Improved resource allocation approaches for sidelink communication are provided. In an aspect, a first wireless device may reserve a first resource for a sidelink communication and second resources for retransmissions, respectively, of the sidelink communication, and may transmit the sidelink communication using the first resource. In response to determining to release the second resources, the first wireless device may transmit, to a second wireless device, a release indication indicating that the second resources are available. In an aspect, a wireless device may receive a first sidelink communication from a transmitting wireless device on a first resource, and may identify second resources reserved respectively for retransmissions of the first sidelink communication. In response to a determination that the second resources are available for a second sidelink communication, the wireless device may report the second resources to a higher layer within the wireless device for resource selection.