UE PLMN Selection for Disaster Roaming Exit Detection
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Solution Overview
Problem
Existing wireless networks face challenges in efficiently handling Public Land Mobile Network (PLMN) selection during disaster conditions, leading to potential service interruptions and increased costs due to unnecessary signaling and inefficient resource usage.
Innovation Solution
A method and system for a user equipment (UE) to ignore the registered PLMN providing disaster roaming services and quickly search for a higher priority PLMN by determining the end of a disaster condition through non-3GPP access or broadcast changes, allowing efficient PLMN selection and improved battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to use the registered PLMN for disaster roaming, then service continuity is maintained, but service interruptions occur when the disaster condition ends and the UE needs to select a higher priority PLMN
Solution Approach 1:
The UE performs preliminary detection to determine whether the disaster condition has ended by checking if the registered PLMN is still broadcasting disaster-related indications. When the disaster condition is determined to have ended, the UE proactively initiates the PLMN selection procedure before service interruption occurs, thereby transitioning from the disaster roaming PLMN to a higher priority PLMN in advance and avoiding service interruptions.
2Productivity
If the UE performs frequent PLMN selection procedures to find higher priority networks, then network optimization is improved, but battery consumption increases
Solution Approach 1:
Instead of performing PLMN selection procedures frequently or continuously, the UE adopts periodic action by triggering the PLMN selection procedure only at specific moments - when the disaster condition is detected to have ended. This is achieved by monitoring whether the registered PLMN continues to broadcast disaster-related indications, and only initiating network selection when these indications stop, thereby reducing unnecessary energy consumption while maintaining network selection efficiency.
3Speed
If the UE ignores the registered PLMN and performs PLMN selection procedure, then faster network switching is achieved, but unnecessary signaling and resource usage increase when disaster condition continues
Solution Approach 1:
The UE employs feedback mechanism by continuously monitoring the registered PLMN's broadcast information to detect whether the disaster condition has ended. The PLMN selection procedure is triggered based on this feedback - only when the monitoring indicates that disaster-related indications are no longer broadcast. This feedback-based approach ensures that the UE switches networks only when necessary, avoiding unnecessary signaling and resource usage while maintaining fast switching capability when needed.
Data Source
AI summary
The disclosure relates to a 5th generation (5G) or 6th generation (6G) communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes, at switch-on or recovery from a lack of a coverage, identifying that a registered public land mobile network (PLMN) is a PLMN with which the UE is registered for a disaster roaming, and performing a PLMN selection procedure, based on the identification, wherein the registered PLMN is ignored during the PLMN selection procedure.