Access management device, access management method, program, maintenance device, maintenance method, system, and method

Abstract

The purpose of the present disclosure is to enable an access management device to be appropriately operated even when an abnormality occurs therein. Provided is an access management device comprising: an acquisition unit that acquires information indicating a specific access management device; a registration unit that registers a notification request indicating that the specific access management device has been started; and a control unit that, when an abnormality has occurred in the access management device and the specific access management device has been started, transmits, to a terminal registered in the access management device, information for registering the terminal to the specific access management device.

Description

Access Management Device, Access Management Method, Program, Maintenance Device, Maintenance Method, System, and Method

[0001] The present disclosure relates to an access management device, an access management method, a program, a maintenance device, a maintenance method, a system, and a method.

[0002] Patent Document 1 discloses transmitting information indicating identifiers (IDs) of one or more backup entities for one or more contexts in an NF to other NFs. Also, to handle planned maintenance and failures, the AMF may optionally provide backup AMF information, that is, the AMF may act as a backup AMF when the AMF associated with the indicated GUAMI is unavailable.

[0003] Japanese Patent Translation Publication No. 2023-547880

[0004] However, in the technology described in Patent Document 1, for example, when an abnormality such as congestion occurs in an access management device (such as an AMF), it may not be possible to operate properly.

[0005] An object of the present disclosure is to provide a technology that can be properly operated even when an abnormality occurs in an access management device in view of the above problems.

[0006] In a first aspect according to the present disclosure, there is provided an access management device including: an acquisition unit that acquires information indicating a specific access management device; a registration unit that registers a notification request for activation of the specific access management device; and a control unit that, when an abnormality occurs in the access management device and the specific access management device is activated, transmits information for registering terminals registered in the access management device to the specific access management device to the terminals.

[0007] Furthermore, in a second aspect relating to this disclosure, an access management method is provided in which an access management device acquires information indicating a specific access management device, registers a notification request that the specific access management device has been activated, and, if an abnormality occurs in the access management device and the specific access management device is activated, transmits information to the terminals to cause them to register the terminals registered with the access management device with the specific access management device.

[0008] Furthermore, in a third aspect relating to this disclosure, a program is provided that causes an access management device to perform the following actions: acquire information indicating a specific access management device; register a notification request that the specific access management device has been activated; and, if an abnormality occurs in the access management device and the specific access management device is activated, send information to the terminals to cause them to register the terminals registered with the access management device with the specific access management device.

[0009] Furthermore, in a fourth aspect relating to this disclosure, a maintenance device is provided that includes a transmission unit that transmits information to an access management device indicating a specific access management device for which terminals registered with the access management device are to be registered when an abnormality occurs in the access management device, and a startup unit that starts the specific access management device when an abnormality occurs in the access management device.

[0010] From one perspective, it can be operated properly even if a malfunction occurs in the access control device.

[0011] This figure shows an example of the configuration of an access management device according to the embodiment. This figure shows an example of the configuration of a communication system according to the embodiment. This figure shows an example of the hardware configuration of an access management device according to the embodiment. This is a sequence diagram showing an example of the processing of a communication system according to the embodiment. This figure shows an example of information recorded in the user terminal DB according to the embodiment. This figure shows an example of information recorded in the transfer setting DB according to the embodiment.

[0012] The principles of this disclosure will be described with reference to several exemplary embodiments. These embodiments are described for illustrative purposes only and should be understood as helping those skilled in the art to understand and implement this disclosure without implying any limitation on the scope of this disclosure. The disclosures described herein may be implemented in various ways other than those described below.

[0013] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which this disclosure belongs.

[0014] Embodiments of the present disclosure will be described below with reference to the drawings. Each drawing is merely illustrative for illustrating one or more embodiments. Each drawing may be associated not only with one specific embodiment but also with one or more other embodiments. As those skilled in the art will understand, various features or steps described with reference to any one drawing can be combined with features or steps shown in one or more other drawings, for example, to create embodiments not explicitly shown or described. Not all features or steps shown in any one drawing are necessarily required to illustrate an exemplary embodiment, and some features or steps may be omitted. The order of steps described in any of the drawings may be changed as appropriate.

