# US 12,192,881 B2 · In and relating to disaster inbound roamers in a telecommunication network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,881 B2 - Document ID: US12192881B2 - Status: Granted - Kind: B2 - Application number: 17/629,630 - Filed: 2020-07-24 - Published: 2022-08-04 - Granted: 2025-01-07 - Earliest claimed: 2019-07-25 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Erik Guttman; Kundan Tiwari - Web page: https://patentgrep.com/patent/US12192881B2 ## CPC - H04L 69/40: for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection (management of faults, events, alarms or notifications in data switching networks H04L41/06) - H04W 48/06: based on traffic conditions - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS] - H04W 8/06: Registration at serving network Location Register, VLR or user mobility server - H04W 48/10: using broadcasted information - H04W 60/00: Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration - H04W 76/50: for emergency connections - H04W 8/26: Network addressing or numbering for mobility support - H04W 48/12: using downlink control channel - H04W 48/18: Selecting a network or a communication service - H04W 60/04: using triggered events - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Disclosed is a method of operating a second telecommunication network to manage access of Disaster Inbound Roamers, DIR, from a first telecommunication network, to the second telecommunication network, comprising the step of: the second telecommunication network broadcasting a message indicating to User Equipments, UEs, of the first telecommunications network that they are able to roam on the second telecommunication network. ## Claims ### Claim 1 A method performed by a terminal in a wireless communication system, the method comprising: identifying that the terminal loses coverage in a first public land mobile network (PLMN); receiving, from a base station related to a second PLMN, a broadcast message indicating that the second PLMN is accessible for disaster inbound roamers; based on the broadcast message, determining the second PLMN for a disaster roaming, wherein the second PLMN is one of PLMNs configured to be used in a disaster condition; and initiating a registration procedure on the second PLMN, wherein whether the second PLMN is allowed to access is determined based on a random number generated by the terminal and a unified access control (UAC) barring threshold value for an access for the disaster roaming received from the second base station. ### Claim 2 (depends on 1) The method of claim 1, wherein the access for the disaster roaming corresponds to an access identity 3. ### Claim 3 (depends on 1) The method of claim 1, wherein the registration procedure on the second PLMN is initiated after a waiting timer expires. ### Claim 4 (depends on 1) The method of claim 1, wherein the initiating of the registration procedure on the second PLMN comprises transmitting, to the base station, a registration request message including a registration type which indicates that the registration procedure is for the disaster roaming. ### Claim 5 A terminal in a wireless communication system, the terminal comprising: a transceiver; and a controller coupled with the transceiver and configured to: identify that the terminal loses coverage in a first public land mobile network (PLMN), receive, from a base station related to a second PLMN, a broadcast message indicating that the second PLMN is accessible for disaster inbound roamers, based on the broadcast message, determine the second PLMN for a disaster roaming, wherein the second PLMN is one of PLMNs configured to be used in a disaster condition, and initiating a registration procedure on the second PLMN, wherein whether the second PLMN is allowed to access is determined based on a random number generated by the terminal and a unified access control (UAC) barring threshold value for an access for the disaster roaming received from the second base station. ### Claim 6 (depends on 5) The terminal of claim 5, wherein the access for the disaster roaming corresponds to an access identity 3. ### Claim 7 (depends on 5) The terminal of claim 5, wherein the registration procedure on the second PLMN is initiated after a waiting timer expires. ### Claim 8 (depends on 5) The terminal of claim 5, wherein the controller is further configured to transmit, to the base station, a registration request message including a registration type which indicates that the registration procedure is for the disaster roaming.