UE Barred Cell Timer Handover Failure Mitigation
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Solution Overview
Problem
Continuous handover or redirection failures in wireless communication systems lead to increased signaling overhead, disrupted service, and reduced performance for user equipment (UE), particularly when attempting to access barred cells or cells associated with forbidden tracking area codes (TACs).
Innovation Solution
A user equipment (UE) autonomously refrains from transmitting signal metrics associated with barred cells or cells within forbidden TACs, even if the signal metrics satisfy quality thresholds, based on the state of a barred cell timer or forbidden TAC indications, thereby mitigating repeated handover and redirection attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits signal metrics for barred cells or cells with forbidden TACs, then the network can perform handover or redirection, but continuous handover or redirection failures occur leading to increased signaling overhead and disrupted service
Solution Approach 1:
The UE checks whether a cell is barred or associated with a forbidden TAC before transmitting measurement reports. This preliminary check prevents the UE from reporting signal metrics for cells that are known to be inaccessible, thereby avoiding continuous handover failures and reducing signaling overhead while maintaining reliable handover to valid cells
2Adaptability or versatility
If the UE continuously attempts handover to barred cells, then the UE can potentially access alternative cells, but service disruption increases and performance deteriorates
Solution Approach 1:
The UE uses feedback information about barred cells and forbidden TACs to adjust its measurement and reporting behavior. By incorporating this feedback, the UE avoids repeatedly attempting handover to inaccessible cells, thereby maintaining service continuity while still adapting to available network conditions through selective measurement of accessible cells
3Loss of information
If the UE measures and reports signal metrics for all cells including barred cells, then the network has complete information, but futile handover attempts consume battery life and reduce data throughput
Solution Approach 1:
The UE applies different measurement and reporting strategies based on cell characteristics. For barred cells or cells with forbidden TACs, the UE refrains from transmitting signal metrics. For accessible cells, the UE continues to measure and report normally. This localized differentiation maintains necessary network information while avoiding futile handover attempts that would consume battery life
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, prior to expiration of a barred cell timer that is associated with a barred cell, a measurement configuration that indicates to measure a frequency that is associated with the barred cell. The UE may compute that a signal metric associated with the frequency and the barred cell satisfies a quality threshold. The UE may selectively refrain from transmitting the signal metric based at least in part on a state of the barred cell timer. Numerous other aspects are described.