WO2023197772A1 - 一种通信方法及相关装置 - Google Patents

一种通信方法及相关装置 Download PDF

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Publication number
WO2023197772A1
WO2023197772A1 PCT/CN2023/079450 CN2023079450W WO2023197772A1 WO 2023197772 A1 WO2023197772 A1 WO 2023197772A1 CN 2023079450 W CN2023079450 W CN 2023079450W WO 2023197772 A1 WO2023197772 A1 WO 2023197772A1
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WO
WIPO (PCT)
Prior art keywords
cell
mobile relay
network device
access network
location information
Prior art date
Application number
PCT/CN2023/079450
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English (en)
French (fr)
Inventor
朱方园
李岩
李濛
Original Assignee
华为技术有限公司
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.)
Filing date
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2023197772A1 publication Critical patent/WO2023197772A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Definitions

  • the present application relates to the field of communication, and in particular, to a communication method and related devices.
  • the access and backhaul integrated (IAB) node of the road accesses a base station serving it through a wireless interface in a terminal-like manner.
  • the base station is called the donor base station.
  • the wireless interface link between the IAB node and the donor base station is called the backhaul link ( backhaul link).
  • IAB nodes provide similar functions and services to ordinary base stations for terminals accessing their cells.
  • the communication link between IAB nodes and terminals is called access link.
  • Ordinary IAB nodes are generally fixed on the ground or in buildings and are not mobile.
  • the network can determine the location of the terminal device based on the cell information of the IAB node.
  • the mobile relay can be a vehicle mounted relay (VMR) mounted on a vehicle.
  • VMR vehicle mounted relay
  • the application of mobile relay allows terminal devices located inside or around the vehicle to access the network by connecting to the mobile relay. It can be understood that the VMR node is an IAB node with mobile capabilities.
  • the cell information of the mobile relay is configured by the operation administration and maintenance (OAM) equipment.
  • OAM operation administration and maintenance
  • the management device configures a fixed tracking area code (TAC) for the mobile relay cell, such as TAC#1.
  • TAC fixed tracking area code
  • the mobile relay is located at the first position, and the TAC included in the broadcast message sent by the mobile relay is TAC#1.
  • the TAC of the mobile relay does not change, and the TAC included in the broadcast message sent by the mobile relay is still TAC#1. Because for a terminal accessing the mobile relay, the TAC of the mobile relay accessed by the terminal is always TAC#1. Therefore, even if the mobile relay has moved to the second position, the network side may still think that the mobile relay is at the first position, and then determine that the terminal accessing the mobile relay is also near the first position. It can be seen that configuring a fixed TAC for a mobile relay will cause the network side to determine incorrect location information for terminals accessing the mobile relay.
  • This application provides a communication method and related devices, hoping that the network side can determine the accurate location information of the terminal connected to the mobile relay.
  • this application provides a communication method, which can be executed by the core network equipment, or can also be executed by components (such as chips, chip systems, etc.) configured in the core network equipment, or can also be executed by Logic modules or software implementations that can realize all or part of core network equipment functions are not limited in this application.
  • the above-mentioned core network equipment is a core network equipment serving terminal equipment.
  • the method includes: determining that the first cell accessed by the terminal device is a mobile relay cell; sending a first message to the first access network device, where the first message carries first information, and the first message is used to Requesting the first access network device to report the location information of the mobile relay.
  • the first information is used by the first access network device to determine the mobile relay.
  • the mobile relay is used to provide mediation between the terminal device and the first access network device.
  • Relay service receiving first location information of the mobile relay from the first access network device, where the first location information includes the tracking area code (tracking area code, TAC) and/or corresponding to the second cell currently accessed by the mobile relay.
  • cell identifier cell identifier, Cell ID
  • the second cell is the cell of the first access network device; based on the first location information of the mobile relay, the location information of the terminal device is determined.
  • the core network device After determining that the cell accessed by the terminal device is the cell of the mobile relay, the core network device requests the location information of the mobile relay from the access network device currently accessed by the mobile relay, and receives the location information from the access network device. After obtaining the current location information of the mobile relay of the network-connected device, the location information of the terminal device is determined based on the above-mentioned location information of the mobile relay, where the location information of the mobile relay includes the location information of the access network device currently accessed by the mobile relay. Based on the TAC and/or Cell ID corresponding to the cell, the core network device determines the location information of the terminal device by obtaining the location information of the mobile relay.
  • This application provides a method for a terminal device that accesses a mobile relay to obtain the location information of the terminal device in a mobile scenario. It solves the problem that the cell information of the mobile relay that the terminal device accesses is different from the current actual location of the terminal device. Mismatch problem, in other words, although the cell information of the mobile relay cannot reflect the actual location information of the terminal device, the core network equipment can also accurately determine the actual location of the terminal device.
  • the core network device determines that the first cell accessed by the terminal device is the cell of the mobile relay.
  • One possible implementation method is that the core network device receives the information of the first cell from the first access network device.
  • the information of the first cell includes The TAC and/or Cell ID corresponding to the first cell; based on the pre-stored configuration information and the information of the first cell, determine that the first cell is the cell of the mobile relay.
  • the configuration information includes the cell information of the mobile relay, and the cell information includes TAC and /or Cell ID, the cell information of the mobile relay includes the information of the first cell.
  • the core network device receives second information from the first access network device or the terminal device, where the second information is used to indicate that the cell accessed by the terminal device is a mobile relay cell.
  • the core network device may determine that the first cell accessed by the terminal device is a cell of the mobile relay through any of the above possible implementation methods, that is, the terminal device accesses from the mobile relay.
  • This application improves flexibility by providing multiple implementation methods for determining the cell of the mobile relay when the first cell to which the terminal device accesses is determined. It should be noted that in this application, determining that the first cell accessed by the terminal device is a mobile relay cell has the same meaning as determining that the first cell accessed by the terminal device is a cell with mobility.
  • the above method further includes: receiving second location information of the mobile relay from the second access network device, where the second location information includes the mobile relay access point.
  • the mobile relay When the mobile relay moves (the terminal device moves together with the mobile relay), for example, the mobile relay switches from the first access network device to access the second access network device, that is, accesses the second access network device.
  • the core network device can receive the second location information of the mobile relay from the second access network device, so as to accurately determine the terminal based on the current second location information of the mobile relay. The current location information of the device.
  • the core network device may also determine that the location of the terminal device has moved based on the second location information and the first location information.
  • this application provides a communication method, which can be executed by the first access network device, or can also be executed by components (such as chips, chip systems, etc.) configured in the first access network device. , or it can also be implemented by a logic module or software that can realize all or part of the functions of the first access network device, which is not limited in this application.
  • the above-mentioned first access network device is an access network device currently accessed by the mobile relay.
  • the method includes: receiving a first message from a core network device, the core network device serves the terminal device, the first message carries first information, and the first message is used to request the first access network device to report a mobile
  • the location information of the relay is used by the first access network device to determine the mobile relay.
  • the location information of the mobile relay is used by the core network device to determine the location information of the terminal device.
  • the mobile relay is used by the terminal device and the first Provide relay services between access network devices; based on the first message, send first location information of the mobile relay to the core network device, where the first location information includes the TAC and/or TAC corresponding to the second cell currently accessed by the mobile relay or Cell ID, the second cell is the cell of the first access network device.
  • the first access network device after receiving the first message from the core network device, reports the first location information of the mobile relay, that is, reports the TAC corresponding to the second cell currently accessed by the mobile relay. and/or Cell ID, so that the core network equipment can determine the location information of the terminal device based on the location information of the mobile relay.
  • the location information of the terminal device is determined through the location information of the mobile relay.
  • This application provides a method for a terminal device that accesses a mobile relay to obtain the location information of the terminal device in a mobile scenario. It solves the problem that the cell information of the mobile relay that the terminal device accesses is different from the current actual location of the terminal device. Mismatch problem, in other words, although the cell information of the mobile relay cannot reflect the actual location information of the terminal device, the core network equipment can also accurately determine the actual location of the terminal device.
  • the above method further includes: sending context information of the mobile relay to a second access network device, and the second access network device is after the mobile relay handover.
  • the access network equipment, the context information of the mobile relay includes the identification of the core network equipment.
  • the network access device sends the context information of the mobile relay to trigger the second access network device to report the current location information of the mobile relay, that is, the location information after the move, so that the core network device can obtain the current location of the mobile relay. information.
  • the above-mentioned first information includes one or more of the following: an identifier of the mobile relay; a TAC corresponding to the first cell, and the first cell is a terminal device connected to The cell of the incoming mobile relay; and the Cell ID of the first cell.
  • the first message sent by the core network device carries the first information, and the first information can be used to determine the mobile relay, that is, the first access network device can determine which mobile relay's location information to report based on the first information.
  • the first information may include one or more of the identifier of the mobile relay, the TAC corresponding to the first cell, or the Cell ID of the first cell. Based on any of the above information, the first access network device can determine which mobile device needs to be reported. Relay location information.
  • the above-mentioned first message also carries one or more of the following: a reporting period of the location information of the mobile relay, a location information type of the mobile relay, As well as the identification of the core network equipment, the location information type of the mobile relay includes the TAC and/or Cell ID of the cell to which the mobile relay accesses.
  • the core network device may indicate to the first access network device a reporting period of the location information of the mobile relay, that is, how often the location information of the mobile relay is reported.
  • the core network device can also indicate the location information type of the mobile relay to the first access network device, that is, whether the first access network device reports the TAC of the cell to which the mobile relay is connected, the Cell ID, or both. Report them all.
  • the core network device can also indicate the identity of the core network device to the first access network device.
  • the core network device is the core network device serving the terminal device, that is, it is necessary to indicate the location of the mobile relay to the first access network device. Which core network device the information is reported to.
  • the present application provides a communication method, which can be executed by the first access network device, or can also be executed by components (such as chips, chip systems, etc.) configured in the first access network device. , or it can also be implemented by a logic module or software that can realize all or part of the functions of the first access network device, which is not limited in this application.
  • the above-mentioned first access network device is an access network device currently accessed by the mobile relay.
  • the method includes: determining that the first cell accessed by the terminal device is the cell of the mobile relay; and sending the first location information of the mobile relay to the core network device serving the terminal device, where the first location information includes the mobile relay.
  • the first location information of the mobile relay is used by the core network device to determine the location information of the terminal device, and the mobile relay is used to connect the terminal device and the first access Relay services are provided between network devices, and the second cell is the cell of the first access network device.
  • the first access network device actively reports the current location information of the mobile relay to the core network device serving the terminal device, so as to facilitate the core network
  • the device determines the location information of the terminal device based on the current location information of the mobile relay, where the location information includes the TAC and/or Cell ID corresponding to the cell of the first access network device currently accessed by the mobile relay.
  • This application provides a method for a terminal device that accesses a mobile relay to obtain the location information of the terminal device in a mobile scenario. It solves the problem that the cell information of the mobile relay that the terminal device accesses is different from the current actual location of the terminal device. Mismatch problem, in other words, although the cell information of the mobile relay cannot reflect the actual location information of the terminal device, the core network equipment can also accurately determine the actual location of the terminal device.
  • a possible implementation method is that the first access network device determines the first cell based on the pre-stored configuration information and the information of the first cell.
  • the cell is the cell of the mobile relay.
  • the information of the first cell includes the TAC and/or Cell ID corresponding to the first cell.
  • the configuration information includes the cell information of the mobile relay.
  • the cell information includes the TAC and/or Cell ID of the mobile relay.
  • the cell information includes information of the first cell.
  • the first access network device receives first indication information from the mobile relay or terminal device, and the first indication information is used to indicate that the first cell is a cell with mobility, and/or the mobile Relays are mobile.
  • the first access network device may determine that the first cell accessed by the terminal device is a cell of the mobile relay through any of the above possible implementation methods, that is, the terminal device accesses from the mobile relay. This application improves flexibility by providing multiple implementation methods for determining the cell of the mobile relay when the first cell to which the terminal device accesses is determined.
  • the above method further includes: determining a reporting period and/or reporting conditions for the location information of the mobile relay, where the reporting conditions include the location information of the mobile relay accessed.
  • the cell is switched from the second cell to the third cell.
  • the second cell and the third cell are cells of the first access network equipment.
  • the TAC and/or Cell ID of the second cell and the third cell are different.
  • the first access network device can determine the reporting period of the location information of the mobile relay, that is, how often it is reported. In addition, the first access network device can also set reporting conditions, such as the TAC and/or Cell ID of the cell accessed by the mobile relay. When the above conditions are met, the first access network device can be triggered to actively report the mobile relay. Following the current location information.
  • the above method further includes: sending the TAC and/or Cell ID corresponding to the third cell to the core network device.
  • sending the first location information of the mobile relay to the core network device serving the terminal device includes: sending an N2 message to the core network device, in the N2 message Includes first location information.
  • the first access network device may carry the first location information of the mobile relay in the N2 message and send it to the core network device, so that the core network device can obtain the location information of the mobile relay.
  • the above method further includes: sending the context information of the mobile relay to the second access network device, and the second access network device is after the mobile relay handover.
  • the access network equipment, the context information of the mobile relay includes the identification of the core network equipment.
  • the network access device sends the context information of the mobile relay to trigger the second access network device to report the current location information of the mobile relay, that is, the location information after the move, so that the core network device can obtain the current location of the mobile relay. information.
  • this application provides a communication method, which can be executed by the core network equipment, or can also be executed by components (such as chips, chip systems, etc.) configured in the core network equipment, or can also be executed by Logic modules or software implementations that can realize all or part of core network equipment functions are not limited in this application.
  • the above-mentioned core network equipment is a core network equipment serving terminal equipment.
  • the method includes: receiving first location information of the mobile relay from the first access network device, where the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay,
  • the second cell is the cell of the first access network device
  • the mobile relay is used to provide relay services between the terminal device and the first access network device
  • the first cell accessed by the terminal device is the cell of the mobile relay.
  • location information of the terminal device is determined.
  • the core network device After the core network device obtains the first location information of the mobile relay reported by the first access network device, it determines the location information of the terminal device based on the first location information of the mobile relay, where the location information includes the mobile relay.
  • This application provides a method for a terminal device that accesses a mobile relay to obtain the location information of the terminal device in a mobile scenario. It solves the problem that the cell information of the mobile relay that the terminal device accesses is different from the current actual location of the terminal device. Mismatch problem, in other words, although the cell information of the mobile relay cannot reflect the actual location information of the terminal device, the core network equipment can also accurately determine the actual location of the terminal device.
  • the above method further includes: receiving an N2 message from the first access network device, where the N2 message includes the first location information of the mobile relay.
  • the above method further includes: receiving second location information of the mobile relay from the first access network device, where the second location information includes the current location of the mobile relay.
  • the third cell and the second cell are the cells of the first access network device.
  • the TAC and/or Cell ID of the third cell and the second cell are different.
  • the above method further includes: receiving third location information of the mobile relay from the second access network device, where the third location information includes the current location of the mobile relay.
  • the mobile relay When the mobile relay moves (the terminal device moves together with the mobile relay), for example, the mobile relay switches from the first access network device to access the second access network device, that is, accesses the second access network device.
  • the core network device can receive the current location information of the mobile relay from the second access network device, so as to accurately determine the current location of the terminal device based on the current location information of the mobile relay. location information.
  • the above-mentioned N2 message also includes one or more of the following: the TAC corresponding to the first cell; the Cell ID of the first cell; and the non- Access stratum (non access stratum, NAS) messages.
  • this application provides a communication device that can implement the first aspect and the method described in any possible implementation of the first aspect, or implement the second aspect and any possible implementation of the second aspect.
  • the device includes corresponding units for performing the above method.
  • the units included in the device can be implemented by software and/or hardware.
  • the present application provides a communication device, which includes a processor.
  • the processor is coupled to a memory and can be used to execute a computer program in the memory to implement the first aspect and the method described in any possible implementation of the first aspect, or to implement the second aspect and any one of the second aspects.
  • the present application provides a computer-readable storage medium in which a computer program or instructions are stored.
  • the computer program or instructions are executed, the first aspect and any of the first aspects can be implemented.
  • the method described in one possible implementation manner, or the method described in the second aspect and any possible implementation manner of the second aspect, or the third aspect and any possible implementation manner of the third aspect The method described in , or the method described in the fourth aspect and any possible implementation manner of the fourth aspect.
  • this application provides a computer program product that includes instructions that, when executed, implement the method described in the first aspect and any possible implementation of the first aspect, Or implement the second aspect and the method described in any possible implementation of the second aspect, or implement the third aspect and the method described in any possible implementation of the third aspect, or implement the fourth aspect and The method described in any possible implementation manner of the fourth aspect.
  • this application provides a chip system, which includes a processor and may also include a memory, for implementing the method described in the first aspect and any possible implementation of the first aspect, or implementing The second aspect and the method described in any possible implementation manner of the second aspect, or implement the third aspect and the method described in any possible implementation manner of the third aspect, or implement the fourth aspect and the fourth aspect Any possible implementation method described in this aspect.
  • the chip system can be composed of chips or include chips and other discrete devices.
  • FIG. 1 is a schematic diagram of the IAB network architecture provided by the embodiment of this application.
  • Figure 2 is a schematic diagram of the communication process based on IAB technology provided by the embodiment of the present application.
  • Figure 3 is a schematic diagram of the network architecture based on the service-oriented architecture provided by the embodiment of the present application.
  • Figure 4 is a schematic diagram of a network architecture based on a point-to-point interface provided by an embodiment of the present application
  • Figure 5 is a schematic diagram of the system architecture suitable for the method provided by the embodiment of the present application.
  • Figure 6 is a schematic flow chart of the first communication method provided by the embodiment of the present application.
  • Figure 7 is a detailed flow chart of the communication method shown in Figure 6 provided by the embodiment of the present application.
  • FIG 8 is another detailed flow diagram of the communication method shown in Figure 6 provided by the embodiment of the present application.
  • Figure 9 is a schematic flow chart of the second communication method provided by the embodiment of the present application.
  • Figure 10 is a detailed flow chart of the communication method shown in Figure 9 provided by the embodiment of the present application.
  • FIG 11 is another detailed flow diagram of the communication method shown in Figure 9 provided by the embodiment of the present application.
  • Figure 12 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • Figure 13 is another schematic block diagram of a communication device provided by an embodiment of the present application.
  • Figure 14 is a schematic structural diagram of an access network device provided by an embodiment of the present application.
  • the technical solutions provided by this application can be applied to various communication systems, such as 5G mobile communication systems or NR.
  • the 5G mobile communication system may include non-standalone networking (non-standalone, NSA) and/or independent networking (standalone, SA).
  • the technical solution provided by this application can also be applied to machine type communication (MTC), long term evolution-machine (LTE-M), and device to device (D2D) networks.
  • M2M machine to machine
  • IoT Internet of things
  • the IoT network may include, for example, the Internet of Vehicles.
  • the communication methods in the Internet of Vehicles system are collectively called vehicle to other devices (vehicle to X, V2X, X can represent anything).
  • the V2X can include: vehicle to vehicle (vehicle to vehicle, V2V) communication.
  • Terminal equipment can be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment , user agent or user device.
  • UE user equipment
  • access terminal user unit
  • user station mobile station
  • mobile station mobile station
  • remote station remote terminal
  • mobile device user terminal
  • terminal wireless communication equipment
  • user agent user device
  • the terminal device may be a device that provides voice/data connectivity to the user, such as a handheld device, a vehicle-mounted device, etc. with wireless connectivity capabilities.
  • some examples of terminals include: mobile phones, tablets, computers with wireless transceiver functions (such as laptops, handheld computers, etc.), mobile internet devices (MID), virtual reality (virtual reality, VR) equipment, augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical Terminals, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, smart Wireless terminals, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants, PDA), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or future evolved public land mobile communications networks , terminal equipment in PLMN), etc.
  • MID mobile internet devices
  • VR virtual reality
  • the terminal device may also be a terminal device in the IoT system.
  • IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-computer interconnection and object interconnection. IoT technology can achieve massive connections, deep coverage, and terminal power saving through narrowband (NB) technology, for example.
  • NB narrowband
  • terminal equipment can also include sensors such as smart printers, train detectors, and gas stations. Its main functions include collecting data (some terminal equipment), receiving control information and downlink data from network equipment, and sending electromagnetic waves to transmit uplink data to network equipment. .
  • Access network (AN) equipment The access network can provide network access functions for authorized users in a specific area, and can use transmission tunnels of different qualities according to the user's level, business needs, etc.
  • the access network may be an access network using different access technologies.
  • 3GPP 3rd generation partnership project
  • non-3GPP (non- 3GPP) access technology 3rd generation partnership project
  • 3GPP access technology refers to access technology that complies with 3GPP standard specifications.
  • the access network equipment in the 5G system is called next generation node base station (gNB).
  • Non-3GPP access technologies refer to access technologies that do not comply with 3GPP standard specifications, such as air interface technologies represented by access points (APs) in wireless fidelity (Wi-Fi).
  • APs access points
  • Wi-Fi wireless fidelity
  • An access network that implements access network functions based on wireless communication technology can be called a radio access network (RAN).
  • the wireless access network can manage wireless resources, provide access services to terminal devices, and then complete the forwarding of control signals and user data between the terminal and the core network.
  • Radio access network equipment may include, for example, but is not limited to: radio network controller (RNC), Node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver) station (BTS), home base station (for example, home evolved node B, or home node B, HNB), baseband unit (BBU), AP, wireless relay node, wireless backhaul node in the Wi-Fi system, Transmission point (TP) or transmission and reception point (TRP), etc., can also be gNB or transmission point (TRP or TP) in the 5G (such as NR) system, base station in the 5G system
  • RNC radio network controller
  • Node B Node B
  • BSC base
  • the radio access network equipment may include a gNB-centralized unit (CU) and a gNB-DU.
  • gNB-CU and gNB-DU are connected through the F1 interface.
  • the CU and the core network are connected through the next generation (NG) interface.
  • gNB-DU includes physical layer (PHY)/medium access control (MAC)/radio link control (RLC) layer functions, which are used to attach to the access network equipment.
  • the relay equipment provides access services.
  • gNB-DU can connect to gNB-CU through the F1 interface.
  • the gNB-DU can also be connected with the mobile terminal (mobile-termination, MT) function of the terminal device or mobile relay through the Uu interface.
  • MT mobile terminal
  • gNB-CU is used to control radio resource control (RRC) for all relay devices and terminal devices under it. For example, it can store the context of relay devices and terminal devices.
  • RRC radio resource control
  • gNB-CU can connect with the DU function of other relay devices through the F1 interface.
  • IAB node In 5G NR research, an IAB node is proposed.
  • the IAB node integrates a wireless access link and a wireless backhaul link.
  • the wireless access link is the communication between the terminal device and the IAB node.
  • Link, the wireless backhaul link is the communication link between IAB nodes, which mainly performs data backhaul.
  • After the IAB node is started, its MT function (functionality) will access the network through cell selection.
  • the IAB node does not require a wired transmission network for data return. Therefore, IAB nodes reduce the deployment requirements for wired transmission networks and can be deployed outdoors, indoors and other scenarios where it is difficult to deploy wired transmission networks.
  • the following describes the IAB network architecture and the communication process based on IAB technology in detail.
  • FIG 1 is a schematic diagram of the IAB network architecture provided by this embodiment of the present application. As shown in Figure 1, it includes 5G core network (5G core, 5GC) and NG RAN. NG-RAN supports IAB by wirelessly connecting the IAB node to the gNB that can serve the IAB node, which is named IAB-donor.
  • An IAB-host consists of an IAB-host-centralized unit (CU) and one or more IAB-host-DUs. The IAB node is connected to the upstream IAB node or IAB-host-DU via the mobile terminal function of the NR Uu port (named IAB-MT function of the IAB node).
  • 5G core 5G core
  • 5GC 5G core network
  • NG-RAN supports IAB by wirelessly connecting the IAB node to the gNB that can serve the IAB node, which is named IAB-donor.
  • An IAB-host consists of an IAB-host-centralized unit (CU) and one or more IAB-host-
  • the IAB node provides wireless backhaul to downstream IAB nodes and terminal devices through the network function of the NR Uu port (named IAB-DU function of the IAB node).
  • IAB-DU function of the IAB node named IAB-DU function of the IAB node.
  • NG, NR Uu and F1 are all logical interfaces, and the functions of each interface will not be described in detail here.
  • the IAB node can include two parts: MT and DU.
  • the MT functions similarly to the UE, communicating with the parent node through the Uu interface and providing data backhaul.
  • the DU of the IAB node is similar to the function of the DU in the gNB, including the functions of the PHY/MAC/RLC layer, communicating with the child nodes, and providing access services to the child nodes.
  • Figure 2 is a schematic diagram of a communication process based on IAB technology provided by an embodiment of the present application.
  • Step 201 The IAB node registers into the network.
  • the IAB node can initiate the registration process through the access network device to access the network.
  • the MT function of the IAB node accesses the network through cell selection.
  • step 201 includes step 2011 and step 2012.
  • Step 2011 The MT function of the IAB node sends a registration request message to the access network device.
  • the access network device receives the registration request message.
  • the MT function of the IAB node sends a registration request message to the access network device. After receiving the registration request message, the access network device can select a core network device for the MT function of the IAB node.
  • Step 2012 The access network device sends a registration request message to the selected core network device.
  • a registration request message may be sent to the core network device through an N2 message, where the above registration request message may indicate that the person requesting registration into the network is an IAB node.
  • the initial access process of the IAB node is the same as that of the conventional terminal device.
  • Step 202 The MT function of the IAB node initiates session establishment.
  • the MT function of the IAB node initiates session establishment, and then the core network device allocates an Internet Protocol (IP) address to the MT function of the IAB node.
  • IP Internet Protocol
  • the MT function of the IAB node uses this IP address to interact with OAM.
  • Step 203 OAM configures cell information for the IAB node, such as cell identity, TAC and other information.
  • cell information configured by the OAM for the IAB node is fixed. In other words, no matter where the IAB node moves, its cell information will not change. That is, the cell information of the IAB node will not change. The geographical location of the IAB node is irrelevant.
  • Step 204 The DU function of the IAB node sends an F1 configuration request (setup request) message to the host-CU.
  • the IAB node After the DU function of the IAB node selects the appropriate host radio access network (donor RAN) device, it sends an F1 configuration request message to the host-CU.
  • the F1 configuration request message carries the cell information supported by the host-CU, such as cell identification, TAC and other information.
  • the host-CU After receiving the F1 configuration request message, the host-CU activates the cell of the IAB node.
  • the donor RAN in step 204 and the access network equipment in step 201 may be the same or different, without limitation.
  • Step 205 The host-CU may send a configuration update message to the core network device. Specifically, the host-CU may send a configuration update message to the core network device through a configuration update process.
  • Step 206 The host-CU sends an F1 configuration response (setup response) message to the DU function of the IAB node.
  • the F1 configuration response message carries activated cell information (cells to be activated list), where the activated cell information includes the cell identifier of the activated cell.
  • the meaning of the IAB node registering into the network is the same as the meaning of the MT function of the IAB node registering into the network.
  • the description of the MT function execution action of the IAB node may also be replaced by the execution action of the IAB node.
  • Mobile relay refers to a wireless access network device that integrates a wireless access link and a wireless backhaul link and is mobile.
  • the wireless access link is the communication between the terminal device and the mobile relay.
  • Link, the wireless backhaul link is the communication link between the mobile relay and the wireless access network equipment deployed on the ground without mobility.
  • the wireless backhaul link mainly performs data backhaul.
  • Mobile relay supports Uu, F1, E1, NG and X2 interfaces, and includes the functions of wireless access network equipment and MT functions.
  • the MT function is integrated in the mobile relay, and this functional entity is used as the Uu port termination point of the backhaul link between the mobile relay and the host radio access network (donor RAN) device or other mobile relays. When the mobile relay is activated, the MT function will perform cell selection to access the network.
  • mobile relays are mobile.
  • a vehicle is equipped with a relay that integrates a wireless access link and a wireless backhaul link so that it can move with the movement of the vehicle.
  • This is a typical mobile relay, that is, a vehicle-mounted relay ( vehicle mounted relay, VMR).
  • Host radio access network (donor RAN) equipment usually refers to wireless access network equipment deployed on the ground without mobility, provided through the backhaul link and mobile relay between the donor RAN and the mobile relay The access link provides network access to the terminal device.
  • the host radio access network device may be composed of a CU and one or more DUs.
