Mobility management method, apparatus, and system

Abstract

A mobility management method, an apparatus, and a system, relating to the technical field of wireless communications. The method comprises: a mobile node acquiring first geographic location information, the first geographic location information indicating the current geographic location of the mobile node; on the basis of the first geographic location information and a first correspondence, the mobile node acquiring a cell identifier and / or a tracking area identifier corresponding to the first geographic location information; and broadcasting the cell identifier and / or the tracking area identifier corresponding to the first geographic location information.

Description

Mobility management method, device and system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on February 8, 2024, with application number 202410177939.9 and invention name "A mobility management method, device and system", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of wireless communication technologies, and in particular to a mobility management method, device, and system. Background Art

[0004] Currently, mobile gNBs with wireless access backhaul (MWAB) are being proposed for vehicular scenarios. MWAB equipment can be deployed on a moving vehicle and consists of a base station (MWAB-gNB) and a terminal (MWAB-UE).

[0005] Because vehicles move, MWAB-gNB and MWAB-UE also have mobility. Among them, MWAB-UE has the functions of ordinary terminal equipment and can access the core network through new radio (NR). Usually, the next generation access protocol (NGAP) backhaul link between the fixed wireless access network equipment on the ground and the core network can be implemented through optical fiber. The NGAP backhaul link between the mobile MWAB-gNB and the core network can be implemented by the protocol data unit (PDU) session between the MWAB-UE and the core network, so that the MWAB-gNB can provide wireless access services to other terminal devices near the vehicle.

[0006] How to perform mobility management for MWAB devices, for example, how to update the cell identifier or tracking area identifier corresponding to the MWAB device, is a problem that needs to be solved at present. Summary of the Invention

[0007] Embodiments of the present application provide a mobility management method, apparatus, and system for implementing mobility management for a mobile node having a network access service function and mobility.

[0008] The embodiments of the present application can be applied to a mobile node having terminal functions and base station functions, wherein the mobile node includes a mobile node-terminal and a mobile node-base station. The mobile node-terminal has the functions of an ordinary terminal device and can access the core network through a wireless access network device. The mobile node-base station can provide network access services for ordinary terminal devices, and the connection between the ordinary terminal device and the core network (such as an N2 connection or an N3 connection) can be achieved through a session between the mobile node-terminal and the core network. Examples of mobile nodes can be vehicle mounted relays (VMRs), wireless access and backhauling (WABs), or mobile wireless access and backhauling (MWABs).

[0009] In a first aspect, a mobility management method is provided, which is applied to a mobile node, wherein the mobile node is used to provide wireless access services for a terminal device, the method comprising: obtaining first geographic location information, wherein the first geographic location information indicates the current geographic location of the mobile node; obtaining a cell identifier and / or tracking area identifier corresponding to the first geographic location information based on the first geographic location information and a first correspondence; wherein the first correspondence includes a correspondence between the cell identifier and the geographic location information and / or a correspondence between the tracking area identifier and the geographic location information; and broadcasting the cell identifier and / or tracking area identifier corresponding to the first geographic location information.

[0010] In the above implementation method, the mobile node can obtain the cell identifier and / or tracking area identifier corresponding to the first geographical location information based on the current first geographical location information and the first corresponding relationship, and broadcast the cell identifier and / or tracking area identifier, so that the information broadcast by the mobile node can be updated in time according to the current location of the mobile node. Then, based on the updated broadcast information, the terminal device (such as the above-mentioned first terminal device) that accesses the network through the mobile node can perform tracking area update (TAU), location report (location report), AMF reallocation (AMF reallocation) and other processes, thereby realizing mobility management.

[0011] In one possible implementation, the broadcasting of the cell identifier and / or tracking area identifier corresponding to the first geographic location information includes: if the cell identifier corresponding to the first geographic location information is different from the cell identifier broadcast by the mobile node, updating the cell identifier broadcast by the mobile node according to the cell identifier corresponding to the first geographic location information; and / or, if the tracking area identifier corresponding to the first geographic location information is different from the tracking area identifier broadcast by the mobile node, updating the tracking area identifier broadcast by the mobile node according to the tracking area identifier corresponding to the first geographic location information.

[0012] A possible implementation method also includes: sending a first message to a first access and mobility management function (AMF), wherein the first message includes a cell identifier and / or tracking area identifier corresponding to the first geographic location information, and the first message is used to request an update of the configuration information of the mobile node, and the first AMF is used to provide services for terminal devices accessing the mobile node.

[0013] Through the above implementation, the AMF that provides services for terminal devices accessing the mobile node can timely update the configuration information of the mobile node on the AMF to ensure data transmission.

[0014] In one possible implementation, the first correspondence also includes a correspondence between an AMF identifier and geographic location information, and the method further includes: obtaining an AMF identifier corresponding to the first geographic location information according to the first geographic location information and the first correspondence; if the AMF identifier indicates a second AMF, a first connection is established between the mobile node and the first AMF, and the second AMF is different from the first AMF, then sending a connection establishment request message to the second AMF, where the connection establishment request message is used to request establishment of a connection between the mobile node and the second AMF; wherein the first AMF is used to provide services for a terminal device accessing the mobile node.

[0015] In the above implementation method, the mobile node can obtain the AMF identifier corresponding to the first geographic location information based on the current first geographic location information and the first corresponding relationship, and establish a connection between the mobile node and the AMF based on the AMF identifier, so that the connection between the mobile node and the core network can be updated in time according to the current location of the mobile node to ensure that transmission services are provided for terminal devices accessing the mobile node (such as the above-mentioned first terminal device), so that the terminal devices accessing the network through the mobile node (such as the above-mentioned first terminal device) perform AMF reallocation (AMF reallocation) and other processes, thereby realizing mobility management.

[0016] In a possible implementation manner, it also includes: sending a connection release request message to the first AMF, where the connection release request message is used to request to release the connection between the mobile node and the first AMF.

[0017] In a possible implementation, it also includes: obtaining the first correspondence from a first network element, where the first network element is used to store the first correspondence; or, obtaining the first correspondence from a third AMF, where the third AMF is the AMF serving the mobile node.

[0018] In one possible implementation, after obtaining the first correspondence from the first network element, it also includes: sending the first correspondence to the third AMF.

[0019] In a possible implementation method, it also includes: receiving address information of the first network element, the address information of the first network element comes from the second network element in the network where the mobile node is registered; obtaining the first corresponding relationship from the first network element includes: obtaining the first corresponding relationship from the first network element according to the address information of the first network element.

[0020] In one possible implementation, obtaining the first geographic location information includes: receiving notification information from a third AMF, the notification information instructing the mobile node to update the broadcast cell identifier and / or tracking area identifier, and the third AMF is the AMF serving the mobile node; obtaining the first geographic location information according to the notification information.

[0021] In the above implementation, the notification information sent by the third AMF is used to trigger the mobile node to obtain the first geographical location information of its current location, and then update the broadcast cell identifier and / or tracking area identifier, which can reduce the positioning overhead of the mobile node and reduce power consumption.

[0022] In a possible implementation, the acquiring the first geographical location information includes: acquiring the first geographical location information according to a positioning process of the mobile node initiated periodically.

[0023] In one possible scenario, the AMF (first AMF) that provides services for the terminal device accessing the mobile node and the AMF (third AMF) that serves the mobile node are located in the same public land mobile network (PLMN).

[0024] In another possible scenario, the AMF (first AMF) that provides services for the terminal device accessing the mobile node and the AMF (third AMF) that serves the mobile node are located in different PLMNs.

[0025] In a second aspect, a mobility management method is provided, which includes: a third AMF obtains second geographic location information, where the second geographic location information is the geographic location information corresponding to the cell where the mobile node resides, the third AMF is the AMF serving the mobile node, and the mobile node is used to provide wireless access services for the terminal device; the third AMF determines the cell identifier and / or tracking area identifier corresponding to the second geographic location information based on the second geographic location information and a first correspondence, where the first correspondence includes a correspondence between the cell identifier and the geographic location information and / or a correspondence between the tracking area identifier and the geographic location information; if the cell identifier corresponding to the second geographic location information is different from the cell identifier broadcast by the mobile node, the mobile node is instructed to update the broadcast cell identifier, or if the tracking area identifier corresponding to the second geographic location information is different from the tracking area identifier broadcast by the mobile node, the mobile node is instructed to update the broadcast tracking area identifier.

[0026] In the above implementation, the third AMF can trigger the mobile node to update the broadcast cell identifier and / or tracking area identifier, thereby implementing mobility management. In addition, by triggering the mobile node to obtain the current first geographic location information and then update the broadcast cell identifier and / or tracking area identifier through the notification information sent by the third AMF, the positioning overhead of the mobile node can be reduced and power consumption can be reduced.

[0027] In one possible implementation, the first correspondence also includes a correspondence between an AMF identifier and geographic location information, and the method further includes: the third AMF determines the AMF identifier corresponding to the second geographic location information based on the second geographic location information and the first correspondence; if the AMF identifier corresponding to the second geographic location information is different from the identifier of the first AMF, the third AMF instructs the mobile node to update the AMF, and the first AMF is used to provide services for the terminal device accessing the mobile node.

[0028] In one possible implementation, the third AMF obtains the second geographic location information, including: the third AMF obtains the identifier of the cell where the mobile node resides from the first wireless access network device, and the first wireless access network device is a wireless access network device serving the mobile node: the third AMF determines the geographic location information corresponding to the identifier of the cell where the mobile node resides.

[0029] In a possible implementation manner, the method further includes: the third AMF obtaining the first corresponding relationship from the mobile node.

[0030] In a possible implementation, the third AMF sends the first correspondence to the mobile node; or the third AMF sends the address information of the first network element to the mobile node, and the first network element is used to store the first correspondence.

[0031] In one possible scenario, the AMF (first AMF) that provides services for the terminal device accessing the mobile node and the AMF (third AMF) that serves the mobile node are located in the same public land mobile network (PLMN).

[0032] In another possible scenario, the AMF (first AMF) that provides services for the terminal device accessing the mobile node and the AMF (third AMF) that serves the mobile node are located in different PLMNs.

[0033] According to a third aspect, a mobility management method is provided, which is applied to a mobile node, and the mobile node is used to provide wireless access services for terminal devices. The method includes: obtaining first geographic location information, where the first geographic location information indicates the current geographic location of the mobile node; obtaining an AMF identifier corresponding to the first geographic location information based on the first geographic location information and a first correspondence; wherein the first correspondence includes a correspondence between the AMF identifier and the geographic location information; if the AMF identifier indicates a second AMF, a first connection is established between the mobile node and the first AMF, and the second AMF is different from the first AMF, a connection establishment request message is sent to the second AMF, and the connection establishment request message is used to request establishment of a connection between the mobile node and the second AMF; wherein the first AMF is used to provide services for terminal devices accessing the mobile node.

[0034] In the above implementation method, the mobile node can query the first corresponding relationship based on the current geographical location information, obtain the corresponding AMF identifier, and establish a connection between the mobile node-base station and the AMF based on the AMF identifier, so that the connection between the mobile node and the core network can be updated in time according to the current location of the mobile node to ensure that transmission services are provided for terminal devices accessing the mobile node (such as the above-mentioned first terminal device), so that the terminal devices accessing the network through the mobile node (such as the above-mentioned first terminal device) perform AMF reallocation (AMF reallocation) and other processes, thereby realizing mobility management.

[0035] In a possible implementation manner, it also includes: sending a connection release request message to the first AMF, where the connection release request message is used to request to release the connection between the mobile node and the first AMF.

[0036] In a possible implementation, it also includes: obtaining the first correspondence from a first network element, where the first network element is used to store the first correspondence; or, obtaining the first correspondence from a third AMF, where the third AMF is the AMF serving the mobile node.

[0037] In one possible implementation, after obtaining the first correspondence from the first network element, it also includes: sending the first correspondence to the third AMF.

[0038] In a possible implementation method, it also includes: receiving address information of the first network element, the address information of the first network element comes from the second network element in the network where the mobile node is registered; obtaining the first corresponding relationship from the first network element includes: obtaining the first corresponding relationship from the first network element according to the address information of the first network element.

[0039] In one possible implementation, obtaining the first geographic location information includes: receiving notification information from a third AMF, the notification information instructing the mobile node to update the AMF, and the third AMF is the AMF serving the mobile node; obtaining the first geographic location information according to the notification information.

[0040] In a possible implementation, the acquiring the first geographical location information includes: acquiring the first geographical location information according to a positioning process of the mobile node initiated periodically.

