectively.

[0073] (1) If the protocol regulation or the first configuration signaling indicates that there is a QCL relationship in the SSB of the backhaul link and the control link, the backhaul link of the relay device shall select the SSB used in the most recent random access process of the control link as the reference signal for QCL. Specific implementation details are illustrated as follows.

[0074] Optionally, from the perspective of the relay device, in the time-frequency resource of SSB transmission, the reception beam of the downlink signal of the backhaul link and the reception beam of the SSB of the control link satisfy the QCL type defined by the protocol or configured by the network side (i.e., the reception beam of the downlink signal of the backhaul link is the same as the reception beam of the SSB of the control link). From the perspective of the network side device, in the time-frequency resource where the SSB is transmitted, the transmission beam of the downlink signal of the backhaul link coincides with the transmission beam of the SSB of the control link.

[0075] Optionally, if there is a QCL relationship between the SSB of the control link and the downlink signal of the backhaul link, and the second configuration signaling transmitted by the network side device carries the identification information of the SSB (e.g., SSB number), the reference signal included in the TCI configuration of the downlink signal of the backhaul link is the SSB corresponding to the identification information of the SSB carried in the second configuration signaling. Here, the second configuration signaling may be MAC CE or RRC or DCI. Also, this second configuration signaling may be the same as or different from the first configuration signaling.

[0076] Here, the SSB indicated by the identification information of the SSB carried in the second configuration signaling may be different from the SSB in the process where the relay device randomly accesses.

[0077] (2) When the protocol regulation or the first configuration signaling indicates that there is a QCL relationship in the CSI-RS of the backhaul link and the control link, the backhaul link of the relay device selects CSI-RS as the reference signal of QCL, and the specific implementation details are illustrated as follows.

[0078] Optionally, from the perspective of the relay device side, in the time-frequency resource of CSI-RS transmission, the reception beam of the downlink signal of the backhaul link and the CSI-RS reception beam of the control link satisfy the QCL type defined by the protocol or configured by the network side (that is, the reception beam of the downlink signal of the backhaul link is the same as the reception beam of the CSI-RS of the control link). From the perspective of the network side device side, in the time-frequency resource where CSI-RS is transmitted, the transmission beam of the downlink signal of the backhaul link coincides with the CSI-RS transmission beam of the control link.

[0079] A-1.2. Optionally, when the protocol regulation or the first configuration signaling indicates that there is a QCL relationship between the downlink physical channel of the control link and the backhaul link, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the downlink physical channel of the control link.

[0080] That is, the "TCI configuration of the downlink signal of the backhaul link is determined based on the downlink physical channel of the control link" described above means that here, the specific determination method may be that the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the downlink physical channel of the control link. Further, for example, according to the protocol regulation, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the most recent downlink physical channel of the control link.

[0081] Optionally, the above-mentioned partial identity means that the reference signals included in the TCI configuration are the same, and the QCL type is indicated by the protocol specification or by a configuration message.

[0082] That is, it may be indicated by the protocol specification that there is a QCL relationship between the downlink physical channel of the control link and the backhaul link, or it may be indicated by the first configuration signaling that there is a QCL relationship between the downlink physical channel of the control link and the backhaul link. In such a case, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the downlink physical channel of the control link. For example, the reference signals in both are the same, but the QCL types are different. At this time, the QCL type may be indicated independently by the network-side device or specified by the protocol.

[0083] Optionally, when there is a QCL relationship between the downlink physical channel of the control link and the backhaul link, the TCI configuration of the downlink signal is the same as or partially the same as the TCI configuration corresponding to the spatial receiver parameters in the TCI configuration of the downlink physical channel.

[0084] That is, the downlink physical channel with a QCL relationship with the backhaul link includes two TCI configurations. In the embodiments of the present application, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration corresponding to the spatial receiver parameter (i.e., QCL TypeD) in these two TCI configurations.

[0085] Here, the above-mentioned downlink physical channel may be a PDCCH or a PDSCH. In the following, different cases where the downlink physical channels establishing a QCL relationship with the backhaul link are a PDCCH and a PDSCH respectively will be described.

[0086] (1) If the protocol regulation or the first configuration signaling indicates that there is a QCL relationship in the PDCCH of the backhaul link and the control link, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of a specific search space or a specific control resource set (CORESET) of the PDCCH. Here, the determination method of the specific CORESET may be predefined by the protocol (for example, specifying whether the CORESET corresponding to the Type0 PDCCH or the CORESET with the smallest CORESET number is the specific CORESET), or it may be configured by the network side (that is, the identification information of the CORESET (such as the CORESET code) may be carried in the signaling transmitted by the network side device, and the CORESET indicated by this identification information is the specific CORESET). Similarly, the determination method of the specific search space is similar to that of the specific CORESET, and will not be further described here.

[0087] The details of the specific implementation in such a case are exemplified as follows.

[0088] Optionally, from the perspective of the relay device, in the time-frequency resource where a specific search space or a specific CORESET of the PDCCH is located, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the PDCCH in this specific SS or specific CORESET. From the perspective of the network side device, in the time-frequency resource where a specific search space or a specific CORESET of the PDCCH is located, the downlink signal transmission beam of the backhaul link coincides with the beam of the PDCCH in this specific SS or specific CORESET.

[0089] Optionally, when viewed from the relay device side, within v1 time units after a specific search space of PDCCH or a specific CORESET, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the PDCCH in this specific SS or specific CORESET. When viewed from the network side device side, within v1 time units after a specific search space of PDCCH or a specific CORESET, the downlink signal transmission beam of the backhaul link coincides with the beam of the PDCCH in this specific search space or specific CORESET. Here, the value of v1 is defined by the protocol or explicitly configured by the network side or remains valid until a new TCI configuration is configured for this specific search space or specific CORESET, or remains valid until the next control link PDCCH transmission. This time unit is, for example, a slot or a symbol or a millisecond (ms).

[0090] (2) When the protocol regulation or the first configuration signaling indicates the existence of QCL association between the backhaul link and the PDSCH of the control link, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration corresponding to the PDSCH.

[0091] Optionally, when the control link schedules a dynamic PDSCH and a semi-static PDSCH, the downlink signal of the backhaul link may preferentially select the TCI configuration corresponding to the semi-static PDSCH (that is, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI corresponding to the semi-static PDSCH). That is, the control link includes a PDSCH with dynamic scheduling and a PDSCH with semi-persistent scheduling (SPS). Considering that the backhaul link needs to be on for a long time, therefore, the TCI configuration of the downlink signal of the backhaul link may be the same as or partially the same as the TCI configuration corresponding to the semi-static scheduled PDSCH of the control link.

[0092] The details of the specific implementation in such a case are exemplified as follows.

[0093] Optionally, from the perspective of the relay device, within v2 time units after PDSCH transmission, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the PDSCH of the control link. From the perspective of the network-side device, within v2 time units after PDSCH transmission, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH of the control link. Optionally, the value of v2 is defined by the protocol or explicitly configured by the network side or remains valid until a new TCI configuration is configured for the PDSCH or until the next control link PDSCH transmission.

[0094] Optionally, for semi-static scheduling PDSCH, from the perspective of the relay device, starting from v3 time units after the SPS activation signaling of the PDSCH is transmitted, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the semi-static scheduling PDSCH of the control link. From the perspective of the network-side device, starting from v3 time units after the SPS activation signaling of the PDSCH is transmitted, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the semi-static scheduling PDSCH of the control link. The v3 time units are equal to or greater than the quasi-collocation time duration (timeDurationForQCL).

[0095] Optionally, from the perspective of the relay device, within v4 time units after the feedback signaling corresponding to the SPS activation signaling of the PDSCH is transmitted, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the PDSCH in the semi-static scheduling of the control link. From the perspective of the network-side device, within v4 time units after the feedback signaling corresponding to the SPS activation signaling of the PDSCH is transmitted, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH in the semi-static scheduling of the control link. The v4 time units are greater than or equal to the pseudo-collocation time length (timeDurationForQCL).

[0096] Optionally, from the perspective of the relay device, from the first PDSCH resource of the SPS, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the PDSCH in the semi-static scheduling of the control link. From the perspective of the network-side device, from the first PDSCH resource of the SPS, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH in the semi-static scheduling of the control link.

[0097] Optionally, from the perspective of the relay device, within v5 time units after the PDSCH transmission in the semi-static scheduling of the control link, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the PDSCH in the semi-static scheduling of the control link. From the perspective of the network-side device, within v5 time units after the PDSCH transmission in the semi-static scheduling of the control link, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH in the semi-static scheduling of the control link. Here, this time unit is, for example, a slot or a symbol or a millisecond (ms).

[0098] Optionally, from the perspective of the relay device, within v6 time units after the last valid PDSCH of the SPS, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the PDSCH of the semi-static scheduling of the control link. From the perspective of the network-side device, within v6 time units after the last valid PDSCH of the SPS, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH of the semi-static scheduling of the control link.

[0099] Optionally, from the perspective of the relay device, within v7 time units after the relay device receives the SPS deactivation signaling, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the PDSCH of the semi-static scheduling of the control link. From the perspective of the network-side device, within v7 time units after the relay device receives the SPS deactivation signaling, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH of the semi-static scheduling of the control link.

[0100] Here, it should be noted that the TCI configuration of the semi-static PDSCH is valid until the control link receives new TCI activation signaling / configuration signaling and re-instructs the TCI configuration for this semi-static PDSCH, or until the TCI indication information of the new semi-static PDSCH activation signaling / configuration signaling starts to be activated.

[0101] That is, after the activation time of the current backhaul link TCI configuration ends, the backhaul link of the relay device re-determines the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set according to the protocol regulations or the indication of the first configuration signaling. For example, after the semi-static PDSCH is deactivated, the TCI configuration of the downlink signal of the backhaul link is determined using the TCI configuration of the dynamically scheduled PDSCH or PDCCH or the SSB selected by the control link in the most recent random access process.

[0102] Also, it should be noted that for a time period when the PDCCH / PDSCH / CSI-RS beams are not activated (for example, in a certain scenario, no beam is configured for PDCCH / PDSCH / CSI-RS, or a beam is configured but not activated), the receiving beam of the downlink signal of the backhaul link of the relay device may adopt the SSB beam by default, or may adopt the beam indicated by dedicated signaling.

[0103] Case A-2: When the first configuration signaling includes target identification information, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration indicated by the target identification information, and the target identification information indicates one TCI configuration among the candidate TCI configuration sets of the control link.

[0104] Optionally, the TCI configuration indicated by the target identification information is one of the M candidate TCI configurations indicated in the upper layer configuration information, or one of the N TCI configurations indicated in the TCI activation command of the control link, where M and N are both integers greater than 0. Here, the N TCI configurations are part of the M TCI configurations.

[0105] That is, the TCI configuration of the downlink signal of the backhaul link of the relay device may be selected from the M candidate TCI configurations provided in the upper layer configuration information (for example, PDSCH-Config), or may be selected from the N TCI configurations in the TCI activation command of the MAC CE of the control link.

[0106] For example, the base station may first configure M candidate TCI configurations for the control link of the NCR by means of RRC signaling, and then select N configurations from these M candidate TCI configurations for the control link of the relay device by means of MAC CE signaling, thereby selecting one from the M candidate TCI configurations, or selecting one from the N candidate TCI configurations, and the selected TCI configuration can be carried by DCI.

[0107] As can be understood, since the M candidate TCI configurations in the upper layer configuration information (PDSCH-Config) or the N candidate TCI configurations in the TCI activation command are configured based on the SSB or CSI-RS in the control link of the relay device, it is essentially a special case of the downlink reference signal on the control link of the relay device being the related signal of the QCL of the backhaul link (i.e., a special case of the above case 1).

[0108] Case A-3: When the first configuration signaling includes a TCI configuration, the TCI configuration of the downlink signal of the backhaul link is the TCI configuration in the first configuration signaling.

[0109] That is, the specific parameters of the TCI configuration of the backhaul link of the relay device may be directly indicated by further dedicated signaling (i.e., the above first configuration signaling). For example, in the first configuration signaling, the indication information (such as the ID number) and the QCL type of the CSI-RS or SSB in the control link are indicated.

[0110] Here, when the QCL type is indicated in the protocol specification (i.e., default), it may be omitted to indicate the QCL type in the first configuration signaling.

