Interference suppression apparatus, system, inter-base station control method and program

Abstract

In a HetNet configuration in which plural small-sized second cells are disposed in a first cell, an amount of signal processing for suppressing interference from other cells with respect to a reception signal on an uplink line of a base station of any one of the cells is reduced. An interference suppression apparatus creates a first propagation-path response matrix including a plurality of first propagation-path responses from terminals of plural second cells to a first base station, creates a second propagation-path response matrix including a plurality of second propagation-path responses from terminals of plural second cells to plural second base stations, calculates plural reception weights based on the first propagation-path response matrix and an inverse matrix of the second propagation-path response matrix, and suppresses interference to an uplink of the first base station, based on a reception signal of the first base station, reception signals of the plural second base stations and the plural reception weights. The interference suppression apparatus sets to zero a second propagation-path response having an electric power of magnitude equal to or less than a predetermined threshold value or less than the threshold value among the plurality of the second propagation-path responses included in the second propagation-path response matrix before calculating the inverse matrix.