[0041] In a fourth aspect, a mobility management method is provided, including: a third AMF obtains second geographic location information, where the second geographic location information is the geographic location information corresponding to the cell where the mobile node resides, the third AMF is the AMF serving the mobile node, and the mobile node is used to provide wireless access services for the terminal device; the third AMF determines the AMF identifier corresponding to the second geographic location information based on the second geographic location information and the first correspondence, where the first correspondence includes the correspondence between the AMF identifier and the geographic location information; if the AMF identifier corresponding to the second geographic location information is different from the identifier of the first AMF, the third AMF instructs the mobile node to update the AMF, and the first AMF is used to provide services for the terminal device accessing the mobile node.

[0042] In the above implementation, the third AMF can trigger the mobile node to update the connected AMF, thereby implementing mobility management. In addition, by triggering the mobile node to obtain the first geographical location information and then update the broadcast cell identifier and / or tracking area identifier through the notification information sent by the third AMF, the positioning overhead of the mobile node can be reduced and power consumption can be reduced.

[0043] In one possible implementation, the third AMF obtains the second geographic location information, including: the third AMF obtains the identifier of the cell where the mobile node resides from the first wireless access network device, where the first wireless access network device is a wireless access network device serving the mobile node; the third AMF determines the geographic location information corresponding to the identifier of the cell where the mobile node resides.

[0044] In a possible implementation manner, the method further includes: the third AMF obtaining the first corresponding relationship from the mobile node.

[0045] In a possible implementation, the third AMF sends the first correspondence to the mobile node; or the third AMF sends the address information of the first network element to the mobile node, and the first network element is used to store the first correspondence.

[0046] In a fifth aspect, a communication system is provided, comprising a mobile node and an AMF, wherein the mobile node is used to implement the method as described in any one of the first aspects, and the AMF is used to implement the method as described in any one of the second aspects; or, the mobile node is used to implement the method as described in any one of the third aspects, and the AMF is used to implement the method as described in any one of the fourth aspects.

[0047] In a sixth aspect, a communication device is provided, comprising a unit or module for executing the method as described in any one of the first aspects. Specifically, the communication device comprises a processing unit and a transceiver unit. The processing unit is used to obtain first geographic location information, where the first geographic location information indicates the current geographic location of the mobile node; based on the first geographic location information and a first correspondence, obtain a cell identifier and / or tracking area identifier corresponding to the first geographic location information; wherein the first correspondence includes a correspondence between the cell identifier and the geographic location information and / or a correspondence between the tracking area identifier and the geographic location information; and broadcast the cell identifier and / or tracking area identifier corresponding to the first geographic location information through the transceiver unit.

[0048] In one possible implementation, the processing unit is specifically configured to: if the cell identifier corresponding to the first geographic location information is different from the cell identifier broadcast by the mobile node, update the broadcast cell identifier through the transceiver unit according to the cell identifier corresponding to the first geographic location information; and / or,

[0049] If the tracking area identifier corresponding to the first geographic location information is different from the tracking area identifier broadcast by the mobile node, the broadcast tracking area identifier is updated by the transceiver unit according to the tracking area identifier corresponding to the first geographic location information.

[0050] In one possible implementation, the processing unit is also used to: send a first message to the first AMF through the transceiver unit, the first message including the cell identifier and / or tracking area identifier corresponding to the first geographic location information, the first message is used to request to update the configuration information of the mobile node, and the first AMF is used to provide services for the terminal device accessing the mobile node.

[0051] In one possible implementation, the first correspondence also includes a correspondence between an AMF identifier and geographic location information, and the processing unit is further used to: obtain the AMF identifier corresponding to the first geographic location information based on the first geographic location information and the first correspondence; if the AMF identifier indicates a second AMF, a first connection is established between the mobile node and the first AMF, and the second AMF is different from the first AMF, then a connection establishment request message is sent to the second AMF through the transceiver unit, and the connection establishment request message is used to request establishment of a connection between the mobile node and the second AMF; wherein the first AMF is used to provide services for terminal devices accessing the mobile node.

[0052] In one possible implementation, the processing unit is further used to: send a connection release request message to the first AMF through the transceiver unit, where the connection release request message is used to request the release of the connection between the mobile node and the first AMF.

[0053] In one possible implementation, the processing unit is also used to: obtain the first correspondence from the first network element through the transceiver unit, and the first network element is used to store the first correspondence; or, obtain the first correspondence from the third AMF through the transceiver unit, and the third AMF is the AMF serving the mobile node.

[0054] In one possible implementation, the processing unit is further used to: after obtaining the first corresponding relationship from the first network element, send the first corresponding relationship to the third AMF through the transceiver unit.

[0055] In one possible implementation, the transceiver unit is also used to receive address information of the first network element, and the address information of the first network element comes from the second network element in the network where the mobile node is registered; the processing unit is specifically used to obtain the first corresponding relationship from the first network element based on the address information of the first network element.

[0056] In one possible implementation, the transceiver unit is specifically used to: receive notification information from a third AMF, the notification information instructing the mobile node to update the broadcast cell identifier and / or tracking area identifier, and the third AMF is the AMF serving the mobile node; the processing unit is specifically used to: obtain the first geographic location information according to the notification information.

[0057] In a possible implementation manner, the processing unit is specifically configured to: obtain the first geographical location information according to a positioning process for the mobile node initiated periodically.

[0058] In a seventh aspect, a communication device is provided, comprising a unit or module for executing the method as described in any one of the second aspects. Specifically, the communication device comprises a processing unit and a transceiver unit. The processing unit is used to obtain second geographic location information, where the second geographic location information is geographic location information corresponding to the cell where the mobile node resides, the third AMF is the AMF serving the mobile node, and the mobile node is used to provide wireless access services for the terminal device; based on the second geographic location information and the first correspondence, the cell identifier and / or tracking area identifier corresponding to the second geographic location information is determined, where the first correspondence includes a correspondence between the cell identifier and the geographic location information and / or a correspondence between the tracking area identifier and the geographic location information; if the cell identifier corresponding to the second geographic location information is different from the cell identifier broadcast by the mobile node, the transceiver unit is used to instruct the mobile node to update the broadcast cell identifier, or if the tracking area identifier corresponding to the second geographic location information is different from the tracking area identifier broadcast by the mobile node, the transceiver unit is used to instruct the mobile node to update the broadcast tracking area identifier.

[0059] In one possible implementation, the first correspondence also includes a correspondence between an AMF identifier and geographic location information, and the processing unit is further used to: determine the AMF identifier corresponding to the second geographic location information based on the second geographic location information and the first correspondence; if the AMF identifier corresponding to the second geographic location information is different from the identifier of the first AMF, the transceiver unit instructs the mobile node to update the AMF, and the first AMF is used to provide services for the terminal device accessing the mobile node.

[0060] In one possible implementation, the processing unit is specifically used to: obtain the identifier of the cell where the mobile node resides from the first wireless access network device through the transceiver unit, where the first wireless access network device is a wireless access network device serving the mobile node; and determine the geographic location information corresponding to the identifier of the cell where the mobile node resides.

[0061] In a possible implementation manner, the processing unit is further configured to: obtain the first corresponding relationship from the mobile node through the transceiver unit.

[0062] In one possible implementation, the processing unit is further used to: send the first correspondence to the mobile node through the transceiver unit; or send the address information of the first network element to the mobile node through the transceiver unit, and the first network element is used to store the first correspondence.

[0063] In an eighth aspect, a communication device is provided, comprising a unit or module for executing the method as described in any one of the third aspects. Specifically, the communication device comprises a processing unit and a transceiver unit. Applied to a mobile node, the mobile node is used to provide wireless access services for terminal devices. The processing unit is used to obtain first geographic location information, which indicates the current geographic location of the mobile node; based on the first geographic location information and the first correspondence, obtain the access and mobility management AMF identifier corresponding to the first geographic location information; wherein the first correspondence includes the correspondence between the AMF identifier and the geographic location information; if the AMF identifier indicates a second AMF, a first connection is established between the mobile node and the first AMF, and the second AMF is different from the first AMF, then a connection establishment request message is sent to the second AMF through the transceiver unit, and the connection establishment request message is used to request the establishment of a connection between the mobile node and the second AMF; wherein the first AMF is used to provide services for terminal devices accessing the mobile node.

[0064] In one possible implementation, the processing unit is further used to: send a connection release request message to the first AMF through the transceiver unit, where the connection release request message is used to request the release of the connection between the mobile node and the first AMF.

[0065] In one possible implementation, the processing unit is also used to: obtain the first correspondence from the first network element through the transceiver unit, and the first network element is used to store the first correspondence; or, obtain the first correspondence from the third AMF through the transceiver unit, and the third AMF is the AMF serving the mobile node.

[0066] In one possible implementation, the processing unit is further used to: after obtaining the first corresponding relationship from the first network element, send the first corresponding relationship to the third AMF through the transceiver unit.

[0067] In one possible implementation, the transceiver unit is also used to: receive address information of the first network element, where the address information of the first network element comes from a second network element in the network where the mobile node is registered; and the processing unit is specifically used to: obtain the first corresponding relationship from the first network element through the transceiver unit based on the address information of the first network element.

[0068] In one possible implementation, the transceiver unit is specifically used to: receive notification information from a third AMF, the notification information instructing the mobile node to update the AMF, and the third AMF is the AMF serving the mobile node; the processing unit is specifically used to: obtain the first geographic location information according to the notification information.

[0069] In a possible implementation manner, the processing unit is specifically configured to: obtain the first geographical location information according to a positioning process for the mobile node initiated periodically.

[0070] In the ninth aspect, a communication device is provided, comprising a unit or module for executing the method as described in any one of the third aspects. Specifically, the communication device comprises a processing unit and a transceiver unit. The processing unit is used to obtain second geographic location information, where the second geographic location information is the geographic location information corresponding to the cell where the mobile node resides, the third AMF is the AMF serving the mobile node, and the mobile node is used to provide wireless access services for the terminal device; based on the second geographic location information and the first correspondence, the AMF identifier corresponding to the second geographic location information is determined, where the first correspondence includes the correspondence between the access and mobility management function AMF identifier and the geographic location information; if the AMF identifier corresponding to the second geographic location information is different from the identifier of the first AMF, the mobile node is instructed to update the AMF through the transceiver unit, and the first AMF is used to provide services for the terminal device accessing the mobile node.

[0071] In one possible implementation, the processing unit is specifically used to: obtain the identifier of the cell where the mobile node resides from the first wireless access network device through the transceiver unit, where the first wireless access network device is a wireless access network device serving the mobile node; and determine the geographic location information corresponding to the identifier of the cell where the mobile node resides.

[0072] In a possible implementation manner, the processing unit is further configured to: obtain the first corresponding relationship from the mobile node through the transceiver unit.

[0073] In one possible implementation, the processing unit is further used to: send the first correspondence to the mobile node through the transceiver unit; or send the address information of the first network element to the mobile node through the transceiver unit, and the first network element is used to store the first correspondence.

[0074] In the tenth aspect, a communication device is provided, comprising: one or more processors configured to execute a method as described in any one of the first aspects, or to execute a method as described in any one of the second aspects, or to execute a method as described in any one of the third aspects, or to execute a method as described in any one of the fourth aspects.

[0075] In the eleventh aspect, a readable storage medium is provided, in which a program is stored. When the program is executed by a communication device, the method as described in any one of the first aspect is implemented, or the method as described in any one of the second aspect is implemented, or the method as described in any one of the third aspect is implemented, or the method as described in any one of the fourth aspect is implemented.

[0076] In the twelfth aspect, a chip system is provided, comprising: a memory for storing a computer program; a processor; when the processor calls and runs the computer program from the memory, the communication device equipped with the chip system executes the method as described in any one of the first aspect, or executes the method as described in any one of the second aspect, or executes the method as described in any one of the third aspect, or executes the method as described in any one of the fourth aspect.