[0111] Optionally, it should be noted that if the relay device did not receive a new QCL configuration (i.e., the downlink reference signal of the control link where the backhaul link of the relay device is associated with QCL did not change, and the QCL type associated with both did not change), or if the TCI configuration of the reference channel (i.e., the downlink physical channel of the control link where the backhaul link of the relay device is associated with QCL) did not change, the relay device maintains the conventional QCL relationship and TCI configuration as they are.

[0112] Case A-4: Optionally, the TCI configuration of the downlink signal of the backhaul link is determined based on the one with the highest priority or the one closest to the current time in the downlink reference signal and the downlink physical channel of the control link.

[0113] As will be understood hereinafter, the priority between the downlink reference signal (e.g., CSI-RS, SSB) and the downlink physical channel (e.g., PDCCH and PDSCH) may be defined according to the protocol regulations to select the physical channel of the control link. For example, assuming that the SSB priority is lower than the PDCCH priority and lower than the PDSCH priority, if the dedicated TCI for the PDCCH and PDSCH is not configured, the backhaul link of the relay device selects to use the SSB as the reference channel with the QCL configuration. When the TCI of the PDCCH is configured in the network-side device but the TCI of the PDSCH is not configured, the backhaul link of the relay device selects and operates according to the TCI configuration of the PDCCH. When the network-side device configures the TCI of the PDSCH, the backhaul link of the relay device selects and operates according to the TCI configuration of the PDSCH. Further, for example, among multiple different types of CORESETs of the control link PDCCH, it is defined that the CORESET with the smallest CORESET number has the highest priority. Also, for example, when multiple CSI-RS and / or SSB are configured on the control link, the reference signal with the smallest port number is preferentially selected as the reference signal included in the TCI configuration of the downlink signal of the backhaul link. Also, for example, when the control link is configured with a dynamically scheduled PDSCH and a semi-statically scheduled PDSCH, the TCI configuration of the semi-statically scheduled PDSCH is preferentially selected as the TCI configuration of the downlink signal of the backhaul link.

[0114] Similarly, assuming that the SSB priority is lower than the PDSCH priority and lower than the PDCCH priority, a selection scheme for similar channels or reference signals may be defined, which will not be repeated here.

[0115] Also, according to the proximity principle, before turning on the backhaul link of the relay device, the TCI configuration used for the transmission of the most recently transmitted control link physical channel (one of SSB, PDCCH, PDSCH, CSI-RS) may be selected.

[0116] Further, the protocol specification may further instruct to determine the TCI configuration of the downlink signal according to the priority of the protocol version in which the control link operates. For example, the control link configures the TCI configuration of the downlink signal of the control link (i.e., configures the TCI configuration of the downlink signal by the upper layer signaling information DLorJoint-TCIState or UL-TCIState) according to the Rel-17 protocol version, and the backhaul link preferentially determines the candidate beam set according to the TCI configuration of the control link Rel-17 protocol version, or determines the TCI configuration of the physical channel of the control link, or directly sets the TCI configuration of the downlink signal of the backhaul link and the transmission configuration of the corresponding uplink signal.

[0117] Here, the solution of configuring the candidate beam set of the backhaul link based on the candidate control link TCI configuration set configured in DLorJoint-TCIState or UL-TCIState and determining the TCI configuration of the downlink signal of the backhaul link belongs to the parallel solution with the solutions described in the above cases A-1 to A-4. Optionally, the solution of determining the TCI configuration of the downlink signal of the backhaul link based on the TCI configuration that has been activated and used in the candidate TCI configuration set configured in DLorJoint-TCIState or UL-TCIState may be set as the solution with the highest priority, that is, when DLorJoint-TCIState or UL-TCIState exists, the TCI configuration of the downlink signal of the backhaul link is determined based on the TCI configuration in DLorJoint-TCIState or UL-TCIState, and when DLorJoint-TCIState and UL-TCIState do not exist, the candidate beam set determines to adopt the solutions described in the above cases A-1 to A-4 according to the TCI configuration (i.e., PDSCH-Config) that configures the downlink signal of the control link in the Rel-15 / 16 protocol version.

[0118] Optionally, the method is If there is an overlap in the transmission of the backhaul link and the control link within the target time, the relay device The relay device performs downlink signal reception of the backhaul link using the target TCI configuration or performs uplink signal transfer of the backhaul link using the target uplink transmission configuration, The relay device further includes performing one of not performing downlink signal transfer of the backhaul link or not performing uplink signal transfer of the backhaul link within the target time, Here, the target TCI configuration is one of the TCI configurations used by the control link within the target time, and the target uplink transmission configuration is the uplink transmission configuration used by the control link within the target time, The target time includes at least one of the time unit of the transmission of the control link of the relay device, a time units before the transmission of the control link, and b time units after the transmission of the control link, where a and b each represent an integer greater than zero, and the time unit is one of an orthogonal frequency division multiplexing symbol, a slot, a subframe, and a radio frame.

[0119] In addition, the transmission of the control link of the relay device includes downlink signal reception and uplink signal transmission of the control link.

[0120] As can be seen from this, it may be defined that the priority of the TCI configuration of the downlink signal of the backhaul link of the relay device is lower than the priority of the TCI configuration of the control link of the relay device.

[0121] For example, when there is an overlap in the transmission of the backhaul link of the relay device and the control link of the relay device (including receiving the downlink signal of the control link and transmitting the uplink signal), the relay device may receive the downlink signal of the backhaul link using the TCI configuration of the control link of the relay device, or perform uplink signal transfer using the uplink transmission configuration of the control link of the relay device, or the relay device may not perform signal transfer to the backhaul link within the transmission time band of the control link.

[0122] Optionally, based on protocol regulations, when there is a time overlap between the transmission of different reference signals or physical channels of the control link and the transmission of the backhaul link, the solutions executed by the relay device may be determined respectively. For example, for the transmission time band of the PDCCH or PDSCH of the control link, the backhaul link performs downlink signal transmission of the backhaul link according to the TCI configuration of the PDCCH or PDSCH of the control link. For the transmission time band of the PUCCH or PUSCH of the control link, the backhaul link does not transmit the uplink signal. For the transmission time band of the CSI-RS of the control link, the backhaul link does not transmit the downlink signal.

[0123] Optionally, the method When the TCI configuration of the control link is updated, or when the relay device receives a new TCI configuration of the downlink signal of the backhaul link transmitted by the network-side device, or when the relay device receives the sixth configuration signaling transmitted by the network-side device, the relay device further includes updating and activating the new TCI configuration of the downlink signal of the backhaul link. Here, the sixth configuration signaling is used to instruct to update the TCI configuration of the downlink signal of the backhaul link.

[0124] As can be seen from this, the valid time of the TCI configuration of the downlink signal of the backhaul link may be static or adaptive.

[0125] For example, after the TCI configuration of the downlink signal of the backhaul link of the relay device is determined, the network-side device explicitly configures or refers to the new TCI configuration of the downlink signal of the backhaul link, or is always valid until the TCI configuration of the physical channel of the control link to which it refers is changed. Or, for example, the TCI configuration of the downlink signal of the backhaul link of the relay device is valid within a certain time after being determined, and the length of the valid time is indicated by the protocol specification or explicitly indicated by the network-side device. Or, for example, the TCI configuration of the downlink signal of the backhaul link of the relay device is always the same as or partially the same as the TCI configuration most recently used for the control link of the relay device, that is, the TCI configuration of the downlink signal of the backhaul link remains valid until the next signal transmission of the control link. Or, for example, the protocol specification states that there is a QCL relationship in the PDCCH of the backhaul link and the control link of the relay device, and when the PDCCH of the control link updates the TCI configuration, the backhaul link of the relay device also updates the TCI configuration accordingly, and the activation time of the TCI configuration of the backhaul link is not earlier than the activation time of the TCI configuration of the control link (for example, the TCI configuration of the backhaul link is activated immediately after the TCI configuration of the PDCCH of the control link is activated).

[0126] Or, for example, the protocol specification states that there is a QCL relationship in the PDSCH of the backhaul link and the control link of the relay device, and when the PDSCH of the control link updates the TCI configuration, the backhaul link of the relay device also updates the TCI configuration accordingly, and the activation time of the TCI configuration of the backhaul link is not earlier than the activation time of the TCI configuration of the control link (for example, the TCI configuration of the backhaul link is activated immediately after the TCI configuration of the PDSCH of the control link is activated).

[0127] Optionally, after the relay device updates and activates a new TCI configuration of the downlink signal of the backhaul link, the method is as follows: The relay device keeps the amplification factor of the downlink signal of the backhaul link unchanged; adjusts the amplification factor of the downlink signal of the backhaul link based on a first amplification factor, where the first amplification factor is carried in a third configuration signaling transmitted by the network-side device; adjusts the amplification factor of the downlink signal of the backhaul link based on the difference between a first channel measurement result and a second channel measurement result; wherein one of the first channel measurement result and the second channel measurement result is a channel measurement result before and after the new TCI configuration of the downlink signal of the backhaul link is updated and activated.

[0128] In addition, the third configuration signaling and the first configuration signaling may be the same or different, and the channel measurement result may include at least one of the reference signal receiving power (RSRP) after L1 filtering, the reference signal receiving quality (RSRQ), and the signal to interference plus noise ratio (SINR).

[0129] As can be seen, when the backhaul link of the relay device updates the TCI configuration of the downlink signal, one of the following options 1 to 3 may be adopted for the processing of the amplification factor of the downlink signal.

[0130] Option 1: The amplification factor of the downlink signal of the backhaul link of the relay device does not change.

[0131] Solution 2: When the adjustment value of the amplification factor is indicated by dedicated signaling (for example, the above-mentioned third configuration signaling), the relay device updates the amplification factor of the downlink signal of the backhaul link based on the adjustment value.

[0132] Solution 3: The relay device self-adjusts the amplification factor of the downlink signal of the backhaul link based on the difference between the channel measurement result before the update of the TCI configuration of the downlink signal and the channel measurement result after the update.

[0133] Optionally, the transmission configuration of the uplink signal of the backhaul link indicates the transmission spatial domain filter of the uplink signal of the backhaul link, the spatial receiver parameter of the downlink signal of the backhaul link, the transmission spatial domain filter of one uplink signal of the control link, and is related to at least one of the reception spatial domain filter of one downlink signal of the control link.

[0134] Here, the uplink signal transmission beam of the backhaul link of the relay device refers to the transmission spatial domain filter transmitted by the uplink signal, and indicates the energy distribution situation in different directions of the uplink signal energy.

[0135] As can be seen from the above, in the embodiments of the present application, the transmission configuration of the uplink signal of the backhaul link of the relay device may be determined based on the downlink signal of the backhaul link, or the uplink signal of the control link, or the downlink signal of the control link.

[0136] Optionally, the relay device determines the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set, Based on the protocol regulations, the relay device directly determines the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set. Or, The relay device receives the fourth configuration signaling transmitted by the network-side device. Based on the fourth configuration signaling, the relay device determines the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set. Or, The relay device determines the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set. Based on the protocol regulations, the relay device determines the transmission configuration of the uplink signal of the backhaul link based on the TCI configuration of the downlink signal of the backhaul link.

[0137] Here, since the protocol regulations or the fourth configuration signaling contains relevant information about the transmission configuration of the uplink signal of the backhaul link, the relay device can determine the transmission configuration of the uplink signal of the backhaul link based on the protocol regulations or the fourth configuration signaling and based on the candidate beam set.

[0138] As can be seen from this, in the embodiments of the present application, the relay device may determine the transmission beam of the uplink signal of the backhaul link using the following Method 1 or Method 2 or Method 3.

[0139] Method 1: Based on the protocol regulations, directly determine the transmission beam of the uplink signal of the backhaul link based on the candidate beam set of the control link. Method 2: Based on the received fourth configuration signaling, determine the transmission beam of the uplink signal of the backhaul link based on the candidate beam set of the control link. Method 3: After determining the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set, the relay device determines the transmission configuration of the uplink signal of the backhaul link based on the TCI configuration of the downlink signal of the backhaul link according to the protocol regulations.

[0140] As can be understood, here, Method 1 and Method 2 may be integrated into one solution. For example, when the network-side device does not configure the transmission beam of the uplink signal using dedicated signaling (i.e., the above fourth configuration signaling), the relay device may determine the transmission beam of the uplink signal (i.e., Method 1) according to the prior regulations of the protocol, and after receiving the dedicated signaling (i.e., the above fourth configuration signaling), determine the transmission beam of the uplink signal based on the dedicated signaling.

