An Efficient Multiclass Call Admission Control and Adaptive Scheduling for WCDMA Wireless Network

Efficient Call Admission Control (CAC) is necessary for the QoS provisioning in WCDMA environment. Traffic in the upcoming wireless networks is expected to be extremely non stationary. For the traffic of real-time classes which are non stationary at the base station, the performance of scheduler gets degraded due to the presence of arrival rate estimation errors. Inefficient resource (i.e., rate) distributions and unequal delay variations from the targets are caused because of the estimation errors. In this paper, we propose to design a new CAC algorithm with power control for multiple services like voice, video and data for multiclass users. It determines the optimum set of admissible users with the optimum transmitting power level, so as to minimize the interference level and call rejection rate. In addition to this, an adaptive scheduling scheme to allocate optimum rate for each traffic queue is proposed to minimize the scheduling delay. By simulation experiments, we show that the proposed algorithm achieves reduced call blocking probability, optimum rate with reduced delay.