Handover Apparatus Maintaining Secondary Base Station
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Solution Overview
Problem
In dual connectivity scenarios, handover from a primary base station to another primary base station disrupts service by releasing the secondary base station, causing delays and interruptions in data communication between user equipment and the secondary base station.
Innovation Solution
The target primary base station maintains the source secondary base station unchanged during handover, adding it as the secondary base station for the user equipment both before and after the handover, using secondary base station addition or modification requests to ensure continuous dual connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the source secondary base station is released during handover from source primary base station to target primary base station, then the handover process is simplified, but service continuity is disrupted and user experience deteriorates
Solution Approach 1:
The target primary base station performs preliminary actions by adding the source secondary base station as the secondary base station of the user equipment during the handover process, before the handover is completed. This ensures that dual connectivity is maintained throughout the transition, preventing service interruption while keeping the process manageable.
2Device complexity
If the source secondary base station is released during handover, then resource allocation is simplified, but handover delay increases due to subsequent re-adding operations
Solution Approach 1:
The source secondary base station continues to provide service to the user equipment throughout the entire handover process without being released. The target primary base station maintains dual connectivity by keeping the source secondary base station active, eliminating the need for re-adding operations and thus reducing handover delay while managing resource allocation efficiently.
3Device complexity
If the source secondary base station is released and target secondary base station is added after handover completion, then connection management is simplified, but data communication interruption occurs
Solution Approach 1:
The target primary base station performs the action of adding the source secondary base station as the secondary base station during the handover process itself, rather than after completion. This preliminary action ensures that data communication pathways are maintained continuously, preventing interruptions while keeping connection management straightforward.
Data Source
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AI summary
The present invention provides a handover apparatus and method, to implement that a source secondary base station remains unchanged in a process of handover of user equipment from a primary base station to another primary base station, reduce a delay in the handover process, and avoid an interruption problem of data communication between the user equipment and the source secondary base station in the handover process. The handover method provided in the present invention is as follows: receiving, by a target primary base station, a handover request sent by a source primary base station, where the handover request includes first configuration information of a source secondary base station, and the source primary base station and the source secondary base station jointly provide services for user equipment; sending, by the target primary base station, a first indication to the source secondary base station, where the first indication is used to instruct the source secondary base station to remain unchanged; and sending, by the target primary base station, a handover acknowledgement to the source primary base station, where the handover acknowledgement includes second configuration information of the source secondary base station, and the second configuration information is used to jointly provide services for the user equipment by the target primary base station and the source secondary base station.