WO2021043178A1 - Roaming control method and apparatus, udm device, and storage medium - Google Patents

Abstract

The present disclosure provides a roaming control method and apparatus, a UDM device, and a storage medium. The method comprises: a first communication node receiving a first message sent by a second communication node, the first message comprising a public land mobile network identifier (PLMN ID); and the first communication node matching a roaming control solution to a terminal device according to the PLMN ID and a roaming template to which the terminal device has subscribed.

Description

A roaming control method, device, UDM equipment and storage medium Technical field

This application relates to a wireless communication network, such as a roaming control method and device, a unified data management (UDM) device and a storage medium.

Background technique

Roaming refers to the function that the mobile communication system can still provide services to a mobile station after it leaves its registered service area and moves to another service area. However, currently in the fifth-generation mobile communication network (5th-Generation, 5G), there is no clear provision for detecting the roaming control method of the terminal device.

Summary of the invention

This application provides a roaming control method, device, UDM device, and storage medium, which can perform roaming control on a terminal device based on a roaming template signed by the terminal device to adapt to various use scenarios of the terminal device.

An embodiment of the present application provides a roaming control method, including: a first communication node receives a first message sent by a second communication node, the first message includes a public land mobile network identifier PLMNID;

The first communication node matches the roaming control scheme for the terminal device according to the PLMNID and the roaming template signed by the terminal device.

An embodiment of the present application provides a roaming control device, including: a receiving module and a processing module;

The receiving module is configured to receive the first message sent by the second communication node, the first message includes the public land mobile network identification PLMNID; the processing module is configured to match the roaming control scheme for the terminal device according to the PLMNID and the roaming template contracted by the terminal device.

The embodiment of the present application provides a unified data management UDM device, which includes a processor, and the processor is configured to implement the method of any of the foregoing embodiments when a computer program is executed.

The embodiment of the present application also provides a computer-readable storage medium storing a computer program, and the computer program is executed by a processor to implement the method of any of the foregoing embodiments.

With regard to the above embodiments and other aspects of the present application and their implementation manners, more descriptions are provided in the description of the drawings, specific implementation manners, and claims.

Description of the drawings

FIG. 1 is a schematic flowchart of a roaming control method provided by an embodiment;

2 is a schematic flowchart of another roaming control method provided by an embodiment;

FIG. 3 is a schematic flowchart of another roaming control method provided by an embodiment;

Figure 4 is a schematic structural diagram of a roaming control device provided by an embodiment;

FIG. 5 is a schematic structural diagram of another roaming control device provided by an embodiment;

Fig. 6 is a schematic structural diagram of a UDM device provided by an embodiment.

detailed description

Hereinafter, the embodiments of the present application will be described in detail with reference to the accompanying drawings.

Roaming refers to the function that the mobile communication system can still provide services to a mobile station after it leaves its registered service area and moves to another service area. For 5G roaming control, there is a small amount of description in the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) Technical Specification (TS) 29503: Section 5.3.2.2.2 Core Access and Mobility Management Functions (Core Access and Mobility) Management Function, AMF) 3GPP access registration explains that if roaming restriction is checked, it will return "403Forbidden", but it does not specifically describe how to detect whether the terminal device should be roaming restriction during this registration. In addition, in the authentication information query, AMF non-3GPP access registration, session management function (Session Management Function, SMF) access registration, session management storage network function (Session Management Storage network function, SMSF) 3GPP access registration, SMSF non-3GPP access registration, Roaming restrictions need to be checked during 3GPP access registration and other processes.

The embodiments of the application provide a mobile communication network (including but not limited to the fifth-generation mobile communication network (5th-Generation, 5G)). The network architecture of the network may include core network equipment (such as UDM equipment) and network side equipment. (For example, one or more types of base stations, transmission nodes, access nodes (AP, Access Point), relays, Node B (Node B, NB), Terrestrial Radio Access (UTRA, Universal Terrestrial Radio Access), evolution Type terrestrial radio access (EUTRA, Evolved Universal Terrestrial Radio Access, etc.) and terminal equipment (User Equipment (UE), user equipment data card, relay, mobile equipment, etc.). In the embodiment of this application, a roaming control method, device, UDM device, and storage medium that can run on the above-mentioned network architecture are provided, which can perform roaming control on terminal equipment based on the roaming template signed by the terminal equipment, so as to adapt to various terminal equipment. Kind of usage scenarios. The operating environment of the aforementioned roaming control method provided in the embodiments of the present application is not limited to the aforementioned network architecture.