[0141] Similarly, here, Method 3 and Method 2 may be integrated into one solution. For example, when the network-side device does not configure the transmission beam of the uplink signal using dedicated signaling (i.e., the above fourth configuration signaling), the relay device may determine the transmission beam of the uplink signal using the above Method 3 according to the prior regulations of the protocol, and after receiving the dedicated signaling (i.e., the above fourth configuration signaling), determine the transmission beam of the uplink signal based on the dedicated signaling.

[0142] Here, the above fourth configuration signaling may be MAC CE, RRC, or DCI.

[0143] Optionally, the relay device's determination of the transmission configuration of the uplink signal of the backhaul link can be divided into the following cases B-1 to B-4.

[0144] Case B-1: The protocol regulations indicate that the transmission spatial region filter of the uplink signal of the backhaul link is related to the spatial receiver parameters of the downlink signal of the backhaul link.

[0145] That is, the transmission beam of the uplink signal of the backhaul link of the relay device may be the same as the reception beam of the downlink signal.

[0146] Case B-2: The protocol regulation or the fourth configuration signaling indicates that the transmission configuration of the uplink signal of the backhaul link is determined based on the uplink reference signal and / or the configuration of the uplink physical channel of the control link.

[0147] Here, the uplink reference signal of the control link may be SRS and / or PRACH, and the uplink physical channel of the backhaul link may be PUCCH or PUSCH. That is, the backhaul link of the relay device can determine the transmission beam of the uplink signal of the backhaul link based on the PUCCH channel or PUSCH channel or SRS of the control link of the relay device. For example, the relay device determines the transmission beam of the uplink signal of the backhaul link based on the configuration of the most recent uplink transmission (PUCCH or PUSCH or SRS).

[0148] In the following, different cases of determining the transmission beam of the uplink signal of the backhaul link of the relay device based on the PUCCH channel or PUSCH channel or SRS of the control link of the relay device will be described respectively.

[0149] (1) Use the SRS transmission beam as the transmission beam of the uplink signal of the backhaul link of the relay device. Specifically, in the time-frequency resource of the SRS transmission, the transmission beam of the uplink signal of the backhaul link of the relay device may coincide with the transmission beam of this SRS.

[0150] (2) Use the PUCCH transmission beam as the transmission beam of the uplink signal of the backhaul link of the relay device. Specifically, In the time-frequency resource where the PUCCH is located, the transmission beam of the uplink signal of the backhaul link of the relay device coincides with the transmission beam of this PUCCH, and Within v8 time units after the PUCCH, the transmission beam of the uplink signal of the backhaul link of the relay device coincides with the transmission beam of this PUCCH, where this time unit may be, for example, one of a slot or a symbol or a millisecond (ms).

[0151] (3) Use the transmission beam of the PUSCH as the transmission beam of the uplink signal of the backhaul link of the relay device. Specifically, In the transmission time-frequency resource of the PUSCH, the transmission beam of the uplink signal of the backhaul link of the relay device coincides with the transmission beam of this PUSCH, and From v9 time units after the PUSCH scheduling signaling is transmitted, the transmission beam of the uplink signal of the backhaul link of the relay device coincides with the transmission beam of this PUSCH. Optionally, the v9 time units are greater than or equal to timeDurationForQCL, and From v10 time units after the semi-static PUSCH activation signaling is transmitted, the transmission beam of the uplink signal of the backhaul link of the relay device coincides with the transmission beam of this semi-static PUSCH, and From v11 time units after the feedback signaling corresponding to the semi-static PUSCH activation signaling is transmitted, the transmission beam of the uplink signal of the backhaul link of the relay device coincides with the transmission beam of this semi-static PUSCH, and From the first PUSCH resource of the semi-static scheduling, the transmission beam of the uplink signal of the backhaul link of the relay device coincides with the transmission beam of this semi-static PUSCH, and Within v12 time units after PUSCH transmission, the transmission beam of the uplink signal on the backhaul link of the relay device shall match the transmission beam of this PUSCH, where this time unit is, for example, a slot or a symbol or a millisecond (ms). Within v13 time units after the last valid PUSCH of the semi-static PUSCH, the transmission beam of the uplink signal on the backhaul link of the relay device shall match the transmission beam of this semi-static PUSCH, where this time unit is, for example, a slot or a symbol or a millisecond (ms). Within v14 time units after the relay device receives the semi-static PUSCH deactivation signaling, the transmission beam of the uplink signal on the backhaul link of the relay device may be one of the following: matching the transmission beam of this semi-static PUSCH.

[0152] Here, it should be noted that the semi-static PUSCH resource is a valid resource until the control link receives new activation signaling / configuration signaling and re-instructs information such as the transmission resource / transmission beam for this semi-static PUSCH, or until the instruction information of the new activation signaling / configuration signaling starts to be activated.

[0153] Also, for a certain time period, when the transmission beam of the uplink signal on the backhaul link of the relay device cannot be determined based on the PUCCH / PUSCH / SRS beam, by default, the beam of the SSB / CSI-RS is adopted as the related signal of the transmission beam of the uplink signal on the backhaul link of the relay device, and the SSB / CSI-RS is the downlink reference signal selected by the control link when it recently executed random access.

[0154] Case B-3: The protocol regulation or the fourth configuration signaling indicates that the transmission configuration of the uplink signal on the backhaul link is determined based on the downlink reference signal and / or the downlink physical channel of the control link.

[0155] Here, for the specific cases of determining the transmission configuration of the uplink signal based on the downlink reference signal and / or the downlink physical channel of the control link, they are similar to the specific cases of determining the TCI configuration of the downlink signal based on the downlink reference signal and / or the downlink physical channel of the control link. Reference can be made to the foregoing description and will not be elaborated herein further.

[0156] Also, it should be noted that for the time period when the PDCCH / PDSCH / CSI-RS beam is not activated, the transmission beam of the uplink signal of the backhaul link of the relay device may use the beam indicated by dedicated signaling.

[0157] Case B-4: The fourth configuration signaling indicates that one of the target candidate configurations is the transmission configuration of the uplink signal of the backhaul link, where the target candidate configuration includes the configuration indicated by the uplink signal configuration information configured on the control link.

[0158] That is, the uplink signal configuration information (PUCCH-SpatialRelationInfo) configured on the control link of the relay device by dedicated signaling (such as the foregoing fourth configuration signaling) can be used as the candidate configuration of the transmission beam of the uplink signal of the backhaul link, and one of the configurations can be indicated as the transmission beam configuration of the uplink signal of the backhaul link of the relay device. For example, when DLorJoint-TCIState or UL-TCIState exists, the transmission configuration of the uplink signal of the backhaul link of the relay device may be determined based on the TCI configuration in DLorJoint-TCIState or UL-TCIState. Here, when DLorJoint-TCIState and UL-TCIState do not exist, the solutions described in Cases B-1 to B-3 above may be adopted to determine the transmission beam configuration of the uplink signal of the backhaul link of the relay device.

[0159] Optionally, after the uplink transmission configuration of the backhaul link is updated, the method is as follows: The relay device Keeps the amplification factor of the uplink signal of the backhaul link unchanged; Adjusts the amplification factor of the uplink signal of the backhaul link based on a second amplification factor, where the second amplification factor is carried in a fifth configuration signaling transmitted by a network-side device; Adjusts the amplification factor of the uplink signal of the backhaul link based on the difference between a third channel measurement result and a fourth channel measurement result, where the third channel measurement result and the fourth channel measurement result are respectively one of the channel measurement results before and after the update of the transmission configuration of the uplink signal of the backhaul link. The method further includes performing one of the above.

[0160] It should also be noted that the update of the uplink transmission configuration of the backhaul link described herein may refer to updating the uplink transmission configuration of the backhaul link using the method for determining the uplink transmission configuration described in Cases B-1 to B-4 above.

[0161] Also, the fifth configuration signaling and the fourth configuration signaling may be the same or different, and the channel measurement result may include at least one of the reference signal receiving power (RSRP) after L1 filtering, the reference signal receiving quality (RSRQ), and the signal to interference plus noise ratio (SINR).

[0162] As can be understood hereinafter, when the backhaul link of the relay device updates the transmission configuration of the uplink signal, one of the following Solutions 1 to 3 may be adopted for the processing of the amplification factor of the uplink signal.

[0163] Solution 1: The amplification factor of the uplink signal of the backhaul link of the relay device does not change.

[0164] Solution 2: When the adjustment value (i.e., the second adjustment value) of the amplification factor is indicated by dedicated signaling (e.g., the fifth configuration signaling above), the relay device updates the amplification factor of the uplink signal of the backhaul link based on the adjustment value.

[0165] Solution 3: The relay device self-adjusts the amplification factor of the uplink signal of the backhaul link based on the difference between the channel measurement result before the update of the transmission configuration of the uplink signal and the channel measurement result after the update.

[0166] Solution 4: The adjustment value of the amplification factor of the uplink signal of the backhaul link of the relay device multiplexes the adjustment value of the amplification factor of the downlink signal of the backhaul link of the relay device.

[0167] Here, the second adjustment value carried in the fifth configuration signaling above may be an adjustment value based on the amplification factor of the downlink signal, or may be an adjustment value based on the amplification factor of the conventional uplink signal.

[0168] Here, it should be noted that the amplification factor of the uplink signal of the backhaul link of the relay device may be the same as or different from the amplification factor of the downlink signal. The network-side device may configure the amplification factor of the uplink signal and the amplification factor of the downlink signal of the backhaul link (or the offset value / correction value of the amplification factor of the uplink signal with respect to the amplification factor of the downlink signal) respectively.

[0169] Alternatively, selectively, for the backhaul link, within the time period when the TCI configuration of the control link with the Rel-17 protocol version (the TCI configuration indicated in DL or Joint-TCIState or UL-TCIState) is enabled, the beams of the backhaul link and the control link may be maintained to be consistent. That is, the transmission beam of the downlink signal of the backhaul link of the relay device shall be consistent with the transmission beam of the downlink signal of the control link, and the transmission beam of the uplink signal of the backhaul link of the relay device shall be consistent with the transmission beam of the uplink signal of the control link.

[0170] Selectively, for the backhaul link, within v14 time units after the TCI indication information of the control link is transmitted, within v14 time units after the next TCI indication information of the control link is transmitted, or within v15 time units transmitted by the feedback information corresponding to the next TCI indication information, the reception beam of the downlink signal and the transmission beam of the uplink signal of the backhaul link of the relay device shall be determined based on the beam of the TCI indication.

[0171] Selectively, for the SSB / PRACH of the control link, the time domain unit where some specified SRS / CSI-RS / CORESET are located (or this time domain unit extends one time period forward and / or backward) may use the beam determination method described in the above cases A-1 to A-4 and the above cases B-1 to B-4.

[0172] The effective time of the transmission configuration of the uplink signal of the backhaul link of the relay device may be indicated statically, adaptively, or semi-statically (i.e., when indicating the transmission configuration of the uplink signal of the backhaul link, the length of the effective time is also indicated).

[0173] For example, after the transmission configuration of the uplink signal of the backhaul link of the relay device is determined, the network-side device explicitly configures a new transmission configuration for the uplink signal of the backhaul link, or it remains valid until the transmission configuration of the physical channel of the control link for reference is changed. Or, for example, after the transmission configuration of the uplink signal of the backhaul link of the relay device is determined, it is valid within a certain period of time, and the length of the valid time is indicated by the protocol regulations or explicitly indicated by the network-side device. Or, for example, the transmission configuration of the uplink signal of the backhaul link of the relay device is always the same as the transmission configuration of the uplink signal most recently used by the control link of the relay device, that is, the transmission configuration of the uplink signal of the backhaul link of the relay device remains valid until the next uplink signal transmission of the control link. Or, for example, the protocol regulations indicate that there is a QCL relationship in the PUCCH of the backhaul link and the control link of the relay device, and when the PUCCH of the control link updates the transmission configuration, the backhaul link of the relay device also updates the transmission configuration of the uplink signal accordingly, and the activation time of the transmission configuration of the uplink signal of the backhaul link is not earlier than the activation time of the PUCCH transmission configuration of the control link (for example, the transmission configuration of the uplink signal of the backhaul link is activated immediately after the transmission configuration of the PUCCH of the control link is activated).

[0174] Or, for example, the protocol regulations indicate that there is a QCL relationship in the PUSCH of the backhaul link and the control link of the relay device, and when the PUSCH of the control link updates the transmission configuration, the backhaul link of the relay device also updates the transmission configuration of the uplink signal accordingly, and the activation time of the transmission configuration of the uplink signal of the backhaul link is not earlier than the activation time of the PUSCH transmission configuration of the control link (for example, the transmission configuration of the uplink signal of the backhaul link is activated immediately after the transmission configuration of the PUSCH of the control link is activated).

