the present invention in cooperation relay method and apparatus based on the beam forming in a mobile communication system. about as the mobile signal relay method is based on forming beam by the relay device in a communication system comprising the steps of: checking whether the decoding error by decoding a received from the transmitter signal, if the decoding error has occurred, corresponding to the decoding error information and obtaining the beamforming weights, wherein the steps of applying the beam-forming weights to the signals received from a transmitter, including a process for the beamforming weights to send the applied signal, to improve the decoding performance of the terminal, and , to reduce unnecessary retransmissions between the base station and the repeaters, and a signal reception power from the base station can provide a high transfer efficiency to the terminals present in the weak cell edge ;
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