  • CU mainly handles non-real-time wireless high-level protocol stack functions, such as RRC layer protocol and packet data convergence protocol (PDCP) layer protocol
  • DU mainly handles PHY functions and layer 2 functions with higher real-time requirements.
  • PHY protocol CU and DU can communicate with each other through the F1 interface.
  • This application does not limit the number of mobile relays that the donor RAN can connect to.
  • this application refers to the host wireless access network device as simply the access network device.
  • the access network equipment in the embodiments of this application refers to the donor radio access network (donor RAN) equipment.
  • the network elements of the core network are introduced below.
  • Access and mobility management function (AMF) network element The AMF network element is part of the core network and is mainly used for the registration, mobility management, and tracking area update processes of terminals in the mobile network.
  • the access and mobility management network element terminates NAS messaging and is responsible for registration management, connection management and reachability.
  • TA list tracking area list
  • SM session management
  • Session management function (SMF) network element mainly used for user plane function (UPF) network element selection, UPF network element reselection, IP address allocation, session establishment, modification and release, Quality of service (QoS) control;
  • UPF user plane function
  • QoS Quality of service
  • Unified Data Management (UDM) network element Mainly used to manage contract data. When the contract data is modified, it is responsible for notifying the corresponding network element.
  • Unified Data Repository mainly used to store and retrieve contract data, policy data and public architecture data, etc.; provides UDM, policy control function (PCF) network element and network opening functions (Network exposure function, NEF) network element obtains relevant data.
  • UDR can have different data access authentication mechanisms for different types of data, such as contract data and policy data, to ensure the security of data access; UDR can return appropriate reasons for illegal service operations or data access requests. Failure response for the value.
  • Application function (AF) network element It can provide certain application layer services to terminal devices. When AF provides services to terminal devices, it has requirements for QoS and charging policies and needs to notify the network. At the same time, AF also needs the core network to feedback application-related information.
  • UPF network element Mainly used to implement all or part of the following functions: interconnecting protocol data unit (PDU) sessions with the data network; packet routing and forwarding (for example, supporting uplink classification of traffic) ) and forwarded to the data network, supporting branching points to support multi-homed PDU sessions); packet inspection, etc.
  • PDU protocol data unit
  • Figure 3 is a schematic diagram of a network architecture based on a service-oriented architecture provided by an embodiment of the present application.
  • the 5G network architecture can include three parts, namely the terminal equipment part, the data network (DN) and the operator network part.
  • the operator network may include one or more of the following network elements: Authentication Server Function (AUSF) network element, NEF network element, PCF network element, UDM network element, UDR, network storage function (network repository function (NRF) network element, AF network element, AMF network element, SMF network element, RAN network element, UPF network element, network slice selection function (NSSF) network element, network slice selection authentication and authorization Function (network slice specific authentication and authorization function, NSSAAF) network element and service communication proxy (service communication proxy, SCP) network element, etc.
  • AUSF Authentication Server Function
  • Nxxx in the figure is a service-based interface. It should be understood that for the functions of some network elements, reference can be made to the description in the network element introduction above. For details, reference can be made to known technologies, which will not be described again here.
  • Figure 4 is a schematic diagram of a network architecture based on a point-to-point interface provided by an embodiment of the present application.
  • network elements included in the network shown in Figure 4 and their related introduction please refer to the description of Figure 3 .
  • the difference between the network architecture shown in Figure 4 and Figure 3 is that in the network architecture shown in Figure 4, the interfaces between each network element are point-to-point interfaces rather than service-oriented interfaces.
  • Figure 5 is a schematic diagram of the system architecture suitable for the method provided by the embodiment of the present application.
  • the system 500 may include a core network 510, an access network device 520, a mobile relay 530 and a terminal device 540.
  • the system 500 may be, for example, a 5G system (5G system, 5GS).
  • the core network 510 may be a 5G core network (5G core, 5GC).
  • the core network 510 may include, but is not limited to, AMF, SMF, UPF, etc., and each network element may be used to implement respective functions.
  • AMF Access Management Function
  • SMF Session Management Function
  • UPF User Plane Function
  • the access network device 520 can be connected to the core network 510 and can be used to provide network access functions for authorized terminals within the coverage area, manage wireless resources, and complete the forwarding of control signals and user data between the terminal device and the core network 510.
  • the access network device 520 can not only provide wireless access services for terminal devices, but also provide wireless backhaul functions for mobile relays (mobile relays 530 as shown in Figure 5), so that The mobile relay can access the core network 510 through the access network device 520.
  • the mobile relay 530 has mobility. For example, it can be deployed in a vehicle. On the one hand, it is connected to the access network device 520 through the wireless backhaul link, and then connected to the core network 510 through the access network device 520. On the other hand, it is nearby.
  • the terminal equipment (including the terminal equipment in the vehicle or outside the vehicle that is close to it) provides a wireless access link, so that the terminal equipment can access the network.
  • the terminal device 540 shown in Figure 5 is located outside the vehicle (closer to the vehicle) and can access the mobile relay 530 through the wireless access link provided by the mobile relay 530, and then through the access network device 520 and the access network device 520.
  • the wireless backhaul link between the mobile relays 530 is connected to the core network 510.
  • Figure 5 is only an example, showing a core network, a radio access network device, a mobile relay and a terminal device, but this should not constitute any limitation on this application.
  • the quantity of each device can be one or more.
  • the number of mobile relays connected to the same wireless access network device may also be one or more.
  • the number of terminal devices accessing the same mobile relay may also be one or more.
  • the terminal device 540 may also be located inside the vehicle.
  • the current 5G system involves many scenarios where location information of terminal devices needs to be obtained.
  • capability exposure involves reporting of location information of terminal devices, such as the location report (location report) process, and the corresponding granularity of location information.
  • It can be a tracking area identity (TAI) or Cell ID.
  • TAI tracking area identity
  • LADN local area data network
  • the SMF subscribes to the terminal device mobility event notification (mobility event notification) from the AMF.
  • the granularity of the corresponding location information can be TAI, and the AMF subscribes to the corresponding location information based on the TAI and LADN.
  • the TAI list determines whether the current location of the terminal device is within the LADN service area.
  • SMF selects the session anchor point based on the location of the terminal device, and the granularity of the corresponding location information may be TAI.
  • the cell information of the mobile relay is configured by OAM.
  • OAM OAM
  • the cell information of the mobile relay may remain unchanged or cannot be updated in time, causing the cell information of the mobile relay to be inconsistent with the current geographical location. The location cannot be matched. Therefore, when the terminal device is connected to the mobile relay, the cell information of the mobile relay cannot accurately represent the actual location of the terminal device.
  • this application provides a communication method.
  • the location information of the terminal device can be determined based on the location information of the mobile relay, solving the problem of mobile communication.
  • the problem that the relayed cell information may not match the actual geographical location of the terminal device allows the core network device to accurately determine the location of the terminal device.
  • the first possible design is that after the core network device determines that the cell accessed by the terminal device is the cell of the mobile relay, it requests the location information of the mobile relay from the first access network device currently accessed by the mobile relay, and After receiving the current location information of the mobile relay from the first access network device, determine the location information of the terminal device based on the location information of the mobile relay, where the location information of the mobile relay includes the current location information of the mobile relay.
  • the TAC and/or Cell ID corresponding to the cell of the first access network device.
  • the second possible design is that after the first access network device determines that the cell accessed by the terminal device is the cell of the mobile relay, it actively reports the current location information of the mobile relay to the core network device serving the terminal device, so that The core network device determines the location information of the terminal device based on the current location information of the mobile relay, where the location information includes the TAC and/or Cell ID corresponding to the cell of the first access network device currently accessed by the mobile relay.
  • At least one refers to one or more, and “multiple” refers to two or more.
  • “And/or” describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the related objects are in an “or” relationship, but it does not exclude the situation that the related objects are in an “and” relationship. The specific meaning can be understood based on the context.
  • At least one of the following” or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items).
  • At least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a, b, and c.
  • a, b, c can be single or multiple.
  • the actions performed by the core network equipment in the embodiments described below can be specifically performed by the AMF.
  • the AMF refers to the AMF that serves the MT function of the mobile relay, that is, the MT function of the mobile relay.
  • the AMF registered when the MT accesses the network It can also be simply described as the AMF registered when the above-mentioned mobile relay enters the network.
  • the mobile relay in the embodiments described below may be a VMR, for example.
  • the access network equipment in the embodiments described below is the donor radio access network (donor RAN) equipment.
  • the second access network device described in the article receives the context information of the mobile relay from the first access network device, and it does not limit the first access network device to directly send the mobile relay to the second access network device.
  • contextual information In the N2 handover scenario, since the communication between the first access network device and the second access network device does not support the Xn interface, the communication between the first access network device and the second access network device can be through AMF to forward. In the Xn switching scenario, the Xn interface communication is supported between the first access network device and the second access network device, so the first access network device and the second access network device can interact directly without forwarding by the AMF.
  • the access network device may be the access network device 520 shown in FIG. 5
  • the core network device may be the core network device 510 shown in FIG. 5 .
  • the core network equipment can also be replaced by components (such as chips, chip systems, etc.) configured in the core network equipment, or other functional modules that can call and execute programs.
  • the access network equipment can also be replaced by components configured in the access network equipment. Components in network-connected equipment (such as chips, chip systems, etc.), or other functional modules that can call and execute programs.
  • the embodiments of the present application do not limit this.
  • the core network device determines that the cell accessed by the terminal device is the cell of the mobile relay, it sends a request to the first access network currently accessed by the relay device.
  • the device requests the location information of the mobile relay, and after receiving the current location information of the mobile relay from the first access network device, determines the location information of the terminal device based on the location information of the mobile relay,
  • the above-mentioned core network equipment is a core network equipment serving terminal equipment, and the mobile relay is used to provide relay services between the terminal equipment and the first access network equipment.
  • the first access network device is the access network device that currently provides services to the mobile relay. It can be understood as the access network device that the mobile relay is currently connected to.
  • the mobile relay will switch access network devices during the movement. In other words, there will be second access network equipment, third access network equipment, etc. to provide services for the mobile relay.
  • FIG. 6 is a schematic flow chart of the communication method 600 provided by the embodiment of the present application.
  • the method 600 shown in FIG. 6 may include steps 601 to 604. Each step in method 600 is described in detail below.
  • Step 601 The core network device determines that the first cell accessed by the terminal device is a mobile relay cell.
  • the first cell is a cell of the mobile relay that the terminal device currently accesses.
  • the first cell that the terminal device accesses is a cell of the mobile relay, which can be understood as the terminal device accesses the mobile relay, that is, the terminal device can access the network based on the mobile relay.
  • the first cell accessed by the terminal device is the cell of the mobile relay.
  • the cell information of the first cell of the mobile relay may remain unchanged or cannot be updated in time. Therefore, , when the terminal device is connected to the mobile relay, the cell information of the first cell cannot accurately represent the actual location of the terminal device. In this case, the location information of the terminal device can be determined through the method provided by this application.
  • the core network device determines that the first cell accessed by the terminal device is the mobile relay cell, which can be determined in any of the following possible ways:
  • the core network device receives the information of the first cell from the first access network device.
  • the information of the first cell includes the TAC and/or Cell ID corresponding to the first cell, and is based on the pre-stored configuration information and the first cell's information, determining that the first cell is the cell of the mobile relay, wherein the configuration information includes the cell information of the mobile relay, the cell information includes TAC and/or Cell ID, and the cell information of the mobile relay includes the information of the first cell. That is to say, the core network equipment pre-stores the cell information of the mobile relay, including TAC and/or Cell ID. The core network equipment compares the information of the first cell with the pre-stored cell information of the mobile relay. If the information of the first cell is included in the cell information of the mobile relay, then the first cell A zone is a mobile relay cell.
  • the information about the first cell received by the core network device from the first access network device may include the TAI corresponding to the first cell, the TAC may be obtained based on the above TAI, and then the TAC corresponding to the first cell and the pre-stored TAC Compared.
  • TAC, or Cell ID, or TAC and Cell ID corresponding to the cell of the mobile relay may be pre-stored in the core network equipment, and this is not limited in the embodiments of the present application.
  • Method 2 The core network device receives second information from the first access network device or the terminal device, where the second information is used to indicate that the cell accessed by the terminal device is a mobile relay cell. That is to say, the first access network device may indicate to the core network device that the cell to which the terminal device accesses is a mobile relay cell. Alternatively, the terminal device indicates to the core network device that the cell accessed by the terminal device is a mobile relay cell.
  • the first access network device preconfigures the configuration information of whether the relay device is a mobile relay. After the first access network device receives the request message from the terminal device through the mobile relay, the first access network device can send a request message to the core
  • the network equipment indicates that the cell accessed by the terminal equipment is a mobile relay cell.
  • the first access network device sends an N2 message to the core network device, and the N2 message carries indication information indicating that the cell accessed by the terminal device is a mobile relay cell.
  • the N2 message may also include an identifier of the mobile relay, and the identifier of the mobile relay is used to identify the mobile relay currently accessed by the terminal device.
  • the terminal device receives a broadcast message of the first cell, and the broadcast message carries indication information indicating that the cell is a cell of the mobile relay.
  • the broadcast message may also carry an identifier of the mobile relay.
  • the terminal device may indicate to the core network device that the cell accessed by the terminal device is a mobile relay cell.
  • the terminal device sends a registration request message to the core network device, and the registration request message carries indication information indicating that the cell accessed by the terminal device is a mobile relay cell.
  • the registration request message may also include an identifier of the mobile relay, and the identifier of the mobile relay is used to identify the mobile relay currently accessed by the terminal device.
  • Step 602 The core network device sends a first message to the first access network device.
  • the first message is used to request the first access network device to report the location information of the mobile relay.
  • the first message carries first information, and the first information is used by the first access network device to determine the mobile relay, that is, the first information is used to instruct the first access network device to report the location information of which mobile relay. .
  • the first information includes one or more of the following: the identity of the mobile relay; the TAC corresponding to the first cell; or the Cell ID of the first cell.
  • the core network device may carry any of the above information in the first message, so that the first access network device determines which mobile relay's location information to report. It should be noted that this application does not limit the content of the first information.
  • the first information may also be the identification of the terminal device. It should be understood that as long as the first access network device receives the first information and can determine the mobile relay, all within the scope of this application.
  • the core network device sends a first message to the first access network device, where the first message carries the identifier of the mobile relay to instruct the first access network device to report the current location information of the mobile relay.
  • the core network equipment can determine the identity of the mobile relay in any of the following ways:
  • Method 1 If the N2 message sent by the first access network device to the core network device contains the identifier of the mobile relay, the core network device can obtain the identifier of the mobile relay from the N2 message.
  • Method 2 The core network device determines the first cell that the terminal device accesses based on the pre-stored cell configuration information of the mobile relay (as shown in Table 1) and the TAC and/or Cell ID corresponding to the first cell that the terminal device accesses.
  • the identifier of the corresponding mobile relay For example, based on the corresponding relationship shown in Table 1, the core network device corresponds to the first cell accessed by the terminal device.
  • TAC and/or Cell ID determine the identifier of the mobile relay corresponding to the TAC and/or Cell ID of the first cell in Table 1.
  • the cell configuration information of the core network device based on the pre-stored mobile relay can be as shown in Table 1.
  • Table 1 shows the corresponding relationship between multiple mobile relay identifiers and cell information.
  • the cell information corresponding to mobile relay identifier #1 is TAC#1, Cell ID#1.
  • TAC in Table 1 can be replaced by TAI, which consists of TAC and public land mobile network (public land mobile network, PLMN).
  • PLMN public land mobile network
  • Method 3 If the terminal device sends the identity of the mobile relay to the core network device in the registration request message, the core network device can obtain the identity of the mobile relay from the registration request message.
  • the method for the first access network device to determine the mobile relay based on the first information is as follows:
  • Method 1 If the first information contains the identifier of the mobile relay, the first access network device determines the mobile relay according to the identifier of the mobile relay.
  • Method 2 If the first information contains the TAC corresponding to the first cell, the first access network device determines the mobile relay corresponding to the first cell based on the prestored cell configuration information of the mobile relay (as shown in Table 1). logo.
  • Method 3 If the first information contains the Cell ID of the first cell, the first access network device determines the mobile relay corresponding to the first cell based on the prestored cell configuration information of the mobile relay (as shown in Table 1). logo.
  • Method 4 If the first information contains the identifier of the terminal device, the first access network device determines which mobile relay the terminal device currently accesses based on the identifier of the terminal device.
  • the first message also carries one or more of the following: a reporting period of the mobile relay's location information, a location information type of the mobile relay, and an identification of the core network device.
  • the location information type of the mobile relay includes: TAC and/or Cell ID of the cell accessed by the mobile relay.
  • the core network device may also indicate to the first access network device the reporting period of the location information of the mobile relay, that is, how often the location information of the mobile relay is reported; it may also indicate the type of location information of the mobile relay, that is, to the first access network device.
  • An access network device indicates whether it needs to report the TAC of the cell accessed by the mobile relay, the Cell ID, or both; it can also indicate the identity of the core network device, that is, it indicates that the first access network device will be in the mobile relay. Which core network device should the subsequent location information be reported to?
  • the above-mentioned core network device is the core network device that serves the terminal device.
  • Step 603 The first access network device sends the first location information to the core network device.
  • the first location information is the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay
  • the second cell is the cell of the first access network device, that is, the first access network device reports the mobile The TAC and/or Cell ID corresponding to the cell of the first access network device currently accessed by the relay.
  • the first access network device after receiving the first message from the core network device, the first access network device triggers it to report the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay.
  • the first access network device may be reported through the location
  • the (location report) message carries the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay.
  • the method for the first access network device to determine the first location information may be: the first access network device determines that the cell currently accessed by the mobile relay is the second cell according to locally stored context information, and further, determines that the second cell is the second cell.
  • Community correspondence TAC and/or Cell ID may be: the first access network device determines that the cell currently accessed by the mobile relay is the second cell according to locally stored context information, and further, determines that the second cell is the second cell.
  • the type of cell information of the second cell reported by the first access network device may be indicated by the core network device.
  • Step 604 The core network device determines the location information of the terminal device based on the first location information of the mobile relay.
  • the core network device After receiving the location information of the mobile relay from the first access network device, the core network device determines the location information of the terminal device accessing the mobile relay based on the location information of the mobile relay.
  • the core network device uses the first location information of the mobile relay as the location information of the terminal device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay.
  • the core network device can use the TAC and/or Cell ID corresponding to the second cell to represent the location of the terminal device. .
  • the core network device uses the first location information of the mobile relay and the location information of the first cell of the mobile relay accessed by the terminal device as the location information of the terminal device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay
  • the location information of the first cell of the mobile relay accessed by the terminal device includes the TAC corresponding to the first cell. and/or Cell ID.
  • the core network equipment simultaneously uses the TAC and/or Cell ID corresponding to the first cell and the TAC and/or Cell ID corresponding to the second cell to represent the location of the terminal device (that is, the location information of the terminal device also includes the TAC and/or Cell ID corresponding to the first cell). or Cell ID and the second cell corresponding TAC and/or Cell ID).
  • the method 600 shown in Figure 6 further includes: the first access network device converts the identity of the mobile relay, the reporting period of the location information of the mobile relay, and the type of location information of the mobile relay carried in the first information. , and one or more of the identification of the core network device are stored in the context of the mobile relay.
  • the method 600 shown in Figure 6 also includes: the core network device stores the location information of the terminal device in the context (UE context) of the terminal device accessing the mobile relay, where the location information of the terminal device is The core network equipment is determined based on the location information of the mobile relay.
  • the core network device stores the location information of the terminal device in the context (UE context) of the terminal device accessing the mobile relay, where the location information of the terminal device is The core network equipment is determined based on the location information of the mobile relay.
  • the location information of the terminal device may be the location information of the mobile relay (such as the TAC and/or Cell ID corresponding to the cell accessed by the mobile relay).
  • the location information of the terminal device may include the location information of the mobile relay and the information of the first cell (such as the TAC and/or Cell ID corresponding to the cell accessed by the mobile relay and the TAC and/or Cell ID corresponding to the first cell).
  • Cell ID that is, the location information of the terminal device also includes the TAC and/or Cell ID corresponding to the first cell and the TAC and/or Cell ID corresponding to the second cell).
  • the method 600 shown in Figure 6 further includes: the core network device receiving second location information of the mobile relay from the second access network device, where the second location information includes a third cell accessed by the mobile relay.
  • the third cell is the cell of the second access network device; based on the received second location information, it is determined that the location of the terminal device has changed.
  • the mobile relay moves (it can be considered that the terminal device moves together with the mobile relay), and the mobile relay changes the access network equipment (such as changing the host base station), for example, during the move
  • the first access network device is switched to the second access network device, that is, the mobile relay is switched from the cell connected to the first access network device to the cell connected to the second access network device, so as to For example, when the second cell is switched to the third cell, the second access network device reports the second location information of the mobile relay to the core network device.
  • the core network device can receive the mobile relay from the second access network device.
  • the second location information includes the TAC and/or Cell ID corresponding to the third cell accessed by the mobile relay.
  • the second access network device can be triggered to report the second location information of the mobile relay to the core network device in the following manner: the second access network device receives a mobile link from the first access network device.
  • relay context Information the context information includes location reporting information (location reporting information), such as the identification of the core network device.
  • location reporting information such as the identification of the core network device.
  • the second access network device reports the TAC and/or Cell ID corresponding to the cell of the access network device currently accessed by the mobile relay.
  • the core network device After the core network device receives the second location information, it can determine that the location of the terminal device has changed based on the second location information.
  • the first location information includes the TAC and/or Cell ID of the second cell
  • the second location information includes the second location information.
  • the TAC and/or Cell ID of the three cells are different.
  • the mobile relay can switch access network equipment based on the Xn interface or the N2 interface.
  • the following will describe the process of transferring context information when the mobile relay switches based on the above two interfaces.
  • the first access network device transfers the context information of the mobile relay to the second access network device through the Xn interface.
  • the context information of the mobile relay includes, for example, the core network device.
  • identification, the core network equipment is a core network equipment serving terminal equipment.
  • the first access network device forwards the context information of the mobile relay to the second access network device through the core network device.
  • the context information of the mobile relay includes, for example, the core network The identification of the device.
  • the core network device is the core network device that serves the terminal device.
  • the first access network device sends a handover request (Handover Required) message to the AMF serving the mobile relay, where the handover request message includes the context information sent by the first access network device to the second access network device.
  • the context information can be transmitted using a source to target transparent container.
  • the context information also includes location reporting information, such as the identification of the core network device.
  • the AMF serving the mobile relay sends a handover request message to the second access network device, where the handover request message carries context information sent by the first access network device to the second access network device.
  • Figures 7 and 8 are an example of the communication method described in the embodiment shown in Figure 6.
  • the difference between the embodiments shown in Figure 7 and Figure 8 is that when the mobile relay moves and the access network device is switched, the switching is based on the Xn interface in Figure 7 and the switching is based on the N2 interface in Figure 8 .
  • the method shown in Figure 7 includes steps 701 to 719. Each step of the method shown in Figure 7 will be described in detail below. It should be understood that in the method shown in Figure 7, the mobile relay takes the VMR as an example, and the core network device takes the AMF as an example for description.
  • the AMF is the AMF of the service terminal device.
  • Step 701 The first access network device sends a broadcast message.
  • the broadcast message carries the TAC and/or Cell ID corresponding to the cell of the first access network device.
  • the MT function of the VMR selects a cell to access the first access network device and registers it in the network.
  • Step 702 The VMR obtains the configuration information of the VMR cell from the OAM and executes the cell activation process.
  • the configuration information of the VMR cell includes the TAC and/or Cell ID corresponding to the VMR cell.
  • the DU function of the VMR sends an F1 configuration request message to the first access network device to perform activation of the VMR cell. This process may refer to known technologies.
  • the VMR can send a broadcast message to the terminal device, and the broadcast message contains the information of the VMR's cell, such as TAC and/or Cell ID.
  • the broadcast message may also include indication information indicating that the cell is a mobile relay cell.
  • the terminal device accesses the VMR cell and initiates the registration process.
  • the cell currently accessed by the terminal device is the cell of the VMR (the cell of the VMR accessed by the UE is different from the cell of the first access network device accessed by the VMR). It can be understood that the VMR is mobile, and the cell of the VMR is also in a mobile state.
  • Step 703 The terminal device sends an RRC setup request (RRC setup request) message to the first access network device.
  • the first access network device receives the RRC establishment request message from the terminal device.
  • the terminal device may send an RRC establishment request message to the first access network device via the mobile relay. That is to say, the terminal device hopes to access the network through the mobile relay.
  • the first access network device may select an AMF network element for the terminal device.
  • Step 704 The first access network device sends an N2 message to the AMF.
  • the N2 message carries information about the cell (such as cell 1) accessed by the terminal device and a registration request message. For example, the TAI and/or Cell ID corresponding to the VMR cell currently accessed by the terminal device.
  • the N2 message may also carry the identification of the VMR.
  • TAI includes TAC.
  • the identifier of the VMR refers to the identifier corresponding to the VMR that the terminal device is currently connected to, and is used to identify a certain VMR.
  • the Cell ID is used to identify a cell of the VMR that the terminal device is currently connected to.
  • Step 705 AMF determines that cell 1 is a VMR cell.
  • the specific method for AMF to determine that cell 1 is a VMR cell can be:
  • Method 1 AMF receives the TAI and/or Cell ID of Cell 1 from the first access network device.
  • the AMF determines that Cell 1 is a mobile relay cell based on the pre-stored configuration information and the TAI and/or Cell ID of Cell 1.
  • Example Specifically, the configuration information stored locally by AMF is shown in Table 2.
  • the TAI of cell 1 is TAI#1, and the Cell ID is Cell ID#1.
  • AMF determines that cell 1 is a mobile relay cell.
  • the AMF pre-stored configuration information can also include the corresponding VMR ID, as shown below:
  • Table 3 shows the corresponding relationship between multiple VMR IDs and cell information.
  • the cell information corresponding to VMR ID#1 is TAI#1, Cell ID#1.
  • AMF can also obtain the above configuration information through other network elements.
  • Method 2 The AMF receives second information from the first access network device or the terminal device, where the second information is used to indicate that the cell accessed by the terminal device is a mobile relay cell. That is to say, the first access network device may indicate to the core network device that the cell to which the terminal device accesses is a mobile relay cell. Alternatively, the terminal device indicates to the core network device that the cell accessed by the terminal device is a mobile relay cell.
  • the first access network device preconfigures the configuration information of whether the relay device is a mobile relay. After the first access network device receives the request message from the terminal device through the mobile relay, the first access network device can configure the relay device in N2. The message indicates to the AMF that the cell accessed by the terminal device is a mobile relay cell.
  • the terminal device receives a broadcast message of the first cell, and the broadcast message carries a message indicating that the cell is a mobile Indicative information of the relayed cell, the terminal device indicates to the AMF in the registration request message that the cell that the terminal device accesses is the cell of the mobile relay.
  • the terminal device can also send the VMR ID to the AMF in the registration request message.
  • Step 706 The AMF sends a first message to the first access network device to request the first access network device to report the location information of the VMR.
  • the first message may be a location reporting control message (location reporting control).
  • the first message carries first information, and the first information is used to determine the mobile relay.
  • the first information includes one or more of the following: VMR ID; TAC corresponding to the first cell; or Cell ID of the first cell; or identification of the terminal device.
  • the identification of the terminal device can be represented by RAN UE NGAP ID.
  • AMF can determine the VMR ID in any of the following ways:
  • Method 1 If the N2 message contains the VMR ID, AMF can obtain the VMR ID from the N2 message.
  • Method 2 AMF determines the VMR ID corresponding to cell 1 based on the pre-stored configuration information (as shown in Table 3 above) and the TAI and/or Cell ID of cell 1.
  • Method 3 If the terminal device sends the VMR ID to the AMF in the registration request message, AMF can obtain the VMR ID from the registration request message.
  • the first access network device After receiving the first message, the first access network device determines which VMR's location information to report. For example, the method for the first access network device to determine the VMR is as follows:
  • Method 1 If the first information contains the VMR ID, the first access network device determines the VMR based on the VMR ID.
  • Method 2 If the first information contains the TAC corresponding to the first cell, the first access network device determines the VMRID corresponding to the first cell based on the prestored cell configuration information of the VMR (as shown in Table 3).
