Base station apparatus for controlling downlink transmission power of a small-cell base station

Abstract

A base station apparatus of small-cell base station is provided, by which interference from a small-cell in downlink signals of macro cell can be suppressed without lowering a power of downlink signals from the small-cell base station more than necessary, in state that a macro-cell base station is located neighboring the small cell of small-cell base station. The base station apparatus comprises transmission-power control means of controlling a down link transmission power of downlink in a range between a maximum power and a minimum power which are set in advance, and information acquisition means of acquiring information on electrical field intensity of a transmission signal transmitted from the macro-cell base station located at a periphery of the own base station. The transmission-power control means changes the downlink transmission power so as to change the downlink transmission power to the minimum power or stop the transmission of the downlink transmission signal, when the electric field intensity of transmission signal from the macro-cell base station exceeds a preset electric-field upper threshold, or the electric field intensity is equal to or larger than the electric-field upper threshold, in a state that the downlink transmission power is set to the maximum power.