Disaster Roaming PLMN Access for Emergency Service Continuity
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Solution Overview
Problem
When a base station failure occurs in a Public Land Mobile Network (PLMN), there is no established method for another PLMN to provide emergency services to subscribers of the affected network, leading to potential disruptions in critical communications like emergency calls.
Innovation Solution
A method where a User Equipment (UE) subscribed to a first PLMN can detect a service failure and automatically switch to a second PLMN for network access, with the second PLMN broadcasting system information of the first PLMN to facilitate seamless roaming and emergency service provision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE subscribed to a first PLMN attempts to access the network after base station failure, then the UE can maintain emergency service connectivity, but the network load on the second PLMN increases and service continuity may be disrupted without proper roaming mechanisms
Solution Approach 1:
The network node pre-configures disaster roaming information including the second PLMN's network identifier and access parameters before the actual failure occurs. When base station failure is detected, the UE can immediately utilize this pre-configured information to access the second PLMN without complex real-time negotiations, ensuring rapid emergency service connectivity while simplifying the access management process
Solution Approach 2:
The network node acts as an intermediary by providing the UE with disaster roaming information that includes the second PLMN's network identifier. This intermediary mechanism facilitates the handover from the failed first PLMN to the second PLMN, managing the complexity of inter-PLMN access through a centralized information distribution approach rather than direct UE-network negotiation
2Adaptability or versatility
If the second PLMN broadcasts system information of the first PLMN to facilitate roaming, then seamless emergency service provision is enabled, but the information management complexity and potential for confusion increases
Solution Approach 1:
The system applies different information characteristics to different contexts: when the second PLMN broadcasts system information for the first PLMN, it includes specific disaster roaming indicators and network identifiers that locally mark this as emergency disaster roaming information. This local quality differentiation allows UEs to distinguish between normal and disaster roaming scenarios, maintaining adaptability while preventing information confusion
Solution Approach 2:
The network node serves as an intermediary that carefully manages the broadcasting of system information. It selects and filters which first PLMN information to broadcast to the second PLMN, ensuring that only appropriate disaster roaming information is shared. This intermediary control maintains accurate network identification while enabling seamless roaming capability
3Productivity
If the UE automatically switches to the second PLMN upon detecting service failure, then service continuity is maintained, but the risk of incorrect switching and service disruption increases
Solution Approach 1:
The network node pre-distributes disaster roaming information including the second PLMN's network identifier and access parameters to UEs before failure occurs. When service failure is detected, the UE can automatically switch to the second PLMN using this pre-configured information, achieving rapid service restoration without compromising accuracy since the target network was pre-validated by the network node
Solution Approach 2:
The system implements feedback mechanisms where the network node monitors UE access attempts to the second PLMN and can provide corrective information or guidance. If switching errors occur, the network node receives feedback and can adjust the disaster roaming information distribution, thereby improving switching accuracy while maintaining fast service restoration
Data Source
AI summary
One disclosure of the present specification provides a method by which a terminal that joined a first public land mobile network (PLMN) performs a connection. The method may comprise a step for transmitting a first request message to a network node through a base station. The base station may be a base station of a second PLMN that broadcasts system information including information about the first PLMN. The method may comprise a step for receiving, from the network node, a first acceptance message for the first request message. The first acceptance message may include information indicating that there is a service failure in the first PLMN. The method may comprise a step for displaying, on a screen of the terminal, information indicating that the terminal is connected to the second PLMN on the basis of the information.