A New Adaptive Power Control Algorithm for UMTS

The capacity of Wideband Code Division Multiple Access (WCDMA) technologies in Universal Mobile Telecommunication System (UMTS) relies on efficient power control algorithms. The typical UMTS power control algorithm is based on fixed step size. Therefore, it causes oscillations when the radio channel is unchanged. Furthermore, it lacks abilities to cope with rapid variations in fast fading channels. In this paper, we propose a new adaptive power control algorithm for in UMTS. The proposed algorithm can mitigate the oscillations when the channel changes slowly. Moreover, it is capable for tracking rapid changes in fast fading channels, where the typical UMTS power control algorithm fails to handle.