Sidelink Carrier Aggregation RLF Timer Control Between UEs
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing inter-user equipment (UE) coordination in sidelink carrier aggregation (SL CA), particularly in detecting and handling radio link failures (RLF) across multiple carriers, which can disrupt communication quality and efficiency.
Innovation Solution
A UE is configured to receive configuration information about multiple SL carriers, determine SL RLF, and initiate a timer-based activation or deactivation of carriers, with a base station (BS) transmitting configuration information and managing timer-based carrier status changes to optimize SL CA operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SL carriers are configured for SL CA operation, then communication capacity and reliability are improved, but the complexity of managing carrier activation/deactivation and detecting RLF increases
Solution Approach 1:
The UE autonomously detects SL RLF on each SL carrier and independently activates or deactivates carriers based on timer status without requiring network intervention. The UE self-manages the carrier aggregation configuration by monitoring RLF conditions and adjusting active carriers accordingly, reducing signaling overhead and network-side complexity.
2Productivity
If a timer-based mechanism is used for carrier activation/deactivation, then carrier management becomes automated and efficient, but the response time to RLF detection and carrier deactivation is extended
Solution Approach 1:
The timer duration is dynamically adjusted based on the specific RLF condition and carrier importance. The system allows flexible timer configuration where critical carriers may use shorter timers for faster response, while less critical carriers use longer timers to prevent premature deactivation. This dynamic timing strategy balances automation efficiency with responsive fault management.
3Reliability
If SL RLF detection is performed continuously on all SL carriers, then communication reliability is maintained, but the energy consumption and processing load increase
Solution Approach 1:
Instead of continuously monitoring all SL carriers, the system performs RLF detection only on active carriers and only when necessary based on traffic conditions. The UE applies partial monitoring strategies where resources are allocated for RLF detection proportionally to the number of active carriers and current communication load, reducing unnecessary energy consumption while maintaining adequate reliability monitoring.
Data Source
AI summary
Methods and apparatuses for inter-user equipment (UE) coordination in sidelink (SL) carrier aggregation (CA) in a wireless communication system. A method of operating a UE includes: receiving, from a base station (BS), configuration information about multiple SL carriers for a SL CA operation; determining whether a SL radio link failure (RLF) is detected for a SL carrier among the multiple SL carriers; and starting a timer for the SL carrier based on a determination that the SL RLF is detected, wherein an activation or a deactivation of the SL carrier is determined based on a status of the timer.