MOBILE COMMUNICATION SYSTEM AND USER TERMINALS

摘要

A mobile communication system includes a user terminal that supports D2D communication that is direct device-to-device communication. A time-frequency resource available in the mobile communication system includes: a synchronization signal resource in which a D2D synchronization signal that is a synchronization signal for the D2D communication should be located; and a discovery signal resource in which a D2D discovery signal that is a signal for discovering a proximal terminal for the D2D communication should be located. The user terminal receiving the D2D synchronization signal identifies a location of the discovery signal resource on the basis of a location of the synchronization signal resource in which the received D2D synchronization signal is located.