US-20260129598-A1 - ACCESS BARRING DURING DISASTER ROAMING IN A COMMUNICATION NETWORK SYSTEM

Abstract

A method performed by a user equipment (UE) for access barring during disaster roaming in a communication network system is provided. The method includes receiving, by the UE, an access stratum (AS) message from a network apparatus providing disaster roaming services for registered UEs, wherein the AS message comprises at least one of disaster-related information or access barring indication to be applied to inbound disaster roaming UEs, determining, by the UE, whether the UE is barred from using the disaster roaming services from the network apparatus based on the received AS message, and performing, by the UE, one of preventing, by the UE, to attempt to register or send any non-access stratum (NAS) or the AS message on the network apparatus providing the disaster roaming services for registering or sending the NAS or AS signaling message for disaster roaming services, in response to determining that the UE is barred from using the disaster roaming services from the network apparatus; or allowing, by the UE, to attempt to register or send any NAS or the AS message on the network apparatus providing the disaster roaming services for registering or sending the NAS or AS signaling message for disaster roaming services, in response to determining that the UE is not barred from using the disaster roaming services from the network apparatus.

Inventors

• Jagadeesh GANDIKOTA
• Lalith KUMAR
• Danish Ehsan HASHMI
• Pratibha Kattemane SATYAGANAPATI
• Arvind Ramamurthy
• Anurag MANDILWAR

Assignees

• SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date

20260507

Application Date

20251126

Priority Date

20250930

Claims (20)

