Stopping RLF Timer During Conditional Mobility Execution
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively handling timers related to radio link failure (RLF) during conditional mobility, leading to potential service interruptions and RRC connection recovery issues.
Innovation Solution
A method and apparatus for a wireless device to receive a conditional mobility command with a mobility execution condition for a target cell, detect when the entering condition of the mobility execution condition is satisfied while a timer is running, and stop the timer accordingly, allowing for seamless mobility to the target cell without RLF declaration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the timer is allowed to run without interruption during conditional mobility, then the RLF detection mechanism remains simple and reliable, but service interruptions occur and RRC connection recovery is delayed
Solution Approach 1:
The timer mechanism transitions from a static, always-running state to a dynamic state where it can be selectively stopped and restarted based on mobility conditions. The timer is stopped when mobility execution conditions are met and restarted after mobility completion, allowing the system to adapt between reliability-focused operation and service continuity-focused operation.
Solution Approach 2:
The system performs preliminary assessment of mobility execution conditions before allowing the timer to run. By evaluating whether mobility conditions are met in advance, the system can prevent unnecessary RLF declarations and avoid service interruptions before they occur.
2Loss of time
If the timer is stopped frequently during conditional mobility operations, then service interruptions are avoided, but the complexity of timer management increases
Solution Approach 1:
The system implements feedback mechanisms where the wireless device continuously monitors mobility execution conditions and provides feedback to the timer management logic. This feedback loop automatically triggers timer stop/start actions based on objective conditions, reducing the need for complex manual timer management while maintaining service continuity.
Solution Approach 2:
The wireless device autonomously manages the timer based on its own mobility state and executed conditions. The device self-determines when to stop and restart the timer without requiring external network control, simplifying the overall system architecture while effectively preventing service interruptions.
3Reliability
If the timer runs continuously to ensure accurate RLF detection, then RLF can be declared promptly, but conditional mobility execution is interrupted
Solution Approach 1:
The system applies preliminary anti-action by stopping the timer before RLF detection can be triggered during mobility operations. This prevents the harmful effect of premature RLF declaration that would interrupt conditional mobility execution, while still maintaining the ability to detect genuine RLF conditions after mobility completion.
Data Source
AI summary
The present disclosure relates to handling a timer related to a radio link failure (RLF) in wireless communications. According to an embodiment of the present disclosure, a method performed by a wireless device in a wireless communication system comprises: receiving a conditional mobility command comprising a mobility execution condition for a target cell; detecting that an entering condition of the mobility execution condition is satisfied while a timer is running, wherein a radio link failure (RLF) is detected upon an expiry of the timer; stopping the timer based on detecting that the entering condition of the mobility execution condition is satisfied; and performing a mobility to the target cell based on that the entering condition is satisfied for at least a time to trigger (TTT) related to the mobility execution condition.