Constrained power control scheme to increase capacity of multi-service systems

We propose and study a power control scheme for direct sequence code division multiple access (DS-CDMA) systems supporting voice and data services. In the proposed scheme, the voice users are subjected to the conventional power control, while the data users are imposed a transmitter power range constraint, to reduce interference imposed on both its own and neighboring base stations. For given delay and outage probability requirements, the proposed scheme can support more number of users in such systems when compared to the conventional power control scheme, where no such constraint is imposed. In addition, simulation results show that the sum of received powers at the base station for such system, where non delay-sensitive users are subjected to power range constraint, can also be characterized by the lognormal distributions.