Patent ID: 7050760

Claim:
A transmission power control method where a transmission power of a base station is adjusted according to a power control signal received from a terminal station, said transmission power control method comprising the steps of: generating an average received signal interference ratio given by averaging received signal interference ratios obtained from a received signal over a predetermined time period; generating a signal interference ratio difference value by calculating a difference between said average received signal interference ratio and a target signal interference ratio generated previously; generating a first adjusting amount for said target signal interference ratio according to said signal interference ratio difference value; detecting whether a received signal has an error and generating an error detection result; generating a second adjusting amount according to said error detection result; determining whether said signal interference ratio difference value is within a predetermined range, selecting said second adjusting amount when said signal interference ratio difference value is within the predetermined range, and selecting said first adjusting amount when said signal interference ratio difference value is not within the predetermined range; generating an updated target signal interference ratio by updating said target signal interference ratio generated previously based on said selected one of first adjusting amount and said second adjusting amount; generating said power control signal based on a comparison result between said received signal interference ratio and said updated target signal interference ratio; and transmitting said power control signal to said base station.