Patent ID: 7912487

Claim:
A base station comprising: a terminal position determining unit configured to determine a relative position of a terminal within a cell radius; a transmitter configured to transmit a first signal to the terminal; and a control unit configured to set, in dependence upon the relative position of the terminal, a transmission power and a modulation scheme for communication with the terminal, to at least two downlink channels for transmitting the first signal to the terminal, wherein the control unit selects, from among the at least two downlink channels, a first downlink channel having a frequency designed for not causing interference with an adjacent base station when the terminal position determining unit determines that the terminal is at a first position relatively distant from the base station within the cell radius, and the control unit selects, from among the at least two downlink channels, at least one of the first downlink channel and a second downlink channel having a frequency different from that of the first downlink channel when the terminal position determining unit determines that the terminal is at a second position closer than the first position to the base station within the cell radius, wherein when the first downlink channel is selected, a first modulation scheme is set to the selected first downlink channel in combination with a first transmission power, and when the second downlink channel is selected, a second modulation scheme having a modulation level lower than the first modulation scheme is set to the selected second downlink channel in combination with a second transmission power lower than the first transmission power, so that a frequency assigned to the selected second downlink channel is reused between adjacent cells without causing interference with each other.