The interference cancellation relay apparatus includes a first transmission / reception processing unit for adjusting a gain of an RF (radio frequency) input signal input through a link antenna communicatively coupled to a base station, a second transmission / reception processing unit for receiving interference from an output signal of the first transmission / Extracts a signal having a predetermined size regardless of a change in user traffic from the output signal of the interference eliminating circuit and the interference eliminating circuit which remove the signal and output the signal, and controls the first transmitting / receiving processor based on the extracted signal, To a predetermined level.
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