Sidelink Resource Reselection After Consistent LBT Failure

The patent segments the failure processing into distinct operational modes (intra-resource pool reselection and inter-resource pool switching) and distinct recovery procedures (timer-based recovery and event-triggered recovery). This segmentation allows the system to handle LBT failures systematically with dedicated procedures for each scenario, improving reliability while maintaining unlicensed band utilization.

The patent establishes preliminary failure detection mechanisms where the terminal monitors LBT outcomes and maintains failure counters before actual transmission failures occur. By detecting and counting LBT failures in advance and triggering recovery procedures proactively, the system prepares for potential transmission failures, ensuring continuous operation in unlicensed bands.

The patent implements self-service mechanisms where the terminal autonomously detects LBT failures, counts them against configured thresholds, and triggers appropriate recovery procedures without network intervention. The terminal independently performs resource reselection within pools, switches between pools, and manages recovery timers, enabling failure processing capability while maintaining relatively simple system structure.

The patent utilizes parameter changes including failure counters, threshold comparisons, and timer values to manage LBT failure processing. By monitoring failure counts and comparing against configured thresholds, and by managing recovery timers, the system achieves automated failure handling with controlled complexity through configurable parameters rather than complex hardwired logic.