[0175] Alternatively, for example, the protocol stipulates that the uplink transmission configuration of the backhaul link of the relay device is related to the downlink signal TCI configuration of the backhaul link, and when the downlink TCI configuration of the backhaul link is updated, the backhaul link of the relay device also updates the transmission configuration of the uplink signal accordingly, and the activation time of the transmission configuration of the uplink signal of the backhaul link is not earlier than the activation time of the downlink signal TCI configuration of the backhaul link.

[0176] Also, the relay device described in this specification may be a relay device having a signal transfer function such as NCR, or a Reconfigurable Intelligence Surface (RIS), a metasurface, a reflecting surface, an intelligent reflecting surface, etc.

[0177] To summarize the above, in the embodiments of this application, assuming that the control link and the backhaul link of the relay device share radio frequency hardware, the backhaul link of the relay device can determine its own transmission and reception beams by using the beam training or beamforming information of the control link, thereby reducing the complexity of beam control of the backhaul link of the relay device and avoiding additional beam training overhead.

[0178] According to a second aspect, referring to FIG. 4, the embodiments of this application provide a method for determining the transmission configuration of a backhaul link, and this method may include the following steps.

[0179] Step 401: The network-side device determines a set of candidate beams that can be configured for the control link.

[0180] Step 402: The network-side device transmits beam configuration signaling for the backhaul link to the relay device.

[0181] Here, the beam configuration signaling is used to instruct the relay device to determine the transmission configuration indication (TCI) configuration of the downlink signal and / or the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set that can configure the control link.

[0182] In addition, this beam configuration signaling may further include the aforementioned first configuration signaling and / or fourth configuration signaling, where the first configuration signaling is used to instruct the relay device to determine the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set of the control link, and the fourth configuration signaling is used to instruct the relay device to determine the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set of the control link.

[0183] That is, the indication information for instructing to determine the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set of the control link, and the indication information for instructing to determine the uplink transmission configuration of the backhaul link based on the candidate beam set of the control link may be carried in the same signaling or different signaling.

[0184] Step 403: The network-side device determines the transmission beam of the downlink signal and / or the reception beam of the uplink signal of the backhaul link based on the candidate beam set according to the beam configuration signaling or protocol specification.

[0185] Here, in step 403, the transmission beam of the downlink signal and / or the reception beam of the uplink signal in the backhaul link of the network-side device is determined.

[0186] What needs to be explained here is that the backhaul link is a link between the relay device and the network-side device. In the backhaul link, the network-side device transmits a downlink signal, the relay device receives the downlink signal, the relay device transmits the downlink signal, and the network-side device receives the downlink signal.

[0187] Here, after the network-side device transmits the beam configuration signaling to the relay device, the relay device can determine the transmission configuration indication TCI configuration of the downlink signal of the backhaul link and / or the transmission configuration of the uplink signal based on the candidate beam set of the control link (that is, determine the receiving beam of the downlink signal and / or the transmitting beam of the uplink signal in the backhaul link of the relay device). For the network-side device, based on the beam configuration signaling or protocol regulations, and based on the candidate beam set of the control link, it can determine the transmitting beam of the downlink signal and / or the receiving beam of the uplink signal of the backhaul link.

[0188] As will be understood hereinafter, in the embodiments of the present application, the network-side device can send beam configuration signaling of the backhaul link to the relay device, whereby the relay device can determine the TCI configuration of the downlink signal and / or the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set of the control link, and the network-side device can also determine the transmission beam of the downlink signal and / or the reception beam of the uplink signal of the backhaul link based on this beam configuration signaling or protocol provisions based on the candidate beam set of the control link. That is, in the embodiments of the present application, the reception beam of the downlink signal and / or the transmission beam of the uplink signal in the backhaul link of the relay device can be selected from the candidate beam set of the control link, and the transmission beam of the downlink signal and / or the reception beam of the uplink signal in the backhaul link of the network-side device can also be selected. Therefore, the embodiments of the present application provide a method for determining the reception beam of the downlink signal and / or the transmission beam of the uplink signal in the backhaul link.

[0189] Optionally, the candidate beam set includes at least one of a beam corresponding to the candidate TCI configuration information of the control link, a beam corresponding to the downlink reference signal of the control link, a beam corresponding to the downlink physical channel of the control link, a beam corresponding to the uplink reference signal of the control link, and a beam corresponding to the uplink physical channel of the control link.

[0190] Here, the candidate TCI configuration described above is an available but not yet activated TCI configuration. The downlink reference signal of the control link described above may include SSB and / or CSI-RS. The downlink physical channel of the control link described above may include PDCCH and / or PDSCH. The uplink reference signal of the control link described above may include SRS and / or PRACH. The uplink physical channel of the control link described above may include PUCCH and / or PUSCH.

[0191] Optionally, the network-side device determining the transmission beam of the downlink signal of the backhaul link based on the candidate beam set can be divided into case C-1 to case C-4 described below.

[0192] Case C-1: When the protocol specification or the beam configuration signaling indicates that there is a QCL relationship between the downlink reference signal of the control link and / or the downlink physical channel and the backhaul link, the transmission beam of the downlink signal of the backhaul link is determined based on the downlink reference signal of the control link and / or the downlink physical channel.

[0193] The situation of case C-1 is specifically described below.

[0194] C-1.1: Optionally, when the protocol specification or the beam configuration signaling indicates that there is a QCL relationship between the downlink reference signal of the control link and the backhaul link, the transmission beam of the downlink signal of the backhaul link is the same as the transmission beam of the downlink reference signal of the control link.

[0195] Here, the downlink reference signal of the control link described above may be SSB or CSI-RS.

[0196] In the following, different cases will be described where the downlink reference signals for establishing the backhaul link and QCL-related are SSB and CSI-RS respectively.

[0197] (1) When the protocol specification or beam configuration signaling indicates that there is a QCL relationship in the SSB of the backhaul link and the control link, the relay device may select the transmission beam of the SSB used in the most recent random access process for the control link and the transmission beam of the downlink signal of the backhaul link. The specific implementation details may be as follows.

[0198] Optionally: From the perspective of the network-side device, in the time-frequency resource transmitted by the SSB, the transmission beam of the downlink signal of the backhaul link coincides with the transmission beam of the SSB of the control link.

[0199] Optionally, there is a QCL relationship between the SSB of the control link and the backhaul link, and the second configuration signaling transmitted from the network-side device to the relay device carries the identification information (e.g., SSB number) of the SSB. In this case, the transmission beam of the downlink signal of the backhaul link is the same as the transmission beam of the SSB corresponding to the identification information of the SSB carried in the second configuration signaling. Here, the second configuration signaling may be MAC CE or RRC or DCI. Also, this second configuration signaling may be the same as or different from the above beam configuration signaling.

[0200] Here, the SSB indicated by the identification information of the SSB carried in the second configuration signaling may be different from the SSB in the process where the relay device randomly accesses.

[0201] (2) When the protocol specification or beam configuration signaling indicates that there is a QCL relationship in the CSI-RS of the backhaul link and the control link, the backhaul link of the relay device selects the CSI-RS as the reference beam for QCL, and the specific implementation details are exemplified as follows.

[0202] Selectively: From the perspective of the network side device side, in the time-frequency resources transmitted by the CSI-RS, the transmission beam of the downlink signal of the backhaul link coincides with the CSI-RS transmission beam of the control link.

[0203] C-1.2: When the protocol regulation or the beam configuration signaling indicates that there is a QCL relationship between the downlink physical channel of the control link and the backhaul link, the transmission beam of the downlink signal of the backhaul link is the same as the transmission beam of the downlink physical channel of the control link.

[0204] Here, the downlink physical channel may be PDCCH or PDSCH. In the following, different cases where the downlink physical channels for establishing the QCL relationship with the backhaul link are PDCCH and PDSCH respectively will be described.

[0205] (1) When the protocol regulation or the beam configuration signaling indicates that there is a QCL relationship between the backhaul link and the PDCCH of the control link, the specific implementation details may be as follows.

[0206] Optionally, from the perspective of the network-side device, in the time-frequency resource where a specific search space of the PDCCH or a specific CORESET is located, the downlink signal transmission beam of the backhaul link coincides with the beam of the PDCCH in this specific SS or specific CORESET. Here, the determination method of the specific CORESET may be predefined by the protocol (for example, specifying that the CORESET corresponding to Type0 PDCCH is the specific CORESET, or the CORESET with the smallest CORESET number is the specific CORESET), or may be configured by the network side (that is, the identification information of the CORESET (such as the CORESET code) may be carried in the signaling transmitted by the network-side device, and the CORESET indicated by this identification information is the specific CORESET). Similarly, the determination method of the specific search space is similar to that of the specific CORESET, and will not be further described here.

[0207] Optionally, from the perspective of the network-side device, in the v1 time units after a specific search space of the PDCCH or a specific CORESET, the downlink signal transmission beam of the backhaul link coincides with the beam of the PDCCH in this specific search space or specific CORESET. Here, this time unit is, for example, a slot or a symbol or a millisecond (ms).

[0208] (2) When the protocol regulation or beam configuration signaling indicates that there is a QCL relationship in the PDSCH of the backhaul link and the control link, the transmission beam of the downlink signal of the backhaul link is the same as the transmission beam of the PDSCH.

[0209] Optionally, when the control link schedules the dynamic PDSCH and the semi-static PDSCH, the transmission beam of the downlink signal of the backhaul link can preferentially select the transmission beam of the semi-static PDSCH.

[0210] That is, the control link includes the PDSCH of dynamic scheduling and the PDSCH of semi-persistent scheduling (SPS). Considering that the backhaul link needs to be kept on for a long time, therefore, the transmission beam of the downlink signal of the backhaul link may be the same as the transmission beam of the PDSCH of the semi-persistent scheduling of the control link.

[0211] The details of the specific implementation in such a case are exemplified as follows.

[0212] Optionally, from the perspective of the network-side device, within v2 time units after the PDSCH transmission, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH of the control link. Optionally, the value of v2 is defined by the protocol or explicitly configured by the network side or is always valid until a new TCI configuration is configured for the PDSCH, or is always valid until the next control link PDCCH / PDSCH transmission.

[0213] Optionally, from the perspective of the network-side device, starting from v3 time units after the SPS activation signaling of the PDSCH is transmitted, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH of the semi-persistent scheduling of the control link. The v3 time units are greater than or equal to the quasi-collocation time length (timeDurationForQCL).

[0214] Optionally, from the perspective of the network-side device, starting from v4 time units after the feedback signaling corresponding to the SPS activation signaling of the PDSCH is transmitted, the transmission beam of the downlink signal of the backhaul link coincides with the beam of the PDSCH of the semi-persistent scheduling of the control link. The v4 time units are greater than or equal to the quasi-collocation time length (timeDurationForQCL).

[0215] Optionally, from the perspective of the network-side device, the transmission beam of the downlink signal of the backhaul link from the first PDSCH resource of the SPS is the same as the beam of the PDSCH of the semi-static scheduling of the control link.

[0216] Optionally, from the perspective of the network-side device, within v5 time units after the PDSCH transmission of the semi-static scheduling of the control link, the transmission beam of the downlink signal of the backhaul link is the same as the beam of the PDSCH of the semi-static scheduling of the control link. Here, this time unit is, for example, a slot or a symbol or a millisecond (ms).

[0217] Optionally, from the perspective of the network-side device, within v6 time units after the last valid PDSCH of the SPS, the transmission beam of the downlink signal of the backhaul link is the same as the beam of the PDSCH of the semi-static scheduling of the control link.

[0218] Optionally, from the perspective of the network-side device, within v7 time units after the relay device receives the SPS deactivation signaling, the transmission beam of the downlink signal of the backhaul link is the same as the beam of the PDSCH of the semi-static scheduling of the control link.

[0219] Here, what should be explained is that the TCI configuration of the semi-static PDSCH is valid until the control link receives new TCI activation signaling / configuration signaling and re-instructs the TCI configuration for this semi-static PDSCH, or until the TCI indication information of the new semi-static PDSCH activation signaling / configuration signaling starts to be valid.

