Closed-loop transmitting power control method using variable updating amount

A closed-loop transmitting power control method in which a receiver instructs a transmitter to increase or decrease transmitting power such that an Eb/I0 value of signals received by said receiver from said transmitter converges on a set reference value, said method comprising the steps of:

• performing a measurement at said receiver of frame errors during a fixed time interval of received signals from said transmitter;
• if a frame error is not detected in said measurement, setting a downward updating amount, which is an updating amount for lowering said reference value, in accordance with the magnitude of said reference value, lowering said reference value by said downward updating amount, and further, subtracting “1” from a fluctuation level value, which is a value indicative of the degree of stability of the communication environment, unless said fluctuation level value is “0”;
• and
• if a frame error is detected in said measurement, setting an upward updating amount, which is an updating amount for raising said reference value, in accordance with said fluctuation level value, raising said reference value by the upward updating amount, and further, adding “1” to said fluctuation level value.