Conditional Reconfiguration for Wireless Handover Reliability
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Solution Overview
Problem
In wireless communication systems, handover failures and radio link failures due to outdated candidate cells in high-frequency scenarios and high-speed user equipment (UE) movement lead to inefficient resource allocation and poor user experience, as current mechanisms do not account for changes in channel quality or the competence of neighboring cells.
Innovation Solution
A method of conditional reconfiguration in user equipment (UE) that allows for dynamic modification of candidate cells by transmitting notifications to the network upon fulfillment of release conditions, enabling the release of incompetent cells and addition of competent neighbor cells, based on measurement results and predefined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If candidate cells are configured in advance for handover, then handover preparation is improved, but the candidate cells become outdated due to fast fading and high-speed UE movement
Solution Approach 1:
The patent applies dynamics by making the candidate cell list dynamic rather than static. The UE continuously monitors channel quality and UE movement status, and the network dynamically updates the candidate cell list based on real-time conditions. This resolves the contradiction by allowing the system to adapt to changing conditions while maintaining preparation benefits.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports measurement results and channel quality information to the network, and the network uses this feedback to update the candidate cell list. This continuous feedback loop ensures that outdated cells are replaced with current, suitable candidates, resolving the reliability issue.
2Adaptability or versatility
If candidate cells are reserved for handover, then handover capability is improved, but resources are wasted when candidate cells become outdated
Solution Approach 1:
The patent applies discarding and recovering by removing outdated candidate cells from the list and recovering their associated resources for reuse. When a candidate cell becomes outdated due to channel fading or UE movement, the system discards it and its reserved resources, then reallocates these resources to current suitable cells, preventing waste while maintaining handover capability.
Solution Approach 2:
The dynamic update mechanism allows the system to adapt the candidate cell list in real-time, discarding outdated entries and adding new suitable cells. This dynamic approach ensures resources are not wasted on incompetent cells while maintaining the system's ability to perform handovers when needed.
3Device complexity
If the network maintains outdated candidate cells, then configuration simplicity is improved, but handover failure risk increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously monitor channel quality and report when candidate cells become outdated. The UE automatically triggers updates to the candidate cell list without requiring constant network intervention, maintaining simplicity while improving reliability through UE-initiated optimizations.
Solution Approach 2:
The feedback mechanism where the UE reports measurement results and channel quality allows the network to maintain simple configurations while automatically updating candidate cells based on real-time conditions. This feedback loop resolves the contradiction by enabling automatic adaptation without complex manual reconfiguration.
4Device complexity
If the network does not monitor candidate cell status, then system complexity is reduced, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies self-service by having the UE perform measurements and monitoring of candidate cell status autonomously. The UE reports this information to the network, which then automatically updates the candidate list. This distributes the monitoring function to the UE level, reducing network complexity while improving resource allocation efficiency through informed decision-making.
Solution Approach 2:
The system performs preliminary actions by having the UE continuously measure and report on candidate cell conditions before handover is needed. This advance monitoring and reporting allows the network to proactively update the candidate list, improving resource allocation efficiency without requiring complex real-time intervention during critical handover moments.
Data Source
AI summary
Provided are a method of conditional reconfiguration and a user equipment (UE) using the same. The method is adapted to a user equipment and includes the following steps. A conditional reconfiguration including at least one candidate cell is received. A notification to network is transmitted in response to a release condition corresponding to one of the at least one candidate cell is fulfilled.