Mobile communication system and a user terminal

The mobile communication system includes a user terminal supporting D2D communication is a communication directly between terminals. The time frequency resources available in a mobile communication system, a synchronous signal resources to the a D2D synchronization signal for communication D2D synchronization signal is arranged, a signal for neighboring terminals found according to the D2D communication D2D including a discovery signal resources to the discovery signal is assigned, the. The user terminal receiving the D2D synchronization signal based on the position of the synchronization signal resource D2D synchronization signal the received is arranged to identify the location of the discovery signal resource.