International Journal of Computer Science Issues

More than a traditional journal...

For developing countries, wireless networks seem to be the available alternative for providing affordable telecommunications services. In Iraq, the main governmental wireless Internet service provider is SCIS Company. It adopts WiMAX and WiFi wireless networks. Considering Quality of Service (QoS) as an indicator of network performance, it is a challenge for the Wireless Internet Services Provider (WISP) to build an infrastructure network that can provide end-to-end QoS for applications with variety of QoS needs, such in the case of SCIS WiFi network. In this paper, the wireless network of one of the main Internet Service Providers in Iraq is adopted to be modeled and analysed. This paper presents the modeling and analysis of SCIS WiFi network by using OPNET Modeler. End-to-End QoS Mapping (E2EQM) scheme is implemented on SCIS WiFi network to improve its performance. Good performance improvements are obtained by applying E2EQM scheme to the modeled network. Comprehensive analyses and comparisons are performed in terms of evaluating criteria by using delay sensitive applications and delay insensitive applications. The simulation results show that the E2EQM scheme increased the network throughput by 5 % and decreased the delay by 44 %.