Performance analysis of two throughput-based call admission control schemes for 3G WCDMA wireless networks supporting multiservices

The wide-band code division multiple access (WCDMA) based 3G and beyond cellular mobile wireless networks are expected to provide a diverse range of multimedia services to mobile users with guaranteed quality of service (QoS). Call admission control is a very important measure in WCDMA system to guarantee the quality of the communicating links. Two throughput-based admission control strategy with multi-services, referred to herein as the complete partitioning CAC (CP-CAC) and the queuing priority CAC (QP-CAC), supporting real-time (RT) and non-real-time (NRT) services are analyzed and compared. The main contribution of this paper is the development of an analytical model for the QP-CAC algorithm which can be easily extended and used for CP-CAC. Furthermore, our analysis relaxes the typically used assumptions of equal channel holding time and equal resource usage for RT and NRT calls. More importantly, the analytical model covers the case when each traffic class has different requirements in terms of bandwidth, buffer size, average channel holding time, average time out, and Eb/No requirements. We also develop a simulation tool to test and verify our results. Finally, we present numerical examples to demonstrate the performance of the proposed CAC algorithms and we show that analytical and simulation results are in total agreement.