# US 12,772,077 B2 · Method for performing a tracking area update procedure when MINT service is supported, and user equipment therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,772,077 B2 - Document ID: US12772077B2 - Status: Granted - Kind: B2 - Application number: 19/460,773 - Filed: 2026-01-27 - Published: 2026-06-04 - Granted: 2026-10-20 - Earliest claimed: 2025-09-08 - Assignees: H3NITY Co., Ltd. - Applicants: H3NITY Co., Ltd. - Inventors: Hyo Jin Hong - Web page: https://patentgrep.com/patent/US12772077B2 ## CPC - H04W 24/02: Arrangements for optimising operational condition - H04W 8/22: Processing or transfer of terminal data, e.g. status or physical capabilities - H04W 36/362: {Conditional handover} - 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 According to one embodiment of this specification, there is provided an operation method of user equipment (UE). The method may comprise: if the UE supports a minimization of service interruption (MINT)-evolved packet system (EPS), setting a MINT-EPS bit to “MINT-EPS supported” in capability information; upon selecting a public land mobile network (PLMN) for disaster roaming in an EPS, performing a tracking area update procedure with an EPS update type set to “disaster roaming update”; transmitting the capability information during the tracking area update procedure; receiving a response message. ## Claims ### Claim 1 An operation method of user equipment (UE), comprising if the UE supports a minimization of service interruption (MINT)-evolved packet system (EPS), setting a MINT-EPS bit to “MINT-EPS supported” in capability information; upon selecting a public land mobile network (PLMN) for disaster roaming in an EPS, performing a tracking area update procedure with an EPS update type set to “disaster roaming update”; transmitting the capability information during the tracking area update procedure; receiving a response message, wherein if the response message is a tracking area update accept message, the tracking area update accept message includes at least one a disaster roaming wait range and a disaster return wait range, and wherein if the response message is a tracking area update reject message, the tracking area update reject message includes a cause value to “roaming not allowed in this tracking area” and includes the disaster return wait range; generating a first random number within the disaster roaming wait range; starting a first timer based on the generated first random number; generating a second random number with the disaster return wait range; starting a second timer with the generated second random number value; and upon expiry of the second timer based on the disaster return wait range, not starting the second timer with the disaster return wait range again until the UE selects any PLMN for a disaster roaming service, wherein upon determining that a disaster condition has ended, the UE stops the first timer based on the disaster roaming wait range and performs a PLMN selection, except if the UE already selected an allowable PLMN. ### Claim 2 (depends on 1) The method of claim 1, wherein while the first timer is running, the UE does not initiate an attach procedure on a selected public land mobile network (PLMN), except if the UE needs to request a packet data network (PDN) connection for an emergency bearer service. ### Claim 3 (depends on 1) The method of claim 1, wherein while the second timer is running, the UE does not initiate a registration procedure on a selected first PLMN, except if the UE needs to request an emergency protocol data unit (PDU) session in which case the UE initiates a registration procedure. ### Claim 4 (depends on 1) The method of claim 1, further comprising: upon expiration of the first timer, if the UE does not have a PDN connection for an emergency bearer service, performing an attach procedure for a disaster roaming service if still camped on a selected PLMN. ### Claim 5 A user equipment (UE), the UE comprising: at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising: if the UE supports a minimization of service interruption (MINT)-evolved packet system (EPS), setting a MINT-EPS bit to “MINT-EPS supported” in capability information; upon selecting a public land mobile network (PLMN) for disaster roaming in an EPS, performing a tracking area update procedure with an EPS update type set to “disaster roaming update”; transmitting the capability information during the tracking area update procedure; receiving a response message, wherein if the response message is a tracking area update accept message, the tracking area update accept message includes at least one a disaster roaming wait range and a disaster return wait range, and wherein if the response message is a tracking area update reject message, the tracking area update reject message includes a cause value to “roaming not allowed in this tracking area” and includes the disaster return wait range; generating a first random number within the disaster roaming wait range; starting a first timer based on the generated first random number; generating a second random number with the disaster return wait range; starting a second timer with the generated second random number value; and upon expiry of the second timer based on the disaster return wait range, not starting the second timer with the disaster return wait range again until the UE selects any PLMN for a disaster roaming service, wherein upon determining that a disaster condition has ended, the UE stops the first timer based on the disaster roaming wait range and performs a PLMN selection, except if the UE already selected an allowable PLMN. ### Claim 6 (depends on 5) The UE of claim 5, wherein while the first timer is running, the UE does not initiate an attach procedure on a selected public land mobile network (PLMN), except if the UE needs to request a packet data network (PDN) connection for an emergency bearer service. ### Claim 7 (depends on 5) The UE of claim 5, wherein while the second timer is running, the UE does not initiate a registration procedure on a selected first PLMN, except if the UE needs to request an emergency protocol data unit (PDU) session in which case the UE initiates a registration procedure. ### Claim 8 (depends on 5) The UE of claim 5, wherein the operations further comprise: upon expiration of the first timer, if the UE does not have a PDN connection for an emergency bearer service, performing an attach procedure for a disaster roaming service if still camped on a selected PLMN. ### Claim 9 A semiconductor chipset, comprising: at least one processor; and at least one memory capable of storing instructions and being connected electrically to the at least one processor operably, wherein operations, performed when the instructions are executed by the at least one processor, includes: if an UE supports a minimization of service interruption (MINT)-evolved packet system (EPS), setting a MINT-EPS bit to “MINT-EPS supported” in capability information; upon selecting a public land mobile network (PLMN) for disaster roaming in an EPS, performing a tracking area update procedure with an EPS update type set to “disaster roaming update”; transmitting the capability information during the tracking area update procedure; receiving a response message, wherein if the response message is a tracking area update accept message, the tracking area update accept message includes at least one a disaster roaming wait range and a disaster return wait range, and wherein if the response message is a tracking area update reject message, the tracking area update reject message includes a cause value to “roaming not allowed in this tracking area” and includes the disaster return wait range; generating a first random number within the disaster roaming wait range; starting a first timer based on the generated first random number; generating a second random number with the disaster return wait range; starting a second timer with the generated second random number value; and upon expiry of the second timer based on the disaster return wait range, not starting the second timer with the disaster return wait range again until the UE selects any PLMN for a disaster roaming service, wherein upon determining that a disaster condition has ended, the UE stops the first timer based on the disaster roaming wait range and performs a PLMN selection, except if the UE already selected an allowable PLMN. ### Claim 10 (depends on 9) The semiconductor chipset of claim 9, wherein while the first timer is running, the UE does not initiate an attach procedure on a selected public land mobile network (PLMN), except if the UE needs to request a packet data network (PDN) connection for an emergency bearer service. ### Claim 11 (depends on 9) The semiconductor chipset of claim 9, wherein while the second timer is running, the UE does not initiate a registration procedure on a selected first PLMN, except if the UE needs to request an emergency protocol data unit (PDU) session in which case the UE initiates a registration procedure. ### Claim 12 (depends on 9) The semiconductor chipset of claim 9, wherein the operations further comprise: upon expiration of the first timer, if the UE does not have a PDN connection for an emergency bearer service, performing an attach procedure for a disaster roaming service if still camped on a selected PLMN.