On the impact of user mobility on call admission control in WCDMA systems

We present a study of admission control in 3G systems. In particular, we analyze the behavior of algorithms already presented in the literature, with respect to their implementation in UMTS-like systems, and a model of trade-off between the QoS metrics, blocking and dropping probability, is presented. The obtained performance is discussed and analyzed from different points of view, and important related aspects are highlighted. Known algorithms are evaluated, in terms of fairness and generality of the performance, when realistic models for mobility, data rate and discontinuous transmission (DTX) are taken into account. Finally, better models and possible ways to optimize these aspects are proposed.