Call Admission Control for QoS and Performance Analysis of Handoff Calls

In this paper, we propose a call admission control (CAC) algorithm with a handoff queue in mobile hotspots, where different admission control policies are employed, depending on the vehicle mobility. We have proposed a scheme that keeps the dropping probability below a specified level while achieving high channel utilization. Call admission control is a very important measure in CDMA system to guarantee the quality of the communicating links. In future wireless networks multimedia traffic will have different QoS requirements. In this paper, the uplink capacity and load estimation formulas is formulated. Then, a prioritized throughput based uplink call admission control algorithm for a WCDMA cellular system with perfect power control is presented. To give priority to soft handoff calls, we introduce queuing techniques and the idea of ‘soft guard channels’, which is represented by reserving a small fraction of the cell load for the higher priority calls. The performance of this admission control with different scenarios is studied. Based on simulation results, we conclude that this algorithm reduces the dropped soft handoff calls and improves the overall system capacity.