[0015] (Embodiment 1) <Configuration> Referring to Figure 1, the configuration of the access management device 10 and maintenance device 50 according to the embodiment will be described. Figure 1 is a diagram showing an example of the configuration of the access management device 10 and maintenance device 50 according to the embodiment. In the example of Figure 1, the access management device 10 has an acquisition unit 11, a registration unit 12, and a control unit 13. Each of these units may be realized through the cooperation of one or more programs installed in the access management device 10 and hardware such as the processor and memory of the access management device 10.

[0016] The acquisition unit 11 acquires information indicating a specific access management device. The registration unit 12 registers a notification request that a specific access management device has been activated. If an abnormality occurs in the access management device 10 and a specific access management device is activated, the control unit 13 sends information to the terminal (user terminal) that is registered with the access management device 10 to register that terminal with the specific access management device.

[0017] In the example shown in Figure 1, the maintenance device 50 also includes a transmission unit 51 and a startup unit 52. These units may be realized through the cooperation of one or more programs installed in the maintenance device 50 and the hardware of the maintenance device 50, such as its processor and memory.

[0018] The transmission unit 51 transmits information to the access management device 10 indicating a specific access management device to which terminals registered with the access management device 10 should be registered if an abnormality occurs in the access management device 10. The activation unit 52 activates a specific access management device if an abnormality occurs in the access management device 10.

[0019] (Embodiment 2) <System Configuration> Next, the configuration of the communication system 1 according to the embodiment will be described with reference to Figure 2. Figure 2 is a diagram showing an example of the configuration of the communication system 1 according to the embodiment. In the example of Figure 2, the communication system 1 has access management devices 10A to 10C, user terminals (User Equipment, UE) 20A to 20C, RAN (Radio Access Network) 30, NRF (Network Repository Function) 40, and maintenance equipment 50. In the following, when it is not necessary to distinguish between each of the access management devices 10A to 10C, at least one of the access management devices 10A to 10C will be simply referred to as "access management device 10". Also, when it is not necessary to distinguish between each of the user terminals 20A to 20C, at least one of the user terminals 20A to 20C will be simply referred to as "user terminal 20". Note that the number of access management devices 10, user terminals 20, RAN 30, NRF 40, and maintenance equipment 50 is not limited to the example in Figure 2.

[0020] The access management device 10, NRF 40, and maintenance device 50 may be connected to each other, for example, via the core network CN. The user terminal 20 may also be connected to the core network CN via the RAN 30.

[0021] RAN 30 may include, for example, antenna equipment, base stations, line control devices, etc. In a mobile communication system, RAN 30 transmits and receives data between the user terminal 20 and the core network CN. Examples of mobile communication systems include, for example, fifth-generation mobile communication systems (5G), sixth-generation mobile communication systems (6G, Beyond 5G), fourth-generation mobile communication systems (4G), third-generation mobile communication systems (3G), etc.

[0022] The access management device 10 may be, for example, a server that includes an AMF (Access and Mobility Management Function).

[0023] The user terminal 20 is a terminal having wireless communication functionality using a mobile communication system. The user terminal 20 may be, for example, a smartphone, a mobile device such as a vehicle or aircraft, a wearable device, an IoT (Internet of Things) device, a tablet device, a personal computer, a video conferencing device, an internet television device, etc.

[0024] The NRF 40 may, for example, be a repository that manages each NF (Network Function) in the mobile communication system. The maintenance device 50 performs control to respond to abnormalities in the access management device 10 in the mobile communication system, either based on instructions from an operator or automatically.

[0025] <Hardware Configuration> Figure 3 shows an example of the hardware configuration of the access management device 10 according to the embodiment. In the example in Figure 3, the access management device 10 (computer 100) includes a processor 101, memory 102, and a communication interface 103. These parts may be connected by a bus or the like. The memory 102 stores at least a portion of the program 104. The communication interface 103 includes an interface necessary for communication with other network elements.

[0026] When program 104 is executed in cooperation with the processor 101 and memory 102, etc., the computer 100 performs at least some of the processing of embodiments of the present disclosure. Memory 102 may be of any type. Memory 102 may, in non-limiting examples, be a non-temporary computer-readable storage medium. Memory 102 may also be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. Although only one memory 102 is shown for computer 100, computer 100 may have several physically different memory modules. Processor 101 may be of any type. Processor 101 may include one or more general-purpose computers, dedicated computers, microprocessors, digital signal processors (DSPs), and, in non-limiting examples, processors based on multicore processor architectures. Computer 100 may have multiple processors, such as application-specific integrated circuit chips that are time-dependent to a clock that synchronizes the main processor.

