WO2022246762A1 - 中继确定方法、装置、远端设备及存储介质 - Google Patents

中继确定方法、装置、远端设备及存储介质 Download PDF

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Publication number
WO2022246762A1
WO2022246762A1 PCT/CN2021/096512 CN2021096512W WO2022246762A1 WO 2022246762 A1 WO2022246762 A1 WO 2022246762A1 CN 2021096512 W CN2021096512 W CN 2021096512W WO 2022246762 A1 WO2022246762 A1 WO 2022246762A1
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WIPO (PCT)
Prior art keywords
candidate relay
relay device
ntn
candidate
network access
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PCT/CN2021/096512
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English (en)
French (fr)
Inventor
于新磊
李海涛
冷冰雪
陈景然
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to EP21942338.1A priority Critical patent/EP4351270A1/en
Priority to CN202180098020.5A priority patent/CN117296446A/zh
Priority to PCT/CN2021/096512 priority patent/WO2022246762A1/zh
Publication of WO2022246762A1 publication Critical patent/WO2022246762A1/zh
Priority to US18/519,300 priority patent/US20240088993A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present application relates to the communication field, and in particular to a relay determination method, device, remote device and storage medium.
  • Non-Terrestrial Network NTN
  • satellite communication is used to provide communication services to user equipment (User Equipment, UE).
  • User Equipment User Equipment
  • Some remote devices can select a relay device through relay selection, so as to access the network through the relay device. If the access performance of the currently connected relay device is not good, the remote device can also select another relay device to access the network through relay reselection.
  • the remote device performs relay selection or relay reselection based on Reference Signal Received Power (RSRP).
  • RSRP Reference Signal Received Power
  • the distance between the UE and the satellite and between the satellite and the ground station is too large, resulting in a delay in the communication between the UE and the data network. Relatively large, so some delay-sensitive services are not suitable for use in the NTN network. Therefore, when the relay device establishes a connection with the ground base station through the satellite, it is not the optimal choice for the remote device to access the relay device, which may cause a large data service delay of the remote device and provide poor communication service quality.
  • Embodiments of the present application provide a relay determination method, device, remote device, and storage medium. Described technical scheme is as follows:
  • a relay determination method comprising:
  • the network access mode includes NTN access or terrestrial access.
  • a device for relay determination comprising:
  • a processing module configured to perform relay selection or relay reselection according to the network access mode of the candidate relay device
  • the network access mode includes NTN access or terrestrial access.
  • a remote device includes:
  • processors one or more processors
  • one or more transceivers coupled to the one or more processors
  • the one or more processors are configured to load and execute executable instructions to implement the above relay determination method.
  • a computer-readable storage medium is provided, at least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by one or more processors to implement the above-mentioned Continue to determine the method.
  • a computer program product or computer program includes one or more instructions, and the one or more instructions are stored in a computer-readable in the storage medium.
  • One or more processors of the remote device read the one or more instructions from the computer-readable storage medium, and the one or more processors execute the one or more instructions, so that the remote device Execute the above relay determination method.
  • the delay between the candidate relay device and the data network is different, and the remote device learns the network access method of the candidate relay device, and uses this as the relay selection or
  • the basis for relay reselection is to select a candidate relay device with a relatively small transmission delay and access to a better cell, which improves the communication service quality of the cell accessed by the remote device and prevents the remote device from being in the unknown.
  • the candidate relay device connected to the ground base station through the satellite is selected, and the communication service quality of the accessed cell is poor, which cannot meet some service requirements of the remote device.
  • FIG. 1 is a schematic diagram of a satellite network architecture for transparent transmission and forwarding shown according to an exemplary embodiment of the present application
  • FIG. 2 is a schematic diagram of a regenerative and forwarding satellite network architecture according to an exemplary embodiment of the present application
  • FIG. 3 is a schematic diagram of a satellite network architecture for transparent transmission and forwarding in a 5G (5th Generation Mobile Communication Technology, fifth generation mobile communication technology) scenario shown according to an exemplary embodiment of the present application;
  • FIG. 4 is a schematic diagram of a satellite network architecture for regenerative forwarding in a 5G scenario according to an exemplary embodiment of the present application
  • FIG. 5 is a flow chart of establishing a connection between a remote UE and a relay UE according to an exemplary embodiment of the present application
  • FIG. 6 is a schematic diagram of a satellite network architecture for transparent transmission and forwarding shown according to another exemplary embodiment of the present application.
  • FIG. 7 is a schematic diagram of a regenerative and forwarding satellite network architecture according to another exemplary embodiment of the present application.
  • FIG. 8 is a schematic diagram of a satellite network architecture for transparent transmission and forwarding in a 5G scenario according to another exemplary embodiment of the present application.
  • FIG. 9 is a schematic diagram of a satellite network architecture for regenerative forwarding in a 5G scenario according to another exemplary embodiment of the present application.
  • FIG. 10 is a schematic diagram of a UE-to-Network Relay (side relay) coverage scenario shown according to an exemplary embodiment of the present application;
  • Fig. 11 is a flowchart of a method for determining a relay according to an exemplary embodiment of the present application.
  • Fig. 12 is a schematic diagram of a protocol stack of a discovery message according to an exemplary embodiment of the present application.
  • Fig. 13 is a flowchart showing a process of determining a network access mode of a candidate relay device according to an exemplary embodiment of the present application
  • Fig. 14 is a flowchart of a relay selection method according to an exemplary embodiment of the present application.
  • FIG. 15 is a flowchart of a relay selection method according to another exemplary embodiment of the present application.
  • FIG. 16 is a flowchart of a relay reselection method according to an exemplary embodiment of the present application.
  • Fig. 17 is a block diagram of a relay determining device according to an exemplary embodiment of the present application.
  • Fig. 18 is a schematic structural diagram of a remote device according to an exemplary embodiment of the present application.
  • Satellite communication is generally used to provide communication services to ground UEs.
  • satellite communication has many unique advantages.
  • satellite communication is not limited by the user's region; for example, general land communication cannot cover areas where communication equipment cannot be set up, such as oceans, mountains, and deserts, or areas where communication coverage is not possible due to sparse population.
  • general land communication cannot cover areas where communication equipment cannot be set up, such as oceans, mountains, and deserts, or areas where communication coverage is not possible due to sparse population.
  • satellite communication Since a satellite can cover a large area, and the satellite can orbit the earth, theoretically every corner of the earth can be covered by satellite communication.
  • satellite communication has great social value.
  • Satellite communication can cover remote mountainous areas, poor and backward countries or regions at a lower cost, so that people in these regions can enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital gap with developed regions , to promote the development of these areas.
  • the satellite communication distance is long, and the communication cost does not increase significantly when the communication distance increases.
  • satellite communication has high stability and is not limited by natural disasters.
  • LEO Low-Earth Orbit
  • MEO Medium-Earth Orbit
  • GEO High Elliptical Orbit
  • HEO High Elliptical Orbit
  • the altitude range of low-orbit satellites is 500 kilometers (km) to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours.
  • the signal propagation delay of single-hop communication between UEs is generally less than 20 milliseconds (ms).
  • the maximum satellite visible time is 20 minutes.
  • the signal propagation distance is short, the link loss is small, and the requirements for the transmit power of the UE are not high.
  • Satellites in geosynchronous orbit have an orbital altitude of 35786km and a period of 24 hours around the earth.
  • the signal propagation delay of single-hop communication between UEs is generally 250ms.
  • communication satellites use multi-beams to cover the ground.
  • a communication satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover tens of beams in diameter. hundred kilometers of ground area.
  • the transparent forwarding satellite network architecture can be shown in Figure 1.
  • the satellite network architecture for regenerative forwarding can be shown in Figure 2.
  • the satellite network architecture may include network elements such as satellites and network equipment, where the network equipment is used to connect the satellite and the data network on the ground.
  • the number of network devices is one or more.
  • the network device may be called an NTN gateway device (Gateway).
  • the UE can connect to the 5GCN (5G Core Network, 5G Radio Access Network) via NTN's NG-RAN (NG-Radio Access Network, 5G Radio Access Network) based on transparent forwarding or regenerative forwarding. Core Network).
  • the satellite network architecture of the 5G scenario can be shown in Figure 3 and Figure 4.
  • Figure 3 shows the satellite network architecture of transparent forwarding in the 5G scenario
  • Figure 4 shows the satellite network architecture of regenerative forwarding in the 5G scenario.
  • the satellite can be divided into two types: transparent transmission load and regenerative load in terms of the functions it provides.
  • the transparent transmission load only provides the functions of radio frequency filtering, frequency conversion and amplification. It only provides transparent forwarding of signals and will not change its forwarded waveform signal.
  • the regenerative load can also provide demodulation/decoding, routing/conversion, encoding/modulation functions.
  • the regenerative load has some or all functions of the base station.
  • the satellite network architecture also includes UE, which can establish a connection with the satellite and access the data network through the satellite. The UE can realize data interaction with the data network through the data forwarding function of the satellite.
  • the communication link between the network equipment and the satellite is a feeder link (Feeder Link)
  • the communication link between the UE and the satellite is a service link (Service Link).
  • the remote device can refer to the device outside the coverage of the network, or it can refer to the device in the edge area of the network coverage.
  • the remote device may not be connected to the base station, or the signal quality of the communication link after connecting to the base station may be poor. Difference.
  • a remote device (Remote UE) may also be referred to as a remote UE or a remote terminal. The following are called Remote UE.
  • the relay device is an instrument device that is added in the middle when homogeneous network segments with the same interface and the same media access control protocol are interconnected.
  • the relay device can amplify the transmitted signal and retransmit it.
  • the relay device has a relay function, and the relay means that the base station and the UE do not directly send signals to each other, but forward them through the relay device through signal amplification or regeneration processing.
  • a relay device may also be called a relay UE or a relay terminal. The following are all referred to as Relay UE.
  • 3GPP introduced the UE-to-network (device to network) relay function based on layer 3 relay, that is, the remote UE passes The relay UE accesses the network, and the relay UE assumes the function of IP layer relay, and transmits data between the remote UE and the network, and the remote UE and the relay UE are connected through a side link.
  • E-UTRAN Evolved Universal Mobile Telecommunications System Terrestrial Radio Access Network, Evolved Universal Mobile Telecommunications System Terrestrial Radio Access Network
  • PDN Public Data Network, public data network
  • step 2 discover the procedure (Discovery Procedure).
  • the discovery procedure can use either model A or model B.
  • step 3 establish a connection for one-to-one communication (establishment of connection for one-to-one communication).
  • the relay UE may establish a new PDN connection for relay (Eelay UE may establish aa new PDN connection for Relay).
  • step 4 address/prefix allocation (address/prefix allocation).
  • Step 5 and Step 6 the remote UE reports (Remote UE Report).
  • the relay UE reports the ID (Identification, identity certificate) and IP (Internet Protocol, Internet Interconnection Protocol) information of the remote UE to the network, and according to the reported message, the network learns the association relationship between the relay UE and the remote UE , so as to perform corresponding bearer/session management and configuration, so that the remote UE is connected to the network through the relay UE, and the relayed communication flow (relayed traffic) is completed.
  • ID Identity, identity certificate
  • IP Internet Protocol, Internet Interconnection Protocol
  • Rel-15 FeD2D Fluture Enhancements to Long Term Evolution Divice to Divice, the future enhancement of long-term evolution equipment to equipment
  • 3GPP studied the UE-to-network relay function based on layer 2 relay, that is, the remote UE
  • the relay UE accesses the network, and the relay UE undertakes the relay of the adaptation layer (above the Radio Link Control Protocol (Radio Link Control, RLC) layer, and below the Packet Data Convergence Protocol (PDCP) layer)
  • RLC Radio Link Control Protocol
  • PDCP Packet Data Convergence Protocol
  • the transparent forwarding satellite network architecture can be shown in Figure 6.
  • the satellite network architecture for regenerative forwarding can be shown in Figure 7.
  • the relay UE is connected to a satellite, the satellite is connected to a network device on the ground, and the network device is connected to a data network, so that the relay UE accesses the data network through the NTN.
  • the remote UE establishes a connection with the relay UE, and can access the data network through the relay UE.
  • the UE can connect to the 5GCN via the NG-RAN of the NTN based on transparent forwarding or regenerative forwarding.
  • the satellite network architecture of the 5G scenario can be shown in Figure 8 and Figure 9, Figure 8 shows the satellite network architecture of transparent forwarding in the 5G scenario, and Figure 9 shows the satellite network architecture of regenerative forwarding in the 5G scenario.
  • the UE-to-Network Relay can enhance coverage and terminal energy saving.
  • the UE-to-Network Relay may include three coverage scenarios, which are based on the UE connecting to the base station in the ground communication network to access the network way for example.
  • the UE-to-Network Relay UE is within the coverage of the base station.
  • the Remote UE is not within the coverage of the base station, that is, outside the coverage of the base station.
  • both the Relay UE and Remote UE of UE-to-Network are within the coverage of a base station.
  • the Relay UE and Remote UE of UE-to-Network are in different cells.
  • the NR (New Radio) Uu interface is used between the Relay UE and gNB (next Generation NodeB, next-generation base station), and the sidelink between the Relay UE and the Remote UE Adopt PC5 interface.
  • the cross-RAT UE (Remote UE or Relay UE) configuration and control are not considered, that is, the eNB/ng-eNB cannot control and configure the Remote UE and Relay UE of NR.
  • unicast data transmission is used between the Remote UE and the data network. After the PC5-RRC connection is established between the Relay UE and the Remote UE, the unicast data relay between the Remote UE and the data network can be realized.
  • the Uu RRC state of the Relay UE and the Remote UE can change.
  • Relay UE and Remote UE can perform relay discovery in any RRC state.
  • the Remote UE is not within the coverage of Uu, the Remote UE can perform relay discovery.
  • Relay UE must be in the RRC_CONNECTED state to perform unicast data relay.
  • Relay selection refers to the process in which a remote device selects a relay device for access.
  • Relay reselection refers to the process in which the remote device is currently connected to a relay device and reselects the relay device to access when the trigger condition is met.
  • the relay selection and relay reselection are the process of relay determination, that is, the process of determining the relay device to be accessed by the remote device. The flow of the relay determination method will be described in detail below through the embodiment shown in FIG. 11 .
  • FIG. 11 shows a flowchart of a method for determining a relay provided in an exemplary embodiment of the present application. The method is executed by a remote device, and the method includes:
  • Step 1101 Perform relay selection or relay reselection according to the network access mode of the candidate relay device; wherein, the network access mode includes NTN access or terrestrial access.
  • NTN access refers to non-terrestrial communication network access.
  • Terrestrial access refers to terrestrial communications network (Terrestrial Communications Network, TCN) access.
  • NTN access may be accessed through satellite communication, and the network elements involved may include satellite and ground network equipment.
  • the relay equipment is connected to the satellite, and the satellite is connected to the network equipment connected to the data network on the ground. In this way, the relay device performs data interaction with the data network through the satellite.
  • Base station access can be used for ground communication network access, and the involved network elements can include base stations, and relay equipment is connected to base stations, through which data interactions can be performed with the data network.
  • the UE is directly connected to the base station.
  • the UE and the base station need to use the signal forwarding function of the satellite to realize data interaction, and the distance between the UE and the satellite and the distance between the satellite and the ground network equipment is too large, which will inevitably lead to the data transmission speed of NTN access.
  • the data transmission speed is lower than that of terrestrial access, and the delay of data transmission between the UE and the data network during NTN access will be greater than that of terrestrial access.
  • a candidate relay device with a relatively small transmission delay can be selected to access a better cell, improving the communication service of the cell accessed by the remote device quality, avoiding that the remote device selects the candidate relay device connected to the ground base station through the satellite when the network access method of the candidate relay device is unknown, so that the communication service quality of the accessed cell is poor and cannot meet the requirements
  • Some business requirements of the remote device may be instant messaging services, audio and video live broadcast services, and the like.
  • the network access mode of the candidate relay device is carried in a discovery message (Discovery Message) of the candidate relay device.
  • the sending of the discovery message may include two modes, which means that the UE-to-Network Relay supports two discovery models, Model (Model) A and Model B.
  • Model A candidate relays can send discovery messages.
  • the remote device After receiving the discovery message of the candidate relay device, the remote device can perform relay selection or relay reselection.
  • Model B remote devices can send discovery messages, and candidate relay devices and remote devices can also send discovery messages.
  • the remote device can send a discovery message, and the candidate relay device can send a discovery message after receiving the discovery message from the remote device. When the remote device receives the discovery message of the candidate relay device, relay selection can be performed.
  • the remote device By carrying the network access method in the discovery message of the candidate relay device, the remote device can clearly know the network access method of the candidate relay device after receiving the sent message, and then can select the network access method based on the network access method.
  • the discovery message is the basic message in the process of relay selection or relay reselection.
  • the notification of the network access method can be realized without a large number of modifications to the original discovery mechanism.
  • the implementation method is simple, easy to configure, and has good practicability.
  • the protocol stack of the discovery message is shown in Figure 12. Assuming that the remote device and the relay device are UE A and UE B respectively, both UE A and UE B can send a discovery message when triggered by a higher layer.
  • the sending of the discovery message may be supported by the radio resource control (Radio Resource Control, RRC) layer in the UE, and the RRC layer is used to support system messages, admission control, security management, measurement and reporting, handover and mobility, and NAS messages Transmission, radio resource management.
  • the lower layer of the RRC layer is the packet data convergence protocol (Packet Data Convergence Protocol, PDCP) layer, the radio link layer control protocol (Radio Link Control, RLC) layer, the media access control (Media Access Control, MAC) layer and the physical ( Physical, PHY) layer.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC media access control
  • Physical, PHY Physical, Physical, PHY
  • the PDCP layer is used to transmit user plane and control plane data, maintain PDCP SN numbers, routing and repetition (dual connection scenario), encryption/decryption and integrity protection, reordering, support for out-of-order delivery, duplicate discarding, ROHC (user plane ).
  • the RLC layer is used for error detection and error correction ARQ (AM entity); segmentation reassembly (UM entity and AM entity); re-segmentation (AM entity); repeated packet detection (AM entity).
  • the MAC layer is used for mapping between logical channels and transport channels, multiplexing/demultiplexing, scheduling, HARQ, and logical channel priority setting.
  • the physical layer provides radio resources and physical layer processing for high-level data. The upper layers refer to layers higher than the physical layer.
  • the Relay UE may have the following characteristics related to sending discovery messages.
  • the Relay UE When in the RRC_IDLE or RRC_INACTIVE state, if the base station provides the minimum and maximum Uu signal strength thresholds, the Relay UE sends discovery messages within the minimum and maximum Uu signal strength thresholds. If the base station does not provide the minimum and maximum Uu signal strength thresholds, the Relay UE can send a discovery message based on preconfiguration.
  • the base station can be different. For example, in a 3G network environment, the base station is an NB. In a 4G network environment, the base station is an eNB. In a 5G network environment, the base station is a gNB.
  • Relay UE is allowed to send discovery messages in all RRC states according to the sidelink communication configuration provided by the base station.
  • Relay UE based on layer 2 relay UE-to-network Relay should always be connected to a base station capable of Sidelink Relay operation, and the base station should be able to provide configuration for discovery message transmission.
  • the Remote UE may have the following characteristics related to the sending of discovery messages.
  • the Remote UE in the RRC_IDLE and RRC_INACTIVE states is allowed to send discovery messages.
  • Feature 2 Whether the Remote UE in the RRC_CONNECTED state is allowed to send discovery messages depends on the configuration provided by the serving base station. The configuration details provided by the serving base station need further discussion.
  • Remote UE does not need additional network configuration for Uu measurement in RRC_IDLE or RRC_INACTIVE state.
  • Remote UEs that are not within the coverage of the base station are always allowed to transmit discovery messages based on pre-configuration before they are connected to the network through the Relay UE.
  • Feature 5 When a Remote UE that supports UE-to-network Relay is directly connected to a base station that does not have Sidelink Relay operation, if its serving carrier is not shared with the Sidelink carrier, it is allowed to send discovery messages based on at least pre-configuration.
  • Feature 6 For the Remote UE of UE-to-network Relay based on layer 3 relay, if the Remote UE is not within the coverage of the base station and indirectly connected to the base station, it is impossible for the serving base station to provide radio configuration to send discovery messages.
  • Feature 7 For the Remote UE of the UE-to-network Relay based on layer 2 relay, if the Remote UE is not within the coverage of the base station and is indirectly connected to the base station, it is allowed or not allowed to send discovery messages according to the configuration provided by the base station.
  • the network access mode of the candidate relay device is based on at least one of the first indication information, the second indication information, the delay information of the first communication link, the third indication information or the fourth indication information information instructions. These types of information are described below.
  • the first indication information is used to indicate whether the first communication link is accessed through the NTN, and the first communication link is a communication link between the candidate relay device and the base station. That is, the first indication information is used to indicate whether the first communication link is accessed through the NTN or ground. It can be understood that, when the first indication information indicates that the first communication link is accessed through NTN, the network access mode of the candidate relay device is NTN access. When the first indication information indicates that the first communication link is not accessed through NTN, or when the first indication information indicates that the first communication link is accessed through the ground, the network access mode of the candidate relay device for ground access.
  • the first communication link may be a Uu link, that is, the communication between the candidate relay device and the base station is implemented based on the Uu interface.
  • the UE accesses the gNB of the 5G NR system through the Uu interface, which is the most important open interface in the 5G NR system.
  • the first indication information may be represented by 0 or 1.
  • the first indication information is 0 or 1, and is respectively used to indicate NTN access or terrestrial access.
  • the first indication information is 0, and the first indication information is used to indicate that the first communication link is accessed through the NTN.
  • the first indication information is 1, and the first indication information is used to indicate that the first communication link is accessed through the ground.
  • the first indication information is 0, and the first indication information is used to indicate that the first communication link is accessed through the ground.
  • the first indication information is 1, and the first indication information is used to indicate that the first communication link is accessed through the NTN.
  • the first indication information may be 1 bit (bit) information.
  • the information amount of the first indication information may not be 1 bit, but other numerical values, which is not limited in this embodiment of the present application.
  • the second indication information is used to indicate the NTN type of the first communication link.
  • the NTN type may be determined according to the type of the satellite to which the first communication link is connected.
  • NTN types may include GEO, LEO, or High Altitude Platform Station (HAPS).
  • HAPS High Altitude Platform Station
  • the NTN type may include MEO, HEO, or other types in addition to GEO, LEO, and HAPS. This embodiment of the present application does not specifically limit which types the NTN type includes.
  • the network access mode of the candidate relay device is NTN access.
  • the second indication information not only indicates that the candidate relay device accesses through the NTN, but also indicates which type of satellite the candidate relay device accesses.
  • the second indication information may be about 2 bits (bits) of information.
  • the information amount of the first indication information may be other values instead of 2 bits, which is not limited in this embodiment of the present application.
  • the delay information of the first communication link is used to represent the delay of the first communication link, that is, may represent the signal quality of the first communication link.
  • the time delay of the first communication link accessed by the NTN is greater than the time delay of the first communication link accessed by the ground.
  • a first threshold may be set to divide delay information of different network access modes. If the delay information is greater than the first threshold, the network access mode of the candidate relay device is NTN access. When the delay information is less than or equal to the first threshold, the network access mode of the candidate relay device is ground access.
  • the first threshold may be pre-configured, configured by the base station, determined according to the type of the remote device, or determined according to the service type registered by the remote device.
  • the value of the first threshold is not limited, nor is its configuration or determination manner limited.
  • the delay information of the first communication link may adopt different quantized delay levels.
  • different delay ranges may be set, and different delay ranges correspond to different delay levels.
  • the delay level of the first communication link may be determined in which delay range the delay of the first communication link falls.
  • the number of delay levels may be two or more, which is not limited in this embodiment of the present application. Carrying the quantized delay level during signaling transmission can better reduce the signaling overhead than carrying the unquantized delay level.
  • the third indication information is used to indicate the cell type of the NTN cell of the first communication link.
  • the cell type of the NTN cell may include earth fixed type and earth mobile type.
  • the earth fixed type is represented by an earth fixed cell
  • the earth moving type is represented by an earth moving cell.
  • the cell type of the NTN cell of the first communication link is the earth fixed type (earth fixed cell), which means that the satellite that the candidate relay device accesses is GEO, the GEO is synchronous with the rotation of the earth, and GEO provides services for the ground
  • the range can be fixed, so the GEO serving cell is called an earth fixed cell.
  • the cell type of the NTN cell of the first communication link is earth moving cell, which means that the satellite that the candidate relay device accesses is not GEO, and the satellite is not synchronized with the rotation of the earth.
