A method and apparatus for cooperative relaying based on beamforming in a mobile communication system. In a method of cooperative relaying based on beamforming in a mobile communication system, a signal received from a transmitting terminal is decoded by a relay station to determine whether a decoding error occurs. The relay station then acquires a beamforming weight corresponding to decoding error information, if the decoding error occurs. The relay station then applies the beamforming weight to the signal received from the transmitting terminal, and transmits the signal.
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