Abstract: There is provided an invention whose object is to efficiently perform exchange of control information, for example, in the case where a plurality of cells cooperate to moderate inter-cell interference, like the IA technology. There is provided a communication system in which there is a plurality of communication areas in which a base station apparatus and at least one terminal apparatus perform wireless communication, and the plurality of communication areas are adjacent to or overlap one another, wherein, in each communication area, in a case of performing cooperative control that performs communication while taking into consideration communication conditions in at least one another communication area, a base station apparatus in one communication area among the plurality of communication areas notifies a base station apparatus in another communication area of information for starting the cooperative control.

Abstract: In a communication system in which a plurality base station apparatuses are arranged such that the entirety or part of cells of the plurality of base station apparatuses overlaps with one another, a master base station apparatus calculates transmission weighting coefficients of the base station apparatuses and reception weighting coefficients of mobile station apparatuses such that directions of equivalent channels of interference signals received by the mobile station apparatuses connected to the base station apparatuses become orthogonal to the reception weighting coefficients by which the mobile station apparatuses multiply their respective reception signals. The base station apparatuses transmit the reception weighting coefficients to the mobile station apparatuses connected thereto, and the mobile station apparatuses perform a reception process by multiplying their respective reception signals including the interference signals by the reception weighting coefficients.

Abstract: There is provided an invention whose object is to efficiently perform exchange of control information, for example, in the case where a plurality of cells cooperate to moderate inter-cell interference, like the IA technology. There is provided a communication system in which there is a plurality of communication areas in which a base station apparatus and at least one terminal apparatus perform wireless communication, and the plurality of communication areas are adjacent to or overlap one another, wherein, in each communication area, in a case of performing cooperative control that performs communication while taking into consideration communication conditions in at least one another communication area, a base station apparatus in one communication area among the plurality of communication areas notifies a base station apparatus in another communication area of information for starting the cooperative control.

Abstract: A communication system, a communication method, a base station apparatus, and a mobile station apparatus capable of improving spectral efficiency even when inter-cell interference is caused between cells of a plurality of base station apparatuses are provided. In a communication system 1 in which a plurality base station apparatuses 100-j are arranged such that the entirety or part of cells of the plurality of base station apparatuses 100-j overlaps with one another, a master base station apparatus 100-1 calculates transmission weighting coefficients Vj of the base station apparatuses 100-j and reception weighting coefficients Uk of mobile station apparatuses 200-k such that directions of equivalent channels of interference signals received by the mobile station apparatuses 200-k connected to the base station apparatuses 100-j become orthogonal to the reception weighting coefficients by which the mobile station apparatuses 200-k multiply their respective reception signals.