# US 2023/0276342 A1 · Method for managing prohibited plmn list during disaster roaming, and apparatus supporting same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0276342 A1 - Document ID: US20230276342A1 - Status: Published application - Kind: A1 - Application number: 18/005,463 - Filed: 2021-07-09 - Published: 2023-08-31 - Earliest claimed: 2020-07-13 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sangmin PARK; Sungduck CHUN; Hyunsook KIM - Web page: https://patentgrep.com/patent/US20230276342A1 ## CPC - H04W 48/02: Access restriction performed under specific conditions - H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS] - H04W 8/02: Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks - H04W 48/16: Discovering, processing access restriction or access information - H04W 48/18: Selecting a network or a communication service - 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 Provided are a method for managing a prohibited PLMN list during disaster roaming, and an apparatus supporting same. User Equipment (UE) determines, when there is no available public land mobile network (PLMN) other than PLMNs included in a first list, whether the PLMNs included in the first list can provide a disaster roaming service, and includes in a second list at least one PLMN that can provide the disaster roaming service, from among the PLMNs included in the first list. On the basis that a disaster condition is applied to a home PLMN (HPLMN), the UE i) performs PLMN selection for the at least one PLMN included in the second list, and ii) selects a disaster roaming PLMN from among the at least one PLMN and receives the disaster roaming service provided from the disaster roaming PLMN. ## Claims ### Claim 1 A method performed by a user equipment (UE) operating in a wireless communication system, the method 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. ### Claim 2 (depends on 1) The method of claim 1, wherein the first list is a forbidden PLMN list. ### Claim 3 (depends on 1) The method of claim 1, wherein the second list is a temporarily allowed forbidden PLMN list or an exempted forbidden PLMN list. ### Claim 4 (depends on 1) The method of claim 1, wherein, based on the disaster condition applying in the HPLMN, the at least one PLMN included in the second list is not deleted from the first list. ### Claim 5 (depends on 1) The method of claim 1, wherein, based on the disaster condition having ended in the HPLMN, the method further comprises i) performing a deregistration procedure from the disaster roaming PLMN, and ii) deleting the at least one PLMN from the second list. ### Claim 6 (depends on 1) The method of claim 1, wherein the at least one PLMN has a highest priority in the PLMNs except for the HPLMN. ### Claim 7 (depends on 1) The method of claim 1, wherein the UE is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the UE. ### Claim 8 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. ### Claim 9 (depends on 8) The UE of claim 8, wherein the first list is a forbidden PLMN list. ### Claim 10 (depends on 8) The UE of claim 8, wherein the second list is a temporarily allowed forbidden PLMN list or an exempted forbidden PLMN list. ### Claim 11 (depends on 8) The UE of claim 8, wherein, based on the disaster condition applying in the HPLMN, the at least one PLMN included in the second list is not deleted from the first list. ### Claim 12 (depends on 8) The UE of claim 8, wherein, based on the disaster condition having ended in the HPLMN, the operations further comprise i) performing a deregistration procedure from the disaster roaming PLMN, and ii) deleting the at least one PLMN from the second list. ### Claim 13 (depends on 8) The UE of claim 8, wherein the at least one PLMN has a highest priority in the PLMNs except for the HPLMN. ### Claim 14 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. ### Claim 15 (canceled)