[0077] In the thirteenth aspect, a computer program product is provided, which includes instructions. When the instructions are executed on a processor, the processor executes the method as described in any one of the first aspect, or the method as described in any one of the second aspect, or the method as described in any one of the third aspect, or the method as described in any one of the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] FIG1 is a schematic diagram of a 5G network architecture based on a service-oriented interface applicable to an embodiment of the present application;

[0079] FIG2 is a schematic diagram of a 5G network architecture based on a point-to-point interface applicable to an embodiment of the present application;

[0080] FIG3 is a schematic diagram of the basic architecture of the MWAB device in an embodiment of the present application;

[0081] FIG4 is a schematic diagram illustrating that the PLMN to which the MWAB-UE is registered and the PLMN to which the UE accessed via the MWAB-gNB is registered are different PLMNs in an embodiment of the present application;

[0082] FIG5 is a schematic diagram of a mobile IAB architecture;

[0083] Figure 6 is a schematic diagram of a tracking area;

[0084] FIG7 is a flow chart of a mobility management method provided in an embodiment of the present application;

[0085] FIG8 is a flow chart of another mobility management method provided in an embodiment of the present application;

[0086] FIG9 is a flow chart of another mobility management method provided in an embodiment of the present application;

[0087] FIG10 is a flow chart of another mobility management method provided in an embodiment of the present application;

[0088] FIG11 is a flow chart of another mobility management method provided in an embodiment of the present application;

[0089] FIG12 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0090] FIG13 is a schematic structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0091] The 3rd Generation Partnership Project (3GPP) standards group has developed the Next Generation System architecture for mobile communications networks, known as the 5G network architecture. This architecture supports the use of 3GPP-defined radio access technologies (such as Long Term Evolution (LTE) and 5G Radio Access Network (RAN)) to connect to the 5G core network (CN). It also supports the use of non-3GPP access technologies to connect to the core network through the non-3GPP interworking function (N3IWF) or the next generation packet data gateway (ngPDG).

[0092] Figure 1 is a schematic diagram of a 5G network architecture based on a service-oriented architecture. The 5G network architecture shown in Figure 1 includes access network equipment and core network equipment. Terminal devices access the data network (DN) through the access network equipment and core network equipment. Among them, the core network equipment includes but is not limited to some or all of the following network elements: authentication server function (AUSF) network element, unified data management (UDM) network element, unified data repository (UDR) network element (not shown in the figure), network storage function (NRF) network element, network exposure function (NEF) network element, network slice selection function (NSSF) network element, network slice selection authentication and authorization function (NSSAAF) network element, network slice admission control function (NSACF) network element, application function (AF) network element, policy control function (PCF) network element, AMF network element, session management function (SMF) network element, user plane function (UPF) network element, binding support function (BSF) network element (not shown in the figure).

[0093] Terminal devices can be user equipment (UE), mobile stations, mobile terminal devices, etc. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart cities, etc. Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, wearable devices, vehicles, urban air vehicles (such as drones and helicopters), ships, robots, robotic arms, smart home devices, etc.

[0094] The access network device is a device with wireless transceiver functions, which is used to communicate with the terminal device. The access network device includes but is not limited to base stations (base transceiver station (BTS), Node B, eNodeB / eNB, or gNodeB / gNB), transmission reception points (TRP), base stations of subsequent evolution of 3GPP, access nodes in Wi-Fi systems, wireless relay nodes, wireless backhaul nodes, etc. The base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, etc. Multiple base stations can support networks with the same access technology or networks with different access technologies. The base station can include one or more co-station or non-co-station transmission and receiving points. The access network device can also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The access network device can also be a server, etc.

[0095] Access network equipment and terminal devices can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; on water; or in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of access network equipment and terminal devices.

[0096] The AMF network element is responsible for UE mobility management, including mobile state management, allocating temporary identities to UEs, and authenticating and authorizing UEs.

[0097] The SMF network element is responsible for the selection and reselection of UPF network elements, IP address allocation, bearer establishment, modification and release, and quality of service (QoS) control.

[0098] The UPF network element supports 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 before forwarding to the data network); and packet inspection.

[0099] The UDM network element is responsible for managing contract data and notifying the corresponding network element when the contract data is modified.

[0100] In Figure 1, Nnssf, Nnef, Nnrf, Npcf, Nudm, Naf, Nnssaaf, Nausf, Namf, Nsmf, and Nnsacf are service-oriented interfaces provided by the NSSF, NEF, NRF, PCF, UDM, AF, NSSAAF, AUSF, AMF, SMF, and NSACF, respectively, and are used to invoke corresponding service-oriented operations. N1, N2, N3, N4, N6, and N9 are interface serial numbers, and their meanings are as follows:

[0101] N1: The interface between AMF and terminal devices, which can be used to deliver non-access stratum (NAS) signaling (such as QoS rules from AMF) to terminal devices.

[0102] N2: The interface between AMF and access network equipment, which can be used to transmit radio bearer control information from the core network side to the access network equipment.

[0103] N3: The interface between the access network equipment and UPF, mainly used to transmit uplink and downlink user plane data between the access network equipment and UPF.

[0104] N4: The interface between SMF and UPF can be used to transmit information between the control plane and the user plane, including controlling the issuance of forwarding rules, QoS rules, traffic statistics rules, etc. for the user plane and reporting information to the user plane.

[0105] N6: Interface between UPF and DN, used to transmit uplink and downlink user data flows between UPF and DN.

[0106] N9: User plane interface between UPF network elements, used to transmit uplink and downlink user data flows between UPF network elements.

[0107] Figure 2 is a schematic diagram of a 5G network architecture based on point-to-point interfaces. The functions of the network elements in Figure 2 can be referred to as those of the corresponding network elements in Figure 1 and will not be repeated here. The main difference between Figure 2 and Figure 1 is that the interfaces between the control plane network elements in Figure 1 are service-oriented interfaces, while the interfaces between the control plane network elements in Figure 2 are point-to-point interfaces.

[0108] It is understood that the above-mentioned network element or function can be a network element in a hardware device, a software function running on dedicated hardware, or a virtualized function instantiated on a platform (e.g., a cloud platform). Optionally, the above-mentioned network element or function can be implemented by a single device, or by multiple devices, or can be a functional module within a single device, and this is not specifically limited in the embodiments of the present application.

[0109] The mobility management network element, session management network element, data management network element, and network storage function network element in this application can be the AMF network element, SMF network element, UDM network element, and NRF network element in the 5G system, respectively, or can be a network element in the future communication network that has the functions of the above-mentioned AMF network element, SMF network element, UDM network element, and NRF network element. This application is not limited to this. In the embodiments of this application, an example is described in which the AMF network element, SMF network element, UDM network element, and NRF network element are the mobility management network element, session management network element, data management network element, and network storage function network element, respectively. In addition, the AMF network element, SMF network element, UDM network element, and NRF network element are referred to as AMF, SMF, UDM, and NRF, respectively.

[0110] For ease of explanation, the embodiments of the present application are described using a base station and a UE as specific examples of an access network device and a terminal device, respectively. Any base station and UE appearing in any subsequent location can be replaced by an access network device and a terminal device, respectively.

[0111] Vehicle-mounted relay (VMR) devices are currently being proposed for in-vehicle scenarios. VMR devices are typically deployed on moving vehicles. A VMR device consists of a base station and a user equipment (UE). The UE can be referred to as a VMR-UE, and the base station can be referred to as a VMR-gNB. Because vehicles move, the VMR-gNB and VMR-UE also exhibit mobility. The VMR-UE functions as a standard terminal device and can access the core network via NR. Typically, the N2 backhaul link between a fixed ground base station and the core network can be implemented using optical fiber. The N2 backhaul link between the mobile VMR-gNB and the core network can be carried over the PDU session between the VMR-UE and the core network to achieve wireless backhaul. This allows the VMR-gNB to provide wireless access to other terminal devices near the vehicle. The VMR device can also be referred to as a wireless access and backhaul (WAB) device. The UEs that comprise the WAB can be referred to as WAB-UEs, and the base stations that comprise the WAB can be referred to as WAB-gNBs. Alternatively, the VMR device can also be called a mobile wireless access and backhauling (MWAB) device, the UE that constitutes the MWAB can be called a MWAB-UE, and the base station that constitutes the MWAB can be called a MWAB-gNB.

[0112] Taking a MWAB device as an example, Figure 3 shows a basic architecture diagram of a MWAB device. A MWAB-UE accesses the core network through a base station (e.g., a donor-gNB) located outside the vehicle. A PDU session is established between the MWAB-UE and the UPF (UPF#1 in the figure). The donor-gNB is also called a macro base station. N2 messaging between the MWAB-gNB and the AMF (AMF#2 in the figure) is implemented through a PDU session between the MWAB-UE and the UPF. For example, when the MWAB-gNB needs to send an N2 message to AMF#2, the MWAB-gNB forwards the N2 message to the MWAB-UE via the internal interface between the MWAB-gNB and the MWAB-UE. The MWAB-UE then transmits the N2 message as the payload of a data packet to the anchor UPF (UPF#1 in the figure) via the established PDU session. The anchor UPF then forwards the data packet to AMF#2, completing the N2 message forwarding. The N3 message transmission between the MWAB-gNB and the UPF (such as UPF#2 in the figure) can also be implemented through the PDU session between the MWAB-UE and the UPF. For example, when the MWAB-gNB needs to send an N3 message to UPF#2, the MWAB-gNB forwards the N3 message to the MWAB-UE through the internal interface between the MWAB-UE and the MWAB-UE. The MWAB-UE uses the N3 message as the payload of the data packet and passes it to the anchor UPF of the PDU session (which can be UPF#1 in the figure or other UPF, not limited in this application) through the established PDU session. The anchor UPF then forwards the data packet to UPF#2, thereby completing the forwarding of the N3 message.

[0113] Based on the architecture of the MWAB device shown in Figure 3, the public land mobile network (PLMN) registered by the MWAB-UE and the PLMN registered by the normal UE can be different PLMNs. As shown in Figure 4, the MWAB-UE registers as a UE to the core network of PLMN#1 and establishes a PDU session. Through the PDU session of the MWAB-UE in PLMN#1, the MWAB-gNB can establish an N2 connection with the AMF of PLMN#2. At the same time, through the PDU session of the MWAB-UE in PLMN#1, the MWAB-gNB can establish an N3 connection with the UPF of PLMN#2.

[0114] Based on the MWAB device architecture shown in Figure 3, the PLMN registered by the MWAB-UE and the PLMN registered by a normal UE can be the same. The MWAB-UE registers as a UE with PLMN core network #1 and establishes a PDU session. Through this PDU session, the MWAB-gNB can establish an N2 / N3 connection with the core network #2 of the same PLMN.

[0115] Currently, terminal devices can access the network through nodes with mobility. Figure 5 illustrates an integrated access backhaul (IAB) architecture for mobile access. The mobile IAB node consists of an IAB-mobile terminal (MT) and an IAB-distributed unit (DU). The IAB-MT is registered with the core network. The core network needs to authorize the current location of the IAB-MT. If the authorization is successful, the IAB-DU establishes an F1 link through the fixed IAB-Donor (IAB donor) on the ground. After that, the IAB-DU can provide network access services for the UE. In a mobile scenario, if the current location of the IAB-MT does not allow the IAB node to serve the UE as a mobile IAB node due to the movement of the IAB node, the core network will send a not authorization indication to the IAB-Donor, and the IAB-Donor will release the F1 connection between it and the IAB-DU.

[0116] In the architecture shown in Figure 5, the IAB donor CU is located on the ground. Therefore, regardless of the IAB node's mobility, it maintains a fixed anchor point (i.e., the IAB donor CU). This allows the IAB donor CU to promptly update information such as the tracking area code (TAC) and cell ID during the F1 connection between the IAB-DU and the IAB donor CU. In contrast, in the MWAB architecture, the MWAB incorporates all base station functions (including those of the CU and DU) and is mobile. When a normal UE (i.e., a UE accessing the network via the MWAB) moves with the MWAB, without a ground anchor point, the challenge is to promptly update the cell ID or tracking area ID broadcast by the MWAB. This allows for effective mobility restriction management for normal UEs, such as service area restrictions (SAR), and further supports requirements such as emergency services and charging.

[0117] To this end, embodiments of the present application provide a mobility management method and related devices that can implement the method, for implementing mobility management for mobile nodes that have network access service capabilities and are mobile. The mobility management can be understood as: for mobile nodes with mobility characteristics, updating the cell identifier and / or tracking area identifier broadcast by the mobility node based on the location of the mobile node. The mobility management also includes: for mobile nodes with mobility characteristics, updating the serving AMF of the mobile node based on the location of the mobile node.

[0118] First, the technologies and technical terms involved in this application are explained below.

[0119] (1) Mobile Node

[0120] The mobile node in the embodiment of the present application has a terminal function and a base station function. The mobile node can be composed of a terminal and a base station. The terminal can be referred to as a mobile node-terminal or a mobile node-UE, and the base station can be referred to as a mobile node-base station or a mobile node-gNB. The mobile node-terminal has the functions of an ordinary terminal device and can access the core network through a radio access network device. The mobile node-base station can provide network access services for ordinary terminal devices, and the connection between the ordinary terminal device and the core network (such as an N2 connection or an N3 connection) can be realized through a session between the mobile node-terminal and the core network.

