Cell Reselection Criteria Adaptation for Barred Serving Cells
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) cannot perform cell reselection when a serving cell becomes barred, as existing methods do not provide a relaxed criterion for reselecting a third cell, leading to inability to handover to a target cell with better signal quality.
Innovation Solution
A method that allows user equipment to evaluate and select a second cell using less strict judging conditions for cell reselection when the serving cell is barred, enabling handover to a suitable or acceptable cell even if the serving cell's signal strength remains higher than threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE follows the existing cell reselection criterion when the serving cell is barred, then the UE maintains strict reselection conditions, but the UE cannot handover to a target cell with better signal quality
Solution Approach 1:
The patent applies dynamics by making the cell reselection criterion adaptive rather than static. When the serving cell is barred, the UE dynamically switches from a first cell reselection criterion to a second, more relaxed cell reselection criterion. This dynamic adjustment allows the reselection conditions to change based on the serving cell's barred status, enabling the UE to handover to target cells with better signal quality when necessary while maintaining strict conditions when the serving cell is acceptable.
2Measurement precision
If the UE uses the first cell reselection criterion when the serving cell is barred, then the reselection conditions remain strict, but the UE loses the ability to reselect to better cells
Solution Approach 1:
The patent implements dynamics by enabling the UE to switch between different cell reselection criteria based on the serving cell's barred status. When barred, the UE transitions to a second criterion with relaxed conditions, making cell reselection operation easier and enabling handover to better cells. When the serving cell is not barred, the UE uses the first criterion with precise measurement requirements.
3Reliability
If the network sets the serving cell as barred, then the UE is forbidden to camp on the current cell, but the UE cannot find an alternative cell under strict reselection criteria
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the reselection criterion based on the barred status. When the network bars the serving cell, the UE switches to the second, more relaxed criterion, which improves cell reselection efficiency and enables the UE to quickly find alternative cells. This dynamic adjustment maintains network control reliability while preventing productivity loss during barred scenarios.
Data Source
AI summary
When camping on a serving cell which is not barred from cell selection/reselection, a user equipment is configured to evaluate whether a cell reselection procedure should be performed based on first cell reselection criterion. If the serving cell is barred from cell selection/reselection by the network when the user equipment is currently camping on the serving cell, the user equipment is configured to evaluate whether the cell reselection procedure should be performed based on a second cell reselection criteria. The judging conditions of the second cell reselection criterion are less strict than the judging conditions of the first cell reselection criterion.