Admission control for mixed services in downlink WCDMA in different propagation environments

Abstract

An admission control algorithm for downlink WCDMA systems is proposed and analysed, through dynamic simulations, considering a detailed propagation model. The evaluated admission control algorithm allows access to radio resources based on a filtered version of transmitted power at a base station. It takes advantage of the suggested prediction mechanism of the future transmitted power and is capable of handling access requests of different service classes. Comparisons with both a reference scenario and basic admission control are included as well. Results indicate that the proposed algorithm can exploit the resource allocation flexibility of power limited systems especially well where propagation conditions introduce heavy spatial non-uniformity. In fact in the simulated urban scenario, the capacity gain, introduced by the proposed algorithm, is shown to be more than doubled compared to the uniform environment case. In addition, it is shown that the algorithm, working with different kinds of services, can maintain almost the same traffic mix, regardless of the absolute system load.