It is an object of the invention to provide a wireless communication system capable of decoding a downlink shared channel of an interfering cell while achieving the reduction of intercell interference to a downlink control channel of an interfered cell. In a wireless communication system that controls transmission timing of each base station so that a control channel transmitted by a first base station and a shared channel transmitted by a second base station temporally overlap, the second base station includes a muting control unit and a muting processing unit that transmit a null symbol in an overlapping time interval of the shared channel with a time interval of the control channel on the basis of the number of code blocks in a data signal component for each mobile station corresponding to the overlapping time interval of the shared channel with the time interval of the control channel.