UE PLMN Selection for Disaster Roaming
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Solution Overview
Problem
Existing methods do not define how a user equipment (UE) should select and request disaster roaming services when multiple forbidden public land mobile networks (FPLMNs) and public land mobile networks with disaster conditions (PLMNs-D) are available in an area.
Innovation Solution
The UE detects a disaster condition and identifies FPLMNs broadcasting PLMNs-D. It then selects the highest priority PLMN-D based on a predefined priority order and camps on the corresponding FPLMN, triggering a registration procedure while indicating the selected PLMN-D in the registration request message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE selects a PLMN-D from multiple available FPLMNs broadcasting different PLMN-Ds, then the UE can receive disaster roaming services, but there is no predefined priority order to guide the selection process
Solution Approach 1:
The patent pre-configures a priority order list in the UE that ranks different PLMN-Ds based on their importance and service quality. When a disaster occurs and the UE needs to select a network, it directly references this pre-established priority list to quickly identify the most appropriate PLMN-D to camp on, eliminating the need for complex real-time decision-making and reducing service acquisition time.
Solution Approach 2:
The patent introduces a new parameter dimension for PLMN selection by assigning priority levels to different PLMN-Ds. Instead of treating all PLMN-Ds equally, the system changes the selection criterion from simple availability to priority-based ranking, allowing the UE to systematically compare and select the highest priority PLMN-D among multiple options.
2Reliability
If the UE camps on an FPLMN to receive disaster roaming services, then the UE can maintain service connectivity, but the UE must be forbidden from accessing the original serving PLMN-D
Solution Approach 1:
The patent segments the PLMN selection process into distinct phases: normal operation mode and disaster roaming mode. During normal operation, the UE follows standard PLMN selection rules. When a disaster is detected, the system transitions to disaster roaming mode where the pre-configured priority order list becomes active, and the UE is directed to camp on a different PLMN-D from the forbidden list, separating the decision-making logic into context-specific pathways.
Solution Approach 2:
The patent introduces a priority order list as an intermediary mechanism that mediates between the UE and multiple available FPLMNs. This intermediary structure provides a clear, predefined hierarchy that guides the UE's selection process, reducing the complexity of real-time decision-making by replacing it with a straightforward lookup and selection based on the pre-established priority rankings.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The embodiment herein is to disclose a method for selecting PLMN with disaster condition (PLMN-D) to receive disaster roaming service in an area. The method includes detecting, by a UE, a disaster condition in the area. Further, the method includes detecting, by the UE, a forbidden PLMN (FPLMN) broadcasting a plurality of PLMN-Ds in the area. Further, the method includes selecting, by the UE, the at least one PLMN-D from the plurality of PLMN-D based on a predefined sequence of priority order. Further, the method includes camping, by the UE, the FPLMN corresponding to the at least one selected PLMN-D. Further, the method includes triggering, by the UE, a registration procedure on the camped FPLMN by indicating the at least one selected PLMN-D in the registration request message.