The terms "system" and "network" in this application are often used interchangeably in this application. The terms "first", "second", "third", etc. in the specification, claims, and drawings of this application are used to distinguish different objects, rather than to limit a specific order. The following embodiments of the present application can be executed individually, and the various embodiments can also be implemented in combination with each other, which is not specifically limited by the embodiments of the present application.

The following describes the roaming control method, device and its technical effects.

FIG. 1 is a schematic flowchart of a roaming control method provided by an embodiment. As shown in FIG. 1, the method provided in this embodiment is applicable to core network equipment (such as UDM equipment), and the method includes the following steps.

S110. The first communication node receives a first message sent by the second communication node, where the first message includes a Public Land Mobile Network Identity (PLMNID).

The first message is a message initiated by the terminal device and sent to the second communication node. After receiving the first message sent by the terminal device, the second communication node forwards the first message to the first communication node.

S120: The first communication node matches the roaming control scheme for the terminal device according to the PLMNID and the roaming template signed by the terminal device.

A terminal device can sign a roaming template at the same time. Each roaming template includes at least two roaming sub-templates. Different roaming sub-templates support different granularities of roaming control. The granularity of roaming control can be at least divided into network level and network function ( Network Function (NF) level.

In an embodiment, the network level may be applicable to AMF 3GPP access registration, AMF non-3GPP access registration, authentication information query, SMF access registration, SMSF 3GPP access registration, SMSF non-3GPP access registration and other processes; NF The level can be applied to processes such as AMF 3GPP access registration and AMF non-3GPP access registration.

Exemplarily, FIG. 2 is a schematic flowchart of another roaming control method provided by an embodiment. As shown in FIG. 2, the method provided in this embodiment uses the first communication node as the UDM device and the second communication node as the authentication server. A function (Authentication Server Function, AUSF) device is described as an example. The method provided in this embodiment is applicable to the authentication process of AUSF, and the method includes the following steps.

S210. The UDM device receives the authentication request message sent by the AUSF device, where the authentication request message includes the PLMNID.

In an embodiment, the authentication request message is initiated by the terminal device and sent to the AUSF device. After receiving the authentication request message sent by the terminal device, the AUSF device forwards the authentication request message to the UDM device.

The authentication request message usually does not directly carry the PLMNID field, but includes it in the ServingNetworkName field. According to the 29503 agreement, Chapter A.4 Nudm_UEAU API definition:

ServingNetworkName:

type:string

pattern:'^5G:mnc[0-9]{3}[.]mcc[0-9]{3}[.]3gppnetwork[.]org$'.

Therefore, the UDM device can parse out the mobile device country code (Mobile Country Code, MCC) and the mobile device network code (Mobile Network Code, MNC), and then obtain the PLMNID.

S220. The UDM device confirms, according to the PLMNID, whether the second roaming sub-template includes a roaming control scheme that matches the terminal device.

The terminal device can sign a roaming template at the same time. It is assumed that the template identifier of the roaming template subscribed by the terminal device at the current moment is 1. The roaming template may include a first roaming sub-template and a second roaming sub-template, and the roaming template is suitable for network-level roaming control granularity. The first roaming sub-template may be as shown in Table 1 below, and the second roaming sub-template may be as shown in Table 2 below.

Table 1

Template ID	DEFTRULE
1	RESTRICT (restricted)

The first roaming sub-template shown in Table 1 may generally be a default rule for roaming control.

Table 2

Serial number	Template ID	PLMNID	RULE
1	1	46001	RESTRICT (restricted)
2	1	46003	PERMISSION (allowed)

The second roaming sub-template shown in Table 2 can generally support network-level roaming control granularity.

For the AUSF authentication process, the UDM device can first match in the second roaming sub-template. If the match is successful, it will be processed according to the RULE in the matching record; if the match fails, it will be processed according to the default rule of the first roaming sub-template.