  • Method 3 If the first information contains the Cell ID of the first cell, the first access network device determines the VMR ID corresponding to the first cell based on the prestored cell configuration information of the VMR (as shown in Table 3).
  • Method 4 If the first information contains the RAN UE NGAP ID, the first access network device determines which mobile relay the terminal device is currently accessing based on the RAN UE NGAP ID.
  • Step 707 The first access network sends a location report (location report) message to the AMF.
  • the location report message carries the first location information of the VMR.
  • the first location information of the VMR may be represented by the TAI and/or Cell ID corresponding to the cell (such as cell 2) of the first access network device currently accessed by the VMR, where the TAI includes the TAC.
  • the method for the first access network device to determine the first location information may be: the first access network device determines that the cell currently accessed by the VMR is the second cell based on locally stored context information, and further determines the TAC corresponding to the second cell. and/or Cell ID.
  • Step 708, store location information.
  • Step 708 includes step 708a and step 708b.
  • Step 708a The first access network device stores the relevant information in the first message in the context of the VMR.
  • the first access network device stores the VMR ID, the reporting period of the VMR's location information, the VMR's location information type (such as TAI and/or Cell ID), and the AMF identification in the context of the VMR.
  • the VMR's location information type such as TAI and/or Cell ID
  • Step 708b The AMF determines the location information of the terminal device based on the location information of the VMR. And store it in the context of the terminal device.
  • the AMF uses the first location information of the VMR as the location information of the terminal device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the VMR, and the AMF can use the TAC and/or Cell ID corresponding to the second cell to represent the location of the terminal device.
  • the AMF uses the first location information of the VMR and the location information of the first cell of the VMR accessed by the terminal as the location information of the terminal device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the VMR
  • the location information of the first cell of the VMR accessed by the terminal includes the TAC and/or Cell ID corresponding to the first cell.
  • AMF simultaneously uses the TAC and/or Cell ID corresponding to the first cell and the TAC and/or Cell ID corresponding to the second cell to represent the location of the terminal device (that is, the location information of the terminal device also includes the TAC and/or Cell ID corresponding to the first cell). ID and the second cell corresponding to TAC and/or Cell ID).
  • Step 709 perform other steps in the registration process. You may refer to the known registration process of the terminal device, which will not be described again here.
  • Step 710 The terminal device initiates a session establishment process to trigger the establishment of a new session.
  • Step 711 The AMF sends a session establishment request message to the SMF.
  • the session establishment request message carries the location information of the terminal device. Since the AMF has obtained the location information of the VMR through the first access network device, the AMF determines the location information of the terminal device based on the location information of the VMR.
  • the location information of the terminal device carried in the session establishment request message may be the location information of the VMR currently accessed by the terminal device (ie, the information of cell 2).
  • the session establishment request message carries the TAI corresponding to cell 2 of the first access network device currently accessed by the VMR.
  • the location information of the terminal device carried in the session establishment request message may include location information of the VMR currently accessed by the terminal device and information of cell 1.
  • the session establishment request message carries the TAI corresponding to cell 2 and the TAI corresponding to cell 1 of the first access network device currently accessed by the VMR.
  • the session establishment request message may also carry indication information to instruct the SMF which TAI is the parameter of cell 1 and which TAI is the parameter of cell 2.
  • Step 712 The SMF selects a user plane network element based on the location information of the terminal device.
  • the location information of the terminal device may be the location information of the VMR (such as the TAC and/or Cell ID corresponding to the cell accessed by the VMR), or the location information of the terminal device includes the location information of the VMR and the cell accessed by the terminal device. information (such as the TAC and/or Cell ID corresponding to cell 1).
  • the SMF selects the user plane network element according to the TAI corresponding to cell 2 of the first access network device currently accessed by the VMR.
  • the SMF jointly selects the user plane network element based on the TAI corresponding to cell 2 and the TAI corresponding to cell 1 of the first access network device currently accessed by the VMR.
  • Step 713 The VMR moves, the access network equipment is replaced, and N2 handover is performed.
  • the MT function of the VMR is switched from the first access network device to the second access network device. Then, the DU function of the VMR establishes an F1 connection with the second access network device, and the second access network device activates the VMR. community. Among them, the MT function of the VMR is switched from the first access network device to the second access network device. It can be understood that the MT function of the VMR is accessed from the cell of the first access network device to the cell of the second access network device. , that is, the cell currently accessed by the VMR has changed. For example, the cell currently accessed by the VMR has changed from cell 2 of the first access network device to cell 3 of the second access network device, where the TAC corresponding to cell 2 and/or Cell ID is different from the TAC and/or Cell ID corresponding to cell 3.
  • the cell information of the VMR may not change. For example, the TAC corresponding to cell 1 remains unchanged.
  • Step 714 During the handover process, the first access network device transfers context information to the second access network device.
  • the first access network device transmits the context information of the VMR to the second access network device through the Xn interface.
  • the context information of the VMR includes location reporting information.
  • the location reporting information includes the following: One or more items: VMR identification, VMR location information reporting period, VMR location information type (such as TAI and/or Cell ID), and AMF identification, where the AMF identification refers to the AMF identification of the service terminal device.
  • Step 715 The second access network device sends a location report (location report) message to the AMF.
  • the location reporting message carries the information of the cell of the second access network device currently accessed by the VMR, such as the information of Cell 3, where the information of Cell 3 includes the TAC and/or Cell ID corresponding to Cell 3.
  • Step 716 AMF sends a terminal device movement notification to SMF.
  • the AMF Since the AMF receives the location information of the VMR from the second access network device, the location information is different from the location information received from the first access network device. AMF believes that the terminal device has moved, so it sends a terminal device mobility notification (UE mobility notification) to SMF.
  • UE mobility notification UE mobility notification
  • the notification can carry the TAI of the cell currently accessed by the VMR (the TAI corresponds to cell 3 of the second access device) .
  • the notification may also carry the TAI of the VMR cell to which the terminal device accesses.
  • the above notification carries the TAI of the cell currently accessed by the VMR (such as cell 2) and the TAI of the cell of the VMR (such as cell 1) that the terminal device accesses, in order to help the SMF distinguish the cell currently accessed by the VMR
  • the corresponding TAI and the TAI corresponding to the VMR cell to which the terminal device is accessed may also carry indication information to instruct the SMF which TAI is the parameter of Cell 1 and which TAI is the parameter of Cell 2.
  • Step 717 SMF determines whether to perform anchor point migration.
  • SMF determines whether anchor point migration needs to be performed based on the current location of the terminal device. For example, if the SMF determines that the user plane path from the previously selected anchor user plane to the N3 interface of the access network device is no longer optimal at the current location of the terminal device, the SMF may choose to perform anchor point migration. Specifically, the SMF may be The current session selects the local anchor point to route data directly to the local area, optimizing the routing path on the user plane and reducing the data transmission delay.
  • Step 718 Other network elements (such as AF or NEF) send a subscription request message to the AMF.
  • Other network elements such as AF or NEF
  • the subscription request message is used to request to subscribe to the location information of the terminal device.
  • Step 719 AMF sends the location information of the terminal device to other network elements.
  • the AMF sends the location information of the terminal device determined based on the location information of the VMR currently accessed by the terminal device to other network elements according to the subscription request message. For another example, the AMF sends the location information of the terminal device determined based on the location information of the VMR currently accessed by the terminal device and the cell information currently accessed by the terminal device to other network elements.
  • the SMF/AF/NEF in the embodiment obtains the location information of the terminal device from the AMF is just an example, and the scenario in which other network elements obtain the location information of the terminal device from the AMF is not excluded.
  • Figure 8 is an example of a communication method in a scenario of switching based on the N2 interface.
  • the difference between the embodiment shown in Figure 8 and the embodiment shown in Figure 7 lies in steps 813 to 815 in Figure 8 , and other steps are similar to Figure 7 .
  • the method shown in Figure 8 includes steps 801 to 818. Each step of the method shown in Figure 8 will be described in detail below.
  • the mobile relay takes VMR as an example
  • the core network device takes AMF as an example.
  • AMF 1 is the core network device serving the terminal device
  • AMF 2 is the core serving VMR. network equipment.
  • Step 801 The first access network device sends a broadcast message.
  • Step 802 The VMR obtains the configuration information of the VMR cell from the OAM and executes the cell activation process.
  • Step 803 The terminal device sends an RRC setup request (RRC setup request) message to the first access network device.
  • the first access network device receives the RRC establishment request message from the terminal device.
  • Step 804 The first access network device sends an N2 message to AMF 1.
  • the N2 message carries information about the cell (such as cell 1) accessed by the terminal device and a registration request message. For example, the TAI and/or Cell ID corresponding to the VMR cell currently accessed by the terminal device.
  • the N2 message can also carry the VMR ID.
  • Step 805 AMF 1 determines that cell 1 is a VMR cell.
  • Step 806 AMF 1 sends a first message to the first access network device to request the first access network device to report the location information of the VMR.
  • Step 807 The first access network device sends a location report (location report) message to the AMF 1.
  • the location report message carries the first location information of the VMR.
  • the method for the first access network device to determine the first location information may be: the first access network device determines that the cell currently accessed by the VMR is the second cell according to locally stored context information, and further determines that the second cell corresponds to TAC and/or Cell ID.
  • Step 808 store location information.
  • Step 808 includes step 808a and step 808b.
  • Step 808a The first access network device stores the relevant information in the first message in the context of the VMR.
  • Step 808b AMF 1 determines the location information of the terminal device based on the location information of the VMR. And store it in the context of the terminal device.
  • Step 809 perform other steps in the registration process. You may refer to the known registration process of the terminal device, which will not be described again here.
  • Step 810 The terminal device initiates a session establishment process to trigger the establishment of a new session.
  • Step 811 AMF 1 sends a session establishment request message to the SMF.
  • the session establishment request message carries the location information of the terminal device.
  • the location information of the terminal device carried in the session establishment request message may be the location information of the VMR currently accessed by the terminal device (ie, the information of cell 2).
  • the session establishment request message carries the TAI corresponding to cell 2 of the first access network device currently accessed by the VMR.
  • the location information of the terminal device carried in the session establishment request message may include location information of the VMR currently accessed by the terminal device and information of cell 1.
  • the location information of the terminal device carried in the session establishment request message includes the TAI corresponding to cell 2 and the TAI corresponding to cell 1 of the first access network device currently accessed by the VMR.
  • the session establishment request message may also carry indication information to instruct the SMF which TAI is the parameter of cell 1 and which TAI is the parameter of cell 2. .
  • Step 812 The SMF selects a user plane network element based on the location information of the terminal device.
  • step 801 to step 812 can be referred to the description in FIG. 7 and will not be described again here.
  • Step 813 The VMR moves, the access network equipment is replaced, and N2 handover is performed.
  • the MT function of the VMR is switched from the first access network device to the second access network device, and then the DU function of the VMR establishes an F1 connection with the second access network device and is activated by the second access network device.
  • VMR's community the MT function of the VMR is switched from the first access network device to the second access network device.
  • the MT function of the VMR is accessed from the cell of the laundry access network device to the cell of the second access network device. That is, the cell currently accessed by the VMR has changed. For example, the cell currently accessed by the VMR has changed from cell 2 of the first access network device to cell 3 of the second access network device.
  • the TAC corresponding to cell 2 and /or the Cell ID is different from the corresponding TAC and/or Cell ID of cell 3.
  • the cell information of the VMR may not change. For example, the TAC corresponding to cell 1 remains unchanged.
  • Step 814 During the handover process, the first access network device sends a handover request message to AMF 2, and the handover request message carries context information.
  • the first access network device sends a handover request (Handover Required) message to the AMF 2 serving the VMR.
  • the handover request message contains context information sent by the first access network device to the second access network device.
  • the context information Information can be transmitted using a source to target transparent container, and the context information also includes location reporting information, such as the AMF 1 identification.
  • Step 815 AMF 2 sends a handover request message to the second access network device, where the handover request message carries context information.
  • Step 816 The second access network device sends a location report (location report) message to AMF 1.
  • the location reporting message carries the information of the cell of the second access network device currently accessed by the VMR, such as the information of cell 3, where the information of cell 3 includes the TAI and/or Cell ID corresponding to cell 3.
  • Step 817 AMF 1 sends a terminal device movement notification to SMF.
  • Step 818 SMF determines whether to perform anchor point migration.
  • step 817 and step 818 please refer to the embodiment shown in FIG. 7 and will not be described in detail here.
  • the SMF/AF/NEF in the embodiment obtains the location information of the terminal device from the AMF is just an example, and the scenario in which other network elements obtain the location information of the terminal device from the AMF is not excluded.
  • the core network device After determining that the cell accessed by the terminal device is the cell of the mobile relay, the core network device requests the location information of the mobile relay from the access network device currently accessed by the mobile relay, and receives the location information from the access network device. After obtaining the current location information of the mobile relay of the access network device, the location information of the terminal device is determined based on the location information of the mobile relay, where the location information includes the TAC corresponding to the cell of the access network device currently accessed by the mobile relay. and/or Cell ID. The core network device determines the location information of the terminal device by obtaining the location information of the mobile relay.
  • This application provides a method for a terminal device accessing the mobile relay to obtain the terminal device in a mobile scenario.
  • the location information method solves the problem that the cell information of the mobile relay accessed by the terminal device does not match the current actual location of the terminal device. In other words, although the cell information of the mobile relay cannot reflect the actual location information of the terminal device , the core network equipment can also accurately determine the actual location of the terminal equipment.
  • the first access network device determines that the cell accessed by the terminal device is a mobile relay. After entering the cell, actively report the current location information of the mobile relay to the core network equipment serving the terminal equipment, so that the core network equipment can determine the location information of the terminal equipment based on the current location information of the mobile relay.
  • the location information includes the mobile relay.
  • the above-mentioned core network equipment is a core network equipment serving terminal equipment, and the mobile relay is used to provide relay services between the terminal equipment and the first access network equipment.
  • the first access network device is the access network device that currently provides services to the mobile relay. It can be understood as the access network device that the mobile relay is currently connected to.
  • the mobile relay will switch access network devices during the movement. In other words, there will be second access network equipment, third access network equipment, etc. to provide services for the mobile relay.
  • Figure 9 is a schematic flow chart of the communication method 900 provided by the embodiment of the present application.
  • the method 900 shown in Figure 9 may include steps 901 to 903. Each step in method 900 is described in detail below.
  • Step 901 The first access network device determines that the first cell accessed by the terminal device is a mobile relay cell.
  • the first cell is a cell of the mobile relay that the terminal device currently accesses.
  • the first cell that the terminal device accesses is a cell of the mobile relay, which can be understood as the terminal device accesses the mobile relay, that is, the terminal device can access the network based on the mobile relay.
  • the first cell accessed by the terminal device is the cell of the mobile relay.
  • the cell information of the first cell of the mobile relay may remain unchanged or cannot be updated in time. That is, the cell information of the mobile relay cell cannot match the location of the terminal device.
  • the location information of the terminal device can be determined through the method provided by this application.
  • the first access network device determines that the first cell accessed by the terminal device is a mobile relay cell, which can be determined in any of the following possible ways:
  • Method 1 The first access network device determines that the first cell is a cell of the mobile relay based on the pre-stored configuration information and the information of the first cell, where the information of the first cell includes the TAC and/or Cell corresponding to the first cell. ID, the pre-stored configuration information includes the cell information of the mobile relay, the cell information includes TAC and/or Cell ID, and the cell information of the mobile relay includes the information of the first cell. In other words, the first access network device pre-stores the cell information of the mobile relay, including TAC and/or Cell ID. The first access network device compares the information of the first cell with the pre-stored cell information of the mobile relay.
  • the configuration information prestored by the first access network device may refer to the cell configuration information of the mobile relay prestored by the AMF shown in Table 2.
  • TAC, or Cell ID, or TAC and Cell ID corresponding to the cell of the mobile relay may be pre-stored in the first access network device, and this is not limited in the embodiment of the present application.
  • the first access network device receives first indication information from the mobile relay or the terminal device.
  • the first indication information is used to indicate that the first cell is a cell with mobility, and/or the mobile relay has mobility.
  • the terminal device may indicate to the first access network device that the cell to which the terminal device accesses is a cell with mobility.
  • the terminal device indicates to the first access network device in the RRC message that the cell accessed by the terminal device is a cell with mobility.
  • the mobile relay indicates to the first access network device that the mobile relay has mobility.
  • the F1 setup request (F1setup request) message sent by the mobile relay to the first access network device carries indication information that the mobile relay has mobility.
  • any of the above methods can cause the first access network device to determine that the first cell accessed by the terminal device is a mobile relay cell. That is, any of the above methods can trigger the first access network device to Report the location information of the mobile relay to the core network equipment.
  • the first access network device can also use other methods to determine that the first cell accessed by the terminal device is a mobile relay cell. For example, the first access network device can also obtain which relay devices in the network are mobile relays through OAM configuration. . Therefore, this application does not limit the specific implementation manner in which the first access network device determines that the first cell accessed by the terminal device is a mobile relay cell.
  • Step 902 The first access network device sends the first location information of the mobile relay to the core network device.
  • the first location information is the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay
  • the second cell is the cell of the first access network device, that is, the first access network device reports the mobile Relay the TAC and/or Cell ID corresponding to the second cell of the first access network device currently accessed.
  • the method for the first access network device to determine the first location information may be: the first access network device determines that the cell currently accessed by the mobile relay is the second cell according to locally stored context information, and further, determines that the second cell is the second cell.
  • the first access network device determines that the first cell accessed by the terminal device is the cell of the mobile relay, it actively reports the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay.
  • the first access network device sends the first location information of the mobile relay to the core network device serving the terminal device, including: sending an N2 message to the core network device, the N2 message including the first location information.
  • the first access network device may carry the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay in the N2 message and send it to the core network device.
  • the N2 message also includes one or more of the following: TAC corresponding to the first cell; Cell ID of the first cell; or NAS message of the terminal device.
  • the NAS message includes: registration request message, registration update request message or service request message.
  • the N2 message carries the mobile relay identity, the first location information (such as the TAC and/or Cell ID corresponding to the second cell), the TAC and/or Cell ID corresponding to the mobile relay currently accessed by the terminal device. Cell ID etc.
  • the mobile relay identifier is used to identify the mobile relay currently accessed by the terminal device.
  • the N2 message also contains a registration request message of the terminal device.
  • one implementation method is that when the first access network device receives the NAS message from the terminal device, the first access network device sends an N2 message to the core network device, and the N2 message carries the NAS message (such as Registration request message), the TAC and/or Cell ID corresponding to the cell of the mobile relay currently accessed by the terminal device, and the first location information of the mobile relay. That is, when the first access network device can receive the NAS message from the terminal device, it also sends the NAS message and the first location information of the mobile relay to the core network device.
  • the NAS message such as Registration request message
  • the first access network device may also send the first location information of the mobile relay to the core network device. That is, the first access network device does not rely on receiving the NAS message from the terminal device, but can directly send the first location information of the mobile relay to the core network device.
  • the N2 message may contain the TAC and/or Cell ID corresponding to the cell (such as the second cell) accessed by the mobile relay, and the TAC and/or Cell ID of the first cell accessed by the terminal device.
  • the N2 message may also carry indication information to indicate which TAC and/or Cell ID.
  • Cell ID is the parameter of the first cell, which TAC and/or Cell ID is the parameter of the second cell. In this way, the core network device can distinguish multiple TACs and/or Cell IDs carried in the N2 message.
  • the N2 message carries an information element used to identify user location information (URL).
  • the URL is used to represent the location information of the terminal device.
  • the URL includes the first TAC and/or Cell ID corresponding to the cell.
  • the N2 message also carries an information element used to identify the location information (VMRLI) of the mobile relay.
  • the VMRLI is used to identify the location information of the mobile relay.
  • the VMRLI contains the location information corresponding to the second cell. TAC and/or Cell ID. After the core network device receives the URL and VMRLI, it can distinguish which parameters are the parameters of the first cell (that is, the parameters included in the URL). Which TAC and/or Cell ID are the parameters of the second cell (ie, the parameters included in the VMRLI).
  • the N2 message carries information elements used to identify the URL.
  • the URL is used to identify the location information of the terminal device.
  • the URL includes the TAC and/or Cell ID corresponding to the first cell, the second The TAC and/or Cell ID and indication information corresponding to the cell.
  • the indication information is used to indicate that the TAC and/or Cell ID corresponding to the second cell is the TAC and/or Cell corresponding to the second cell (such as cell 2) of the first access network device currently accessed by the VMR currently accessed by the terminal device. ID.
  • the core network device After the core network device receives the URL, it can distinguish which parameters in the URL are the parameters of the first cell and which are the parameters of the second cell.
  • Step 903 The core network device determines the location information of the terminal device based on the first location information of the mobile relay.
  • the core network device After receiving the location information of the mobile relay from the first access network device, the core network device determines the location information of the terminal device accessing the mobile relay based on the location information of the mobile relay.
  • the core network device uses the location information of the mobile relay as the location information of the terminal device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay.
  • the core network device can use the TAC and/or Cell ID to represent the location of the terminal device.
  • the core network device uses the first location information of the mobile relay and the location information of the first cell of the mobile relay accessed by the terminal as the location information of the terminal device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay
  • the location information of the first cell of the mobile relay accessed by the terminal includes the TAC and/or Cell ID corresponding to the first cell. /or Cell ID.
  • the core network equipment simultaneously uses the TAC and/or Cell ID corresponding to the first cell and the TAC and/or Cell ID corresponding to the second cell to represent the location of the terminal device (that is, the location information of the terminal also includes the TAC and/or Cell ID corresponding to the first cell). Cell ID and the second cell corresponding to TAC and/or Cell ID).
  • the method 900 shown in Figure 9 also includes: the first access network device transmits the identity of the mobile relay, the reporting period of the location information of the mobile relay, the location information type of the mobile relay, and the location information of the core network device.
  • the identifiers are stored in the context of the mobile relay.
  • the location information type of the mobile relay includes the TAC and/or Cell ID corresponding to the cell accessed by the mobile relay.
  • the method 900 shown in Figure 9 also includes: the core network device stores the location information of the terminal device in the context of the terminal device, where the location information of the terminal device is determined by the core network device based on the location information of the mobile relay. of.
  • the location information of the terminal device may be the location information of the mobile relay (such as the TAC and/or Cell ID corresponding to the cell accessed by the mobile relay).
  • the location information of the terminal device may include the location information of the mobile relay and the information of the first cell (such as the TAC and/or Cell ID corresponding to the cell accessed by the mobile relay and the TAC and/or Cell ID corresponding to the first cell). Cell ID).
  • the method 900 shown in Figure 9 also includes: the first access network device may also determine a reporting period and/or reporting conditions for the location information of the mobile relay, where the reporting conditions include a cell accessed by the mobile relay. From the second cell to the third cell, the second cell and the third cell are cells of the first access network equipment, and the TAC and/or Cell ID of the second cell and the third cell are different.
  • the mobile relay may be switched from a certain cell of the first access network device to another cell of the first access network device, and the TAC and/or Cell ID of the two cells Differently, in this case, the first access network device can report the TAC and/or Cell ID corresponding to the cell currently accessed by the mobile relay to the core network device.
  • the first access network device determines that the mobile relay is switched from cell 2 to cell 3, and both cell 2 and cell 3 is the cell of the first access network device, and the TAC and/or Cell ID of cell 2 and cell 3 are different, then the first access network device can report the current second location information of the mobile relay through the location reporting message, that is, the cell 3 corresponding TAC and/or Cell ID.
  • the core network device receives the current second location information of the mobile relay from the first access network device, that is, the TAC and/or Cell ID corresponding to cell 3.
  • the cell information of the mobile relay may not change, for example The TAC corresponding to cell 1 remains unchanged.
  • the method 900 shown in Figure 9 further includes: the core network device receiving third location information of the mobile relay from the second access network device, where the third location information includes the fourth location currently accessed by the mobile relay.
  • the fourth cell is the cell of the second access network device.
  • the second access network device sends the third location information of the mobile relay to the core network device.
  • the mobile relay moves (it can be considered that the terminal device moves together with the mobile relay), and the mobile relay changes the access network equipment (such as changing the host base station), for example, during the move
  • the first access network device is switched to the second access network device, that is, the mobile relay is switched from the cell connected to the first access network device to the cell connected to the second access network device, so as to Taking cell 2 to cell 4 as an example, the second access network device reports the third location information of the mobile relay to the core network device.
  • the core network device can receive the third location information of the mobile relay from the second access network device.
  • the third location information includes the TAC and/or Cell ID corresponding to cell 4 accessed by the mobile relay.
  • first location information, the second location information, the third location information, etc. in the embodiments of this application are used as an example to distinguish the location information corresponding to different cells. Their meanings are similar, and they all refer to the current access of the mobile relay.
  • the second access network device can be triggered to report the second location information of the mobile relay to the core network device in the following manner: the second access network device receives a mobile link from the first access network device. Context information of the relay, which includes location reporting information, such as the identification of the core network device. After receiving the context information of the mobile relay, the second access network device reports the TAC and/or Cell ID corresponding to the cell of the access network device currently accessed by the mobile relay.
  • the core network device receives the current location information of the mobile relay and can determine whether the location of the terminal device has changed. For example, the location information of the mobile relay from the first access network device received by the core network device includes the location information corresponding to cell 2. TAC and/or Cell ID. The location information of the mobile relay received from the second access network device includes the TAC and/or Cell ID corresponding to cell 4. If the two are different, it can be determined that the location of the mobile relay has changed. , that is, the position of the terminal device that moves together with the mobile relay changes.
  • the mobile relay can switch access network equipment based on the Xn interface or the N2 interface.
  • the following will describe the process of transferring context information when the mobile relay switches based on the above two interfaces.
  • the first access network device transfers the context information of the mobile relay to the second access network device through the Xn interface.
  • the context information of the mobile relay includes, for example, the core network device.
  • identification, the core network equipment is a core network equipment serving terminal equipment.
  • the first access network device forwards the context information of the mobile relay to the second access network device through the core network device.
  • the context information of the mobile relay includes, for example, the core network The identification of the device.
  • the core network device is the core network device that serves the terminal device.
  • the first access network device sends a handover request message to the AMF serving the mobile relay, where the handover request message
  • the request message contains context information sent by the first access network device to the second access network device.
  • the context information can be transmitted using a source to target transparent container.
  • the context information also includes the location report. Information, such as the identification of core network equipment.
  • the AMF serving the mobile relay sends a handover request message to the second access network device, where the handover request message carries context information sent by the first access network device to the second access network device.
  • FIG. 10 and FIG. 11 are an example of the communication method described in the embodiment shown in FIG. 9 .
  • the difference between the embodiments shown in Figure 10 and Figure 11 is that when the mobile relay moves and the access network device is switched, the switching is based on the Xn interface in Figure 10 and the switching is based on the N2 interface in Figure 11 .
  • the method shown in Figure 10 includes steps 1001 to 1019. Each step of the method shown in Figure 10 will be described in detail below.
  • the mobile relay takes the VMR as an example
  • the core network device takes the AMF as an example for description.
  • the AMF is the AMF of the service terminal device.
  • Step 1001 The first access network device sends a broadcast message.
  • the broadcast message carries the TAC and/or Cell ID corresponding to the cell of the first access network device.
  • the MT function of the VMR selects a cell to access the first access network device and registers it in the network.
  • Step 1002 The VMR obtains the configuration information of the VMR cell from the OAM and executes the cell activation process.
  • the configuration information of the VMR cell includes the TAC and/or Cell ID corresponding to the VMR cell.
  • the DU function of the VMR sends an F1 configuration request message to the first access network device to perform activation of the VMR cell. This process may refer to known technologies.
  • the VMR can send a broadcast message to the terminal device.
  • the broadcast message contains the information of the VMR's cell, such as TAC and/or Cell ID.
  • the broadcast message may also include indication information indicating that the cell is a mobile relay cell.
  • the terminal device accesses the VMR cell and initiates the registration process.
  • the cell currently accessed by the terminal device is the cell of the VMR (the cell of the VMR accessed by the UE is different from the cell of the first access network device accessed by the VMR). It can be understood that the VMR is mobile, and the cell of the VMR is also in a mobile state.
  • Step 1003 The terminal device sends an RRC establishment request message to the first access network device.
  • the first access network device receives the RRC establishment request message from the terminal device.
