Provided is a method of signal transmission and reception for a user equipment (UE) in a mobile communication system. The method may include: receiving configuration information for discovery signals from a base station (ENB); determining a transmission resource for a discovery signal on the basis of the received configuration information; and sending a discovery signal utilizing a transmit power determined based on the position of the transmission resource and the configuration information. Accordingly, it is possible to reduce interference effects caused by UEs transmitting a signal and improve communication performance in a mobile communication system.