[0027] Embodiments of the present disclosure may be implemented in hardware or in dedicated circuitry, software, logic, or any combination thereof. Some embodiments may be implemented in hardware, while others may be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device.

[0028] This disclosure also provides at least one computer program product tangibly stored on a non-temporary computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions contained in a program module, and is executed on a device on a target real or virtual processor to perform the processes or methods of this disclosure. The program module includes routines, programs, libraries, objects, classes, components, data structures, etc., that perform specific tasks or implement specific abstract data types. The functionality of the program module may be combined or divided among the program module as desired in various embodiments. The machine-executable instructions of the program module can be executed on a local or distributed device. On a distributed device, the program module can reside on both local and remote storage media.

[0029] Program code for performing the methods of this disclosure may be written in any combination of one or more programming languages. These program codes are provided to a processor or controller of a general-purpose computer, a dedicated computer, or other programmable data processing device. When the program code is executed by the processor or controller, the functions / operations in the flowchart and / or block diagrams it implements are performed. The program code runs entirely on the machine, partially on the machine, as a standalone software package, partially on the machine, partially on a remote machine, or entirely on a remote machine or server.

[0030] Programs can be stored and supplied to a computer using various types of non-temporary computer-readable media. Non-temporary computer-readable media include various types of tangible recording media. Examples of non-temporary computer-readable media include magnetic recording media, magneto-optical recording media, optical disc media, and semiconductor memory. Magnetic recording media include, for example, flexible disks, magnetic tapes, and hard disk drives. Magneto-optical recording media include, for example, magneto-optical disks. Optical disc media include, for example, Blu-ray discs, CD (Compact Disc)-ROM (Read Only Memory), CD-R (Recordable), and CD-RW (ReWritable). Semiconductor memory includes, for example, solid-state drives, mask ROMs, PROMs (Programmable ROMs), EPROMs (Erasable PROMs), flash ROMs, and RAMs (random access memory). Programs may also be supplied to a computer using various types of temporary computer-readable media. Examples of temporary computer-readable media include electrical signals, optical signals, and electromagnetic waves. Temporary computer-readable media can supply programs to a computer via wired communication channels such as electric wires and optical fibers, or via wireless communication channels.

[0031] <Processing> Next, an example of the processing of the communication system 1 according to the embodiment will be described with reference to Figures 4 to 6. Figure 4 is a sequence diagram showing an example of the processing of the communication system 1 according to the embodiment. Figure 5 is a diagram showing an example of information recorded in the user terminal DB (database) 501 according to the embodiment. Figure 6 is a diagram showing an example of information recorded in the transfer setting DB 601 according to the embodiment.

[0032] Note that the process in Figure 4 may be executed in any order as long as it does not contradict the process. In the following explanation, we will use the example of a case where the access management device 10A is an operational system that is started under normal circumstances (normal operation), and at least one of the access management devices 10B and 10C is a standby system that is started when the access management device 10A malfunctions.

[0033] In steps S101-1 to S101-2, the maintenance device 50 transmits information to the access management device 10A and RAN 30 indicating a specific access management device 10 (at least one of access management devices 10B and 10C) that is activated when an abnormality occurs in the access management device 10A.

[0034] Here, the maintenance device 50 may, for example, transmit the GUAMI (Globally Unique AMF Identifier) ​​of a specific access management device 10 to the access management device 10A and RAN 30. RAN 30 may retain the access management device 10 notified by the maintenance device 50 as information such as available AMFs. Furthermore, if the user terminal 20 requests registration with a specific access management device 10, RAN 30 may register the user terminal 20 with the specific access management device 10.

[0035] Next, the registration unit 12 of the access management device 10A registers (subscribes to) a notification request with the NRF 40 that a specific access management device 10 has been activated (step S102). Here, the registration unit 12 of the access management device 10A may, for example, send a subscribe request to the NRF 40 that includes the GUAMI of the specific access management device 10.

[0036] Next, the user terminal 20 registers with the access management device 10A via the RAN 30 (step S103). At this point, the control unit 13 of the access management device 10A may receive location registration information from the user terminal 20. This allows the user terminal 20 to communicate with other user terminals via the RAN 30, etc. Furthermore, the user terminal 20 can communicate using the internet via the RAN 30 and the core network CN.