S230: If the second roaming sub-template includes a roaming control solution matching the terminal device, the UDM device selects the roaming control solution.

S240: If the second roaming sub-template does not include a roaming control plan that matches the terminal device, the UDM device selects the roaming control plan of the first roaming sub-template.

If the authentication request message initiated by the terminal device comes from a network with a PLMNID of 46001, refer to Table 2, and the UDM device selects the rule RESTRICT whose sequence number is 1;

If the authentication request message initiated by the terminal device comes from a network with a PLMNID of 46003, refer to Table 2, and the UDM device selects the rule PERMISSION with a sequence number of 2;

If the authentication request message initiated by the terminal device comes from a network with a PLMNID of 46002, refer to Table 2. At this time, Table 2 does not include a roaming control scheme that matches the terminal device, and the UDM device selects the default rule RESTRICT specified in Table 1.

As another example, FIG. 3 is a schematic flowchart of another roaming control method provided by an embodiment. As shown in FIG. 3, the method provided in this embodiment uses the first communication node as the UDM device and the second communication node as the AMF. The device is described as an example. The method provided in this embodiment is applicable to the registration process of AMF, and the method includes the following steps.

S310. The UDM device receives the registration request message sent by the AMF device. The registration request message includes Globally Unique AMF Identifier (GUAMI) information. The GUAMI information includes PLMNID and core access and mobility management function identifiers. (Core Access and Mobility Management Function Identity, AMFID).

In an embodiment, the registration request message may be a 3GPP access registration request message or a non-3GPP access registration request message, which is not specifically limited in the embodiment of the present application. The registration request message is initiated by the terminal device and sent to the AMF device. After receiving the registration request message sent by the terminal device, the AMF device forwards the registration request message to the UDM device.

In an embodiment, the AMFID includes core access and mobility management function area identification (AMF area ID (8 bits)), core access and mobility management function set identification (AMF set ID (10 bits)), and core access and Movement management function pointer (AMF pointer (6 bits)). AMFID is a string, as specified in sub-clause 2.10.1 of 3GPP TS 23.003 [7]. AMFID is encoded as a string of 6 hexadecimal characters (ie, 24 digits), with the pattern:'^[A-Fa-f0-9]{6}$'. For example, in the GUAMI information, PLMNID=46003, AMFID=0a0282, the UDM device can parse according to AMFID=0a0282, and obtain AMFRegion=10, AMFSet=2.

S320. The UDM device confirms whether the third roaming sub-template includes a roaming control scheme matching the terminal device according to the PLMNID and AMFID.

The terminal device can sign a roaming template at the same time. It is assumed that the template identifier of the roaming template subscribed by the terminal device at the current moment is 1. The roaming template includes a first roaming sub-template, a second roaming sub-template, and a third roaming sub-template. The roaming template is suitable for NF-level roaming control granularity. The first roaming sub-template may be shown in Table 3 below, the second roaming sub-template may be shown in Table 4 below, and the third roaming sub-template may be shown in Table 5 below.

table 3

Template ID	DEFTRULE
1	RESTRICT (restricted)

The first roaming sub-template shown in Table 3 may generally be a default rule for roaming control.

Table 4

Serial number	Template ID	PLMNID	RULE
1	1	46001	RESTRICT (restricted)
2	1	46003	PERMISSION (allowed)

The second roaming sub-template shown in Table 4 can generally support network-level roaming control granularity.

table 5

The third roaming sub-template shown in Table 5 can generally support network-level and NF-level roaming control granularity.

For the registration process of AMF, the UDM device can first match in the third roaming sub-template. If the match is successful, it will be processed according to the RULE in the matching record; if the match fails, it will be matched in the second roaming sub-template, and the match is successful If the match is unsuccessful, it will be processed according to the default rule of the first roaming sub-template.

S330: If the third roaming sub-template includes a roaming control solution matching the terminal device, the UDM device selects the roaming control solution.

S340. If the third roaming sub-template does not include a roaming control solution matching the terminal device, the UDM device confirms whether the second roaming sub-template includes a roaming control solution matching the terminal device according to the PLMNID and AMFID.

