In a method of digital data transmission in a wireless communication network in which a controlling communication takes place within a fixed bandwidth of a channel from a master station to all subscribers (downlink) with the help of a fixed signal frame, and the beginning of the fixed signal frame is marked by a special frame synchronization signal detectable by the subscribers, an occupancy of at least one subband by transmission signals and a non-occupancy of at least one complementary subband by transmission signals is used as a frame synchronization signal.