[0037] The control unit 13 of the access management device 10A may record information about user terminals 20 registered with the access management device 10A in the user terminal DB 501. In the example in Figure 5, the user terminal DB 501 records the type of user terminal 20 and the type of communication of the user terminal 20, associated with the user terminal ID. The user terminal ID is the identification information of the user terminal 20. The user terminal ID may include at least one of the following: the mobile phone number (MSISDN, Mobile Subscriber Integrated Service Digital Network Number), the individual identification number (IMSI, International Mobile Subscriber Identity), and the serial number (ICCID, Integrated Circuit Card ID).

[0038] The type of user terminal 20 may include, for example, whether the user terminal 20 is a smartphone, a mobile device such as a vehicle or aircraft, or an IoT device. Furthermore, the type of user terminal 20 may also include, for example, the type of contract between the user of the user terminal 20 and the telecommunications carrier.

[0039] Furthermore, the type of communication of the user terminal 20 may include, for example, the type of QoS (Quality of Service) required for the communication of the user terminal 20. The type of QoS may be, for example, QFI (QoS Flow Identifier) ​​or 5QI (5G QoS Identifier). Alternatively, the type of QoS may be, for example, a network slicing slice ID.

[0040] The following is the processing when an abnormality occurs in the access management device 10A. Subsequently, the control unit 13 of the access management device 10A notifies the maintenance device 50 that an abnormality such as congestion has occurred (step S104). Here, for example, when the degree of resource congestion of a processor or the like in the access management device 10A exceeds a threshold, the control unit 13 of the access management device 10A may notify the maintenance device 50 to that effect. Also, the maintenance device 50 may obtain information indicating the degree of resource congestion of a processor or the like in the access management device 10A from the access management device 10A at regular intervals or the like.

[0041] Subsequently, the maintenance device 50 activates a specific access management device 10 (step S105). Here, the maintenance device 50 may transmit a command for activating the specific access management device 10 to the specific access management device 10.

[0042] Here, the control unit 13 of the access management device 10A or the maintenance device 50 may identify one or more access management devices 10 to be activated among a plurality of specific access management devices 10 based on the type of abnormality of the access management device 10. In this case, the control unit 13 or the maintenance device 50 may determine, for example, that the higher the degree of abnormality (e.g., the degree of congestion), the more or higher-performance access management devices 10 are to be activated.

[0043] Subsequently, the specific access management device 10 notifies (registers) the NRF40 that the specific access management device 10 has been activated (step S106). Here, the specific access management device 10 may transmit a notification including the GUAMI of the specific access management device 10 to the NRF40, for example.

[0044] Subsequently, the NRF40 notifies the access management device 10A that the specific access management device 10 has been activated (step S107). Here, the NRF40 may transmit a notification including the GUAMI of the specific access management device 10 to the access management device 10A, for example.

[0045] Next, the control unit 13 of the access management device 10A sends information to the user terminal 20 that is registered with the access management device 10A to register (transfer) the user terminal 20 to a specific access management device 10 (step S108). At this point, the control unit 13 of the access management device 10A may determine whether the GUAMI registered with the NRF 40 in step S103 matches the GUAMI notified by the NRF 40 in step S107. If they match, the control unit 13 of the access management device 10A may send a Reject including the GUAMI of the specific access management device 10 to the user terminal 20.

[0046] Here, the control unit 13 may identify which user terminals 20 to register with a specific access management device 10 from among the multiple user terminals 20 registered with the access management device 10, based on at least one of the following: the type of each user terminal 20, the type of communication of each user terminal 20, and the type of a specific access management device 10. This allows for load balancing, for example, when congestion occurs at access management device 10A, if access management device 10A is relatively high-performance, by transferring user terminals 20 other than those with relatively high priority to the specific access management device 10. Alternatively, for example, when congestion occurs at access management device 10A, if a specific access management device 10 is relatively high-performance, load balancing can be achieved by transferring only user terminals 20 with relatively high priority to the specific access management device 10. Furthermore, for example, when a relatively severe failure occurs at access management device 10A, all user terminals 20 can be transferred to the specific access management device 10.

[0047] The type of the specific access management device 10 may be, for example, whether the specific access management device 10 is an on-premises type or a public cloud type, etc. In this case, the information indicating the type of the specific access management device 10 may be assigned to the AMF Set ID or AMF Pointer within the GUAMI of the specific access management device 10. Also, the type of the specific access management device 10 may be, for example, information indicated by at least one of the MCC (Mobile Country Code), MNC (Mobile Network Code), AMF Region ID, AMF Set ID, and AMF Pointer within the GUAMI of the specific access management device 10.

