Patent ID: 7197327

Claim:
A method of transmission power control for a wireless transmit receive unit (WTRU) that transmits data signals in a forward channel where the WTRU is configured to make forward channel power adjustments as a function of target metrics computed based on the data signals as received over the forward channel, the method comprising: receiving data signals from the WTRU; computing target metrics for the WTRU's forward channel power adjustments based on the detection of a number of error conditions in the signals received on the forward channel including: setting an initial target metric value based on a predetermined quality of signal requirement; and after a preliminary period at the initial value, changing the target metric by a step up or a step down amount at time intervals of a predetermined length, such that the step up amount has a defined correspondence with the step down amount for each level and the step down amount has a scaling factor inversely proportional to the number of error conditions detected, whereby the target metric is increased by the step up amount if a predetermined error condition has been detected in an immediately preceding time interval or is decreased by the step down amount if the predetermined error condition has not been detected in the immediately preceding time interval; and setting the step down amount at an initial transient state level, such that the initial step down amount is set at a level at least as great as a predetermined step down amount for a steady state level and, reducing the step down amount by a selected amount to a lower level if a predetermined error condition has been detected in an immediately preceding time interval until the step down amount is reduced to the predetermined step down amount for the steady state level.