  • the range of the cell that the satellite provides services to the ground changes, so it is called the earth moving cell.
  • the fourth indication information is used to indicate the remaining cell service time or cell service stop time of the NTN cell of the first communication link.
  • the fourth indication information may be represented by cell leaving time.
  • the remaining cell service time represents a period of time, that is, how long the NTN cell can still provide services. For example, the remaining cell service time is 5 minutes (min).
  • the cell service stop time indicates a certain time point, that is, when the NTN cell stops serving. For example, the service stop time of the cell is 15:00 today, which is used to indicate that the service of the NTN cell is stopped at 15:00 today.
  • UTC Universal Time Coordinated, Coordinated Universal Time
  • the cell service stop time may also adopt other time, for example, time in a certain international time zone. The embodiment of the present application does not limit which time is used for the service stop time of the cell.
  • the discovery message of the candidate relay device does not carry any of the above information, and it can be understood that its network access method is ground connection. enter.
  • the method of indicating the network access method through the above at least one information is flexible and intuitive, and can clearly inform the remote device of the network access method of the candidate relay device.
  • the candidate relay device can also be notified The device informs the remote device of more information, so that the remote device can select a better candidate relay device when performing relay selection, so as to improve the communication service quality.
  • the network access mode of the candidate relay device is indicated by the above at least one type of information.
  • the network access mode of the candidate relay device may be based on the above at least An information ok.
  • the determination process of the network access mode of the candidate relay device may be determined through the following steps 1301 to 1303 .
  • Step 1301 The candidate relay device sends a discovery message.
  • Step 1302 the remote device receives the discovery message of the candidate relay device.
  • Step 1303 The remote device determines the network access mode of the candidate relay device according to the information carried in the discovery message.
  • Determination method 1 When the discovery message of the candidate relay device carries the first indication information, and the first indication information is 0, determine that the network access mode of the candidate relay device is NTN access; The discovery message carried by the first indication information, and if the first indication information is 1, it is determined that the network access mode of the candidate relay device is ground access.
  • Determination method 2 When the discovery message of the candidate relay device carries the first indication information, and the first indication information is 0, determine that the network access mode of the candidate relay device is ground access; The discovery message carried by the first indication information carries the first indication information, and if the first indication information is 1, it is determined that the network access mode of the candidate relay device is NTN access.
  • the determination mode 1 and the determination mode 2 are cases where the discovery message carries the first indication information, and the first indication information is 0 or 1.
  • the network access mode of the candidate relay device is indicated by the first indication information. It has also been explained in the introduction of the first indication information that whether the first indication information is represented by 0 or 1, and the value and indicated content of the first indication information can be set by relevant technical personnel according to requirements, for example,
  • the first indication information may also be represented by 1 or 2, which is not limited in this embodiment of the present application.
  • Determination method 3 When the discovery message of the candidate relay device carries any one of the second indication information, the third indication message, and the fourth indication information, determine that the network access mode of the candidate relay device is NTN access. enter.
  • the discovery that the message carries any of the second indication information, the third indication message, and the fourth indication information includes the following situations:
  • the discovery message carries one of three types of information: carrying the second indication information, carrying the third indication message, and carrying the fourth indication message.
  • the discovery message carries two types of information: the second indication information and the third indication information, the second indication information and the fourth indication information, and the third indication information and the fourth indication information.
  • the discovery message carries three kinds of information: the second indication information, the third indication message and the fourth indication information.
  • the second indication information, the third indication message, and the fourth indication information further indicate that there is an NTN cell-related situation. If the discovery message of the candidate relay device carries the second indication information, the third indication message, and the fourth indication information Any item means that the network access mode of the candidate relay device is NTN access. Further, according to the different information carried in the discovery message, the relevant information of the NTN cell of the candidate relay device can be further determined from the discovery message, such as the NTN type, the cell type of the NTN cell, the remaining cell service time of the NTN cell, or Cell service stop time, etc.
  • Determination method 4 When the discovery message of the candidate relay device carries delay information of the first communication link, and the delay information is greater than the first threshold, determine that the network access mode of the candidate relay device is NTN access , the first communication link is a communication link between the candidate relay device and the base station.
  • Determination method five When the discovery message of the candidate relay device carries delay information of the first communication link, and the delay information is less than or equal to the first threshold, the network access mode of the candidate relay device is ground connection. enter.
  • NTN access and terrestrial access can be distinguished through the relationship between the time delay information of the first communication link and the first threshold.
  • the delay information of the first communication link accessed by the NTN is greater than the first threshold, and the delay information of the first communication link accessed by the ground is less than or equal to the first threshold.
  • Determination method 6 The discovery message of the candidate relay device does not carry any of the first indication information, the second indication information, the delay information of the first communication link, the third indication information, and the fourth indication information In this case, it is determined that the network access mode of the candidate relay device is ground access.
  • the discovery message of the candidate relay device does not carry any of the above information, and it can be understood that it is a candidate relay device for terrestrial access.
  • the discovery message of the candidate relay device accessed by the NTN will carry the above information to indicate that it is accessed through the NTN. That is, if the first communication link between the candidate relay device and the base station is established through the NTN, its discovery message additionally includes one or more of the above five types of information.
  • the above content has focused on the indication and determination of the network access mode of the candidate relay device.
  • the remote device can know whether the candidate relay device accesses the network through the NTN or through the ground. It can be understood that the time delay between the candidate relay device for ground access and the network is relatively small, and the remote device can give priority to relay selection or relay reselection according to the network access mode of the candidate relay device.
  • the network access method is a candidate relay device for ground access.
  • the remote device when performing relay selection and relay reselection, in addition to the network access mode of candidate relay devices, can also consider relay selection criteria for relay selection or relay reselection .
  • the relay determination method includes:
  • Step 1401 Perform relay selection or relay reselection according to relay selection criteria and network access modes of candidate relay devices.
  • the relay selection criterion includes at least one of the first criterion or the second criterion. That is, the relay selection criterion includes the first criterion. Alternatively, the relay selection criterion includes a second criterion. Alternatively, the relay selection criterion includes a first criterion and a second criterion.
  • the first criterion includes that the signal quality of the second communication link between the remote device and the candidate relay device satisfies a first condition.
  • the second communication link is a communication link between the remote device and the candidate relay device, and is a direct communication link between UEs.
  • the first criterion may be called an AS (Access Stratum, access stratum) criterion.
  • the second communication link may be a PC5 link, and the PC5 link is a direct link. That is, the remote device communicates with the candidate relay device through the PC5 interface.
  • the link between the remote device and the candidate relay device may be called a side link, and the side link uses a PC5 interface.
  • the signal quality of the second communication link is the signal quality of the PC5 link
  • the process of determining the signal quality of the PC5 link is the measurement process of the PC5 interface.
  • the measurement process of the PC5 interface or the process of determining the signal quality of the PC5 link can be implemented in various ways.
  • the remote device may use radio signal strength measurements of Sidelink discovery messages to evaluate the signal quality of the PC5 link of the candidate relay device. Specifically, the remote device may acquire the radio signal strength of the discovery message of the candidate relay device, and use the radio signal strength as the signal quality of the PC5 link of the candidate relay device.
  • the remote device is connected to a relay device.
  • the SL-RSRP Servicelink-Reference Signal Receiving Power, the reference signal received power of the sidelink
  • the remote device may acquire the reference signal received power on the sidelink with the connected relay device.
  • the Remote UE has a PC5-RRC connection with the Relay UE
  • how to perform RSRP measurement based on SL-RSRP and/or RSRP of the discovery message needs further discussion and decision. If there is no transmission on the Sidelink unicast link, the measurement criterion of the signal quality of the PC5 link needs to be further discussed, and this embodiment of the present application does not describe too much here.
  • the signal quality of the second communication link meets the first condition, which may be that the signal quality of the second communication link is greater than a certain threshold value, or may be that the difference from the best signal quality is within a threshold range Inside.
  • the first condition may be pre-configured, may also be pre-configured by the base station, or may be determined according to the type of the remote device, or determined according to the service type registered by the remote device. The embodiment of the present application does not limit the first condition.
  • the second criterion is that the candidate relay device satisfies the high-level criterion.
  • the high-level criterion may mean that the high-level of the candidate relay device satisfies the second condition, and the second condition may be set by relevant technical personnel according to requirements, which is not limited in this embodiment of the present application.
  • the above-mentioned first criterion is a criterion of the access stratum
  • the second criterion is a criterion of the non-access stratum
  • the second criterion may include a relay selection criterion based on a PLMN (Public Land Mobile Network, public land mobile network).
  • Relay selection based on the PLMN (Public Land Mobile Network, Public Land Mobile Network) relay selection criterion includes a PLMN selection process and a Relay selection process.
  • the remote device receives one or more PLMNs, and then checks whether these PLMNs are authorized for ProSe scenarios to determine the available PLMNs, and the remote device selects a PLMN from the available PLMNs according to the configuration.
  • the selected PLMN is the PLMN selected by the NAS (Non-Access Stratum, non-access stratum) layer. It can be understood that the number of PLMNs supported by a candidate relay device is one or more, and the number of candidate relay devices is one or more.
  • the remote device selects a candidate relay device supporting the PLMN according to the PLMN selected by the NAS (Non-Access Stratum, non-access stratum) layer.
  • NAS Non-Access Stratum, non-access stratum
  • the high-level criterion may also include other criteria, which are not listed here and are not limited in this embodiment of the present application.
  • the process of relay selection or relay reselection comprehensively considers the relay selection criterion and the network access mode of candidate relay devices, and the remote device can select the Compared with the method of relay selection based on a single factor, the relay selection or reselection is more comprehensively considered, and the selection result is better.
  • the remote device when the network access mode of the candidate relay device is NTN access, the remote device performs relay selection or relay reselection according to the network access mode of the candidate relay device, or, Relay selection or relay reselection is performed according to the network access mode of the candidate relay device and the relay selection criterion. In the case that the network access modes of all candidate relay devices are ground access, the remote device performs relay selection or relay reselection according to a relay selection criterion.
  • relay selection and relay reselection may be the same or different.
  • the relay selection and relay reselection will be described separately below.
  • the trigger conditions for relay selection are described here.
  • the trigger condition for relay selection can be any one of the following two trigger modes.
  • Trigger mode 1 The signal quality of the direct communication link of the remote device is lower than a first threshold.
  • the remote device may be located in a cell, and the remote device may be connected to the base station of the cell to access the network.
  • the communication link between the remote device and the base station is referred to as the direct communication link of the remote device.
  • the signal quality of the direct communication link directly affects the data service quality of the remote device. If the signal quality of the direct communication link of the remote device is lower than the first threshold, it means that the current data service quality of the remote device is relatively poor, and better data services can be provided for it through relay selection, thus triggering Trunk selection.
  • the first threshold may be pre-configured, or may be pre-configured by the base station, or may be determined according to the type of the remote device, or determined according to the service type registered by the remote device.
  • the embodiment of the present application does not limit the value and determination method of the first threshold.
  • the second trigger method is the high-level trigger of the remote device.
  • the upper layers refer to layers higher than the physical layer.
  • the upper layer of the remote device will instruct to perform relay selection when certain conditions are met. For example, the remote device may be out of coverage and unable to access the network, so the high layer triggers relay selection to access the network through the relay device. For another example, the remote device starts a delay-sensitive service or a service with a large amount of data, etc., which cannot be supported by the current direct communication link, and the high layer can trigger relay selection.
  • the remote device may perform relay selection according to the network access mode of the candidate relay device.
  • the candidate relay devices can be screened in one step through the relay selection criteria, and then the relay selection is performed based on the network access mode.
  • the second screening is completed, and a more suitable candidate relay device can be selected through the screening process, so as to ensure the quality of service of the accessed cell.
  • determining a relay device refers to determining and determining only one relay device.
  • all candidate relay devices that meet the relay selection criteria are determined first, that is, a first candidate relay device set that satisfies the relay selection criteria is obtained, and then in the first candidate relay device set Make further selections.
  • the number of candidate devices in the first candidate relay device set determined by the centralized selection method may be one or more, and if the first candidate relay device set only contains one candidate relay device, the It is processed according to the centralized selection method.
  • the content of the centralized selection method please refer to the content of the centralized selection method below.
  • the process includes step 1501 and step 1502 .
  • Step 1501 Determine a candidate relay device satisfying a relay selection criterion.
  • Step 1502 Perform relay selection based on the network access mode of the candidate relay device.
  • the method of selecting one by one refers to determining one candidate relay device at a time, and then performing relay selection on the candidate relay device based on the network access mode of the candidate relay device. If the remote device selects the candidate relay device determined this time, the process of determining the candidate relay device and relay selection may be stopped, that is, no new candidate relay device needs to be discovered. If the remote device gives up access to the candidate relay device determined this time, it can continue to discover the candidate relay device, and when another candidate relay device is determined next time, it can perform relay selection again.
  • the relay selection process may be any of the following situations.
  • Case 1 When the network access mode of the candidate relay device is ground access, select the candidate relay device; if the network access mode of the candidate relay device is NTN access, abandon the access candidate relay device.
  • the time delay of the first communication link accessed by the NTN is greater than the time delay of the first communication link accessed by the ground.
  • the candidate relay devices for terrestrial access are preferentially selected. Therefore, when it is determined that the network access mode of the candidate relay device is ground access, the candidate relay device may be selected. Otherwise, give up accessing the candidate relay device. After giving up access, the remote device can continue to discover other candidate relay devices.
  • the discovery message of the candidate relay device carries first indication information.
  • the remote device determines that it is ground access according to the first indication information, it selects the candidate relay device.
  • the remote device determines to access the NTN according to the first indication information, it gives up accessing the candidate relay device.
  • Case 2 When the delay information of the first communication link of the candidate relay device is less than or equal to the first threshold, select the candidate relay device, and the first communication link is the communication between the candidate relay device and the base station link: giving up access to the candidate relay device when the delay information of the first communication link of the candidate relay device is greater than the first threshold.
  • the delay information of the first communication link is less than or equal to the first threshold, it indicates that the network access mode of the candidate relay device is ground access. If the delay information of the first communication link of the candidate relay device is greater than the first threshold, it indicates that the network access mode of the candidate relay device is NTN access. The time delay of the first communication link accessed by the NTN is greater than the time delay of the first communication link accessed by the ground.
  • the candidate relay devices for terrestrial access are preferentially selected. Therefore, when it is determined that the network access mode of the candidate relay device is ground access, the candidate relay device may be selected. Otherwise, give up accessing the candidate relay device. After giving up access, the remote device can continue to discover other candidate relay devices.
  • the delay information of the first communication link is less than or equal to the first threshold, it means that the signal quality of the first communication link of the candidate relay device is relatively good, and the delay is very small, and the candidate relay device is connected to the If it is a relay device, it can obtain a higher quality of service in the cell, so you can choose to access it.
  • the delay information of the first communication link of the candidate relay device is greater than the first threshold, it indicates that the signal quality of the first communication link of the candidate relay device is not very good, and the delay is relatively large. The relay device can obtain lower cell service quality, so the access can be given up, and then other candidate relay devices can be found.
  • the discovery message of the candidate relay device carries delay information of the first communication link.
  • the remote device determines whether to select the candidate relay device according to the relationship between the time delay information of the first communication link and the first threshold.
  • Case 3 When the cell type of the NTN cell of the candidate relay device is the earth fixed type, select the candidate relay device; when the network access mode of the candidate relay device is the earth mobile type, abandon the access candidate relay device.
  • the earth fixed type can provide better and more stable cell services with better signal quality than the earth mobile type. Therefore, when selecting a relay, a candidate relay device whose cell type is an earth-fixed type is preferentially selected.
  • the discovery message of the candidate relay device carries third indication information.
  • the remote device determines that the cell type of the NTN cell is the earth fixed type according to the third indication information, it selects the candidate relay device.
  • the remote device determines that the cell type of the NTN cell is the earth mobile type according to the third indication information, it gives up accessing the candidate relay device.
  • the remaining cell service time can indicate how long the candidate relay device can still provide cell service. Understandably, in order to ensure that the service processing process will not be interrupted suddenly, the remote device may select a candidate relay device whose remaining cell service time is greater than or equal to the second threshold, so as to ensure that the service can be performed normally.
  • the second threshold may be pre-configured, configured by the base station, determined according to the type of the remote device, or determined according to the service type registered by the remote device.
  • the embodiment of the present application does not specifically limit the value and determination method of the second threshold.
  • the candidate relay device can provide service for a sufficient time to ensure normal operation of the service. If the service time of the remaining cells is less than the second threshold, it can be considered that the service time of the candidate relay device is too short, and service processing may be interrupted due to the stop of the service time of the candidate relay device.
  • the discovery message of the candidate relay device carries fourth indication information.
  • the remote device determines whether to select the candidate relay device according to the magnitude relationship between the fourth indication information and the second threshold.
  • the fourth indication information is in the form of remaining cell service time.
  • Case 5 When the difference between the cell service stop time of the NTN cell of the candidate relay device and the system time is greater than or equal to the second threshold, select the candidate relay device; the cell service of the NTN cell of the candidate relay device stops If the difference between the time and the system time is smaller than the second threshold, the access to the candidate relay device is abandoned.
  • the cell service stop time can actually be used to determine how long the candidate relay device can provide the service.
  • the difference between the cell service stop time and the system time is the above remaining cell service time.
  • the remote device may also compare the cell service stop time with the service end time of the remote device, and select the candidate relay device when the cell service stop time is after the service end time. In the case that the cell service stop time is before the service end time, the access to the candidate relay device is abandoned.
  • the discovery message of the candidate relay device carries fourth indication information.
  • the remote device determines whether to select the candidate relay device according to the relationship between the difference between the fourth indication information and the system time and the second threshold.
  • the fourth indication information is in the form of cell service stop time.
  • the relay selection process can also be performed according to other situations. For example, in one case, when the difference between the cell service stop time of the NTN cell of the candidate relay device and the system time is less than or equal to the third threshold, the candidate relay device is selected. Otherwise, give up accessing the candidate relay device. In another case, if the remaining cell service time of the NTN cell of the candidate relay device is less than or equal to the third threshold, the candidate relay device is selected. Otherwise, give up accessing the candidate relay device.
  • the third threshold may be pre-configured, configured by the base station, determined according to the type of the remote device, or determined according to the service type registered by the remote device.
  • the embodiment of the present application does not limit the value and determination method of the third threshold.
  • the service of the current remote device may be to send a message, and the candidate relay device does not need a lot of service time. Therefore, the service time of the remaining cells can be selected as small as possible to serve the remaining cells. A relatively long time is reserved for other remote devices in need.
  • the essence of the above one-by-one selection method is to select the candidate relay devices one by one according to the network access mode of the candidate relay devices, until the process of stopping when any candidate relay device is selected.
  • the one-by-one selection method may include the case of discovering multiple times, and another case is that only one candidate relay device is found when the candidate relay device is discovered. That is, after a candidate relay device is discovered once, no other candidate relay device is found subsequently. If the candidate relay device is found only once, the remote device can handle it according to any one of the above five cases. If multiple times are found, the relay selection process can also be explained through the following expressions.
  • candidate relay devices i is an integer; in the case that the i-th candidate relay device does not meet any selection condition in the third selection condition set, for the i+1th candidate that meets the relay selection criteria The relay device performs relay selection.
  • the third selection condition set includes at least one of the following selection conditions:
  • the network access method is ground access
  • the delay information of the first communication link is less than or equal to the first threshold, and the first communication link is the communication link between the i-th candidate relay device and the base station;
  • the cell type of the NTN cell is the earth fixed type
  • the remaining cell service time of the NTN cell is greater than or equal to the second threshold
  • the difference between the cell service stop time of the NTN cell and the system time is greater than or equal to the second threshold.
  • the candidate relay devices can be directly processed in a centralized manner. First determine all candidate relay devices that meet the relay selection criteria, and use the determined candidate relay devices as the first candidate relay device set, and then perform relay selection from the determined first candidate relay device set .
  • the centralized selection method can be realized through steps 1 and 2.
  • Step 1 Determine a first set of candidate relay devices satisfying the relay selection criterion.
  • Step 2 In the first set of candidate relay devices, relay selection is performed based on the network access modes of the candidate relay devices.
  • the remote device can first determine all candidate relay devices that meet the relay selection criteria, and this determination step has screened out all candidate relay devices that need to be further selected based on the network access mode up. Subsequent remote devices can select from the first set of candidate relay devices in step 2, and no other candidate relay devices are found. In this way, all candidate relay devices satisfying the relay selection criteria are collectively determined, and then the most suitable candidate relay devices are preferentially selected according to the network access mode, which can greatly guarantee the communication quality of the selected candidate relay devices.
  • the first set of candidate relay devices includes one or more candidate relay devices.
  • the remote device judges whether the discovered candidate relay device satisfies the relay selection criterion, and if so, adds it to the first set of candidate relay devices. If not, there is no need to add.
  • the remote device may find that there are multiple candidate relay devices satisfying the relay selection criterion, and then the remote device may further determine access candidate relay devices based on the relay selection process corresponding to the centralized selection mode.
  • the remote device may find that there is only one candidate relay device that satisfies the relay selection criterion, so that only one candidate relay device is included in the first candidate relay device set, and the remote device can also select based on centralized The relay selection process corresponding to the mode is used to determine whether to access the candidate relay device.
  • the relay selection process corresponding to the centralized selection mode may be any of the following situations.
  • Case 1 In the first set of candidate relay devices, a candidate relay device whose network access mode is ground access is preferentially selected.
  • Case 2 In the first set of candidate relay devices, preferentially select candidate relay devices whose delay information of the first communication link is less than or equal to the first threshold, and the first communication link is between the candidate relay device and the base station communication link.
  • Case 3 In the first set of candidate relay devices, the candidate relay device with the smallest delay information of the first communication link is preferentially selected.
  • the candidate relay device In the first candidate relay device set, the candidate relay device whose network access method is terrestrial access is preferentially selected, and the network access method is NTN access and the cell type of the NTN cell is earth fixed type. candidate relay device.
  • the candidate relay device In the first candidate relay device set, the candidate relay device whose network access method is ground access is preferentially selected, the network access method is NTN access and the remaining cell service time of the NTN cell is greater than or Candidate relay devices equal to the second threshold.
  • the candidate relay device whose network access method is ground access is selected first, and the network access method is NTN access and the remaining cell service time of the NTN cell is the largest.
  • the candidate relay device whose network access method is ground access is selected first, and the network access method is NTN access and the remaining cell service time of the NTN cell is the largest.
  • Case 7 In the first candidate relay device set, the candidate relay device whose network access mode is ground access is firstly selected, and the network access mode is NTN access as the second priority, and the cell service stop time of the NTN cell is the same as that of the system Candidate relay devices whose time difference is greater than or equal to the second threshold.
  • Case 8 In the first candidate relay device set, the candidate relay device whose network access mode is ground access is firstly selected, and the network access mode is NTN access as the second priority, and the cell service stop time of the NTN cell is the same as that of the system The candidate relay device with the largest time difference.
  • the candidate relay devices for ground access are given priority. If the network access methods of the candidate relay devices in the determined first set of candidate relay devices are all NTN access, you can , according to other factors for sub-priority selection.
  • the relay selection process can also be performed according to other situations.
  • the candidate relay devices whose network access mode is ground access are preferentially selected, and the cell service stop time of the NTN cell of the candidate relay devices is secondly selected.
  • Candidate relay devices whose difference with the system time is less than or equal to the third threshold.
  • the candidate relay device whose network access method is ground access is preferentially selected, and the remaining cell service time of the NTN cell of the candidate relay device selected second is less than or Candidate relay devices equal to the third threshold of candidate relay devices.
  • the candidate relay device whose network access method is ground access is preferentially selected, and the candidate relay device whose NTN cell has the smallest remaining cell service time is secondly selected Candidate relays for candidate relays.
  • the candidate relay device whose network access method is ground access is preferentially selected, and the candidate relay device whose NTN cell has the smallest remaining cell service time is secondly selected Candidate relays for candidate relays.
  • the candidate relay device whose network access method is ground access is firstly selected, and the candidate relay device whose NTN cell service stop time and the system time has the smallest difference is secondly selected Candidate relay device.
  • the third threshold may be pre-configured, configured by the base station, determined according to the type of the remote device, or determined according to the service type registered by the remote device.
  • the embodiment of the present application does not limit the value and determination method of the third threshold.
  • the current remote device business is to send a message, and it does not require a lot of service time for the candidate relay device. Therefore, the service time of the remaining cells can be selected as small as possible to serve the remaining cells. A relatively long time is reserved for other remote devices in need.
