Patent ID: 9661669
Date: 2017-05-23
CPC Classifications: H04L,H04W

Claim:
1. A mobile communication system, comprising: a base station, a first user terminal configured to establish a connection with the base station, and a second user terminal configured to perform communication with the first user terminal via the base station, a neighboring base station adjacent to the base station, and a determination unit configured to determine whether device to device (D2D) communication by the first user terminal and the second user terminal is possible, and the mobile communication system supporting the 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 only 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, when it is estimated that the first user terminal and the second user terminal are close to each other on the basis of location information of each of the first user terminal and the second user terminal, the determination unit determines that the D2D communication by the first user terminal and the second user terminal is possible, and when the second user terminal establishes a connection with the neighboring base station, the base station acquires the location information of the second user terminal from the neighboring base station.