SCG RLF Detection Using Dual Timers in Wireless UE
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in detecting early radio link failure (RLF) and efficiently recovering from it, particularly in secondary cell groups (SCG) of dual connectivity configurations, leading to increased service interruption times.
Innovation Solution
Implementing a second timer (T312) for early RLF detection in secondary cells, allowing the UE to declare SCG RLF upon expiry of either the first timer (T310) or the second timer (T312), and initiating a SCG failure procedure to minimize service interruption by expediting recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single timer (T310) is used for RLF detection in SCG, then the detection process is simple, but the service interruption time is increased due to delayed failure detection
Solution Approach 1:
The patent divides the single RLF detection timer into two separate timers: T310 for traditional RLF detection and T312 for early RLF detection. This segmentation allows the system to detect failures at two different stages - early stage via T312 expiry and confirmed stage via T310 expiry - thereby reducing service interruption time while maintaining detection reliability
Solution Approach 2:
The patent implements preliminary action by starting timer T312 when a measurement report is triggered during T310 operation. This early timer provides advance warning of potential RLF conditions before the main T310 timer expires, enabling the network to prepare handover or recovery actions in advance, thus reducing overall service interruption time
2Loss of time
If early RLF detection is implemented with multiple timers, then the service interruption time is reduced, but the device complexity is increased
Solution Approach 1:
The patent applies universality by making both timers T310 and T312 serve the common function of RLF detection. The UE declares SCG RLF upon expiry of either timer, and both timers can be stopped under similar conditions (successful handover, recovery). This multi-functional approach simplifies the overall logic despite having multiple timers, as they work together rather than independently
Solution Approach 2:
The system implements self-service through automatic timer management where the UE autonomously starts, stops, and declares failure based on timer expiry. The network configures the timers but the UE independently manages their operation, reducing the need for complex network-controlled timer coordination and simplifying the overall system architecture
Data Source
AI summary
Embodiments herein disclose a method for handling an RLF in a wireless communication system by a UE (100). The method includes receiving a measurement configuration including a second timer (150) from a SN (300). Further, the method includes configuring the UE with the second timer associated with a measurement report for a PSCell of the SN. Further, the method includes starting the second timer when the measurement report is triggered while a first timer (140) for the PSCell is running. Further, the method includes detecting an expiry of one of: the first timer and the second timer for the PSCell. Further, the method includes declaring an SCG RLF upon expiry of one of: the first timer and the second timer whichever expires sooner. Further, the method includes initiating an SCG failure procedure towards an MN (300) upon declaring SCG RLF.