S350. If the second roaming sub-template includes a roaming control solution matching the terminal device, the UDM device selects the roaming control solution.

S360: If the second roaming sub-template does not include a roaming control solution matching the terminal device, the UDM device selects the roaming control solution of the first roaming sub-template.

If the registration request message initiated by the terminal device comes from a network with a PLMNID of 46002, and the AMFRegion is 10, and the AMFSet is 2, refer to Table 5, and the UDM device selects the rule RESTRICT with the sequence number 4;

If the registration request message initiated by the terminal device is from a network with a PLMNID of 46003, and AMFRegion is 10 and AMFSet is 2, refer to Table 5. At this time, Table 5 does not include a roaming control scheme that matches the terminal device. Continue to refer to Table 4. For UDM equipment, select the rule PERMISSION with sequence number 2;

If the registration request message initiated by the terminal device comes from a network with PLMNID 46002, and AMFRegion is 13, AMFSet is 3, refer to Table 5, and the UDM device selects the rule RESTRICT with sequence number 5;

If the registration request message initiated by the terminal device comes from a network with a PLMNID of 46001, and AMFRegion is 255, and AMFSet is 1023, refer to Table 5, and the UDM device selects the rule PERMISSION with sequence number 3;

If the registration request message initiated by the terminal device comes from a network with a PLMNID of 46004, and AMFRegion is 255 and AMFSet is 1023, refer to Table 5. At this time, Table 5 does not include a roaming control scheme that matches the terminal device. Continue to refer to Table 4. At this time, Table 4 also does not include a roaming control scheme matching the terminal device, and the UDM device selects the default rule RESTRICT specified in Table 3.

On the basis of the foregoing embodiment, the method for changing the roaming template scenario for the terminal device may further include the following steps.

S370. After the terminal device changes the roaming template, the UDM device sends a de-registration request message to the AMF device.

In one embodiment, the DeregistrationReason field in the deregistration request message is filled in as "REREGISTRATION_REQUIRED" to request the AMF device to re-initiate the registration process.

S380. The UDM device receives a re-registration request message sent by the AMF device, where the re-registration request message includes GUAMI information, and the GUAMI information includes PLMNID and AMFID.

After the UDM device receives the re-registration request message sent by the AMF device, the UDM device re-matches the roaming control scheme for the terminal device.

The embodiment of the application provides a roaming control method, including: a first communication node receives a first message sent by a second communication node, the first message includes a public land mobile network identification PLMNID; the first communication node signs a contract with a terminal device based on the PLMNID The roaming template matches the roaming control plan for the terminal device. This application can perform roaming control on the terminal device based on the roaming template signed by the terminal device to adapt to various usage scenarios of the terminal device.

FIG. 4 is a schematic structural diagram of a roaming control device provided by an embodiment. The roaming control device may be configured in a first communication node. As shown in FIG. 4, it includes: a receiving module 10 and a processing module 11.

The receiving module 10 is configured to receive a first message sent by a second communication node, where the first message includes a public land mobile network identification PLMNID;

The processing module 11 is configured to match the roaming control scheme for the terminal device according to the roaming template signed by the PLMNID and the terminal device.

The roaming control device provided in this embodiment implements the roaming control method of the foregoing embodiment. The implementation principles and technical effects of the roaming control device provided in this embodiment are similar, and will not be repeated here.

In an embodiment, the receiving module 10 is configured to receive an authentication request message sent by the second communication node, and the authentication request message includes a PLMNID.

In an embodiment, the roaming template includes a first roaming sub-template and a second roaming sub-template;

The processing module 11 is configured to confirm, according to the PLMNID, that the second roaming sub-template includes a roaming control plan that matches the terminal device; or, according to the PLMNID, confirm that the second roaming sub-template does not include a roaming control plan that matches the terminal device; Select the roaming control scheme of the first roaming sub-template.

In one embodiment, the receiving module 10 is configured to receive a registration request message sent by the second communication node. The registration request message includes the globally unique core access and mobility management function identifier GUAMI information. The GUAMI information includes PLMNID and core access and The mobile management function identifier AMFID.