[0048] Further, the control unit 13 may specify, based on specific conditions, the user terminals 20 to be registered in the access management device 10B (the first access management device) and the user terminals 20 to be registered in the access management device 10C (the second access management device) among the plurality of user terminals 20 registered in the access management device 10. The specific conditions may be conditions for at least one of the type of each user terminal 20, the type of communication of each user terminal 20, and the type of the specific access management device 10. Thereby, for example, when congestion occurs in the access management device 10A, the user terminals 20 with relatively high priority can be transferred to the access management device 10B which is relatively high-performance, etc., and other user terminals 20 can be transferred to the access management device 10C.

[0049] The control unit 13 may accept a designation (transfer setting) of the user terminal 20 to be registered in the specific access management device 10 according to at least one of the type of each user terminal 20, the type of communication of each user terminal 20, and the type of the specific access management device 10. Thereby, for example, an operator (administrator), etc. can specify the user terminal 20 to be transferred to the specific access management device 10 in case of an abnormality from a maintenance device 50, etc.

[0050] In the example shown in Figure 6, the control unit 13 records the type of user terminal 20 to be transferred and the type of communication of the user terminal 20 to be transferred in the transfer setting DB 601, corresponding to the type of access management device 10. In the example shown in Figure 6, a user terminal 20 whose type is type A2 and whose communication type is type A3 is transferred to a specific access management device 10 whose type is G1.

[0051] Next, the user terminal 20 registers with a specific access management device 10 via the RAN 30 (step S109). Here, the user terminal 20 may, for example, send a registration request including the GUAMI of the specific access management device 10 to the RAN 30. The RAN 30 may then select the specific access management device 10 as the AMF to which the user terminal 20 will register and forward the registration request to the specific access management device 10. The specific access management device 10 may then receive location registration information from the user terminal 20.

[0052] <Modifications> The access management device 10 may be a device contained in a single enclosure, but the access management device 10 of this disclosure is not limited to this. Each part of the access management device 10 may be implemented by cloud computing, for example, consisting of one or more computers. The access management device 10 and the maintenance device 50 may also be configured as an integrated access management device 10. Furthermore, the maintenance device 50 may perform processing on at least some of the functional parts of the access management device 10. Such access management devices 10 are also included as examples of the "access management device" of this disclosure.

[0053] Although the present disclosure has been described above with reference to embodiments, the present disclosure is not limited to the embodiments described above. Various modifications to the structure and details of the present disclosure can be made as can be understood by those skilled in the art within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0054] Some or all of the embodiments described above may also be described as follows, but are not limited to the following. Some or all of the elements (e.g., configuration and function) described in each appendix dependent on Appendix 1 may also be dependent on other independent appendices of other categories in a similar manner. Some or all of the elements described in any appendix may be applied to various hardware, software, recording means, systems, and methods for recording software.

