Secondary Cell Session Mapping for Dual Connectivity Handover
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Solution Overview
Problem
In wireless communication systems, particularly in LTE networks, handover procedures between primary and secondary cells face challenges due to the lack of mapping information, leading to difficulties in maintaining seamless connectivity and session continuity during inter-MeNB handovers, as the secondary cell cannot map the old session to the new session without identifying the user equipment.
Innovation Solution
The method involves receiving and providing mapping information, such as user equipment identity information, between primary and secondary cells through messages like secondary node addition or modification requests, allowing the secondary cell to associate connection requests and maintain session continuity during handovers by identifying the user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover procedure is performed between primary cells in dual connectivity, then mobility and connectivity are improved, but session continuity is lost due to lack of mapping information at secondary cell
Solution Approach 1:
The source primary cell performs preliminary actions by including mapping information (such as UE identity, SCG-ECGI, SCG-C-RNTI, PSCell PCI, and X2-AP ID) in the handover request message before the handover occurs. This allows the target primary cell and secondary cell to pre-configure the mapping relationships, ensuring session continuity is maintained during the actual handover execution without information loss.
2Productivity
If mapping information is not provided to secondary cell, then device complexity is reduced, but handover efficiency and session mapping capability deteriorate
Solution Approach 1:
The primary cell acts as an intermediary by collecting and managing the mapping information centrally, then forwarding it to the secondary cell through standardized messages (SecondaryNodeAdditionRequest or SecondaryNodeModificationRequest). This mediator approach enables the secondary cell to obtain necessary mapping information without directly interacting with multiple source nodes, improving handover efficiency while managing information complexity through a centralized coordination point.
Data Source
AI summary
There is provided a method including receiving, at a secondary cell, mapping information from a primary cell and using the mapping information to associate a connection request with a user equipment associated with the secondary cell.