[0220] That is, after the activation time of the downlink signal transmission beam of the current backhaul link ends, the backhaul link of the network-side device determines the downlink signal transmission beam of the backhaul link again according to protocol regulations or instructions in beam configuration signaling, based on the physical channel of the control link. For example, after the semi-static PDSCH is deactivated, the network-side device uses the transmission beam for dynamically scheduling the PDSCH or PDCCH or the transmission beam of the SSB selected in the most recent random access process of the control link to determine the downlink signal transmission beam of the backhaul link.

[0221] In addition, it should be noted that for the time period when the PDCCH / PDSCH / CSI-RS beam is not activated (for example, in a certain scenario, no beam is configured for the PDCCH / PDSCH / CSI-RS, or a beam is configured but not activated), the downlink signal transmission beam of the backhaul link of the network-side device may adopt the SSB beam by default, or may adopt the beam indicated by dedicated signaling.

[0222] C-1.3: The transmission beam of the downlink signal of the backhaul link is determined based on the transmission beam with the highest priority or the one closest to the current time in the downlink reference signal and downlink physical channel of the control link.

[0223] As will be understood hereinafter, the physical control link channel may be selected by defining the priority between the downlink reference signal (e.g., CSI-RS, SSB) and the downlink physical channel (e.g., PDCCH and PDSCH) according to the protocol regulations. For example, assuming that the SSB priority is lower than the PDCCH priority and lower than the PDSCH priority, if dedicated TCIs are not configured for PDCCH and PDSCH, the transmission beam of the downlink signal on the backhaul link of the network-side device is the same as the transmission beam of the SSB; if a TCI for PDCCH is configured for the network-side device but a TCI for PDSCH is not configured, the transmission beam of the downlink signal on the backhaul link of the network-side device is the same as the transmission beam of the PDCCH; if the network-side device configures a TCI for PDSCH, the transmission beam of the downlink signal on the backhaul link of the network-side device is the same as the transmission beam of the PDSCH. Further, for example, among multiple different types of CORESETs of the control link PDCCH, it is defined that the CORESET with the smallest CORESET number has the highest priority. Also, for example, if multiple CSI-RSs and / or SSBs are configured for the control link, the transmission beam of the reference signal with the smallest port number is preferentially selected as the transmission beam of the downlink signal on the backhaul link of the network-side device. Also, for example, if a dynamically scheduled PDSCH and a semi-statically scheduled PDSCH are configured for the control link, the transmission beam of the semi-statically scheduled PDSCH is preferentially selected as the transmission beam of the downlink signal on the backhaul link of the network-side device. Similarly, it may be assumed that the SSB priority is lower than the PDSCH priority and lower than the PDCCH priority, and the explanation will not be repeated here.

[0224] Also, in accordance with the proximity principle, before choosing to turn on the backhaul link, based on the beam of the physical channel (one of SSB, PDCCH, PDSCH, CSI-RS) of the most recently transmitted control link, the transmission beam of the downlink signal of the backhaul link of the network-side device may be determined. Case C-2: When the beam configuration signaling includes target identification information, the transmission beam of the downlink signal of the backhaul link is the same as the beam corresponding to the TCI configuration indicated by the target identification information, and the target identification information indicates one TCI configuration from among the candidate TCI configuration sets of the control link.

[0225] Optionally, the TCI configuration indicated by the target identification information is one of the M candidate TCI configurations indicated in the upper layer configuration information, or one of the N TCI configurations indicated in the TCI activation command of the control link, where M and N are both integers greater than 0. Here, the N TCI configurations are part of the M TCI configurations.

[0226] That is, the TCI configuration corresponding to the transmission beam of the downlink signal of the backhaul link of the network-side device may be selected from the M candidate TCI configurations provided in the upper layer configuration information (e.g., PDSCH-Config), or may be selected from the N TCI configurations in the TCI activation command of the MAC CE of the control link.

[0227] Case C-3: When the beam configuration signaling includes a TCI configuration, the transmission beam of the downlink signal of the backhaul link is the beam corresponding to the TCI configuration in the beam configuration signaling.

[0228] That is, the specific parameters of the TCI configuration of the backhaul link of the relay device may be directly indicated by further dedicated signaling (i.e., the above beam configuration signaling). In such a case, the transmission beam of the downlink signal of the backhaul link of the network-side device is the same as the beam corresponding to the TCI configuration in this beam configuration signaling.

[0229] Further, the protocol specification may further instruct to determine the transmission beam of the downlink signal of the backhaul link of the network-side device according to the priority of the protocol version in which the control link operates. For example, the control link configures the TCI configuration of the downlink signal of the control link (i.e., the TCI configuration of the downlink signal is configured by the upper-layer signaling information DLorJoint-TCIState or UL-TCIState) according to the Rel-17 protocol version, and the backhaul link preferentially determines the candidate beam set according to the beam corresponding to the TCI configuration of the control link Rel-17 protocol version or determines the TCI configuration of the physical channel of the control link or directly sets the transmission beam of the downlink signal of the backhaul link of the network-side device and the corresponding reception beam of the uplink signal.

[0230] Here, the solution of configuring the candidate beam set of the backhaul link based on the candidate control link TCI configuration set configured in DLorJoint-TCIState or UL-TCIState and determining the transmission beam of the downlink signal of the backhaul link of the network-side device belongs to the parallel solution with the solutions described in the aforementioned cases C-1.1 to C-1.3 and C-2 to C-3. Optionally, the solution of determining the transmission beam of the downlink signal of the backhaul link of the network-side device based on the TCI configuration that has already been activated and used in the candidate TCI configuration set configured in DLorJoint-TCIState or UL-TCIState may be set as the solution with the highest priority, that is, when DLorJoint-TCIState or UL-TCIState exists, the transmission beam of the downlink signal of the backhaul link is determined based on the TCI configuration in DLorJoint-TCIState or UL-TCIState, and when DLorJoint-TCIState and UL-TCIState do not exist, the solutions described in the aforementioned cases C-1.1 to C-1.3 and C-2 to C-3 may be adopted.

[0231] Optionally, the method When there is an overlap in the transmission of the backhaul link and the control link within the target time, the network-side device transmits the downlink signal of the backhaul link using the target transmission beam or receives the uplink signal of the backhaul link using the target reception beam, and the network-side device executes one of not transmitting the downlink signal of the backhaul link within the target time or not receiving the uplink signal of the backhaul link, where the target transmission beam is the downlink transmission beam used by the control link within the target time, and the target reception beam is the uplink reception beam used by the control link within the target time, The target time includes at least one of the time unit of transmission of the control link of the network-side device, a time units before the transmission of the control link, and b time units after the transmission of the control link, where a and b respectively represent integers greater than zero, and the time unit further includes one of an orthogonal frequency division multiplexing symbol, a slot, a subframe, and a radio frame.

[0232] In addition, the transmission of the control link of the network-side device includes downlink signal transmission and uplink signal reception of the control link.

[0233] As can be seen from this, it may be defined that the priority of the transmission beam of the downlink signal of the backhaul link of the network-side device is lower than the priority of the transmission beam of the downlink signal of the control link of the network-side device.

[0234] For example, when there is an overlap between the transmission of the backhaul link of the network-side device and the transmission of the control link of the network-side device (including downlink signal reception and uplink signal transmission of the control link) within the target time, the network-side device may use the transmission beam of the downlink signal of the control link of the network-side device to receive the downlink signal of the backhaul link, or use the reception beam of the uplink signal of the control link of the network-side device to receive the uplink signal of the backhaul link, or the network-side device may not perform signal transmission to the backhaul link within the transmission time period of the control link.

[0235] Optionally, based on protocol regulations, on the network side device side, if there is a time overlap between the transmission of different reference signals or physical channels of the control link and the transmission of the backhaul link, the solutions executed by the network side device may be determined respectively. For example, for the PDCCH or PDSCH transmission time slot of the control link, the backhaul link of the network side device performs downlink signal transmission of the backhaul link according to the TCI configuration of the PDCCH or PDSCH of the control link. For the PUCCH or PUSCH transmission time slot of the control link, the backhaul link of the network side device does not perform uplink signal reception. For the CSI-RS transmission time slot of the control link, the backhaul link of the network side device does not perform downlink signal transmission.

[0236] Also, the effective time of the transmission beam of the downlink signal of the backhaul link of the network side device may be static or adaptive or semi-static.

[0237] For example, after the transmission beam of the downlink signal of the backhaul link of the network side device is determined, it is always effective until a new transmission beam of the downlink signal of the backhaul link is configured or the transmission beam of the physical channel of the control link used as a reference is changed. Or, for example, the transmission beam of the downlink signal of the backhaul link of the network side device is effective within a certain time after being determined, and the length of the effective time is indicated by protocol regulations. Or, for example, the transmission beam of the downlink signal of the backhaul link of the network side device always coincides with the transmission beam recently used by the control link, that is, the transmission beam of the downlink signal of the backhaul link remains effective until the next signal transmission of the control link. Alternatively, for example, the protocol stipulation is that when there is a QCL relation in the PDCCH of the backhaul link and the control link, and the PDCCH of the control link updates the transmission beam, the backhaul link of the network-side device also updates the transmission beam of the downlink signal accordingly, and the activation time of the downlink signal transmission beam of the backhaul link is not earlier than the activation time of the PDCCH transmission beam of the control link (for example, the transmission beam of the backhaul link is activated immediately after the transmission beam of the PDCCH of the control link is activated).

[0238] Alternatively, for example, the protocol stipulation is that when there is a QCL relation in the PDSCH of the backhaul link and the control link, and the PDSCH of the control link updates the TCI configuration, the backhaul link of the network-side device also updates the transmission beam of the downlink signal accordingly, and the activation time of the transmission beam of the downlink signal of the backhaul link is not earlier than the activation time of the PDSCH transmission beam of the control link (for example, the transmission beam of the backhaul link is activated immediately after the transmission beam of the PDSCH of the control link is activated).

[0239] Optionally, the method further includes the network-side device transmitting sixth configuration signaling to the relay device, where the sixth configuration signaling is used to instruct to update the TCI configuration of the downlink signal of the backhaul link.

[0240] That is, the network-side device may further instruct when the relay device updates the TCI configuration of the downlink signal of the backhaul link.

[0241] Optionally, the network-side device determines the reception configuration of the uplink signal of the backhaul link based on the candidate beam set and can be divided into Case D-1 to Case D-4 described below.

[0242] Case D-1: The protocol specification instructs that the reception beam of the uplink signal of the backhaul link is the same as the transmission beam of the downlink signal of the backhaul link.

[0243] That is, the reception beam of the uplink signal of the backhaul link of the network-side device may be the same as the transmission beam of the downlink signal.

[0244] Case D-2: The protocol specification or the beam configuration signaling instructs that the reception beam of the uplink signal of the backhaul link is determined based on the reception beam of the uplink reference signal and / or the uplink physical channel of the control link.

[0245] Here, the uplink reference signal of the control link may be SRS and / or PRACH, and the uplink physical channel of the backhaul link may be PUSCH or PUSCH. That is, the backhaul link of the network-side device can determine the reception beam of the uplink signal of the backhaul link based on the PUCCH channel or the PUSCH channel or SRS or PRACH of the control link. For example, the network-side device determines the reception beam of the uplink signal of the backhaul link based on the beam of the most recent uplink transmission (PUCCH or PUSCH or SRS or PRACH).

[0246] Hereinafter, different cases of determining the reception beam of the uplink signal of the backhaul link of the network-side device based on the PUCCH channel or the PUSCH channel or SRS or PRACH of the control link of the network-side device will be described respectively.

[0247] (1) Using the reception beam of SRS as the reception beam of the uplink signal of the backhaul link of the network-side device specifically means that in the time-frequency resource of SRS transmission, the reception beam of the uplink signal of the backhaul link of the network-side device may coincide with the reception beam of this SRS.

[0248] (2) Using the PUCCH reception beam as the reception beam of the uplink signal of the backhaul link of the network side device specifically means that in the time-frequency resource where the PUCCH is located, the reception beam of the uplink signal of the backhaul link of the network side device coincides with the reception beam of this PUCCH, and within v8 time units after the PUCCH, the reception beam of the uplink signal of the backhaul link of the network side device coincides with the reception beam of this PUCCH, where this time unit may be, for example, a slot or a symbol or a millisecond (ms).

