Dynamic Uplink Power Control for Cellular Radio Systems over Fast Fading Channel

In cellular wireless CDMA systems, it is required that the base station receives constant power signals from mobile users, in order to guarantee link quality. This is achieved by properly adjusting the uplink transmitted power of each mobile. Usually, the base station is responsible for informing each individual mobile of the power adjustment. However, when the radio channel varies drastically under fast fading, the power control signaling from the base station may not be appropriate for the current uplink. In the proposed power control scheme, the mobile transmits at variable power levels based on the uplink channel prediction. The prediction accuracy is improved by exploiting the relationship between the access channel and the traffic channel. Simulation results show that this scheme combats the fast fading channel effect, hence increasing the system performance.