As shown in FIGS. 13 and 14, a collision may occur between a D2D discovery signal and D2D data (or SA) on a single carrier, or a collision may occur between D2D data (or SA) of a carrier and SA (or D2D data) of another carrier. In the case of D2D discovery and D2D communication, a transmission timing may not be controlled by a single network. For example, for reception of an inter-PLMN discovery signal, a corresponding UE may monitor reception of a discovery signal transmitted on another PLMN (or carriers), during a predetermined period of time. In parallel with the above, D2D signal transmission or reception may occur on a serving PLMN (or carriers).
In this instance, a method of multiplexing D2D signals when a plurality of D2D signals are simultaneously generated, according to an exemplary embodiment, will be described as follows.
