Radio Link Monitoring Thresholds for High-Speed UE Sync Stability
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Solution Overview
Problem
Existing radio link monitoring mechanisms in wireless cellular networks are inadequate for user equipment (UE) moving at high speeds, such as up to 500 km/hour, as they are based on delay requirements defined for normal speeds, leading to frequent out-of-sync conditions.
Innovation Solution
Redefine the threshold Q_out for radio link monitoring to a value less than 10%, such as 1-9%, and introduce a new threshold Q_out,2 for high-speed scenarios, along with mechanisms to maintain reliable communication by adjusting network components to prevent frequent out-of-sync events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threshold Q_out is set to the standard value (10%) for normal speed scenarios, then the radio link monitoring mechanism works adequately for normal speed UE, but high-speed UE experiences frequent out-of-sync conditions and communication reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by redefining the threshold Q_out from the standard 10% to a lower value (1-9%) specifically for high-speed scenarios. This parameter adjustment allows the radio link monitoring mechanism to adapt to the challenging channel conditions experienced by high-speed UE, reducing false out-of-sync triggers while maintaining adequate monitoring sensitivity.
2Reliability
If the threshold Q_out is reduced to less than 10% for high-speed UE, then out-of-sync triggers are reduced and communication reliability improves, but the monitoring sensitivity may become overly strict for normal conditions
Solution Approach 1:
The patent implements dynamics by making the threshold Q_out configurable and scenario-dependent. The network can dynamically adjust the threshold value based on UE speed conditions, switching between standard (10%) and reduced (1-9%) thresholds as needed. This dynamic approach allows the system to optimize performance for different operational scenarios without requiring permanent complexity.
3Device complexity
If existing radio link monitoring mechanisms are used without modification, then the system maintains simplicity and standard operation, but high-speed UE experiences frequent out-of-sync events and connection failures
Solution Approach 1:
The patent applies local quality by implementing scenario-specific threshold configurations. Instead of uniformly applying the standard 10% threshold to all UE, the system applies different threshold values (1-9%) specifically to high-speed UE identified by their speed characteristics. This localized adjustment maintains simplicity for normal operations while providing targeted improvement for high-speed scenarios.
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AI summary
Some embodiments of this disclosure include systems, apparatuses, methods, and computer-readable media for use in a wireless network for radio link monitoring for high speed user equipment (UE). For example, some embodiments are directed to a user equipment (UE) including radio front end circuitry and processor circuitry coupled to the radio front end circuitry. The processor circuitry can be configured to monitor a downlink associated with a cell using a reference signal and estimate a downlink radio link quality associated with the downlink. The processor circuitry can further be configured to compare the estimated downlink radio link quality with a threshold. The processor circuitry can further be configured to trigger an out-of-sync operation in response to the downlink radio link quality being worse than the threshold. The threshold can include a value less than 10%.