Handover Command Handling for Simultaneous Connectivity
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing simultaneous connectivity handovers between multiple target cells, leading to increased signaling overhead and potential data interruptions during handover processes.
Innovation Solution
The proposed solution involves optimizing command handling for simultaneous connectivity handovers by using a single HO command that overrides previous commands, or by maintaining multiple HO command states until exit conditions are met, thereby reducing signaling overhead and improving handover robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple handover commands are sent to the UE for simultaneous connectivity handovers, then handover robustness is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple handover commands into a single message structure that can carry multiple target cell configurations. The source gNB sends a unified handover command containing conditional handover information for multiple target cells, reducing the number of separate signaling messages while maintaining the ability to support simultaneous handovers to multiple cells.
Solution Approach 2:
The patent implements conditional handover where the UE receives and stores multiple handover commands in advance, but only executes them when specific conditions are met (e.g., when signal quality of target cells falls below thresholds). This preliminary preparation allows the system to reduce signaling overhead by not sending redundant commands while maintaining robustness through pre-configured fallback options.
2Reliability
If multiple handover commands are maintained until exit conditions are met, then handover robustness is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic condition monitoring where the UE continuously evaluates signal quality against predefined thresholds for each target cell. The handover command execution is dynamic - commands are held in a ready state and automatically triggered or cancelled based on real-time conditions, simplifying the management complexity compared to static command handling while maintaining robustness.
Solution Approach 2:
The system implements feedback mechanisms where the UE monitors handover conditions and provides status information back to the network. This feedback loop allows the network to track which handover commands are active and adjust configurations accordingly, reducing the burden on the UE to independently manage complex command states while ensuring robust handover execution.
3Device complexity
If traditional handover processes are used, then system simplicity is maintained, but data interruption occurs during handover
Solution Approach 1:
The patent implements make-before-break handover where the UE establishes connectivity with the target cell before releasing the source cell connection. The conditional handover commands are prepared in advance, and when conditions are met, the UE seamlessly switches to the target cell without interrupting data flow, achieving near-zero interruption time while maintaining reasonable system complexity.
Data Source
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AI summary
Methods, systems, and storage media are described for command handling for simultaneous connectivity handovers. Other embodiments may be described and/or claimed.