Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a mobile station may receive a resource reservation for one or more resources in a resource pool configured for sidelink communication. The mobile station may transmit an indication of the resource reservation using an entry-based format or a bitmap-based format, wherein the entry-based format or the bitmap-based format is selected based at least in part on a configuration of the resource pool, a periodicity of the resource reservation, or whether the resource reservation is multiplexed with sidelink data. Numerous other aspects are described.