  • the remote device can determine a more suitable candidate relay device from the multiple candidate relay devices based on the foregoing situations.
  • the remote device also performs relay selection through the above-mentioned situations, but it does not need to compare with other candidate relay devices when determining the preferred selection scheme. I won't go into details here.
  • the remote device in addition to the network access mode of the candidate relay device, the remote device may also consider its own characteristics.
  • the characteristics of the remote device include: at least one of the type of the remote device and the registered service type.
  • relay selection when performing relay selection, it may be selected one by one or collectively.
  • a relay device is determined based on the relay selection criteria each time, and then relay selection is performed on the relay device based on the network access method and the characteristics of the remote device to determine whether to access the relay device.
  • Candidate relay device In the centralized selection method, all candidate relay devices that meet the relay selection criteria are determined first, that is, a first candidate relay device set that satisfies the relay selection criteria is obtained, and then in the first candidate relay device set Make further selections.
  • the relay selection process can be implemented through the following steps 1 and 2.
  • Step 1 Determine a candidate relay device that satisfies the relay selection criterion.
  • Step 2 Perform relay selection based on the characteristics of the remote device itself and the network access mode of the candidate relay device.
  • This step 1 is the same as step 1501 in the manner of not considering the characteristics of the remote device itself, and details will not be repeated here.
  • step 2 The difference between this step 2 and the above step 1502 is that, in addition to the network access mode of the candidate relay device, the characteristics of the remote device are also considered.
  • a candidate relay device for ground access selects a candidate relay device for ground access. If there is no candidate relay device for terrestrial access, when it is determined to support NTN access according to its own characteristics, a candidate relay device for NTN access may be selected.
  • the method of selecting one by one refers to determining one candidate relay device at a time, and then performing relay selection on the candidate relay device based on the network access mode of the candidate relay device. If the remote device selects the candidate relay device determined this time, the process of determining the candidate relay device and relay selection may be stopped, that is, no new candidate relay device needs to be discovered. If the remote device gives up access to the candidate relay device determined this time, it can continue to discover the candidate relay device, and when another candidate relay device is determined next time, it can perform relay selection again.
  • the relay selection process may be any of the following situations.
  • Case 1 When the network access mode of the candidate relay device is ground access, the candidate relay device is selected.
  • Case 2 When the network access mode of the candidate relay device is NTN access, and the characteristics of the remote device support NTN access, the candidate relay device is selected.
  • the remote device's own characteristics support NTN access, for example, the service type registered by the remote device is not a delay-sensitive service, or the device type of the remote device supports NTN access, you can choose The candidate relay device is accessed.
  • the essence of the above one-by-one selection method is to select the candidate relay devices one by one according to the network access mode of the candidate relay devices and the characteristics of the remote device, and stop the process until any candidate relay device is selected.
  • the way of selecting one by one may include the case of discovering multiple times, and another case is that only one candidate relay device is found when the candidate relay device is discovered. That is, after a candidate relay device is discovered once, no other candidate relay device is found subsequently. If the candidate relay device is found only once, the remote device can handle it according to any one of the above five cases. If multiple times are found, the relay selection process can also be explained through the following expressions.
  • the fourth selection condition set includes at least one of the following selection conditions:
  • the network access method is ground access
  • the delay information of the first communication link is less than or equal to the first threshold, and the characteristics of the remote device support NTN access, and the first communication link is the communication link between the i-th candidate relay device and the base station;
  • the cell type of the NTN cell is the fixed earth type, and the characteristics of the remote equipment support NTN access;
  • the remaining cell service time of the NTN cell is greater than or equal to the second threshold, and the characteristics of the remote device support NTN access;
  • the difference between the cell service stop time of the NTN cell and the system time is greater than or equal to the second threshold, and the characteristics of the remote device support NTN access.
  • the candidate relay devices can be directly processed in a centralized manner. First determine all candidate relay devices that meet the relay selection criteria, and use the determined candidate relay devices as the first candidate relay device set, and then perform relay selection from the determined first candidate relay device set .
  • the centralized selection method can be realized through steps A and B.
  • Step A Determine a first set of candidate relay devices satisfying the relay selection criterion.
  • Step B In the first set of candidate relay devices, relay selection is performed based on the characteristics of the remote device itself and the network access mode of the candidate relay devices.
  • This step A is the same as the steps in the above-mentioned manner not considering the characteristics of the remote device itself, and will not be described in detail here.
  • step B compared with step 2 in the above method that does not consider the characteristics of the remote device, in addition to considering the network access mode of the candidate relay device, the characteristics of the remote device are also considered.
  • the first set of candidate relay devices includes one or more candidate relay devices.
  • the remote device judges whether the discovered candidate relay device satisfies the relay selection criterion, and if so, adds it to the first set of candidate relay devices. If not, there is no need to add.
  • the remote device may find that there are multiple candidate relay devices satisfying the relay selection criterion, and then the remote device may further determine access candidate relay devices based on the relay selection process corresponding to the centralized selection mode.
  • the remote device may find that there is only one candidate relay device that satisfies the relay selection criterion, so that only one candidate relay device is included in the first candidate relay device set, and the remote device can also select based on centralized The relay selection process corresponding to the mode is used to determine whether to access the candidate relay device.
  • the centralized selection The relay selection process corresponding to the centralized selection method may be: in the first candidate relay device set, preferentially select candidate relay devices whose network access mode is ground access; In the case of supporting NTN access, a candidate relay device that satisfies any selection condition in the second selection condition set is selected secondarily.
  • the second selection condition set includes at least one of the following selection conditions:
  • the delay information of the first communication link is less than or equal to the first threshold, and the first communication link is a communication link between the candidate relay device and the base station;
  • the delay information of the first communication link is the smallest
  • the cell type of the NTN cell is the earth fixed type
  • the remaining cell service time of the NTN cell is greater than or equal to the second threshold
  • the remaining cell service time of the NTN cell is the largest
  • the difference between the cell service stop time of the NTN cell and the system time is greater than or equal to the second threshold
  • the candidate relay device with the largest difference between the cell service stop time of the NTN cell and the system time.
  • the first indication information is called the indication information that the Uu link between the Relay UE and the gNB is NTN access
  • the second indication information is called the NTN access type indicating the Uu link of the Relay UE
  • the delay information of the first communication link is called the delay information of the Uu link of the Relay UE
  • the third indication information is called earth fixed/earth moving cell indication information.
  • the fourth indication information is called cell leaving time information.
  • the discovery message of the Relay UE includes indication information indicating that the Uu link between the Relay UE and gNB is NTN access, and/or indicating the NTN access type (such as GEO, LEO, etc.) of the Uu link of the Relay UE , and/or delay information of the Uu link of the Relay UE, and/or earth fixed/earth moving cell indication information, and/or cell leaving time information.
  • the Remote UE performs relay selection according to the information in the discovery message, as follows:
  • the Remote UE confirms whether the Uu link between the Relay UE and the gNB is accessed through the NTN according to the information carried in the discovery message.
  • the confirmation method is: if the above information of the Relay UE is found in the message, the Remote UE considers that there is NTN access between the Relay UE and the gNB.
  • the Remote UE determines that the Relay UE is the all The selected Relay UE (that is, the selected Relay UE to access).
  • the Remote UE determines that the Relay UE is not selected the Relay UE, that is, to abandon the Relay UE.
  • the discovery message of the Relay UE includes the delay information of the Uu link between the Relay UE and the gNB.
  • the Remote UE performs relay selection according to the delay information in the discovery message, as follows:
  • the Remote UE determines that the Relay UE is the selected Relay UE.
  • the threshold can be pre-configured or provided by gNB through SIB/RRC message, and can also be determined by the terminal according to its own terminal type and/or registered service type (similar to Example 3).
  • the Remote UE selects the Relay UE with the smallest Uu link delay as the selected Relay UE.
  • the Remote If the Relay UE is not the selected Relay UE, the UE abandons the Relay UE.
  • the discovery message of the Relay UE includes indication information indicating that the Uu link between the Relay UE and the gNB is NTN access and/or indicating the NTN access type (such as GEO, LEO, etc.) of the Uu link of the Relay UE and /or delay information of the Uu link of the Relay UE and/or earth fixed/earth moving cell indication information and/or cell leaving time information.
  • the Remote UE performs relay selection according to the above information in the discovery message, as follows:
  • -Remote UE determines whether to support the NTN access type of the Uu link of the Relay UE based on its own characteristics or capabilities, such as the terminal type of the UE, the service type registered by the UE, etc.;
  • the Remote UE determines that the Relay UE is selected The Relay UE. For example, if the Remote UE is an industrial sensor type terminal in the RedCap terminal, and its service is not sensitive to delay and is suitable for NTN transmission, it can be determined that the Remote UE's own terminal type and/or registered service type support the Relay UE.
  • the Remote UE It is determined that the Relay UE is not the selected Relay UE, that is, the Relay UE is abandoned.
  • eMBB Enhanced Mobile Broadband, enhanced mobile broadband
  • wearable service types include delay-sensitive services such as voice. If the service type registered by Remote UE is such a delay-sensitive service, it is not applicable to long-delay services such as GEO. NTN transmission, it can be determined that the Remote UE's own terminal type and/or registered service type does not support the Relay UE.
  • the discovery message of the Relay UE includes earth fixed/earth moving cell indication information.
  • the Remote UE performs relay selection according to the earth fixed/earth moving cell indication information in the discovery message, as follows:
  • the Remote UE determines that the Relay UE is the selected Relay UE .
  • the Remote UE determines that the Relay UE is If it is not the selected Relay UE, the Relay UE is abandoned.
  • the discovery message of the Relay UE includes the cell leaving time information of the Uu link between the Relay UE and the gNB.
  • the Remote UE performs relay selection according to the cell leaving time information in the discovery message, as follows:
  • the Remote UE determines that the Relay UE is the selected Relay UE.
  • the threshold can be pre-configured or provided by the gNB through SIB/RRC messages, or can be determined by the terminal according to its own terminal type and/or registered service type (similar to Example 3).
  • the Remote UE preferentially selects a Relay UE with a smaller remaining cell service time of the Uu link as the selected Relay UE;
  • the Remote UE determines that the Relay UE is not The selected Relay UE means abandoning the Relay UE.
  • relay reselection The difference between relay reselection and relay selection is that the remote device is currently connected to a relay device, but based on the following trigger conditions, a better candidate relay device needs to be reselected.
  • the trigger conditions for relay reselection are described here.
  • the trigger condition for relay reselection can be any one of the following five trigger modes.
  • Trigger condition 1 The signal quality of the third communication link between the remote device and the connected relay device is lower than the second threshold.
  • the remote device does not judge the signal quality of the direct communication link with the base station, but judges the signal quality of the third communication link with the connected relay device. It can be understood that if the signal quality of the third communication link is not good, it means that the currently connected relay device cannot provide good data service, because relay reselection may be triggered to seek better data service.
  • the second trigger condition is that fifth indication information is received, where the fifth indication information is used to indicate disconnection from the connected relay device.
  • the fifth indication information may be issued by a high layer of the remote device, or may be sent to the remote device by a connected relay device.
  • the upper layer of the remote device sends a release message (release message) to indicate disconnection from the connected relay device.
  • the connected relay device sends fifth indication information to the remote device through the third communication link to indicate disconnection, for example, when the service of the connected relay device terminates, or when its load When the threshold is reached, the remote device may be instructed to disconnect the current link.
  • the third trigger condition is the high-level trigger of the remote device.
  • the upper layer of the remote device will instruct to perform relay reselection when certain conditions are met. For example, when the high-level of the remote device finds that the currently connected relay device cannot meet the current or more business needs, or the high-level has opened a delay-sensitive service or a service with a large amount of data, etc., the currently connected relay The device cannot support it, and the upper layer can trigger relay reselection.
  • Trigger condition 4 The remaining cell service time of the connected relay device reaches a target value.
  • the remote device When the remaining cell service time of the connected relay device reaches the target value, and the cell service of the connected relay device has ended or is about to end, the remote device performs relay reselection.
  • the target value may be preconfigured, determined according to the type of the remote device, or determined according to the service type registered by the remote device. For example, the target value is zero, or a relatively small value.
  • the embodiment of the present application does not limit the value and determination method of the target value.
  • Trigger condition five the system time has reached the cell service stop time of the connected relay device.
  • the fifth trigger condition is the same as the fourth trigger condition, the system time has reached the service stop time of the cell, the cell service of the connected relay device has ended, and the remote device can perform relay reselection.
  • the remote device can perform relay reselection according to the network access mode of the candidate relay device.
  • the relay selection criterion and the network access mode of the relay device it can be realized through the relay reselection method shown in FIG. 16 .
  • the method includes:
  • Step 1601 Determine a second set of candidate relay devices satisfying a second criterion.
  • Step 1602 From the second set of candidate relay devices, filter out the third set of candidate relay devices according to the filter condition in the first criterion, the filter condition includes that the signal quality difference with the best second communication link is within a threshold within range.
  • Step 1603 In the third set of candidate relay devices, perform relay reselection according to the network access mode of the candidate relay devices.
  • the candidate relay devices are initially screened by the second criterion, and the second set of candidate relay devices is determined, and then re-screened based on the first criterion, and the candidate relay devices with good signal quality of the second communication link are selected It is determined as the fourth set of candidate relay devices, and then relay reselection is performed based on the network access mode.
  • multi-step screening a variety of criteria and network access methods are fully utilized, so that the final selection result can provide better cell services for remote devices.
  • the threshold range can be expressed as RangetoBestRelay.
  • the filter condition may be pre-configured or configured by the base station, for example, provided by the gNB through the SIB/RRC message, which is not limited in this embodiment of the present application.
  • step 1602 and step 1603 the candidate relay devices that meet the second criterion and have relatively good signal quality of the second communication link are screened out, and there is no need to judge the network access mode of each candidate relay device, which can be greatly improved. Reduce the amount of calculation and improve the efficiency of relay reselection.
  • the remote device may perform relay reselection in any of the following situations.
  • Case 1 In the third set of candidate relay devices, the candidate relay devices whose network access mode is ground access are preferentially reselected.
  • the first priority is to reselect the candidate relay device whose network access method is terrestrial access
  • the second priority is to reselect the network access method as NTN access and the cell type of the NTN cell is Earth A candidate relay device for a fixed cell.
  • Case 3 In the fourth set of candidate relay devices, the candidate relay device with the smallest time delay of the first communication link is preferentially reselected.
  • Case 5 In the third set of candidate relay devices, the priority is to reselect the candidate relay device whose network access method is ground access, and the second priority is to reselect the network access method as NTN access and the cell service stop time of the NTN cell The candidate relay device with the largest difference from the system time.
  • the candidate relay devices for ground access are also preferentially reselected, and the third set of candidate relay devices are all NTN access
  • sub-priority reselection can be performed based on other factors. The selection reasons for these factors are the same as those for relay selection, and will not be repeated here.
  • the relay reselection process may also consider the characteristics of the remote device itself.
  • the relay reselection process may be: determine a second set of candidate relay devices that meet the second criterion, and then filter out the third candidate set from the second set of candidate relay devices according to the filtering conditions in the first criterion.
  • the screening condition includes that the difference between the signal quality of the best second communication link is within the threshold range, and finally in the third set of candidate relay devices, the priority reselection of the network access method is ground access and The candidate relay device with the best signal quality of the second communication link.
  • the first two steps are the same as above.
  • the priority is to reselect the ground access and the signal quality of the second communication link is the best. candidate relay device.
  • the third set of candidate relay devices are all candidate relay devices for NTN access, then in the case that the characteristics of the terminal device itself support NTN access, reselect the third candidate relay device set that satisfies the second priority.
  • the fourth selection condition set includes at least one of the following selection conditions:
  • the signal quality of the second communication link is the best, and the first communication link is the communication link between the candidate relay device and the base station ;
  • the delay information of the first communication link is the smallest
  • the signal quality of the second communication link among the candidate relay devices whose cell type of the NTN cell is the fixed earth type is the best;
  • the signal quality of the second communication link among the candidate relay devices whose remaining cell service time of the NTN cell is greater than or equal to the second threshold is the best;
  • the remaining cell service time of the NTN cell is the largest
  • the signal quality of the second communication link among the candidate relay devices whose difference between the cell service stop time of the NTN cell and the system time is greater than or equal to the second threshold is the best;
  • the candidate relay device with the largest difference between the cell service stop time of the NTN cell and the system time.
  • the candidate relay device with the best signal quality of the second communication link in the third candidate relay device set When the characteristics of the remote device do not support NTN access, reselect the candidate relay device with the best signal quality of the second communication link in the third candidate relay device set. For example, if the service type registered by the remote device is a delay-sensitive service, or the type of the remote device does not support NTN access, and the above conditions for reselection of priority and reselection of secondary priority are not satisfied, the second communication link can be selected The candidate relay device with the best signal quality of the road is selected to ensure the quality of service of the cell as much as possible.
  • the first indication information is called the indication information that the Uu link between the Relay UE and the gNB is NTN access
  • the second indication information is called the NTN access type indicating the Uu link of the Relay UE
  • the delay information of the first communication link is called the delay information of the Uu link of the Relay UE
  • the third indication information is called earth fixed/earth moving cell indication information.
  • the fourth indication information is called cell leaving time information.
  • the discovery message of the Relay UE includes indication information indicating that the Uu link between the Relay UE and the gNB is NTN access and/or indicating the NTN access type (such as GEO, LEO, etc.) of the Uu link of the Relay UE and /or delay information of the Uu link of the Relay UE and/or earth fixed/earth moving cell indication information and/or cell leaving time information.
  • the Remote UE performs relay reselection according to the above information in the discovery message, as follows:
  • the -Remote UE confirms whether the Uu link between Relay UE and gNB is NTN access according to the information in the discovery message.
  • the confirmation method is: if the discovery message of a Relay UE contains the above information, the Remote UE considers that the Uu link between the Relay UE and the gNB is NTN access.
  • the Remote UE sorts the current Relay UE (the Relay UE to which the Remote UE is connected) and candidate Relay UEs according to the RSRP-based access layer relay reselection criteria:
  • the -Remote UE determines the candidate Relay UE through rangeToBestRelay. Among them, the difference between the PC5 signal quality of the candidate Relay UE and the best Relay UE is within the rangeToBestCell range.
  • the best PC5 signal quality of the Relay UE refers to the maximum value of the PC5 signal quality of the Relay UEs sorted above.
  • the Remote UE can preferentially select the Relay UE with the best PC5 signal quality whose Uu link between the Relay UE and the gNB is not NTN access (that is, ground access) among the candidate Relay UEs as the target Relay UE.
  • the Remote UE selects the Relay UE with the best PC5 signal quality as the target Relay UE.
  • rangeToBestRelay can be pre-configured or provided by gNB through SIB/RRC message.
  • the discovery message of the Relay UE includes the earth fixed/earth moving cell indication information of the Uu link between the Relay UE and the gNB.
  • the Remote UE performs relay reselection according to the earth fixed/earth moving cell indication information in the discovery message, as follows:
  • the Remote UE sorts the current Relay UE and candidate Relay UEs according to the RSRP-based access layer relay reselection criteria:
  • the Remote UE determines the candidate Relay UE through rangeToBestRelay. Among them, the difference between the PC5 signal quality of the candidate Relay UE and the best Relay UE is within the rangeToBestCell range.
  • the best PC5 signal quality of the Relay UE refers to the maximum value of the PC5 signal quality of the Relay UEs sorted above.
  • the Remote UE may, among the candidate Relay UEs, preferentially select the Relay UE with the best PC5 signal quality whose Uu link between the Relay UE and the gNB is not accessed by NTN as the target Relay UE.
  • the Remote UE preferably selects the Uu link between the Relay UE and the gNB as an earth connection among the Relay UEs connected to the NTN.
  • the Relay UE with the best PC5 signal quality in the fixed cell is the target Relay UE.
  • the Remote UE selects the best PC5 signal
  • the quality Relay UE is the target Relay UE.
  • rangeToBestRelay can be pre-configured or provided by gNB through SIB/RRC message.
  • the discovery message of the Relay UE includes the delay information of the Uu link between the Relay UE and the gNB.
  • the Remote UE performs relay reselection according to the delay information of the Uu link in the discovery message, as follows:
  • the Remote UE sorts the current Relay UE and candidate Relay UEs according to the RSRP-based access layer relay reselection criteria.
  • the Remote UE determines the candidate Relay UE through rangeToBestRelay. Among them, the difference between the PC5 signal quality of the candidate Relay UE and the best Relay UE is within the rangeToBestCell range.
  • the best PC5 signal quality of the Relay UE refers to the maximum value of the PC5 signal quality of the Relay UEs sorted above.
  • the Remote UE can select the Relay UE with the smallest Uu link delay as the target Relay UE among the candidate Relay UEs.
  • rangeToBestRelay can be pre-configured or provided by gNB through SIB/RRC message.
  • the discovery message of the Relay UE includes the cell leaving time information of the Uu link between the Relay UE and the gNB.
  • the Remote UE performs relay reselection according to the cell leaving time information in the discovery message, as follows:
  • the Remote UE sorts the current Relay UE and candidate Relay UEs according to the RSRP-based access layer relay reselection criteria.
  • the Remote UE determines the candidate Relay UE through rangeToBestRelay, wherein the difference between the PC5 signal quality of the candidate Relay UE and the best Relay UE is within the rangeToBestCell range.
  • the best PC5 signal quality of the Relay UE refers to the maximum value of the PC5 signal quality of the Relay UEs sorted above.
  • the Remote UE may, among the candidate Relay UEs, preferentially select the Relay UE with the best PC5 signal quality whose Uu link between the Relay UE and the gNB is not accessed by NTN as the target Relay UE.
  • the Remote UE selects The Relay UE with the longest/largest remaining cell service time of the Uu link is the target Relay UE.
  • rangeToBestRelay can be pre-configured or provided by gNB through SIB/RRC message.
  • a Relay UE that is not NTN-accessed can also be regarded as having unlimited remaining cell service time.
  • the Remote UE does not need to distinguish whether the Relay UE is for NTN access or non-NTN access, and directly sorts all Relay UEs that meet the high-level criteria according to the RSRP-based access layer relay reselection criteria, and then determines the candidate Relay UE through rangeToBestRelay. Among them, the signal quality difference between the candidate Relay UE and the best PC5 is within the rangeToBestRelay range.
  • the Remote UE selects the Relay UE with the longest remaining cell service time of the Uu link as the target Relay UE.
  • the discovery message of the Relay UE includes indication information indicating that the Uu link between the Relay UE and the gNB is NTN access and/or indicating the NTN access type (such as GEO, LEO, etc.) of the Uu link of the Relay UE and /or delay information of the Uu link of the Relay UE and/or earth fixed/earth moving cell indication information and/or cell leaving time information.
  • the Remote UE performs relay reselection according to the above information in the discovery message, as follows:
  • the Remote UE determines whether to support the NTN access type of the Uu link of the Relay UE based on its own characteristics or capabilities, such as the terminal type of the UE, the service type registered by the UE, etc.
  • the Remote UE sorts the current Relay UE and candidate Relay UEs according to the RSRP-based access layer relay reselection criteria.
  • the Remote UE determines the candidate Relay UE through rangeToBestCell. Among them, the difference between the PC5 signal quality of the candidate Relay UE and the best Relay UE is within the rangeToBestCell range.
  • the best PC5 signal quality of the Relay UE refers to the maximum value of the PC5 signal quality of the Relay UEs sorted above.
  • the Remote UE may, among the determined candidate Relay UEs, preferentially select the Relay UE with the best signal quality among the Relay UEs supported by the Remote UE's own terminal type and/or registered service type as the target Relay UE.
  • the Remote UE selects the Relay UE with the best signal quality as the target Relay UE.
  • rangeToBestRelay can be pre-configured or provided by gNB through SIB/RRC message.
  • Fig. 17 shows a schematic structural diagram of an apparatus for relay determination provided in an exemplary embodiment of the present application, the apparatus includes:
  • a processing module 1701 configured to perform relay selection or relay reselection according to the network access mode of the candidate relay device
  • the network access mode includes NTN access or terrestrial access.
  • the network access mode of the candidate relay device is carried in the discovery message of the candidate relay device.
  • the network access mode of the candidate relay device is indicated by at least one of the following information:
  • the first indication information is used to indicate whether the first communication link is accessed through the non-terrestrial communication network NTN, and the first communication link is a communication link between the candidate relay device and the base station;
  • the second indication information is used to indicate the NTN type of the first communication link
  • the third indication information is used to indicate the cell type of the NTN cell of the first communication link;
  • the fourth indication information is used to indicate the remaining cell service time or the cell service stop time of the NTN cell of the first communication link.
