Method and system for relaying signal in a mobile communication system

A method and a system for relaying signals in a communication system are provided to increase system capacity and extend a service area by proposing a concrete signal relay operation process among a base station, a relay station and a mobile station, and minimize control message transceiving operations for uplink signal relay by enabling the relay station to determine whether to relay the uplink signals of the mobile station. In a signal relay method of a relay station(102) in a communication, the method comprises the following steps of: measuring signal quality of a mobile station(104); and enabling the relay station itself to determine whether to relay signals, transmitted from the mobile station, to a base station(100) in consideration of the signal quality(116). If so, the method further comprises a step of requesting the base station to allow relay of the mobile station signals(118).