  • the terminal device may send an RRC establishment request message to the first access network device via the mobile relay. That is to say, the terminal device hopes to access the network through the mobile relay.
  • the first access network device may select an AMF network element for the terminal device.
  • Step 1004 The first access network device determines that the terminal device accesses from the VMR.
  • the first access network device determines that the cell (such as cell 1) accessed by the terminal device is a VMR cell.
  • the first access network device can determine that cell 1 is a VMR cell in any of the following ways:
  • Method 1 The first access network device determines that the first cell is a cell of the mobile relay based on the pre-stored configuration information and the information of the first cell, where the information of the first cell includes the TAC and/or Cell corresponding to the first cell. ID, the pre-stored configuration information includes the cell information of the mobile relay, the cell information includes TAC and/or Cell ID, and the cell information of the mobile relay includes the information of the first cell. In other words, the first access network device pre-stores the cell information of the mobile relay, including TAC and/or Cell ID. The first access network device compares the information of the first cell with the pre-stored cell information of the mobile relay. If If the information of a cell is included in the cell information of the mobile relay, it is determined that the first cell is the cell of the mobile relay.
  • the first access network device receives the first indication information from the VMR or the terminal device.
  • the first indication information It is used to indicate that the first cell is a cell with mobility, and/or the mobile relay has mobility.
  • the terminal device may indicate to the first access network device that the cell to which the terminal device accesses is a cell with mobility.
  • the terminal device indicates to the first access network device in the RRC message that the cell accessed by the terminal device is a cell with mobility.
  • the VMR may indicate to the first access network device that the mobile relay has mobility.
  • the F1 setup request (F1setup request) message sent by the VMR to the first access network device carries indication information that the VMR has mobility.
  • the first access network device can also configure the location information reporting cycle or reporting conditions of the VMR.
  • the location information reporting cycle of the VMR refers to how often the first access network device needs to report the location information of the VMR.
  • the reporting conditions are It means that when the configured reporting conditions are met, the first access network device needs to report the location information of the VMR to the AMF of the service terminal device.
  • Condition 1 The TAC corresponding to the cell of the access network device connected to the VMR has changed.
  • the VMR is connected from the second cell of the first access network device to the third cell of the first access network device, and the TACs of the second cell and the third cell are different.
  • Condition 2 The Cell ID corresponding to the cell of the access network equipment connected to the VMR has changed.
  • VMR is connected from the second cell of the first access network device to the third cell of the first access network device, and the Cell IDs of the second cell and the third cell are different.
  • Step 1005 The first access network device sends an N2 message to the AMF, where the N2 message carries the first location information of the VMR.
  • the first location information of the VMR includes the TAC and/or Cell ID corresponding to the second cell (such as cell 2) of the first access network device currently accessed by the VMR.
  • the method for the first access network device to determine the first location information may be: the first access network device determines that the cell currently accessed by the VMR is the second cell based on locally stored context information, and further determines the TAC corresponding to the second cell. and/or Cell ID.
  • the N2 message may also carry the VMR identifier, the registration request message, and the TAC and/or Cell ID corresponding to the VMR cell to which the terminal device accesses.
  • the VMR identifier refers to the identifier corresponding to the VMR currently accessed by the terminal device, and is used to identify a certain VMR.
  • One possible implementation is that when the first access network device receives the NAS message from the terminal device, the first access network device sends an N2 message to the AMF, and the N2 message carries the NAS message (such as a registration request message). , the TAC and/or Cell ID corresponding to the cell of the VMR currently accessed by the terminal device, and the first location information of the VMR. That is, when the first access network device can receive the NAS message from the terminal device, it sends the NAS message and the first location information of the VMR to the AMF.
  • the first access network device can receive the NAS message from the terminal device, it sends the NAS message and the first location information of the VMR to the AMF.
  • the first access network device can also send the first location information of the VMR to the AMF. That is, the first access network device does not rely on receiving the NAS message from the terminal device and can directly send the first location information of the VMR to the AMF.
  • the N2 message may contain the TAC and/or Cell ID corresponding to the cell (such as the second cell) accessed by the VMR, and the TAC and/or Cell ID of the first cell accessed by the terminal device.
  • the N2 message can also carry indication information to indicate which TAC and/or Cell ID is a parameter of the first cell, which TAC and/or Cell ID is a parameter of the second cell. In this way, AMF can distinguish multiple TACs and/or Cell IDs carried in the N2 message.
  • the N2 message carries an information element representing a URL
  • the URL is used to represent Displays the location information of the terminal device.
  • the URL contains the TAC and/or Cell ID corresponding to the first cell.
  • the N2 message also carries an information element used to represent the VMRLI.
  • the VMRLI is used to represent the location information of the mobile relay.
  • the VMRLI includes the TAC and/or Cell ID corresponding to the second cell.
  • the N2 message carries an information element used to represent the user location information (URL, User Location Information).
  • the URL is used to represent the location information of the terminal device.
  • the URL contains the location information corresponding to the first cell. TAC and/or Cell ID, TAC and/or Cell ID corresponding to the second cell, and indication information.
  • the indication information is used to indicate that the TAC and/or Cell ID corresponding to the second cell is the TAC and/or Cell corresponding to the second cell (such as cell 2) of the first access network device currently accessed by the VMR currently accessed by the terminal device. ID.
  • AMF After AMF receives the URL, it can distinguish which parameters in the URL are the parameters of the first cell and which are the parameters of the second cell.
  • Step 1006 perform other steps in the registration process. You may refer to the known registration process of the terminal device, which will not be described again here.
  • Step 1007 The first access network device sends a location report (location report) message to the AMF.
  • the VMR has moved.
  • the MT function of the VMR is accessed from the second cell of the first access network device to the third cell of the first access network device. That is, if the reporting conditions are met, the first access network device actively initiates location reporting. Process, sending VMR current location information to AMF.
  • the first access network device sends a location report message to the AMF, carrying the current location information of the VMR.
  • the current location information of the VMR can be represented by the TAC and/or Cell ID corresponding to the cell currently accessed by the VMR. .
  • Step 1008 The terminal device initiates a session establishment process.
  • Step 1009 The AMF sends a session establishment request message to the SMF.
  • the session establishment request message carries the location information of the terminal device. Since the AMF has obtained the location information of the VMR through the first access network device, the AMF determines the location information of the terminal device based on the location information of the VMR.
  • the location information of the terminal device carried in the session establishment request message may be the location information of the VMR currently accessed by the terminal device (ie, the information of cell 2).
  • the session establishment request message carries the TAI corresponding to cell 2 of the first access network device currently accessed by the VMR.
  • the session establishment request message may also carry indication information to instruct the SMF which TAI is the parameter of cell 1 and which TAI is the parameter of cell 2. .
  • the location information of the terminal device carried in the session establishment request message includes the location information of the VMR currently accessed by the terminal device and the information of cell 1.
  • the session establishment request message carries the TAI corresponding to cell 2 and the TAI corresponding to cell 1 of the first access network device currently accessed by the VMR.
  • Step 1010 The SMF selects a user plane network element based on the location information of the terminal device. For example, the SMF selects the user plane network element according to the TAC corresponding to the cell of the first access network device currently accessed by the VMR. For another example, the SMF selects the user plane network element based on the TAC corresponding to the cell of the first access network device currently accessed by the VMR and the TAC corresponding to the cell of the VMR accessed by the terminal device.
  • Step 1011 The VMR moves, the access network equipment is replaced, and Xn handover is performed.
  • the MT function of the VMR is switched from the first access network device to the second access network device, and then, the VMR The DU function establishes an F1 connection with the second access network device, and the second access network device activates the VMR cell.
  • the MT function of the VMR is switched from the first access network device to the second access network device.
  • the MT function of the VMR is accessed from the cell of the first access network device to the cell of the second access network device. , that is, the cell currently accessed by the VMR has changed. For example, the cell currently accessed by the VMR has changed from cell 2 of the first access network device to cell 4 of the second access network device, where the TAC corresponding to cell 2 and/or Cell ID is different from the TAC and/or Cell ID corresponding to cell 4.
  • the cell information of the mobile relay may not change, for example The TAC corresponding to cell 1 remains unchanged.
  • Step 1012 During the handover process, the first access network device transfers context information to the second access network device.
  • the first access network device transmits the context information of the VMR to the second access network device through the Xn interface.
  • the context information of the VMR includes location reporting information.
  • the location reporting information includes the following: One or more items: VMR identification, VMR location information reporting period, VMR location information type (such as TAI and/or Cell ID), and AMF identification, where the AMF identification refers to the AMF identification of the service terminal device.
  • Step 1013 The second access network device sends a location report (location report) message to the AMF.
  • the location reporting message carries information about the cell of the second access network device currently connected to the VMR, such as TAC and/or Cell ID.
  • Step 1014 AMF sends a terminal device movement notification to SMF.
  • the AMF Since the AMF receives the location information of the VMR from the second access network device, the location information is different from the location information received from the first access network device.
  • the AMF believes that the terminal equipment has moved, so it sends a terminal equipment mobility notification (UE mobility notification) to the SMF.
  • the notification can carry the TAC of the cell (such as cell 4) currently accessed by the VMR (the TAC is the same as the second accessed cell).
  • the notification may also carry the TAI of the VMR cell (such as cell 1) to which the terminal device accesses.
  • the above notification carries the TAI of the cell currently accessed by the VMR (such as cell 4) and the TAI of the cell of the VMR (such as cell 1) that the terminal device accesses, in order to help the SMF distinguish the cell currently accessed by the VMR
  • the above notification may also carry indication information to instruct the SMF which TAI is the parameter of cell 1 and which TAI is the parameter of cell 4.
  • Step 1015 SMF determines whether to perform anchor point migration.
  • SMF determines whether anchor point migration needs to be performed based on the current location of the terminal device. For example, if the SMF determines that the user plane path from the previously selected anchor user plane to the N3 interface of the access network device is no longer optimal at the current location of the terminal device, the SMF may choose to perform anchor point migration. Specifically, the SMF may be The current session selects the local anchor point to route data directly to the local area, optimizing the routing path on the user plane and reducing the data transmission delay.
  • Figure 11 is an example of a communication method in a scenario of switching based on the N2 interface.
  • the difference between the embodiment shown in Fig. 11 and the embodiment shown in Fig. 10 lies in steps 1110 to 1112 in Fig. 11, and other steps are similar to Fig. 10.
  • the method shown in Figure 11 includes steps 1101 to 1115. Each step of the method shown in Figure 11 will be described in detail below.
  • the mobile relay takes VMR as an example
  • the core network device takes AMF as an example.
  • AMF 1 is the core network device serving the terminal device
  • AMF 2 is the core serving VMR. network equipment.
  • Step 1101 The first access network device sends a broadcast message.
  • Step 1102 The VMR obtains the configuration information of the VMR cell from the OAM and executes the cell activation process.
  • Step 1103 The terminal device sends an RRC establishment request message to the first access network device.
  • the first access network device receives the RRC establishment request message from the terminal device.
  • Step 1104 The first access network device determines that the terminal device accesses from the VMR.
  • the first access network device determines that the cell (such as cell 1) accessed by the terminal device is a VMR cell.
  • Step 1105 The first access network device sends an N2 message to AMF 1.
  • the N2 message carries the first location information of the VMR.
  • the method for the first access network device to determine the first location information may be: the first access network device determines that the cell currently accessed by the mobile relay is the second cell according to locally stored context information, and further, determines that the second cell is the second cell.
  • Step 1106 perform other steps in the registration process. You may refer to the known registration process of the terminal device, which will not be described again here.
  • Step 1107 The first access network device sends a location report (location report) message to AMF 1.
  • the VMR has moved.
  • the MT function of the VMR is accessed from the second cell of the first access network device to the third cell of the first access network device. That is, if the reporting conditions are met, the first access network device actively initiates location reporting.
  • the cell information of the mobile relay may not change, for example The TAC corresponding to cell 1 remains unchanged.
  • Step 1108 The terminal device initiates a session establishment process.
  • Step 1109 AMF 1 sends a session establishment request message to the SMF.
  • the session establishment request message carries the location information of the terminal device.
  • step 1101 to step 1109 can be referred to the description in FIG. 10 and will not be described again here.
  • Step 1110 The VMR moves, the access network equipment is replaced, and N2 handover is performed.
  • the MT function of the VMR is switched from the first access network device to the second access network device. Then, the DU function of the VMR establishes an F1 connection with the second access network device, and the second access network device activates the VMR. community. Among them, the MT function of the VMR is switched from the first access network device to the second access network device. It can be understood that the MT function of the VMR is accessed from the cell of the first access network device to the cell of the second access network device. , that is, the cell currently accessed by the VMR has changed. For example, the cell currently accessed by the VMR has changed from cell 2 of the first access network device to cell 4 of the second access network device, where the TAC corresponding to cell 2 and/or Cell ID is different from the TAC and/or Cell ID corresponding to cell 4.
  • Step 1111 During the handover process, the first access network device sends a handover request message to AMF 2, and the handover request message carries context information.
  • the first access network device sends a handover request (Handover Required) message to the AMF 2 serving the VMR.
  • the handover request message contains context information sent by the first access network device to the second access network device.
  • the context information Information can be transmitted using a source to target transparent container, and the context information also includes location reporting information, such as the AMF 1 identification.
  • Step 1112 AMF 2 sends a handover request message to the second access network device, where the handover request message carries context information.
  • Step 1113 The second access network device sends a location report (location report) message to the AMF.
  • Step 1114 AMF sends a terminal device movement notification to SMF.
  • Step 1115 SMF determines whether to perform anchor point migration.
  • step 1113 and step 1115 For detailed description of step 1113 and step 1115, reference can be made to the embodiment shown in FIG. 10 and will not be described in detail here.
  • the first access network device actively reports the current location information of the mobile relay to the core network device serving the terminal device, so as to facilitate the core network
  • the device determines the location information of the terminal device based on the current location information of the mobile relay, where the location information includes the TAC and/or Cell ID corresponding to the cell of the first access network device currently accessed by the mobile relay.
  • the first access network device actively reports the location information of the mobile relay, so that the core network device can determine the location information of the terminal device based on the location information of the mobile relay.
  • This application provides a terminal device that accesses the mobile relay.
  • the method of obtaining the location information of the terminal device solves the problem that the cell information of the mobile relay accessed by the terminal device does not match the current actual location of the terminal device.
  • the core network equipment can also accurately determine the actual location of the terminal equipment.
  • Figure 12 is a schematic block diagram of a communication device 1200 provided by an embodiment of the present application.
  • the communication device 1200 includes a processing unit 1210 and a transceiver unit 1220 .
  • the above-mentioned device 1200 can be used to implement the functions of the core network equipment in the above-mentioned method embodiment, or the above-mentioned device 1200 can include a module for realizing any function or operation of the core network equipment in the above-mentioned method embodiment.
  • the module can be all or Implemented in part through software, hardware, firmware, or any combination thereof.
  • the above device 1200 may be used to implement the functions of the access network device (such as the first access network device) in the above method embodiment, or the device 1200 may be used to realize any function of the access network device in the above method embodiment. or operating module, which may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • the processing unit 1210 is used to determine that the first cell accessed by the terminal equipment is a mobile relay cell; the transceiving unit 1820 It can be used to send a first message to the first access network device.
  • the first message carries the first information.
  • the first message is used to request the first access network device to report the location information of the mobile relay.
  • the first information is used to request the first access network device to report the location information of the mobile relay.
  • An access network device determines a mobile relay, and the mobile relay is used to provide relay services between the terminal device and the first access network device; the transceiver unit 1820 is also used to receive the mobile relay from the first access network device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay, and the second cell is the cell of the first access network device; the processing unit 1210 is also configured to based on The first location information of the mobile relay determines the location information of the terminal device.
  • the transceiver unit 1220 may be used to receive the first message from the core network device.
  • the core network device serves the terminal device
  • the first message carries the first information
  • the first message is used to request the first access network device to report the location information of the mobile relay
  • the first information is used for the first access network device
  • Determine the mobile relay the location information of the mobile relay is used by the core network device to determine the location information of the terminal device
  • the mobile relay is used to provide relay services between the terminal device and the first access network device; based on the first message, Send the first location information of the mobile relay to the core network device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay.
  • the second cell is the cell of the first access network device. .
  • the processing unit 1210 is used to determine that the first cell accessed by the terminal equipment is the cell of the mobile relay; the transceiver unit 1220 can be used to send the first cell of the mobile relay to the core network equipment serving the terminal equipment.
  • Location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay.
  • the first location information of the mobile relay is used by the core network device to determine the location information of the terminal device.
  • the mobile relay It is used to provide relay services between the terminal equipment and the first access network equipment, and the second cell is the cell of the first access network equipment.
  • the transceiver unit 1220 is used to receive the first location information of the mobile relay from the first access network device.
  • the first location information includes the TAC and/or Cell ID corresponding to the second cell currently accessed by the mobile relay.
  • the second cell is the cell of the first access network device.
  • the mobile relay is used to connect the terminal device and the first access network. Relay services are provided between devices, and the first cell accessed by the terminal device is the cell of the mobile relay; the processing unit 1210 is configured to determine the location information of the terminal device based on the first location information of the mobile relay.
  • each functional unit in various embodiments of the present application may be integrated into one processor, may exist independently, or may have two or more units integrated into one unit.
  • the above integrated units can be implemented in the form of hardware or software functional units.
  • FIG 13 is another schematic block diagram of the communication device 1300 provided by the embodiment of the present application.
  • the device 1300 may be a chip system, or may be a device configured with a chip system to implement the communication function in the above method embodiment.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the device 1300 may include a processor 1310 and a communication interface 1320.
  • the communication interface 1320 can be used to communicate with other devices through a transmission medium, so that the device 1300 can communicate with other devices.
  • the communication interface 1320 may be, for example, a transceiver, an interface, a bus, a circuit, or a device capable of implementing transceiver functions.
  • the processor 1310 can use the communication interface 1320 to input and output data, and is used to implement the method described in any of the embodiments corresponding to Figures 6 to 11.
  • the device 1300 can be used to implement the functions of the access network equipment or core network equipment in the above method embodiments.
  • the processor 1310 is used to implement the functions of the above-mentioned processing unit 1210, and the communication interface 1320 is used to implement the functions of the above-mentioned transceiver unit 1220. Function.
  • the apparatus 1300 further includes at least one memory 1330 for storing program instructions and/or data.
  • Memory 1330 and processor 1310 are coupled.
  • the coupling in the embodiment of this application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information interaction between devices, units or modules.
  • the processor 1310 may cooperate with the memory 1330.
  • Processor 1310 may execute program instructions stored in memory 1330 . At least one of the at least one memory may be included in the processor.
  • the embodiment of the present application does not limit the specific connection medium between the processor 1310, the communication interface 1320, and the memory 1330.
  • the processor 1310, the communication interface 1320, and the memory 1330 are connected through a bus 1340.
  • the bus 1340 is represented by a thick line in FIG. 13 , and the connection methods between other components are only schematically illustrated and not limited thereto.
  • the bus can be divided into address bus, data bus, control bus, etc. For ease of presentation, only one thick line is used in Figure 13, but it does not mean that there is only one bus or one type of bus.
  • FIG 14 is a schematic structural diagram of an access network device provided by an embodiment of the present application, which may be a schematic structural diagram of a base station, for example.
  • the base station 1400 can perform the functions of the access network device in the above method embodiment.
  • the base station 1400 may include one or more radio frequency units, such as a remote radio unit (RRU) 1410 and one or more baseband units (BBUs) (also called distributed units ( DU))1420.
  • RRU 1410 may be called a transceiver unit, corresponding to the transceiver unit 1220 in Figure 12.
  • the BBU 1420 is the control center of the base station and can also be called a processing unit. It can correspond to the processing unit 1210 in Figure 12 and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, etc.
  • the BBU processing unit
  • the BBU can be used to control the base station to execute the operation process related to the access network equipment in the above method embodiment.
  • the BBU 1420 may be composed of one or more single boards. Multiple single boards may jointly support a single access standard wireless access network (such as an LTE network), or may support different access standard wireless access networks respectively. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 1420 also includes a memory 1421 and a processor 1422.
  • the memory 1421 is used to store necessary instructions and data.
  • the processor 1422 is used to control the base station to perform necessary actions, for example, to control the base station to perform the operation process of the access network equipment in the above method embodiment.
  • the memory 1421 and processor 1422 may serve one or more single boards. In other words, the memory and processor can be set independently on each board. It is also possible for multiple boards to share the same memory and processor. In addition, necessary circuits can also be installed on each board.
  • the base station 1400 shown in Figure 14 can implement various processes involving access network equipment in the above method embodiments.
  • the operations and/or functions of each module in the base station 1400 are respectively intended to implement the corresponding processes in the above method embodiments.
  • the computer program product includes: a computer program (which can also be called a code, or an instruction).
  • a computer program which can also be called a code, or an instruction.
  • the computer program When the computer program is run, it causes the computer to execute the implementation corresponding to Figures 6 to 11. The method described in any of the examples.
  • This application also provides a computer-readable storage medium that stores a computer program (which may also be called a code, or an instruction).
  • a computer program which may also be called a code, or an instruction.
  • the computer program When the computer program is run, the computer is caused to execute the method described in any one of the embodiments corresponding to Figures 6 to 11.
  • the embodiment of the present application provides a communication system, which includes the access network equipment and the core network equipment as mentioned above.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities.
  • each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other processors.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • programmed logic devices discrete gate or transistor logic devices, discrete hardware components.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the steps of the method disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • non-volatile memory may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically removable memory. Erase electrically programmable read-only memory (EPROM, EEPROM) or flash memory.
  • Volatile memory can be random access memory (RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • double data rate SDRAM double data rate SDRAM
  • DDR SDRAM double data rate SDRAM
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous link dynamic random access memory
  • direct rambus RAM direct rambus RAM
  • unit may be used to refer to computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution.
  • the units and modules in the embodiments of this application have the same meaning and can be used interchangeably.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.
  • each functional unit may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions (programs). Load and execute the program on the computer Computer program instructions (programs) are used to generate, in whole or in part, the processes or functions described in the embodiments of this application.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another, e.g., the computer instructions may be transferred from a website, computer, server, or data center Transmission to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more available media integrated.
