# US 2025/0159639 A1 · Terminal mobility management method and device using nas

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- Number: US 2025/0159639 A1
- Document ID: US20250159639A1
- Status: Published application
- Kind: A1
- Application number: 18/835,908
- Filed: 2023-02-07
- Published: 2025-05-15
- Earliest claimed: 2022-02-09
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Kyungjoo SUH
- Web page: https://patentgrep.com/patent/US20250159639A1

## CPC

- H04W 60/00: Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
- H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
- H04W 24/04: Arrangements for maintaining operational condition
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 48/18: Selecting a network or a communication service
- H04W 8/06: Registration at serving network Location Register, VLR or user mobility server
- H04W 8/24: Transfer of terminal data
- H04W 60/04: using triggered events
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present disclosure may provide a device and method for managing the mobility of a terminal in a wireless communication system. Disclosed is a method for selecting a PLMN or SNPN, in a process of confirming service disruption of a first communication provider communication network and utilizing service of a second communication provider communication network, on the basis of capability information about the ability of a terminal in a wireless communication system to utilize a communication network of a provider that the terminal is not subscribed to in a disaster situation.

## Claims

### Claim 1

A method of a terminal in a wireless communication system, the method comprising:
receiving, from a user data management (UDM) or a first access and mobility management function (AMF), capability information about the ability to utilize a communication network of a second communication provider in the event of a service disruption of a communication network of a first communication provider to which the terminal is subscribed;
confirming the service disruption of the communication network of the first communication provider;
performing a scan of the public land mobile network (PLMN) or standalone non public network (SNPN) of the second communication provider; and
selecting a PLMN or SNPN to perform the registration based on a result of the scan.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
transmitting a first registration request message to the first AMF; and
receiving a first registration accept message from the first AMF,
wherein the first registration accept message comprises information relating to a standalone non public network (SNPN).

### Claim 3 (depends on 2)

The method of claim 2, wherein it is characterized that the information related to the SNPN comprises information about at least one of a subscribed SNPN, a preferred SNPN, or a high priority SNPN.

### Claim 4 (depends on 2)

The method of claim 2, wherein the first registration accept message comprises a disaster PLMN (DPLMN) list and it is characterized that selecting the PLMN or SNPN is performed based on PLMN information or SNPN information included in the DPLMN list.

### Claim 5 (depends on 2)

The method of claim 2, further comprising:
storing the list of disaster PLMNs (DPLMNs) included in the first registration accept message as operator controlled PLMNs,
wherein it is characterized that selecting a PLMN or SNPN is performed based on PLMN information or SNPN information included in the operator controlled PLMN.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
transmitting a second registration request message to a second AMF connected to the RAN of the second communication provider,
wherein the second registration request message comprises a disaster indicator for a disaster condition of the first communication provider.

### Claim 7 (depends on 6)

The method of claim 6, further comprising:
receiving a second registration accept message in response to the second registration request message from a second AMF of the core network connected to the RAN of the second communication provider,
wherein the second registration accept message further comprises an identifier or bit indicating a disaster situation, and
wherein the second registration accept message further comprises timer information for a duration for which the service from the second communication provider is allowed to the terminal.

### Claim 8 (depends on 1)

The method of claim 1, wherein selecting the PLMN or SNPN is performed based on the following priorities:
(1) a registered PLMN (RPLMN), an equivalent PLMN (EPLMN), or a disaster PLMN (DPLMN)
(2) a user-controlled PLMN
(3) an operator controlled PLMN
(4) a PLMN reported by an access stratum (AS)

### Claim 9

A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a control unit configured to:
receive, from a user data management (UDM) or a first access and mobility management function (AMF), capability information about the ability to utilize the communication network of the second communication provider when a service disruption occurs in the communication network of the first communication provider to which the terminal subscribes,
confirm the service disruption of the communication network of the first communication provider,
perform a scan on the public land mobile network (PLMN) or standalone non public network (SNPN) of the second communication provider, and
select a PLMN or SNPN to perform a registration based on a result of the scan.

### Claim 10 (depends on 9)

The terminal of claim 9,
wherein the control unit is further configured to:
transmit a first registration request message to the first AMF, and
receive a first registration accept message from the first AMF,
wherein the registration accept message comprises information relating to a standalone non public network (SNPN), and
wherein it is characterized that the information relating to the SNPN comprises information about at least one of a subscribed SNPN, a preferred SNPN, or a high priority SNPN.

### Claim 11 (depends on 10)

The terminal of claim 10,
wherein the first registration accept message comprises a DPLMN (disaster PLMN) list, and
wherein it is characterized that the control unit selects a PLMN to perform registration based on PLMN information or SNPN information included in the DPLMN list.

### Claim 12 (depends on 10)

The terminal of claim 10, wherein the control unit is further configured to:
store the disaster PLMN (DPLMN) list included in the first registration accept message as an operator controlled PLMN; and
select a PLMN or SNPN to perform registration based on PLMN information or SNPN information included in the operator-controlled PLMN.

### Claim 13 (depends on 9)

The terminal of claim 9,
wherein the control unit is further configured to transmit a second registration request message to a second AMF connected to the RAN of the second communication provider, and
wherein a disaster indicator for a disaster situation in the communication network of the first communication provider is included in the second registration request message.

### Claim 14 (depends on 13)

The terminal of claim 13,
wherein the control unit is further configured to receive a second registration accept message for the second registration request message from a second AMF of the core network connected to the RAN of the second communication provider,
wherein the second registration accept message further comprises an identifier or bit indicating a disaster situation, and
wherein the second registration accept message further comprises timer information for a duration for which the service of the second communication provider is allowed to the terminal.

### Claim 15 (depends on 9)

The terminal of claim 9, wherein the control unit is further configured to select a PLMN or SNPN to register based on the following priorities:
(1) a registered PLMN (RPLMN), an equivalent PLMN (EPLMN), or a disaster PLMN (DPLMN)
(2) a user controlled PLMN
(3) an operator controlled PLMN
(4) PLMN reported by access stratum (AS)