User Equipment Fast Handover Failure Recovery Timer Control
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Solution Overview
Problem
Current 5G NR systems face challenges in achieving seamless handover with zero millisecond interruption time during cell handover procedures, particularly in fast handover failure recovery, where radio link failures can cause service interruptions.
Innovation Solution
Implementing a control method for user equipment that manages a fast handover failure recovery timer (T312) by receiving RRC reconfiguration messages, stopping or reconfiguring the timer based on radio link monitoring configuration information, and initiating RRC connection re-establishment procedures to minimize service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fast handover failure recovery timer (T312) is used to detect radio link failure quickly, then the handover failure recovery speed is improved, but the service interruption time may increase if the timer is not properly managed during RRC reconfiguration
Solution Approach 1:
The patent applies preliminary action by stopping the T312 timer before RRC reconfiguration occurs. This prevents the timer from expiring during the reconfiguration process, thereby avoiding unnecessary service interruptions while still maintaining fast handover failure recovery capability. The timer is stopped in advance (before the reconfiguration) and will be restarted after, ensuring reliable detection without premature expiration.
2Reliability
If the T312 timer is kept running during RRC reconfiguration to maintain fast failure detection, then reliability is improved, but false failure detection may occur causing unnecessary service interruptions
Solution Approach 1:
The patent applies preliminary anti-action by stopping the T312 timer before RRC reconfiguration begins. This preemptive measure counteracts the potential harmful effect of false failure detection during reconfiguration. By stopping the timer in advance, the system prevents the timer from comparing measurements against thresholds during a period when channel conditions are changing due to reconfiguration, thereby eliminating false positives.
3Adaptability or versatility
If RRC reconfiguration is performed during fast handover failure recovery, then network optimization is improved, but the handover failure recovery process may be interrupted causing service disruption
Solution Approach 1:
The patent applies preliminary action by stopping the T312 timer before RRC reconfiguration is executed. This ensures that the failure detection mechanism is temporarily suspended during the reconfiguration process, preventing any potential interruption of the recovery procedure. The timer is restored after reconfiguration completes, allowing network optimization to proceed without compromising handover failure recovery continuity.
Data Source
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AI summary
The present disclosure provides a control method for user equipment and user equipment. The control method for user equipment (UE) includes: receiving, by the UE, a radio resource control (RRC) reconfiguration message from a base station; and if the RRC reconfiguration message includes radio link monitoring configuration information, if a fast handover failure recovery timer is running, stopping the fast handover failure recovery timer.