Conditional Handover Logic for Successive Wireless Cell Changes
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Solution Overview
Problem
Existing handover procedures in wireless communication systems do not support successive handovers, as user equipment (UE) removes all stored candidate cell configurations after completing a handover, leading to potential interruptions and reduced mobility reliability, especially in scenarios with frequent cell changes due to high-frequency deployments.
Innovation Solution
Implementing a conditional cell addition/change procedure that allows UE to maintain and evaluate execution conditions for candidate cells, enabling successive handovers by storing candidate cell configurations and applying them when specific conditions are met, thereby reducing interruption time and improving mobility reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If UE removes all stored candidate cell configurations after handover completion, then handover procedure is simplified, but mobility reliability deteriorates and successive handovers are not supported
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate cells with their configurations and execution conditions before handover. The UE stores these candidate cell configurations and evaluates their execution conditions, enabling the UE to quickly execute successive handovers without needing to reconfigure cells each time, thus improving mobility reliability while managing complexity.
2Reliability
If UE stores multiple candidate cell configurations for successive handovers, then mobility reliability improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the candidate cell management into distinct components: candidate cell configurations (cell identity, frequency, bandwidth, etc.), execution conditions (signal quality thresholds, event triggers), and evaluation logic. This segmentation allows the UE to systematically manage multiple candidate cells without overwhelming complexity, as each candidate cell is handled as a structured unit with defined attributes and conditions.
3Loss of time
If UE evaluates execution conditions for candidate cells in real-time, then handover timing is optimized reducing interruption time, but processing complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously evaluate execution conditions for candidate cells based on real-time measurements of signal quality, cell identity, and configured thresholds. The UE independently determines when execution conditions are met and triggers handover without continuous network control, reducing handover interruption time while the structured evaluation framework manages processing complexity.
Data Source
AI summary
In wireless communication, a device may change, add, or handover between providers (e.g. nodes) of network access. This may include a conditional cell addition/change procedure and/or a conditional handover procedure. Execution conditions with candidate cell information and configurations may be used for selecting a target cell for the handover to reduce interruption time and improve reliability.