In an embodiment, the roaming template includes a first roaming sub-template, a second roaming sub-template, and a third roaming sub-template;

The processing module 11 is configured to confirm that the third roaming sub-template includes a roaming control scheme that matches the terminal device according to the PLMNID and AMFID; or, according to the PLMNID and AMFID, confirm that the third roaming sub-template does not include the third roaming sub-template that matches the terminal device Roaming control plan; confirm that the second roaming sub-template includes a roaming control plan that matches the terminal device; or, based on the PLMNID and AMFID, confirm that neither the third roaming sub-template nor the second roaming sub-template includes roaming that matches the terminal device Control plan; select the roaming control plan of the first roaming sub-template.

In an embodiment, in conjunction with FIG. 4, FIG. 5 is a schematic structural diagram of another roaming control apparatus provided by an embodiment, and further includes: a sending module 12.

The sending module is configured to send a de-registration request message to the second communication node after the terminal device changes the roaming template;

The receiving module 10 is further configured to receive a re-registration request message sent by the second communication node, the re-registration request message includes GUAMI information, and the GUAMI information includes PLMNID and AMFID.

In an embodiment, the AMFID includes a core access and mobility management function area identifier, a core access and mobility management function set identifier, and a core access and mobility management function pointer.

An embodiment of the present application also provides a UDM device, including a processor, and the processor is configured to implement the method provided in any embodiment of the present application when the computer program is executed. FIG. 6 is a schematic structural diagram of a UDM device provided by an embodiment. As shown in FIG. 6, the UDM device includes a processor 60, a memory 61, and a communication interface 62; the number of processors 60 in the UDM device may be one or more One, a processor 60 is taken as an example in FIG. 6; the processor 60, the memory 61, and the communication interface 62 in the UDM device can be connected by a bus or in other ways. In FIG. 6, a bus connection is taken as an example. The bus represents one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any bus structure among multiple bus structures.

As a computer-readable storage medium, the memory 61 can be configured to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the methods in the embodiments of the present application. The processor 60 executes at least one functional application and data processing of the UDM device by running the software programs, instructions, and modules stored in the memory 61, that is, realizes the aforementioned roaming control method.

The memory 61 may include a program storage area and a data storage area, where the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal device, and the like. In addition, the memory 61 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some examples, the memory 61 may include a memory remotely provided with respect to the processor 60, and these remote memories may be connected to the UDM device through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

The communication interface 62 can be configured to receive and send data.

The embodiments of the present application also provide a computer-readable storage medium, and the computer-readable storage medium stores a computer program, and the computer program implements the method provided in any embodiment of the present application when the computer program is executed by a processor.

The computer storage media in the embodiments of the present application may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or a combination of any of the above. Computer-readable storage media include (non-exhaustive list): electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (Read-Only Memory) , ROM), electrically erasable, programmable Read-Only Memory (EPROM), flash memory, optical fiber, compact Disc Read-Only Memory (CD-ROM), optical storage Components, magnetic storage devices, or any suitable combination of the above. In this application, a computer-readable storage medium may be any tangible medium that contains or stores a program, and the program may be used by or in combination with an instruction execution system, apparatus, or device.

The computer-readable signal medium may include a data signal propagated in baseband or as a part of a carrier wave, and the computer-readable program code is carried in the data signal. This propagated data signal can take many forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. The computer-readable signal medium may also be any computer-readable medium other than the computer-readable storage medium. The computer-readable medium may send, propagate, or transmit the program for use by or in combination with the instruction execution system, apparatus, or device .

The program code contained on the computer-readable medium can be transmitted by any suitable medium, including—but not limited to wireless, wire, optical cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

The computer program code used to perform the operations of the present disclosure can be written in one or more programming languages or a combination of multiple programming languages. The programming languages include object-oriented programming languages-such as Java, Smalltalk, C++, Ruby, Go, also includes conventional procedural programming languages-such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partly on the user's computer, executed as an independent software package, partly on the user's computer and partly executed on a remote computer, or entirely executed on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any kind of network-including Local Area Network (LAN) or Wide Area Network (WAN)-or it can be connected to an external computer ( For example, use an Internet service provider to connect via the Internet).

Those skilled in the art should understand that the term user terminal encompasses any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser, or a vehicle-mounted mobile station.

