16.9.9.5 Resource Allocation

A UE using mode 2 resource allocation may support resource selection enhancements to avoid LBT blocking and increase COT resource utilization. If transmission in slot(s) before a reserved resource is able to share its initiated COT to the reservation, the UE may be (pre)configured to prioritize/select resource(s) in the slot(s) for transmission. To avoid blocking, a UE may avoid selection of a number of consecutive resources (up to UE implementation) before a reserved resource. Furthermore, a UE may avoid selection of a number of consecutive resources (up to UE implementation) after a reserved resource.

A UE using mode 2 resource allocation operating in a resource pool of resources without PSFCH configured can support resource selection for multiple consecutive slot transmission (MCSt). Mode 2 resource allocation operating in a resource pool of resources with PSFCH configured can be used for Multi-TB MCSt with single slot candidate resources. A UE autonomously determines whether to use MCSt, and the number of consecutive slots in an MCSt up to the maximum COT duration for a specific SL-CAPC as defined in TS 37.213 [37]. MCSt can be used for transmission of a single TB or multiple TBs. For each TB transmitted in an MCSt, the UE triggers resource (re)selection only when LBT failure is detected on the resources for the initial transmission and all retransmissions of the TB.