Inter-base-station cooperated mimo transmitting method and base station apparatus

An inter-base station cooperated MIMO transmitting method for a plurality of base station apparatuses to cooperate with each other to perform MIMO transmission to a plurality of mobile station apparatuses, the method comprising:

• a step of acquiring channel state information at the plurality of base station apparatuses from the plurality of mobile station apparatuses;
• a step of deciding, according to the presence/absence of the channel state information, a cooperation target mobile station apparatus to which the plurality of base station apparatuses cooperate with each other to transmit a signal and a non-cooperation target mobile station apparatus to which a specific base station apparatus transmits a signal;
• and
• a step of generating precoding weights for the signals transmitted to the cooperation target and non-cooperation target mobile station apparatuses based on the channel state information.