A method for wireless communications at a first wireless device, comprising: identifying (515, 1005, 1105) a transmission timing scheme for a shared radio frequency spectrum band, the transmission timing scheme comprising a first set of time intervals allocated for transmissions using a first radio access technology and a second set of time intervals allocated for transmissions using a second radio access technology, the first wireless device operating according to the first radio access technology; receiving, from a second wireless device operating according to the first radio access technology, a first channel reservation signal for a first transmission during a time interval of the first set of time intervals, the first channel reservation signal indicating a first time difference between a transmission time of the first channel reservation signal and a first end time of the time interval; transmitting (525, 1010, 1110), during the time interval of the first set of time intervals, a second channel reservation signal for a second transmission to be transmitted after the first transmission, the second channel reservation signal indicating a second time difference between a transmission time of the second channel reservation signal and the first end time of the time interval and indicating that the first wireless device uses the first radio access technology; and transmitting (540, 1015, 1115), based at least in part on the transmitted second channel reservation signal, the second transmission over the shared radio frequency spectrum band during at least a portion of the time interval before the first end of the time interval. identifying (515, 1005, 1105) a transmission timing scheme for a shared radio frequency spectrum band, the transmission timing scheme comprising a first set of time intervals allocated for transmissions using a first radio access technology and a second set of time intervals allocated for transmissions using a second radio access technology, the first wireless device operating according to the first radio access technology; receiving, from a second wireless device operating according to the first radio access technology, a first channel reservation signal for a first transmission during a time interval of the first set of time intervals, the first channel reservation signal indicating a first time difference between a transmission time of the first channel reservation signal and a first end time of the time interval; transmitting (525, 1010, 1110), during the time interval of the first set of time intervals, a second channel reservation signal for a second transmission to be transmitted after the first transmission, the second channel reservation signal indicating a second time difference between a transmission time of the second channel reservation signal and the first end time of the time interval and indicating that the first wireless device uses the first radio access technology; and transmitting (540, 1015, 1115), based at least in part on the transmitted second channel reservation signal, the second transmission over the shared radio frequency spectrum band during at least a portion of the time interval before the first end of the time interval.