[0121] In the mobile node, the mobile node-terminal and the mobile node-base station can each have their own identifier. In the embodiment of the present application, the identifier of the mobile node-terminal is referred to as the first identifier, and the identifier of the mobile node-base station is referred to as the second identifier. Optionally, the first identifier of the mobile node can be a generic public subscription identifier (GPSI), and the second identifier of the mobile node can be a gNB ID, which is not limited in this application.

[0122] An example of the mobile node may be a VMR device, and accordingly, the mobile node-terminal is a VMR-UE, and the mobile node-base station is a VMR-gNB.

[0123] Another example of the mobile node may be a WAB device, and accordingly, the mobile node-terminal is a WAB-UE, and the mobile node-base station is a WAB-gNB.

[0124] Another example of the mobile node may be a MWAB device, and accordingly, the mobile node-terminal is a MWAB-UE, and the mobile node-base station is a MWAB-gNB.

[0125] (2) First connection and second connection

[0126] In embodiments of the present application, a mobile node-base station can provide wireless access services to surrounding terminal devices, and the terminal devices can access the core network through the mobile node-base station. A connection can be established between the mobile node-base station and the core network to carry signaling and / or data transmission between the terminal devices accessed through the mobile node-base station and the core network.

[0127] The connection established between the mobile node-base station and the core network includes a first connection. The first connection, also known as an N2 connection or NGAP connection, is the connection between the mobile node-base station and the AMF, or in other words, an N2 interface exists between the mobile node-base station and the AMF. The first connection can carry signaling transmission between a terminal device accessed through the mobile node-base station and the core network.

[0128] Among them, the mobile node-base station can send a connection establishment request message (e.g., NG Setup request) to the AMF to request the establishment of a first connection. The connection establishment request message can transmit application layer information for the NG-C interface instance. Through the process of establishing the first connection, the application-level data required for the mobile node-base station and the AMF to correctly interoperate on the NG-C interface can be exchanged between the mobile node-base station and the AMF. Establishing the first connection between the mobile node-base station and the AMF can also be understood as establishing a context on the mobile node-base station and the AMF, or exchanging application layer information between the mobile node-base station and the AMF.

[0129] The connection established between the mobile node-base station and the core network also includes a second connection. The second connection, also known as the N3 connection, is the connection between the mobile node-base station and the UPF, or in other words, there is an N3 interface between the mobile node-base station and the UPF. The second connection can carry data transmission between the terminal device accessed through the mobile node-base station and the core network.

[0130] (3) First session and second session

[0131] In an embodiment of the present application, a mobile node-terminal may register with the core network as a terminal device. For example, a MWAB-UE may register with the AMF as a normal UE. A session may be established between the mobile node-terminal and the core network in which it is registered. The session may be a session between the mobile node-terminal and the UPF, where the UPF may be referred to as the anchor UPF for the session. Taking the 5G core network as an example, the session may be a PDU session.

[0132] The session between the mobile node-terminal and the core network may serve as a backhaul link of the first connection and / or the second connection.

[0133] In an embodiment of the present application, the session established between the mobile node-terminal and the core network may include a first session, and the first session is the backhaul link of the above-mentioned first connection. It can also be understood that the first session is used for wireless backhaul of the first connection. Taking the first session as the first PDU session as an example, the first PDU session is used for wireless backhaul of the N2 connection (PDU session for wireless backhauling of the N2). Alternatively, it can also be understood that the first session is used to carry the backhaul link of the above-mentioned first connection. Alternatively, the first session can be called: PDU session for Wireless backhauling, or PDU session for wireless backhauling of the N2 / N3.

[0134] For example, the mobile node-base station forwards the N2 message to the mobile node-terminal through the internal interface between the mobile node-base station and the mobile node-terminal. The mobile node-terminal uses the N2 message as the payload of the data packet and passes it to the anchor point UPF of the session through the first session. The anchor point UPF then forwards the data packet to the AMF accessed by the terminal device (the terminal device accesses the core network through the mobile node-base station) to complete the transmission of the N2 message.

[0135] In an embodiment of the present application, the session established between the mobile node-terminal and the core network may include a second session, and the second session is the backhaul link of the above-mentioned second connection. It can also be understood that the second session is used for wireless backhaul of the second connection. Taking the second session as the second PDU session as an example, the second PDU session is used for wireless backhaul of the N3 connection (PDU session for wireless backhauling of the N3). Alternatively, it can also be understood that the second session is used to carry the backhaul link of the above-mentioned second connection. Alternatively, the second session can be called: PDU session for Wireless backhauling, or PDU session for wireless backhauling of the N2 / N3.

[0136] For example, the mobile node-base station forwards the N3 message to the mobile node-terminal through the internal interface between the mobile node-terminal and the mobile node-terminal. The mobile node-terminal uses the N3 message as the payload of the data packet and passes it to the anchor point UPF of the session through the second session. The anchor point UPF then forwards the data packet to the UPF accessed by the terminal device (the terminal device accesses the core network through the mobile node-base station), thereby completing the transmission of the N3 message.

[0137] In one possible scenario, the anchor UPF of the first session and the anchor UPF of the second session are different, with the first session serving as the transmission link for the first connection and the second session serving as the backhaul link for the second connection. In another possible scenario, the anchor UPF of the first session and the anchor UPF of the second session are the same, with the first session serving as the transmission link for the first connection and the second session serving as the backhaul link for the second connection. In another possible scenario, the first and second sessions are the same session, meaning that a mobile node-terminal can establish a session to serve as the backhaul link for the first and second connections.

[0138] (4) Tracking area (TA)

[0139] A TA is a concept established by 3GPP for location management of terminal devices. Each TA corresponds to a tracking area code (TAC). Each TA has a unique identifier, the tracking area identity (TAI), which consists of a TAC, a mobile country code (MCC), and a mobile network code (MNC). Multiple TAs can form a tracking area list (TAL).

[0140] Figure 6 illustrates a schematic diagram of a tracking area (TA). Based on antenna coverage, each base station can be divided into multiple sectors, and each sector can be divided into multiple cells. A cell can belong to only one TA. Different cells within a base station can belong to different TAs, and cells within a TA can belong to different base stations. In the example of Figure 5, each hexagon represents a TA. Multiple TAs filled with a dotted pattern form one tracking area list, while multiple TAs filled with a right-slashed pattern form another tracking area list.

[0141] In an embodiment of the present application, a first correspondence relationship is stored in the mobile node. The first correspondence relationship can be stored in any storage area in the mobile node that is accessible to the mobile node-terminal. For example, the first correspondence relationship can be stored in a memory in the mobile node-terminal. In another possible implementation, the first correspondence relationship is stored in the mobile node and the AMF serving the mobile node.

[0142] The first corresponding relationship includes one or more of the following corresponding relationships:

[0143] -The correspondence between cell identification and geographic location information;

[0144] -The correspondence between tracking area identifiers and geographic location information;

[0145] -The correspondence between the AMF identifier and the geographic location information.

[0146] The geographic location information in the first correspondence may be information of a geographic area, or positioning system coordinate information, or address information (such as a street name), or a zip code, or other information that can be used to describe a geographic area, and this application is not limited thereto.

[0147] The cell identifier in the first correspondence may be a cell ID, an NR cell global identifier (NCGI), or a physical cell identifier (PCI), etc., which is not limited in this application.

[0148] The tracking area identifier in the first corresponding relationship may be a TAI or a TAC, which is not limited in this application.

[0149] The AMF identifier in the first correspondence may be an AMF ID, for example, a fully qualified domain name (FQDN), such as myhost.example.com. The AMF ID may also be an IP address, or a string of numbers and letters (for example, 4e0b2760-0356-42c4-b739-8d6aaa491b63), or a universally unique identifier (UUID). This application is not limited.

[0150] Taking the first correspondence relationship including the correspondence relationship between cell identifier and geographic location information, the correspondence relationship between tracking area identifier and geographic location information, and the correspondence relationship between AMF identifier and geographic location information as an example, the first correspondence relationship can be presented as a list of correspondence relationships between cell identifier and geographic location, a list of correspondence relationships between tracking area identifier and geographic location information, and a list of correspondence relationships between AMF identifier and geographic location information.

[0151] Illustratively, Table 1 shows a data structure of a list of correspondences between cell identifiers and geographic locations.

[0152] Table 1: Correspondence between cell identifiers and geographic locations

[0153] The list of correspondences between cell identifiers and geographical locations may include one or more cell identifiers and geographical areas corresponding to the one or more cell identifiers.

[0154] For example, Table 2 shows a data structure of a list of correspondences between tracking area identifiers and geographic location information.

[0155] Table 2: Correspondence between tracking area identifiers and geographic locations

[0156] The list of correspondences between tracking area identifiers and geographical locations may include one or more tracking area identifiers and geographical areas corresponding to the one or more tracking area identifiers.

[0157] For example, Table 3 shows a data structure of a list of correspondences between AMF identifiers and geographic location information.

[0158] Table 3: Correspondence between AMF identifiers and geographic locations

[0159] Among them, the list of correspondences between AMF identifiers and geographic locations may include one or more AMF identifiers, and the geographical areas corresponding to the one or more AMF identifiers respectively.

[0160] It should be understood that the embodiment of the present application does not limit the data structure of the first corresponding relationship.

[0161] Exemplarily, Table 4 shows another data structure of a list of correspondences between cell identifiers, tracking area identifiers, AMF identifiers and geographic locations.

[0162] Table 4: Correspondence between cell ID, tracking area ID, AMF ID and geographic location

[0163] It is worth noting that the above correspondence list may include one entry or multiple entries, and may be updated by the mobile node or other network elements or systems thereafter.

[0164] In one possible implementation, the first correspondence stored in the mobile node and the first correspondence stored in the AMF serving the mobile node are related to the mobile route of the mobile node. Taking the mobile node as an example, where the mobile node is a MWAB device on a vehicle with a fixed route, the cell identifier and tracking area identifier in the first correspondence stored in the MWAB device are the cell identifier and tracking area identifier of an access network device deployed by the network operator contracted by the MWAB device on the route of the MWAB device.

[0165] In the embodiment of the present application, the mobile node may obtain the first correspondence relationship in the following ways:

[0166] Mode 1-1: A first corresponding relationship is pre-configured in the core network, and the first corresponding relationship can be obtained during the process of the mobile node registering with the core network.

[0167] For example, the first correspondence relationship can be preconfigured in a network element such as an AMF, PCF, or UDM in the core network. During the process of the mobile node registering with the core network, the network element in the core network will send necessary information for access to the mobile node, where the necessary information includes the first correspondence relationship. One implementation method is: the network element in the core network will send the necessary information for access to the mobile node-terminal, and the mobile node-terminal may send the first correspondence relationship to the mobile node-base station based on the internal interface between the mobile node-terminal and the mobile node-base station.

[0168] It should be understood that the information interaction between the mobile node-terminal and the mobile node-base station may also be carried out in other ways, such as a shared memory way, which is not limited in this application.

[0169] Exemplarily, taking a mobile node with a fixed operating route as an example, a first corresponding relationship corresponding to the mobile node can be configured according to the operating route of the mobile node, and the first corresponding relationship can be configured in the above-mentioned network element in the core network.

[0170] Method 1-2: Address information of a first network element is preconfigured in the core network, and the first correspondence relationship is stored in the first network element. During the process of the mobile node registering with the core network, the address information of the first network element can be obtained, and the first correspondence relationship can be obtained from the first network element based on the address information of the first network element.

[0171] For example, the address information of the first network element can be pre-configured in the network elements such as AMF, PCF or UDM in the core network. During the process of the mobile node registering with the core network, the above-mentioned network element in the core network will send the necessary information for access to the mobile node, and the necessary information includes the address information of the first network element. The mobile node can obtain the first corresponding relationship from the first network element based on the address information of the first network element. One implementation method is: the above-mentioned network element in the core network will send the necessary information for access to the mobile node-terminal, and the necessary information includes the address information of the first network element. The mobile node-terminal can obtain the first corresponding relationship from the first network element based on the address information of the first network element. The mobile node-terminal can send the first corresponding relationship to the mobile node-base station based on the internal interface between it and the mobile node-base station.

