Method for managing prohibited plmn list during disaster roaming, and apparatus supporting same

A User Equipment (UE) operating in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
• determining that there is no available Public Land Mobile Network (PLMN) other than PLMNs included in a first list;
• determining whether the PLMNs included in the first list can provide disaster roaming service;
• including in a second list at least one PLMN capable of providing the disaster roaming service from among the PLMNs included in the first list;
• and
• based on a disaster condition applying in a Home PLMN (HPLMN):
• i) performing PLMN selection with respect to the at least one PLMN included in the second list, and ii) selecting a disaster roaming PLMN from among the at least one PLMN and receiving the disaster roaming service from the disaster roaming PLMN.

A processing apparatus operating in a wireless communication system, the processing apparatus comprising:

• at least one processor;
• and
• at least one memory operably connectable to the at least one processor,
• wherein the at least one processor is adapted to perform operations comprising:
• determining that there is no available Public Land Mobile Network (PLMN) other than PLMNs included in a first list;
• determining whether the PLMNs included in the first list can provide disaster roaming service;
• including in a second list at least one PLMN capable of providing the disaster roaming service from among the PLMNs included in the first list;
• and
• based on a disaster condition applying in a Home PLMN (HPLMN):
• i) performing PLMN selection with respect to the at least one PLMN included in the second list, and ii) selecting a disaster roaming PLMN from among the at least one PLMN and receiving the disaster roaming service from the disaster roaming PLMN.