[0055] (Note 1) An access management device comprising: an acquisition unit that acquires information indicating a specific access management device; a registration unit that registers a notification request that the specific access management device has been activated; and a control unit that, when an abnormality occurs in the access management device and the specific access management device is activated, transmits information to the terminals to cause the terminals registered with the access management device to be registered with the specific access management device. (Note 2) The access management device according to Note 1, wherein the control unit identifies terminals to be registered with the specific access management device from among a plurality of terminals registered with the access management device, based on at least one of the type of each terminal, the type of communication of each terminal, and the type of the specific access management device. (Note 3) The access management device according to Note 2, wherein the control unit accepts a designation of terminals to be registered with the specific access management device according to at least one of the type of each terminal, the type of communication of each terminal, and the type of the specific access management device. (Note 4) The access management device according to Note 1 or 2, wherein the specific access management device includes a first access management device and a second access management device, and the control unit identifies which of the first access management device and the second access management device to activate based on the type of abnormality of the access management device. (Note 5) The access management device according to Note 1 or 2, wherein the specific access management device includes a first access management device and a second access management device, and the control unit identifies which terminals to register with the first access management device and which terminals to register with the second access management device based on at least one of the type of each terminal, the type of communication of each terminal, and the type of the specific access management device, from among a plurality of terminals registered with the access management device. (Note 6) The access management device described in Note 1 or 2, wherein the access management device includes an AMF (Access and Mobility Management Function), and the registration unit registers a notification request that the specific access management device has been activated with the NRF (Network Registry Function).(Note 7) The type of the specific access management device is indicated by at least one of the following in the GUAMI (Globally Unique AMF Identifier) ​​of the specific access management device: MCC (Mobile Country Code), MNC (Mobile Network Code), AMF Region ID, AMF Set ID, and AMF Pointer, as described in Note 2. (Note 8) An access management method in which the access management device acquires information indicating a specific access management device, registers a notification request that the specific access management device has been activated, and, if an abnormality occurs in the access management device and the specific access management device is activated, transmits information to the terminal to cause the terminal registered with the access management device to be registered with the specific access management device. (Note 9) A program that causes an access management device to execute a process that obtains information indicating a specific access management device, registers a notification request that the specific access management device has been activated, and, if an abnormality occurs in the access management device and the specific access management device is activated, sends information to the terminal to register the terminal registered with the access management device with the specific access management device. (Note 10) A maintenance device having a transmission unit that sends information indicating a specific access management device to the access management device to register the terminal registered with the access management device when an abnormality occurs in the access management device, and an activation unit that activates the specific access management device when an abnormality occurs in the access management device. (Note 11) A maintenance method that sends information indicating a specific access management device to the access management device to register the terminal registered with the access management device when an abnormality occurs in the access management device, and activates the specific access management device when an abnormality occurs in the access management device. (Note 12) A program that, in the event of an abnormality in the access management device, sends information to the access management device indicating a specific access management device to register terminals registered with the access management device, and in the event of an abnormality in the access management device, causes a computer to execute a process to start the specific access management device.(Note 13) A system including an access management device and a maintenance device, wherein the access management device includes: an acquisition unit that acquires information indicating a specific access management device; a registration unit that registers a notification request that the specific access management device has been activated; a control unit that, when an abnormality occurs in the access management device and the specific access management device is activated, transmits information to the terminals to cause the terminals registered with the access management device to be registered with the specific access management device; and the maintenance device includes: a transmission unit that, when an abnormality occurs in the access management device, transmits information to the access management device indicating a specific access management device to cause the terminals registered with the access management device to be registered with the access management device; and an activation unit that, when an abnormality occurs in the access management device, activates the specific access management device. (Note 14) A method comprising: an access management device acquiring information indicating a specific access management device; registering a notification request that the specific access management device has been activated; when an abnormality occurs in the access management device and the specific access management device is activated, transmitting information to the terminals to cause the terminals registered with the access management device to be registered with the specific access management device; and when an abnormality occurs in the access management device, a maintenance device transmitting information to the access management device indicating a specific access management device to cause the terminals registered with the access management device to be registered with the access management device; and when an abnormality occurs in the access management device, activating the specific access management device.

[0056] This application claims priority based on Japanese Patent Application No. 2024-174776, filed on 4 October 2024, and incorporates all of its disclosures herein.

[0057] 1 Communication system 10 Access management device 11 Acquisition unit 12 Registration unit 13 Control unit 20 User terminal 30 RAN 40 NRF 50 Maintenance device 51 Transmission unit 52 Startup unit

Claims

1. An access management device comprising: an acquisition unit that acquires information indicating a specific access management device; a registration unit that registers a notification request that the specific access management device has been activated; and a control unit that, when an abnormality occurs in the access management device and the specific access management device is activated, transmits information to the terminals to cause the terminals registered with the access management device to be registered with the specific access management device.

2. The access management device according to claim 1, wherein the control unit identifies a terminal to be registered with the specific access management device based on at least one of the following: the type of each terminal, the type of communication of each terminal, and the type of the specific access management device, from among a plurality of terminals registered with the access management device.

3. The access management device according to claim 2, wherein the control unit accepts a designation of terminals to be registered with the specific access management device, corresponding to at least one of the types of each terminal, the types of communication of each terminal, and the type of the specific access management device.

4. The access control device according to claim 1 or 2, wherein the specific access control device includes a first access control device and a second access control device, and the control unit identifies which of the first access control device and the second access control device to activate based on the type of abnormality of the access control device.

5. The access management device according to claim 1 or 2, wherein the specific access management device includes a first access management device and a second access management device, and the control unit identifies terminals to be registered with the first access management device and terminals to be registered with the second access management device based on at least one of the type of each terminal, the type of communication of each terminal, and the type of the specific access management device, from among a plurality of terminals registered with the access management device.