  • the available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, digital video discs, DVDs), or semiconductor media (eg, solid state disks, SSDs) )wait.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

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Abstract

提供了一种通信方法及相关装置，包括：在终端设备接入的小区是移动中继的小区的情况下，核心网设备基于移动中继的位置信息来确定终端设备的位置信息。一种设计是，服务于终端设备的核心网设备在确定终端设备接入的小区是移动中继的小区后，向移动中继当前接入的第一接入网设备请求移动中继的位置信息，并基于接收到的移动中继的位置信息确定终端设备的位置信息。另一种设计是，第一接入网设备在确定终端设备接入的小区是移动中继的小区后，主动向服务于终端设备的核心网设备上报移动中继当前的位置信息，以便于核心网设备基于移动中继的位置信息确定终端设备的位置信息。解决了移动中继的小区信息可能与终端设备的实际地理位置不匹配的问题。

Description

一种通信方法及相关装置
本申请要求于2022年04月14日提交中国国家知识产权局、申请号为202210392021.7、申请名称为“一种通信方法及相关装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种通信方法及相关装置。
背景技术
随着通信技术的发展，中继设备得以广泛应用，第五代移动通信系统(the fifth generation，5G)新无线(new radio，NR)研究中提出了集成无线接入链路和无线回传链路的接入回传一体化(integrated access and backhaul，IAB)的节点。IAB节点通过无线接口以类似终端的方式接入一个服务于它的基站，该基站称为宿主基站(donor base station)，IAB节点和宿主基站之间的无线接口链路称为回传链路(backhaul link)。IAB节点对接入其小区的终端提供与普通基站类似的功能和服务，IAB节点与终端之间的通信链路称之为接入链路(access link)。通常的IAB节点一般固定在地面上或者楼宇中，不具备移动性，终端设备接入该固定位置的IAB节点之后，网络可以根据该IAB节点的小区信息来确定终端设备的位置。然而，越来越多的移动中继普遍应用起来，例如，移动中继可以是搭载在车辆上的车载中继(vehicle mounted relay，VMR)。移动中继的应用使得位于车辆内部或者车辆周围的终端设备可以通过连接移动中继来实现入网。可以理解为VMR节点就是具有移动能力的IAB节点。
通常，移动中继的小区信息是由操作管理维护(operation administration and maintenance，OAM)设备配置的，当移动中继发生移动时，移动中继的小区信息可能一直都保持不变或者无法及时更新，导致移动中继的小区信息与当前的地理位置无法匹配，因此，当终端设备连接至移动中继之后，移动中继的小区信息可能无法准确代表终端设备的实际位置。例如，管理设备为移动中继的小区配置一个固定的跟踪区域码(tracking area code，TAC)，比如为TAC#1。移动中继位于第一位置，移动中继发出的广播消息中包括的TAC为TAC#1。当移动中继从第一位置移动至第二位置，移动中继的TAC未发生变化，该移动中继发出的广播消息中包括的TAC依然为TAC#1。由于对于接入移动中继的终端而言，该终端接入的移动中继的TAC一直为TAC#1。因此即使移动中继已经移动至第二位置，但是网络侧可能仍然认为该移动中继处于第一位置，继而确定接入该移动中继的终端也处于第一位置附近。可见，为移动中继配置一个固定的TAC会导致网络侧为接入该移动中继的终端确定出错误的位置信息。
因此，亟需提供一种方法，希望网络侧能够确定连接至移动中继的终端的准确位置信息。
发明内容
本申请提供了一种通信方法及相关装置，希望网络侧能够确定连接至移动中继的终端的准确位置信息。
第一方面，本申请提供了一种通信方法，该方法可以由核心网设备执行，或者，也可以由配置在核心网设备中的部件(如芯片、芯片系统等)执行，或者，还可以由能够实现全部或部分核心网设备功能的逻辑模块或软件实现，本申请对此不作限定。
其中，上述核心网设备是服务于终端设备的核心网设备。
示例性地，该方法包括：确定终端设备接入的第一小区是移动中继的小区；向第一接入网设备发送第一消息，第一消息中携带第一信息，第一消息用于请求第一接入网设备上报移动中继的位置信息，第一信息用于第一接入网设备确定移动中继，移动中继用于在终端设备和第一接入网设备之间提供中继服务；接收来自第一接入网设备的移动中继的第一位置信息，第一位置信息包括移动中继当前接入的第二小区对应的跟踪区域码(tracking area code，TAC)和/或小区标识(cell identifier，Cell ID)，第二小区为第一接入网设备的小区；基于移动中继的第一位置信息，确定终端设备的位置信息。
基于上述技术方案，核心网设备在确定终端设备接入的小区是移动中继的小区后，向移动中继当前接入的接入网设备请求移动中继的位置信息，并在接收到来自接入网设备的移动中继的当前的位置信息后，基于上述移动中继的位置信息确定终端设备的位置信息，其中，移动中继的位置信息包括移动中继当前接入的接入网设备的小区对应的TAC和/或Cell ID，核心网设备通过获取到的移动中继的位置信息，确定终端设备的位置信息。本申请提供了一种接入移动中继的终端设备在移动场景下，如何获取终端设备的位置信息的方法，解决了由于终端设备接入的移动中继的小区信息与终端设备当前的实际位置不匹配的问题，换言之，虽然移动中继的小区信息无法反映出终端设备的实际位置信息，核心网设备也可以准确地确定到终端设备的实际位置。
核心网设备确定终端设备接入的第一小区是移动中继的小区，一种可能的实现方式是，核心网设备从第一接入网设备接收第一小区的信息，第一小区的信息包括第一小区对应的TAC和/或Cell ID；基于预存的配置信息和第一小区的信息，确定第一小区是移动中继的小区，配置信息包括移动中继的小区信息，小区信息包括TAC和/或Cell ID，移动中继的小区信息包括第一小区的信息。
另一种可能的实现方式是，核心网设备从第一接入网设备或终端设备接收第二信息，该第二信息用于指示终端设备接入的小区是移动中继的小区。
核心网设备可以通过上述可能的实现方式中的任一种方式，确定终端设备接入的第一小区是移动中继的小区，也即，终端设备从移动中继接入。本申请通过提供多种确定终端设备接入的第一小区时移动中继的小区的实现方式，提升了灵活性。需要注意的是，本申请中，确定终端设备接入的第一小区是移动中继的小区，与，确定终端设备接入的第一小区是具有移动性的小区的含义相同。
结合第一方面，在第一方面的某些可能的实现方式中，上述方法还包括：接收来自第二接入网设备的移动中继的第二位置信息，第二位置信息包括移动中继接入的第三小区对应的TAC和/或Cell ID，第三小区为所述第二接入网设备的小区；基于接收到的第二位置信息，确定终端设备的位置发生变化。
在移动中继发生移动(终端设备跟着移动中继一起发生移动)的情况下，例如移动中继由第一接入网设备切换至接入第二接入网设备，也即，接入第二接入网设备的某一小区，则核心网设备可以接收来自第二接入网设备的移动中继的第二位置信息，以便于基于移动中继当前的第二位置信息，准确地确定出终端设备当前的位置信息。另外，核心网设备还可以基于第二位置信息和第一位置信息，确定终端设备的位置发生移动。
第二方面，本申请提供了一种通信方法，该方法可以由第一接入网设备执行，或者，也可以由配置在第一接入网设备中的部件(如芯片、芯片系统等)执行，或者，还可以由能够实现全部或部分第一接入网设备功能的逻辑模块或软件实现，本申请对此不作限定。
其中，上述第一接入网设备是移动中继当前接入的接入网设备。
示例性地，该方法包括：接收来自核心网设备的第一消息，核心网设备服务于终端设备，第一消息中携带第一信息，第一消息用于请求第一接入网设备上报移动中继的位置信息，第一信息用于第一接入网设备确定移动中继，移动中继的位置信息用于核心网设备确定终端设备的位置信息，移动中继用于在终端设备和第一接入网设备之间提供中继服务；基于第一消息，向核心网设备发送移动中继的第一位置信息，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，第二小区为第一接入网设备的小区。
基于上述技术方案，第一接入网设备在接收到来自核心网设备的第一消息后，上报移动中继的第一位置信息，也即上报移动中继当前接入的第二小区对应的TAC和/或Cell ID，以便于核心网设备基于该移动中继的位置信息确定终端设备的位置信息。通过移动中继的位置信息，确定终端设备的位置信息。本申请提供了一种接入移动中继的终端设备在移动场景下，如何获取终端设备的位置信息的方法，解决了由于终端设备接入的移动中继的小区信息与终端设备当前的实际位置不匹配的问题，换言之，虽然移动中继的小区信息无法反映出终端设备的实际位置信息，核心网设备也可以准确地确定到终端设备的实际位置。
结合第二方面，在第二方面的某些可能的实现方式中，上述方法还包括：向第二接入网设备发送移动中继的上下文信息，第二接入网设备是移动中继切换后的接入网设备，移动中继的上下文信息包括核心网设备的标识。
在移动中继发生移动，由第一接入网设备切换至接入第二接入网设备的情况下，可以认为终端设备跟着移动中继一起发生移动，第一接入网设备向第二接入网设备发送移动中继的上下文信息，以便于触发第二接入网设备上报移动中继当前的位置信息，也即移动后的位置信息，从而核心网设备可以获取到移动中继当前的位置信息。
结合第一方面和第二方面，在某些可能的实现方式中，上述第一信息包括以下一种或者多种：移动中继的标识；第一小区对应的TAC，第一小区是终端设备接入的移动中继的小区；和第一小区的Cell ID。
核心网设备发送的第一消息中携带第一信息，第一信息可以用于确定移动中继，也即第一接入网设备可以基于该第一信息确定上报哪个移动中继的位置信息。第一信息可以包括移动中继的标识、第一小区对应的TAC或第一小区Cell ID中的一种或多种，第一接入网设备基于上述任一信息都可以确定出需要上报哪个移动中继的位置信息。
结合第一方面和第二方面，在某些可能的实现方式中，上述第一消息中还携带如下一项或多项：移动中继的位置信息的上报周期、移动中继的位置信息类型、以及核心网设备的标识，移动中继的位置信息类型包括移动中继所接入的小区的TAC和/或Cell ID。
核心网设备可以给第一接入网设备指示移动中继的位置信息的上报周期，也即，多久上报一次移动中继的位置信息。核心网设备还可以给第一接入网设备指示移动中继的位置信息类型，也即，第一接入网设备是上报移动中继所接入的小区的TAC，还是Cell ID，还是二者都上报。核心网设备还可以给第一接入网设备指示核心网设备的标识，该核心网设备是服务于终端设备的核心网设备，也即需要给第一接入网设备指示将移动中继的位置信息上报给哪个核心网设备。
第三方面，本申请提供了一种通信方法，该方法可以由第一接入网设备执行，或者，也可以由配置在第一接入网设备中的部件(如芯片、芯片系统等)执行，或者，还可以由能够实现全部或部分第一接入网设备功能的逻辑模块或软件实现，本申请对此不作限定。
其中，上述第一接入网设备是移动中继当前接入的接入网设备。
示例性地，该方法包括：确定终端设备接入的第一小区是移动中继的小区；向服务于终端设备的核心网设备发送移动中继的第一位置信息，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，移动中继的第一位置信息用于核心网设备确定终端设备的位置信息，移动中继用于在终端设备和第一接入网设备之间提供中继服务，第二小区为第一接入网设备的小区。
基于上述技术方案，第一接入网设备在确定终端设备接入的小区是移动中继的小区后，主动向服务于终端设备的核心网设备上报移动中继当前的位置信息，以便于核心网设备基于移动中继的当前的位置信息确定终端设备的位置信息，其中，位置信息包括移动中继当前接入的第一接入网设备的小区对应的TAC和/或Cell ID。本申请提供了一种接入移动中继的终端设备在移动场景下，如何获取终端设备的位置信息的方法，解决了由于终端设备接入的移动中继的小区信息与终端设备当前的实际位置不匹配的问题，换言之，虽然移动中继的小区信息无法反映出终端设备的实际位置信息，核心网设备也可以准确地确定到终端设备的实际位置。
第一接入网设备在确定终端设备接入的小区是移动中继的小区，一种可能的实现方式是，第一接入网设备基于预存的配置信息和第一小区的信息，确定第一小区是移动中继的小区，第一小区的信息包括第一小区对应的TAC和/或Cell ID，配置信息包括移动中继的小区信息，小区信息包括TAC和/或Cell ID，移动中继的小区信息包括第一小区的信息。
另一种可能的实现方式是，第一接入网设备从移动中继或者终端设备接收第一指示信息，第一指示信息用于指示第一小区为具有移动性的小区，和/或，移动中继具有移动性。
第一接入网设备可以通过上述可能的实现方式中的任一种方式，确定终端设备接入的第一小区是移动中继的小区，也即，终端设备从移动中继接入。本申请通过提供多种确定终端设备接入的第一小区时移动中继的小区的实现方式，提升了灵活性。
结合第三方面，在第三方面的某些可能的实现方式中，上述方法还包括：确定移动中继的位置信息的上报周期和/或上报条件，其中，上报条件包括移动中继接入的小区由第二小区切换至第三小区，第二小区和第三小区是第一接入网设备的小区，第二小区与第三小区的TAC和/或Cell ID不同。
第一接入网设备可以确定出移动中继的位置信息的上报周期，即多久上报一次。另外，第一接入网设备还可以设置上报条件，如移动中继接入的小区的TAC和/或Cell ID发生变化，当满足上述条件时，可以触发第一接入网设备主动上报移动中继当前的位置信息。
可选地，在移动中继接入的小区由第二小区切换至第三小区的情况下，上述方法还包括：向核心网设备发送第三小区对应的TAC和/或Cell ID。
结合第三方面，在第三方面的某些可能的实现方式中，向服务于终端设备的核心网设备发送移动中继的第一位置信息，包括：向核心网设备发送N2消息，N2消息中包括第一位置信息。
第一接入网设备可以将移动中继的第一位置信息携带在N2消息中，发送给核心网设备，以便于核心网设备获取到移动中继的位置信息。
结合第三方面，在第三方面的某些可能的实现方式中，上述方法还包括：向第二接入网设备发送移动中继的上下文信息，第二接入网设备是移动中继切换后的接入网设备，移动中继的上下文信息包括核心网设备的标识。
在移动中继发生移动，由第一接入网设备切换至接入第二接入网设备的情况下，可以认为终端设备跟着移动中继一起发生移动，第一接入网设备向第二接入网设备发送移动中继的上下文信息，以便于触发第二接入网设备上报移动中继当前的位置信息，也即移动后的位置信息，从而核心网设备可以获取到移动中继当前的位置信息。
第四方面，本申请提供了一种通信方法，该方法可以由核心网设备执行，或者，也可以由配置在核心网设备中的部件(如芯片、芯片系统等)执行，或者，还可以由能够实现全部或部分核心网设备功能的逻辑模块或软件实现，本申请对此不作限定。
其中，上述核心网设备是服务于终端设备的核心网设备。
示例性地，该方法包括：接收来自第一接入网设备的移动中继的第一位置信息，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，第二小区为第一接入网设备的小区，移动中继用于在终端设备和第一接入网设备之间提供中继服务，终端设备接入的第一小区为移动中继的小区。基于移动中继的第一位置信息，确定终端设备的位置信息。
基于上述技术方案，核心网设备获取到第一接入网设备上报的移动中继的第一位置信息后，基于移动中继的第一位置信息确定终端设备的位置信息，其中，位置信息包括移动中继当前接入的第一接入网设备的小区对应的TAC和/或Cell ID。本申请提供了一种接入移动中继的终端设备在移动场景下，如何获取终端设备的位置信息的方法，解决了由于终端设备接入的移动中继的小区信息与终端设备当前的实际位置不匹配的问题，换言之，虽然移动中继的小区信息无法反映出终端设备的实际位置信息，核心网设备也可以准确地确定到终端设备的实际位置。
结合第四方面，在第四方面的某些可能的实现方式中，上述方法还包括：从第一接入网设备接收N2消息，N2消息包含移动中继的第一位置信息。
结合第四方面，在第四方面的某些可能的实现方式中，上述方法还包括：接收来自第一接入网设备的移动中继的第二位置信息，第二位置信息包括移动中继当前接入的第三小区对应的TAC和/或Cell ID，第三小区和第二小区是第一接入网设备的小区，第三小区与第二小区的TAC和/或Cell ID不同。
结合第四方面，在第四方面的某些可能的实现方式中，上述方法还包括：接收来自第二接入网设备的移动中继的第三位置信息，第三位置信息包括移动中继当前接入的第四小区对应的TAC和/或Cell ID，第四小区是第二接入网设备的小区。
在移动中继发生移动(终端设备跟着移动中继一起发生移动)的情况下，例如移动中继由第一接入网设备切换至接入第二接入网设备，也即，接入第二接入网设备的某一小区，则核心网设备可以接收来自第二接入网设备的移动中继当前的位置信息，以便于基于移动中继当前的位置信息，准确地确定出终端设备当前的位置信息。
结合第三方面和第四方面，在某些可能的实现方式中，上述N2消息中还包括以下一种或者多种：第一小区对应的TAC；第一小区的Cell ID；和终端设备的非接入层(non access stratum，NAS)消息。
第五方面，本申请提供了一种通信装置，可以实现第一方面和第一方面任一种可能的实现方式中所述的方法，或实现第二方面和第二方面任一种可能的实现方式中所述的方法，或实现第三方面和第三方面任一种可能的实现方式中所述的方法，或实现第四方面和第四方面任一种可能的实现方式中所述的方法。该装置包括用于执行上述方法的相应的单元。该装置包括的单元可以通过软件和/或硬件方式实现。
第六方面，本申请提供了一种通信装置，该装置包括处理器。该处理器与存储器耦合，可用于执行存储器中的计算机程序，以实现第一方面和第一方面任一种可能的实现方式中所述的方法，或实现第二方面和第二方面任一种可能的实现方式中所述的方法，或实现第三方面和第三方面任一种可能的实现方式中所述的方法，或实现第四方面和第四方面任一种可能的实现方式中所述的方法。
第七方面，本申请提供了一种计算机可读存储介质，该计算机可读存储介质中存储有计算机程序或指令，当该计算机程序或指令被执行时，以实现第一方面和第一方面任一种可能的实现方式中所述的方法，或实现第二方面和第二方面任一种可能的实现方式中所述的方法，或实现第三方面和第三方面任一种可能的实现方式中所述的方法，或实现第四方面和第四方面任一种可能的实现方式中所述的方法。
第八方面，本申请提供了一种计算机程序产品，该计算机程序产品包括指令，当该指令被运行时，以实现第一方面和第一方面任一种可能的实现方式中所述的方法，或实现第二方面和第二方面任一种可能的实现方式中所述的方法，或实现第三方面和第三方面任一种可能的实现方式中所述的方法，或实现第四方面和第四方面任一种可能的实现方式中所述的方法。
第九方面，本申请提供了一种芯片系统，该芯片系统包括处理器，还可以包括存储器，用于实现第一方面和第一方面任一种可能的实现方式中所述的方法，或实现第二方面和第二方面任一种可能的实现方式中所述的方法，或实现第三方面和第三方面任一种可能的实现方式中所述的方法，或实现第四方面和第四方面任一种可能的实现方式中所述的方法。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
应当理解的是，本申请的第五方面至第九方面与本申请的第一方面至第四方面的技术方案相对应，各方面及对应的可行实施方式所取得的有益效果相似，不再赘述。
附图说明
图1是本申请实施例提供的IAB网络架构的示意图；
图2是本申请实施例提供的基于IAB技术的通信流程示意图；
图3是本申请实施例提供的基于服务化架构的网络架构示意图；
图4是本申请实施例提供的基于点对点接口的网络架构示意图；
图5是适用于本申请实施例提供的方法的系统架构示意图；
图6是本申请实施例提供的第一种通信方法的示意性流程图；
图7是本申请实施例提供的图6所示的通信方法的详细流程示意图；
图8是本申请实施例提供的图6所示的通信方法的又一详细流程示意图；
图9是本申请实施例提供的第二种通信方法的示意性流程图；
图10是本申请实施例提供的图9所示的通信方法的详细流程示意图；
图11是本申请实施例提供的图9所示的通信方法的又一详细流程示意图；
图12是本申请实施例提供的通信装置的示意性框图；
图13是本申请实施例提供的通信装置的又一示意性框图；
图14是本申请实施例提供的接入网设备的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请提供的技术方案可以应用于各种通信系统，例如：5G移动通信系统或NR。其中，5G移动通信系统可以包括非独立组网(non-standalone，NSA)和/或独立组网(standalone，SA)。
本申请提供的技术方案还可以应用于机器类通信(machine type communication，MTC)、机器间通信长期演进技术(long term evolution-machine，LTE-M)、设备到设备(device to device，D2D)网络、机器到机器(machine to machine，M2M)网络、物联网(internet of things，IoT)网络或者其他网络。其中，IoT网络例如可以包括车联网。其中，车联网系统中的通信方式统称为车到其他设备(vehicle to X，V2X，X可以代表任何事物)，例如，该V2X可以包括：车辆到车辆(vehicle to vehicle，V2V)通信，车辆与基础设施(vehicle to infrastructure，V2I)通信、车辆与行人之间的通信(vehicle to pedestrian，V2P)或车辆与网络(vehicle to network，V2N)通信等。
本申请提供的技术方案还可以应用于未来的通信系统，如第六代移动通信系统等。本申请对此不作限定。
在具体介绍本申请实施例提供的通信方法之前，先对本申请涉及到的各网元做简单介绍：
1、终端设备：可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。
终端设备可以是一种向用户提供语音/数据连通性的设备，例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端的举例可以为：手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑(如笔记本电脑、掌上电脑等)、移动互联网设备(mobile internet device，MID)、虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智 慧家庭(smart home)中的无线终端、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等。
此外，终端设备还可以是IoT系统中的终端设备。IoT是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。IoT技术可以通过例如窄带(narrow band，NB)技术，做到海量连接，深度覆盖，终端省电。
此外，终端设备还可以包括智能打印机、火车探测器、加油站等传感器，主要功能包括收集数据(部分终端设备)、接收网络设备的控制信息与下行数据，并发送电磁波，向网络设备传输上行数据。
2、接入网(access network，AN)设备：接入网可以为特定区域的授权用户提供入网功能，并能够根据用户的级别、业务的需求等使用不同质量的传输隧道。接入网络可以为采用不同接入技术的接入网络。目前的无线接入技术有两种类型：第三代合作伙伴计划(3rd generation partnership project，3GPP)接入技术(例如3G、4G或5G系统中采用的无线接入技术)和非3GPP(non-3GPP)接入技术。3GPP接入技术是指符合3GPP标准规范的接入技术，例如，5G系统中的接入网设备称为下一代基站节点(next generation node base station，gNB)。非3GPP接入技术是指不符合3GPP标准规范的接入技术，例如，以无线保真(wireless fidelity，Wi-Fi)中的接入点(access point，AP)为代表的空口技术。
基于无线通信技术实现接入网络功能的接入网可以称为无线接入网(radio access network，RAN)。无线接入网能够管理无线资源，为终端设备提供接入服务，进而完成控制信号和用户数据在终端和核心网之间的转发。
无线接入网设备例如可以包括但不限于：无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved node B，或home node B，HNB)、基带单元(baseband unit，BBU)，Wi-Fi系统中的AP、无线中继节点、无线回传节点、传输点(transmission point，TP)或者发送接收点(transmission and reception point，TRP)等，还可以为5G(如，NR)系统中的gNB或传输点(TRP或TP)，5G系统中的基站的一个或一组(包括多个天线面板)天线面板，或者，还可以为构成gNB或传输点的网络节点，如基带单元(BBU)，或，分布式单元(distributed unit，DU)，或者下一代通信6G系统中的基站等。本申请对无线接入网设备所采用的具体技术和具体设备形态不做限定。无线接入网设备可以包括gNB-集中单元(centralized unit，CU)和gNB-DU。gNB-CU和gNB-DU通过F1接口相连。CU和核心网之间通过下一代(next generation，NG)接口相连。gNB-DU包括物理层(phyical layer，PHY)/媒体接入控制(medium access control，MAC)/无线链路控制(radio link control，RLC)层的功能，用于为该接入网设备下附着的中继设备提供接入服务。gNB-DU可以通过F1接口与gNB-CU连接。该gNB-DU也可以通过Uu接口与终端设备或移动中继的移动终端(mobile-termination，MT)功能连接。
gNB-CU用于对其下所有的中继设备和终端设备进行无线资源控制(radio resource control，RRC)控制，例如可以存储中继设备和终端设备的上下文等。gNB-CU可以通过F1接口与其它中继设备的DU功能连接。
3、IAB节点(node)：在5G NR研究中提出了IAB节点，该IAB节点集成无线接入链路和无线回传链路，其中无线接入链路为终端设备与IAB节点之间的通信链路，无线回传链路为IAB节点之间的通信链路，主要进行数据回传。IAB节点启动后，其MT功能(functionality)将通过小区选择接入网络，IAB节点不需要有线传输网络进行数据回传。因此，IAB节点降低了对有线传输网络的部署要求，可以部署在室外、室内等不易部署有线传输网络的场景下。为更加清楚地理解IAB节点，下面对IAB网路架构和基于IAB技术进行通信的流程进行详细描述。
图1是本申请实施例提供的IAB网络架构的示意图。如图1所示，包括5G核心网(5G core，5GC)和NG RAN。NG-RAN通过IAB节点无线连接于能够服务于IAB节点的gNB来支持IAB，命名为IAB-宿主(donor)。IAB-宿主由一个IAB-宿主-集中式单元(centralized unit，CU)和一个或多个IAB-宿主-DU组成。IAB节点经由NR Uu口的移动终端功能(命名为IAB节点的IAB-MT功能)连接到上游IAB节点或IAB-宿主-DU。IAB节点通过NR Uu口的网络功能(命名为IAB节点的IAB-DU功能)向下游IAB节点和终端设备提供无线回传。图中NG、NR Uu和F1均属于逻辑接口，各接口的功能此处不再一一详述。IAB节点可以包括MT和DU两部分，MT类似于UE的功能，通过Uu接口与父节点进行通信，提供数据回传。IAB节点的DU类似于gNB中DU的功能，包含PHY/MAC/RLC层的功能，与子节点进行通信，为子节点提供接入服务。
图2是本申请实施例提供的基于IAB技术的通信流程示意图。
步骤201，IAB节点注册入网。
IAB节点可通过接入网设备发起注册流程实现入网。例如，IAB节点的MT功能通过小区选择来接入网络。具体地，步骤201包括步骤2011和步骤2012。
步骤2011，IAB节点的MT功能向接入网设备发送注册请求消息。相应地，接入网设备接收注册请求消息。
IAB节点的MT功能向接入网设备发送注册请求消息，接入网设备接收注册请求消息后，可以为IAB节点的MT功能选择核心网设备。
步骤2012，接入网设备将注册请求消息发送至所选择的核心网设备。例如，可以通过N2消息将注册请求消息发送至核心网设备，其中，上述注册请求消息中可以指示请求注册入网的是IAB节点。该过程中，IAB节点的初始接入过程与常规终端设备相同。
步骤202，IAB节点的MT功能发起会话建立。
IAB节点的MT功能发起会话建立，进而核心网设备给IAB节点的MT功能分配互联网协议(internet protocol，IP)地址，IAB节点的MT功能使用该IP地址跟OAM进行交互。
步骤203，OAM给IAB节点配置小区信息，如小区标识、TAC等信息。需要说明的是，在本申请实施例中，OAM给IAB节点配置小区信息是固定不变的，换言之，IAB节点不管移动到哪里，其小区信息不会发生变化，也即IAB节点的小区信息与IAB节点的地理位置无关。
步骤204，IAB节点的DU功能向宿主-CU发送F1配置请求(setup request)消息。
IAB节点的DU功能选择合适的宿主无线接入网(donor RAN)设备后，向宿主-CU发送F1配置请求消息，该F1配置请求消息中携带该宿主-CU支持的小区信息，如小区标识、TAC等信息。宿主-CU接收到该F1配置请求消息后，激活IAB节点的小区。
其中，步骤204中的donor RAN跟步骤201中的接入网设备可以相同或者不同，不做限制。
步骤205，宿主-CU可以向核心网设备发送配置更新消息。具体地，宿主-CU可以通过配置更新流程向核心网设备发送配置更新消息。
步骤206，宿主-CU向IAB节点的DU功能发送F1配置响应(setup response)消息。该F1配置响应消息中携带激活后的小区信息(cells to be activated list)，其中，激活后的小区信息包括激活后的小区的小区标识。
应理解，本申请实施例中，IAB节点注册入网的含义，跟IAB节点的MT功能注册入网的含义相同。换言之，在未作出特别说明的情况下，IAB节点的MT功能执行动作的描述也可以替换为IAB节点的执行动作。
还应理解，关于注册入网流程的具体内容可参照现有终端设备的入网流程，为了简洁，此处不做赘述。
4、移动中继：指的是集成了无线接入链路和无线回传链路且具有移动性的无线接入网设备，其中无线接入链路为终端设备与移动中继之间的通信链路，无线回传链路为移动中继和部署在地面上没有移动性的无线接入网设备之间的通信链路，无线回传链路主要进行数据回传。移动中继支持Uu、F1、E1、NG以及X2等接口，且包含了无线接入网设备的功能和MT功能。其中，MT功能集成于移动中继之中，该功能实体用于移动中继与宿主无线接入网(donor RAN)设备或者其他移动中继之间的回传链路的Uu口终结点。当移动中继启动后MT功能会进行小区选择，从而接入到网络。