[0172] The first network element may be a network element in an operations, administration, and management (OAM) system, or other network element storing a first corresponding relationship, or the first network element may also be understood as an OAM system, which is not limited in this application.

[0173] Optionally, the address information of the first network element may be an FQDN, an IP address, a string of numbers and letters (for example, 4e0b2760-0356-42c4-b739-8d6aaa491b63), or a universally unique identifier (UUID), which is not limited in this application.

[0174] Optionally, the address information of the first network element can be configured in network elements such as AMF, PCF or UDM in the core network, which is not limited in this application.

[0175] Method 1-3: When the first correspondence relationship is stored in the AMF serving the mobile node, the AMF may send the first correspondence relationship to the mobile node. For example, after the mobile node initiates a registration request to the AMF, the AMF may send the first correspondence relationship to the mobile node.

[0176] It should be understood that the above merely exemplifies several possible implementations of the mobile node acquiring the first correspondence, and the present application does not limit this.

[0177] In this embodiment of the present application, the AMF may obtain the first correspondence relationship in the following ways:

[0178] Method 2-1: The first correspondence relationship is pre-configured in the core network, and the AMF can obtain the first correspondence relationship during the process of the mobile node registering with the core network.

[0179] For example, the first correspondence relationship may be pre-configured in the PCF or UDM in the core network. If the first correspondence relationship is configured in the PCF or UDM, the AMF may obtain the first correspondence relationship from the PCF or UDM.

[0180] Method 2-2: The address information of the first network element is pre-configured in the core network, and the AMF can obtain the first corresponding relationship from the first network element according to the address information of the first network element.

[0181] For example, after the mobile node initiates a registration request to the AMF, the AMF can obtain the address information of the first network element, and can obtain the first corresponding relationship from the first network element based on the address information of the first network element.

[0182] Exemplarily, the subscription information of the mobile node may include a first correspondence that matches the mobile node's route. After receiving the registration request message from the mobile node, the AMF may obtain the subscription information of the mobile node, including the address information of the OAM, from the UDM. The AMF may send a request message to the OAM based on the OAM address information, requesting to obtain the first correspondence. The OAM may send the first correspondence to the AMF based on the request message.

[0183] Mode 2-3: When the first correspondence relationship is stored in the mobile node, the mobile node may send the first correspondence relationship to the AMF serving the mobile node.

[0184] It should be understood that the above only exemplifies several possible implementation methods for AMF to obtain the first correspondence, and this application does not limit this.

[0185] The embodiments of the present application are described below with reference to the accompanying drawings.

[0186] Refer to Figure 7, which is a flow chart of a mobility management method provided in an embodiment of the present application. In this method, the mobile node-terminal has registered with the third AMF, and the third AMF is the AMF serving the mobile node-terminal. A first session is established between the mobile node-terminal and the UPF (not shown in the figure) in the core network to which it is registered. A first connection is established between the mobile node-base station and the first AMF. The mobile node-base station can provide network access services for the first terminal device. For the first terminal device that accesses, communication can be performed with the first AMF based on the first connection. That is, the first AMF can be used to provide services for the first terminal device that accesses the mobile node-base station. Among them, the first session is the backhaul link of the first connection.

[0187] The mobile node and the third AMF store a first correspondence relationship. For details on how the mobile node and the third AMF obtain the first correspondence relationship and the content of the first correspondence relationship, refer to the relevant content of the aforementioned embodiment.

[0188] As shown in Figure 7, the process may include the following steps:

[0189] Step 701: The third AMF obtains second geographic location information and determines the cell identifier / tracking area identifier corresponding to the second geographic location information based on the first correspondence. The second geographic location information is the geographic location information corresponding to the cell where the mobile node resides.

[0190] In one possible implementation, the third AMF may obtain an identifier of the cell in which the mobile node resides from a first RAN, where the first RAN is a radio access network device serving the mobile node. After obtaining the identifier of the cell in which the mobile node resides, the third AMF may determine the geographic location information of the mobile node based on the cell identifier. The third AMF may use this geographic location information as second geographic location information, query the first correspondence using the second geographic location information, and obtain the cell identifier and / or tracking area identifier corresponding to the second geographic location information.

[0191] In one possible implementation, the third AMF can subscribe to the identifier of the cell where the mobile node-terminal resides. That is, when the mobile node-terminal resides in a new cell, the third AMF can obtain the identifier of the cell where the mobile node-terminal currently resides from the current serving RAN of the mobile node-terminal.

[0192] Optionally, the third AMF may determine whether to subscribe to the identifier of the cell where the mobile node-terminal resides based on the subscription information of the mobile node. For example, if the subscription information of the mobile node indicates that it is necessary to subscribe to the identifier of the cell where the mobile node-terminal resides, or the subscription information indicates that the activity range of the mobile node may exceed the range of a cell or a tracking area, or exceed the range corresponding to an AMF, the third AMF determines that it is necessary to subscribe to the identifier of the cell where the mobile node-terminal resides.

[0193] It should be understood that “determining the cell identifier / tracking area identifier corresponding to the second geographical location information according to the first correspondence” may include the following situations:

[0194] Case 1: If the first correspondence includes a correspondence between a cell identifier and geographic location information, then the cell identifier corresponding to the second geographic location information is determined according to the first correspondence;

[0195] Case 2: If the first correspondence includes a correspondence between a tracking area identifier and geographic location information, then the tracking area identifier corresponding to the second geographic location information is determined according to the first correspondence;

[0196] Case 3: If the first correspondence includes the correspondence between the cell identifier and the geographic location information, and the correspondence between the tracking area identifier and the geographic location information, the cell identifier and the tracking area identifier corresponding to the second geographic location information are determined according to the first correspondence.

[0197] Step 702: The third AMF determines the cell identifier / tracking area identifier corresponding to the second geographic location information. If it is different from the cell identifier / tracking area identifier broadcast by the mobile node-base station, step 703 is executed.

[0198] One possible scenario is that the cell identifier / tracking area identifier corresponding to the second geographical location information is different from the cell identifier / tracking area identifier broadcast by the mobile node-base station, which may include the following scenarios:

[0199] Case 1: the cell identifier corresponding to the second geographical location information queried based on the first correspondence is different from the cell identifier broadcast by the mobile node-base station.

[0200] Case 2: The tracking area identifier corresponding to the second geographical location information queried based on the first correspondence is different from the tracking area identifier broadcast by the mobile node-base station;

[0201] Case 3: The cell identifier corresponding to the second geographic location information queried based on the first correspondence relationship is different from the cell identifier broadcast by the mobile node-base station, and the tracking area identifier corresponding to the second geographic location information queried based on the first correspondence relationship is different from the tracking area identifier broadcast by the mobile node-base station.

[0202] Step 703: The third AMF sends notification information to the mobile node (e.g., mobile node-terminal or mobile node-base station), where the notification information is used to instruct or prompt the mobile node-terminal to obtain the current geographic location information, or to instruct or prompt the mobile node to update the broadcast cell identifier / tracking area identifier.

[0203] The notification information can also be understood as being used to trigger the mobile node-terminal to obtain the current geographical location information, and further trigger the mobile node-terminal to update the cell identifier and / or tracking area identifier broadcast by the mobile node-base station according to the obtained first geographical location information.

[0204] Exemplarily, if the cell identifier corresponding to the second geographical location information is different from the cell identifier broadcast by the mobile node-base station, the notification information is used to instruct or prompt the mobile node-base station to update the broadcast cell identifier.

[0205] Exemplarily, if the tracking area identifier corresponding to the second geographic location information is different from the tracking area identifier broadcast by the mobile node-base station, the notification information is used to instruct or prompt the mobile node-base station to update the broadcast tracking area identifier.

[0206] Exemplarily, if the cell identifier corresponding to the second geographic location information is different from the cell identifier broadcast by the mobile node-base station, and the tracking area identifier corresponding to the second geographic location information is different from the tracking area identifier broadcast by the mobile node-base station, then the notification information is used to instruct or prompt the mobile node-base station to update the broadcast cell identifier and tracking area identifier.

[0207] In one possible implementation, the third AMF sends a first notification message to the mobile node-base station, where the first notification message is used to instruct or prompt the mobile node-base station to update the broadcast information (for example, including a cell identifier and / or a tracking area identifier); the mobile node-base station can send a second notification message to the mobile node-terminal through an internal interface between it and the mobile node-terminal, where the second notification message is used to instruct or prompt the mobile node-terminal to obtain the current geographic location information, and obtain the cell identifier and / or tracking area identifier corresponding to the current geographic location information based on the first corresponding relationship.

[0208] It should be understood that the information interaction between the mobile node-terminal and the mobile node-base station may also be carried out in other ways, such as a shared memory way, which is not limited in this application.

[0209] Step 704: The mobile node (mobile node-terminal) obtains first geographic location information and obtains the cell identifier / tracking area identifier corresponding to the first geographic location information according to the first correspondence. The first geographic location information indicates the current geographic location of the mobile node (mobile node-terminal).

[0210] The mobile node-terminal can obtain the first geographic location information by initiating a positioning process (for example, the mobile node-terminal sends a positioning request message to the location management function (LMF) to obtain the first geographic location information), or obtain the first geographic location information through the global navigation satellite system (GNSS, also known as the global satellite navigation system) function of the mobile node, which is not limited in this application.

[0211] It should be understood that “obtaining the cell identifier / tracking area identifier corresponding to the first geographical location information according to the first corresponding relationship” may include the following situations:

[0212] Case 1: If the first correspondence includes a correspondence between a cell identifier and geographic location information, then the cell identifier corresponding to the first geographic location information is obtained according to the first correspondence;

[0213] Case 2: If the first correspondence includes a correspondence between a tracking area identifier and geographic location information, then obtaining the tracking area identifier corresponding to the first geographic location information according to the first correspondence;

[0214] Case 3: If the first correspondence includes the correspondence between the cell identifier and the geographic location information, and the correspondence between the tracking area identifier and the geographic location information, the cell identifier and the tracking area identifier corresponding to the first geographic location information are obtained according to the first correspondence.

[0215] Step 705: After obtaining the cell identifier / tracking area identifier corresponding to the first geographic location information through an internal interface or other means, the mobile node-base station broadcasts the cell identifier / tracking area identifier corresponding to the first geographic location information.

[0216] Optionally, the mobile node-base station may include a cell identifier and / or a tracking area identifier corresponding to the first geographical location information in a cell broadcast message, such as a system information block (SIB).

[0217] In one possible implementation, before updating the broadcast cell identifier / tracking area identifier, the mobile node-base station can determine whether the cell identifier / tracking area identifier corresponding to the first geographic location information is the same as the currently broadcast cell identifier / tracking area identifier. If different, the broadcast cell identifier / tracking area identifier is updated.

[0218] In another possible implementation, before the mobile node-base station updates the broadcast cell identifier / tracking area identifier, the mobile node-terminal may determine whether the cell identifier / tracking area identifier corresponding to the first geographic location information is the same as the cell identifier / tracking area identifier currently broadcast by the mobile node-base station. If they are different, the mobile node-terminal sends the broadcast cell identifier / tracking area identifier to be updated to the mobile node-base station. In one possible implementation, the mobile node-terminal may send the cell identifier / tracking area identifier corresponding to the first geographic location information to the mobile node-base station via an internal interface between the mobile node-base station and the mobile node-base station. The mobile node-terminal may obtain the cell identifier / tracking area identifier currently broadcast by the mobile node-base station via the internal interface or other means.

[0219] Optionally, before the mobile node-terminal sends the cell identifier / tracking area identifier corresponding to the first geographic location information to the mobile node-base station, the mobile node-terminal may further determine whether the cell identifier / tracking area identifier corresponding to the first geographic location information is the same as the cell identifier / tracking area identifier broadcast by the mobile node-base station. If they are different, the mobile node-terminal may send the cell identifier / tracking area identifier corresponding to the first geographic location information to the mobile node-base station. The mobile node-terminal may obtain the cell identifier / tracking area identifier currently broadcast by the mobile node-base station through an internal interface or other means.

[0220] It should be understood that the cell identifier / tracking area identifier corresponding to the first geographical location information is different from the cell identifier / tracking area identifier broadcast by the mobile node-base station, which may include the following situations:

[0221] Case 1: the cell identifier corresponding to the first geographical location information is different from the cell identifier broadcast by the mobile node-base station;

[0222] Case 2: The tracking area identifier corresponding to the first geographical location information is different from the tracking area identifier broadcast by the mobile node-base station;

[0223] Case 3: The cell identifier corresponding to the first geographic location information is different from the cell identifier broadcast by the mobile node-base station, and the tracking area identifier corresponding to the second geographic location information is different from the tracking area identifier broadcast by the mobile node-base station.

