AMF Context Transfer for Secondary Base Station Handover
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Solution Overview
Problem
In dual connectivity wireless communication systems, when a fault occurs in the connection between a master base station and user equipment, the service is interrupted, leading to poor user experience due to the need for re-establishing sessions with significant signaling overhead and long recovery times.
Innovation Solution
A method and apparatus that enable the access and mobility management function network element to quickly establish a connection with a secondary base station by sending a mobility management context, allowing for seamless service transmission and improving user experience by bypassing the failed master base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE re-establishes a session when the master base station cannot continue to provide service, then the service connection can be restored, but the process requires extra signaling overheads and takes a relatively long time
Solution Approach 1:
The patent pre-establishes a connection between the AMF and the secondary base station before the master base station fails. The mobility management context is pre-configured and stored at the AMF, ready for immediate transfer. When failure occurs, the AMF can instantly send the pre-prepared mobility management context to the secondary base station, bypassing the lengthy session re-establishment procedure and achieving rapid service restoration
Solution Approach 2:
The patent introduces the AMF as an intermediary that maintains a direct connection with the secondary base station. This intermediary holds the mobility management context and can rapidly transfer it when the master base station fails, eliminating the need for the UE to initiate a full session re-establishment procedure and significantly reducing recovery time
2Reliability
If the UE re-establishes a session when the master base station cannot continue to provide service, then the service connection can be restored, but extra signaling overheads are required
Solution Approach 1:
The patent extracts the mobility management context from the normal session re-establishment signaling flow and stores it separately at the AMF in advance. When the master base station fails, this pre-extracted context can be directly transferred to the secondary base station without requiring the UE to generate and process extensive re-establishment signaling, thereby reducing signaling overhead while ensuring service restoration
Data Source
AI summary
A service transmission method and apparatus are provided to establish a connection between an access and mobility management function network element and a secondary base station, when a master base station is not capable of continuing to provide a service for a terminal device. In an embodiment, an access and mobility management function network element determines that a master base station is not capable of continuing to provide a service for a terminal device. The access and mobility management function network element sends a mobility management context of the terminal device to a secondary base station, where the mobility management context is used by the secondary base station to perform mobility management on the terminal device. Therefore, a signaling connection between the access and mobility management function network element and the secondary base station can be quickly established, thereby ensuring service transmission and improving user experience.