可以理解的是，与IAB节点不同的是，移动中继具有移动性。例如，通过在车辆上搭载集成了无线接入链路和无线回传链路的中继，使其可随着车辆的移动而移动，就是一种典型的移动中继，也就是车载中继(vehicle mounted relay，VMR)。
5、宿主无线接入网(donor RAN)设备：通常指的是部署在地面上没有移动性的无线接入网设备，通过donor RAN与移动中继之间的回传链路和移动中继提供的接入链路向终端设备提供网络接入。宿主无线接入网设备可以由CU和一个或多个DU组成。其中，CU主要处理非实时的无线高层协议栈功能，例如RRC层协议和分组数据汇聚层(packet data convergence protocol，PDCP)层协议，DU主要处理PHY功能和实时性需求较高的层2功能，例如PHY协议。CU和DU可通过F1接口相互通信。
本申请对于donor RAN可以连接的移动中继的数量不作限定。
为了描述方便，本申请将宿主无线接入网设备简称为接入网设备。除非特殊声明，本申请实施例中的接入网设备均指的是宿主无线接入网(donor RAN)设备。
下面对核心网部分的网元进行介绍。
6、接入和移动性管理功能(access and mobility management function，AMF)网元：AMF网元属于核心网络部分，主要用于移动网络中的终端的注册、移动性管理、跟踪区更新流程，接入和移动性管理网元终结了NAS消息、负责注册管理、连接管理以及可达性 管理、分配跟踪区列表(track area list，TA list)以及移动性管理等，并且负责转发会话管理(session management，SM)消息到会话管理网元。
7、会话管理功能(session management function，SMF)网元：主要用于用户面功能(user plane function，UPF)网元选择，UPF网元重选，IP地址分配，会话的建立、修改和释放，服务质量(quality of service，QoS)控制；
8、统一数据管理(Unified Data Management，UDM)网元：主要用于管理签约数据，当签约数据修改的时候，负责通知相应的网元。
9、统一数据库(Unified Data Repository，UDR)网元：主要用于存储和检索签约数据、策略数据和公共架构数据等；供UDM、策略控制功能(policy control function，PCF)网元和网络开放功能(network exposure function，NEF)网元获取相关数据。UDR可以针对不同类型的数据如签约数据、策略数据有不同的数据接入鉴权机制，以保证数据接入的安全性；UDR对于非法的服务化操作或者数据接入请求，可以返回携带合适原因值的失败响应。
10、应用功能(application function，AF)网元：可以向终端设备提供某种应用层服务，AF在向终端设备提供服务时，对QoS和计费策略(charging)有要求，且需要通知网络。同时，AF也需要核心网反馈应用相关的信息。
11、UPF网元：主要用于实现以下全部或者部分功能：将协议数据单元(protocol data unit，PDU)会话与数据网络互连；分组路由和转发(例如，支持对流量进行上行分类(uplink classifier)后转发到数据网络，支持分支节点(branching point)以支持多宿主(multi-homed)PDU会话)；数据包检测等。
为便于理解本申请实施例，下面将结合图3和图4对适用于本申请实施例的5G网络架构进行详细介绍。
图3是本申请实施例提供的基于服务化架构的网络架构示意图。如图3所示，5G网络架构中可包括三部分，分别是终端设备部分、数据网络(data network，DN)和运营商网络部分。
其中，运营商网络可包括以下网元中的一个或多个：鉴权服务器功能(Authentication Server Function，AUSF)网元、NEF网元、PCF网元、UDM网元、UDR、网络存储功能(network repository function，NRF)网元、AF网元、AMF网元、SMF网元、RAN网元、UPF网元、网络切片选择功能(network slice selection function，NSSF)网元、网络切片选择的认证和授权功能(network slice specific authentication and authorization function，NSSAAF)网元以及服务通信代理(service communication proxy，SCP)网元等。上述运营商网络中，除无线接入网部分之外的部分可以称为核心网络部分。图3所示的网络中，各部分网元可以基于服务化的接口进行通信，其中，图中的Nxxx就是基于业务的服务化的接口。应理解，部分网元的功能可以参考上文网元介绍中的描述，具体的可以参考已知的技术，此处不再赘述。
图4是本申请实施例提供的基于点对点接口的网络架构示意图。图4所示的网络中包括的网元及其相关介绍可以参考图3的描述。图4所示的网络架构与图3不同的是，图4所示的网络架构中，各个网元之间的接口是点对点的接口，而不是服务化的接口。
为便于理解本申请实施例提供的通信方法，下面将对本申请实施例提供的通信方法的 系统架构进行说明。可理解的，本申请实施例描述的系统架构是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定。
图5是适用于本申请实施例提供的方法的系统架构示意图。如图5所示，该系统500可以包括核心网510、接入网设备520、移动中继530和终端设备540。
该系统500例如可以是5G系统(5G system，5GS)。在5GS中，核心网510可以是5G核心网(5G core，5GC)。示例性地，该核心网510可以包括但不限于，AMF、SMF、UPF等，各网元可用于实现各自的功能，具体的可以参看上文的描述。本申请对于核心网510中所包括的具体网元及其功能、数量和形态均不作限定。接入网设备520可连接于核心网510，可用于为覆盖范围内的授权终端提供入网功能，管理无线资源，并完成控制信号和用户数据在终端设备与核心网510之间的转发。
在本申请实施例中，该接入网设备520不仅可以为终端设备提供无线接入服务，还可以为移动中继(如图5所示的移动中继530)提供无线回传功能，以使得移动中继可以通过接入网设备520接入核心网510。移动中继530具有移动性，例如，可以部署在车辆，一方面通过无线回传链路连接于接入网设备520，再通过接入网设备520连接至核心网510，另一方面为其附近的终端设备(包括车辆内或者车辆外与其距离较近的终端设备)提供无线接入链路，从而使得终端设备可以入网。例如，图5所示的终端设备540位于车辆外(与车辆距离较近)，可以通过移动中继530提供的无线接入链路接入移动中继530，再通过接入网设备520和接入移动中继530之间的无线回传链路接入到核心网510。
应理解，图5中仅为示例，示出了一个核心网、一个无线接入网设备、一个移动中继和一个终端设备，但这不应对本申请构成任何限定。各设备的数量均可以为一个或多个。接入同一核心网的接入网设备可以为一个或多个。接入同一无线接入网设备的移动中继的数量也可以为一个或多个。接入同一移动中继的终端设备的数量也可以为一个或多个。
此外，图5中虽未示出，终端设备540也可以位于车辆内部。
可以理解，当前5G系统中涉及很多需要获取终端设备的位置信息的场景，例如，在能力开放中涉及终端设备的位置信息相关的上报，如位置上报(location report)流程，对应的位置信息的粒度可以是跟踪区标识(tracking area identity，TAI)或Cell ID。又例如，在本地数据网络(local area data network，LADN)场景下，SMF向AMF订阅终端设备移动事件通知(mobility event notification)，对应的位置信息的粒度可以是TAI，AMF根据TAI以及LADN对应的TAI列表(list)判断终端设备当前的位置是否在LADN的服务区域里面。再例如，会话建立过程中，SMF根据终端设备的位置选择会话锚点，对应的位置信息的粒度可以是TAI。
然而，移动中继的小区信息是由OAM配置的，当移动中继发生移动时，移动中继的小区信息可能一直都保持不变或者无法及时更新，导致移动中继的小区信息与当前的地理位置无法匹配，因此，当终端设备连接至移动中继之后，移动中继的小区信息已经无法准确代表终端设备的实际位置。
为解决上述问题，本申请提供了一种通信方法，在终端设备接入的小区是移动中继的小区的情况下，可以基于上述移动中继的位置信息来确定终端设备的位置信息，解决移动中继的小区信息可能与终端设备的实际地理位置不匹配的问题，使得核心网设备可以准确地确定出终端设备的位置。
第一种可能的设计是，核心网设备在确定终端设备接入的小区是移动中继的小区后，向移动中继当前接入的第一接入网设备请求移动中继的位置信息，并在接收到来自第一接入网设备的移动中继的当前的位置信息后，基于上述移动中继的位置信息确定终端设备的位置信息，其中，移动中继的位置信息包括移动中继当前接入的第一接入网设备的小区对应的TAC和/或Cell ID。
第二种可能的设计是，第一接入网设备在确定终端设备接入的小区是移动中继的小区后，主动向服务于终端设备的核心网设备上报移动中继当前的位置信息，以便于核心网设备基于移动中继的当前的位置信息确定终端设备的位置信息，其中，位置信息包括移动中继当前接入的第一接入网设备的小区对应的TAC和/或Cell ID。
下面将结合具体的实施例分别详细描述上面两种可能的设计。
为了更好地理解本申请实施例，首先做出如下几点说明：
第一，在本申请实施例中，“当……时”、“在……的情况下”、“若”以及“如果”等描述均指在某种客观情况下设备(如，核心网设备或者接入网设备)会做出相应的处理，并非是限定时间，且也不要求设备(如，核心网设备或者接入网设备)在实现时一定要有判断的动作，也不意味着存在其它限定。
第二，在下文示出的实施例中“第一”、“第二”以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。例如，区分不同的接入网设备等。本领域技术人员可以理解，“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
第三，本申请实施例中，“至少一个”是指一个或者多个，“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的情况，其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系，但并不排除表示前后关联对象是一种“和”的关系的情况，具体表示的含义可以结合上下文进行理解。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c；a和b；a和c；b和c；或a和b和c。其中a，b，c可以是单个，也可以是多个。
第四，为了方便理解和说明，下文所述的实施例中核心网设备执行的动作具体可以由AMF执行，该AMF指的是服务于移动中继的MT功能的AMF，即，移动中继的MT入网时注册的AMF。也可以简单地描述为，上述移动中继入网时注册的AMF。另外，下文所述的实施例中的移动中继例如可以是VMR。在无特殊说明的情况下，下文所述的实施例中的接入网设备是宿主无线接入网(donor RAN)设备。
第五，在本申请实施例中，涉及网元A向网元B发送消息或数据包，以及网元B接收来自网元A的消息或数据包的相关描述，旨在说明该消息或数据包是要发给哪个网元，而并不限定它们之间是直接发送还是经由其他网元间接发送。
比如，文中所述的第二接入网设备接收来自第一接入网设备的移动中继的上下文信息，并不限定第一接入网设备是直接向第二接入网设备发送移动中继的上下文信息。在N2切换场景下，由于第一接入网设备与第二接入网设备之间不支持Xn接口的通信，故，第一接入网设备与第二接入网设备之间的通信可以通过AMF来转发。而在Xn切换场景下，由 于第一接入网设备与第二接入网设备之间支持Xn接口的通信，故第一接入网设备与第二接入网设备之间可以直接交互，而无需AMF的转发。文中虽未一一罗列，但本领域的技术人员可以理解其含义。
下面将结合附图，详细说明本申请实施例提供的通信方法。应理解，下文所示的实施例从核心网设备和接入网设备交互的角度来描述了该方法。其中，接入网设备可以是图5中所示的接入网设备520，核心网设备可以是图5中所示的核心网设备510。
还应理解，下文示出的实施例虽然以核心网设备和接入网设备交互为例来描述，但不应对该方法的执行主体构成任何限定。只要能够通过运行记录有本申请实施例提供的方法的代码的程序，便可执行本申请实施例提供的方法。例如，核心网设备也可以替换为配置在核心网设备中的部件(如，芯片、芯片系统等)，或其他能够调用程序并执行程序的功能模块，接入网设备也可以替换为配置在接入网设备中的部件(如，芯片、芯片系统等)，或其他能够调用程序并执行程序的功能模块。本申请实施例对此不作限定。
下面首先对上文中第一种可能的设计进行详细描述，也即，核心网设备在确定终端设备接入的小区是移动中继的小区后，向中继设备当前接入的第一接入网设备请求移动中继的位置信息，并在接收到来自第一接入网设备的移动中继的当前的位置信息后，基于上述移动中继的位置信息确定终端设备的位置信息，
需要说明的是，上述核心网设备是服务于终端设备的核心网设备，移动中继用于在终端设备和第一接入网设备之间提供中继服务。第一接入网设备是当前为移动中继提供服务的接入网设备，可以理解为移动中继当前接入的接入网设备，移动中继在移动的过程中会切换接入网设备，换言之，还会有第二接入网设备、第三接入网设备等为移动中继提供服务。
图6是本申请实施例提供的通信方法600的示意性流程图。图6所示的方法600可以包括步骤601至步骤604。下面详细说明方法600中的各个步骤。
步骤601，核心网设备确定终端设备接入的第一小区是移动中继的小区。
其中，第一小区是终端设备当前接入的移动中继的小区。终端设备接入的第一小区是移动中继的小区，可以理解为，终端设备接入移动中继，也即终端设备可以基于移动中继接入网络。
前已述及，终端设备接入的第一小区是移动中继的小区，当移动中继发生移动时，移动中继的第一小区的小区信息可能一直都保持不变或者无法及时更新，因此，当终端设备连接至移动中继之后，第一小区的小区信息已经无法准确代表终端设备的实际位置。这种情况下，可以通过本申请提供的方法，以确定终端设备的位置信息。
核心网设备确定终端设备接入的第一小区是移动中继的小区，可以通过如下任一种可能方式确定：
方式一，核心网设备从第一接入网设备接收第一小区的信息，该第一小区的信息包括第一小区对应的TAC和/或Cell ID，并基于预存的配置信息和第一小区的信息，确定第一小区是移动中继的小区，其中，配置信息包括移动中继的小区信息，该小区信息包括TAC和/或Cell ID，移动中继的小区信息包括第一小区的信息。也就是说，核心网设备预存有移动中继的小区信息，包括TAC和/或Cell ID，核心网设备将第一小区的信息和预存的移动中继的小区信息对比，若第一小区的信息包含在移动中继的小区信息中，则确定第一小 区是移动中继的小区。
应理解，核心网设备从第一接入网设备接收到的第一小区的信息可能包括第一小区对应的TAI，可以基于上述TAI获取到TAC，再将第一小区对应的TAC与预存的TAC对比。
还应理解，核心网设备中可以预存有移动中继的小区对应的TAC，或Cell ID，或TAC和Cell ID，本申请实施例对此不作限定。
方式二，核心网设备从第一接入网设备或者终端设备接收第二信息，该第二信息用于指示终端设备接入的小区是移动中继的小区。也就是说，第一接入网设备可以向核心网设备指示终端设备接入的小区是移动中继的小区。或者，终端设备向核心网设备指示终端设备接入的小区是移动中继的小区。
例如，第一接入网设备预配中继设备是否是移动中继的配置信息，当第一接入网设备通过移动中继接收终端设备的请求消息之后，第一接入网设备可以向核心网设备指示终端设备接入的小区是移动中继的小区。具体地，第一接入网设备向核心网设备发送N2消息，N2消息中携带指示终端设备接入的小区是移动中继的小区的指示信息。可选地，该N2消息中还可以包含移动中继的标识，该移动中继的标识用于标识终端设备当前接入的移动中继。
例如，终端设备接收第一小区的广播消息，该广播消息中携带用于指示该小区是移动中继的小区的指示信息，可选地，该广播消息中还可以携带移动中继的标识。终端设备可以向核心网设备指示终端设备接入的小区是移动中继的小区。具体地，终端设备向核心网设备发送注册请求消息，注册请求消息中携带指示终端设备接入的小区是移动中继的小区的指示信息。可选地，该注册请求消息中还可以包含移动中继的标识，该移动中继的标识用于标识终端设备当前接入的移动中继。
步骤602，核心网设备向第一接入网设备发送第一消息，该第一消息用于请求第一接入网设备上报移动中继的位置信息。
其中，第一消息中携带第一信息，第一信息用于第一接入网设备确定移动中继，也即，第一信息用于指示第一接入网设备上报哪个移动中继的位置信息。
可选地，第一信息包括以下一种或者多种：移动中继的标识；第一小区对应的TAC；或第一小区的Cell ID。
核心网设备可以在第一消息中携带上述任一种信息，以使得第一接入网设备确定上报哪个移动中继的位置信息。需要注意的是，本申请并不限定第一信息的内容，第一信息还可以是终端设备的标识，应理解，只要第一接入网设备收到第一信息可以确定移动中继，均在本申请范围内。
示例性地，核心网设备向第一接入网设备发送第一消息，该第一消息中携带移动中继的标识，以指示第一接入网设备上报该移动中继当前的位置信息。
其中，核心网设备可以通过如下任意一种方式确定移动中继的标识：
方式一：如果第一接入网设备向核心网设备发送的N2消息中包含了移动中继的标识，则核心网设备可以从N2消息中获取到移动中继的标识。
方式二：核心网设备基于预存的移动中继的小区配置信息(如表1所示)以及终端设备接入的第一小区对应的TAC和/或Cell ID，确定终端设备接入的第一小区对应的移动中继的标识。例如，核心网设备基于表1所示的对应关系和终端设备接入的第一小区对应的 TAC和/或Cell ID，确定出第一小区对应的TAC和/或Cell ID在表1中对应的移动中继的标识。其中，核心网设备基于预存的移动中继的小区配置信息可以如表1所示。
表1
如表1所示，表1中示出了多个移动中继的标识和小区信息的对应关系，例如，移动中继的标识#1对应的小区信息为TAC#1，Cell ID#1。
应理解，表1中的TAC可以替换为TAI，TAI由TAC和公共陆地移动网络(public land mobile network，PLMN)组成。
方式三：如果终端设备在注册请求消息中向核心网设备发送了移动中继的标识，则核心网设备可以从注册请求消息中获取到移动中继的标识。
其中，第一接入网设备根据第一信息确定移动中继的方法，如下所示：
方式一：如果第一信息包含的是移动中继的标识，第一接入网设备根据移动中继的标识确定移动中继。
方式二：如果第一信息包含的是第一小区对应的TAC，第一接入网设备基于预存的移动中继的小区配置信息(如表1所示)确定第一小区对应的移动中继的标识。
方式三：如果第一信息包含的是第一小区的Cell ID，第一接入网设备基于预存的移动中继的小区配置信息(如表1所示)确定第一小区对应的移动中继的标识。
方式四：如果第一信息包含的是终端设备的标识，第一接入网设备基于终端设备的标识确定该终端设备当前接入的移动中继是哪个。可选地，第一消息中还携带如下一项或多项：移动中继的位置信息的上报周期、移动中继的位置信息类型、以及核心网设备的标识，移动中继的位置信息类型包括移动中继所接入的小区的TAC和/或Cell ID。
核心网设备还可以给第一接入网设备指示移动中继的位置信息的上报周期，即多久上报一次移动中继的位置信息；还可以指示移动中继的位置信息类型，也即，给第一接入网设备指示需要上报移动中继接入的小区的TAC，还是Cell ID，还是二者都上报；还可以指示核心网设备的标识，也即，指示第一接入网设备将移动中继的位置信息上报给哪个核心网设备，上述核心网设备是服务于终端设备的核心网设备。
步骤603，第一接入网设备向核心网设备发送第一位置信息。
其中，第一位置信息是移动中继当前接入的第二小区对应的TAC和/或Cell ID，第二小区为第一接入网设备的小区，也即，第一接入网设备上报移动中继当前接入的第一接入网设备的小区对应的TAC和/或Cell ID。
示例性地，第一接入网设备接收到来自核心网设备的第一消息后，触发其上报移动中继当前接入的第二小区对应的TAC和/或Cell ID，例如，可以通过位置上报(location report)消息携带上述移动中继当前接入的第二小区对应的TAC和/或Cell ID。
其中，第一接入网设备确定第一位置信息的方法可以是：第一接入网设备根据本地存储的上下文信息确定移动中继当前接入的小区是第二小区，进一步地，确定第二小区对应 的TAC和/或Cell ID。
应理解，第一接入网设备上报的第二小区的小区信息的类型可以通过核心网设备指示。
步骤604，核心网设备基于移动中继的第一位置信息，确定终端设备的位置信息。
核心网设备接收到来自第一接入网设备的移动中继的位置信息后，基于该移动中继的位置信息，确定接入移动中继的终端设备的位置信息。
一种可能的实现方式是，核心网设备将移动中继的第一位置信息作为终端设备的位置信息。示例性地，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，核心网设备可以使用上述第二小区对应TAC和/或Cell ID来代表终端设备的位置。
作为另一种可能的实现方式，核心网设备将移动中继的第一位置信息以及终端设备接入的移动中继的第一小区的位置信息一起作为终端设备的位置信息。示例性地，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，终端设备接入的移动中继的第一小区的位置信息包括第一小区对应的TAC和/或Cell ID。核心网设备同时使用上述第一小区对应TAC和/或Cell ID以及上述第二小区对应TAC和/或Cell ID来代表终端设备的位置(即终端设备的位置信息同时包含第一小区对应TAC和/或Cell ID以及第二小区对应TAC和/或Cell ID)。
可选地，图6所示的方法600还包括：第一接入网设备将第一信息中携带的移动中继的标识、移动中继的位置信息的上报周期、移动中继的位置信息类型、以及核心网设备的标识中的一项或多项存储在移动中继的上下文中。
可选地，图6所示的方法600还包括：核心网设备将终端设备的位置信息存储在接入该移动中继的终端设备的上下文(UE context)中，其中，终端设备的位置信息是核心网设备基于移动中继的位置信息确定的。
例如，上述终端设备的位置信息可以是移动中继的位置信息(如移动中继接入的小区对应的TAC和/或Cell ID)。又例如，上述终端设备的位置信息可以包含移动中继的位置信息和第一小区的信息(如移动中继接入的小区对应的TAC和/或Cell ID以及第一小区对应的TAC和/或Cell ID，也即，终端设备的位置信息同时包含第一小区对应TAC和/或Cell ID以及第二小区对应TAC和/或Cell ID)。
可选地，图6所示的方法600还包括：核心网设备接收来自第二接入网设备的移动中继的第二位置信息，该第二位置信息包括移动中继接入的第三小区对应的TAC和/或Cell ID，第三小区为第二接入网设备的小区；基于接收到的第二位置信息，确定终端设备的位置发生变化。
某个时刻，移动中继发生了移动(可以认为终端设备跟随者移动中继一起发生了移动)，移动中继更换了接入网设备(如更换了宿主基站)的情况下，例如，移动中继由第一接入网设备切换至第二接入网设备，也即，移动中继由接入到第一接入网设备的小区切换至接入第二接入网设备的小区，以由第二小区切换至第三小区为例，第二接入网设备向核心网设备上报移动中继的第二位置信息，相应地，核心网设备可以接收来自第二接入网设备的移动中继的第二位置信息，该第二位置信息包括移动中继接入的第三小区对应的TAC和/或Cell ID。
一种可能的实现方式是，可以通过如下方式触发第二接入网设备向核心网设备上报移动中继的第二位置信息：第二接入网设备接收到来自第一接入网设备的移动中继的上下文 信息，该上下文信息中包括位置上报信息(location reporting information)，如核心网设备的标识。第二接入网设备接收到移动中继的上下文信息后，上报移动中继当前接入的接入网设备的小区对应的TAC和/或Cell ID。
核心网设备接收到第二位置信息后，基于第二位置信息，可以确定终端设备的位置发生变化，例如，第一位置信息包括第二小区的TAC和/或Cell ID，第二位置信息包括第三小区的TAC和/或Cell ID，二者不同。
可以理解，移动中继可以基于Xn接口或N2接口来切换接入网设备，下面将分别描述移动中继基于上述两种接口切换时传递上下文信息的过程。
在移动中继基于Xn接口来切换的场景下，第一接入网设备通过Xn接口将移动中继的上下文信息传递给第二接入网设备，该移动中继的上下文信息例如包括核心网设备的标识，该核心网设备为服务于终端设备的核心网设备。
在移动中继基于N2接口来切换的场景下，第一接入网设备通过核心网设备将移动中继的上下文信息转发给第二接入网设备，该移动中继的上下文信息例如包括核心网设备的标识，该核心网设备为服务于终端设备的核心网设备。
示例性地，第一接入网设备向服务移动中继的AMF发送切换请求(Handover Required)消息，其中，切换请求消息中包含第一接入网设备向第二接入网设备发送的上下文信息，该上下文信息可以用源到目标透明容器(source to target transparent container)来传输，上下文信息中还包含了位置上报信息(location reporting information)，如核心网设备的标识。服务移动中继的AMF向第二接入网设备发送切换请求消息，其中，该切换请求消息中携带第一接入网设备向第二接入网设备发送的上下文信息。
图7和图8是对图6所示的实施例中所述的通信方法的一示例。图7和图8所示的实施例的不同之处在于，移动中继发生移动，切换接入网设备的情况下，图7是基于Xn接口来切换，图8是基于N2接口来切换。
如图7所示，图7所示的方法包括步骤701至步骤719，下面将对图7所示方法的各个步骤进行详细描述。应理解，图7中所示的方法中，移动中继以VMR为例，核心网设备以AMF为例进行描述。该AMF是服务终端设备的AMF。
步骤701，第一接入网设备发送广播消息。
该广播消息中携带第一接入网设备的小区对应的TAC和/或Cell ID。VMR的MT功能选择接入该第一接入网设备的小区并注册到网络中。
步骤702，VMR从OAM获取VMR的小区的配置信息，执行小区的激活流程。
其中，VMR的小区的配置信息包括VMR的小区对应的TAC和/或Cell ID。VMR的DU功能向第一接入网设备发送F1配置请求消息，用于执行VMR的小区的激活，该流程可以参考已知的技术。
VMR的小区激活后，VMR可以向终端设备发送广播消息，该广播消息中包含VMR的小区的信息，如TAC和/或Cell ID。可选地，该广播消息还可以包含用于指示该小区是移动中继的小区的指示信息。终端设备通过VMR的小区进行接入并发起注册流程。换言之，终端设备当前接入的小区是VMR的小区(UE接入的VMR的小区跟VMR接入的第一接入网设备的小区是不同的小区)。可以理解，VMR具备移动性，该VMR的小区也处于移动状态。
步骤703，终端设备向第一接入网设备发送RRC建立请求(RRC setup request)消息。相应地，第一接入网设备接收来自终端设备的RRC建立请求消息。
对于处于RRC空闲(idle)态的终端设备，该终端设备可以经由移动中继向第一接入网设备发送RRC建立请求消息。也就是说，该终端设备希望通过移动中继接入网络。
第一接入网设备接收到RRC建立请求消息后，可以为终端设备选择AMF网元。
步骤704，第一接入网设备向AMF发送N2消息，该N2消息中携带终端设备接入的小区(如小区1)的信息和注册请求消息。例如终端设备当前接入的VMR的小区对应的TAI和/或Cell ID。
可选地，该N2消息中还可以携带VMR的标识。
其中，TAI包含TAC。VMR的标识指的是终端设备当前接入的VMR对应的标识，用于标识某个VMR，Cell ID用于标识终端设备当前接入的VMR的某个小区。
步骤705，AMF确定小区1是VMR的小区。
AMF确定小区1是VMR的小区的具体方法可以是：
方式一，AMF从第一接入网设备接收小区1的TAI和/或Cell ID，AMF基于预存的配置信息和小区1的TAI和/或Cell ID，确定小区1是移动中继的小区，示例性地，AMF本地存储的配置信息如表2所示，小区1的TAI为TAI#1，Cell ID为Cell ID#1，AMF确定该小区1是移动中继的小区。
表2
作为另一种实现方式，AMF预存的配置信息还可以包括对应的VMR ID，如下所示：
表3
如表3所示，表3中示出了多个VMR ID和小区信息的对应关系，例如，VMR ID#1对应的小区信息为TAI#1，Cell ID#1。
需要注意的是，AMF还可以通过其他网元获取上述配置信息。
方式二，AMF从第一接入网设备或者终端设备接收第二信息，该第二信息用于指示终端设备接入的小区是移动中继的小区。也就是说，第一接入网设备可以向核心网设备指示终端设备接入的小区是移动中继的小区。或者，终端设备向核心网设备指示终端设备接入的小区是移动中继的小区。
例如，第一接入网设备预配中继设备是否是移动中继的配置信息，当第一接入网设备通过移动中继接收终端设备的请求消息之后，第一接入网设备可以在N2消息中向AMF指示终端设备接入的小区是移动中继的小区。
例如，终端设备接收第一小区的广播消息，该广播消息中携带用于指示该小区是移动 中继的小区的指示信息，终端设备在注册请求消息中向AMF指示终端设备接入的小区是移动中继的小区。可选地，如果广播消息中还携带了VMR ID，终端设备还可以在注册请求消息中向AMF发送该VMR ID。
步骤706，AMF向第一接入网设备发送第一消息，用于请求第一接入网设备上报VMR的位置信息。
例如，第一消息可以是位置上报控制消息(location reporting control)。第一消息中携带有第一信息，第一信息用于确定移动中继。
可选地，第一信息包括以下一种或者多种：VMR ID；第一小区对应的TAC；或第一小区的Cell ID；或终端设备的标识。其中，终端设备的标识可以RAN UE NGAP ID来表示。
其中，AMF可以通过如下任一种方式确定VMR ID：
方式一：如果N2消息中包含了VMR ID，AMF可以从N2消息中获取VMR ID。
方式二：AMF基于预存的配置信息(如上述表3所示)以及小区1的TAI和/或Cell ID，确定小区1对应的VMR ID。
方式三：如果终端设备在注册请求消息中向AMF发送了VMR ID，AMF可以从注册请求消息中获取VMR ID。
第一接入网设备收到第一消息之后，确定上报哪个VMR的位置信息，示例性地，第一接入网设备确定VMR的方法如下：
方式一：如果第一信息包含的是VMR ID，第一接入网设备根据VMR ID确定VMR。
方式二：如果第一信息包含的是第一小区对应的TAC，第一接入网设备基于预存的VMR的小区配置信息(如表3所示)确定第一小区对应的VMRID。
方式三：如果第一信息包含的是第一小区的Cell ID，第一接入网设备基于预存的VMR的小区配置信息(如表3所示)确定第一小区对应的VMR ID。
方式四：如果第一信息包含的是RAN UE NGAP ID，第一接入网设备基于RAN UE NGAP ID确定该终端设备当前接入的移动中继是哪个。
步骤707，第一接入网向AMF发送位置上报(location report)消息，该位置上报消息中携带VMR的第一位置信息。
