16.1.7 URLLC in Unlicensed Controlled Environment

URLLC services can be supported in shared spectrum where LBT failures are assumed to be not frequent. In this case, a channel access procedure for semi-static channel occupancy can be initiated by the gNB or the UE, or the gNB operates in dynamic channel access mode, as described in TS 37.213 [37]. To handle potential LBT failures on configured grants (CG), the CG retransmission timer can be optionally configured to enable autonomous retransmissions, and it may be configured simultaneously with enhanced intra-UE overlapping resource prioritization mechanisms. When the CG retransmission timer is configured, the UE shall select the HARQ process for each CG resource by itself. If the enhanced intra-UE overlapping resource prioritization mechanisms is also configured, the UE may be further configured to select the HARQ process for a CG resource based on logical channel priority.