A method may be provided for a device to device (D2D) transmitter to distinguish between different D2D synchronization signals, D2DSSs. The method may include transmitting a device to device synchronization signal (D2DSS) for a first service to a D2D receiver; and associating a first set of D2DSS physical layer parameters to the D2DSS for the first service. A second set of D2DSS physical layer parameters are associated to a D2DSS for a second service so that the D2DSS for the first service is distinguishable from the D2DSS for the second service.