[0224] It should be understood that the information interaction between the mobile node-terminal and the mobile node-base station may also be carried out in other ways, such as a shared memory way, which is not limited in this application.

[0225] In a possible implementation, the process shown in FIG7 may further include the following steps:

[0226] Step 706: The mobile node (mobile node-base station) sends a first message to the first AMF, where the first message is used to request to update the configuration information of the mobile node (mobile node-base station), and the first message includes the cell identifier and / or tracking area identifier corresponding to the first geographic location information.

[0227] Exemplarily, the mobile node-base station can send an NGAP update request message or a RAN Configuration Update message to the first AMF, which includes information such as the cell identifier and tracking area identifier currently broadcast by the mobile node-base station, wherein the cell identifier and tracking area identifier currently broadcast by the mobile node-base station are the cell identifier and tracking area identifier corresponding to the first geographic location information.

[0228] Optionally, the first AMF may also send an NGAP update response message or a RAN CONFIGURATION UPDATE ACKNOWLEDGE message to the mobile node-base station, which is used to confirm the configuration update.

[0229] In a possible implementation, the process shown in FIG7 may further include the following steps:

[0230] Step 707: The mobile node (e.g., mobile node-terminal, or mobile node-base station) sends the cell identifier / tracking area identifier corresponding to the first geographic location information to the third AMF.

[0231] Step 708: The third AMF updates the context information of the mobile node according to the cell identifier / tracking area identifier corresponding to the first geographic location area.

[0232] In one possible implementation, steps 701 to 703 in the process shown in Figure 7 may be omitted. Accordingly, in step 704, the mobile node-terminal may trigger acquisition of the geographic location information of the mobile node-terminal by other means, such as periodically initiating a positioning process to obtain the geographic location information of the mobile node-terminal, or periodically obtaining the geographic location information of the mobile node-terminal through the GNSS of the mobile node-terminal. This application is not limited thereto. Accordingly, the third AMF may not store the first correspondence.

[0233] In one possible implementation, the mobile node (e.g., mobile node-terminal) may obtain the first correspondence from the first network element according to a set period, and timely update the locally stored first correspondence. Furthermore, the mobile node may also send the updated first correspondence to the AMF serving the mobile node.

[0234] In another possible implementation, the AMF serving the mobile node may obtain the first correspondence from the first network element according to a set period, and timely update the locally stored first correspondence. Furthermore, the AMF may also send the updated first correspondence to the mobile node.

[0235] In another possible implementation, the mobile node (eg, mobile node-terminal) may obtain the first correspondence from the first network element when the stored first correspondence cannot cover the current geographical location of the mobile node.

[0236] Based on the process shown in Figure 7 above, in one possible scenario, the AMF (first AMF) providing services for the first terminal device accessing the mobile node and the AMF (third AMF) serving the mobile node are located in the same PLMN. In another possible scenario, the AMF (first AMF) providing services for the first terminal device accessing the mobile node and the AMF (third AMF) serving the mobile node are located in different PLMNs.

[0237] Based on the process shown in Figure 7 above, the mobile node can query the first corresponding relationship according to the current geographical location information, obtain the corresponding cell identifier and / or tracking area identifier, and update the cell identifier and / or tracking area identifier broadcast by the mobile node according to the cell identifier and / or tracking area identifier, so that the information broadcast by the mobile node can be updated in time according to the current location of the mobile node. Then, based on the updated broadcast information, the terminal device (such as the above-mentioned first terminal device) that accesses the network through the mobile node can perform tracking area update (TAU), location report (location report), AMF reallocation (AMF reallocation) and other processes, thereby realizing mobility management.

[0238] Furthermore, the AMF serving the mobile node (such as the third AMF mentioned above) can trigger the mobile node to update the information broadcast by the mobile node based on the current geographical location information and the first correspondence after determining that the cell where the mobile node resides has changed. Compared with the mobile node periodically executing the positioning process to obtain the current geographical location information, it can save the positioning cost of the mobile node, reduce signaling overhead, and save power consumption.

[0239] Refer to Figure 8, which is a flow chart of a mobility management method provided in an embodiment of the present application. In this method, the mobile node-terminal has registered with the third AMF, and the third AMF is the AMF serving the mobile node-terminal. A first session is established between the mobile node-terminal and the UPF (not shown in the figure) in the core network to which it is registered. A first connection is established between the mobile node-base station and the first AMF. The mobile node-base station can provide network access services for the first terminal device. For the first terminal device that accesses, communication can be performed with the first AMF based on the first connection. That is, the first AMF can be used to provide services for the first terminal device that accesses the mobile node-base station. Among them, the first session is the backhaul link of the first connection.

[0240] The mobile node and the third AMF store a first correspondence relationship. For details on how the mobile node and the third AMF obtain the first correspondence relationship and the content of the first correspondence relationship, refer to the relevant content of the aforementioned embodiment.

[0241] As shown in FIG8 , the process may include the following steps:

[0242] Step 801: The third AMF obtains second geographic location information and determines the AMF identifier corresponding to the second geographic location information based on a first correspondence. The second geographic location information is the geographic location information corresponding to the cell where the mobile node resides.

[0243] For the specific implementation method of the third AMF obtaining the second geographic location information, please refer to step 701 in Figure 7.

[0244] Step 802: The third AMF determines that the AMF identifier corresponding to the second geographic location information is different from the identifier of the first AMF, then executes step 803.

[0245] A first connection is established between the first AMF and the mobile node-base station.

[0246] In one possible implementation, the mobile node-base station stores context information related to the first AMF. The third AMF may obtain the context information related to the first AMF stored in the mobile node-base station and compare the AMF identifier corresponding to the second geographic location information with the identifier of the first AMF.

[0247] Step 803: The third AMF sends notification information to the mobile node (e.g., mobile node-terminal or mobile node-base station), where the notification information is used to instruct or prompt the mobile node-base station to update the AMF used to provide services for the first terminal device accessing the mobile node.

[0248] In one possible implementation, the notification information can also be understood as being used to trigger the mobile node to obtain the current geographic location information, and then trigger the mobile node to update the AMF of the mobile node-base station connection based on the obtained first geographic location information.

[0249] In one possible implementation, the third AMF sends a first notification message to the mobile node-base station, and the first notification message is used to instruct or prompt the mobile node-base station to update the AMF used to provide services for the first terminal device accessing the mobile node; the mobile node-base station can send a second notification message to the mobile node-terminal through the internal interface between it and the mobile node-terminal, and the second notification message is used to instruct or prompt the mobile node-terminal to obtain the current geographic location information, and obtain the AMF identifier corresponding to the current geographic location information based on the first correspondence.

[0250] It should be understood that the information interaction between the mobile node-terminal and the mobile node-base station may also be carried out in other ways, such as a shared memory way, which is not limited in this application.

[0251] Step 804: The mobile node (mobile node-terminal) obtains first geographic location information and obtains an AMF identifier corresponding to the first geographic location information according to a first correspondence. The first geographic location information indicates the current geographic location of the mobile node (mobile node-terminal).

[0252] For a specific implementation of the mobile node-terminal acquiring the first geographical location information, reference may be made to step 704 in FIG. 7 .

[0253] In this process, the AMF identifier corresponding to the first geographic location information is used as the identifier of the second AMF as an example.

[0254] Step 805: The mobile node (mobile node-base station) obtains the AMF identifier corresponding to the first geographic location information through the content interface or other means.

[0255] In one possible implementation, the mobile node-terminal may send the AMF identifier corresponding to the first geographic location information to the mobile node-base station through an internal interface between the mobile node-terminal and the mobile node-base station.

[0256] Optionally, before the mobile node-terminal sends the AMF identifier corresponding to the first geographic location information to the mobile node-base station, the mobile node-terminal can further determine whether the AMF identifier corresponding to the first geographic location information is the same as the first AMF identifier. If different, the AMF identifier corresponding to the first geographic location information is sent to the mobile node base station.

[0257] It should be understood that the information interaction between the mobile node-terminal and the mobile node-base station may also be carried out in other ways, such as a shared memory way, which is not limited in this application.

[0258] In one possible implementation, after the mobile node-base station obtains the AMF identifier corresponding to the first geographic location information, if it is determined that the AMF identifier is different from the first AMF identifier, step 806 is executed.

[0259] Optionally, the mobile node-base station stores context information related to the first AMF, and the mobile node-base station can compare the AMF identifier corresponding to the first geographic location information with the identifier of the first AMF.

[0260] Step 806: The mobile node-base station sends a connection establishment request message to the second AMF according to the AMF identifier corresponding to the first geographic location information (the identifier of the second AMF in this process). The connection establishment request message is used to request establishment of a connection between the mobile node-base station and the second AMF.

[0261] In one possible implementation, the mobile node-base station sends an NGAP setup request message to the second AMF, which is used to request establishment of a connection between the mobile node-base station and the second AMF. Optionally, the second AMF may also send an NGAP setup response message to the mobile node-base station, which is used to confirm the establishment of the connection.

[0262] The connection between the second AMF and the mobile node-base station enables transmission between the first terminal device accessing the mobile node-base station and the core network. The first session can serve as the backhaul link for the connection between the mobile node-base station and the second AMF.

[0263] In a possible implementation, the process shown in FIG8 may further include the following steps:

[0264] Step 807: The mobile node (mobile node-base station) sends a connection release request message to the first AMF. The connection release request message is used to request the release of the connection (i.e., the first connection) between the mobile node-base station and the first AMF, thereby saving resource overhead.

[0265] In one possible implementation, the mobile node-base station sends an NGAP release request message or a RAN Configuration Update message to the first AMF, which is used to release the first connection. Optionally, the first AMF may also send an NGAP release response message or a RAN CONFIGURATION UPDATE ACKNOWLEDGE message to the mobile node-base station, which is used to confirm the release of the connection.

[0266] In one possible implementation, steps 801 to 804 in the process shown in FIG8 may be omitted. Accordingly, in step 805, the mobile node-terminal may trigger acquisition of the geographic location information of the mobile node-terminal by other means, such as by periodically initiating a positioning process to obtain the geographic location information of the mobile node-terminal, or periodically obtaining the geographic location information of the mobile node-terminal through the GNSS of the mobile node-terminal. This application is not limited thereto. Accordingly, the third AMF may not store the first correspondence.

[0267] In one possible implementation, the mobile node (e.g., mobile node-terminal) may obtain the first correspondence from the first network element according to a set period, and timely update the locally stored first correspondence. Furthermore, the mobile node may also send the updated first correspondence to the AMF serving the mobile node.

[0268] In another possible implementation, the AMF serving the mobile node may obtain the first correspondence from the first network element according to a set period, and timely update the locally stored first correspondence. Furthermore, the AMF may also send the updated first correspondence to the mobile node.

[0269] In another possible implementation, the mobile node (eg, mobile node-terminal) may obtain the first correspondence from the first network element when the stored first correspondence cannot cover the current geographical location of the mobile node.

[0270] Based on the process shown in Figure 8 above, in one possible scenario, the AMF (first AMF) providing services for the first terminal device accessing the mobile node and the AMF (third AMF) serving the mobile node are located in the same PLMN. In another possible scenario, the AMF (first AMF) providing services for the first terminal device accessing the mobile node and the AMF (third AMF) serving the mobile node are located in different PLMNs.

[0271] Based on the process shown in Figure 8 above, the mobile node can query the first corresponding relationship according to the current geographical location information, obtain the corresponding AMF identifier, and establish a connection between the mobile node-base station and the AMF according to the AMF identifier, so that the connection between the mobile node and the core network can be updated in time according to the current location of the mobile node to ensure that transmission services are provided for terminal devices accessing the mobile node (such as the above-mentioned first terminal device), so that the terminal devices accessing the network through the mobile node (such as the above-mentioned first terminal device) perform AMF reallocation (AMF reallocation) and other processes, thereby realizing mobility management.

[0272] Furthermore, the AMF serving the mobile node (such as the third AMF mentioned above) can trigger the mobile node to determine the AMF corresponding to the current geographical location information based on the current geographical location information and the first correspondence after determining that the cell where the mobile node resides has changed. Compared with the mobile node periodically executing the positioning process to obtain the current geographical location information, it can save the positioning cost of the mobile node, reduce signaling overhead, and save power consumption.

