16.9.7 Power Savings Resource Allocation

The SL UE in Mode 2 can support partial sensing-based resource allocation and random resource selection as power saving resource allocation methods. A SL mode 2 TX resource pool can be (pre)configured to allow full sensing only, partial sensing only, random selection only, or any combination(s) thereof. A UE decides which resource allocation scheme(s) can be used in the AS based on its capability (for a UE in RRC_IDLE/RRC_INACTIVE/OOC) and the allowed resource schemes in the resource pool configuration.

Random resource selection is applicable to both periodic and aperiodic traffic.

A UE capable for partial sensing can perform periodic-based partial sensing and/or contiguous partial sensing for resource (re)selection. Periodic-based partial sensing can only be performed if periodic resource reservation is configured in the resource pool. In periodic-based partial sensing, the UE monitors slots in periodic sensing occasion(s) for a given resource reservation periodicity. Contiguous partial sensing is performed by a UE capable of partial sensing when resource (re)selection is triggered by a UE in a TX pool configured with partial sensing. In contiguous partial sensing, the UE monitors slots in a contiguous sensing window which occur prior to the selected transmission resource.