Disaster Roaming for User Equipment in Communication Systems
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Solution Overview
Problem
Current communication systems lack effective methods to inform user equipment (UE) about disaster conditions, leading to service interruptions and congestion when disaster conditions impact radio access networks, preventing seamless disaster roaming and efficient resource allocation.
Innovation Solution
A method and apparatus that enable UE to identify disaster conditions and perform disaster roaming by notifying the UE of impacted access types, providing location and time information, and recommending actions to avoid congestion, such as transferring PDU sessions to non-impacted access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network provides disaster roaming service to UEs in affected areas, then service continuity is improved, but network congestion increases
Solution Approach 1:
The network notifies UEs about disaster conditions and provides pre-configured alternative PLMN lists before congestion occurs. UEs are prepared in advance with knowledge of available roaming networks and can immediately switch without waiting for network guidance, reducing the peak congestion load on the primary network.
Solution Approach 2:
The network provides feedback to UEs about the disaster condition status and available roaming options. This feedback mechanism enables UEs to make informed decisions about network selection and can dynamically adjust their behavior based on real-time network conditions, helping to distribute load more effectively.
2Ease of operation
If the network provides detailed disaster condition information to UEs, then UE autonomous decision-making is improved, but network signaling overhead increases
Solution Approach 1:
The network provides disaster condition information selectively based on UE location and current network status. Instead of broadcasting to all UEs, the system identifies affected areas and targets notifications to UEs in those specific locations, reducing overall signaling overhead while maintaining effective communication with impacted users.
Solution Approach 2:
The network provides essential disaster condition information and alternative PLMN lists to UEs, but does not provide every possible detail about network conditions or roaming procedures. This partial information approach enables sufficient autonomous decision-making by UEs while minimizing the amount of network signaling required.
3Device complexity
If the network waits for UE registration failure before providing disaster roaming, then network configuration simplicity is improved, but service interruption duration increases
Solution Approach 1:
The network is configured in advance with alternative PLMN lists and disaster roaming parameters before actual disaster conditions occur. When a disaster is detected, the network can immediately activate these pre-configured settings without waiting for registration failures or complex real-time configuration, significantly reducing service interruption time.
Solution Approach 2:
The network prepares and stores alternative PLMN configuration data in advance as a cushion against potential disaster conditions. This pre-prepared configuration allows the network to respond instantly to disaster events without the delay of real-time configuration decisions, buffering against the complexity of reactive network management.
Data Source
AI summary
A method of a user equipment (UE) is provided. The method includes identifying a disaster condition for a first network, identifying whether the UE is in a registered state and a connected state over a first access based on the identified disaster condition, and performing a disaster roaming based on an identification that the UE is not in the registered state and the connected state over the first access.