[0249] (3) Using the PUSCH reception beam as the reception beam of the uplink signal of the backhaul link of the network side device specifically means that in the transmission time-frequency resource of the PUSCH, the reception beam of the uplink signal of the backhaul link of the network side device coincides with the reception beam of this PUSCH, and from v9 time units after the PUSCH scheduling signaling is transmitted, the reception beam of the uplink signal of the backhaul link of the network side device coincides with the reception beam of this PUSCH. Optionally, the v9 time units are greater than or equal to timeDurationForQCL, and from v10 time units after the semi-static PUSCH activation signaling is transmitted, the reception beam of the uplink signal of the backhaul link of the network side device coincides with the reception beam of this semi-static PUSCH, and from v11 time units after the feedback signaling corresponding to the semi-static PUSCH activation signaling is transmitted, the reception beam of the uplink signal of the backhaul link of the network side device coincides with the reception beam of this semi-static PUSCH, and From the first PUSCH resource of semi-static scheduling, the receiving beam of the uplink signal of the backhaul link of the network-side device coincides with the receiving beam of this semi-static PUSCH, and Within v12 time units after PUSCH transmission, the receiving beam of the uplink signal of the backhaul link of the network-side device coincides with the receiving beam of this PUSCH, where this time unit is, for example, a slot or a symbol or a millisecond (ms), and Within v13 time units after the last valid PUSCH of the semi-static PUSCH, the receiving beam of the uplink signal of the backhaul link of the network-side device coincides with the receiving beam of this semi-static PUSCH, where this time unit is, for example, a slot or a symbol or a millisecond (ms), and It may be one of the following: within v14 time units after the network-side device transmits semi-static PUSCH deactivation signaling, the receiving beam of the uplink signal of the backhaul link of the network-side device coincides with the receiving beam of this semi-static PUSCH.

[0250] Here, it should be noted that the semi-static PUSCH resource is an activated resource until the control link receives new activation signaling / configuration signaling and re-instructs information such as transmission resources / transmission beams for this semi-static PUSCH, or until the instruction information of the new activation signaling / configuration signaling starts to be activated.

[0251] Also, for a certain time period, when the receiving beam of the uplink signal of the backhaul link of the network-side device cannot be determined based on the PUCCH / PUSCH / SRS beam, by default, the receiving beam of the SSB / CSI-RS is adopted as the receiving beam of the uplink signal of the backhaul link of the network-side device, and the SSB / CSI-RS is the downlink reference signal selected by the control link having recently executed random access.

[0252] Case D-3: The protocol regulation or the beam configuration signaling instructs that the receiving beam of the uplink signal of the backhaul link is determined based on the downlink reference signal of the control link and / or the transmitting beam of the downlink physical channel.

[0253] Here, the specific cases of determining the receiving beam of the uplink signal of the backhaul link of the network-side device based on the downlink reference signal of the control link and / or the downlink physical channel are similar to the specific situations of determining the transmitting beam of the downlink signal of the backhaul link of the network-side device based on the downlink reference signal of the control link and / or the downlink physical channel, and reference can be made to the foregoing description, which will not be elaborated here.

[0254] In addition, it should be noted that for the time period when the PDCCH / PDSCH / CSI-RS beam is not activated, the receiving beam of the uplink signal of the backhaul link of the network-side device may use the beam indicated by the dedicated signaling.

[0255] Case D-4: The beam configuration signaling instructs that the beam corresponding to one of the target candidate configurations is the receiving beam of the uplink signal of the backhaul link, where the target candidate configuration includes the configuration indicated by the uplink signal configuration information configured on the control link.

[0256] That is, the uplink signal configuration information (PUCCH-SpatialRelationInfo) configured for the control link of the network-side device by dedicated signaling (e.g., the above beam configuration signaling) may be used as a candidate configuration of the reception beam of the uplink signal of the backhaul link, and it may be instructed to transmit and receive a beam corresponding to one of the configurations as the uplink signal of the backhaul link of the network-side device. For example, when DLorJoint-TCIState or UL-TCIState exists, the reception beam of the uplink signal of the backhaul link of the network-side device may be a beam corresponding to the TCI configuration in DLorJoint-TCIState or UL-TCIState. Here, when DLorJoint-TCIState and UL-TCIState do not exist, the scheme described in Cases B-1 to B-3 above may be adopted to determine the reception beam of the uplink signal of the backhaul link of the network-side device.

[0257] Also, the valid time of the reception beam of the uplink signal of the backhaul link of the network-side device may be static, adaptive, or semi-static.

[0258] For example, after the reception beam of the uplink signal of the backhaul link of the network-side device is determined, it remains valid until a new reception beam of the uplink signal of the backhaul link is configured or the reception beam of the physical channel of the control link for reference changes. Or, for example, the reception beam of the uplink signal of the backhaul link of the network-side device is valid within a certain time after being determined, and the length of the valid time is indicated by protocol regulations. Or, for example, the reception beam of the uplink signal of the backhaul link of the network-side device is always the same as the reception beam of the uplink signal most recently used by the control link of the network-side device, that is, the reception beam of the uplink signal of the backhaul link of the network-side device remains valid until the next uplink signal reception of the control link. Alternatively, for example, the protocol stipulates that when there is a QCL relationship in the PUCCH of the backhaul link and the control link of the network-side device, and the PUCCH of the control link updates the reception beam, the backhaul link of the network-side device shall also update the uplink signal reception beam accordingly, and the activation time of the uplink signal reception beam of the backhaul link shall not be earlier than the activation time of the PUCCH reception beam of the control link (for example, the uplink signal reception beam of the backhaul link is activated immediately after the reception beam of the PUCCH of the control link is activated).

[0259] Alternatively, for example, the protocol stipulates that when there is a QCL relationship in the PUSCH of the backhaul link and the control link of the network-side device, and the PUSCH of the control link updates the reception beam, the backhaul link of the network-side device shall also update the uplink signal reception beam accordingly, and the activation time of the uplink signal reception beam of the backhaul link shall not be earlier than the activation time of the PUSCH reception beam of the control link (for example, the uplink signal reception beam of the backhaul link is activated immediately after the reception beam of the PUSCH of the control link is activated).

[0260] Alternatively, for example, the protocol stipulates that when the uplink reception beam of the backhaul link of the network-side device is related to the downlink signal transmission beam of the backhaul link, and the downlink transmission beam of the backhaul link is updated, the backhaul link shall also update the uplink signal reception beam accordingly, and the activation time of the reception beam of the uplink signal of the backhaul link shall not be earlier than the activation time of the transmission beam of the downlink signal of the backhaul link.

[0261] The method for determining the transmission configuration of the backhaul link according to the embodiments of the present application may have an execution entity that is a device for determining the transmission configuration of the backhaul link. In the embodiments of the present application, taking the device for determining the transmission configuration of the backhaul link executing the method for determining the transmission configuration of the backhaul link as an example, the device for determining the transmission configuration of the backhaul link according to the embodiments of the present application will be described.

[0262] According to a third aspect, an embodiment of the present application provides a transmission configuration determination device for a backhaul link. As shown in FIG. 5, this transmission configuration determination device 50 for the backhaul link includes a candidate beam set acquisition module 501 for acquiring a candidate beam set capable of configuring a control link, and a first configuration determination module 502 for determining a transmission configuration indication (TCI) configuration of a downlink signal and / or a transmission configuration of an uplink signal of the backhaul link based on the candidate beam set.

[0263] Optionally, the candidate beam set includes at least one of a beam corresponding to candidate TCI configuration information of the control link, a beam corresponding to a downlink reference signal of the control link, a beam corresponding to a downlink physical channel of the control link, a beam corresponding to an uplink reference signal of the control link, and a beam corresponding to an uplink physical channel of the control link.

[0264] Optionally, the first configuration determination module includes a first determination sub-module for determining a TCI configuration of a downlink signal of the backhaul link based on the candidate beam set according to protocol regulations, and or a first reception sub-module for receiving first configuration signaling transmitted by a network-side device, and a second determination sub-module for determining a TCI configuration of a downlink signal of the backhaul link based on the candidate beam set according to the first configuration signaling.

[0265] Optionally, when the protocol specification or the first configuration signaling indicates that there is a QCL relationship between the downlink reference signal of the control link and / or the downlink physical channel and the backhaul link, the TCI configuration of the downlink signal of the backhaul link is determined based on the downlink reference signal of the control link and / or the downlink physical channel, or, when the first configuration signaling includes target identification information, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration indicated by the target identification information, and the target identification information indicates one TCI configuration among the candidate TCI configuration sets of the control link, or, when the first configuration signaling includes a TCI configuration, the TCI configuration of the downlink signal of the backhaul link is the TCI configuration in the first configuration signaling.

[0266] Optionally, when the protocol specification or the first configuration signaling indicates that there is a QCL relationship between the downlink reference signal of the control link and the backhaul link, the reference signal included in the TCI configuration of the downlink signal of the backhaul link is the downlink reference signal of the control link, and the QCL type is determined based on the protocol specification or based on the configuration of the network side device, or, when the protocol specification or the first configuration signaling indicates that there is a QCL relationship between the downlink physical channel of the control link and the backhaul link, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the downlink physical channel of the control link.

[0267] Optionally, the fact that the above are partially the same means that the reference signals included in the TCI configuration are the same, and the QCL type is indicated by the protocol specification or by a configuration message.

[0268] Optionally, the TCI configuration indicated by the target identification information is one of the M candidate TCI configurations indicated in the upper layer configuration information or one of the N TCI configurations indicated in the TCI activation command of the control link, where M and N are both integers greater than 0, where the N TCI configurations are part of the M TCI configurations.

[0269] Optionally, the TCI configuration of the downlink signal of the backhaul link is determined based on the downlink reference signal of the control link and the one with the highest priority or the one closest to the current time in the downlink physical channel.

[0270] Optionally, when the relay device determines the TCI configuration of the downlink signal of the backhaul link based on the first configuration signaling and based on the candidate beam set, the TCI configuration of the downlink signal of the backhaul link becomes effective from the time indicated by k + X, where k indicates the slot or the last symbol where the first configuration signaling is located, or the slot or the last symbol where the hybrid automatic repeat request - acknowledgement feedback message corresponding to the first configuration signaling is located, and X is determined by the protocol specification or based on the capabilities of the relay device.

[0271] Optionally, the device further includes a first processing module, and when there is an overlap in the transmission of the backhaul link and the control link within the target time, Use the target TCI configuration to receive the downlink signal of the backhaul link or use the target uplink transmission configuration to transfer the uplink signal of the backhaul link, and It is used to execute one of not transferring the downlink signal or the uplink signal of the backhaul link within the target time, Here, the target TCI configuration is one of the TCI configurations used by the control link within the target time, and the target uplink transmission configuration is the uplink transmission configuration used by the control link within the target time, The target time includes at least one of the time unit of the transmission of the control link of the relay device, a time units before the transmission of the control link, and b time units after the transmission of the control link. a and b each represent an integer greater than zero, and the time unit is one of an orthogonal frequency division multiplexing symbol, a slot, a subframe, and a radio frame.

[0272] Optionally, the device Further includes a first update module. The first update module is used to update and activate the new TCI configuration of the downlink signal of the backhaul link when the TCI configuration of the control link is updated, or when the relay device receives the new TCI configuration of the downlink signal of the backhaul link transmitted by the network side device, or when the relay device receives the sixth configuration signaling transmitted by the network side device. Here, the sixth configuration signaling is used to instruct to update the TCI configuration of the downlink signal of the backhaul link.

[0273] Optionally, the device Further includes a second processing module. The second processing module, after the first update module updates and activates the new TCI configuration of the downlink signal of the backhaul link, To directly maintain the amplification factor of the downlink signal of the backhaul link; Based on the first amplification factor, adjusting the amplification factor of the downlink signal of the backhaul link, where the first amplification factor is carried in the third configuration signaling transmitted by the network-side device; Based on the difference between the first channel measurement result and the second channel measurement result, adjusting the amplification factor of the downlink signal of the backhaul link; Here, the first channel measurement result and the second channel measurement result are further included, and one of them is the channel measurement result before and after the new TCI configuration of the downlink signal of the backhaul link is updated and activated.

[0274] Optionally, the transmission configuration of the uplink signal of the backhaul link indicates the transmission spatial region filter of the uplink signal of the backhaul link; The spatial receiver parameters of the downlink signal of the backhaul link; The transmission spatial region filter of one uplink signal of the control link; Is related to one of the reception spatial region filters of one downlink signal of the control link.

[0275] Optionally, the first configuration determination module A third determination sub-module for determining the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set according to protocol regulations; Or, A second reception sub-module for receiving the fourth configuration signaling transmitted by the network-side device; A fourth determination sub-module for determining the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set according to the fourth configuration signaling; Or, A fifth determination sub-module for determining the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set. Including a sixth determination sub-module for determining the transmission configuration of the uplink signal of the backhaul link based on the TCI configuration of the downlink signal of the backhaul link according to the protocol regulations.