[0273] It should be understood that the process shown in Figure 7 above can be combined with the process shown in Figure 8. That is, the mobile node can timely update the information broadcast by the mobile node (for example, including the cell identifier and / or tracking area identifier) ​​according to the current geographical location, thereby realizing mobility management, and can also timely establish a connection with the AMF matching the current location, so as to better target the terminal device accessing the mobile node and ensure the transmission between it and the core network.

[0274] Taking the mobile node as a MWAB device as an example, Figure 9 shows a schematic diagram of a mobility management process, which is an example of the process shown in Figure 7 and / or Figure 8. The process is described by taking the example of the AMF (first AMF) serving the first UE (i.e., the UE accessing the network through the MWAB device) and the AMF (third AMF) serving the MWAB being located in different PLMNs. Specifically, the core network to which the MWAB-UE is registered belongs to PLMN#1, and the core network to which the first UE is registered belongs to PLMN#2. A first connection is established between the MWAB-gNB and the first AMF in PLMN#2.

[0275] As shown in FIG9 , the process may include the following steps:

[0276] Step 901: The MWAB-UE registers as a UE to the core network of PLMN#1.

[0277] The embodiment of the present application does not limit the registration process of the MWAB-UE.

[0278] Step 902: A first session is established between the MWAB-UE and the UPF in PLMN#1.

[0279] The embodiment of the present application does not limit the process of establishing the first session.

[0280] Step 903: A first connection is established between the MWAB-gNB and the first AMF in PLMN#2.

[0281] Optionally, when the first UE accesses the network according to the cell ID broadcast by the MWAB-gNB, the MWAB-gNB initiates a first connection establishment process for the first UE to the first AMF in PLMN#2.

[0282] In one possible implementation, the MWAB-gNB sends a connection establishment request message to the first AMF, where the connection establishment request message is used to request establishment of a connection between the MWAB-gNB and the first AMF. Optionally, the first AMF may also send a connection establishment response message to the MWAB-gNB.

[0283] Optionally, the connection establishment request message may be an NG setup request message, which includes information such as the cell ID and TAC broadcast by the MWAB-gNB.

[0284] Optionally, the connection establishment response message may be an NG setup response message, which is used to confirm that the connection between the MWAB-gNB and the first AMF has been established.

[0285] Step 904a: The MWAB-UE obtains a first correspondence from the OAM in PLMN#2.

[0286] In one possible implementation, after the MWAB-UE sends a registration request message to the third AMF, the third AMF may send necessary information for access to the MWAB-gNB, where the necessary information includes the address information of the OAM. The MWAB-gNB may send the OAM address information to the MWAB-UE via an interface between the MWAB-gNB and the MWAB-UE. The MWAB-UE may interact with the OAM in PLMN#2 through a first session and obtain the first correspondence from the OAM.

[0287] Step 905a: The third AMF obtains the first correspondence from the OAM in PLMN#2.

[0288] In one possible implementation, the third AMF obtains the first correspondence from the OAM in PLMN#2 according to the address information of the OAM.

[0289] Step 906: The third AMF obtains the cell ID of the cell where the MWAB-UE resides from the serving RAN of the MWAB-UE.

[0290] Step 907: The third AMF queries the first correspondence according to the geographic location information (i.e., the second geographic location information) corresponding to the cell ID of the cell where the MWAB-UE resides, and obtains the corresponding cell ID, TAC and AMF identifier.

[0291] Due to the mobility of MWAB devices, as the MWAB device moves, the MWAB-UE may be handed over between different RANs. In other words, the cell where the MWAB-UE resides changes. It is necessary to promptly update the cell ID and / or TAC broadcast by the MWAB-gNB according to the current geographical location of the MWAB-UE to provide access services to surrounding terminal devices. When the MWAB-UE moves out of the geographical location area corresponding to the first AMF, the MWAB-gNB needs to promptly establish a connection with the new AMF to ensure that the accessed terminal device can transmit data with the core network.

[0292] In this process, the queried cell ID is different from the cell ID broadcast by MWAB-gNB, the queried TAC is different from the TAC broadcast by MWAB-gNB, and the queried AMF identifier is different from the first AMF identifier.

[0293] Step 908: The third AMF sends a notification message to the MWAB-UE, where the notification message is used to trigger the MWAB-UE to obtain its current geographic location.

[0294] Step 909: The MWAB-UE obtains first geographic location information, which is the geographic location information of the MWAB-UE's current location. The MWAB-UE queries a first correspondence based on the first geographic location information to obtain a cell ID, TAC, and AMF identifier corresponding to the first geographic location information.

[0295] For the specific implementation of the MWAB-UE obtaining the first geographic location information, please refer to the relevant content in Figure 7.

[0296] If the MWAB-UE determines that the queried cell ID is different from the cell ID broadcast by the MWAB-gNB, and / or the queried TAC is different from the TAC broadcast by the MWAB-gNB, option 1 is executed to update the information broadcast by the MWAB-gNB.

[0297] Option 1 includes the following steps:

[0298] Step 910: The MWAB-UE sends the cell ID and / or TAC (herein referred to as the new cell ID and / or TAC) corresponding to the first geographic location information to the MWAB-gNB through the interface between the MWAB-UE and the MWAB-gNB.

[0299] Step 911: The MWAB-gNB updates the broadcast information, where the updated information includes the new cell ID and / or TAC.

[0300] For the specific implementation of this step, please refer to the relevant content in Figure 7.

[0301] Step 912: The MWAB-gNB sends a first message to the first AMF, where the first message includes a new cell ID and / or TAC. The first message is used to request an update of the configuration information of the MWAB-gNB.

[0302] For the specific implementation of this step, please refer to the relevant content in Figure 7.

[0303] Step 913: Optionally, the MWAB-UE (or MWAB-gNB) may also send the new cell ID and / or TAC to the third AMF.

[0304] Step 914: The third AMF updates the context information of the MWAB-UE according to the new cell ID and / or TAC.

[0305] If the MWAB-UE determines that the queried AMF identifier is different from the identifier of the first AMF, option 2 is executed to establish a connection with the new AMF.

[0306] Option 2 includes the following steps:

[0307] Step 915: The MWAB-UE sends the AMF identifier corresponding to the first geographic location information (here taking the identifier of the second AMF as an example) to the MWAB-gNB through the interface between the MWAB-UE and the MWAB-gNB.

[0308] Step 916: The MWAB-gNB sends a connection establishment request message to the second AMF according to the identifier of the second AMF. The connection establishment request message is used to request to establish a connection between the MWAB-gNB and the second AMF.

[0309] For the specific implementation of this step, please refer to step 808 in Figure 8.

[0310] Step 917: The MWAB-gNB sends a connection release request message to the first AMF, where the connection release request message is used to request the release of the connection between the MWAB-gNB and the first AMF.

[0311] For the specific implementation of this step, please refer to step 809 in Figure 8.

[0312] In one possible implementation, if the MWAB-UE determines that the queried cell ID is different from the cell ID broadcast by the MWAB-gNB, the queried TAC is different from the TAC broadcast by the MWAB-gNB, and the queried AMF identifier is different from the identifier of the first AMF, then the queried cell ID, TAC and AMF identifier can be sent to the MWAB-gNB together through the interface between the MWAB-gNB, that is, step 910 and step 915 can be merged into one step.

[0313] It should be understood that the timing relationship of each step in the process shown in FIG9 is only a possible example and is not limited in this application.

[0314] Refer to Figure 10, which is a flow chart of another mobility management method provided in an embodiment of the present application. In Figure 10, except that the way in which the third AMF obtains the first correspondence is different from the process shown in Figure 9, the implementation methods of the remaining steps can refer to the process shown in Figure 9. In the process shown in Figure 10, the MWAB-UE can provide the first correspondence to the AMF. Specifically, in step 904b, the MWAB-UE obtains the first correspondence from the OAM in PLMN#2, and in step 905b, the MWAB-UE sends the first correspondence to the third AMF. This implementation method does not require functional enhancement of the AMF and can reduce the implementation complexity.

[0315] See Figure 11, which is a flowchart of another mobility management method provided in an embodiment of the present application. In Figure 11, except that the manner in which the MWAB-UE obtains the first correspondence relationship differs from the process shown in Figure 9, the implementation of the remaining steps can refer to the process shown in Figure 9. In the process shown in Figure 11, the AMF can provide the first correspondence relationship to the MWAB-UE. Specifically, in step 904c, the third AMF obtains the first correspondence relationship from the OAM in PLMN#2. In step 905c, the third AMF sends the first correspondence relationship to the MWAB-UE.

[0316] It is understood that in order to implement the functions in the above embodiments, the network devices and terminal devices include hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily appreciate that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a manner driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0317] Figures 12 and 13 are schematic diagrams of the structures of possible communication devices provided in embodiments of the present application. These communication devices can be used to implement the functions of the mobile node, AMF, or SMF in the above-mentioned method embodiments, and thus can also achieve the beneficial effects of the above-mentioned method embodiments. In embodiments of the present application, the communication device can be the above-mentioned device or a module (such as a chip) in the above-mentioned device.

[0318] As shown in Figure 12, the communication device 1200 includes a processing unit 1210 and a transceiver unit 1220. The communication device 1200 is used to implement the functions of the mobile node or AMF in the method embodiment shown in any of Figures 7 to 11 above.

[0319] When the communication device 1200 is used to implement the function of the mobile node in the method embodiment shown in Figure 7: the processing unit 1210 is used to obtain first geographic location information, which indicates the current geographic location of the mobile node; based on the first geographic location information and the first correspondence, obtain the cell identifier and / or tracking area identifier corresponding to the first geographic location information; wherein the first correspondence includes the correspondence between the cell identifier and the geographic location information and / or the correspondence between the tracking area identifier and the geographic location information; and broadcast the cell identifier and / or tracking area identifier corresponding to the first geographic location information.

[0320] When the communication device 1200 is used to implement the function of AMF in the method embodiment shown in Figure 7: the processing unit 1210 is used to obtain second geographic location information, where the second geographic location information is the geographic location information corresponding to the cell where the mobile node resides, the third AMF is the AMF serving the mobile node, and the mobile node is used to provide wireless access services for the terminal device; based on the second geographic location information and the first correspondence, the cell identifier and / or tracking area identifier corresponding to the second geographic location information is determined, the first correspondence includes the correspondence between the cell identifier and the geographic location information and / or the correspondence between the tracking area identifier and the geographic location information; if the cell identifier corresponding to the second geographic location information is different from the cell identifier broadcast by the mobile node, the mobile node is instructed to update the broadcast cell identifier, or if the tracking area identifier corresponding to the second geographic location information is different from the tracking area identifier broadcast by the mobile node, the mobile node is instructed to update the broadcast tracking area identifier.

[0321] When the communication device 1200 is used to implement the function of the mobile node in the method embodiment shown in Figure 8: the processing unit 1210 is used to obtain second geographic location information, where the second geographic location information is the geographic location information corresponding to the cell where the mobile node resides; based on the first geographic location information and the first correspondence, the AMF identifier corresponding to the first geographic location information is obtained, and the first correspondence includes the correspondence between the AMF identifier and the geographic location information; if the AMF identifier indicates a second AMF, a first connection is established between the mobile node and the first AMF, and the second AMF is different from the first AMF, a connection establishment request message is sent to the second AMF through the transceiver unit 1220, and the connection establishment request message is used to request to establish a connection between the mobile node and the second AMF; wherein the first AMF is used to provide services for terminal devices accessing the mobile node.

[0322] When the communication device 1200 is used to implement the AMF function in the method embodiment shown in Figure 8: the processing unit 1210 is used to obtain second geographic location information, where the second geographic location information is the geographic location information corresponding to the cell where the mobile node resides, and the third AMF is the AMF serving the mobile node, and the mobile node is used to provide wireless access services for the terminal device; based on the second geographic location information and the first correspondence, the AMF identifier corresponding to the second geographic location information is determined, and the first correspondence includes the correspondence between the access and mobility management function AMF identifier and the geographic location information; if the AMF identifier corresponding to the second geographic location information is different from the identifier of the first AMF, the third AMF is used to instruct the mobile node to update the AMF through the transceiver unit 1220, and the first AMF is used to provide services for the terminal device accessing the mobile node.

[0323] A more detailed description of the processing unit 1210 and the transceiver unit 1220 can be directly obtained by referring to the relevant description in the method embodiment shown in the above drawings, and is not repeated here.