  • the device further includes a determining module, and the determining module is used for:
  • the discovery message of the candidate relay device When the discovery message of the candidate relay device carries the first indication information, and the first indication information is 0, it is determined that the network access mode of the candidate relay device is NTN access; the discovery message of the candidate relay device carries There is first indication information, and when the first indication information is 1, determine that the network access mode of the candidate relay device is ground access;
  • the discovery message of the candidate relay device carries the first indication information, and the first indication information is 0, it is determined that the network access mode of the candidate relay device is ground access;
  • the message carries the first indication information, and if the first indication information is 1, it is determined that the network access mode of the candidate relay device is NTN access;
  • the discovery message of the candidate relay device carries any one of the second indication information, the third indication message, and the fourth indication information, determine that the network access mode of the candidate relay device is NTN access;
  • the discovery message of the candidate relay device carries delay information of the first communication link, and the delay information is greater than the first threshold, it is determined that the network access mode of the candidate relay device is NTN access, and the second A communication link is a communication link between the candidate relay device and the base station;
  • the network access mode of the candidate relay device is ground access
  • the discovery message of the candidate relay device does not carry any of the first indication information, the second indication information, the delay information of the first communication link, the third indication information and the fourth indication information , determine that the network access mode of the candidate relay device is ground access;
  • the first indication information is used to indicate whether the first communication link is accessed through the non-terrestrial communication network NTN;
  • the second indication information is used to indicate the NTN type of the first communication link
  • the third indication information is used to indicate the cell type of the NTN cell of the first communication link
  • the fourth indication information is used to indicate the remaining cell service time or cell service stop time of the NTN cell of the first communication link.
  • the processing module 1701 is used to:
  • the relay selection criterion includes at least one of the first criterion or the second criterion
  • the first criterion includes that the signal quality of the second communication link between the remote device and the candidate relay device satisfies the first condition
  • the second The criterion is that the candidate relay device satisfies the high-level criterion.
  • the processing module 1701 is used to:
  • Relay selection is performed based on the network access mode of the candidate relay device.
  • the processing module 1701 is used to:
  • the candidate relay device When the network access mode of the candidate relay device is ground access, select the candidate relay device; when the network access mode of the candidate relay device is NTN access, give up access to the candidate relay device;
  • the candidate relay device when the delay information of the first communication link of the candidate relay device is less than or equal to the first threshold, select the candidate relay device, and the first communication link is the communication link between the candidate relay device and the base station when the delay information of the first communication link of the candidate relay device is greater than the first threshold, giving up access to the candidate relay device;
  • the candidate relay device when the cell type of the NTN cell of the candidate relay device is the earth fixed type, select the candidate relay device; when the network access mode of the candidate relay device is the earth mobile type, abandon the access candidate Relay equipment;
  • the candidate relay device when the remaining cell service time of the NTN cell of the candidate relay device is greater than or equal to the second threshold, select the candidate relay device; when the remaining cell service time of the NTN cell of the candidate relay device is less than the second threshold , give up access to the candidate relay device;
  • the candidate relay device when the difference between the cell service stop time of the NTN cell of the candidate relay device and the system time is greater than or equal to the second threshold, select the candidate relay device; at the cell service stop time of the NTN cell of the candidate relay device When the difference with the system time is smaller than the second threshold, the access to the candidate relay device is abandoned.
  • the processing module 1701 is used to:
  • relay selection is performed based on the network access modes of the candidate relay devices.
  • the processing module 1701 is used to:
  • the first set of candidate relay devices preferentially select candidate relay devices whose delay information of the first communication link is less than or equal to the first threshold, and the first communication link is the connection between the candidate relay device and the base station communication link;
  • the candidate relay device set preferentially select the candidate relay device with the smallest delay information of the first communication link
  • the relay device whose network access mode is terrestrial access is preferentially selected, and the network access mode is NTN access and the cell type of the NTN cell is a candidate for earth fixed type. relay equipment;
  • the relay device whose network access mode is ground access is preferentially selected, the network access mode is NTN access secondly, and the remaining cell service time of the NTN cell is greater than or equal to the first Two threshold candidate relay devices;
  • the relay device whose network access method is ground access is preferentially selected, and the candidate whose network access method is NTN access and the remaining cell service time of the NTN cell is the largest is selected secondly.
  • Relay equipment
  • the relay device whose network access mode is ground access is preferentially selected, and the network access mode is NTN access secondly.
  • the relay device whose network access mode is ground access is preferentially selected, and the network access mode is NTN access secondly.
  • At least one of the first threshold and the second threshold is:
  • the processing module 1701 is used to:
  • Relay selection based on the characteristics of the remote device and the network access mode of the candidate relay device
  • the characteristics of the remote device include: at least one of the type of the remote device and the registered service type.
  • the processing module 1701 is used to:
  • the candidate relay device when the network access mode of the candidate relay device is NTN access, and the characteristics of the remote device support NTN access, select the candidate relay device.
  • the processing module 1701 is used to:
  • relay selection is performed based on the characteristics of the remote device itself and the network access mode of the candidate relay devices;
  • the characteristics of the remote device include: at least one of the type of the remote device and the registered service type.
  • the processing module 1701 is used to:
  • the candidate relay device whose network access method is ground access is preferentially selected; when the characteristics of the remote device itself support NTN access, the second priority is to select the first selection condition set A candidate relay device for any selection condition in ;
  • the first selection condition set includes at least one of the following selection conditions:
  • the delay information of the first communication link is less than or equal to the first threshold, and the first communication link is a communication link between the candidate relay device and the base station;
  • the delay information of the first communication link is the smallest
  • the cell type of the NTN cell is the earth fixed type
  • the remaining cell service time of the NTN cell is greater than or equal to the second threshold
  • the remaining cell service time of the NTN cell is the largest
  • the difference between the cell service stop time of the NTN cell and the system time is greater than or equal to the second threshold
  • the candidate relay device with the largest difference between the cell service stop time of the NTN cell and the system time.
  • the processing module 1701 is used to:
  • relay reselection is performed according to the network access modes of the candidate relay devices.
  • the processing module 1701 is used to:
  • the priority is to reselect the candidate relay device whose network access method is terrestrial access, and the second priority is to reselect the network access method as NTN access and the cell type of the NTN cell is earth fixed The candidate relay device of the cell;
  • the third candidate relay device set preferentially reselect the candidate relay device with the smallest delay of the first communication link
  • the candidate relay device whose network access mode is ground access is reselected first, the network access mode of the second priority is NTN access, and the remaining cell service time of the NTN cell is the largest candidate relay device;
  • the priority is to reselect the candidate relay device whose network access mode is terrestrial access
  • the second priority is to reselect the network access mode as NTN access and the cell service stop time of the NTN cell is the same as The candidate relay device with the largest difference between system times.
  • the processing module 1701 is used to:
  • the candidate relay device whose network access mode is terrestrial access and whose signal quality of the second communication link is the best is preferentially reselected.
  • the processing module 1701 is used to:
  • the terminal device's own characteristics support NTN access, reselect the candidate relay device in the third candidate relay device set that satisfies any selection condition in the second selection condition set;
  • the characteristics of the remote device include: at least one of the terminal type and the registered service type;
  • the second selection condition set includes at least one of the following selection conditions:
  • the signal quality of the second communication link is the best, and the first communication link is the communication link between the candidate relay device and the base station ;
  • the delay information of the first communication link is the smallest
  • the signal quality of the second communication link among the candidate relay devices whose cell type of the NTN cell is the fixed earth type is the best;
  • the signal quality of the second communication link among the candidate relay devices whose remaining cell service time of the NTN cell is greater than or equal to the second threshold is the best;
  • the remaining cell service time of the NTN cell is the largest
  • the signal quality of the second communication link among the candidate relay devices whose difference between the cell service stop time of the NTN cell and the system time is greater than or equal to the second threshold is the best;
  • the candidate relay device with the largest difference between the cell service stop time of the NTN cell and the system time.
  • the screening conditions are:
  • the trigger condition for relay selection is:
  • the signal quality of the direct communication link of the remote device is below a first threshold
  • the trigger condition for relay reselection is:
  • the signal quality of the third communication link between the remote device and the connected relay device is lower than a second threshold
  • the high-level trigger of the remote device Or, the high-level trigger of the remote device
  • the remaining cell service time of the connected relay device reaches the target value
  • the system time has reached the cell service stop time of the connected relay device.
  • FIG. 18 shows a schematic structural diagram of a remote device provided by an exemplary embodiment of the present application.
  • the remote device includes: a processor 111 , a receiver 112 , a transmitter 113 , a memory 114 and a bus 115 .
  • the processor 111 includes one or more processing cores, and the processor 111 executes various functional applications and information processing by running software programs and modules.
  • the receiver 112 and the transmitter 113 can be implemented as a communication component, which can be a communication chip.
  • the memory 114 is connected to the processor 111 through the bus 115 .
  • the memory 114 may be used to store at least one instruction, and the processor 111 is used to execute the at least one instruction, so as to implement various steps in the foregoing method embodiments.
  • volatile or non-volatile storage devices include but not limited to: magnetic or optical disks, electrically erasable and programmable Read-Only Memory (EEPROM, Electrically Erasable Programmable Read Only Memory), Erasable Programmable Read-Only Memory (EPROM, Erasable Programmable Read Only Memory), Static Random-Access Memory (SRAM, Static Random-Access Memory), Read-Only Memory (ROM, Read Only Memory), magnetic memory, flash memory, programmable read-only memory (PROM, Programmable Read Only Memory).
