Wireless base station and wireless communication method

A first radio base station in a radio communication system that performs MIMO transmission between a plurality of radio base stations and at least one user terminal, the first radio base station comprising:

• a precoding section that applies precoding to a data signal based on channel information indicating channels between the radio base stations and the user terminal;
• and
• a communication section that transmits the precoded data signal,
• wherein the precoding in the first radio base station of the plurality of radio base stations is applied based on the channel information including at least a channel between the first radio base station and a first user terminal connected to a second radio base station other than the first radio base station, and
• wherein beam-forming by the first radio base station whose amount of used resources is smaller than a threshold among the plurality of radio base stations forms beams for the user terminal connected to the second radio base station.