[0276] Optionally, the protocol regulations instruct that the transmission spatial region filter of the uplink signal of the backhaul link is related to the spatial receiver parameters of the downlink signal of the backhaul link. Or The protocol regulations or the fourth configuration signaling instruct that the transmission configuration of the uplink signal of the backhaul link is determined based on the uplink reference signal and / or the configuration of the uplink physical channel of the control link. Or The protocol regulations or the fourth configuration signaling instruct that the transmission configuration of the uplink signal of the backhaul link is determined based on the downlink reference signal and / or the downlink physical channel of the control link. Or The fourth configuration signaling instructs that one of the target candidate configurations is the transmission configuration of the uplink signal of the backhaul link, where the target candidate configuration includes the configuration indicated by the uplink signal configuration information configured on the control link.

[0277] Optionally, the device Further includes a third processing module. After the uplink transmission configuration of the backhaul link is updated, Keep the amplification factor of the uplink signal of the backhaul link unchanged. Adjusting the amplification factor of the uplink signal of the backhaul link based on a second amplification factor, where the second amplification factor is carried in a fifth configuration signaling transmitted by a network-side device. Used to execute one of adjusting the amplification factor of the uplink signal of the backhaul link based on the difference between a third channel measurement result and a fourth channel measurement result. Here, the third channel measurement result and the fourth channel measurement result are channel measurement results before and after the update of the transmission configuration of the uplink signal of the backhaul link, respectively.

[0278] The transmission configuration determination device of the backhaul link in the embodiments of the present application may be a relay device, for example, a relay device having an operating system, or a member in the relay device, for example, an integrated circuit or a chip.

[0279] The transmission configuration determination device of the backhaul link according to the embodiments of the present application realizes each process realized by the embodiments of the 3 methods and can achieve the same technical effects. To avoid repetition of the description, it will not be described further here.

[0280] According to a fourth aspect, the embodiments of the present application provide a transmission configuration determination device for a backhaul link. As shown in FIG. 6, this transmission configuration determination device 60 of the backhaul link includes: A candidate beam set determination module 601 for determining a configurable candidate beam set of a control link; A first transmission module 602, which is used to transmit beam configuration signaling of the backhaul link to a relay device. Here, the beam configuration signaling is for the relay device to determine the transmission configuration indication (TCI) configuration of the downlink signal of the backhaul link and / or the transmission configuration of the uplink signal based on the configurable candidate beam set of the control link. A second configuration determination module 603 for determining a transmission beam of the downlink signal and / or a reception beam of the uplink signal of the backhaul link based on the candidate beam set according to the beam configuration signaling or protocol specification is included.

[0281] Optionally, the candidate beam set includes at least one of a beam corresponding to candidate TCI configuration information of the control link, a beam corresponding to a downlink reference signal of the control link, a beam corresponding to a downlink physical channel of the control link, a beam corresponding to an uplink reference signal of the control link, and a beam corresponding to an uplink physical channel of the control link.

[0282] Optionally, when the protocol specification or the beam configuration signaling indicates that the downlink reference signal and / or the downlink physical channel of the control link has a QCL relationship with the backhaul link, the transmission beam of the downlink signal of the backhaul link is determined based on the downlink reference signal and / or the downlink physical channel of the control link. Or when the beam configuration signaling includes target identification information, the transmission beam of the downlink signal of the backhaul link is the same as the beam corresponding to the TCI configuration indicated by the target identification information, and the target identification information indicates one TCI configuration of the candidate TCI configuration set of the control link. Or when the beam configuration signaling includes a TCI configuration, the transmission beam of the downlink signal of the backhaul link is the beam corresponding to the TCI configuration in the beam configuration signaling.

[0283] Optionally, when the protocol specification or the beam configuration signaling indicates that there is a QCL relationship between the downlink reference signal of the control link and the backhaul link, the transmission beam of the downlink signal of the backhaul link is the same as the transmission beam of the downlink reference signal of the control link. Or, when the protocol specification or the beam configuration signaling indicates that there is a QCL relationship between the downlink physical channel of the control link and the backhaul link, the transmission beam of the downlink signal of the backhaul link is the same as the transmission beam of the downlink physical channel of the control link.

[0284] Optionally, the TCI configuration indicated by the target identification information is one of the M candidate TCI configurations indicated in the upper layer configuration information, or one of the N TCI configurations indicated in the TCI activation command of the control link, where M and N are both integers greater than 0. Here, the N TCI configurations are part of the M TCI configurations.

[0285] Optionally, the transmission beam of the downlink signal of the backhaul link is determined based on the transmission beam with the highest priority or the closest to the current time in the downlink reference signal and the downlink physical channel of the control link.

[0286] Optionally, the apparatus further includes a second transmission module, which is used to transmit sixth configuration signaling to the relay device, where the sixth configuration signaling is used to indicate to update the TCI configuration of the downlink signal of the backhaul link.

[0287] Optionally, the protocol specification indicates that the reception beam of the uplink signal of the backhaul link is the same as the transmission beam of the downlink signal of the backhaul link. Or, the protocol regulation or the beam configuration signaling instructs that the reception beam of the uplink signal of the backhaul link is determined based on the reception beam of the uplink reference signal and / or the uplink physical channel of the control link, Or, the protocol regulation or the beam configuration signaling instructs that the reception beam of the uplink signal of the backhaul link is determined based on the transmission beam of the downlink reference signal and / or the downlink physical channel of the control link, Or, the beam configuration signaling instructs that the beam corresponding to one of the target candidate configurations is the reception beam of the uplink signal of the backhaul link, where the target candidate configuration includes the configuration indicated by the uplink signal configuration information configured on the control link.

[0288] The transmission configuration determination device for the backhaul link in the embodiments of the present application may be an electronic device, for example, an electronic device having an operating system, or a member in the electronic device, for example, an integrated circuit or a chip. This electronic device may be a network-side device. Exemplarily, the terminal may include the types of the network-side devices 12 listed above, but is not limited thereto, and other devices may be a server, a Network Attached Storage (NAS), etc., and the embodiments of the present application do not specifically limit.

[0289] The transmission configuration determination device for the backhaul link according to the embodiments of the present application realizes each process realized by the embodiments of the 4 methods and can achieve the same technical effects. To avoid repeated description, it will not be described further here.

[0290] Optionally, as shown in FIG. 7, an embodiment of the present application further provides a communication device 700, which includes a processor 701 and a memory 702. A program or instruction executable on the processor 701 is stored in the memory 702. For example, when the communication device 700 is a relay device, when this program or instruction is executed by the processor 701, each step of the embodiment of the method for determining the transmission configuration of the backhaul link described in the first aspect is realized, and the same technical effect can be achieved. When the communication device 700 is a network-side device, when this program or instruction is executed by the processor 701, each step of the embodiment of the method for determining the transmission configuration of the backhaul link described in the second aspect is realized, and the same technical effect can be achieved. To avoid repetition of the description, it will not be described further herein.

[0291] An embodiment of the present application further provides a network-side device, which includes a processor and a communication interface. The communication interface is used to send beam configuration signaling of the backhaul link to a relay device. Here, the beam configuration signaling is used to instruct the relay device to determine the transmission configuration indication (TCI) configuration of the downlink signal and the transmission configuration of the uplink signal of the backhaul link based on a candidate beam set that the control link can configure. The processor is used to determine the transmission beam of the downlink signal of the backhaul link based on the beam configuration signaling.

[0292] This embodiment of the network-side device corresponds to the embodiment of the above network-side device method. Each implementation process and implementation method of the embodiment of the above method can be applied to this embodiment of the network-side device, and the same technical effect can be achieved.

[0293] Specifically, the embodiments of the present application further provide a network-side device. As shown in FIG. 8, this network-side device 800 includes an antenna 81, a radio frequency device 82, a baseband device 83, a processor 84, and a memory 85. The antenna 81 is connected to the radio frequency device 82. In the uplink direction, the radio frequency device 82 receives information via the antenna 81 and transmits the received information to the baseband device 83 for processing. In the downlink direction, the baseband device 83 processes the information to be transmitted and transmits it to the radio frequency device 82, and the radio frequency device 82 processes the received information and then sends it out via the antenna 81.

[0294] In the above embodiments, the method executed by the network-side device may be implemented in the baseband device 83, and this baseband device 83 includes a baseband processor.

[0295] The baseband device 83 may include, for example, at least one baseband board, and a plurality of chips are installed on this baseband board. As shown in FIG. 8, one of the chips is, for example, a baseband processor, which is connected to the memory 85 via a bus interface, calls the program in the memory 85, and executes the network-side device operations shown in the embodiments of the above method.

[0296] This network-side device may further include a network interface 86, and this interface is, for example, a common public radio interface (CPRI).

[0297] Specifically, the network-side device 800 of the embodiments of the present invention further includes instructions or programs stored in the memory 85 and executable on the processor 84. The processor 84 calls the instructions or programs in the memory 85, executes the method executed by each module shown in FIG. 4, and can achieve the same technical effects. To avoid repetition of the description, it will not be described further here.

[0298] Embodiments of this application further provide a readable storage medium, on which a program or instructions are stored. When the program or instructions are executed by a processor, each process of the embodiment of the method for determining the transmission configuration of the backhaul link is realized, and the same technical effect can be achieved. To avoid repetition of the description, it will not be described further here.

[0299] Here, 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, etc.

[0300] Embodiments of this application further provide a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run a program or instructions to realize each process of the embodiment of the method for determining the transmission configuration of the backhaul link, and the same technical effect can be achieved. To avoid repetition of the description, it will not be described further here.

[0301] It should be understood that the chip mentioned in the embodiments of this application may also be called a system-level chip, a system chip, a chip system, or a system-on-chip, etc.

[0302] Embodiments of this application further provide 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 realize each process of the embodiment of the method for determining the transmission configuration of the backhaul link, and the same technical effect can be achieved. To avoid repetition of the description, it will not be described further here.

[0303] Embodiments of the present application further provide a transmission configuration determination system for a backhaul link, including a relay device and a network-side device. The terminal may be used to execute the steps of the method for determining the transmission configuration of the backhaul link described in the first aspect above, and the network-side device may be used to execute the steps of the method for determining the transmission configuration of the backhaul link described in the second aspect above.

[0304] It should be noted that in this specification, the term "including", "being included", or any other variation thereof is intended to cover non-exclusive "including", whereby a process, method, article, or device including a series of elements includes not only those elements but also other elements not explicitly listed, or elements specific to such a process, method, article, or device. When there is no further limitation, for an element limited by the phrase "including one...", it is not excluded that there are other same elements in the process, method, article, or device including this element. It should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to executing functions in the order shown or discussed, and may include executing functions in a basically simultaneous manner or in the reverse order based on the relevant functions. For example, a method described in a different procedure from that described may be executed, and additions, omissions, or combinations may be made for various steps. Also, features described with reference to some examples can be combined in other examples.

[0305] As can be clearly understood by those skilled in the art from the description of the above embodiments, the method of the above embodiments can be realized by means of software and the necessary general-purpose hardware platform. Of course, it may also be realized by hardware, but in many cases, the former is a more preferred embodiment. From such an understanding, the substantial part or the part contributing to the prior art of the technical solution of this application is embodied in the form of a computer software product. This computer software product is stored in a storage medium (for example, ROM / RAM, magnetic disk, optical disk), and may include some instructions so as to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network-side device, etc.) to execute the method of each embodiment of this application.

[0306] The above has described the embodiments of this application in conjunction with the drawings, but this application is not limited to the above specific embodiments. The above specific embodiments are merely exemplary and not restrictive. Those skilled in the art can make many forms without departing from the spirit of this application and the scope protected by the claims, and all belong to the protection scope of this application.

Claims

1. A method for determining a transmission configuration of a backhaul link, where the method includes: The relay device obtains a set of candidate beams that can be configured for the control link; The relay device determines a transmission configuration indication (TCI) configuration of the downlink signal of the backhaul link and / or a transmission configuration of the uplink signal based on the set of candidate beams. A method for determining a transmission configuration of a backhaul link.

2. The set of candidate beams includes: A beam corresponding to candidate TCI configuration information of the control link; A beam corresponding to the downlink reference signal of the control link; A beam corresponding to the downlink physical channel of the control link; A beam corresponding to the uplink reference signal of the control link; The method according to claim 1, including at least one of a beam corresponding to the uplink physical channel of the control link.