  • EEPROM Electrically Erasable Programmable Read Only Memory
  • EPROM Erasable Programmable Read Only Memory
  • SRAM Static Random-Access Memory
  • ROM Read Only Memory
  • magnetic memory flash memory
  • PROM programmable read-only memory
  • a computer-readable storage medium having at least one instruction stored therein.
  • the memory includes instructions, and the above instructions can be executed by the processor to complete the above relay determining method.
  • the computer-readable storage medium can be ROM, random access memory (RAM, Random-Access Memory), compact disc read-only memory (CD-ROM, Compact Disc Read Only Memory), magnetic tape, floppy disk, and optical data storage device, etc.
  • the computer-readable storage medium is a non-transitory computer-readable storage medium.

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Abstract

本申请公开了一种中继确定方法、装置、远端设备及存储介质，属于通信领域。该方法包括：根据候选中继设备的网络接入方式进行中继选择或中继重选；其中，所述网络接入方式包括NTN接入或地面接入。不同的网络接入方式，候选中继设备与数据网络之间的延迟不同，远端设备获知候选中继设备的网络接入方式，并将此作为中继选择或中继重选的依据，能够选择一个传输时延比较小的候选中继设备，接入到更好的小区，提高了远端设备接入的小区的通信服务质量。

Description

中继确定方法、装置、远端设备及存储介质 技术领域
本申请涉及通信领域，特别涉及一种中继确定方法、装置、远端设备及存储介质。
背景技术
目前，第三代合作伙伴计划(third Generation Partnership Project，3GPP)正在研究非地面通信网络(Non-Terrestrial Network，NTN)技术。在NTN系统中，采用卫星通信的方式向用户设备(User Equipment，UE)提供通信服务。
一些远端设备可以通过中继选择，选择一个中继设备，从而通过该中继设备接入网络。如果当前连接的中继设备的接入性能不好，该远端设备还可以通过中继重选，另选一个中继设备以接入网络。
相关技术中，远端设备通过是基于参考信号接收功率(Reference Signal Received Power，RSRP)进行中继选择或中继重选。在卫星网络中，尤其在地球同步轨道(Geostationary Earth Orbit，GEO)卫星网络中，UE与卫星之间以及卫星与地面站之间的距离过大，导致了UE与数据网络之间的通信延迟会比较大，所以一些时延敏感业务并不适合在NTN网络中使用。因此，当中继设备通过卫星与地面基站建立连接时，远端设备接入该中继设备并非最优选择，可能会导致远端设备的数据服务时延较大，提供的通信服务质量较差。
发明内容
本申请实施例提供了一种中继确定方法、装置、远端设备及存储介质。所述技术方案如下：
根据本申请实施例的一方面，提供了一种中继确定方法，所述方法包括：
根据候选中继设备的网络接入方式进行中继选择或中继重选；
其中，所述网络接入方式包括NTN接入或地面接入。
根据本申请实施例的另一方面，提供了一种中继确定装置，所述装置包括：
处理模块，用于根据候选中继设备的网络接入方式进行中继选择或中继重选；
其中，所述网络接入方式包括NTN接入或地面接入。
根据本申请实施例的另一方面，提供了一种远端设备，所述远端设备包括：
一个或多个处理器；
与所述一个或多个处理器相连的一个或多个收发器；
其中，所述一个或多个处理器被配置为加载并执行可执行指令以实现上述中继确定方法。
根据本申请实施例的另一方面，提供了一种计算机可读存储介质，所述存储介质中存储有至少一条指令，所述至少一条指令由一个或多个处理器加载并执行以实现上述中继确定方法。
根据本申请实施例的另一方面，提供了一种计算机程序产品或计算机程序，所述计算机程序产品或所述计算机程序包括一条或多条指令，所述一条或多条指令存储在计算机可读存储介质中。远端设备的一个或多个处理器从计算机可读存储介质中读取所述一条或多条指令，所述一个或多个处理器执行所述一条或多条指令，使得所述远端设备执行上述中继确定方法。
在本申请实施例中，由于不同的网络接入方式，候选中继设备与数据网络之间的延迟不同，远端设备获知候选中继设备的网络接入方式，并将此作为中继选择或中继重选的依据，能够选择一个传输时延比较小的候选中继设备，接入到更好的小区，提高了远端设备接入的小区的通信服务质量，避免了远端设备在未知候选中继设备的网络接入方式的情况下，选择了通过卫星与地面基站连接的候选中继设备，从而接入的小区的通信服务质量较差，无法满足该远端设备的一些业务需求。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本申请。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是根据本申请一示例性实施例示出的透传转发的卫星网络架构的示意图；
图2是根据本申请一示例性实施例示出的再生转发的卫星网络架构的示意图；
图3是根据本申请一示例性实施例示出的5G(5th Generation Mobile Communication Technology，第五代移动通信技术)场景中透传转发的卫星网络架构的示意图；
图4是根据本申请一示例性实施例示出的5G场景中再生转发的卫星网络架构的示意图；
图5是根据本申请一示例性实施例示出的远端UE和中继UE建立连接的流程图；
图6是根据本申请另一示例性实施例示出的透传转发的卫星网络架构的示意图；
图7是根据本申请另一示例性实施例示出的再生转发的卫星网络架构的示意图；
图8是根据本申请另一示例性实施例示出的5G场景中透传转发的卫星网络架构的示意图；
图9是根据本申请另一示例性实施例示出的5G场景中再生转发的卫星网络架构的示意图；
图10是根据本申请一示例性实施例示出的UE-to-Network Relay(侧行中继)的覆盖场景的示意图；
图11是根据本申请一个示例性实施例示出的中继确定方法的流程图；
图12是根据本申请一个示例性实施例示出的发现消息的协议栈的示意图；
图13是根据本申请一个示例性实施例示出的候选中继设备的网络接入方式的确定过程的流程图；
图14是根据本申请一个示例性实施例示出的中继选择方法的流程图；
图15是根据本申请另一个示例性实施例示出的中继选择方法的流程图；
图16是根据本申请一个示例性实施例示出的中继重选方法的流程图；
图17是根据本申请一示例性实施例示出的中继确定装置的框图；
图18是根据本申请一示例性实施例示出的远端设备的结构示意图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本申请的一些方面相一致的装置和方法的例子。
目前，3GPP正在研究NTN技术。在NTN系统中，一般采用卫星通信的方式向地面UE提供通信服务。相对于地面蜂窝网通信，卫星通信具有很多独特的优点。首先，卫星通信不受用户地域的限制；例如一般的陆地通信不能覆盖海洋、高山、沙漠等无法搭设通信设备的区域，或者由于人口稀少而不做通信覆盖的区域，而对于卫星通信来说，由于一颗卫星即可以覆盖较大的地面，加之卫星可以围绕地球做轨道运动，因此，在理论上地球上每一个角落都可以被卫星通信覆盖。其次，卫星通信有较大的社会价值。卫星通信在边远山区、贫穷落后的国家或地区都能够以较低的成本覆盖到，从而使这些地区的人们享受到先进的语音通信和移动互联网技术，有利于缩小与发达地区之间的数字鸿沟，促进这些地区的发展。再次，卫星通信距离远，且通信距离增大时通讯成本没有明显增加。最后，卫星通信的稳定性高，不受自然灾害的限制。
通信卫星按照轨道高度的不同分为低地球轨道(Low-Earth Orbit，LEO)卫星、中地球轨道(Medium-Earth Orbit，MEO)卫星、GEO卫星、高椭圆轨道(High Elliptical Orbit，HEO)卫星等等。目前阶段主要研究的是LEO和GEO。
LEO：
低轨道卫星高度范围为500千米(km)～1500km，相应轨道周期约为1.5小时～2小时。UE间单跳通信的信号传播延迟一般小于20毫秒(ms)。最大卫星可视时间20分钟。信号传播距离短，链路损耗少，对UE的发射功率要求不高。
GEO：
地球同步轨道卫星，轨道高度为35786km，围绕地球旋转周期为24小时。UE间单跳通信的信号传播延迟一般为250ms。
为了保证通信卫星的覆盖以及提升整个卫星通信系统的系统容量，通信卫星采用多波束覆盖地面，一颗通信卫星可以形成几十甚至数百个波束来覆盖地面；一个卫星波束可以覆盖直径几十至上百公里的地面区域。
目前3GPP考虑的卫星有两种，一种是透明转发(transparent payload)的卫星，一种是再生转发(regenerative payload)的卫星。透明转发的卫星网络架构可以如图1所示。再生转发的卫星网络架构可以如图2所示。
如图1和图2所示，卫星网络架构中可以包括卫星和网络设备等网元，其中，网络设备用于连接卫星和地面上的数据网络。网络设备的数量为一个或多个。鉴于该网络设备在卫星网络中的功能，该网络设备可以称为NTN网关设备(Gateway)。例如，在一个具体示例中，在5G场景中，UE可以经基于透明转发或再生转发的NTN的NG-RAN(NG-Radio Access Network，5G无线接入网)连接到5GCN(5G Core Network，5G核心网)。5G场景的卫星网络架构可以如图3和图4所示，图3示出了5G场景中透明转发的卫星网络架构，图4示出了5G场景中再生转发的卫星网络架构。
对于卫星，从其提供的功能上可以分为透传载荷和再生载荷这两种，透传载荷只提供无线频率滤波，频率转换和放大的功能，它只提供信号的透明转发，不会改变其转发的波形信号。再生载荷除了提供无 线频率滤波，频率转换和放大的功能，还可以提供解调/解码，路由/转换，编码/调制的功能。再生载荷具有基站的部分或者全部功能。还卫星网络架构还包括UE，UE可以通过与卫星建立连接，通过卫星接入数据网络。UE可以通过卫星的数据转发功能与数据网络实现数据交互。其中，网络设备和卫星之间的通信链路为馈线链路(Feeder Link)，UE和卫星之间的通信链路为服务链路(Service Link)。
侧行中继技术(Rel-13/15 UE-to-network Relay)
远端设备可以是指网络覆盖范围外的设备，也可以是指网络覆盖范围内边缘区域内的设备，该远端设备可能与连接不到基站，或者与基站连接后通信链路的信号质量很差。远端设备(Remote UE)还可以称为远端UE或远端终端。下述均以Remote UE称之。
中继设备是在具有相同接口和相同介质访问控制协议的同构网段互联时中间加入的仪器设备。中继设备能够对传输的信号进行放大并可重发。中继设备具有中继功能，中继是指基站和UE之间不直接将信号发送给彼此，而是通过中继设备，经过信号放大或再生处理进行转发。中继设备(Relay UE)还可以称为中继UE或中继终端。下述均以Relay UE称之。
在Rel-13 ProSe(Proximity-Based Services，基于邻近的服务，适地服务)中，3GPP引入了基于层3中继的UE-to-network(设备到网络)中继功能，即远端UE通过中继UE接入网络，中继UE承担IP层中继的功能，在远端UE和网络间传递数据，而远端UE和中继UE通过侧行链路相连。
具体的连接建立步骤如图5所示，在步骤1中，E-UTRAN(Evolved Universal Mobile Telecommunications System Terrestrial Radio Access Network，演进的通用移动通信系统陆地无线接入网)初始连接和/或UE请求的PDN(Public Data Network，公用数据网)连接(E-UTRAN intial attach and/or UE requested pdn connectivity)。
在步骤2中，发现程序(Discovery Procedure)。在该步骤2中，该发现程序可以采用模型A或模型B。
在步骤3中，建立一对一通信的连接(establishment of connection for one-to-one communication)。中继UE可以建立一个新的用于中继的PDN连接(Eelay UE may establish aa new PDN connection for Relay)。
在步骤4中，地址/前缀分配(address/prefix allocation)。
在步骤5和步骤6中，远端UE上报(Remote UE Report)。其中，中继UE向网络上报远端UE的ID(Identification，身份证明)，以及IP(Internet Protocol，网际互连协议)信息，根据此上报消息，网络获知中继UE和远端UE的关联关系，从而进行相应的承载/会话管理以及配置，从而使得远端UE通过中继UE连接到网络，完成中继通信流(relayed traffic)。
在Rel-15 FeD2D(Future Enhancements to Long Term Evolution Divice to Divice，长期演进的设备到设备的未来增强)中，3GPP研究了基于层2中继的UE-to-network中继功能，即远端UE通过中继UE接入网络，中继UE承担适应层中继(无线链路层控制协议(Radio Link Control，RLC)层之上，分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层之下)的功能，在远端UE和网络间传递数据，而远端UE和中继UE通过侧行链路相连。
在侧行中继技术应用于NTN场景的情况下，透明转发的卫星网络架构可以如图6所示。再生转发的卫星网络架构可以如图7所示。如图6和图7所示，该中继UE与卫星连接，该卫星与地面的网络设备连接，该网络设备与数据网络连接，这样该中继UE通过NTN接入数据网络。远端UE与中继UE建立起连接，即可通过中继UE接入数据网络。例如，在一个具体示例中，在5G场景中，UE可以经基于透明转发或再生转发的NTN的NG-RAN连接到5GCN。5G场景的卫星网络架构可以如图8和图9所示，图8示出了5G场景中透明转发的卫星网络架构，图9示出了5G场景中再生转发的卫星网络架构。
对于远端设备(Remote UE)和中继设备(Relay UE)，UE-to-Network Relay能够增强覆盖及终端节能。如图10中(a)、(b)、(c)所示，UE-to-Network Relay可以包括三种覆盖场景，该三种覆盖场景以地面通信网络中UE通过连接基站以接入网络的方式为例。如图(a)所示，UE-to-Network的Relay UE在基站的覆盖范围内。Remote UE不在该基站的覆盖范围内，也即是在该基站的覆盖范围外。如图(b)所示，UE-to-Network的Relay UE和Remote UE都在一个基站的覆盖范围内。如图(c)所示，UE-to-Network的Relay UE和Remote UE在不同的小区内。
以Rel-17的UE-to-Network Relay为例，Relay UE和gNB(next Generation NodeB，下一代基站)之间采用NR(New Radio)Uu接口，Relay UE和Remote UE之间的侧行链路采用PC5接口。不考虑跨RAT的UE(Remote UE或Relay UE)配置、控制，即eNB/ng-eNB不能控制、配置NR的Remote UE和Relay UE。对于UE-to-Network Relay，Remote UE和数据网络之间采用单播(unicast)数据传输。在Relay UE和Remote UE之间建立PC5-RRC连接后，可以实现Remote UE和数据网络之间的单播数据中继。
当通过PC5接口建立连接后，Relay UE和Remote UE的Uu RRC状态可以发生改变。Relay UE和Remote UE在任何RRC状态下都能执行中继发现(relay discovery)。当Remote UE不在Uu覆盖范围内时，Remote UE可以执行中继发现。Relay UE必须在RRC_CONNECTED态才能执行单播数据的中继。
中继选择是指远端设备选择中继设备以接入的过程。中继重选是指远端设备当前已连接有中继设备，在达到触发条件时重新选择中继设备以接入的过程。该中继选择和中继重选为中继确定的过程，也即是远端设备确定要接入的中继设备的过程。下面通过图11所示实施例对中继确定方法的流程进行详细描述。
图11示出了本申请一个示例性实施例提供的中继确定方法的流程图，该方法由远端设备执行，该方法包括：
步骤1101：根据候选中继设备的网络接入方式进行中继选择或中继重选；其中，网络接入方式包括NTN接入或地面接入。
NTN接入是指非地面通信网络接入。地面接入是指地面通信网络(Terrestrial Communications Network，TCN)接入。
不同的网络接入方式所涉及的网元可能不同，例如，NTN接入可以采用卫星通信方式接入，其所涉及的网元可以包括卫星和地面的网络设备。中继设备与卫星连接，该卫星与地面上接入了数据网络的网络设备连接。这样中继设备通过卫星与数据网络进行数据交互。地面通信网络接入可以采用基站接入，其所涉及的网元可以包括基站，中继设备与基站连接，通过基站能够与数据网络进行数据交互。
可以理解地，地面接入中，UE直接与基站连接。NTN接入中，UE与基站中需借助卫星的信号转发功能实现数据交互，且UE与卫星之间以及卫星与地面的网络设备之间距离过大，这必然会导致NTN接入的数据传输速度比地面接入的数据传输速度要小，NTN接入时UE与数据网络之间数据传输的延迟会比地面接入时的延迟大。
结合上述不同网络接入方式中数据传输时延不同，在中继选择或中继重选时，考虑到了候选中继设备的网络接入方式，远端设备获知候选中继设备的网络接入方式，并将此作为中继选择或中继重选的依据，能够选择一个传输时延比较小的候选中继设备，接入到更好的小区，提高了远端设备接入的小区的通信服务质量，避免了远端设备在未知候选中继设备的网络接入方式的情况下，选择了通过卫星与地面基站连接的候选中继设备，从而接入的小区的通信服务质量较差，无法满足该远端设备的一些业务需求。尤其是该远端设备的一些时延敏感业务，比如该时延敏感业务可以为即时通信业务、音视频直播业务等。
在一些实施例中，候选中继设备的网络接入方式由候选中继设备的发现消息(Discovery Message)携带。该发现消息的发送可以包括两种模式，也即是指UE-to-Network Relay支持Model(模型)A和Model B两种发现模型。在Model A中，候选中继设备可以发送发现消息。远端设备接收到候选中继设备的发现消息，可以进行中继选择或中继重选。在Model B中，远端设备可以发送发现消息，候选中继设备和远端设备也可以发送发现消息。远端设备可以发送发现消息，候选中继设备接收到远端设备的发现消息后，可以发送发现消息。在远端设备接收到候选中继设备的发现消息的情况下，可以进行中继选择。
通过在候选中继设备的发现消息中携带其网络接入方式，能够使得远端设备接收到发送消息后，明确获知该候选中继设备的网络接入方式，进而能够基于该网络接入方式选择合适的候选中继设备，以满足自己的业务需求。该发现消息为中继选择或中继重选过程中的基本消息，通过在发现消息中携带网络接入方式，可以在无需对原有发现机制进行大量修改即可实现网络接入方式的告知，实现方式简单、易于配置，实用性好。
发现消息的协议栈如图12所示。假设远端设备和中继设备分别为UE A和UE B，UE A和UE B均可以在高层的触发时发送发现消息。该发现消息的发送可以由UE中的无线资源控制(Radio Resource Control，RRC)层支持，该RRC层用于支持系统消息、准入控制、安全管理、测量与上报、切换和移动性、NAS消息传输、无线资源管理。RRC层的下层为分别为分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层、无线链路层控制协议(Radio Link Control，RLC)层、介质访问控制(Media Access Control，MAC)层和物理(Physical，PHY)层。PDCP层用于传输用户面和控制面数据、维护PDCP的SN号、路由和重复(双连接场景)、加密/解密和完整性保护、重排序、支持乱序递交、重复丢弃、ROHC(用户面)。RLC层用于检错、纠错ARQ(AM实体)；分段重组(UM实体和AM实体)；重分段(AM实体)；重复包检测(AM实体)。MAC层用于逻辑信道和传输信道之间的映射、复用/解复用、调度、HARQ、逻辑信道优先级设置。物理层为高层的数据提供无线资源及物理层的处理。该高层是指物理层以上的层。
Relay UE可以具有以下与发现消息发送相关的特点。
特点1、当处于RRC_IDLE或RRC_INACTIVE状态时，如果基站提供有最小和最大Uu信号强度 阈值，Relay UE在最小和最大Uu信号强度阈值内发送发现消息。如果基站并未提供该最小和最大Uu信号强度阈值，Relay UE可以基于预配置发送发现消息。根据接入网络的不同，该基站可以不同。例如，在3G网络环境中，基站为NB。在4G网络环境中，基站为eNB。在5G网络环境中，基站为gNB。
特点2、Relay UE被允许在所有RRC状态下，根据基站提供的侧行链路通信配置发送发现消息。
特点3、基于层3中继的UE-to-network Relay的Relay UE，在连接到不具备侧行链路中继(Sidelink Relay)操作能力的基站时，如果其服务载波不与侧行链路(Sidelink)的载波共享，则允许至少基于预配置(pre-configuration)发送发现消息。
特点4、基于层2中继的UE-to-network Relay的Relay UE应始终连接到能够进行Sidelink Relay操作的基站，该基站应当能提供发现消息传输的配置。
Remote UE可以具有以下与发现消息发送相关的特点。
特点1、当服务小区测量到的信号强度低于配置的阈值时，允许处于RRC_IDLE和RRC_INACTIVE状态的Remote UE发送发现消息。
特点2、RRC_CONNECTED状态的Remote UE是否允许发送发现消息取决于服务基站提供的配置。服务基站提供的配置细节需要进一步讨论。
特点3、Remote UE在RRC_IDLE或RRC_INACTIVE态中进行Uu测量不需要额外的网络配置。
特点4、不在基站的覆盖范围内的Remote UE，在尚未通过Relay UE连接到网络的情况下，总是允许基于预配置传输发现消息。
特点5、支持UE-to-network Relay的Remote UE在直接连接到不具备Sidelink Relay操作的基站时，如果其服务载波不与Sidelink载波共享，则允许至少基于预配置发送发现消息。
特点6、对于基于层3中继的UE-to-network Relay的Remote UE，如果Remote UE不在基站的覆盖范围内，并且间接连接到基站，服务基站不可能提供无线电配置来发送发现消息。
特点7、对于基于层2中继的UE-to-network Relay的Remote UE，如果Remote UE不在基站的覆盖范围内，并且间接连接到基站，允许或不允许根据基站提供的配置发送发现消息。
上述内容已针对候选中继设备的网络接入方式可以在发送消息中携带的情况进行了说明。在一些实施例中，候选中继设备的网络接入方式通过第一指示信息、第二指示信息、第一通信链路的时延信息、第三指示信息或第四指示信息中的至少一种信息指示。下面针对这几种信息进行说明。
其中，第一指示信息用于指示第一通信链路是否通过NTN接入，第一通信链路为候选中继设备与基站之间的通信链路。也即是，该第一指示信息用于指示第一通信链路是通过NTN接入，还是通过地面接入。可以理解地，在第一指示信息指示第一通信链路通过NTN接入的情况下，该候选中继设备的网络接入方式为NTN接入。在第一指示信息指示第一通信链路不是通过NTN接入的情况下，或者在第一指示信息指示第一通信链路通过地面接入的情况下，该候选中继设备的网络接入方式为地面接入。
第一通信链路可以是Uu链路，也即是候选中继设备与基站之间基于Uu接口实现通信。在通信的5G NR系统中，UE通过Uu接口接入到5G NR系统的gNB，Uu接口是5G NR系统中最重要的开放接口。
可选地，该第一指示信息可以用0或1来表示。该第一指示信息为0或1，分别用于表示NTN接入或地面接入。比如，第一指示信息为0，该第一指示信息用于指示第一通信链路通过NTN接入。第一指示信息为1，该第一指示信息用于指示第一通信链路通过地面接入。当然，还可以反过来设置，比如，第一指示信息为0，该第一指示信息用于指示第一通信链路通过地面接入。第一指示信息为1，该第一指示信息用于指示第一通信链路通过NTN接入。该第一指示信息是否通过0或1表示，以及该第一指示信息的取值与所指示的内容均可以由相关技术人员根据需求进行设置，本申请实施例对此不作限定。
可选地，该第一指示信息可以为1bit(比特)的信息。可选地，该第一指示信息的信息量也可以不是1bit，而是其他数值，本申请实施例对此不作限定。
第二指示信息用于指示第一通信链路的NTN类型。该NTN类型可以根据第一通信链路所连接的卫星的类型确定。例如，NTN类型可以包括GEO、LEO、或高空平台(High Altitude Platform Station，HAPS)。又例如，该NTN类型除了GEO、LEO、HAPS之外，还可以包括MEO和HEO，或者其他类型，本申请实施例对该NTN类型包括哪几种类型不作具体限定。
可以理解地，如果候选中继设备的网络接入方式通过该第二指示信息指示，则该候选中继设备的网络接入方式为NTN接入。该第二指示信息不仅说明该候选中继设备通过NTN接入，还能够说明该候选中继设备接入的卫星是哪种类型。
可选地，该第二指示信息可以约为2bit(比特)的信息。可选地，该第一指示信息的信息量也可以不是2bit，而是其他数值，本申请实施例对此不作限定。
第一通信链路的时延信息用于表示该第一通信链路的时延，也即是可以表示该第一通信链路的信号质量。一般地，NTN接入的第一通信链路的时延要大于地面接入的第一通信链路的时延。可以设置一个第一门限，来为不同网络接入方式的时延信息进行划分。在时延信息大于第一门限的情况下，候选中继设备的网络接入方式为NTN接入。在时延信息小于或等于第一门限的情况下，候选中继设备的网络接入方式为地面接入。
该第一门限可以为预配置的，也可以为基站配置的，还可以为根据远端设备的类型确定的，还可以为根据远端设备注册的业务类型确定的。在本申请实施例中不对该第一门限的取值进行限定，也不对其配置或确定方式进行限定。
可选地，该第一通信链路的时延信息可以采用量化后的不同时延等级。例如，可以设置不同的时延范围，不同的时延范围对应不同的时延等级。通过第一通信链路的时延落在哪个时延范围内，可以判断该第一通信链路的时延等级。该时延等级的数量可以为两个或两个以上，本申请实施例对此不作限定。在信令传输时携带量化后的时延等级，相较于携带未量化的时延，能够更好地减少占用信令开销。
第三指示信息用于指示第一通信链路的NTN小区的小区类型。该NTN小区的小区类型可以包括地球固定类型和地球移动类型。在一个具体的可能实施例中，地球固定类型用earth fixed cell表示，地球移动类型用earth moving cell表示。
对于第一通信链路的NTN小区的小区类型为地球固定类型(earth fixed cell)，是指候选中继设备接入的卫星为GEO，该GEO与地球的旋转同步，GEO为地面提供服务的小区范围可以固定不变，因而将GEO的服务小区称为地球固定类型(earth fixed cell)。
对于第一通信链路的NTN小区的小区类型为地球移动类型(earth moving cell)，是指候选中继设备接入的卫星并非GEO，该卫星与地球的旋转不同步，每隔一定周期，该卫星为地面提供服务的小区范围发生改变，因而称之为地球移动类型(earth moving cell)。
第四指示信息用于指示第一通信链路的NTN小区的剩余小区服务时间或小区服务停止时刻。第四指示信息可以用cell leaving time表示。该剩余小区服务时间表示的为一段时间，也即是该NTN小区还能提供多久的服务。例如，该剩余小区服务时间为5分钟(min)。小区服务停止时刻表示的为某个时间点，也即是NTN小区在什么时刻停止服务。例如，该小区服务停止时刻为今天15：00，用于表示NTN小区在今天15:00停止服务。该小区服务停止时刻可以采用UTC(Universal Time Coordinated，协调世界时)，该UTC又称世界统一时间、世界标准时间、国际协调时间。该小区服务停止时刻还可以采用其他时间，比如，某个国际时区时间。本申请实施例对该小区服务停止时刻采用哪种时间不作限定。
除了上述至少一种信息来指示网络接入方式的情况之外，还有一种情况：候选中继设备的发现消息中并不携带有上述任一种信息，可以理解其网络接入方式为地面接入。
通过上述至少一种信息指示网络接入方式的方式，指示方式灵活、直观，能够明确地告知将候选中继设备的网络接入方式告知远端设备，在一些情况中，还能够将候选中继设备更多的信息告知远端设备，以便于远端设备进行中继选择时能够选择更好的候选中继设备，以提高通信服务质量。
在一些实施例中，该候选中继设备的网络接入方式通过上述至少一种信息指示，相应地，该候选中继设备的网络接入方式可以基于候选中继设备的发现消息携带的上述至少一种信息确定。具体地，如图13所示，该候选中继设备的网络接入方式的确定过程可以通过下述步骤1301至步骤1303确定。
步骤1301：候选中继设备发送发现消息。
步骤1302：远端设备接收该候选中继设备的发现消息。
步骤1303：远端设备根据该发现消息携带的信息确定该候选中继设备的网络接入方式。
下面提供几种候选中继设备的网络接入方式的确定方式，本申请实施例对具体采用哪种确定方式不作限定。下述几种确定方式的先后关系不限，可以采用下述几种确定方式中的至少一种。
确定方式一、在候选中继设备的发现消息携带有第一指示信息，且第一指示信息为0的情况下，确定候选中继设备的网络接入方式为NTN接入；在候选中继设备的发现消息携带有第一指示信息，且第一指示信息为1的情况下，确定候选中继设备的网络接入方式为地面接入。
确定方式二、在候选中继设备的发现消息携带有第一指示信息，且第一指示信息为0的情况下，确定候选中继设备的网络接入方式为地面接入；在候选中继设备的发现消息携带有第一指示信息，且第一指示信息为1的情况下，确定候选中继设备的网络接入方式为NTN接入。
