This article presents the basic theory of power control and deals with the mutual interference among mobile subscribers (basic stations) in uplink (downlink). Considering the SIR requirements, each transmitter in the WCDMA network have to use minimum output power, which is necessary to span channel fading. Accurate transmitter power level can be achieved by using optional power control loops, which send appropriate Transmitter Power Control (TPC) commands through dedicated feedback channel. Effect of power control commands delay in the WCDMA mobile radio network are presented by uplink simulations results. Presented power control loop is based on the standardized algorithm. The investigation of the influence of TPC commands delay in the case of high speed mobile subscriber helps in designing the optional link adaptation algorithm.
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