In general, the various embodiments of the present application can be implemented in hardware or dedicated circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that may be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.

The embodiments of the present application may be implemented by executing computer program instructions by a data processor of a mobile device, for example, in a processor entity, or by hardware, or by a combination of software and hardware. Computer program instructions can be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or written in any combination of one or more programming languages Source code or object code.

The block diagram of any logic flow in the drawings of the present application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program can be stored on the memory. The memory can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as but not limited to read only memory (ROM), random access memory (RAM), optical storage devices and systems (digital multi-function optical discs) DVD or CD) etc. Computer-readable media may include non-transitory storage media. The data processor can be any type suitable for the local technical environment, such as but not limited to general-purpose computers, special-purpose computers, microprocessors, digital signal processors (Digital Signal Processing, DSP), application specific integrated circuits (ASICs) ), programmable logic devices (Field-Programmable Gate Array, FGPA), and processors based on multi-core processor architecture.

Claims (10)

1. A roaming control method, including:

   The first communication node receives a first message sent by the second communication node, where the first message includes a public land mobile network identification PLMNID;

   The first communication node matches the roaming control scheme for the terminal device according to the PLMNID and the roaming template subscribed by the terminal device.
2. The method according to claim 1, wherein the first communication node receiving the first message sent by the second communication node comprises:

   The first communication node receives an authentication request message sent by the second communication node, where the authentication request message includes the PLMNID.
3. The method according to claim 2, wherein the roaming template includes a first roaming sub-template and a second roaming sub-template;

   The first communication node matching the roaming control scheme for the terminal device according to the PLMNID and the roaming template contracted by the terminal device includes:

   According to the PLMNID, the first communication node confirms that the second roaming sub-template includes a roaming control scheme that matches the terminal device; or,

   According to the PLMNID, the first communication node confirms that the second roaming sub-template does not include a roaming control scheme that matches the terminal device; the first communication node selects the roaming control of the first roaming sub-template Program.
4. The method according to claim 1, wherein the first communication node receiving the first message sent by the second communication node comprises:

   The first communication node receives a registration request message sent by the second communication node, the registration request message includes globally unique core access and mobility management function identification GUAMI information, and the GUAMI information includes the PLMNID and core access And mobile management function identification AMFID.
5. The method according to claim 4, wherein the touring template includes a first touring sub-template, a second touring sub-template, and a third touring sub-template;

   The first communication node matching the roaming control scheme for the terminal device according to the PLMNID and the roaming template contracted by the terminal device includes:

   According to the PLMNID and the AMFID, the first communication node confirms that the third roaming sub-template includes a roaming control scheme that matches the terminal device; or,

   According to the PLMNID and the AMFID, the first communication node confirms that the third roaming sub-template does not include a roaming control scheme that matches the terminal device; the first communication node confirms that the second roaming sub-template The template includes a roaming control scheme matching the terminal device; or,

   According to the PLMNID and the AMFID, the first communication node confirms that neither the third roaming sub-template nor the second roaming sub-template includes a roaming control scheme that matches the terminal device; the first The communication node selects the roaming control scheme of the first roaming sub-template.
6. The method according to claim 4, further comprising:

   After the terminal device changes the roaming template, the first communication node sends a de-registration request message to the second communication node;

   The first communication node receives a re-registration request message sent by the second communication node, where the re-registration request message includes GUAMI information, and the GUAMI information includes the PLMNID and the AMFID.
7. The method according to claim 4, wherein the AMFID includes a core access and mobility management function area identifier, a core access and mobility management function set identifier, and a core access and mobility management function pointer.
8. A roaming control device includes: a receiving module and a processing module;

   The receiving module is configured to receive a first message sent by a second communication node, where the first message includes a public land mobile network identification PLMNID;

   The processing module is configured to match a roaming control scheme for the terminal device according to the PLMNID and the roaming template contracted by the terminal device.
9. A unified data management UDM device, comprising: a processor configured to implement the roaming control method according to any one of claims 1 to 7 when a computer program is executed.
10. A computer-readable storage medium that stores a computer program, which, when executed by a processor, implements the roaming control method according to any one of claims 1 to 7.

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