Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a trigger signal indicating that a base station has obtained access to a shared radio frequency spectrum band. The UE may transmit, in response to the trigger signal, a trigger response signal configured to reserve a channel of the shared radio frequency spectrum band for a downlink transmission by the base station, where the trigger response signal is transmitted for a time period extending to a scheduled beginning of the downlink transmission. The UE may receive the downlink transmission after an expiration of the time period and based at least in part on the trigger signal.