Therefore, the TxUE transmits a discovery signal through only the configured discovery resource in operation 1040. The RxUE receives the discovery signal in operation 1050. Here, FIG. 10 illustrates a process in which discovery type 2 is executed.

FIG. 11 is a diagram illustrating another process in which D2D data communication is executed in an RRC connected mode, in a wireless communication system according to an exemplary embodiment.

FIG. 11 illustrates a process of executing mode 2 ProSe direct communication before executing mode 2 communication in an RRC connected mode. As an example, the mode 2 operation may be used for an exceptional case such as RLF, and mode 1 operation may be executed as the default. An idle mode UE executes the mode 2 operation based on information indicated by the SIB.

Particularly, the RRC connected mode TxUE and RxUE request ProSe direct communication transmission grant from a BS, in operations 1100 and 1102 The BS determines the ProSe direct communication transmission grant received from each UE, and grants the request based on context of a corresponding UE, in operation 1105 and 1107.

The BS transmits configuration information associated with mode 2 and information associated with a Tx/Rx resource pool for mode 2, through a dedicated signaling, to each of the RRC connected mode TxUE and RxUE, in operations 1110 and 1112. The TxUE and the RxUE are in an RRC connected mode, the BS may transmit, to each UE, an RRC signaling that includes information for the mode 2 D2D data communication in RRC configuration information.