A wireless communication method for suppressing interference between a first communication cell and an adjacent second communication cell using the same time and frequency channel, each communication cell including a base station (110, 120) and a terminal station (111, 121), the method comprising: transmitting, from the base station of the second communication cell, a transmission request signal to request transmission to the terminal station of the second communication cell; waiting, by the base station of the first communication cell, for a response signal transmitted from the terminal station of the second communication cell to be received when receiving the transmission request signal; transmitting, by the terminal station of the second communication cell, to the base station of the second communication cell, a response signal when receiving the transmission request signal; receiving, by the base station of the first communication cell, the response signal transmitted from the terminal station of the second communication cell; estimating, by the base station of the first communication cell, a channel from the response signal transmitted from the terminal station of the second communication cell, and storing a propagation channel estimation result; and using the propagation channel estimation result for calculating a transmission weight for controlling directivity of a radio wave produced from a plurality of antennas of the base station of the first communication cell to suppress interference with the terminal station of the second communication cell; characterized in that the method further comprises: calculating an interference power between the base station of the first communication cell and the terminal station of the second communication cell when the transmission weight is used; and performing, by the base station of the first communication cell, data transmission to the terminal station of the first communication cell based on a transmission power determined to be increased as the interference power increases at least in a range from -20 dB to 30 dB, when the interference power is equal to or more than a predetermined threshold. transmitting, from the base station of the second communication cell, a transmission request signal to request transmission to the terminal station of the second communication cell; waiting, by the base station of the first communication cell, for a response signal transmitted from the terminal station of the second communication cell to be received when receiving the transmission request signal; transmitting, by the terminal station of the second communication cell, to the base station of the second communication cell, a response signal when receiving the transmission request signal; receiving, by the base station of the first communication cell, the response signal transmitted from the terminal station of the second communication cell; estimating, by the base station of the first communication cell, a channel from the response signal transmitted from the terminal station of the second communication cell, and storing a propagation channel estimation result; and using the propagation channel estimation result for calculating a transmission weight for controlling directivity of a radio wave produced from a plurality of antennas of the base station of the first communication cell to suppress interference with the terminal station of the second communication cell; characterized in that the method further comprises: calculating an interference power between the base station of the first communication cell and the terminal station of the second communication cell when the transmission weight is used; and performing, by the base station of the first communication cell, data transmission to the terminal station of the first communication cell based on a transmission power determined to be increased as the interference power increases at least in a range from -20 dB to 30 dB, when the interference power is equal to or more than a predetermined threshold. calculating an interference power between the base station of the first communication cell and the terminal station of the second communication cell when the transmission weight is used; and performing, by the base station of the first communication cell, data transmission to the terminal station of the first communication cell based on a transmission power determined to be increased as the interference power increases at least in a range from -20 dB to 30 dB, when the interference power is equal to or more than a predetermined threshold.