[0324] As shown in Figure 13, communication device 1300 includes a processor 1310 and an interface circuit 1320. Processor 1310 and interface circuit 1320 are coupled to each other. It is understood that interface circuit 1320 can be a transceiver or an input / output interface. Optionally, communication device 1300 may also include a memory 1330 for storing instructions executed by processor 1310, input data required by processor 1310 to execute instructions, or data generated by processor 1310 after executing instructions.

[0325] When the communication device 1300 is used to implement the method shown in the above figures, the processor 1310 is used to implement the functions of the above processing unit 1210, and the interface circuit 1320 is used to implement the functions of the above transceiver unit 1220.

[0326] When the communication device is a chip implemented in the device, the chip implements the functions of the corresponding device in the method embodiment. The chip receives information from other modules in the device (such as a radio frequency module or antenna), where the information is sent to the device by other modules; or the chip sends information to other modules in the device (such as a radio frequency module or antenna).

[0327] When the above-mentioned communication device is a module applied to a mobile node, the module implements the functions of the mobile node in the above-mentioned method embodiment. The module receives information from other modules (such as a radio frequency module or antenna), and the information is sent by the terminal to the device; or the module sends information to other modules in the device (such as a radio frequency module or antenna), and the information is sent by the device to the terminal. The module here can be the baseband chip of the device, or it can be a DU or other module. The DU here can be a DU under the open radio access network (O-RAN) architecture.

[0328] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0329] This application provides another example of a communication device, which includes at least one processor and at least one memory, the at least one processor and the at least one memory being coupled together, the at least one memory being used to store instructions. When the instructions are executed by the at least one processor, the communication device performs the method in the above-described embodiment. Taking a communication device including a processor and a memory as an example, as shown in FIG13 , a communication device 1300 includes a processor 1310 and a memory 1330. The processor 1310 and the memory 1330 are coupled together, and the memory 1330 stores instructions. When the instructions stored in the memory 1330 are executed by the processor 1310, the communication device 1300 performs the method performed by the terminal device or network device in the above-described embodiment.

[0330] It should be understood that the processor 1310 and the memory 1330 may also be integrated together, such as in one chip.

[0331] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal. The processor and storage medium can also exist in a network device or a terminal as discrete components.

[0332] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless 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 or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0333] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0334] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0335] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A mobility management method, characterized in that: Applied to a mobile node, the mobile node being used to provide a wireless access service for a terminal device, the method comprising: Acquire first geographical location information, where the first geographical location information indicates a current geographical location of the mobile node; Acquire, according to the first geographic location information and a first correspondence, a cell identifier and / or a tracking area identifier corresponding to the first geographic location information; wherein the first correspondence includes a correspondence between a cell identifier and geographic location information and / or a correspondence between a tracking area identifier and geographic location information; Broadcast the cell identifier and / or tracking area identifier corresponding to the first geographic location information.

2. The method according to claim 1, wherein The broadcasting of the cell identifier and / or tracking area identifier corresponding to the first geographical location information includes: If the cell identifier corresponding to the first geographic location information is different from the cell identifier broadcast by the mobile node, updating the cell identifier broadcast by the mobile node according to the cell identifier corresponding to the first geographic location information; and / or, If the tracking area identifier corresponding to the first geographic location information is different from the tracking area identifier broadcast by the mobile node, the tracking area identifier broadcast by the mobile node is updated according to the tracking area identifier corresponding to the first geographic location information.

3. The method according to claim 1, wherein Also includes: A first message is sent to a first access and mobility management function AMF, where the first message includes a cell identifier and / or tracking area identifier corresponding to the first geographic location information. The first message is used to request an update of the configuration information of the mobile node, and the first AMF is used to provide services for terminal devices accessing the mobile node.

4. The method according to any one of claims 1 to 3, wherein The first correspondence further includes a correspondence between the AMF identifier and the geographic location information. The method further includes: Obtaining, according to the first geographic location information and the first correspondence, an AMF identifier corresponding to the first geographic location information; If the AMF identifier indicates a second AMF, a first connection is established between the mobile node and the first AMF, and the second AMF is different from the first AMF, a connection establishment request message is sent to the second AMF, where the connection establishment request message is used to request establishment of a connection between the mobile node and the second AMF; wherein the first AMF is used to provide services for the terminal device accessing the mobile node.

5. The method according to claim 4, wherein Also includes: Send a connection release request message to the first AMF, where the connection release request message is used to request to release the connection between the mobile node and the first AMF.

6. The method according to any one of claims 1 to 5, wherein: Also includes: Acquire the first corresponding relationship from a first network element, where the first network element is used to store the first corresponding relationship; or, The first correspondence is obtained from a third AMF, where the third AMF is the AMF serving the mobile node.

7. The method according to claim 6, wherein After acquiring the first corresponding relationship from the first network element, the method further includes: Send the first correspondence to the third AMF.

8. The method according to any one of claims 6 to 7, wherein: Also includes: receiving address information of the first network element, where the address information of the first network element comes from a second network element in the network where the mobile node is registered; The acquiring the first corresponding relationship from the first network element includes: The first corresponding relationship is acquired from the first network element according to the address information of the first network element.

9. The method according to any one of claims 1 to 8, wherein The obtaining of the first geographical location information includes: receiving notification information from a third AMF, where the notification information instructs the mobile node to update a broadcast cell identifier and / or tracking area identifier, and the third AMF is the AMF serving the mobile node; The first geographic location information is acquired according to the notification information.

10. The method according to any one of claims 1 to 8, wherein The obtaining of the first geographical location information includes: The first geographical location information is obtained according to a periodically initiated positioning process for the mobile node.

11. A mobility management method, characterized in that: include: The third access and mobility management function AMF obtains second geographical location information, where the second geographical location information is geographical location information corresponding to the cell where the mobile node resides. The third AMF is the AMF serving the mobile node, and the mobile node is used to provide a wireless access service for the terminal device. The third AMF determines, based on the second geographic location information and the first correspondence, a cell identifier and / or a tracking area identifier corresponding to the second geographic location information, where the first correspondence includes a correspondence between the cell identifier and the geographic location information and / or a correspondence between the tracking area identifier and the geographic location information; If the cell identifier corresponding to the second geographic location information is different from the cell identifier broadcast by the mobile node, the mobile node is instructed to update the broadcast cell identifier; or, if the tracking area identifier corresponding to the second geographic location information is different from the tracking area identifier broadcast by the mobile node, the mobile node is instructed to update the broadcast tracking area identifier.

12. The method according to claim 11, wherein The first correspondence further includes a correspondence between the AMF identifier and the geographic location information. The method further includes: The third AMF determines, based on the second geographic location information and the first correspondence, an AMF identifier corresponding to the second geographic location information; If the AMF identifier corresponding to the second geographic location information is different from the identifier of the first AMF, the third AMF instructs the mobile node to update the AMF, and the first AMF is used to provide services for the terminal device accessing the mobile node.

13. The method according to any one of claims 11 to 12, wherein: The third AMF obtains the second geographic location information, including: The third AMF obtains an identifier of the cell where the mobile node resides from a first radio access network device, where the first radio access network device is a radio access network device serving the mobile node; The third AMF determines the geographic location information corresponding to the identifier of the cell in which the mobile node resides.

14. The method according to any one of claims 11 to 13, wherein: Also includes: The third AMF obtains the first correspondence from the mobile node.

15. The method according to any one of claims 11 to 13, wherein: Also includes: The third AMF sends the first correspondence to the mobile node; or The third AMF sends the address information of the first network element to the mobile node, where the first network element is used to store the first corresponding relationship.

16. A mobility management method, characterized in that: Applied to a mobile node, the mobile node being used to provide a wireless access service for a terminal device, the method comprising: Acquire first geographical location information, where the first geographical location information indicates a current geographical location of the mobile node; Obtain, according to the first geographic location information and the first correspondence, an access and mobility management AMF identifier corresponding to the first geographic location information; wherein the first correspondence includes a correspondence between the AMF identifier and the geographic location information; If the AMF identifier indicates a second AMF, a first connection is established between the mobile node and the first AMF, and the second AMF is different from the first AMF, a connection establishment request message is sent to the second AMF, where the connection establishment request message is used to request establishment of a connection between the mobile node and the second AMF; wherein the first AMF is used to provide services for the terminal device accessing the mobile node.

17. The method according to claim 16, wherein Also includes: Send a connection release request message to the first AMF, where the connection release request message is used to request to release the connection between the mobile node and the first AMF.

18. The method according to any one of claims 16 to 17, wherein: Also includes: Acquire the first corresponding relationship from a first network element, where the first network element is used to store the first corresponding relationship; or, The first correspondence is obtained from a third AMF, where the third AMF is the AMF serving the mobile node.

19. The method according to claim 18, wherein After acquiring the first corresponding relationship from the first network element, the method further includes: Send the first correspondence to the third AMF.

20. The method according to any one of claims 18 to 19, wherein: Also includes: receiving address information of the first network element, where the address information of the first network element comes from a second network element in the network where the mobile node is registered; The acquiring the first corresponding relationship from the first network element includes: The first corresponding relationship is acquired from the first network element according to the address information of the first network element.

21. The method according to any one of claims 16 to 20, wherein: The obtaining of the first geographical location information includes: receiving notification information from a third AMF, where the notification information instructs the mobile node to update the AMF, where the third AMF is the AMF serving the mobile node; The first geographic location information is acquired according to the notification information.

22. The method according to any one of claims 16 to 21, wherein: The obtaining of the first geographical location information includes: The first geographical location information is obtained according to a periodically initiated positioning process for the mobile node.

23. A mobility management method, characterized in that: include: The third access and mobility management function AMF obtains second geographical location information, where the second geographical location information is geographical location information corresponding to the cell where the mobile node resides. The third AMF is the AMF serving the mobile node, and the mobile node is used to provide a wireless access service for the terminal device. The third AMF determines, based on the second geographical location information and the first correspondence, an AMF identifier corresponding to the second geographical location information, where the first correspondence includes a correspondence between an access and mobility management function AMF identifier and the geographical location information; If the AMF identifier corresponding to the second geographic location information is different from the identifier of the first AMF, the third AMF instructs the mobile node to update the AMF, and the first AMF is used to provide services for the terminal device accessing the mobile node.

24. The method according to claim 23, wherein The third AMF obtains the second geographic location information, including: The third AMF obtains an identifier of the cell where the mobile node resides from a first radio access network device, where the first radio access network device is a radio access network device serving the mobile node; The third AMF determines the geographic location information corresponding to the identifier of the cell in which the mobile node resides.

25. The method according to any one of claims 23 to 24, wherein: Also includes: The third AMF obtains the first correspondence from the mobile node.

26. The method according to any one of claims 23 to 24, wherein: Also includes: The third AMF sends the first correspondence to the mobile node; or The third AMF sends the address information of the first network element to the mobile node, where the first network element is used to store the first corresponding relationship.

27. A communication system, characterized in that: The mobile node comprises a mobile node and an access and mobility management function AMF, wherein the mobile node is used to implement the method according to any one of claims 1 to 10, and the AMF is used to implement the method according to any one of claims 11 to 15; or, the mobile node is used to implement the method according to any one of claims 16 to 22, and the AMF is used to implement the method according to any one of claims 23 to 26.

28. A communication device, characterized in that: The method comprises a unit or module for executing the method according to any one of claims 1 to 10, or a unit or module for executing the method according to any one of claims 11 to 15, or a unit or module for executing the method according to any one of claims 16 to 22, or a unit or module for executing the method according to any one of claims 23 to 26.

29. A communication device, characterized in that: include: The one or more processors are configured to perform the method of any one of claims 1-10, or the method of any one of claims 11-15, or the method of any one of claims 16-22, or the method of any one of claims 23-26.

30. A readable storage medium, characterized in that The readable storage medium stores a program, and when the program is executed by the communication device, it implements the method according to any one of claims 1 to 10, or the method according to any one of claims 11 to 15, or the method according to any one of claims 16 to 22, or the method according to any one of claims 23 to 26.

31. A chip system, characterized in that: include: a memory for storing computer programs; a processor; When the processor calls and runs the computer program from the memory, the communication device equipped with the chip system executes the method as described in any one of claims 1 to 10, or executes the method as described in any one of claims 11 to 15, or executes the method as described in any one of claims 16 to 22, or executes the method as described in any one of claims 23 to 26.

32. A computer program product, characterized in that The computer program product includes instructions, which, when executed on a processor, cause the processor to execute the method described in any one of claims 1 to 10, or the method described in any one of claims 11 to 15, or the method described in any one of claims 16 to 22, or the method described in any one of claims 23 to 26.

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