Wake-up signal with frequency information

The application relates to a method for operating a first wireless device (100) in a wireless network. At least one target wireless device (200) is determined which should receive a wake up signal by which a wake up receiver of the at least one target wireless device is informed that a main transceiver of the target wireless device should be ready for receiving at least a first message from the first wireless device, Furthermore a frequency is determined at which the at least first message should be transmitted to the at least one target wireless device, and a frequency information is encoded into the wake up signal with which at least one target wireless device is informed about the frequency at which the at least first message will be received. The wake up signal is transmitted with the encoded frequency information to the at least one target wireless device.