3. When the relay device determines the TCI configuration of the downlink signal of the backhaul link based on the set of candidate beams: The relay device determines the TCI configuration of the downlink signal of the backhaul link based on the set of candidate beams according to protocol regulations; Or The relay device receives first configuration signaling transmitted by a network-side device; The relay device determines the TCI configuration of the downlink signal of the backhaul link based on the set of candidate beams according to the first configuration signaling. The method according to claim 2.

4. When the protocol regulations or the first configuration signaling indicate that the downlink reference signal and / or the downlink physical channel of the control link have a QCL relationship with the backhaul link, the TCI configuration of the downlink signal of the backhaul link is determined based on the downlink reference signal and / or the downlink physical channel of the control link; Or When the first configuration signaling includes target identification information, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration indicated by the target identification information, and the target identification information indicates one TCI configuration in the set of candidate TCI configurations of the control link; Or The method according to claim 3, wherein when the first configuration signaling includes a TCI configuration, the TCI configuration of the downlink signal of the backhaul link is the TCI configuration in the first configuration signaling.

5. When the protocol regulation or the first configuration signaling indicates that there is a QCL relationship between the downlink reference signal of the control link and the backhaul link, the reference signal included in the TCI configuration of the downlink signal of the backhaul link is the downlink reference signal of the control link, and the QCL type is determined based on the protocol regulation or determined based on the configuration of the network-side device. Or, The method according to claim 4, wherein when the protocol regulation or the first configuration signaling indicates that there is a QCL relationship between the downlink physical channel of the control link and the backhaul link, the TCI configuration of the downlink signal of the backhaul link is the same as or partially the same as the TCI configuration of the downlink physical channel of the control link.

6. The "partially the same" in the above means that the reference signals included in the TCI configuration are the same, and the QCL type is indicated by the protocol regulation or indicated by a configuration message. The method according to claim 5.

7. The TCI configuration indicated by the target identification information is one of the M candidate TCI configurations indicated in the upper layer configuration information, or one of the N TCI configurations indicated in the TCI activation command of the control link, where M and N are both integers greater than 0. Here, the N TCI configurations are a part of the M TCI configurations. The method according to claim 4.

8. The TCI configuration of the downlink signal of the backhaul link is determined based on the one with the highest priority or the one closest to the current time in the downlink reference signal and the downlink physical channel of the control link. The method according to claim 3.

9. When the relay device determines the TCI configuration of the downlink signal of the backhaul link based on the first configuration signaling and based on the candidate beam set, the TCI configuration of the downlink signal of the backhaul link becomes effective from the time indicated by k + X. Here, k indicates the slot or the last symbol where the first configured signaling is located, or the slot or the last symbol where the hybrid automatic repeat request - acknowledgment feedback message corresponding to the first configured signaling is located, and X is the method according to claim 3, which is determined according to the protocol regulations or based on the capabilities of the relay device.

10. The method is When there is an overlap in the transmission of the backhaul link and the control link within the target time, the relay device The relay device performs downlink signal reception of the backhaul link using the target TCI configuration or performs uplink signal transfer of the backhaul link using the target uplink transmission configuration, The relay device further includes performing one of not performing downlink signal transfer of the backhaul link or not performing uplink signal transfer of the backhaul link within the target time, Here, the target TCI configuration is one of the TCI configurations used by the control link within the target time, and the target uplink transmission configuration is the uplink transmission configuration used by the control link within the target time, The target time includes at least one of the time unit of the transmission of the control link, a time units before the transmission of the control link, and b time units after the transmission of the control link, where a and b each represent an integer greater than zero, and the time unit is one of an orthogonal frequency division multiplexing symbol, a slot, a subframe, and a radio frame. The method according to claim 1.

11. The method is When the TCI configuration of the control link is updated, or when the relay device receives a new TCI configuration of the downlink signal of the backhaul link transmitted by the network-side device, or when the relay device receives the sixth configured signaling transmitted by the network-side device, the relay device further includes updating and activating the new TCI configuration of the downlink signal of the backhaul link, Here, the sixth configured signaling is used to indicate to update the TCI configuration of the downlink signal of the backhaul link. The method according to claim 1.

12. After the relay device updates and activates a new TCI configuration of the downlink signal of the backhaul link, the method includes: The relay device maintaining the amplification factor of the downlink signal of the backhaul link as it is; adjusting the amplification factor of the downlink signal of the backhaul link based on a first amplification factor, where the first amplification factor is carried in a third configuration signaling transmitted by the network-side device; adjusting the amplification factor of the downlink signal of the backhaul link based on the difference between a first channel measurement result and a second channel measurement result; wherein the first channel measurement result and the second channel measurement result are each one of the channel measurement results before and after a new TCI configuration of the downlink signal of the backhaul link is updated and activated, further including the method according to claim 11. **Claim 13** The transmission configuration of the uplink signal of the backhaul link indicates a transmission spatial region filter of the uplink signal of the backhaul link, the spatial receiver parameters of the downlink signal of the backhaul link, a transmission spatial region filter of an uplink signal of one of the control links, The method according to claim 1, related to one of the reception spatial region filters of a downlink signal of one of the control links. **Claim 14** When the relay device determines the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set, the relay device directly determines the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set according to protocol regulations; or the relay device receives fourth configuration signaling transmitted by the network-side device, the relay device determines the transmission configuration of the uplink signal of the backhaul link based on the candidate beam set according to the fourth configuration signaling; or the relay device determines the TCI configuration of the downlink signal of the backhaul link based on the candidate beam set, the relay device determines the transmission configuration of the uplink signal of the backhaul link based on the TCI configuration of the downlink signal of the backhaul link according to the protocol regulations, including the method according to claim 2.

15. The protocol specification instructs that the transmission spatial region filter of the uplink signal of the backhaul link is related to the spatial receiver parameters of the downlink signal of the backhaul link, or the protocol specification or the fourth configuration signaling instructs that the transmission configuration of the uplink signal of the backhaul link is determined based on the uplink reference signal and / or the configuration of the uplink physical channel of the control link, or the protocol specification or the fourth configuration signaling instructs that the transmission configuration of the uplink signal of the backhaul link is determined based on the downlink reference signal and / or the downlink physical channel of the control link, or the fourth configuration signaling instructs that one of the target candidate configurations is the transmission configuration of the uplink signal of the backhaul link, where the target candidate configuration includes the configuration indicated by the uplink signal configuration information configured on the control link. The method according to claim 14.

16. After the uplink transmission configuration of the backhaul link is updated, the method includes: the relay device keeping the amplification factor of the uplink signal of the backhaul link unchanged, adjusting the amplification factor of the uplink signal of the backhaul link based on a second amplification factor, where the second amplification factor is carried in a fifth configuration signaling transmitted by a network-side device, adjusting the amplification factor of the uplink signal of the backhaul link based on the difference between a third channel measurement result and a fourth channel measurement result, where the third channel measurement result and the fourth channel measurement result are respectively one of the channel measurement results before and after the update of the transmission configuration of the uplink signal of the backhaul link. The method according to claim 1.

17. A method for determining the transmission configuration of a backhaul link, where the method includes: a network-side device determining a configurable candidate beam set of a control link, The network-side device transmits beam configuration signaling for a backhaul link to a relay device, where the beam configuration signaling is used to instruct the relay device to determine a transmission configuration indication (TCI) configuration of a downlink signal and / or a transmission configuration of an uplink signal of the backhaul link based on a set of candidate beams that can configure a control link. A method for determining a transmission configuration of a backhaul link, including: the network-side device determining a transmission beam of a downlink signal and / or a reception beam of an uplink signal of the backhaul link based on the set of candidate beams according to the beam configuration signaling or protocol specifications. **Claim 18** The set of candidate beams includes a beam corresponding to candidate TCI configuration information of the control link, a beam corresponding to a downlink reference signal of the control link, a beam corresponding to a downlink physical channel of the control link, a beam corresponding to an uplink reference signal of the control link, and at least one of a beam corresponding to an uplink physical channel of the control link, according to the method of Claim 17. **Claim 19** When the protocol specification or the beam configuration signaling indicates that there is a QCL relationship between the downlink reference signal and / or the downlink physical channel of the control link and the backhaul link, the transmission beam of the downlink signal of the backhaul link is determined based on the downlink reference signal and / or the downlink physical channel of the control link. Or when the beam configuration signaling includes target identification information, the transmission beam of the downlink signal of the backhaul link is the same as the beam corresponding to the TCI configuration indicated by the target identification information, and the target identification information indicates one TCI configuration from among a set of candidate TCI configurations of the control link. Or when the beam configuration signaling includes a TCI configuration, the transmission beam of the downlink signal of the backhaul link is the beam corresponding to the TCI configuration in the beam configuration signaling, according to the method of Claim 18. **Claim 20** When the protocol specification or the beam configuration signaling indicates that there is a QCL relationship between the downlink reference signal of the control link and the backhaul link, the transmission beam of the downlink signal of the backhaul link is the same as the transmission beam of the downlink reference signal of the control link. Or When the protocol specification or the beam configuration signaling indicates that there is a QCL relationship between the downlink physical channel of the control link and the backhaul link, the transmission beam of the downlink signal of the backhaul link is the same as the transmission beam of the downlink physical channel of the control link. The method according to claim 19. **Claim 21** The TCI configuration indicated by the target identification information is one of the M candidate TCI configurations indicated in the upper layer configuration information or one of the N TCI configurations indicated in the TCI activation command of the control link, where M and N are both integers greater than 0. Here, the N TCI configurations are part of the M TCI configurations. The method according to claim 19. **Claim 22** The transmission beam of the downlink signal of the backhaul link is determined based on the transmission beam with the highest priority or the one closest to the current time in the downlink reference signal and the downlink physical channel of the control link. The method according to claim 18. **Claim 23** The method further includes the network-side device transmitting sixth configuration signaling to the relay device, where the sixth configuration signaling is used to indicate to update the TCI configuration of the downlink signal of the backhaul link. The method according to claim 17. **Claim 24** The protocol specification indicates that the reception beam of the uplink signal of the backhaul link is the same as the transmission beam of the downlink signal of the backhaul link. Or The protocol specification or the beam configuration signaling indicates that the reception beam of the uplink signal of the backhaul link is determined based on the reception beam of the uplink reference signal and / or the uplink physical channel of the control link. Or The protocol regulation or the beam configuration signaling indicates that the reception beam of the uplink signal of the backhaul link is determined based on the downlink reference signal and / or the transmission beam of the downlink physical channel of the control link. Or The beam configuration signaling indicates that the beam corresponding to one of the target candidate configurations is the reception beam of the uplink signal of the backhaul link, where the target candidate configuration includes the configuration indicated by the uplink signal configuration information configured on the control link. The method according to claim 18.

25. A transmission configuration determination device for a backhaul link, where the device includes a candidate beam set acquisition module for acquiring a set of candidate beams that can be configured for the control link, and a first configuration determination module for determining a transmission configuration indication TCI configuration of the downlink signal and / or a transmission configuration of the uplink signal of the backhaul link based on the set of candidate beams. A transmission configuration determination device for a backhaul link.

26. A transmission configuration determination device for a backhaul link, where the device includes a candidate beam set determination module for determining a set of candidate beams that can be configured for the control link, a first transmission module used to transmit beam configuration signaling of the backhaul link to a relay device, where the beam configuration signaling is for instructing the relay device to determine a transmission configuration indication TCI configuration of the downlink signal and / or a transmission configuration of the uplink signal of the backhaul link based on the set of candidate beams that can be configured for the control link, and a second configuration determination module for determining a transmission beam of the downlink signal and / or a reception beam of the uplink signal of the backhaul link based on the set of candidate beams based on the beam configuration signaling or protocol regulation. A transmission configuration determination device for a backhaul link.

27. A relay device including 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, it realizes the steps of the transmission configuration determination method for the backhaul link according to any one of claims 1 to 16.

28. A network-side device comprising a processor and a memory, wherein the memory stores a program or instructions that can run on the processor, and when the program or instructions are executed by the processor, the steps of the method for determining a transmission configuration of a backhaul link according to any one of claims 17 to 24 are realized.

29. A readable storage medium storing a program or instructions, and when the program or instructions are executed by a processor, realizing the method for determining a transmission configuration of a backhaul link according to any one of claims 1 to 16, or realizing the steps of the method for determining a transmission configuration of a backhaul link according to any one of claims 17 to 24.

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