Wireless communication system, integrated base station, and terminal

An integrated base station connected to a plurality of base stations which carry out a wireless communication with a plurality of terminals, the integrated base station comprising:

• a receiving unit which receives communication-method specification request information for specifying a communication method requested by the terminal, from each of the plurality of the terminals;
• a determining unit which calculates a communication speed between the terminal and each of the plurality of base stations, and determining a communication method corresponding to the communication speed, based on communication-method specification request information;
• a dividing unit which divides a frame into:
• a first time period for integrated base station time division multiplex communication divided into a time of communication between a base station of the plurality of base stations and a terminal of the plurality of terminals and a time of communication between the integrated base station of the plurality of base stations and a terminal of the plurality of terminals, so as to avoid interference between the plurality of base stations,
• a second time period for interference avoiding integrated base station simultaneous communication which is in a spatially-divided state wherein communication between a base station of the plurality of base stations and one terminal and an integrated base station of the plurality of base stations and a second terminal is simultaneously performed so that mutual interference between the plurality of base stations is negligibly small even when the plurality of base stations transmit signals at the same time, and
• a third time period for integrated bases station coordinated communication in which a base station and an integrated base station of the plurality of base stations simultaneously communicate with a terminal, wherein at least one of the base station and the integrated base station uses a signal processed by a signal processing unit of the integrated base station to communicate with the terminal,
• a notifying unit which notifies each of the terminals via the base station of the determined communication method;
• and
• a communication unit that communicates with the terminal via the base stations in the time period to which the determined communication method is allocated.

A terminal which carries out a wireless communication with one or more base stations among a plurality of base stations connected to an integrated base station, the terminal comprising:

• an acquiring unit which receives a reference signal from the one or more base stations and acquires channel information;
• and
• a notifying unit which judges whether a predetermined condition is satisfied or not based on the channel information, and, if satisfied as a result of the judgment, the notifying unit notifies the base station of communication-method specification request information which contains specification of a communication method requested by the terminal,
• wherein the terminal is in a system which comprising:
• dividing means for dividing a frame time into:
• a first time period for time division multiplex communication divided into a time of communication between a base station of the plurality of base stations and a terminal of the plurality of terminals and a time of communication between another base station of the plurality of base stations and a terminal of the plurality of terminals, so as to avoid interference between the plurality of base stations,
• a second time period for interference avoiding simultaneous communication which is in a spatially-divided state, wherein communication between a base station of the plurality of base stations and one terminal and another base station of the plurality of base stations and a second terminal is simultaneously performed so that mutual interference between the plurality of base stations is negligibly small even when the plurality of base stations transmit signals at the same time;
• and
• a third time period for coordinated communication in which a base station and another base station of the plurality of base stations simultaneously communicate with a terminal, wherein at least one of the base station and the another base station uses a signal processed by a signal processing unit of an integrated base station to communicate with the terminal,
• collecting means for collecting channel information between at least one of an antenna of a terminal and the antenna of a base station and an antenna of a terminal and an antenna of the integrated base station,
• determining means for judging whether an estimated communication speed in each communication method calculated from the collected channel information satisfies a requested speed of the terminal or not and determining a communication method for the integrated base station, and
• communication means for, at the integrated base station, carrying out communication with the terminal via the base station in the time period to which the determined communication method is allocated.