| 摘要 |
Provided is a mobile communication system that has a base station that manages a cell, a user terminal capable of connecting to the cell, and another user terminal that can communicate with the first user terminal via the base station, and the mobile communication system supports D2D communication, which is direct communication between terminals. During a period when the first user terminal is communicating with the other user terminal that is connected to an adjacent cell adjacent to the first cell, if the first user terminal and the other user terminal are determined to be proximate, the first user terminal begins to transmit a discovery signal for the D2D communication. |
