A hierarchical power control scheme in CDMA systems

Power control is one of the key technologies of resource management in CDMA systems to provide guaranteed QoS to multimedia applications. We propose a hierarchical power control scheme for multimedia CDMA systems, where the power control process is divided into two steps, i.e., power adjustment, in a short span, and power scheduling, in a long span. In the power control scheme, we take the dependence between user parameters and user QoS constraints into consideration. Numerical results show that with the proposed power control scheme, user QoS can be guaranteed and better system resource utilization is achieved