Patent ID: 9674877
Date: 2017-06-06
CPC Classifications: H04W

Claim:
1. A mobile communication system that supports device to device (D2D) communication, comprising: a first user terminal a second user terminal; and a base station, wherein the first user terminal transmits a first D2D discovery signal indicating that the first user terminal requests relay of communication between the first user terminal and the base station, the second user terminal receives the first D2D discovery signal, the second user terminal determines whether a received power of a reference signal from the base station is above a first threshold value and below a second threshold value, in response to the second user terminal determining that the received power is above the first threshold value and below the second threshold value, the second user terminal transmits indication information to the base station, wherein the indication information indicates that the second user terminal is capable of performing the relay of communication between the first user terminal and the base station, and the base station transmits, to the second user terminal, information of a radio resource for the relay.