该确定方式一和确定方式二为发现消息携带有第一指示信息，第一指示信息为0或1的情况。在该确定方式一和确定方式二中，该候选中继设备的网络接入方式通过第一指示信息指示。在介绍第一指示信息时也已经说明，该第一指示信息是否通过0或1表示，以及该第一指示信息的取值与所指示的内容均可以由相关技术人员根据需求进行设置，比如，该第一指示信息也可以通过1或2表示，本申请实施例对此不作限定。
确定方式三、在候选中继设备的发现消息携带有第二指示信息、第三指示消息、第四指示信息中的任一项的情况下，确定候选中继设备的网络接入方式为NTN接入。
在该确定方式三中，发现消息携带有第二指示信息、第三指示消息、第四指示信息中的任一项包括以下几种情况：
情况一、发现消息携带有三种信息中的一种：携带第二指示信息、携带有第三指示消息、携带有第四指示消息。
情况二、发现消息携带有三种信息中的两种：携带有第二指示信息和第三指示信息、携带有第二指示信息和第四指示信息、携带有第三指示信息和第四指示信息。
情况三、发现消息携带有三种信息：携带有第二指示信息、第三指示消息和第四指示信息。
第二指示信息、第三指示消息、第四指示信息均进一步指示有NTN小区的相关情况，如果候选中继设备的发现消息携带有第二指示信息、第三指示消息、第四指示信息中的任一项，也就说明该候选中继设备的网络接入方式为NTN接入。进一步地，根据该发现消息携带的信息不同，还能够从发现消息中进一步确定该候选中继设备的NTN小区的相关情况，比如NTN类型、NTN小区的小区类型、NTN小区的剩余小区服务时间或小区服务停止时刻等。
确定方式四、在候选中继设备的发现消息携带有第一通信链路的时延信息，且时延信息大于第一门限的情况下，确定候选中继设备的网络接入方式为NTN接入，第一通信链路为候选中继设备与基站之间的通信链路。
确定方式五、在候选中继设备的发现消息携带有第一通信链路的时延信息，且时延信息小于或等于第一门限的情况下，候选中继设备的网络接入方式为地面接入。
在该确定方式四和确定方式五中，通过第一通信链路的时延信息与第一门限的大小关系，能够区分NTN接入和地面接入。NTN接入的第一通信链路的时延信息大于第一门限，地面接入的第一通信链路的时延信息小于或等于第一门限。
确定方式六、在候选中继设备的发现消息未携带有第一指示信息、第二指示信息、第一通信链路的时延信息、第三指示信息和第四指示信息中的任一项的情况下，确定候选中继设备的网络接入方式为地面接入。
在确定方式六中，候选中继设备的发现消息中并未携带上述任一种信息，可以理解其为地面接入的候选中继设备。NTN接入的候选中继设备的发现消息中会通过携带上述信息来指示其是通过NTN接入的。也即是，如果候选中继设备与基站的第一通信链路时通过NTN建立的连接，其发现消息中额外包括上述五种信息中的一种或多种。
上述内容已经针对候选中继设备的网络接入方式的指示方式和确定方式进行了重点说明。通过候选中继设备的网络接入方式，远端设备能够获知该候选中继设备是通过NTN接入网络，还是通过地面接入网络。可以理解地，地面接入的候选中继设备与网络之间的时延比较小，远端设备在根据候选中继设备的网络接入方式进行中继选择或中继重选时，可以优先选择网络接入方式为地面接入的候选中继设备。
在一些实施例中，在进行中继选择和中继重选时，除了候选中继设备的网络接入方式之外，远端设备还可以考虑中继选择准则进行中继选择或中继重选。如图14所示，该中继确定方法包括：
步骤1401：根据中继选择准则和候选中继设备的网络接入方式，进行中继选择或中继重选。
其中，中继选择准则包括第一准则或第二准则中的至少一项。也即是，该中继选择准则包括第一准则。或者，该中继选择准则包括第二准则。或者，该中继选择准则包括第一准则和第二准则。
第一准则包括远端设备与候选中继设备之间的第二通信链路的信号质量满足第一条件。
该第二通信链路为远端设备与候选中继设备之间的通信链路，为UE之间的直连通信链路。该第一准则可以称之AS(Access Stratum，接入层)的准则。
在一些实施例中，该第二通信链路可以为PC5链路，PC5链路即为一种直连链路。也即是，远端设备与候选中继设备之间通过PC5接口进行通信。该远端设备与候选中继设备之间的链路可以称为侧行链路，该侧行链路采用PC5接口。该第二通信链路的信号质量即为PC5链路的信号质量，确定PC5链路的信号质量的过程即为PC5接口的测量过程。
该PC5接口的测量过程或者确定PC5链路的信号质量的过程可以通过多种方式实现。
在一些实施例中，在中继选择和中继重选时，远端设备可以使用Sidelink发现消息的无线电信号强度测量来评估候选中继设备的PC5链路的信号质量。具体地，远端设备可以获取候选中继设备的发现消息的无线电信号强度，将该无线电信号强度作为该候选中继设备的PC5链路的信号质量。
在中继重选时，远端设备与一个中继设备已连接，在确定该中继设备的PC5链路的信号质量时，可以使用Sidelink单播链路的SL-RSRP(Sidelink-Reference Signal Receiving Power，侧行链路的参考信 号接收功率)测量的方式来评估该中继设备的PC5链路的信号质量。具体地，远端设备可以获取与已连接的中继设备的侧行链路上的参考信号接收功率。其中，如果Remote UE与Relay UE有PC5-RRC连接，如何基于SL-RSRP和/或发现消息的RSRP进行RSRP测量需要进一步讨论决定。如果在Sidelink单播链路上没有传输，PC5链路的信号质量的测量准则需要进一步讨论，本申请实施例在此不作过多赘述。
在一些实施例中，该第二通信链路的信号质量满足第一条件可以为第二通信链路的信号质量大于某个门限值，或者可以为与最好的信号质量之差在门限范围内。该第一条件可以为预配置的，也可以为基站预配置的，也可以为根据远端设备的类型确定的，或者为根据远端设备注册的业务类型确定的。本申请实施例对该第一条件不作限定。
第二准则是候选中继设备满足高层准则。
该高层准则可以是指该候选中继设备的高层满足第二条件，该第二条件可以由相关技术人员根据需求进行设置，本申请实施例对此不作限定。
可选地，上述第一准则为接入层的准则，该第二准则为非接入层的准则。
例如，该第二准则可以包括基于PLMN(Public Land Mobile Network,公共陆地移动网络)的Relay选择准则。基于该PLMN(Public Land Mobile Network,公共陆地移动网络)的Relay选择准则进行中继选择时包括PLMN选择过程和Relay选择过程。
在PLMN选择过程中，远端设备接收一个或多个PLMN，然后检查这些PLMN是否被授权用于ProSe场景，以确定可用的PLMN，远端设备根据配置从可用的PLMN中选择一个PLMN。
其中，该选择的一个PLMN为NAS(Non-Access Stratum，非接入层)层所选的PLMN。可以理解地，一个候选中继设备支持的PLMN的数量为一个或多个，候选中继设备的数量为一个或多个。
在中继选择过程中，远端设备根据NAS(Non-Access Stratum，非接入层)层所选的PLMN，选择支持该PLMN的候选中继设备。
在此仅提供了一个基于PLMN进行中继选择的高层准则的示例，该高层准则还可以包括其他准则，本申请实施例在此不一一列举，也对此不作限定。
在这些实施例中，中继选择或中继重选的过程综合考虑了中继选择准则和候选中继设备的网络接入方式，远端设备能够选择出既符合中继选择准则，通过网络接入方式确定接入的小区服务质量又高的候选中继设备，相较于基于单个因素进行中继选择的方式，中继选择或重选时考虑得更加全面，选择的结果也就更好。
在一些实施例中，在存在候选中继设备的网络接入方式为NTN接入的情况下，远端设备根据候选中继设备的网络接入方式进行中继选择或中继重选，或者，根据候选中继设备的网络接入方式和中继选择准则进行中继选择或中继重选。在所有候选中继设备的网络接入方式均为地面接入的情况下，远端设备根据中继选择准则进行中继选择或中继重选。
中继选择和中继重选的触发条件和具体确定过程可能相同，也可能不同。下面针对中继选择和中继重选分别进行说明。
在此对中继选择的触发条件进行说明。中继选择的触发条件可以为下述两种触发方式中的任一种。
触发方式一、远端设备的直接通信链路的信号质量低于第一阈值。
该远端设备可能处于小区内，该远端设备可以与该小区的基站连接，以接入网络。在此称该远端设备与基站之间的通信链路为该远端设备的直接通信链路。可以理解地，该直接通信链路的信号质量直接影响到该远端设备的数据服务质量。如果远端设备的直接通信链路的信号质量低于第一阈值，说明该远端设备当前的数据服务质量比较差，可以通过中继选择的方式为其提供更好的数据服务，因而可以触发中继选择。
该第一阈值可以为预配置的，也可以为基站预配置的，也可以为根据远端设备的类型确定的，或者为根据远端设备注册的业务类型确定的。本申请实施例对该第一阈值的取值和确定方式不作限定。
触发方式二、远端设备的高层触发。
该高层是指物理层以上的层。远端设备的高层在满足一定条件时会指示进行中继选择。比如，该远端设备可能在覆盖范围之外，无法接入到网络，则这高层触发中继选择，以通过中继设备接入网络。又比如，该远端设备开启了时延敏感业务或数据量较大的业务等，当前的直接通信链路并不能支持，高层可以触发中继选择。
通过上述触发条件触发中继选择后，该远端设备可以根据候选中继设备的网络接入方式进行中继选择。在根据中继选择准则和中继设备的网络接入方式，进行中继选择时，可以通过中继选择准则对候选中继设备进行了一步筛选，然后再基于网络接入方式进行中继选择，从而完成了二次筛选，能够通过该筛选过程选择到更合适的候选中继设备，以保证接入的小区的服务质量。
在进行中继选择时，可以通过逐个选择的方式，也可以通过集中选择的方式。在逐个选择方式中，每次确定出一个中继设备，然后对该中继设备进行中继选择，以确定是否接入该候选中继设备。需要说明的是，该确定出一个中继设备是指确定且仅确定一个中继设备。在集中选择方式中，先将所有满足中继选择准则的候选中继设备确定出来，也即得到一个满足中继选择准则的第一候选中继设备集合，再在第一候选中继设备集合中进行进一步选择。需要说明的是，集中选择方式确定出的第一候选中继设备集合中候选设备的数量可以为一个或多个，第一候选中继设备集合仅包含一个候选中继设备的情况下，也会按照集中选择方式进行处理，具体可以参见下述集中选择方式的内容。
下面分别对两种方式进行说明。
如图15所示，示出了一种逐个选择方式的流程。该流程包括步骤1501和步骤1502。
步骤1501：确定满足中继选择准则的一个候选中继设备。
步骤1502：基于候选中继设备的网络接入方式进行中继选择。
逐个选择方式是指一次确定出一个候选中继设备，然后基于该候选中继设备的网络接入方式，对该候选中继设备进行中继选择。如果远端设备选择了本次确定出的候选中继设备，则可以停止确定候选中继设备和中继选择的过程，也即是无需再发现新的候选中继设备。如果远端设备放弃接入本次确定出的候选中继设备，则可以继续发现候选中继设备，下次再确定出一个候选中继设备时，可以再进行中继选择。
具体地，中继选择的过程可以为下述多种情况中任一种情况。
情况一、在候选中继设备的网络接入方式是地面接入的情况下，选择候选中继设备；在候选中继设备的网络接入方式为NTN接入的情况下，放弃接入候选中继设备。
在情况一中，NTN接入的第一通信链路的时延要大于地面接入的第一通信链路的时延。在中继选择时，优先选择地面接入的候选中继设备。因而，在确定候选中继设备的网络接入方式是地面接入时，可以选择该候选中继设备。否则，放弃接入该候选中继设备。放弃接入后，远端设备可以再继续发现其他的候选中继设备。
在一个具体的可能实施例中，该候选中继设备的发现消息携带有第一指示信息。远端设备根据第一指示信息确定为地面接入时，选择该候选中继设备。远端设备根据第一指示信息确定为NTN接入时，放弃接入该候选中继设备。
情况二、在候选中继设备的第一通信链路的时延信息小于或等于第一门限的情况下，选择候选中继设备，第一通信链路为候选中继设备与基站之间的通信链路；在候选中继设备的第一通信链路的时延信息大于第一门限的情况下，放弃接入候选中继设备。
在情况二中，第一通信链路的时延信息小于或等于第一门限，则说明该候选中继设备的网络接入方式为地面接入。候选中继设备的第一通信链路的时延信息大于第一门限，则说明该候选中继设备的网络接入方式为NTN接入。NTN接入的第一通信链路的时延要大于地面接入的第一通信链路的时延。在中继选择时，优先选择地面接入的候选中继设备。因而，在确定候选中继设备的网络接入方式是地面接入时，可以选择该候选中继设备。否则，放弃接入该候选中继设备。放弃接入后，远端设备可以再继续发现其他的候选中继设备。
或者换一种表述，第一通信链路的时延信息小于或等于第一门限，说明该候选中继设备的第一通信链路的信号质量比较好，时延很小，接入该候选中继设备的话能够获得较高的小区服务质量，因而可以选择接入。相反的，候选中继设备的第一通信链路的时延信息大于第一门限，说明该候选中继设备的第一通信链路的信号质量不太好，时延比较大，接入该候选中继设备的话能够获得较低的小区服务质量，因而可以放弃接入，再发现其他的候选中继设备。
在一个具体的可能实施例中，该候选中继设备的发现消息携带有第一通信链路的时延信息。远端设备根据第一通信链路的时延信息与第一门限的大小关系，确定是否选择该候选中继设备。
情况三、在候选中继设备的NTN小区的小区类型为地球固定类型的情况下，选择候选中继设备；在候选中继设备的网络接入方式为地球移动类型的情况下，放弃接入候选中继设备。
在情况三中，地球固定类型相较于地球移动类型，能够提供信号质量更好、更加稳定的小区服务。因而，在中继选择时，优先选择小区类型为地球固定类型的候选中继设备。
在一个具体的可能实施例中，该候选中继设备的发现消息携带有第三指示信息。远端设备根据第三指示信息，确定NTN小区的小区类型为地球固定类型时，选择该候选中继设备。远端设备根据第三指示信息，确定NTN小区的小区类型为地球移动类型时，放弃接入该候选中继设备。
情况四、在候选中继设备的NTN小区的剩余小区服务时间大于或等于第二门限的情况下，选择候选中继设备；在候选中继设备的NTN小区的剩余小区服务时间小于第二门限的情况下，放弃接入候选中继设备。
在情况四中，剩余小区服务时间能够表示该候选中继设备还能提供多长时间的小区服务。可以理解地，为了能够保证业务处理过程不会突然中断，远端设备可以选择剩余小区服务时间大于或等于第二门限的候选中继设备，以保证业务能够正常进行。
第二门限可以为预配置的，也可以为基站配置的，还可以为根据远端设备的类型确定的，还可以为根据远端设备注册的业务类型确定的。本申请实施例对第二门限的取值和确定方式不作具体限定。
剩余小区服务时间大于或等于第二门限，可以认为候选中继设备能够提供足够时间的服务，保证业务的正常进行。剩余小区服务时间小于第二门限，可以认为候选中继设备的服务时间太短，业务处理中途可能会因候选中继设备的服务时间停止而导致中断。
在一个具体的可能实施例中，该候选中继设备的发现消息携带有第四指示信息。远端设备根据第四指示信息与第二门限的大小关系，确定是否选择该候选中继设备。该第四指示信息采用了剩余小区服务时间的形式。
情况五、在候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限的情况下，选择候选中继设备；在候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值小于第二门限的情况下，放弃接入候选中继设备。
在情况五中，小区服务停止时刻其实也可以用来确定候选中继设备能够提供多久的服务。小区服务停止时刻与系统时间的差值即为上述剩余小区服务时间。
在另一些实施例中，远端设备还可以对小区服务停止时刻与远端设备的业务结束时刻进行比较，在小区服务停止时刻在业务结束时刻之后的情况下，选择该候选中继设备。在小区服务停止时刻在业务结束时刻之前的情况下，放弃接入候选中继设备。
在一个具体的可能实施例中，该候选中继设备的发现消息携带有第四指示信息。远端设备根据第四指示信息与系统时间的差值与第二门限的大小关系，确定是否选择该候选中继设备。该第四指示信息采用了小区服务停止时刻的形式。
上述仅提供了可能的五种情况，但不限定仅包括上述五种情况，该中继选择的过程还可以按照其他情况进行。比如，在一种情况中，在候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值小于或等于第三门限的情况下，选择该候选中继设备。否则，放弃接入该候选中继设备。在另一种情况下，在候选中继设备的NTN小区的剩余小区服务时间小于或等于第三门限的候选中继设备的情况下，选择该候选中继设备。否则，放弃接入该候选中继设备。
该第三门限可以为预配置的，也可以为基站配置的，还可以为根据远端设备的类型确定的，还可以为根据远端设备注册的业务类型确定的。本申请实施例对第三门限的取值和确定方式不作限定。
在这两种情况中，可能当前远端设备的业务为发送一次消息，并不需要候选中继设备的服务时间很多，因而，可以尽可能地选择剩余小区服务时间小的，以将剩余小区服务时间比较长的留给其他有需求的远端设备。
上述逐个选择方式其实质是逐个根据候选中继设备的网络接入方式，对候选中继设备进行中继选择，直至选择任一个候选中继设备时停止的过程，换一种方式进行表述的话，逐个选择方式中可能包括发现多次的情况，还有一种情况是在发现候选中继设备时，仅发现了一个候选中继设备。也即是，发现一次候选中继设备之后，后续并没有再发现其他候选中继设备。如果是仅发现一次候选中继设备的情况，远端设备按照上述五种情况中任一种情况进行处理即可。如果是发现多次的情况，还可以通过下述表述来对中继选择过程进行解释说明。
确定满足中继选择准则的第i个候选中继设备，在多个候选中继设备中第i个候选中继设备满足第三选择条件集合中的任一种选择条件的情况下，选择第i个候选中继设备，i为整数；在第i个候选中继设备不满足第三选择条件集合中的任一种选择条件的情况下，对满足中继选择准则的第i+1个候选中继设备进行中继选择。
其中，第三选择条件集合包括如下选择条件中的至少一种：
网络接入方式是地面接入；
第一通信链路的时延信息小于或等于第一门限，第一通信链路为第i个候选中继设备与基站之间的通信链路；
NTN小区的小区类型为地球固定类型；
NTN小区的剩余小区服务时间大于或等于第二门限；
NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限。
在集中选择方式中，可以直接将候选中继设备进行集中处理。先将满足的中继选择准则的候选中继设备都确定出来，确定出来的候选中继设备作为第一候选中继设备集合，再从确定出来的第一候选中继设备集合中进行中继选择。
具体地，该集中选择方式可以通过步骤一和步骤二实现。
步骤一：确定满足中继选择准则的第一候选中继设备集合。
步骤二：在第一候选中继设备集合中，基于候选中继设备的网络接入方式进行中继选择。
在步骤一中，远端设备可以先将所有满足中继选择准则的候选中继设备都确定出来，该确定步骤已将需要进一步基于网络接入方式进行中继选择的候选中继设备都筛选出来了。后续远端设备在步骤二即可在第一候选中继设备集合中进行选择即可，不再发现其他候选中继设备。这样将所有满足中继选择准则的候选中继设备集中确定出来，再从中按照网络接入方式优先选择最合适的候选中继设备，能够大大保证选择的候选中继设备的通信质量。
其中，该第一候选中继设备集合包括一个或多个候选中继设备。远端设备判断发现的候选中继设备是否满足中继选择准则，如果满足，则将其添加至第一候选中继设备集合中。如果不满足，则无需添加。
通过判断，远端设备可能会发现满足中继选择准则的有多个候选中继设备，则远端设备可以进一步基于集中选择方式对应的中继选择过程来确定接入候选中继设备。还有一种可能：远端设备可能会发现满足中继选择准则的只有一个候选中继设备，这样第一候选中继设备集合中则仅包含一个候选中继设备，远端设备也可以基于集中选择方式对应的中继选择过程来确定是否接入该候选中继设备。
该集中选择方式对应的中继选择过程可以为下述多种情况中任一种情况。
情况一、在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备。
情况二、在第一候选中继设备集合中，优先选择第一通信链路的时延信息小于或等于第一门限的候选中继设备，第一通信链路为候选中继设备与基站之间的通信链路。
情况三、在第一候选中继设备集合中，优先选择第一通信链路的时延信息最小的候选中继设备。
情况四、在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择网络接入方式为NTN接入且NTN小区的小区类型为地球固定类型的候选中继设备。
情况五、在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择网络接入方式为NTN接入且NTN小区的剩余小区服务时间大于或等于第二门限的候选中继设备。
情况六、在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择网络接入方式为NTN接入且NTN小区的剩余小区服务时间最大的候选中继设备。
情况七、在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择网络接入方式为NTN接入且NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限的候选中继设备。
情况八、在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择网络接入方式为NTN接入且NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
在该八种情况中，优先选择地面接入的候选中继设备，如果确定出来的第一候选中继设备集合中候选中继设备的网络接入方式均为NTN接入，则可以根据不同情况，按照其他因素进行次优先选择。
上述仅提供了可能的八种情况，但不限定仅包括上述八种情况，该中继选择的过程还可以按照其他情况进行。比如，在一种情况中，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择在候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值小于或等于第三门限的候选中继设备。在另一种情况下，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择候选中继设备的NTN小区的剩余小区服务时间小于或等于第三门限的候选中继设备的候选中继设备。在另一种情况下，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择候选中继设备的NTN小区的剩余小区服务时间最小的候选中继设备的候选中继设备。在另一种情况下，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择候选中继设备的NTN小区的剩余小区服务时间最小的候选中继设备的候选中继设备。在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备，次优先选择在候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值最小的候选中继设备。
该第三门限可以为预配置的，也可以为基站配置的，还可以为根据远端设备的类型确定的，还可以为根据远端设备注册的业务类型确定的。本申请实施例对第三门限的取值和确定方式不作限定。
在这四种情况中，可能当前远端设备的业务为发送一次消息，并不需要候选中继设备的服务时间很多，因而，可以尽可能地选择剩余小区服务时间小的，以将剩余小区服务时间比较长的留给其他有需求的远端设备。
需要说明的是，在第一候选中继设备集合包括多个候选中继设备的情况下，远端设备基于上述各个情况能够从多个候选中继设备中确定出更合适的候选中继设备。在第一候选中继设备集合仅包括一个 候选中继设备的情况下，远端设备也通过上述各个情况进行中继选择，只是在确定优先选择方案时，无需与其他候选中继设备进行对比，在此不多做赘述。
在一些实施例中，在上述中继选择过程中，除了候选中继设备的网络接入方式之外，远端设备还可以考虑自身特性。其中，远端设备的自身特性包括：远端设备的类型和注册的业务类型中的至少一种。
同理地，在进行中继选择时，可以通过逐个选择的方式，也可以通过集中选择的方式。在逐个选择方式中，每次基于中继选择准则确定出一个中继设备，然后再基于网络接入方式和远端设备的自身特性对该中继设备进行中继选择，以确定是否接入该候选中继设备。在集中选择方式中，先将所有满足中继选择准则的候选中继设备确定出来，也即得到一个满足中继选择准则的第一候选中继设备集合，再在第一候选中继设备集合中进行进一步选择。
下面分别对两种方式进行说明。
在逐个选择方式中，中继选择过程可以通过下述步骤1和步骤2实现。
步骤1：确定满足中继选择准则的一个候选中继设备。
步骤2：基于远端设备的自身特性和候选中继设备的网络接入方式进行中继选择。
该步骤1和不考虑远端设备自身特性的方式中的步骤1501同理，在此不多做赘述。
该步骤2与上述步骤1502的不同之处在于，除了该候选中继设备的网络接入方式，还考虑了远端设备的自身特性。
在结合自身特性和网络接入方式进行中继选择时，如果存在地面接入的候选中继设备，则选择地面接入的候选中继设备。如果不存在地面接入的候选中继设备，则在根据自身特性确定支持NTN接入时，可以选择NTN接入的候选中继设备。
逐个选择方式，是指一次确定出一个候选中继设备，然后基于该候选中继设备的网络接入方式，对该候选中继设备进行中继选择。如果远端设备选择了本次确定出的候选中继设备，则可以停止确定候选中继设备和中继选择的过程，也即是无需再发现新的候选中继设备。如果远端设备放弃接入本次确定出的候选中继设备，则可以继续发现候选中继设备，下次再确定出一个候选中继设备时，可以再进行中继选择。
具体地，中继选择的过程可以为下述多种情况中任一种情况。
情况一、在候选中继设备的网络接入方式为地面接入的情况下，选择候选中继设备。
情况二、在候选中继设备的网络接入方式为NTN接入的情况下，且远端设备的自身特性支持NTN接入的情况下，选择候选中继设备。
在情况二中，如果该远端设备的自身特性支持NTN接入，比如该远端设备所注册的业务类型不是时延敏感业务，或者该远端设备的设备类型支持NTN接入，则可以选择该候选中继设备以接入。
上述逐个选择方式其实质是逐个根据候选中继设备的网络接入方式和远端设备的自身特性，对候选中继设备进行中继选择，直至选择任一个候选中继设备时停止的过程，换一种方式进行表述的话，逐个选择方式中可能包括发现多次的情况，还有一种情况是在发现候选中继设备时，仅发现了一个候选中继设备。也即是，发现一次候选中继设备之后，后续并没有再发现其他候选中继设备。如果是仅发现一次候选中继设备的情况，远端设备按照上述五种情况中任一种情况进行处理即可。如果是发现多次的情况，还可以通过下述表述来对中继选择过程进行解释说明。
确定满足中继选择准则的第i个候选中继设备，在第i个候选中继设备满足第四选择条件集合中的任一种选择条件的情况下，选择第i个候选中继设备，i为整数；在第i个候选中继设备不满足第四选择条件集合中的任一种选择条件的情况下，对确定出的第i+1个候选中继设备进行中继选择。
其中，第四选择条件集合包括如下选择条件中的至少一项：
网络接入方式是地面接入；
第一通信链路的时延信息小于或等于第一门限，且远端设备的自身特性支持NTN接入，第一通信链路为第i个候选中继设备与基站之间的通信链路；
NTN小区的小区类型为地球固定类型，且远端设备的自身特性支持NTN接入；
NTN小区的剩余小区服务时间大于或等于第二门限，且远端设备的自身特性支持NTN接入；
NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限，且远端设备的自身特性支持NTN接入。
需要说明的是，与前面不考虑远端设备的自身特性的中继选择过程不同的是，在选择NTN接入的候选中继设备时均需要考虑远端设备的自身特性支持NTN接入。如果远端设备的自身特性不支持NTN接入，则远端设备则放弃接入NTN接入的候选中继设备。
在集中选择方式中，可以直接将候选中继设备进行集中处理。先将满足的中继选择准则的候选中继设备都确定出来，确定出来的候选中继设备作为第一候选中继设备集合，再从确定出来的第一候选中继 设备集合中进行中继选择。
具体地，该集中选择方式可以通过步骤A和步骤B实现。
步骤A：确定满足中继选择准则的第一候选中继设备集合。
步骤B：在第一候选中继设备集合中，基于远端设备的自身特性和候选中继设备的网络接入方式进行中继选择。
该步骤A与上述不考虑远端设备的自身特性的方式中步骤一同理，在此不多做赘述。
该步骤B与上述不考虑远端设备的自身特性的方式中步骤二相比，除了考虑候选中继设备的网络接入方式之外，还考虑了远端设备的自身特性。
其中，该第一候选中继设备集合包括一个或多个候选中继设备。远端设备判断发现的候选中继设备是否满足中继选择准则，如果满足，则将其添加至第一候选中继设备集合中。如果不满足，则无需添加。
通过判断，远端设备可能会发现满足中继选择准则的有多个候选中继设备，则远端设备可以进一步基于集中选择方式对应的中继选择过程来确定接入候选中继设备。还有一种可能：远端设备可能会发现满足中继选择准则的只有一个候选中继设备，这样第一候选中继设备集合中则仅包含一个候选中继设备，远端设备也可以基于集中选择方式对应的中继选择过程来确定是否接入该候选中继设备。
该集中选择该该集中选择方式对应的中继选择过程可以为：在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备；在远端设备的自身特性支持NTN接入的情况下，次优先选择满足第二选择条件集合中的任一种选择条件的候选中继设备。
其中，第二选择条件集合包括如下选择条件中的至少一种：
第一通信链路的时延信息小于或等于第一门限，第一通信链路为候选中继设备与基站之间的通信链路；
第一通信链路的时延信息最小；
NTN小区的小区类型为地球固定类型；
NTN小区的剩余小区服务时间大于或等于第二门限；
NTN小区的剩余小区服务时间最大；
NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限；
NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
下面针对上述中继选择过程提供五个具体示例，在该五个具体示例中，分别应用了上述中继选择时的任一种或多种情况中的方法步骤。
在下述示例中，将第一指示信息称为Relay UE与gNB之间的Uu链路是NTN接入的指示信息，将第二指示信息称为指示Relay UE的Uu链路的NTN接入类型(如GEO、LEO等)的指示信息，将第一通信链路的时延信息称为Relay UE的Uu链路的时延信息，将第三指示信息称为earth fixed/earth moving cell指示信息，将第四指示信息称为cell leaving time信息。
示例一：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路是NTN接入的指示信息，和/或指示Relay UE的Uu链路的NTN接入类型(如GEO、LEO等)的指示信息，和/或Relay UE的Uu链路的时延信息，和/或earth fixed/earth moving cell指示信息，和/或cell leaving time信息。Remote UE根据发现消息中的信息，执行中继选择，具体如下：
-Remote UE根据发现消息中携带的信息确认Relay UE与gNB之间的Uu链路是否通过NTN接入。确认方式为：如果发现消息中包含了Relay UE的上述信息，Remote UE认为Relay UE与gNB之间是NTN接入。
-如果Relay UE满足基于RSRP的接入层中继选择重选准则并且满足高层准则，且Uu链路不是通过NTN接入(也即是通过地面接入)，则Remote UE确定该Relay UE为所选择的Relay UE(也即是指选择接入该Relay UE)。
