Wireless communications systems and methods related to resource reservation for sidelink communication over a shared radio frequency band are provided. The method of wireless communication performed by a user equipment (UE) includes performing, in a shared radio frequency band, a listen-before-talk (LBT) for a first channel occupancy time (COT) and transmitting, during the first COT, a COT structure indicator, wherein the COT structure indicator reserves at least one resource within a second COT different than the first COT.