Communication system and communication control method

A communication system having a plurality of base stations, a plurality of communication terminals, and a base station managing apparatus, wherein

• a first communication terminal calculates a first desired channel matrix based on a reference signal received from a first base station in communication with the first communication terminal and notifies the first base station of the first desired channel matrix in an uplink message,
• a second communication terminal calculates a second desired channel matrix based on a reference signal received from a second base station in communication with the second communication terminal, also calculates a second interference channel matrix based on a reference signal received from the first base station having the strongest power of an interference wave affecting the second communication terminal, and notifies the second base station of the second desired channel matrix and the second interference channel matrix in an uplink message,
• the second base station notifies the base station managing apparatus of the second interference channel matrix,
• the base station managing apparatus notifies the first base station of the second interference channel matrix, and
• the first base station calculates transmission weight based on the first desired channel matrix and the second interference channel matrix.

A communication control method of a communication system having a plurality of base stations and a plurality of communication terminals, wherein the communication terminal carries out

• a step of receiving a reference signal from a desired base station in communication with the communication terminal,
• a step of calculating a desired channel matrix based on the reference signal received from the desired base station,
• a step of receiving a reference signal from a strong interference base station having the strongest power of an interference wave affecting the communication terminal,
• a step of calculating an interference channel matrix based on the reference signal received from the strong interference base station, and
• a step of notifying the desired base station of the desired channel matrix and the interference channel matrix in an uplink message.