| 摘要 |
At a reception time, a propagation attenuation calculator (5) calculates a propagation attenuation amount from a transmitting radio device to the own device based on reception power and transmission radiation-power information included in a reception PLCP frame, and a transmission power controller (6) calculates optimum transmission power at each transmission rate based on a propagation attenuation amount and minimum necessary reception power, and registers the optimum transmission power into an optimum transmission power table by relating the optimum transmission power to a radio device identifier for identifying the transmitting radio device and each transmission rate. At a transmission time, the transmission power controller (6) selects optimum transmission power to the transmission destination radio device based on the optimum transmission power table, a radio identifier of the transmission destination radio device, and a transmission rate, and carries out a transmission power control of transmitting a transmission PLCP frame including the optimum transmission power as transmission radiation-power information, using the selected optimum transmission power, and detects whether there is a value smaller than the selected optimum transmission power in the optimum transmission power at a minimum transmission rate of a radio device different from a transmission destination radio device registered in the optimum transmission power table. |
