A method for a device-to-device (D2D) communication in a wireless communication system is discussed. The method performed by a user equipment (UE) includes measuring a D2D received signal strength indicator (RSSI) for each resource region for the D2D communication, the D2D RSSI representing a received signal strength per symbol in the resource region; obtaining ratio information indicating a ratio of D2D resource regions having a higher D2D RSSI than a specific threshold within a resource pool for the D2D communication; and transmitting a measurement report including the ratio information to a base station.