Emergency Cell Reselection Using Barring and Deprioritization
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Solution Overview
Problem
Existing wireless communication systems do not effectively manage cell selection and reselection for emergency services, leading to potential ping-pong effects and battery drain due to frequent SIB decoding when a UE is camped on a cell that does not support emergency calls, despite having better channel conditions.
Innovation Solution
Implement a method and apparatus for UE to detect current cell support for emergency services, apply barring or deprioritization timers, and allow cell selection/reselection on cells that support emergency services, thereby avoiding cells that do not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs cell selection and reselection based on channel conditions alone, then the UE can maintain good connection quality, but the UE may frequently reselect to cells that do not support emergency services, causing ping-pong effects and battery drain
Solution Approach 1:
The patent applies preliminary action by checking whether a cell supports emergency services before the UE performs cell reselection. The network provides emergency service support information in system information blocks, allowing the UE to pre-filter candidate cells and avoid reselecting to cells that cannot support emergency calls, thereby preventing unnecessary reselections and conserving battery power.
Solution Approach 2:
The patent implements feedback by having the network continuously broadcast emergency service support status in system information blocks. The UE uses this feedback information to make informed cell reselection decisions, ensuring that reselection targets are both channel-quality-optimal and emergency-service-capable, thus avoiding ping-pong effects between incompatible cells.
2Measurement precision
If the UE frequently monitors and decodes SIB to evaluate cell reselection criteria, then the UE can make accurate reselection decisions, but the UE experiences battery drain due to continuous monitoring
Solution Approach 1:
The patent extracts the emergency service support information from the complete SIB content and uses it as a primary filtering criterion before performing full cell evaluation. This allows the UE to quickly dismiss cells that cannot support emergency services without conducting comprehensive measurements and decodings, significantly reducing the frequency and intensity of SIB monitoring while maintaining accurate reselection decisions.
3Speed
If the UE reselects to cells with better channel conditions, then the UE can improve communication quality, but the UE may lose emergency service capability when reselecting to non-emergency-supporting cells
Solution Approach 1:
The patent applies local quality by differentiating cell evaluation into two distinct quality dimensions: channel quality and emergency service support capability. The UE first filters cells based on emergency service support (a local quality requirement), then performs channel quality optimization within the remaining subset. This ensures that emergency service capability is never compromised in the pursuit of better channel conditions.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure provides methods for supporting emergency service in wireless network (1000) by UE (100). In an embodiment, when a current cell on which the UE (100) is camped. does not support the emergency service. the method includes executing for the current cell or a frequency of the current cell at least one of: barring the current cell or the frequency of the current cell and starting one of a cell barring timer for the barred current cell or a frequency barring timer for the barred frequency of the current cell. Further, the method includes deprioritizing the current cell or the frequency of the current cell with a lowest priority for performing cell selection or cell reselection. Further, the method includes allowing the UE to perform the cell selection or cell reselection on cells other than the current cell or the frequency of the current cell.