A method of and device for generation and transmission of a first data message over a wireless channel and for a device-to-device enabled cellular communication device arranged to operate with a cellular radio access network. A transmitter identification, ID, of the cellular communication device in the first data message is included The entire first data message, including at least data associated with the transmitter ID is scrambled with a scrambling sequence associated with a synchronization source identity. The first data message is transmitted over the wireless channel. A corresponding method of and device for receiving and decoding one or more data messages over a wireless channel and for a device-to-device enabled cellular communication device arranged to operate with a cellular radio access network. A first synchronization source identity is determined. A received first data message with a scrambling sequence associated with the first synchronization source identity is descrambled. The received first data message is decoded. A transmission identity, ID, is determined from the first data message.