In 908, the BS may perform cellular communication on the unlicensed frequency channel. The BS may select a time at which to perform the cellular communication on the unlicensed frequency channel based at least in part on the carrier sensing performed during the duration of the reservation signal, at least according to some embodiments. For example, if the BS determines that there is no interfering transmission on the unlicensed frequency channel based on the carrier sensing, the BS may select the next time permissible according to the cellular timing synchronization scheme (e.g., cellular slot boundary, cellular half-slot boundary, cellular quarter-slot boundary, etc.) at which to perform the cellular communication on the unlicensed frequency channel. If the BS determines that there is an interfering transmission on the unlicensed frequency channel based on the carrier sensing (e.g., if energy above an energy threshold is detected), the BS may delay performing the cellular communication and extend the duration of the reservation signal. In this case, the BS may perform further carrier sensing at least until energy below the energy threshold is detected on the unlicensed frequency channel, and may select the next time permissible according to the cellular timing synchronization scheme after there is no interfering transmission on the unlicensed frequency channel at which to perform the cellular communication, and may extend the reservation signal until this selected time. Thus, at least according to some embodiments, the duration of the reservation signal may extend from determining that the LBT procedure on the unlicensed frequency channel is successful until performing the cellular communication on the unlicensed frequency channel.