Performance Evaluation of the CDMA/GPS-DW Model Considering a Preemptive Priority Scheme in Mobile Cellular Networks

Abstract

This paper deals with the performance evaluation of the Code Division Multiple Access/Generalized Processor Sharing-Dynamic Weights (CDMA/GPS-DW) scheme with and without preemption of tasks for multimedia traffic, in cellular mobile systems. In this scheme, services are divided into four different classes: financial transactions, video, voice, and data (WWW service). Priority is given to financial transaction calls over the other services, that is, the right to preempt the service of WWW-data is given to financial transactions. The interrupted WWW-data call returns to the queue and it is resumed once new codes become available. In addition, admission control guarantees the required signal-to-noise ratio (SNR) for multimedia traffic. Computer simulations are proposed to study the system performance under criteria such as delay, dropping packets percentage, and throughput. A conclusion, based on experimental analysis, about which service to preempt is also presented.