1. 1 . A method performed by a user equipment (UE) for access barring during disaster roaming in a communication network system, the method comprising: receiving an access stratum (AS) message from a network apparatus providing disaster roaming services for registered UEs, wherein the AS message comprises at least one of disaster-related information or an access barring indication to be applied to inbound disaster roaming UEs; determining whether the UE is barred from using the disaster roaming services from the network apparatus based on the received AS message; in accordance with a determination that the UE is barred from using the disaster roaming services from the network apparatus, preventing to attempt to transmit any non-access stratum (NAS) or the AS message on the network apparatus providing the disaster roaming services; and in accordance with a determination that the UE is not barred from using the disaster roaming services from the network apparatus, allowing to attempt to transmit any NAS or the AS message on the network apparatus.
2. 2 . The method of claim 1 , further comprising: in response to determining that the UE is barred from using disaster roaming services, performing, by the UE, at least one of: inhibiting, based on the access barring indication, the UE from initiating NAS signaling messages or AS signaling messages on at least one of the network apparatus, Tracking Area Identity (TAI) associated with a disaster roaming public land mobile network (PLMN), PLMN identification (ID) associated with the PLMN, and a Radio Access Technology (RAT) associated with the disaster roaming PLMN; or preventing that is already registered for the disaster roaming services, from attempting to access the disaster roaming PLMN for mobile originated (MO) signaling or MO data, including for the disaster roaming services, based on the access barring indication.
3. 3 . The method of claim 1 , further comprising: performing a public land mobile network (PLMN) search to identify and register to another PLMN.
4. 4 . The method of claim 1 , wherein the network apparatus comprises visited PLMN (VPLMN) providing disaster roaming services on an evolved packet system (EPS).
5. 5 . The method of claim 1 , wherein the access barring indication includes information related to access barring for disaster roaming services as sent by the network apparatus.
6. 6 . The method of claim 1 , wherein the AS message is received by the UE on the network apparatus in response to a disaster event in a network coverage area of the UE.
7. 7 . The method of claim 1 , wherein the AS message includes at least one of a signaling message or system information block information.
8. 8 . The method of claim 1 , wherein the UE is configured to determine access barring based on a public land mobile network (PLMN) identification (ID), a cell ID, a tracking area identity (TAI), or radio access technology (RAT) information included in the AS message.
9. 9 . The method of claim 1 , wherein determining whether the UE is barred from using the disaster roaming services comprises: performing a barring check for disaster roaming by a radio resource control (RRC) layer of the UE based on the access barring information received from the network apparatus and a notification from a NAS layer to an AS layer, wherein the notification indicates an establishment cause indicating disaster roaming or a call type indicating disaster roaming.
10. 10 . A User Equipment (UE) for access barring during disaster roaming in a communication network system, the UE comprising: communication circuitry; memory, comprising one or more storage media, storing instructions; and one or more processors communicatively coupled to the memory, wherein the instructions, when executed by the one or more processors individually or collectively, cause the UE to: receive an access stratum (AS) message from a network apparatus providing disaster roaming services for registered UEs, wherein the AS message comprises at least one of disaster-related information or an access barring indication to be applied to inbound disaster roaming UEs; determine whether the UE is barred from using the disaster roaming services from the network apparatus based on the received AS message; in accordance with a determination that the UE is barred from using the disaster roaming services from the network apparatus, prevent to attempt to transmit any non-access stratum (NAS) or the AS message on the network apparatus providing the disaster roaming services; and in accordance with a determination that the UE is not barred from using the disaster roaming services from the network apparatus, allow to attempt to transmit any NAS or the AS message on the network apparatus.
11. 11 . The UE of claim 10 , wherein the instructions, when executed by the one or more processors individually or collectively, cause the UE to: in response to determining that the UE is barred from using disaster roaming services, perform at least one of: inhibiting, based on the access barring indication, the UE from initiating NAS signaling messages or AS signaling messages on at least one of the network apparatus, Tracking Area Identity (TAI) associated with a disaster roaming public land mobile network (PLMN), PLMN identification (ID) associated with the PLMN, and a Radio Access Technology (RAT) associated with the disaster roaming PLMN; or preventing that is already registered for the disaster roaming services, from attempting to access the disaster roaming PLMN for mobile originated (MO) signaling or MO data, including for the disaster roaming services, based on the access barring indication.
12. 12 . The UE of claim 10 , wherein the instructions, when executed by the one or more processors individually or collectively, cause the UE to: perform a public land mobile network (PLMN) search to identify and register to another PLMN.
13. 13 . The UE of claim 10 , wherein the network apparatus comprises visited PLMN (VPLMN) providing disaster roaming services on an evolved packet system (EPS).
14. 14 . The UE of claim 10 , wherein the access barring indication includes information related to access barring for disaster roaming services as sent by the network apparatus.
15. 15 . The UE of claim 10 , wherein the AS message is received by the UE on the network apparatus in response to a disaster event in a network coverage area of the UE.
16. 16 . The UE of claim 10 , wherein the AS message includes at least one of a signaling message or system information block information.
17. 17 . The UE of claim 10 , wherein the UE is configured to determine access barring based on a public land mobile network (PLMN) identification (ID), a cell ID, a tracking area identity (TAI), or radio access technology (RAT) information included in the AS message.
