| 摘要 |
A mobile communication system comprises: a base station, a first user terminal that establishes a connection with the base station, and a second user terminal that performs communication with the first user terminal via the base station, the mobile communication system supporting D2D communication that is direct device to device communication, wherein when it is determined that the D2D communication by the first user terminal and the second user terminal is possible, the base station transmits, to the first user terminal, an instruction for having a signal for discovery transmitted, the signal for discovery being used in discovery of a communication partner terminal in the D2D communication. |
