Base station and wireless communication system

A base station included in a wireless communication system, wherein:

• the base station transmits data to a plurality of communication terminals through cooperation among a plurality of other base stations,
• each of the plurality of communication terminals is configured to:
• communicate with the base station;
• and
• periodically transmit, to the base station, information necessary for data transmission from a single base station out of the plurality of other base stations,
• the base station is configured to:
• determine whether only a selected communication terminal among the plurality of communication terminals can secure a communication quality which should be satisfied by using the data transmission from the single base station in a case of determining whether the only selected communication terminal needs the data transmission through the cooperation among the plurality of other base stations;
• transmit a transmission instruction of cooperation information to the only selected communication terminal in a case where a determination is made that the only selected communication terminal cannot secure the communication quality;
• receive the cooperation information transmitted from the only selected communication terminal;
• transmit a result of the wireless resource allocation for the data transmission through the cooperation among the plurality of other base stations to cooperating base stations that cooperate with the base station;
• allocate wireless resources for the data transmission from the single base station to the only selected communication terminal, based on the received information necessary for the data transmission from the single base station in a case where a determination is made that the only selected communication terminal can secure the communication quality;
• and
• refer to a result of the wireless resource allocation to the selected communication terminal for the data transmission from the single base station, and determine that cooperative transmission is necessary when the wireless resource allocation for the data transmission from the single base station to the selected communication terminal is determined as a failure, the selected communication terminal not being allocated the wireless resources for the data transmission when the wireless resource allocation for the data transmission from the single base station to the selected communication terminal is determined as the failure;
• and
• the cooperation information is information that is necessary for the data transmission through the cooperation among the plurality of other base stations.