6. The access management device according to claim 1 or 2, wherein the access management device includes an AMF (Access and Mobility Management Function), and the registration unit registers a notification request that a specific access management device has been activated with an NRF (Network Registry Function).

7. The access management device according to claim 2, wherein the type of the specific access management device is indicated by at least one of the following in the GUAMI (Globally Unique AMF Identifier): MCC (Mobile Country Code), MNC (Mobile Network Code), AMF Region ID, AMF Set ID, and AMF Pointer.

8. An access management method comprising: an access management device acquiring information indicating a specific access management device; registering a notification request that the specific access management device has been activated; and, if an abnormality occurs in the access management device and the specific access management device is activated, sending information to the terminals to register the terminals registered with the access management device with the specific access management device.

9. The access management method according to claim 8, wherein in the step of transmitting to the terminal, the terminal to be registered with the specific access management device is identified from among a plurality of terminals registered with the access management device based on at least one of the type of each terminal, the type of communication of each terminal, and the type of the specific access management device.

10. The access management method according to claim 9, wherein in the step of transmitting to the terminal, the method accepts the designation of a terminal to be registered with the specific access management device, according to at least one of the types of each terminal, the types of communication of each terminal, and the types of the specific access management device.

11. The access management method according to claim 8 or 9, wherein the specific access management device includes a first access management device and a second access management device, and in the step of transmitting to the terminal, the device to be activated from among the first access management device and the second access management device is identified based on the type of abnormality of the access management device.

12. The access management method according to claim 8 or 9, wherein the specific access management device includes a first access management device and a second access management device, and in the step of transmitting to the terminal, the access management method identifies which terminals to be registered with the first access management device and which terminals to be registered with the second access management device from among a plurality of terminals registered with the access management device, based on at least one of the type of each terminal, the type of communication of each terminal, and the type of the specific access management device.

13. The access management method according to claim 8 or 9, wherein the access management device includes an AMF (Access and Mobility Management Function), and in the step of registering the notification request, a notification request that the specific access management device has been activated is registered with an NRF (Network Registry Function).

14. The access management method according to claim 9, wherein the type of the specific access management device is indicated by at least one of the following in the GUAMI (Globally Unique AMF Identifier) ​​of the specific access management device: MCC (Mobile Country Code), MNC (Mobile Network Code), AMF Region ID, AMF Set ID, and AMF Pointer.

15. A program that causes an access management device to perform the following actions: obtain information indicating a specific access management device; register a notification request that the specific access management device has been activated; and, if an abnormality occurs in the access management device and the specific access management device is activated, send information to the terminals to cause them to register the terminals registered with the access management device with the specific access management device.

16. A maintenance device comprising: a transmission unit that transmits information to the access management device indicating a specific access management device to which terminals registered with the access management device should be registered when an abnormality occurs in the access management device; and a startup unit that starts the specific access management device when an abnormality occurs in the access management device.

17. A maintenance method comprising: transmitting information to an access management device indicating a specific access management device to register terminals registered with the access management device in the event of an abnormality in the access management device; and activating the specific access management device in the event of an abnormality in the access management device.

18. A program that, in the event of an abnormality in the access management device, sends information to the access management device indicating a specific access management device to register terminals registered with the access management device, and in the event of an abnormality in the access management device, causes a computer to execute a process to activate the specific access management device.

19. A system including an access management device and a maintenance device, wherein the access management device includes: an acquisition unit that acquires information indicating a specific access management device; a registration unit that registers a notification request that the specific access management device has been activated; a control unit that, when an abnormality occurs in the access management device and the specific access management device is activated, transmits information to the terminals to cause the terminals registered with the access management device to be registered with the specific access management device; and the maintenance device includes: a transmission unit that, when an abnormality occurs in the access management device, transmits information to the access management device indicating the specific access management device to cause the terminals registered with the access management device to be registered with the access management device; and an activation unit that, when an abnormality occurs in the access management device, activates the specific access management device.

20. A method comprising: an access management device acquiring information indicating a specific access management device; registering a notification request that the specific access management device has been activated; when an abnormality occurs in the access management device and the specific access management device is activated, sending information to the terminals to cause the terminals registered with the access management device to be registered with the specific access management device; and when an abnormality occurs in the access management device, a maintenance device sending information indicating the specific access management device to the access management device to cause the terminals registered with the access management device to be registered with the access management device; and when an abnormality occurs in the access management device, activating the specific access management device.

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