-如果Relay UE不满足基于RSRP的接入层中继选择重选准则，或者如果Relay UE不满足高层准则，或者，如果Uu链路是通过NTN接入，Remote UE确定该Relay UE为非所选择的Relay UE，即放弃该Relay UE。
示例二：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路的时延信息。Remote UE根据发现消息中的这一时延信息，执行中继选择，具体如下：
-如果Relay UE满足基于RSRP的接入层中继选择重选准则并且满足高层准则，且Uu链路的时延信息小于等于对应门限，则Remote UE确定该Relay UE为所选择的Relay UE。其中，该门限可以预配置或由gNB通过SIB/RRC消息提供，也可以由终端根据自身终端类型和/或注册的业务类型确定(类似 示例三)。
或者，Remote UE选择Uu链路时延最小的Relay UE作为所选择的Relay UE。
-如果Relay UE不满足基于RSRP的接入层中继选择重选准则，或者如果Relay UE不满足高层准则，或者如果Relay UE与gNB之间的Uu链路的时延信息小于等于对应门限，Remote UE该Relay UE为非所选择的Relay UE，即放弃该Relay UE。
示例三：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路是NTN接入的指示信息和/或指示Relay UE的Uu链路的NTN接入类型(如GEO、LEO等)的指示信息和/或Relay UE的Uu链路的时延信息和/或earth fixed/earth moving cell指示信息和/或cell leaving time信息。Remote UE根据发现消息中的上述信息，执行中继选择，具体如下：
-Remote UE结合自身特性或能力，如UE的终端类型、UE注册的业务类型等，确定是否支持该Relay UE的Uu链路的NTN接入类型；
-如果Relay UE满足基于RSRP的接入层中继选择重选准则并且满足高层准则，且Remote UE自身终端类型和/或注册的业务类型支持该Relay UE，则Remote UE确定该Relay UE为所选择的Relay UE。例如，如果Remote UE为该RedCap终端中的工业传感器类型终端，其业务对时延不敏感，适用于NTN传输，可以确定Remote UE自身终端类型和/或注册的业务类型支持该Relay UE。
-如果Relay UE不满足基于RSRP的接入层中继选择重选准则，或如果Relay UE不满足高层准则，或Remote UE自身终端类型和/或注册的业务类型不支持该Relay UE，则Remote UE确定该Relay UE为非所选择的Relay UE，即放弃该Relay UE。例如，eMBB(Enhanced Mobile Broadband，增强移动宽带)或wearable的业务类型包含语音等时延敏感业务，如果Remote UE所注册的业务类型为这类时延敏感业务，不适用于GEO等长时延的NTN传输，可以确定Remote UE自身终端类型和/或注册的业务类型不支持该Relay UE。
示例四：
Relay UE的发现消息中包括earth fixed/earth moving cell指示信息。Remote UE根据发现消息中的earth fixed/earth moving cell指示信息，执行中继选择，具体如下：
-如果Relay UE满足基于RSRP的接入层中继选择重选准则并且满足高层准则，且Relay UE的Uu链路的NTN cell是earth fixed cell，则Remote UE确定该Relay UE为所选择的Relay UE。
-如果Relay UE不满足基于RSRP的接入层中继选择重选准则，或者如果Relay UE不满足高层准则，或者Relay UE的Uu链路的NTN cell是earth moving cell，Remote UE确定该Relay UE为非所选择的Relay UE，即放弃该Relay UE。
示例五：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路的cell leaving time信息。Remote UE根据发现消息中的cell leaving time信息，执行中继选择，具体如下：
-如果Relay UE满足基于RSRP的接入层中继选择重选准则并且满足高层准则，且Uu链路的剩余小区服务时间大于等于对应门限，则Remote UE确定该Relay UE为所选择的Relay UE。其中，该门限可以预配置或由gNB通过SIB/RRC消息提供，也可以由终端根据自身终端类型和/或注册的业务类型确定(类似示例三)。
或者，Remote UE优先选择Uu链路的剩余小区服务时间较小的Relay UE作为所选择的Relay UE；
-如果Relay UE不满足基于RSRP的接入层中继选择重选准则，或者如果Relay UE不满足高层准则，或者如果Uu链路的剩余小区服务时间小于对应门限，Remote UE确定该Relay UE为非所选择的Relay UE，即放弃该Relay UE。
上述内容针对中继选择的过程进行了详细说明，下面针对中继重选的过程进行说明。中继重选与中继选择不同的是，当前远端设备已连接有一个中继设备，但基于下述触发条件，要再重新选择一个更好的候选中继设备。
在此对中继重选的触发条件进行说明。中继重选的触发条件可以为下述五种触发方式中的任一种。
触发条件一、远端设备与已连接的中继设备之间的第三通信链路的信号质量低于第二阈值。
与中继选择不同的是，远端设备不是判断与基站之间的直接通信链路的信号质量，而是判断与已连接的中继设备之间的第三通信链路的信号质量。可以理解的，如果第三通信链路的信号质量不好，则说明当前已连接的中继设备并不能提供很好的数据服务，因为可以触发中继重选，以寻求更好的数据服务。
触发条件二、接收到第五指示信息，第五指示信息用于指示与已连接的中继设备断开链接。
该第五指示信息可以由远端设备的高层下发，也可以由已连接的中继设备发送给该远端设备。例如，该远端设备的高层下发释放消息(release message)，以指示与已连接的中继设备断开链接。或者，已连 接的中继设备通过第三通信链路向远端设备发送第五指示信息，以指示断开，比如，该已连接的中继设备在自身的小区服务终止时，或者在其负荷达到阈值时，可以指示远端设备断开当前的链接。
触发条件三、远端设备的高层触发。
远端设备的高层在满足一定条件时会指示进行中继重选。比如，该远端设备的高层发现当前已连接的中继设备无法满足当前或更多业务需求时，或者该高层开启了时延敏感业务或数据量较大的业务等，当前已连接的中继设备并不能支持，高层可以触发中继重选。
触发条件四、已连接的中继设备的剩余小区服务时间达到目标值。
已连接的中继设备的剩余小区服务时间达到目标值，已连接的中继设备的小区服务已结束或快要结束时，远端设备进行中继重选。
该目标值可以为预配置的，也可以为根据远端设备的类型确定的，还可以为根据远端设备注册的业务类型确定的。比如，该目标值为零，或者一个比较小的数值。本申请实施例对该目标值的取值和确定方式不作限定。
触发条件五、系统时间已达到已连接的中继设备的小区服务停止时刻。
该触发条件五与触发条件四同理，系统时间已达到该小区服务停止时间，已连接的中继设备的小区服务已结束，远端设备可以进行中继重选。
通过上述触发条件触发中继重选后，该远端设备可以根据候选中继设备的网络接入方式进行中继重选。在根据中继选择准则和中继设备的网络接入方式，进行中继重选时，可以通过如图16所示的中继重选方法实现。该方法包括：
步骤1601：确定满足第二准则的第二候选中继设备集合。
步骤1602：在第二候选中继设备集合中，按照第一准则中的筛选条件筛选出第三候选中继设备集合，筛选条件包括与最好的第二通信链路的信号质量之差在门限范围之内。
步骤1603：在第三候选中继设备集合中，根据候选中继设备的网络接入方式进行中继重选。
通过第二准则先对候选中继设备进行了初步筛选，确定出第二候选中继设备集合，然后再基于第一准则进行再次筛选，将第二通信链路的信号质量好的候选中继设备确定出来作为第四候选中继设备集合，进而再基于网络接入方式进行中继重选。通过多步筛选，充分利用了多种准则和网络接入方式，能够使得最终的选择结果为远端设备提供更好的小区服务。
在步骤1602中，该门限范围可以表示为RangetoBestRelay。筛选条件可以为预配置的，也可以为由基站配置的，比如，由gNB通过SIB/RRC消息提供，本申请实施例对此不作限定。
通过步骤1602和步骤1603，将满足第二准则且第二通信链路的信号质量比较好的候选中继设备筛选了出来，无需针对每个候选中继设备的网络接入方式进行判断，能够大大减少计算量，提高中继重选效率。
在该步骤1603中，远端设备可以通过下述多种情况中的任一种情况进行中继重选。
情况一、在第三候选中继设备集合中，优先重选网络接入方式为地面接入的候选中继设备。
情况二、在第三候选中继设备集合中，优先重选网络接入方式为地面接入的候选中继设备，次优先重选网络接入方式为NTN接入且NTN小区的小区类型为地球固定小区的候选中继设备。
情况三、在第四候选中继设备集合中，优先重选第一通信链路的时延最小的候选中继设备。
情况四、在第三候选中继设备集合中，优先重选网络接入方式为地面接入的候选中继设备，次优先重选网络接入方式为NTN接入且NTN小区的剩余小区服务时间最大的候选中继设备。
情况五、在第三候选中继设备集合中，优先重选网络接入方式为地面接入的候选中继设备，次优先重选网络接入方式为NTN接入且NTN小区的小区服务停止时刻与系统时间之间的差值最大的候选中继设备。
在上述可能的五种情况中，考虑到地面接入的优势，中继重选时也是优先重选地面接入的候选中继设备，在第三候选中继设备集合中均是NTN接入的候选中继设备的情况下，可以根据其他因素进行次优先重选，这几种因素的选择理由与中继选择时同理，在此不多做赘述。
在一些实施例中，与中继选择同理的，中继重选过程也可以考虑远端设备的自身特性。相应地，中继重选过程可以为：确定满足第二准则的第二候选中继设备集合，然后在第二候选中继设备集合中，按照第一准则中的筛选条件筛选出第三候选中继设备集合，筛选条件包括与最好的第二通信链路的信号质量之差在门限范围之内，最后在第三候选中继设备集合中，优先重选网络接入方式为地面接入且第二通信链路的信号质量最好的候选中继设备。
其中，前两个步骤与上述同理，在最后，不管终端的自身特性是否支持NTN接入，考虑到地面接入的优势，优先重选地面接入且第二通信链路的信号质量最好的候选中继设备。
如果第三候选中继设备集合中均为NTN接入的候选中继设备，则可以在终端设备的自身特性支持 NTN接入的情况下，次优先重选第三候选中继设备集合中满足第四选择条件集合中的任一种选择条件的候选中继设备。
其中，第四选择条件集合包括如下选择条件中的至少一种：
第一通信链路的时延信息小于或等于第一门限的候选中继设备中第二通信链路的信号质量最好，第一通信链路为候选中继设备与基站之间的通信链路；
第一通信链路的时延信息最小；
NTN小区的小区类型为地球固定类型的候选中继设备中第二通信链路的信号质量最好；
NTN小区的剩余小区服务时间大于或等于第二门限的候选中继设备中第二通信链路的信号质量最好；
NTN小区的剩余小区服务时间最大；
NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限的候选中继设备中第二通信链路的信号质量最好；
NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
在远端设备的自身特性不支持NTN接入的情况下，重选第三候选中继设备集合中第二通信链路的信号质量最好的候选中继设备。比如，该远端设备所注册的业务类型为时延敏感业务，或者远端设备的类型不支持NTN接入时，不满足上述优先重选和次优先重选的条件，可以选择第二通信链路的信号质量最好的候选中继设备，以尽可能地保证小区服务质量。
下面针对上述中继重选过程提供五个具体示例，在该五个具体示例中，分别应用了上述中继重选时的任一种或多种情况中的方法步骤。
在下述示例中，将第一指示信息称为Relay UE与gNB之间的Uu链路是NTN接入的指示信息，将第二指示信息称为指示Relay UE的Uu链路的NTN接入类型(如GEO、LEO等)的指示信息，将第一通信链路的时延信息称为Relay UE的Uu链路的时延信息，将第三指示信息称为earth fixed/earth moving cell指示信息，将第四指示信息称为cell leaving time信息。
示例六：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路是NTN接入的指示信息和/或指示Relay UE的Uu链路的NTN接入类型(如GEO、LEO等)的指示信息和/或Relay UE的Uu链路的时延信息和/或earth fixed/earth moving cell指示信息和/或cell leaving time信息.Remote UE根据发现消息中的上述信息，执行中继重选，具体如下：
-Remote UE根据发现消息中的信息确认Relay UE与gNB之间的Uu链路是否为NTN接入。确认方式为：如果一个Relay UE的发现消息中包含了上述信息，Remote UE认为该Relay UE与gNB之间的Uu链路是NTN接入。
-在所有满足高层准则的Relay UE中，Remote UE对当前Relay UE(Remote UE已连接的Relay UE)和候选Relay UE按照基于RSRP的接入层中继重选准则排序：
-Remote UE通过rangeToBestRelay来确定出候选的Relay UE。其中，候选的Relay UE与最好Relay UE的PC5信号质量之差在rangeToBestCell范围内。最好Relay UE的PC5信号质量是指上述排序的Relay UE的PC5信号质量的最大值。Remote UE可以在候选的Relay UE中，优先选择Relay UE与gNB之间的Uu链路不是NTN接入(即地面接入)的具有最好PC5信号质量的Relay UE为目标Relay UE。如果候选的Relay UE中不存在与gNB之间的Uu链路为地面接入的Relay UE，则Remote UE选择具有最好PC5信号质量的Relay UE为目标Relay UE。其中，rangeToBestRelay可以预配置或由gNB通过SIB/RRC消息提供。
示例七：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路的earth fixed/earth moving cell指示信息。Remote UE根据发现消息中的earth fixed/earth moving cell指示信息，执行中继重选，具体如下：
-在所有满足高层准则的Relay UE中，Remote UE对当前Relay UE和候选Relay UE按照基于RSRP的接入层中继重选准则排序：
-Remote UE通过rangeToBestRelay确定出候选的Relay UE。其中，候选的Relay UE与最好Relay UE的PC5信号质量之差在rangeToBestCell范围内。最好Relay UE的PC5信号质量是指上述排序的Relay UE的PC5信号质量的最大值。Remote UE可以在候选的Relay UE中，优先选择Relay UE与gNB之间的Uu链路不是NTN接入的具有最好PC5信号质量的Relay UE为目标Relay UE。如果候选的Relay UE中不存在与gNB之间的Uu链路为地面接入的Relay UE，则Remote UE在NTN接入的Relay UE中，优先选择Relay UE与gNB之间的Uu链路是earth fixed cell的具有最好PC5信号质量的Relay UE为目标Relay UE。如果NTN接入的Relay UE中不存在Uu链路是earth fixed cell的Relay UE，也 即是，如果NTN接入的Relay UE的Uu链路均是earth moving cell，Remote UE选择具有最好PC5信号质量的Relay UE为目标Relay UE。其中，rangeToBestRelay可以预配置或由gNB通过SIB/RRC消息提供。
示例八：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路的时延信息。Remote UE根据发现消息中的Uu链路的时延信息，执行中继重选，具体如下：
-在所有满足高层准则的Relay UE中，Remote UE对当前Relay UE和候选Relay UE按照基于RSRP的接入层中继重选准则排序。
-Remote UE通过rangeToBestRelay确定出候选的Relay UE。其中，候选的Relay UE与最好Relay UE的PC5信号质量之差在rangeToBestCell范围内。最好Relay UE的PC5信号质量是指上述排序的Relay UE的PC5信号质量的最大值。Remote UE可以在候选的Relay UE中，选择Uu链路的时延最小的Relay UE为目标Relay UE。其中，rangeToBestRelay可以预配置或由gNB通过SIB/RRC消息提供。
示例九：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路的cell leaving time信息。Remote UE根据发现消息中的cell leaving time信息，执行中继重选，具体如下：
-在所有满足高层准则的Relay UE中，Remote UE对当前Relay UE和候选Relay UE按照基于RSRP的接入层中继重选准则排序。
-Remote UE通过rangeToBestRelay确定出候选的Relay UE，其中，候选的Relay UE与最好Relay UE的PC5信号质量之差在rangeToBestCell范围内。最好Relay UE的PC5信号质量是指上述排序的Relay UE的PC5信号质量的最大值。Remote UE可以在候选的Relay UE中，优先选择Relay UE与gNB之间的Uu链路不是NTN接入的具有最好PC5信号质量的Relay UE为目标Relay UE。如果候选的Relay UE中不存在Uu链路不是NTN接入的Relay UE，也即是，候选的Relay UE的Uu链路均是NTN接入，则Remote UE在NTN接入的Relay UE中，选择Uu链路的剩余小区服务时间最长/大的Relay UE为目标Relay UE。其中，rangeToBestRelay可以预配置或由gNB通过SIB/RRC消息提供。
或者，也可以把不是NTN接入(即地面接入)的Relay UE视为具有无限的剩余小区服务时间。Remote UE不用区分Relay UE的是NTN接入还是非NTN接入，直接按照基于RSRP的接入层中继重选准则对满足高层准则的Relay UE全部排序，然后通过rangeToBestRelay确定出候选的Relay UE。其中，该候选的Relay UE与最好PC5信号质量差rangeToBestRelay范围内。Remote UE在确定出的候选Relay UE中，选择Uu链路的剩余小区服务时间最长的Relay UE为目标Relay UE。
示例十：
Relay UE的发现消息中包括Relay UE与gNB之间的Uu链路是NTN接入的指示信息和/或指示Relay UE的Uu链路的NTN接入类型(如GEO、LEO等)的指示信息和/或Relay UE的Uu链路的时延信息和/或earth fixed/earth moving cell指示信息和/或cell leaving time信息。Remote UE根据发现消息中的上述信息，执行中继重选，具体如下：
-Remote UE结合自身特性或能力，如UE的终端类型、UE注册的业务类型等，确定是否支持该Relay UE的Uu链路的NTN接入类型。
-在所有满足高层准则的Relay UE中，Remote UE对当前Relay UE和候选Relay UE按照基于RSRP的接入层中继重选准则排序。
-Remote UE通过rangeToBestCell确定出候选的Relay UE。其中，候选的Relay UE与最好Relay UE的PC5信号质量之差在rangeToBestCell范围内。最好Relay UE的PC5信号质量是指上述排序的Relay UE的PC5信号质量的最大值。Remote UE可以在确定出的候选Relay UE中，优先选择Remote UE自身终端类型和/或注册的业务类型支持的Relay UE中具有最好信号质量的Relay UE为目标Relay UE。如果Remote UE自身终端类型和/或注册的业务类型不支持所有的候选Relay UE，Remote UE选择具有最好信号质量的Relay UE为目标Relay UE。其中，rangeToBestRelay可以预配置或由gNB通过SIB/RRC消息提供。
图17示出了本申请一个示例性实施例提供的中继确定装置的结构示意图，该装置包括：
处理模块1701，用于根据候选中继设备的网络接入方式进行中继选择或中继重选；
其中，网络接入方式包括NTN接入或地面接入。
在一些实施例中，候选中继设备的网络接入方式由候选中继设备的发现消息携带。
在一些实施例中，候选中继设备的网络接入方式通过如下信息中的至少一种信息指示：
第一指示信息，第一指示信息用于指示第一通信链路是否通过非地面通信网络NTN接入，第一通信链路为候选中继设备与基站之间的通信链路；
第二指示信息，第二指示信息用于指示第一通信链路的NTN类型；
第一通信链路的时延信息；
第三指示信息，第三指示信息用于指示第一通信链路的NTN小区的小区类型；
第四指示信息，第四指示信息用于指示第一通信链路的NTN小区的剩余小区服务时间或小区服务停止时刻。
在一些实施例中，装置还包括确定模块，确定模块用于：
在候选中继设备的发现消息携带有第一指示信息，且第一指示信息为0的情况下，确定候选中继设备的网络接入方式为NTN接入；在候选中继设备的发现消息携带有第一指示信息，且第一指示信息为1的情况下，确定候选中继设备的网络接入方式为地面接入；
或，在候选中继设备的发现消息携带有第一指示信息，且第一指示信息为0的情况下，确定候选中继设备的网络接入方式为地面接入；在候选中继设备的发现消息携带有第一指示信息，且第一指示信息为1的情况下，确定候选中继设备的网络接入方式为NTN接入；
或，在候选中继设备的发现消息携带有第二指示信息、第三指示消息、第四指示信息中的任一项的情况下，确定候选中继设备的网络接入方式为NTN接入；
或，在候选中继设备的发现消息携带有第一通信链路的时延信息，且时延信息大于第一门限的情况下，确定候选中继设备的网络接入方式为NTN接入，第一通信链路为候选中继设备与基站之间的通信链路；
或，在候选中继设备的发现消息携带有第一通信链路的时延信息，且时延信息小于或等于第一门限的情况下，候选中继设备的网络接入方式为地面接入；
或，在候选中继设备的发现消息未携带有第一指示信息、第二指示信息、第一通信链路的时延信息、第三指示信息和第四指示信息中的任一项的情况下，确定候选中继设备的网络接入方式为地面接入；
其中，第一指示信息用于指示第一通信链路是否通过非地面通信网络NTN接入；
第二指示信息用于指示第一通信链路的NTN类型；
第三指示信息用于指示第一通信链路的NTN小区的小区类型；
第四指示信息用于指示第一通信链路的NTN小区的剩余小区服务时间或小区服务停止时刻。
在一些实施例中，处理模块1701用于：
根据中继选择准则和候选中继设备的网络接入方式，进行中继选择或中继重选；
其中，中继选择准则包括第一准则或第二准则中的至少一项，第一准则包括远端设备与候选中继设备之间的第二通信链路的信号质量满足第一条件，第二准则是候选中继设备满足高层准则。
在一些实施例中，处理模块1701用于：
确定满足中继选择准则的一个候选中继设备；
基于候选中继设备的网络接入方式进行中继选择。
在一些实施例中，处理模块1701用于：
在候选中继设备的网络接入方式是地面接入的情况下，选择候选中继设备；在候选中继设备的网络接入方式为NTN接入的情况下，放弃接入候选中继设备；
或，在候选中继设备的第一通信链路的时延信息小于或等于第一门限的情况下，选择候选中继设备，第一通信链路为候选中继设备与基站之间的通信链路；在候选中继设备的第一通信链路的时延信息大于第一门限的情况下，放弃接入候选中继设备；
或，在候选中继设备的NTN小区的小区类型为地球固定类型的情况下，选择候选中继设备；在候选中继设备的网络接入方式为地球移动类型的情况下，放弃接入候选中继设备；
或，在候选中继设备的NTN小区的剩余小区服务时间大于或等于第二门限的情况下，选择候选中继设备；在候选中继设备的NTN小区的剩余小区服务时间小于第二门限的情况下，放弃接入候选中继设备；
或，在候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限的情况下，选择候选中继设备；在候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值小于第二门限的情况下，放弃接入候选中继设备。
在一些实施例中，处理模块1701用于：
确定满足中继选择准则的第一候选中继设备集合；
在第一候选中继设备集合中，基于候选中继设备的网络接入方式进行中继选择。
在一些实施例中，处理模块1701用于：
在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备；
或，在第一候选中继设备集合中，优先选择第一通信链路的时延信息小于或等于第一门限的候选中 继设备，第一通信链路为候选中继设备与基站之间的通信链路；
或，在第一候选中继设备集合中，优先选择第一通信链路的时延信息最小的候选中继设备；
或，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的中继设备，次优先选择网络接入方式为NTN接入且NTN小区的小区类型为地球固定类型的候选中继设备；
或，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的中继设备，次优先选择网络接入方式为NTN接入且NTN小区的剩余小区服务时间大于或等于第二门限的候选中继设备；
或，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的中继设备，次优先选择网络接入方式为NTN接入且NTN小区的剩余小区服务时间最大的候选中继设备；
或，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的中继设备，次优先选择网络接入方式为NTN接入且NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限的候选中继设备；
或，在第一候选中继设备集合中，优先选择网络接入方式为地面接入的中继设备，次优先选择网络接入方式为NTN接入且NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
在一些实施例中，第一门限和第二门限中的至少一个门限是：
预配置的；
或，基站配置的；
或，根据远端设备的类型确定的；
或，根据远端设备注册的业务类型确定的。
在一些实施例中，处理模块1701用于：
确定满足中继选择准则的一个候选中继设备；
基于远端设备的自身特性和候选中继设备的网络接入方式进行中继选择；
其中，远端设备的自身特性包括：远端设备的类型和注册的业务类型中的至少一种。
在一些实施例中，处理模块1701用于：
在候选中继设备的网络接入方式为地面接入的情况下，选择候选中继设备；
或，在候选中继设备的网络接入方式为NTN接入的情况下，且远端设备的自身特性支持NTN接入的情况下，选择候选中继设备。
在一些实施例中，处理模块1701用于：
确定满足中继选择准则的第一候选中继设备集合；
在第一候选中继设备集合中，基于远端设备的自身特性和候选中继设备的网络接入方式进行中继选择；
其中，远端设备的自身特性包括：远端设备的类型和注册的业务类型中的至少一种。
在一些实施例中，处理模块1701用于：
在第一候选中继设备集合中，优先选择网络接入方式为地面接入的候选中继设备；在远端设备的自身特性支持NTN接入的情况下，次优先选择满足第一选择条件集合中的任一种选择条件的候选中继设备；
其中，第一选择条件集合包括如下选择条件中的至少一种：
第一通信链路的时延信息小于或等于第一门限，第一通信链路为候选中继设备与基站之间的通信链路；
第一通信链路的时延信息最小；
NTN小区的小区类型为地球固定类型；
NTN小区的剩余小区服务时间大于或等于第二门限；
NTN小区的剩余小区服务时间最大；
NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限；
NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
在一些实施例中，处理模块1701用于：
确定满足第二准则的第二候选中继设备集合；
在第二候选中继设备集合中，按照第一准则中的筛选条件筛选出第三候选中继设备集合，筛选条件包括与最好的第二通信链路的信号质量之差在门限范围之内；
在第三候选中继设备集合中，根据候选中继设备的网络接入方式进行中继重选。
在一些实施例中，在一些实施例中，处理模块1701用于：
在第三候选中继设备集合中，优先重选网络接入方式为地面接入的候选中继设备；
或，在第三候选中继设备集合中，优先重选网络接入方式为地面接入的候选中继设备，次优先重选 网络接入方式为NTN接入且NTN小区的小区类型为地球固定小区的候选中继设备；
或，在第三候选中继设备集合中，优先重选第一通信链路的时延最小的候选中继设备；
或，在第三候选中继设备集合中，优先重选网络接入方式为地面接入的候选中继设备，次优先重选网络接入方式为NTN接入且NTN小区的剩余小区服务时间最大的候选中继设备；
或，在第三候选中继设备集合中，优先重选网络接入方式为地面接入的候选中继设备，次优先重选网络接入方式为NTN接入且NTN小区的小区服务停止时刻与系统时间之间的差值最大的候选中继设备。
在一些实施例中，处理模块1701用于：
确定满足第二准则的第二候选中继设备集合；
在第二候选中继设备集合中，按照第一准则中的筛选条件筛选出第三候选中继设备集合，筛选条件包括与最好的第二通信链路的信号质量之差在门限范围之内；
在第三候选中继设备集合中，优先重选网络接入方式为地面接入且第二通信链路的信号质量最好的候选中继设备。
在一些实施例中，处理模块1701用于：
在终端设备的自身特性支持NTN接入的情况下，次优先重选第三候选中继设备集合中满足第二选择条件集合中的任一种选择条件的候选中继设备；
在远端设备的自身特性不支持NTN接入的情况下，重选第三候选中继设备集合中第二通信链路的信号质量最好的候选中继设备；
其中，远端设备的自身特性包括：终端类型和注册的业务类型中的至少一种；
第二选择条件集合包括如下选择条件中的至少一种：
第一通信链路的时延信息小于或等于第一门限的候选中继设备中第二通信链路的信号质量最好，第一通信链路为候选中继设备与基站之间的通信链路；
第一通信链路的时延信息最小；
NTN小区的小区类型为地球固定类型的候选中继设备中第二通信链路的信号质量最好；
NTN小区的剩余小区服务时间大于或等于第二门限的候选中继设备中第二通信链路的信号质量最好；
NTN小区的剩余小区服务时间最大；
NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限的候选中继设备中第二通信链路的信号质量最好；
NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
在一些实施例中，筛选条件为：
预配置的；
或，由基站配置的。
在一些实施例中，中继选择的触发条件为：
