Cell Group Change Handover Mechanism
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Solution Overview
Problem
Existing wireless communication systems experience traffic interruption during cell group (CG) changes due to the 'break before make' concept, where the connection with the source CG must be released before establishing a connection with the target CG.
Innovation Solution
A method for wireless communication that allows a user equipment (UE) to maintain a connection with both source and target CGs during a handover, using target cell group setup information to connect to the target CG while still connected to the source CG, and then disconnecting from the source CG once the handover is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the 'break before make' concept is used for cell group changes, then the connection establishment is simplified and reliable, but traffic interruption occurs during handover
Solution Approach 1:
The target cell group configuration is prepared and signaled to the UE before the actual handover execution. The network provides advance notice of the upcoming CG change, allowing the UE to prepare reception parameters in advance, thereby maintaining traffic flow without interruption while ensuring reliable connection establishment.
Solution Approach 2:
The patent enables the UE to maintain simultaneous connection to both source and target cell groups during the handover transition period. By allowing overlapping connections, the useful action of data transmission continues uninterrupted, resolving the contradiction between connection reliability and traffic continuity.
2Productivity
If simultaneous connection to source and target CGs is allowed during handover, then traffic interruption is prevented, but connection management complexity increases
Solution Approach 1:
The network acts as an intermediary that manages the complexity of simultaneous connections. Through network-controlled signaling and configuration, the UE is guided through the complex handover process, simplifying the UE's task while maintaining traffic continuity and enabling overlapping connections.
3Ease of manufacture
If the source CG connection is released before target CG connection is established, then connection establishment is straightforward, but communication traffic is interrupted
Solution Approach 1:
The target cell group configuration is prepared and signaled in advance before the handover execution. This preliminary preparation allows the UE to maintain existing source CG connection while simultaneously establishing the target CG connection, eliminating traffic interruption and avoiding the need to choose between simplicity and continuity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may connect to a set of source cell groups (CGs). The UE may receive a target cell group setup information, the target cell group setup information being associated with a set of target CGs. The UE may connect to the set of target CGs based at least in part on the target cell group setup information during a handover from the set of source CGs to the set of target CGs. The UE may disconnect from the set of source CGs after connecting to the set of target CGs. Numerous other aspects are provided.