There is disclosed a method of operating a wireless device in a wireless communication network, the method including performing a clear channel assessment (CCA) procedure in an idle interval of a first fixed frame period preceding a second fixed frame period, wherein the start of a first configured transmission occasion coincides with the start of the channel occupancy interval of the second fixed frame period. The method further includes transmitting communication signaling based on the result of the CCA procedure. The disclosure also pertains to related devices and methods.