其中，VMR的第一位置信息可以用该VMR当前接入的第一接入网设备的小区(如小区2)对应的TAI和/或Cell ID来表示，其中，TAI包含TAC。
第一接入网设备确定第一位置信息的方法可以是：第一接入网设备根据本地存储的上下文信息确定VMR当前接入的小区是第二小区，进一步地，确定第二小区对应的TAC和/或Cell ID。
步骤708，存储位置信息。
步骤708包括步骤708a和步骤708b。
步骤708a、第一接入网设备将第一消息中的相关信息存储在VMR的上下文中。
例如，第一接入网设备将VMR ID、VMR的位置信息的上报周期、VMR的位置信息类型(如TAI和/或Cell ID)以及AMF标识，存储在VMR的上下文中。
步骤708b、AMF基于VMR的位置信息确定终端设备的位置信息。并且将其存储在终端设备的上下文中。
一种可能的实现方式是，AMF将VMR的第一位置信息作为终端设备的位置信息。示例性地，第一位置信息包括VMR当前接入的第二小区对应的TAC和/或Cell ID，AMF可以使用上述第二小区对应TAC和/或Cell ID来代表终端设备的位置。
作为另一种可能的实现方式，AMF将VMR的第一位置信息以及终端接入的VMR的第一小区的位置信息一起作为终端设备的位置信息。示例性地，第一位置信息包括VMR当前接入的第二小区对应的TAC和/或Cell ID，终端接入的VMR的第一小区的位置信息包括第一小区对应的TAC和/或Cell ID。AMF同时使用上述第一小区对应TAC和/或Cell ID以及上述第二小区对应TAC和/或Cell ID来代表终端设备的位置(即终端设备的位置信息同时包含第一小区对应TAC和/或Cell ID以及第二小区对应TAC和/或Cell ID)。
步骤709，执行注册流程中的其他步骤，可以参考已知的终端设备的注册流程，此处不再赘述。
步骤710，终端设备发起会话建立流程，触发建立新的会话。
步骤711，AMF向SMF发送会话建立请求消息，该会话建立请求消息中携带终端设备的位置信息。由于AMF已经通过了第一接入网设备获取了VMR的位置信息，因此AMF基于VMR的位置信息确定了终端设备的位置信息。作为一种实现方式，会话建立请求消息中携带的终端设备的位置信息可以是终端设备当前接入的VMR的位置信息(即小区2的信息)。例如，会话建立请求消息中携带VMR当前接入的第一接入网设备的小区2对应的TAI。
作为另一种实现方式，会话建立请求消息中携带的终端设备的位置信息可以包含终端设备当前接入的VMR的位置信息以及小区1的信息。例如，会话建立请求消息中携带VMR当前接入的第一接入网设备的小区2对应的TAI以及小区1对应的TAI。
可选地，为了帮助SMF区分小区2对应的TAI以及小区1对应的TAI，会话建立请求消息中还可以携带指示信息，用于指示SMF哪个TAI是小区1的参数，哪个TAI是小区2的参数。步骤712，SMF根据终端设备的位置信息选择用户面网元。
其中，上述终端设备的位置信息可以是VMR的位置信息(如VMR接入的小区对应的TAC和/或Cell ID)，或者，终端设备的位置信息包含VMR的位置信息和终端设备接入的小区的信息(如小区1对应的TAC和/或Cell ID)。
例如，SMF根据VMR当前接入的第一接入网设备的小区2对应的TAI选择用户面网元。再例如，SMF根据VMR当前接入的第一接入网设备的小区2对应的TAI以及小区1对应的TAI共同选择用户面网元。
步骤713，VMR发生移动，更换接入网设备，执行N2切换。
示例性地，VMR的MT功能从第一接入网设备切换到第二接入网设备，然后，VMR的DU功能跟第二接入网设备建立F1连接，由第二接入网设备激活VMR的小区。其中，VMR的MT功能从第一接入网设备切换到第二接入网设备，可以理解为，VMR的MT功能从第一接入网设备的小区接入到第二接入网设备的小区，即VMR当前接入的小区发生了改变，如，VMR当前接入的小区从第一接入网设备的小区2变成了第二接入网设备的小区3，其中，小区2对应的TAC和/或Cell ID跟小区3对应的TAC和/或Cell ID不同。
需要注意的是，VMR的MT功能从第一接入网设备切换到第二接入网设备之后，该VMR的小区信息可能不会发生改变，例如小区1对应的TAC依然保持不变。
步骤714，在切换过程中，第一接入网设备向第二接入网设备传递上下文信息。
例如，第一接入网设备通过Xn接口将VMR的上下文信息传递给第二接入网设备，其中，VMR的上下文信息中包括位置上报信息(location reporting information)，该位置上报信息包含了如下一项或多项：VMR标识、VMR的位置信息的上报周期、VMR的位置信息类型(如TAI和/或Cell ID)以及AMF标识，其中，AMF标识指的是服务终端设备的AMF的标识。
步骤715，第二接入网设备向AMF发送位置上报(location report)消息。
该位置上报消息中携带VMR当前接入的第二接入网设备的小区的信息，如小区3的信息，其中，小区3的信息包括小区3对应的TAC和/或Cell ID。
步骤716，AMF向SMF发送终端设备移动通知。
由于AMF从第二接入网设备接收到了VMR的位置信息，该位置信息跟从第一接入网设备接收的位置信息不同。AMF认为终端设备发生了移动，因此向SMF发送终端设备移动通知(UE mobility notification)，例如该通知中可以携带VMR当前接入的小区的TAI(该TAI与第二接入设备的小区3对应)。可选地，该通知中还可以携带终端设备接入的VMR的小区的TAI。
可以理解，当上述通知中携带了VMR当前接入的小区(如小区2)的TAI和终端设备接入的VMR的小区(如小区1)的TAI时，为了帮助SMF区分VMR当前接入的小区对应的TAI以及终端设备接入的VMR的小区对应的TAI，上述通知中还可以携带指示信息，用于指示SMF哪个TAI是小区1的参数，哪个TAI是小区2的参数。
步骤717，SMF确定是否进行锚点迁移。
示例性地，SMF根据终端设备当前的位置决定是否需要执行锚点迁移。例如，如果SMF判断终端设备在当前位置下，之前选择的锚点用户面到接入网设备的N3接口的用户面路径已经不优，则SMF可以选择进行锚点迁移，具体地，SMF可以为当前会话选择本地锚点，从而将数据直接路由到本地，优化用户面的路由路径，减少数据传输的时延。
步骤718，其他网元(如AF或NEF)向AMF发送订阅请求消息。
该订阅请求消息用于请求订阅终端设备的位置信息。
步骤719，AMF向其他网元发送终端设备的位置信息。
例如，AMF根据订阅请求消息，将基于终端设备当前接入的VMR的位置信息确定的终端设备的位置信息发送给其他网元。再例如，AMF将基于终端设备当前接入的VMR的位置信息以及终端当前接入的小区信息确定的终端设备的位置信息发给其他网元。
需要说明的是，实施例中的SMF/AF/NEF从AMF获取终端设备的位置信息只是示例，不排除其他其他网元从AMF获取终端设备的位置信息的场景。
图8是基于N2接口来切换的场景下的通信方法的一示例。图8所示的实施例与图7所示的实施例不同之处在于图8中的步骤813至步骤815，其他步骤与图7类似。如图8所示，图8所示的方法包括步骤801至步骤818，下面将对图8所示方法的各个步骤进行详细描述。应理解，图8中所示的方法中，移动中继以VMR为例，核心网设备以AMF为例进行描述，其中，AMF 1是服务终端设备的核心网设备，AMF 2是服务VMR的核心网设备。
步骤801，第一接入网设备发送广播消息。
步骤802，VMR从OAM获取VMR的小区的配置信息，执行小区的激活流程。
步骤803，终端设备向第一接入网设备发送RRC建立请求(RRC setup request)消息。相应地，第一接入网设备接收来自终端设备的RRC建立请求消息。
步骤804，第一接入网设备向AMF 1发送N2消息，该N2消息中携带终端设备接入的小区(如小区1)的信息和注册请求消息。例如终端设备当前接入的VMR的小区对应的TAI和/或Cell ID。
可选地，该N2消息中还可以携带VMR ID。
步骤805，AMF 1确定小区1是VMR的小区。
步骤806，AMF 1向第一接入网设备发送第一消息，用于请求第一接入网设备上报VMR的位置信息。
步骤807，第一接入网设备向AMF 1发送位置上报(location report)消息，该位置上报消息中携带VMR的第一位置信息。
其中，第一接入网设备确定第一位置信息的方法可以是：第一接入网设备根据本地存储的上下文信息确定VMR当前接入的小区是第二小区，进一步地，确定第二小区对应的TAC和/或Cell ID。
步骤808，存储位置信息。
步骤808包括步骤808a和步骤808b。
步骤808a、第一接入网设备将第一消息中的相关信息存储在VMR的上下文中。
步骤808b、AMF 1基于VMR的位置信息确定终端设备的位置信息。并且将其存储在终端设备的上下文中。
步骤809，执行注册流程中的其他步骤，可以参考已知的终端设备的注册流程，此处不再赘述。
步骤810，终端设备发起会话建立流程，触发建立新的会话。
步骤811，AMF 1向SMF发送会话建立请求消息，该会话建立请求消息中携带终端设备的位置信息。
作为一种实现方式，会话建立请求消息中携带的终端设备的位置信息可以是终端设备当前接入的VMR的位置信息(即小区2的信息)。例如，会话建立请求消息中携带VMR当前接入的第一接入网设备的小区2对应的TAI。
作为另一种实现方式，会话建立请求消息中携带的终端设备的位置信息可以包含终端设备当前接入的VMR的位置信息以及小区1的信息。例如，会话建立请求消息中携带的终端设备的位置信息包含VMR当前接入的第一接入网设备的小区2对应的TAI以及小区1对应的TAI。
可选地，为了帮助SMF区分小区2对应的TAI以及小区1对应的TAI，会话建立请求消息中还可以携带指示信息，用于指示SMF哪个TAI是小区1的参数，哪个TAI是小区2的参数。
步骤812，SMF根据终端设备的位置信息选择用户面网元。
需要说明的是，步骤801至步骤812的具体的过程可以参看图7的描述，此处不再赘述。
步骤813，VMR发生移动，更换接入网设备，执行N2切换。
通过N2接口的切换，VMR的MT功能从第一接入网设备切换到第二接入网设备，然后VMR的DU功能跟第二接入网设备建立F1连接，由第二接入网设备激活VMR的小区。其中，VMR的MT功能从第一接入网设备切换到第二接入网设备，可以理解为，VMR的MT功能从洗衣接入网设备的小区接入到第二接入网设备的小区，即VMR当前接入的小区发生了改变，例如，VMR当前接入的小区从第一接入网设备的小区2变成了第二接入网设备的小区3，其中，小区2对应的TAC和/或Cell ID跟小区3的对应的TAC和/或Cell ID不同。
需要注意的是，VMR的MT功能从第一接入网设备切换到第二接入网设备之后，该VMR的小区信息可能不会发生改变，例如小区1对应的TAC依然保持不变。
步骤814，在切换过程中，第一接入网设备向AMF 2发送切换请求消息，该切换请求消息中携带上下文信息。
例如，第一接入网设备向服务VMR的AMF 2发送切换请求(Handover Required)消息，其中，切换请求消息中包含第一接入网设备向第二接入网设备发送的上下文信息，该上下文信息可以用源到目标透明容器(source to target transparent container)来传输，上下文信息中还包含了位置上报信息(location reporting information)，如AMF 1的标识。
步骤815，AMF 2向第二接入网设备发送切换请求消息，该切换请求消息中携带上下文信息。
步骤816，第二接入网设备向AMF 1发送位置上报(location report)消息。
该位置上报消息中携带VMR当前接入的第二接入网设备的小区的信息，如小区3的信息，其中，小区3的信息包括小区3对应的TAI和/或Cell ID。
步骤817，AMF 1向SMF发送终端设备移动通知。
步骤818，SMF确定是否进行锚点迁移。
步骤817和步骤818的具体描述可以参看图7所示的实施例，此处不再详细描述。
需要说明的是，实施例中的SMF/AF/NEF从AMF获取终端设备的位置信息只是示例，不排除其他其他网元从AMF获取终端设备的位置信息的场景。
基于上述技术方案，核心网设备在确定终端设备接入的小区是移动中继的小区后，向移动中继当前接入的接入网设备请求移动中继的位置信息，并在接收到来自接入网设备的移动中继的当前的位置信息后，基于上述移动中继的位置信息确定终端设备的位置信息，其中，位置信息包括移动中继当前接入的接入网设备的小区对应的TAC和/或Cell ID，核心网设备通过获取到的移动中继的位置信息，确定终端设备的位置信息，本申请提供了一种接入移动中继的终端设备在移动场景下，如何获取终端设备的位置信息的方法，解决了由于终端设备接入的移动中继的小区信息与终端设备当前的实际位置不匹配的问题，换言之，虽然移动中继的小区信息无法反映出终端设备的实际位置信息，核心网设备也可以准确地确定到终端设备的实际位置。
下面对本申请实施例提供的另一通信方法(即上文提及的第二种可能的设计)进行详细描述，也即，第一接入网设备在确定终端设备接入的小区是移动中继的小区后，主动向服务于终端设备的核心网设备上报移动中继当前的位置信息，以便于核心网设备基于移动中继的当前的位置信息确定终端设备的位置信息，其中，位置信息包括移动中继当前接入的第一接入网设备的小区对应的TAC和/或Cell ID。
需要说明的是，上述核心网设备是服务于终端设备的核心网设备，移动中继用于在终端设备和第一接入网设备之间提供中继服务。第一接入网设备是当前为移动中继提供服务的接入网设备，可以理解为移动中继当前接入的接入网设备，移动中继在移动的过程中会切换接入网设备，换言之，还会有第二接入网设备、第三接入网设备等为移动中继提供服务。
图9是本申请实施例提供的通信方法900的示意性流程图。图9所示的方法900可以包括步骤901至步骤903。下面详细说明方法900中的各个步骤。
步骤901，第一接入网设备确定终端设备接入的第一小区是移动中继的小区。
其中，第一小区是终端设备当前接入的移动中继的小区。其中，终端设备接入的第一小区是移动中继的小区，可以理解为，终端设备接入移动中继，也即终端设备可以基于移动中继接入网络。
前已述及，终端设备接入的第一小区是移动中继的小区，当移动中继发生移动时，移动中继的第一小区的小区信息可能一直都保持不变或者无法及时更新，也即，移动中继的小区的小区信息与终端设备的位置无法匹配，这种情况下，可以通过本申请提供的方法，以确定终端设备的位置信息。
第一接入网设备确定终端设备接入的第一小区是移动中继的小区，可以通过如下任一种可能方式确定：
方式一，第一接入网设备基于预存的配置信息和第一小区的信息，确定第一小区是移动中继的小区，其中，第一小区的信息包括第一小区对应的TAC和/或Cell ID，预存的配置信息包括移动中继的小区信息，该小区信息包括TAC和/或Cell ID，移动中继的小区信息包括第一小区的信息。换言之，第一接入网设备预存有移动中继的小区信息，包括TAC和/或Cell ID，第一接入网设备将第一小区的信息和预存的移动中继的小区信息对比，若第一小区的信息包含在移动中继的小区信息中，则确定第一小区是移动中继的小区。其中，第一接入网设备预存的配置信息可以参看表2所示的AMF预存的移动中继的小区配置信息。
应理解，第一接入网设备中可以预存有移动中继的小区对应的TAC，或Cell ID，或TAC和Cell ID，本申请实施例对此不作限定。
方式二，第一接入网设备从移动中继或者终端设备接收第一指示信息，该第一指示信息用于指示第一小区为具有移动性的小区，和/或，移动中继具有移动性。一示例，终端设备可以向第一接入网设备指示终端设备接入的小区为具有移动性的小区。比如，终端设备在RRC消息中向第一接入网设备指示终端设备接入的小区为具有移动性的小区。又一示例，移动中继向第一接入网设备指示移动中继具有移动性。比如，移动中继向第一接入网设备发送的F1建立请求(F1setup request)消息中，携带移动中继具有移动性的指示信息。
综上，上述任一种方式均可以使得第一接入网设备确定终端设备接入的第一小区是移动中继的小区，也即，上述任一种方式均可以触发第一接入网设备向核心网设备上报移动中继的位置信息。第一接入网设备还可以通过其他方法确定终端设备接入的第一小区是移动中继的小区，比如第一接入网设备还可以通过OAM配置获取网络中哪些中继设备是移动中继。因此本申请并不限定第一接入网设备确定终端设备接入的第一小区是移动中继的小区的具体实现方式。
步骤902，第一接入网设备向核心网设备发送移动中继的第一位置信息。
其中，第一位置信息是移动中继当前接入的第二小区对应的TAC和/或Cell ID，第二小区为第一接入网设备的小区，也即，第一接入网设备上报移动中继当前接入的第一接入网设备的第二小区对应的TAC和/或Cell ID。
其中，第一接入网设备确定第一位置信息的方法可以是：第一接入网设备根据本地存储的上下文信息确定移动中继当前接入的小区是第二小区，进一步地，确定第二小区对应的TAC和/或Cell ID。
示例性地，第一接入网设备确定终端设备接入的第一小区是移动中继的小区后，主动上报移动中继当前接入的第二小区对应的TAC和/或Cell ID。
可选地，第一接入网设备向服务于终端设备的核心网设备发送移动中继的第一位置信息，包括：向核心网设备发送N2消息，该N2消息中包括第一位置信息。
示例性地，第一接入网设备可以将移动中继当前接入的第二小区对应的TAC和/或Cell ID携带在N2消息中，发送给核心网设备。
可选地，N2消息中还包括以下一种或者多种：第一小区对应的TAC；第一小区的Cell ID；或终端设备的NAS消息。
其中，NAS消息包括：注册请求消息、注册更新请求消息或业务请求消息。示例性地，N2消息中携带有移动中继标识、第一位置信息(如第二小区对应的TAC和/或Cell ID)、终端设备当前接入的移动中继的小区对应的TAC和/或Cell ID等。其中，移动中继标识用于标识终端设备当前接入的移动中继。可选地，N2消息中还包含终端设备的注册请求消息。
可以理解为，一种实现方法为，当第一接入网设备收到了来自终端设备的NAS消息，第一接入网设备向核心网设备发送N2消息，该N2消息中携带了NAS消息(如注册请求消息)、终端设备当前接入的移动中继的小区对应的TAC和/或Cell ID以及移动中继的第一位置信息。即第一接入网设备可以收到终端设备的NAS消息时，一并向核心网设备发送NAS消息以及移动中继的第一位置信息。
作为另一种实现方法，如果第一接入网设备没有收到来自终端设备的NAS消息，第一接入网设备也可以向核心网设备发送移动中继的第一位置信息。即第一接入网设备不依赖收到终端设备的NAS消息，可以直接向核心网设备发送移动中继的第一位置信息。
可以理解，N2消息中可能会包含移动中继接入的小区(如第二小区)对应的TAC和/或Cell ID，以及终端设备接入的第一小区的TAC和/或Cell ID。为了帮助核心网设备区分第一小区对应的TAC和/或Cell ID和第二小区对应的TAC和/或Cell ID，可选地，N2消息中还可以携带指示信息，用于指示哪些TAC和/或Cell ID是第一小区的参数，哪些TAC和/或Cell ID是第二小区的参数。这样核心网设备就可以区分出N2消息中携带的多个TAC和/或Cell ID。
示例性地，作为一种实现方式，N2消息中携带用于标识用户位置信息(user location information，URL)的信元，该URL用于表示终端设备的位置信息，根据上述描述，URL包含第一小区对应的TAC和/或Cell ID。此外，N2消息中还携带用于标识移动中继的位置信息(VMR location information，VMRLI)的信元，该VMRLI用于标识移动中继的位置信息，根据上述描述，VMRLI包含第二小区对应的TAC和/或Cell ID。核心网设备收到URL和VMRLI之后，就可以区分出哪些参数是第一小区的参数(即URL中包含的参数)， 哪些TAC和/或Cell ID是第二小区的参数(即VMRLI中包含的参数)。
作为另一种实现方式，N2消息中携带用于标识URL的信元，该URL用于标识终端设备的位置信息，根据上述描述，URL包含第一小区对应的TAC和/或Cell ID、第二小区对应的TAC和/或Cell ID以及指示信息。指示信息用于指示第二小区对应的TAC和/或Cell ID是终端设备当前接入的VMR当前接入的第一接入网设备的第二小区(如小区2)对应的TAC和/或Cell ID。核心网设备收到URL之后，就可以区分出URL中哪些是第一小区的参数，哪些是第二小区的参数。
步骤903，核心网设备基于移动中继的第一位置信息，确定终端设备的位置信息。
核心网设备接收到来自第一接入网设备的移动中继的位置信息后，基于该移动中继的位置信息，确定接入移动中继的终端设备的位置信息。
一种可能的实现方式是，核心网设备将移动中继的位置信息作为终端设备的位置信息。示例性地，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，核心网设备可以使用上述TAC和/或Cell ID来代表终端设备的位置。
作为另一种可能的实现方式，核心网设备将移动中继的第一位置信息以及终端接入的移动中继的第一小区的位置信息一起作为终端设备的位置信息。示例性地，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，终端接入的移动中继的第一小区的位置信息包括第一小区对应的TAC和/或Cell ID。核心网设备同时使用上述第一小区对应TAC和/或Cell ID以及上述第二小区对应TAC和/或Cell ID来代表终端设备的位置(即终端的位置信息同时包含第一小区对应TAC和/或Cell ID以及第二小区对应TAC和/或Cell ID)。
可选地，图9所示的方法900还包括：第一接入网设备将移动中继的标识、移动中继的位置信息的上报周期、移动中继的位置信息类型、以及核心网设备的标识中的一项或多项存储在移动中继的上下文中。其中，移动中继的位置信息类型包括移动中继接入的小区对应的TAC和/或Cell ID。
可选地，图9所示的方法900还包括：核心网设备将终端设备的位置信息存储在终端设备的上下文中，其中，终端设备的位置信息是核心网设备基于移动中继的位置信息确定的。
例如，上述终端设备的位置信息可以是移动中继的位置信息(如移动中继接入的小区对应的TAC和/或Cell ID)。又例如，上述终端设备的位置信息可以包含移动中继的位置信息和第一小区的信息(如移动中继接入的小区对应的TAC和/或Cell ID以及第一小区对应的TAC和/或Cell ID)。
可选地，图9所示的方法900还包括：第一接入网设备还可以确定移动中继的位置信息的上报周期和/或上报条件，其中，上报条件包括移动中继接入的小区由第二小区切换至第三小区，第二小区和第三小区是第一接入网设备的小区，第二小区与第三小区的TAC和/或Cell ID不同。
可以理解，当移动中继发生移动时，移动中继可能由第一接入网设备的某一小区切换至第一接入网设备的另一小区，而两个小区的TAC和/或Cell ID不同，这种情况下，第一接入网设备可以向核心网设备上报移动中继当前接入的小区对应的TAC和/或Cell ID。
示例性地，第一接入网设备确定移动中继由小区2切换至小区3，小区2和小区3均 为第一接入网设备的小区，小区2与小区3的TAC和/或Cell ID不同，则第一接入网设备可以通过位置上报消息上报移动中继当前的第二位置信息，也即小区3对应的TAC和/或Cell ID。相应地，核心网设备接收来自第一接入网设备的移动中继当前的第二位置信息，也即小区3对应的TAC和/或Cell ID。
需要注意的是，移动中继接入的小区由第一接入网设备的第二小区切换至第一接入网设备的第三小区，该移动中继的小区信息可能不会发生改变，例如小区1对应的TAC依然保持不变。
可选地，图9所示的方法900还包括：核心网设备接收来自第二接入网设备的移动中继的第三位置信息，该第三位置信息包括移动中继当前接入的第四小区对应的TAC和/或Cell ID，第四小区是第二接入网设备的小区。相应地，第二接入网设备向核心网设备发送移动中继的第三位置信息。
某个时刻，移动中继发生了移动(可以认为终端设备跟随者移动中继一起发生了移动)，移动中继更换了接入网设备(如更换了宿主基站)的情况下，例如，移动中继由第一接入网设备切换至第二接入网设备，也即，移动中继由接入到第一接入网设备的小区切换至接入第二接入网设备的小区，以由小区2切换至小区4为例，第二接入网设备向核心网设备上报移动中继的第三位置信息，相应地，核心网设备可以接收来自第二接入网设备的移动中继的第三位置信息，该第三位置信息包括移动中继接入的小区4对应的TAC和/或Cell ID。
应理解，本申请实施例中的第一位置信息、第二位置信息以及第三位置信息等，是为例区分不同的小区对应的位置信息，其含义类似，均是指移动中继当前接入的小区对应的TAC和/或Cell ID。
一种可能的实现方式是，可以通过如下方式触发第二接入网设备向核心网设备上报移动中继的第二位置信息：第二接入网设备接收到来自第一接入网设备的移动中继的上下文信息，该上下文信息中包括位置上报信息(location reporting information)，如核心网设备的标识。第二接入网设备接收到移动中继的上下文信息后，上报移动中继当前接入的接入网设备的小区对应的TAC和/或Cell ID。
核心网设备接收到移动中继当前的位置信息，可以确定终端设备的位置是否发生变化，例如，核心网设备接收到的来自第一接入网设备的移动中继的位置信息包括小区2对应的TAC和/或Cell ID，接收到的来自第二接入网设备的移动中继的位置信息包括小区4对应的TAC和/或Cell ID，二者不同，则可以确定移动中继的位置发生变化，也即随着该移动中继一起移动的终端设备的位置发生变化。
可以理解，移动中继可以基于Xn接口或N2接口来切换接入网设备，下面将分别描述移动中继基于上述两种接口切换时传递上下文信息的过程。
在移动中继基于Xn接口来切换的场景下，第一接入网设备通过Xn接口将移动中继的上下文信息传递给第二接入网设备，该移动中继的上下文信息例如包括核心网设备的标识，该核心网设备为服务于终端设备的核心网设备。
在移动中继基于N2接口来切换的场景下，第一接入网设备通过核心网设备将移动中继的上下文信息转发给第二接入网设备，该移动中继的上下文信息例如包括核心网设备的标识，该核心网设备为服务于终端设备的核心网设备。
示例性地，第一接入网设备向服务移动中继的AMF发送切换请求消息，其中，切换 请求消息中包含第一接入网设备向第二接入网设备发送的上下文信息，该上下文信息可以用源到目标透明容器(source to target transparent container)来传输，上下文信息中还包含了位置上报信息，如核心网设备的标识。服务移动中继的AMF向第二接入网设备发送切换请求消息，其中，该切换请求消息中携带第一接入网设备向第二接入网设备发送的上下文信息。
图10和图11是对图9所示的实施例中所述的通信方法的一示例。图10和图11所示的实施例的不同之处在于，移动中继发生移动，切换接入网设备的情况下，图10是基于Xn接口来切换，图11是基于N2接口来切换。
如图10所示，图10所示的方法包括步骤1001至步骤1019，下面将对图10所示方法的各个步骤进行详细描述。应理解，图10中所示的方法中，移动中继以VMR为例，核心网设备以AMF为例进行描述。该AMF是服务终端设备的AMF。
步骤1001，第一接入网设备发送广播消息。
该广播消息中携带第一接入网设备的小区对应的TAC和/或Cell ID。VMR的MT功能选择接入该第一接入网设备的小区并注册到网络中。
步骤1002，VMR从OAM获取VMR的小区的配置信息，执行小区的激活流程。
其中，VMR的小区的配置信息包括VMR的小区对应的TAC和/或Cell ID。VMR的DU功能向第一接入网设备发送F1配置请求消息，用于执行VMR的小区的激活，该流程可以参考已知的技术。
VMR的小区激活后，VMR可以向终端设备发送广播消息，该广播消息中包含VMR的小区的信息，如TAC和/或Cell ID。可选地，该广播消息还可以包含用于指示该小区是移动中继的小区的指示信息。终端设备通过VMR的小区进行接入并发起注册流程。换言之，终端设备当前接入的小区是VMR的小区(UE接入的VMR的小区跟VMR接入的第一接入网设备的小区是不同的小区)。可以理解，VMR具备移动性，该VMR的小区也处于移动状态。
步骤1003，终端设备向第一接入网设备发送RRC建立请求消息。相应地，第一接入网设备接收来自终端设备的RRC建立请求消息。
对于处于RRC空闲(idle)态的终端设备，该终端设备可以经由移动中继向第一接入网设备发送RRC建立请求消息。也就是说，该终端设备希望通过移动中继接入网络。
第一接入网设备接收到RRC建立请求消息后，可以为终端设备选择AMF网元。
步骤1004，第一接入网设备确定终端设备从VMR接入。
也即，第一接入网设备确定终端设备接入的小区(如小区1)是VMR的小区。
第一接入网设备可以通过如下任一种方式确定小区1是VMR的小区：
方式一，第一接入网设备基于预存的配置信息和第一小区的信息，确定第一小区是移动中继的小区，其中，第一小区的信息包括第一小区对应的TAC和/或Cell ID，预存的配置信息包括移动中继的小区信息，该小区信息包括TAC和/或Cell ID，移动中继的小区信息包括第一小区的信息。换言之，第一接入网设备预存有移动中继的小区信息，包括TAC和/或Cell ID，第一接入网设备将第一小区的信息和预存的移动中继的小区信息对比，若第一小区的信息包含在移动中继的小区信息中，则确定第一小区是移动中继的小区。
方式二，第一接入网设备从VMR或者终端设备接收第一指示信息，该第一指示信息 用于指示第一小区为具有移动性的小区，和/或，移动中继具有移动性。一示例，终端设备可以向第一接入网设备指示终端设备接入的小区为具有移动性的小区。比如，终端设备在RRC消息中向第一接入网设备指示终端设备接入的小区为具有移动性的小区。又一示例，VMR可以向第一接入网设备指示移动中继具有移动性。比如，VMR向第一接入网设备发送的F1建立请求(F1setup request)消息中，携带VMR具有移动性的指示信息。
可以理解，第一接入网设备还可以配置VMR的位置信息上报周期或者上报条件，其中，VMR的位置信息上报周期是指第一接入网设备需要多久上报一次VMR的位置信息，上报条件是指当满足配置的上报条件时，第一接入网设备需要将VMR的位置信息上报给服务终端设备的AMF，下面示例性地示出了两种可能的上报条件：
条件一：VMR接入的接入网设备的小区对应的TAC发生了改变。如：VMR从第一接入网设备的第二小区接入到第一接入网设备的第三小区，第二小区和第三小区的TAC不同。
条件二：VMR接入的接入网设备的小区对应的Cell ID发生了改变。如：VMR从第一接入网设备的第二小区接入到第一接入网设备的第三小区，第二小区和第三小区的Cell ID不同。
步骤1005，第一接入网设备向AMF发送N2消息，该N2消息中携带VMR的第一位置信息。
其中，VMR的第一位置信息包括VMR当前接入的第一接入网设备的第二小区(如小区2)对应的TAC和/或Cell ID。
第一接入网设备确定第一位置信息的方法可以是：第一接入网设备根据本地存储的上下文信息确定VMR当前接入的小区是第二小区，进一步地，确定第二小区对应的TAC和/或Cell ID。
该N2消息中还可以携带VMR标识、注册请求消息、终端设备接入的VMR的小区对应的TAC和/或Cell ID。VMR标识指的是终端设备当前接入的VMR对应的标识，用于标识某个VMR。
一种可能的实现方式是，当第一接入网设备收到了来自终端设备的NAS消息，第一接入网设备向AMF发送N2消息，该N2消息中携带了NAS消息(如注册请求消息)、终端设备当前接入的VMR的小区对应的TAC和/或Cell ID以及VMR的第一位置信息。即第一接入网设备可以收到终端设备的NAS消息时，一并向AMF发送NAS消息以及VMR的第一位置信息。