18. 18 . The UE of claim 10 , wherein the instructions, when executed by the one or more processors individually or collectively, cause the UE to: perform a barring check for disaster roaming by a radio resource control (RRC) layer of the UE based on the access barring indication received from the network apparatus and a notification from a NAS layer to an AS layer, wherein the notification indicates an establishment cause indicating disaster roaming or a call type indicating disaster roaming.
19. 19 . A method performed by a network apparatus for access barring during disaster roaming in a communication network system, the method comprising: creating an access stratum (AS) message comprising disaster-related information and an access barring indication to be applied to inbound disaster roaming user equipment (UE), wherein the network apparatus is providing disaster roaming services to the UE; and transmitting the AS message to the UE during the disaster.
20. 20 . One or more non-transitory computer-readable storage media storing one or more computer programs including computer-executable instructions that, when executed by one or more processors of a user equipment (UE) individually or collectively, cause the UE to perform operations, the operations comprising: receiving an access stratum (AS) message from a network apparatus providing disaster roaming services for registered UEs, wherein the AS message comprises at least one of disaster-related information or an access barring indication to be applied to inbound disaster roaming UEs; determining whether the UE is barred from using the disaster roaming services from the network apparatus based on the received AS message; in accordance with a determination that the UE is barred from using the disaster roaming services from the network apparatus, preventing to attempt to transmit any non-access stratum (NAS) or the AS message on the network apparatus providing the disaster roaming services; and in accordance with a determination that the UE is not barred from using the disaster roaming services from the network apparatus, allowing to attempt to transmit any NAS or the AS message on the network apparatus.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) The application is a continuation application, claiming priority under 35 U.S.C. § 365(c), of an International application No. PCT/KR2025/018004, filed on Nov. 5, 2025, which is based on and claims the benefit of an Indian Provisional patent application 202441085595, filed on Nov. 7, 2024, in the India Intellectual Property Office, of an Indian Patent Application number 202441086705, filed on Nov. 11, 2024, in the Indian Intellectual Property Office, and of an Indian Complete patent application No. 202441085595, filed on Sep. 30, 2025, in the Indian Intellectual Property Office, the disclosure of each of which is incorporated by reference herein in its entirety. FIELD OF INVENTION The disclosure relates to a field of wireless communication network systems. More particularly, the disclosure related to methods and systems for implementing access barring during disaster roaming within a communication network system. BACKGROUND The advent of fifth generation (5G) technology and the Evolved Packet System (EPS) has significantly enhanced the capabilities of mobile communication systems, enabling higher data rates, lower latency, and more reliable connections. Among the various features supported by these advanced systems is the Minimization of Service Interruption (MINT), which aims to ensure that user equipment (UE) can obtain service from a Public Land Mobile Network (PLMN) offering disaster roaming services when a disaster condition applies to the UE's determined PLMN. The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure. OBJECT OF THE INVENTION Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a method, a user equipment (UE), and a network apparatus for access barring during disaster roaming in a communication network system. Another aspect of the disclosure is to provide a utilize broadcast information i.e. System Information Block (SIB) that carries information related to access class barring specifically for the UEs that are trying to access the network for disaster roaming services. The information about access barring of disaster roaming can be part of the existing System Information Block or a new System Information Block. Another aspect of the disclosure is to provide a method for the UEs trying to access the network for disaster roaming services over EPS to evaluate the access class barring information broadcasted by the network and then establish the connection with the network or refrain from accessing the network. Another aspect of the disclosure is to provide a method for the UE to read the SIB information and find out that the home PLMN or initial first PLMN or RAT is no longer part of the disaster roaming PLMN list of the serving PLMN and thus identify that the disaster condition on HPLMN or initial first PLMN or RAT has ended and optionally perform deregistration from the disaster roaming PLMN and then perform PLMN selection or cell selection or reselection and register on PLMN A. Another aspect of the disclosure is to provide a method for the UEs registered on a disaster roaming PLMN for disaster roaming services to enter the PLMN search state and perform PLMN or RAT search and (re)selection procedures when a congestion cause code is received from the serving network PLMN in response to one of the UE messages (Service request or Tracking area Update request or Attach Request), for example, reject cause #22 Congestion. Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. SUMMARY In accordance with an aspect of the disclosure, a method performed by a user equipment (UE) for access barring during disaster roaming in a communication network system is provided. The method includes receiving, by the UE, an access stratum (AS) message from a network apparatus providing disaster roaming services for registered UEs, wherein the AS message includes at least one of disaster-related information or an access barring indication to be applied to inbound disaster roaming UEs, determining, by the UE, whether the UE is barred from using the disaster roaming services from the network apparatus based on the received AS message, and performing, by the UE, one of: preventing, by the UE, to attempt to register or send any non-access stratum (NAS) or the AS message on the network apparatus providing the disaster roaming services for registering or sending the NAS or AS signaling message for disaster roaming services, in response to determining that the UE is barred from