DAPS Handover Source Cell Release Timer
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Solution Overview
Problem
The existing Dual Active Protocol Stack (DAPS) handover procedures in wireless communication systems face issues with delayed or missed release messages, leading to increased power consumption and mobility problems due to ongoing radio link monitoring and transmission in both source and target cells, especially when channel conditions are poor or Radio Link Failure is detected.
Innovation Solution
A method and system that monitor channel condition parameters of the target cell during DAPS handover and determine whether to release or retain the source cell connection based on predefined threshold values, ensuring efficient handover by managing DAPS data bearers accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DAPS release message is delayed or missed during handover, then the source cell connection is retained longer, but power consumption increases and mobility issues occur
Solution Approach 1:
The patent applies preliminary action by introducing a timer that starts when the DAPS handover message is received. This timer proactively manages the source cell connection duration without waiting for the release message, thereby preventing excessive power consumption while ensuring reliable handover completion. The timer is configured based on expected handover duration and automatically triggers source cell release if the release message is delayed or missed.
2Productivity
If the source cell connection is retained during DAPS handover, then data transmission continuity is maintained, but mobility performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the source cell connection duration adaptive rather than static. The system dynamically adjusts the retention period based on real-time conditions: if the DAPS release message arrives within the expected timeframe, the source cell connection is released promptly; if delayed or missed, the timer-based mechanism automatically releases the connection after the configured duration, preventing mobility issues while maintaining data continuity during the handover process.
3Measurement precision
If channel condition parameters are monitored continuously, then handover decisions are optimized, but system complexity increases
Solution Approach 1:
The patent applies parameter changes by monitoring specific channel condition parameters (such as signal strength, quality metrics) and using them to trigger handover decisions. The system changes the operational state based on these parameter thresholds: when parameters indicate poor channel conditions, handover is initiated; when parameters show good conditions, the handover process is optimized. This approach achieves precise handover management without excessive system complexity by focusing on key parameters rather than comprehensive monitoring.
Data Source
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AI summary
A method and system for managing source cell connection during a Dual Active Protocol Stack (DAPS) handover with respect to a UE. The method includes establishing, while maintaining DAPS data bearers with a source cell, DAPS data bearers with a target cell during DAPS handover in response to receiving a DAPS handover message from the source cell. The method monitors a plurality of channel condition parameters of the target cell upon successful establishment of the DAPS data bearers with the target cell. Thereafter, the method determines whether a value of each of the monitored plurality of channel condition parameters is more than a respective predefined threshold value, if so, the DAPS data bearers with the source cell are managed.