远端设备的直接通信链路的信号质量低于第一阈值；
或，远端设备的高层触发。
在一些实施例中，中继重选的触发条件为：
远端设备与已连接的中继设备之间的第三通信链路的信号质量低于第二阈值；
或，接收到第五指示信息，第五指示信息用于指示与已连接的中继设备断开链接；
或，远端设备的高层触发；
或，已连接的中继设备的剩余小区服务时间达到目标值；
或，系统时间已达到已连接的中继设备的小区服务停止时刻。
图18示出了本申请一个示例性实施例提供的远端设备的结构示意图，该远端设备包括：处理器111、接收器112、发射器113、存储器114和总线115。
处理器111包括一个或者一个以上处理核心，处理器111通过运行软件程序以及模块，从而执行各种功能应用以及信息处理。
接收器112和发射器113可以实现为一个通信组件，该通信组件可以是一块通信芯片。
存储器114通过总线115与处理器111相连。
存储器114可用于存储至少一个指令，处理器111用于执行该至少一个指令，以实现上述方法实施例中的各个步骤。
此外，存储器114可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，易失性或非易失性存储设备包括但不限于：磁盘或光盘，电可擦除可编程只读存储器(EEPROM，Electrically Erasable  Programmable Read Only Memory)，可擦除可编程只读存储器(EPROM，Erasable Programmable Read Only Memory)，静态随时存取存储器(SRAM，Static Random-Access Memory)，只读存储器(ROM，Read Only Memory)，磁存储器，快闪存储器，可编程只读存储器(PROM，Programmable Read Only Memory)。
在示例性实施例中，还提供了一种包括计算机可读存储介质，计算机可读存储介质中存储有至少一条指令。例如包括指令的存储器，上述指令可由处理器执行以完成上述中继确定方法。例如，计算机可读存储介质可以是ROM、随机存取存储器(RAM，Random-Access Memory)、紧凑型光盘只读存储器(CD-ROM，Compact Disc Read Only Memory)、磁带、软盘和光数据存储设备等。可选地，该计算机可读存储介质为非临时性计算机可读存储介质。
应当理解的是，在本文中提及的“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本申请的其它实施方案。本申请旨在涵盖本申请的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本申请的一般性原理并包括本申请未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本申请的真正范围和精神由下面的权利要求指出。
应当理解的是，本申请并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本申请的范围仅由所附的权利要求来限制。

Claims (44)

  1. 一种中继确定方法，其特征在于，所述方法由远端设备执行，所述方法包括：
    根据候选中继设备的网络接入方式进行中继选择或中继重选；
    其中，所述网络接入方式包括非地面通信网络NTN接入或地面接入。
  2. 根据权利要求1所述的方法，其特征在于，所述候选中继设备的网络接入方式由所述候选中继设备的发现消息携带。
  3. 根据权利要求1或2所述的方法，其特征在于，所述候选中继设备的网络接入方式通过如下信息中的至少一种信息指示：
    第一指示信息，所述第一指示信息用于指示第一通信链路是否通过NTN接入，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    第二指示信息，所述第二指示信息用于指示所述第一通信链路的NTN类型；
    所述第一通信链路的时延信息；
    第三指示信息，所述第三指示信息用于指示所述第一通信链路的NTN小区的小区类型；
    第四指示信息，所述第四指示信息用于指示所述第一通信链路的NTN小区的剩余小区服务时间或小区服务停止时刻。
  4. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    在所述候选中继设备的发现消息携带有第一指示信息，且所述第一指示信息为0的情况下，确定所述候选中继设备的网络接入方式为所述NTN接入；在候选中继设备的发现消息携带有所述第一指示信息，且所述第一指示信息为1的情况下，确定所述候选中继设备的网络接入方式为所述地面接入；
    或，在所述候选中继设备的发现消息携带有所述第一指示信息，且所述第一指示信息为0的情况下，确定所述候选中继设备的网络接入方式为所述地面接入；在候选中继设备的发现消息携带有所述第一指示信息，且所述第一指示信息为1的情况下，确定所述候选中继设备的网络接入方式为所述NTN接入；
    或，在所述候选中继设备的发现消息携带有第二指示信息、第三指示消息、第四指示信息中的任一项的情况下，确定所述候选中继设备的网络接入方式为所述NTN接入；
    或，在所述候选中继设备的发现消息携带有第一通信链路的时延信息，且所述时延信息大于第一门限的情况下，确定所述候选中继设备的网络接入方式为所述NTN接入，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    或，在所述候选中继设备的发现消息携带有所述第一通信链路的时延信息，且所述时延信息小于或等于所述第一门限的情况下，所述候选中继设备的网络接入方式为所述地面接入；
    或，在所述候选中继设备的发现消息未携带有所述第一指示信息、所述第二指示信息、所述第一通信链路的时延信息、所述第三指示信息和所述第四指示信息中的任一项的情况下，确定所述候选中继设备的网络接入方式为所述地面接入。
  5. 根据权利要求1至4任一项所述的方法，其特征在于，所述根据候选中继设备的网络接入方式进行中继选择或中继重选，包括：
    根据中继选择准则和所述候选中继设备的网络接入方式，进行中继选择或中继重选；
    其中，所述中继选择准则包括第一准则或第二准则中的至少一项，所述第一准则包括所述远端设备与所述候选中继设备之间的第二通信链路的信号质量满足第一条件，所述第二准则是所述候选中继设备满足高层准则。
  6. 根据权利要求5所述的方法，其特征在于，所述根据中继选择准则和所述中继设备的网络接入方式，进行中继选择，包括：
    确定满足所述中继选择准则的一个所述候选中继设备；
    基于所述候选中继设备的网络接入方式进行中继选择。
  7. 根据权利要求6所述的方法，其特征在于，所述基于所述候选中继设备的网络接入方式进行中继选择，包括：
    在所述候选中继设备的网络接入方式是地面接入的情况下，选择所述候选中继设备；在所述候选中继设备的网络接入方式为NTN接入的情况下，放弃接入所述候选中继设备；
    或，在所述候选中继设备的第一通信链路的时延信息小于或等于第一门限的情况下，选择所述候选中继设备，所述第一通信链路为所述候选中继设备与基站之间的通信链路；在所述候选中继设备的第一通信链路的时延信息大于所述第一门限的情况下，放弃接入所述候选中继设备；
    或，在所述候选中继设备的NTN小区的小区类型为地球固定类型的情况下，选择所述候选中继设 备；在所述候选中继设备的网络接入方式为地球移动类型的情况下，放弃接入所述候选中继设备；
    或，在所述候选中继设备的NTN小区的剩余小区服务时间大于或等于第二门限的情况下，选择所述候选中继设备；在所述候选中继设备的NTN小区的剩余小区服务时间小于第二门限的情况下，放弃接入所述候选中继设备；
    或，在所述候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限的情况下，选择所述候选中继设备；在所述候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值小于第二门限的情况下，放弃接入所述候选中继设备。
  8. 根据权利要求5所述的方法，其特征在于，所述根据中继选择准则和所述中继设备的网络接入方式，进行中继选择，包括：
    确定满足所述中继选择准则的第一候选中继设备集合；
    在所述第一候选中继设备集合中，基于所述候选中继设备的网络接入方式进行中继选择。
  9. 根据权利要求6所述的方法，其特征在于，所述在所述第一候选中继设备集合中，基于所述候选中继设备的网络接入方式进行中继选择，包括：
    在所述第一候选中继设备集合中，优先选择所述网络接入方式为所述地面接入的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择第一通信链路的时延信息小于或等于第一门限的候选中继设备，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    或，在所述第一候选中继设备集合中，优先选择第一通信链路的时延信息最小的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的小区类型为地球固定类型的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的剩余小区服务时间大于或等于第二门限的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的剩余小区服务时间最大的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的小区服务停止时刻与系统时间的差值大于或等于所述第二门限的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
  10. 根据权利要求4、7、9中任一项所述的方法，其特征在于，所述第一门限和所述第二门限中的至少一个门限是：
    预配置的；
    或，基站配置的；
    或，根据所述远端设备的类型确定的；
    或，根据所述远端设备注册的业务类型确定的。
  11. 根据权利要求5所述的方法，其特征在于，所述根据中继选择准则和所述中继设备的网络接入方式，进行中继选择，包括：
    确定满足所述中继选择准则的一个所述候选中继设备；
    基于所述远端设备的自身特性和所述候选中继设备的网络接入方式进行中继选择；
    其中，所述远端设备的自身特性包括：远端设备的类型和注册的业务类型中的至少一种。
  12. 根据权利要求11所述的方法，其特征在于，所述基于所述远端设备的自身特性和所述候选中继设备的网络接入方式进行中继选择，包括：
    在所述候选中继设备的网络接入方式为所述地面接入的情况下，选择所述候选中继设备；
    或，在所述候选中继设备的网络接入方式为所述NTN接入的情况下，且所述远端设备的自身特性支持NTN接入的情况下，选择所述候选中继设备。
  13. 根据权利要求5所述的方法，其特征在于，所述根据中继选择准则和所述中继设备的网络接入方式，进行中继选择，包括：
    确定满足所述中继选择准则的第一候选中继设备集合；
    在所述第一候选中继设备集合中，基于所述远端设备的自身特性和所述候选中继设备的网络接入 方式进行中继选择；
    其中，所述远端设备的自身特性包括：远端设备的类型和注册的业务类型中的至少一种。
  14. 根据权利要求13所述的方法，其特征在于，所述在所述第一候选中继设备集合中，基于所述远端设备的自身特性和所述候选中继设备的网络接入方式进行中继选择，包括：
    在所述第一候选中继设备集合中，优先选择所述网络接入方式为所述地面接入的候选中继设备；在所述远端设备的自身特性支持所述NTN接入的情况下，次优先选择满足第一选择条件集合中的任一种选择条件的候选中继设备；
    其中，所述第一选择条件集合包括如下选择条件中的至少一种：
    第一通信链路的时延信息小于或等于第一门限，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    所述第一通信链路的时延信息最小；
    NTN小区的小区类型为地球固定类型；
    所述NTN小区的剩余小区服务时间大于或等于第二门限；
    所述NTN小区的剩余小区服务时间最大；
    所述NTN小区的小区服务停止时刻与系统时间的差值大于或等于所述第二门限；
    所述NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
  15. 根据权利要求5所述的方法，其特征在于，所述根据中继选择准则和所述候选中继设备的网络接入方式，进行中继重选，包括：
    确定满足所述第二准则的第二候选中继设备集合；
    在所述第二候选中继设备集合中，按照所述第一准则中的筛选条件筛选出第三候选中继设备集合，所述筛选条件包括与最好的所述第二通信链路的信号质量之差在门限范围之内；
    在所述第三候选中继设备集合中，根据所述候选中继设备的网络接入方式进行中继重选。
  16. 根据权利要求15所述的方法，其特征在于，所述在所述第三候选中继设备集合中，根据所述候选中继设备的网络接入方式进行中继重选，包括：
    在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入的候选中继设备；
    或，在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入的候选中继设备，次优先重选所述网络接入方式为NTN接入且NTN小区的小区类型为地球固定小区的候选中继设备；
    或，在所述第三候选中继设备集合中，优先重选第一通信链路的时延最小的候选中继设备；
    或，在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入的候选中继设备，次优先重选所述网络接入方式为NTN接入且所述NTN小区的剩余小区服务时间最大的候选中继设备；
    或，在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入的候选中继设备，次优先重选所述网络接入方式为NTN接入且所述NTN小区的小区服务停止时刻与系统时间之间的差值最大的候选中继设备。
  17. 根据权利要求5所述的方法，其特征在于，所述根据中继选择准则和所述候选中继设备的网络接入方式，进行中继重选，包括：
    确定满足所述第二准则的第二候选中继设备集合；
    在所述第二候选中继设备集合中，按照所述第一准则中的筛选条件筛选出第三候选中继设备集合，所述筛选条件包括与最好的所述第二通信链路的信号质量之差在门限范围之内；
    在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入且第二通信链路的信号质量最好的候选中继设备。
  18. 根据权利要求17所述的方法，其特征在于，所述方法还包括：
    在所述终端设备的自身特性支持所述NTN接入的情况下，次优先重选所述第三候选中继设备集合中满足第二选择条件集合中的任一种选择条件的候选中继设备；
    在所述远端设备的自身特性不支持NTN接入的情况下，重选所述第三候选中继设备集合中第二通信链路的信号质量最好的候选中继设备；
    其中，所述远端设备的自身特性包括：终端类型和注册的业务类型中的至少一种；
    所述第二选择条件集合包括如下选择条件中的至少一种：
    第一通信链路的时延信息小于或等于第一门限的候选中继设备中所述第二通信链路的信号质量最好，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    所述第一通信链路的时延信息最小；
    NTN小区的小区类型为地球固定类型的候选中继设备中所述第二通信链路的信号质量最好；
    所述NTN小区的剩余小区服务时间大于或等于第二门限的候选中继设备中所述第二通信链路的信 号质量最好；
    所述NTN小区的剩余小区服务时间最大；
    所述NTN小区的小区服务停止时刻与系统时间的差值大于或等于所述第二门限的候选中继设备中所述第二通信链路的信号质量最好；
    所述NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
  19. 根据权利要求15或17所述的方法，其特征在于，所述筛选条件为：
    预配置的；
    或，由基站配置的。
  20. 根据权利要求6至14任一项所述的方法，其特征在于，所述中继选择的触发条件为：
    所述远端设备的直接通信链路的信号质量低于第一阈值；
    或，所述远端设备的高层触发。
  21. 根据权利要求15至19任一项所述的方法，其特征在于，所述中继重选的触发条件为：
    所述远端设备与已连接的中继设备之间的第三通信链路的信号质量低于第二阈值；
    或，接收到第五指示信息，所述第五指示信息用于指示与已连接的中继设备断开链接；
    或，所述远端设备的高层触发；
    或，已连接的中继设备的剩余小区服务时间达到目标值；
    或，系统时间已达到所述已连接的中继设备的小区服务停止时刻。
  22. 一种中继确定装置，其特征在于，所述装置包括：
    处理模块，用于根据候选中继设备的网络接入方式进行中继选择或中继重选；
    其中，所述网络接入方式包括非地面通信网络NTN接入或地面接入。
  23. 根据权利要求22所述的装置，其特征在于，所述候选中继设备的网络接入方式由所述候选中继设备的发现消息携带。
  24. 根据权利要求22或23所述的装置，其特征在于，所述候选中继设备的网络接入方式通过如下信息中的至少一种信息指示：
    第一指示信息，所述第一指示信息用于指示第一通信链路是否通过NTN接入，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    第二指示信息，所述第二指示信息用于指示所述第一通信链路的NTN类型；
    所述第一通信链路的时延信息；
    第三指示信息，所述第三指示信息用于指示所述第一通信链路的NTN小区的小区类型；
    第四指示信息，所述第四指示信息用于指示所述第一通信链路的NTN小区的剩余小区服务时间或小区服务停止时刻。
  25. 根据权利要求24所述的装置，其特征在于，所述装置还包括确定模块，所述确定模块用于：
    在所述候选中继设备的发现消息携带有第一指示信息，且所述第一指示信息为0的情况下，确定所述候选中继设备的网络接入方式为所述NTN接入；在候选中继设备的发现消息携带有所述第一指示信息，且所述第一指示信息为1的情况下，确定所述候选中继设备的网络接入方式为所述地面接入；
    或，在所述候选中继设备的发现消息携带有所述第一指示信息，且所述第一指示信息为0的情况下，确定所述候选中继设备的网络接入方式为所述地面接入；在候选中继设备的发现消息携带有所述第一指示信息，且所述第一指示信息为1的情况下，确定所述候选中继设备的网络接入方式为所述NTN接入；
    或，在所述候选中继设备的发现消息携带有第二指示信息、第三指示消息、第四指示信息中的任一项的情况下，确定所述候选中继设备的网络接入方式为所述NTN接入；
    或，在所述候选中继设备的发现消息携带有第一通信链路的时延信息，且所述时延信息大于第一门限的情况下，确定所述候选中继设备的网络接入方式为所述NTN接入，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    或，在所述候选中继设备的发现消息携带有所述第一通信链路的时延信息，且所述时延信息小于或等于所述第一门限的情况下，所述候选中继设备的网络接入方式为所述地面接入；
    或，在所述候选中继设备的发现消息未携带有所述第一指示信息、所述第二指示信息、所述第一通信链路的时延信息、所述第三指示信息和所述第四指示信息中的任一项的情况下，确定所述候选中继设备的网络接入方式为所述地面接入。
  26. 根据权利要求22至25任一项所述的装置，其特征在于，所述处理模块用于：
    根据中继选择准则和所述候选中继设备的网络接入方式，进行中继选择或中继重选；
    其中，所述中继选择准则包括第一准则或第二准则中的至少一项，所述第一准则包括所述远端设备 与所述候选中继设备之间的第二通信链路的信号质量满足第一条件，所述第二准则是所述候选中继设备满足高层准则。
  27. 根据权利要求26所述的装置，其特征在于，所述处理模块用于：
    确定满足所述中继选择准则的一个所述候选中继设备；
    基于所述候选中继设备的网络接入方式进行中继选择。
  28. 根据权利要求27所述的装置，其特征在于，所述处理模块用于：
    在所述候选中继设备的网络接入方式是地面接入的情况下，选择所述候选中继设备；在所述候选中继设备的网络接入方式为NTN接入的情况下，放弃接入所述候选中继设备；
    或，在所述候选中继设备的第一通信链路的时延信息小于或等于第一门限的情况下，选择所述候选中继设备，所述第一通信链路为所述候选中继设备与基站之间的通信链路；在所述候选中继设备的第一通信链路的时延信息大于所述第一门限的情况下，放弃接入所述候选中继设备；
    或，在所述候选中继设备的NTN小区的小区类型为地球固定类型的情况下，选择所述候选中继设备；在所述候选中继设备的网络接入方式为地球移动类型的情况下，放弃接入所述候选中继设备；
    或，在所述候选中继设备的NTN小区的剩余小区服务时间大于或等于第二门限的情况下，选择所述候选中继设备；在所述候选中继设备的NTN小区的剩余小区服务时间小于第二门限的情况下，放弃接入所述候选中继设备；
    或，在所述候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值大于或等于第二门限的情况下，选择所述候选中继设备；在所述候选中继设备的NTN小区的小区服务停止时刻与系统时间的差值小于第二门限的情况下，放弃接入所述候选中继设备。
  29. 根据权利要求26所述的装置，其特征在于，所述处理模块用于：
    确定满足所述中继选择准则的第一候选中继设备集合；
    在所述第一候选中继设备集合中，基于所述候选中继设备的网络接入方式进行中继选择。
  30. 根据权利要求29所述的装置，其特征在于，所述处理模块用于：
    在所述第一候选中继设备集合中，优先选择所述网络接入方式为所述地面接入的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择第一通信链路的时延信息小于或等于第一门限的候选中继设备，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    或，在所述第一候选中继设备集合中，优先选择第一通信链路的时延信息最小的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的小区类型为地球固定类型的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的剩余小区服务时间大于或等于第二门限的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的剩余小区服务时间最大的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的小区服务停止时刻与系统时间的差值大于或等于所述第二门限的候选中继设备；
    或，在所述第一候选中继设备集合中，优先选择所述网络接入方式为地面接入的中继设备，次优先选择所述网络接入方式为所述NTN接入且NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
  31. 根据权利要求25、28、30中任一项所述的装置，其特征在于，所述第一门限和所述第二门限中的至少一个门限是：
    预配置的；
    或，基站配置的；
    或，根据所述远端设备的类型确定的；
    或，根据所述远端设备注册的业务类型确定的。
  32. 根据权利要求26所述的装置，其特征在于，所述处理模块用于：
    确定满足所述中继选择准则的一个所述候选中继设备；
    基于所述远端设备的自身特性和所述候选中继设备的网络接入方式进行中继选择；
    其中，所述远端设备的自身特性包括：远端设备的类型和注册的业务类型中的至少一种。
  33. 根据权利要求32所述的装置，其特征在于，所述处理模块用于：
    在所述候选中继设备的网络接入方式为所述地面接入的情况下，选择所述候选中继设备；
    或，在所述候选中继设备的网络接入方式为所述NTN接入的情况下，且所述远端设备的自身特性支持NTN接入的情况下，选择所述候选中继设备。
  34. 根据权利要求26所述的装置，其特征在于，所述处理模块用于：
    确定满足所述中继选择准则的第一候选中继设备集合；
    在所述第一候选中继设备集合中，基于所述远端设备的自身特性和所述候选中继设备的网络接入方式进行中继选择；
    其中，所述远端设备的自身特性包括：远端设备的类型和注册的业务类型中的至少一种。
  35. 根据权利要求34所述的装置，其特征在于，所述处理模块用于：
    在所述第一候选中继设备集合中，优先选择所述网络接入方式为所述地面接入的候选中继设备；在所述远端设备的自身特性支持所述NTN接入的情况下，次优先选择满足第一选择条件集合中的任一种选择条件的候选中继设备；
    其中，所述第一选择条件集合包括如下选择条件中的至少一种：
    第一通信链路的时延信息小于或等于第一门限，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    所述第一通信链路的时延信息最小；
    NTN小区的小区类型为地球固定类型；
    所述NTN小区的剩余小区服务时间大于或等于第二门限；
    所述NTN小区的剩余小区服务时间最大；
    所述NTN小区的小区服务停止时刻与系统时间的差值大于或等于所述第二门限；
    所述NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
  36. 根据权利要求26所述的装置，其特征在于，所述处理模块用于：
    确定满足所述第二准则的第二候选中继设备集合；
    在所述第二候选中继设备集合中，按照所述第一准则中的筛选条件筛选出第三候选中继设备集合，所述筛选条件包括与最好的所述第二通信链路的信号质量之差在门限范围之内；
    在所述第三候选中继设备集合中，根据所述候选中继设备的网络接入方式进行中继重选。
  37. 根据权利要求36所述的装置，其特征在于，所述处理模块用于：
    在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入的候选中继设备；
    或，在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入的候选中继设备，次优先重选所述网络接入方式为NTN接入且NTN小区的小区类型为地球固定小区的候选中继设备；
    或，在所述第三候选中继设备集合中，优先重选第一通信链路的时延最小的候选中继设备；
    或，在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入的候选中继设备，次优先重选所述网络接入方式为NTN接入且所述NTN小区的剩余小区服务时间最大的候选中继设备；
    或，在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入的候选中继设备，次优先重选所述网络接入方式为NTN接入且所述NTN小区的小区服务停止时刻与系统时间之间的差值最大的候选中继设备。
  38. 根据权利要求26所述的装置，其特征在于，所述处理模块用于：
    确定满足所述第二准则的第二候选中继设备集合；
    在所述第二候选中继设备集合中，按照所述第一准则中的筛选条件筛选出第三候选中继设备集合，所述筛选条件包括与最好的所述第二通信链路的信号质量之差在门限范围之内；
    在所述第三候选中继设备集合中，优先重选所述网络接入方式为地面接入且第二通信链路的信号质量最好的候选中继设备。
  39. 根据权利要求38所述的装置，其特征在于，所述处理模块用于：
    在所述终端设备的自身特性支持所述NTN接入的情况下，次优先重选所述第三候选中继设备集合中满足第二选择条件集合中的任一种选择条件的候选中继设备；
    在所述远端设备的自身特性不支持NTN接入的情况下，重选所述第三候选中继设备集合中第二通信链路的信号质量最好的候选中继设备；
    其中，所述远端设备的自身特性包括：终端类型和注册的业务类型中的至少一种；
    所述第二选择条件集合包括如下选择条件中的至少一种：
    第一通信链路的时延信息小于或等于第一门限的候选中继设备中所述第二通信链路的信号质量最好，所述第一通信链路为所述候选中继设备与基站之间的通信链路；
    所述第一通信链路的时延信息最小；
    NTN小区的小区类型为地球固定类型的候选中继设备中所述第二通信链路的信号质量最好；
    所述NTN小区的剩余小区服务时间大于或等于第二门限的候选中继设备中所述第二通信链路的信号质量最好；
    所述NTN小区的剩余小区服务时间最大；
    所述NTN小区的小区服务停止时刻与系统时间的差值大于或等于所述第二门限的候选中继设备中所述第二通信链路的信号质量最好；
    所述NTN小区的小区服务停止时刻与系统时间的差值最大的候选中继设备。
  40. 根据权利要求36或38所述的装置，其特征在于，所述筛选条件为：
    预配置的；
    或，由基站配置的。
  41. 根据权利要求27至35任一项所述的装置，其特征在于，所述中继选择的触发条件为：
    所述远端设备的直接通信链路的信号质量低于第一阈值；
    或，所述远端设备的高层触发。
  42. 根据权利要求36至40任一项所述的装置，其特征在于，所述中继重选的触发条件为：
    所述远端设备与已连接的中继设备之间的第三通信链路的信号质量低于第二阈值；
    或，接收到第五指示信息，所述第五指示信息用于指示与已连接的中继设备断开链接；
    或，所述远端设备的高层触发；
    或，已连接的中继设备的剩余小区服务时间达到目标值；
    或，系统时间已达到所述已连接的中继设备的小区服务停止时刻。
  43. 一种远端设备，其特征在于，所述远端设备包括：
    一个或多个处理器；
    与所述一个或多个处理器相连的一个或多个收发器；
    其中，所述一个或多个处理器被配置为加载并执行可执行指令以实现如权利要求1至21任一所述的中继确定方法。
  44. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有至少一条指令，所述至少一条指令由一个或多个处理器加载并执行以实现如权利要求1至21任一所述中继确定方法。
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US9860047B1 (en) * 2015-05-12 2018-01-02 Sprint Spectrum L.P. User equipment relay selection
WO2018086451A1 (zh) * 2016-11-14 2018-05-17 中兴通讯股份有限公司 终端接入网络的方法及装置、下行数据投递方法及装置
CN112514520A (zh) * 2020-11-04 2021-03-16 北京小米移动软件有限公司 中继ue的重选方法、装置、通信设备及存储介质

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