另一种可能的实现方式是，如果第一接入网设备没有收到来自终端设备的NAS消息，第一接入网设备也可以向AMF发送VMR的第一位置信息。即第一接入网设备不依赖收到终端设备的NAS消息，可以直接向AMF发送VMR的第一位置信息。
可以理解，N2消息中可能会包含VMR接入的小区(如第二小区)对应的TAC和/或Cell ID，以及终端设备接入的第一小区的TAC和/或Cell ID。为了帮助AMF区分第一小区对应的TAC和/或Cell ID和第二小区对应的TAC和/或Cell ID，可选地，N2消息中还可以携带指示信息，用于指示哪些TAC和/或Cell ID是第一小区的参数，哪些TAC和/或Cell ID是第二小区的参数。这样AMF就可以区分出N2消息中携带的多个TAC和/或Cell ID。
示例性地，作为一种实现方式，N2消息中携带用于表示URL的信元，该URL用于表 示终端设备的位置信息，根据上述描述，URL包含第一小区对应的TAC和/或Cell ID。此外，N2消息中还携带用于表示VMRLI的信元，该VMRLI用于表示移动中继的位置信息，根据上述描述，VMRLI包含第二小区对应的TAC和/或Cell ID。AMF收到URL和VMRLI之后，就可以区分出哪些参数是第一小区的参数(即URL中包含的参数)，哪些TAC和/或Cell ID是第二小区的参数(即VMRLI中包含的参数)。
作为另一种实现方式，N2消息中携带用于表示用户位置信息(URL，User Location Information)的信元，该URL用于表示终端设备的位置信息，根据上述描述，URL包含第一小区对应的TAC和/或Cell ID、第二小区对应的TAC和/或Cell ID以及指示信息。指示信息用于指示第二小区对应的TAC和/或Cell ID是终端设备当前接入的VMR当前接入的第一接入网设备的第二小区(如小区2)对应的TAC和/或Cell ID。AMF收到URL之后，就可以区分出URL中哪些是第一小区的参数，哪些是第二小区的参数。
步骤1006，执行注册流程中的其他步骤，可以参考已知的终端设备的注册流程，此处不再赘述。
步骤1007，第一接入网设备向AMF发送位置上报(location report)消息。
VMR发生了移动，比如VMR的MT功能从第一接入网设备的第二小区接入到第一接入网设备的第三小区，即满足上报条件，第一接入网设备主动发起位置上报流程，向AMF发送VMR当前的位置信息。
示例性地，第一接入网设备向AMF发送位置上报消息，携带VMR当前的位置信息，其中，VMR当前的位置信息可以用该VMR当前接入的小区对应的TAC和/或Cell ID来表示。
步骤1008，终端设备发起会话建立流程。
步骤1009，AMF向SMF发送会话建立请求消息，该会话建立请求消息中携带终端设备的位置信息。由于AMF已经通过了第一接入网设备获取了VMR的位置信息，AMF基于VMR的位置信息确定了终端设备的位置信息。作为一种实现方式，会话建立请求消息中携带的终端设备的位置信息可以是终端设备当前接入的VMR的位置信息(即小区2的信息)。例如，会话建立请求消息中携带VMR当前接入的第一接入网设备的小区2对应的TAI。
可选地，为了帮助SMF区分小区2对应的TAI以及小区1对应的TAI，会话建立请求消息中还可以携带指示信息，用于指示SMF哪个TAI是小区1的参数，哪个TAI是小区2的参数。
作为另一种实现方式，会话建立请求消息中携带的终端设备的位置信息包含终端设备当前接入的VMR的位置信息以及小区1的信息。例如，会话建立请求消息中携带VMR当前接入的第一接入网设备的小区2对应的TAI以及小区1对应的TAI。
步骤1010，SMF根据终端设备的位置信息选择用户面网元。例如，SMF根据VMR当前接入的第一接入网设备的小区对应的TAC选择用户面网元。再例如，SMF根据VMR当前接入的第一接入网设备的小区对应的TAC以及终端设备接入的VMR的小区对应的TAC选择用户面网元。
步骤1011，VMR发生移动，更换接入网设备，执行Xn切换。
示例性地，VMR的MT功能从第一接入网设备切换到第二接入网设备，然后，VMR 的DU功能跟第二接入网设备建立F1连接，由第二接入网设备激活VMR的小区。其中，VMR的MT功能从第一接入网设备切换到第二接入网设备，可以理解为，VMR的MT功能从第一接入网设备的小区接入到第二接入网设备的小区，即VMR当前接入的小区发生了改变，如，VMR当前接入的小区从第一接入网设备的小区2变成了第二接入网设备的小区4，其中，小区2对应的TAC和/或Cell ID跟小区4对应的TAC和/或Cell ID不同。
需要注意的是，移动中继接入的小区由第一接入网设备的第二小区切换至第二接入网设备的第四小区，该移动中继的小区信息可能不会发生改变，例如小区1对应的TAC依然保持不变。
步骤1012，在切换过程中，第一接入网设备向第二接入网设备传递上下文信息。
例如，第一接入网设备通过Xn接口将VMR的上下文信息传递给第二接入网设备，其中，VMR的上下文信息中包括位置上报信息(location reporting information)，该位置上报信息包含了如下一项或多项：VMR标识、VMR的位置信息的上报周期、VMR的位置信息类型(如TAI和/或Cell ID)以及AMF标识，其中，AMF标识指的是服务终端设备的AMF的标识。
步骤1013，第二接入网设备向AMF发送位置上报(location report)消息。
该位置上报消息中携带VMR当前接入的第二接入网设备的小区的信息，如TAC和/或Cell ID。
步骤1014，AMF向SMF发送终端设备移动通知。
由于AMF从第二接入网设备接收到了VMR的位置信息，该位置信息跟从第一接入网设备接收的位置信息不同。AMF认为终端设备发生了移动，因此向SMF发送终端设备移动通知(UE mobility notification)，例如，该通知中可以携带VMR当前接入的小区(如小区4)的TAC(该TAC与第二接入设备的小区对应)。可选地，该通知中还可以携带终端设备接入的VMR的小区(如小区1)的TAI。
可以理解，当上述通知中携带了VMR当前接入的小区(如小区4)的TAI和终端设备接入的VMR的小区(如小区1)的TAI时，为了帮助SMF区分VMR当前接入的小区对应的TAI以及终端设备接入的VMR的小区对应的TAI，上述通知中还可以携带指示信息，用于指示SMF哪个TAI是小区1的参数，哪个TAI是小区4的参数。
步骤1015，SMF确定是否进行锚点迁移。
示例性地，SMF根据终端设备当前的位置决定是否需要执行锚点迁移。例如，如果SMF判断终端设备在当前位置下，之前选择的锚点用户面到接入网设备的N3接口的用户面路径已经不优，则SMF可以选择进行锚点迁移，具体地，SMF可以为当前会话选择本地锚点，从而将数据直接路由到本地，优化用户面的路由路径，减少数据传输的时延。
图11是基于N2接口来切换的场景下的通信方法的一示例。图11所示的实施例与图10所示的实施例不同之处在于图11中的步骤1110至步骤1112，其他步骤与图10类似。如图11所示，图11所示的方法包括步骤1101至步骤1115，下面将对图11所示方法的各个步骤进行详细描述。应理解，图11中所示的方法中，移动中继以VMR为例，核心网设备以AMF为例进行描述，其中，AMF 1是服务终端设备的核心网设备，AMF 2是服务VMR的核心网设备。
步骤1101，第一接入网设备发送广播消息。
步骤1102，VMR从OAM获取VMR的小区的配置信息，执行小区的激活流程。
步骤1103，终端设备向第一接入网设备发送RRC建立请求消息。相应地，第一接入网设备接收来自终端设备的RRC建立请求消息。
步骤1104，第一接入网设备确定终端设备从VMR接入。
也即，第一接入网设备确定终端设备接入的小区(如小区1)是VMR的小区。
步骤1105，第一接入网设备向AMF 1发送N2消息，该N2消息中携带VMR的第一位置信息。
其中，第一接入网设备确定第一位置信息的方法可以是：第一接入网设备根据本地存储的上下文信息确定移动中继当前接入的小区是第二小区，进一步地，确定第二小区对应的TAC和/或Cell ID。
步骤1106，执行注册流程中的其他步骤，可以参考已知的终端设备的注册流程，此处不再赘述。
步骤1107，第一接入网设备向AMF 1发送位置上报(location report)消息。
VMR发生了移动，比如VMR的MT功能从第一接入网设备的第二小区接入到第一接入网设备的第三小区，即满足上报条件，第一接入网设备主动发起位置上报流程，向AMF1发送VMR当前的位置信息。
需要注意的是，移动中继接入的小区由第一接入网设备的第二小区切换至第一接入网设备的第三小区，该移动中继的小区信息可能不会发生改变，例如小区1对应的TAC依然保持不变。
步骤1108，终端设备发起会话建立流程。
步骤1109，AMF 1向SMF发送会话建立请求消息，该会话建立请求消息中携带终端设备的位置信息。
需要说明的是，步骤1101至步骤1109的具体的过程可以参看图10的描述，此处不再赘述。
步骤1110，VMR发生移动，更换接入网设备，执行N2切换。
示例性地，VMR的MT功能从第一接入网设备切换到第二接入网设备，然后，VMR的DU功能跟第二接入网设备建立F1连接，由第二接入网设备激活VMR的小区。其中，VMR的MT功能从第一接入网设备切换到第二接入网设备，可以理解为，VMR的MT功能从第一接入网设备的小区接入到第二接入网设备的小区，即VMR当前接入的小区发生了改变，如，VMR当前接入的小区从第一接入网设备的小区2变成了第二接入网设备的小区4，其中，小区2对应的TAC和/或Cell ID跟小区4对应的TAC和/或Cell ID不同。
步骤1111，在切换过程中，第一接入网设备向AMF 2发送切换请求消息，该切换请求消息中携带上下文信息。
例如，第一接入网设备向服务VMR的AMF 2发送切换请求(Handover Required)消息，其中，切换请求消息中包含第一接入网设备向第二接入网设备发送的上下文信息，该上下文信息可以用源到目标透明容器(source to target transparent container)来传输，上下文信息中还包含了位置上报信息(location reporting information)，如AMF 1的标识。
步骤1112，AMF 2向第二接入网设备发送切换请求消息，该切换请求消息中携带上下文信息。
步骤1113，第二接入网设备向AMF发送位置上报(location report)消息。
步骤1114，AMF向SMF发送终端设备移动通知。
步骤1115，SMF确定是否进行锚点迁移。
步骤1113和步骤1115的具体描述可以参看图10所示的实施例，此处不再详细描述。
基于上述技术方案，第一接入网设备在确定终端设备接入的小区是移动中继的小区后，主动向服务于终端设备的核心网设备上报移动中继当前的位置信息，以便于核心网设备基于移动中继的当前的位置信息确定终端设备的位置信息，其中，位置信息包括移动中继当前接入的第一接入网设备的小区对应的TAC和/或Cell ID。第一接入网设备主动上报移动中继的位置信息，使得核心网设备可以基于该移动中继的位置信息确定终端设备的位置信息，本申请提供了一种接入移动中继的终端设备在移动场景下，如何获取终端设备的位置信息的方法，解决了由于终端设备接入的移动中继的小区信息与终端设备当前的实际位置不匹配的问题，换言之，虽然移动中继的小区信息无法反映出终端设备的实际位置信息，核心网设备也可以准确地确定到终端设备的实际位置。
图12至图14为本申请实施例提供的可能的通信装置的结构示意图。
图12是本申请实施例提供的通信装置1200的示意性框图。
如图12所示，通信装置1200包括处理单元1210和收发单元1220。
上述装置1200可以用于实现上述方法实施例中核心网设备的功能，或者，上述装置1200可以包括用于实现上述方法实施例中核心网设备的任一功能或操作的模块，该模块可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。上述装置1200可以用于实现上述方法实施例中接入网设备(如第一接入网设备)的功能，或者，装置1200可以包括用于实现上述方法实施例中接入网设备的任一功能或操作的模块，该模块可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。
示例性地，当装置1200用于实现图6所示的方法实施例中核心网设备的功能时，处理单元1210用于确定终端设备接入的第一小区是移动中继的小区；收发单元1820可以用于向第一接入网设备发送第一消息，第一消息中携带第一信息，第一消息用于请求第一接入网设备上报移动中继的位置信息，第一信息用于第一接入网设备确定移动中继，移动中继用于在终端设备和第一接入网设备之间提供中继服务；收发单元1820还用于接收来自第一接入网设备的移动中继的第一位置信息，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，第二小区为第一接入网设备的小区；处理单元1210还用于基于移动中继的第一位置信息，确定终端设备的位置信息。
示例性地，当装置1200用于实现图6所示的方法实施例中接入网设备(如第一接入网设备)的功能时，收发单元1220可以用于接收来自核心网设备的第一消息，核心网设备服务于终端设备，第一消息中携带第一信息，第一消息用于请求第一接入网设备上报移动中继的位置信息，第一信息用于第一接入网设备确定移动中继，移动中继的位置信息用于核心网设备确定终端设备的位置信息，移动中继用于在终端设备和第一接入网设备之间提供中继服务；基于第一消息，向核心网设备发送移动中继的第一位置信息，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，第二小区为第一接入网设备的小区。
示例性地，当装置1200用于实现图9所示的方法实施例中接入网设备(如第一接入 网设备)的功能时，处理单元1210用于确定终端设备接入的第一小区是移动中继的小区；收发单元1220可以用于向服务于终端设备的核心网设备发送移动中继的第一位置信息，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，移动中继的第一位置信息用于核心网设备确定终端设备的位置信息，移动中继用于在终端设备和第一接入网设备之间提供中继服务，第二小区为第一接入网设备的小区。
示例性地，当装置1200用于实现图9所示的方法实施例中核心网设备的功能时，收发单元1220用于接收来自第一接入网设备的移动中继的第一位置信息，第一位置信息包括移动中继当前接入的第二小区对应的TAC和/或Cell ID，第二小区为第一接入网设备的小区，移动中继用于在终端设备和第一接入网设备之间提供中继服务，终端设备接入的第一小区为移动中继的小区；处理单元1210用于基于所述移动中继的第一位置信息，确定所述终端设备的位置信息
有关上述处理单元1210和收发单元1220更详细的描述可以直接参考上述方法实施例中相关描述直接得到，这里不加赘述。
应理解，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。另外，在本申请各个实施例中的各功能单元可以集成在一个处理器中，也可以是单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
图13是本申请实施例提供的通信装置1300的另一示意性框图。该装置1300可以为芯片系统，或者，也可以为配置了芯片系统，以用于实现上述方法实施例中通信功能的装置。在本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
如图13所示，该装置1300可以包括处理器1310和通信接口1320。其中，通信接口1320可用于通过传输介质和其它设备进行通信，从而用于装置1300可以和其它设备进行通信。所述通信接口1320例如可以是收发器、接口、总线、电路或者能够实现收发功能的装置。处理器1310可利用通信接口1320输入输出数据，并用于实现图6至图11对应的实施例中任一实施例所述的方法。具体地，该装置1300可用于实现上述方法实施例接入网设备或核心网设备的功能。
当装置1300用于实现图6至图11对应的实施例中任一实施例所述的方法时，处理器1310用于实现上述处理单元1210的功能，通信接口1320用于实现上述收发单元1220的功能。
可选地，该装置1300还包括至少一个存储器1330，用于存储程序指令和/或数据。存储器1330和处理器1310耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器1310可能和存储器1330协同操作。处理器1310可能执行存储器1330中存储的程序指令。所述至少一个存储器中的至少一个可以包括于处理器中。
本申请实施例中不限定上述处理器1310、通信接口1320以及存储器1330之间的具体连接介质。本申请实施例在图13中以处理器1310、通信接口1320以及存储器1330之间通过总线1340连接。总线1340在图13中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图13中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
图14是本申请实施例提供的接入网设备的结构示意图，例如可以为基站的结构示意图。该基站1400可执行上述方法实施例中接入网设备的功能。如图14所示，该基站1400可以包括一个或多个射频单元，如远端射频单元(remote radio unit，RRU)1410和一个或多个基带单元(BBU)(也可称为分布式单元(DU))1420。所述RRU 1410可以称为收发单元，与图12中的收发单元1220对应。可选地，该RRU 1410还可以称为收发机、收发电路、或者收发器等等，其可以包括至少一个天线1411和射频单元1412。可选地，RRU1410可以包括接收单元和发送单元，接收单元可以对应于接收器(或称接收机、接收电路)，发送单元可以对应于发射器(或称发射机、发射电路)。所述RRU 1410部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端设备发送配置信息。所述BBU 1420部分主要用于进行基带处理，对基站进行控制等。所述RRU 1410与BBU 1420可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 1420为基站的控制中心，也可以称为处理单元，可以与图12中的处理单元1210对应，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理单元)可以用于控制基站执行上述方法实施例中关于接入网设备的操作流程。
在一个示例中，所述BBU 1420可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU 1420还包括存储器1421和处理器1422。所述存储器1421用以存储必要的指令和数据。所述处理器1422用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于接入网设备的操作流程。所述存储器1421和处理器1422可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
应理解，图14所示的基站1400能够实现上述方法实施例中涉及接入网设备的各个过程。基站1400中的各个模块的操作和/或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详细描述。
本申请还提供一种计算机程序产品，所述计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当所述计算机程序被运行时，使得计算机执行图6至图11对应的实施例中任一实施例所述的方法。
本申请还提供一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序(也可以称为代码，或指令)。当所述计算机程序被运行时，使得计算机执行图6至图11对应的实施例中任一实施例所述的方法。
本申请实施例提供了一种通信系统，该系统包括如前所述的接入网设备和核心网设备。
应理解，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。 结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
还应理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本说明书中使用的术语“单元”、“模块”等，可用于表示计算机相关的实体、硬件、固件、硬件和软件的组合、软件、或执行中的软件。本申请实施例中的单元和模块含义相同，可以交叉使用。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各种说明性逻辑块(illustrative logical block)和步骤(step)，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。在本申请所提供的几个实施例中，应该理解到，所揭露的装置、设备和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
在上述实施例中，各功能单元的功能可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令(程序)。在计算机上加载和执行所述计 算机程序指令(程序)时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，数字通用光盘(digital video disc，DVD))、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (27)

  1. 一种通信方法，其特征在于，应用于核心网设备，所述核心网设备服务于终端设备，所述方法包括：
    确定所述终端设备接入的第一小区是移动中继的小区；
    向第一接入网设备发送第一消息，所述第一消息中携带第一信息，所述第一消息用于请求所述第一接入网设备上报所述移动中继的位置信息，所述第一信息用于所述第一接入网设备确定所述移动中继，所述移动中继用于在所述终端设备和所述第一接入网设备之间提供中继服务；
    接收来自所述第一接入网设备的所述移动中继的第一位置信息，所述第一位置信息包括所述移动中继当前接入的第二小区对应的跟踪区域码TAC和/或小区标识Cell ID，所述第二小区为所述第一接入网设备的小区；
    基于所述移动中继的第一位置信息，确定所述终端设备的位置信息。
  2. 如权利要求1所述的方法，其特征在于，所述第一信息包括以下一种或者多种：
    所述移动中继的标识；
    所述第一小区对应的TAC；和
    所述第一小区的Cell ID。
  3. 如权利要求1或2所述的方法，其特征在于，所述确定所述终端设备接入的第一小区是移动中继的小区，包括：
    从所述第一接入网设备接收所述第一小区的信息，所述第一小区的信息包括所述第一小区对应的TAC和/或Cell ID；
    基于预存的配置信息和所述第一小区的信息，确定所述第一小区是所述移动中继的小区，所述配置信息包括移动中继的小区信息，所述小区信息包括TAC和/或Cell ID，所述移动中继的小区信息包括所述第一小区的信息。
  4. 如权利要求1或2所述的方法，其特征在于，所述确定所述终端设备接入的第一小区是移动中继的小区，包括：
    从所述第一接入网设备或者所述终端设备接收第二信息，所述第二信息用于指示所述终端设备接入的小区是移动中继的小区。
  5. 如权利要求1至4中任一项所述的方法，其特征在于，所述第一消息中还携带如下一项或多项：所述移动中继的位置信息的上报周期、所述移动中继的位置信息类型、以及所述核心网设备的标识，所述移动中继的位置信息类型包括所述移动中继所接入的小区的TAC和/或Cell ID。
  6. 如权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    接收来自第二接入网设备的所述移动中继的第二位置信息，所述第二位置信息包括所述移动中继接入的第三小区对应的TAC和/或Cell ID，所述第三小区为所述第二接入网设备的小区；
    基于接收到的所述第二位置信息，确定所述终端设备的位置发生变化。
  7. 一种通信方法，其特征在于，应用于第一接入网设备，所述方法包括：
    接收来自核心网设备的第一消息，所述核心网设备服务于终端设备，所述第一消息中携带第一信息，所述第一消息用于请求所述第一接入网设备上报移动中继的位置信息，所 述第一信息用于所述第一接入网设备确定所述移动中继，所述移动中继的位置信息用于所述核心网设备确定所述终端设备的位置信息，所述移动中继用于在所述终端设备和所述第一接入网设备之间提供中继服务；
    基于所述第一消息，向所述核心网设备发送所述移动中继的第一位置信息，所述第一位置信息包括所述移动中继当前接入的第二小区对应的跟踪区域码TAC和/或小区标识Cell ID，所述第二小区为所述第一接入网设备的小区。
  8. 如权利要求7所述的方法，其特征在于，所述第一信息包括以下一种或者多种：
    所述移动中继的标识；
    第一小区对应的TAC，所述第一小区是所述终端设备接入的所述移动中继的小区；和
    所述第一小区的Cell ID。
  9. 如权利要求7或8所述的方法，其特征在于，所述第一消息中还携带如下一项或多项：所述移动中继的位置信息的上报周期、所述移动中继的位置信息类型、以及所述核心网设备的标识，所述移动中继的位置信息类型包括所述移动中继接入的小区的TAC和/或Cell ID。
  10. 如权利要求9所述的方法，其特征在于，所述方法还包括：
    向第二接入网设备发送所述移动中继的上下文信息，所述第二接入网设备是所述移动中继切换后的接入网设备，所述移动中继的上下文信息包括所述核心网设备的标识。
  11. 一种通信方法，其特征在于，应用于第一接入网设备，所述方法包括：
    确定终端设备接入的第一小区是移动中继的小区；
    向服务于所述终端设备的核心网设备发送所述移动中继的第一位置信息，所述第一位置信息包括所述移动中继当前接入的第二小区对应的跟踪区域码TAC和/或小区标识Cell ID，所述移动中继的第一位置信息用于所述核心网设备确定所述终端设备的位置信息，所述移动中继用于在所述终端设备和所述第一接入网设备之间提供中继服务，所述第二小区为所述第一接入网设备的小区。
  12. 如权利要求11所述的方法，其特征在于，所述确定终端设备接入的第一小区是移动中继的小区，包括：
    基于预存的配置信息和所述第一小区的信息，确定所述第一小区是所述移动中继的小区，所述第一小区的信息包括所述第一小区对应的TAC和/或Cell ID，所述配置信息包括移动中继的小区信息，所述小区信息包括TAC和/或Cell ID，所述移动中继的小区信息包括所述第一小区的信息。
  13. 如权利要求11所述的方法，其特征在于，所述确定终端设备接入的第一小区是移动中继的小区，包括：
    从所述移动中继或者所述终端设备接收第一指示信息，所述第一指示信息用于指示所述第一小区为具有移动性的小区，和/或，所述移动中继具有移动性。
  14. 如权利要求11至13中任一项所述的方法，其特征在于，所述方法还包括：
    确定所述移动中继的位置信息的上报周期和/或上报条件，其中，所述上报条件包括所述移动中继接入的小区由第二小区切换至第三小区，所述第二小区和所述第三小区是所述第一接入网设备的小区，所述第二小区与所述第三小区的TAC和/或Cell ID不同。
  15. 如权利要求14所述的方法，其特征在于，在所述移动中继接入的小区由所述第二 小区切换至所述第三小区的情况下，所述方法还包括：
    向所述核心网设备发送所述第三小区对应的TAC和/或Cell ID。
  16. 如权利要求11至15中任一项所述的方法，其特征在于，所述向服务于所述终端设备的核心网设备发送所述移动中继的第一位置信息，包括：
    向所述核心网设备发送N2消息，所述N2消息中包括所述第一位置信息。
  17. 如权利要求16所述的方法，其特征在于，所述N2消息中还包括以下一种或者多种：
    所述第一小区对应的TAC；
    所述第一小区的Cell ID；和
    所述终端设备的NAS消息。
  18. 如权利要求11至17中任一项所述的方法，其特征在于，所述方法还包括：
    向第二接入网设备发送所述移动中继的上下文信息，所述第二接入网设备是所述移动中继切换后的接入网设备，所述移动中继的上下文信息包括所述核心网设备的标识。
  19. 一种通信方法，其特征在于，应用于核心网设备，所述核心网设备服务于终端设备，所述方法包括：
    接收来自第一接入网设备的移动中继的第一位置信息，所述第一位置信息包括所述移动中继当前接入的第二小区对应的跟踪区域码TAC和/或小区标识Cell ID，所述第二小区为所述第一接入网设备的小区，所述移动中继用于在所述终端设备和所述第一接入网设备之间提供中继服务，所述终端设备接入的第一小区为所述移动中继的小区；
    基于所述移动中继的第一位置信息，确定所述终端设备的位置信息。
  20. 如权利要求19所述的方法，其特征在于，所述方法还包括：
    从所述第一接入网设备接收N2消息，所述N2消息包含所述移动中继的第一位置信息。
  21. 如权利要求20所述的方法，其特征在于，所述N2消息中还包括以下一种或者多种：
    所述第一小区对应的TAC；
    所述第一小区的Cell ID；和
    所述终端设备的NAS消息。
  22. 如权利要求19或21所述的方法，其特征在于，所述方法还包括：
    接收来自所述第一接入网设备的所述移动中继的第二位置信息，所述第二位置信息包括所述移动中继当前接入的第三小区对应的TAC和/或Cell ID，所述第三小区和所述第二小区是所述第一接入网设备的小区，所述第三小区与所述第二小区的TAC和/或Cell ID不同。
  23. 如权利要求19至22中任一项所述的方法，其特征在于，所述方法还包括：
    接收来自第二接入网设备的所述移动中继的第三位置信息，所述第三位置信息包括所述移动中继当前接入的第四小区对应的TAC和/或Cell ID，所述第四小区是所述第二接入网设备的小区。
  24. 一种通信装置，其特征在于，包括用于实现如权利要求1至6中任一项所述的方法的单元，或，包括用于实现如权利要求7至10中任一项所述的方法的单元，或，包括用于实现如权利要求11至18中任一项所述的方法的单元，或，包括用于实现如权利要求 19至23中任一项所述的方法的单元。
  25. 一种通信装置，其特征在于，包括处理器和存储器，所述处理器和所述存储器耦合，所述处理器用于控制所述装置实现如权利要求1至6中任一项所述的方法，或，实现如权利要求7至10中任一项所述的方法，或，实现如权利要求11至18中任一项所述的方法，或，实现如权利要求19至23中任一项所述的方法。
  26. 一种计算机可读存储介质，其特征在于，所述存储介质中存储有计算机程序或指令，当所述计算机程序或指令被计算机执行时，实现如权利要求1至6中任一项所述的方法，或，实现如权利要求7至10中任一项所述的方法，或，实现如权利要求11至18中任一项所述的方法，或，实现如权利要求19至23中任一项所述的方法。
  27. 一种计算机程序产品，其特征在于，所述计算机程序产品包括指令，当所述指令被计算机运行时，实现如权利要求1至6中任一项所述的方法，或，实现如权利要求7至10中任一项所述的方法，或，实现如权利要求11至18中任一项所述的方法，或，实现如权利要求19至23中任一项所述的方法。
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