AMF UE Context Transfer for Disaster Roaming Registration
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Solution Overview
Problem
Existing systems fail to determine the PLMN with a disaster condition during UE registration, leading to potential rejection of disaster roaming services by new AMFs without proper assessment.
Innovation Solution
The method involves the old AMF storing the PLMN with disaster condition information in the UE context and transmitting this information to the new AMF, allowing it to make informed decisions on accepting or rejecting disaster roaming requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the new AMF does not receive disaster condition information from the old AMF, then the system operation is simpler, but the new AMF cannot accurately determine PLMNs with disaster conditions leading to potential service rejection
Solution Approach 1:
The old AMF stores the PLMN with disaster condition information in the UE context before UE mobility occurs, and proactively transfers this information to the new AMF when handover is triggered. This preliminary preparation ensures the new AMF receives complete disaster condition information before needing to make service determination decisions.
Solution Approach 2:
The UE context acts as an intermediary data structure that carries the disaster condition information from the old AMF to the new AMF. By embedding the PLMN with disaster condition information within the UE context transfer message, the system enables reliable information transmission without requiring separate dedicated signaling mechanisms.
2Reliability
If the system transfers complete UE context including disaster condition information, then the new AMF can make informed decisions, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the critical PLMN with disaster condition information from the complete UE context and transfers it separately to the new AMF. This selective extraction ensures that essential disaster condition information is preserved and transmitted without the overhead of transferring the entire UE context, balancing information completeness with signaling efficiency.
3Reliability
If the new AMF rejects disaster roaming requests without proper information, then false acceptances are prevented, but legitimate disaster roaming services are unnecessarily blocked
Solution Approach 1:
The new AMF uses the transferred PLMN with disaster condition information as feedback to accurately determine whether the UE is requesting disaster roaming service. By comparing the requested PLMN against the stored disaster condition PLMN information, the new AMF can make informed decisions that prevent false rejections while maintaining service accuracy.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A first access and mobility management function (AMF) receives, from a user equipment (UE), a registration request message including information regarding a public land mobile network (PLMN) with a disaster condition, wherein the information regarding the PLMN with the disaster condition indicates a PLMN of the UE which has faced the disaster condition, stores the information regarding the PLMN with the disaster condition included in the registration request message as a part of a UE context, receives, from a second AMF, a UE context transfer request message, and transmits, to the second AMF, a UE context transfer response message in response to the UE context transfer request message, the UE context transfer response message comprising the UE context.