Conditional Serving Cell Change With Stored UE Reconfiguration
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Solution Overview
Problem
Existing 3GPP Rel-18 specifications lack support for configuring a UE with conditional reconfigurations for the current serving cell, leading to unnecessary reconfigurations and increased signaling overhead during cell group changes.
Innovation Solution
The method involves configuring a UE with conditional reconfigurations where the target candidate cell is the current serving cell, allowing the UE to store and monitor these configurations during cell changes, thereby reducing the need for additional reconfigurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE releases conditional reconfigurations upon completing random access to a target PSCell, then the device complexity is reduced, but the signaling overhead increases during subsequent cell group changes
Solution Approach 1:
The patent implements a mechanism where conditional reconfigurations are temporarily discarded upon random access completion, then recovered and reused when the same source PSCell becomes a target candidate again. This avoids permanent loss of valuable configuration data while managing device complexity.
Solution Approach 2:
The network pre-configures conditional reconfigurations for potential future cell changes. By preparing these configurations in advance and enabling their retention, the system avoids the need for重新配置 during subsequent cell group changes, reducing signaling overhead.
2Loss of information
If the UE stores conditional reconfigurations for the current serving cell, then the signaling overhead is reduced, but the device complexity increases
Solution Approach 1:
The patent applies different retention policies to different conditional reconfigurations based on their target cells. Configurations for the current serving cell are retained, while others are released. This localized quality approach optimizes the balance between signaling overhead and device complexity.
Solution Approach 2:
The UE autonomously determines which conditional reconfigurations to retain based on whether the target cell matches the current serving cell, without requiring continuous network instructions. This self-service mechanism reduces signaling overhead while managing complexity through UE-side logic.
3Stability of the object's composition
If the UE releases conditional reconfigurations after cell change, then the configuration consistency is maintained, but the productivity decreases due to repeated reconfigurations
Solution Approach 1:
Instead of permanently discarding conditional reconfigurations, the system recovers them when needed. This allows the UE to reuse valid configurations for repeated cell group changes, improving productivity while maintaining consistency through selective recovery rather than unconditional retention.
Solution Approach 2:
The conditional reconfigurations are periodically evaluated and reused in subsequent cell group changes. This periodic action pattern allows the system to maintain configuration consistency while efficiently handling multiple cell changes without repeated reconfiguration signaling.
Data Source
AI summary
A method is performed by a user equipment. The method comprises associating a stored configuration for a first serving cell with a condition for executing a cell change procedure to the first cell. The method further comprises, after executing a cell change procedure away from the first cell, monitoring the condition.