Transmission power control method for W-CDMA wireless communication systems

摘要

Disclosed are W-CDMA transmission power control methods in a wireless communication system in which power allocated to a pilot signal can be varied to at least a first power and a second power. The method includes the steps of: if a high-quality service call is made, setting the target quality to be larger than a convergence value so as to satisfy an initial pull-in characteristic, reducing the target quality by a prescribed amount if no error is detected whenever an error detection check is made and, when an error is detected, thenceforth measuring error rate at a target-quality update period that conforms to service quality, comparing the error rate measured and a required error rate, and updating the target quality based upon the result of the comparison; if a low-quality service call is made, setting the target quality to be larger than a value at which a dedicated control channel can be decoded correctly, measuring the error rate at a target-quality update period that conforms to service quality, comparing the error rate measured and a required error rate, and updating the target quality based upon the result of the comparison; and measuring the quality of a receive signal in parallel with control for updating target quality, and sending a transmission power control signal to the transmitting side in such a manner that the measured quality will agree with the target quality.