Performance Evaluaion of QoS of VoIP over WLAN and WiMAX Networks using OPNET

Abstract

In recent decades the use of real-time applications like Voice over Internet Protocol (VoIP), over wireless communication technologies such as Wireless Local Area networks (WLANs) and Worldwide Interoperability for Microwave Access) have increased significantly. Because VoIP is a real-time application, it is highly sensitive to network performance and required a specific level of Quality of Service (QoS). The aim of this study is to evaluate  and compare the performance of VoIP applications over WLAN and WiMAX technology. Optimized Network Engineer (OPNET Modeler) is used to conduct the experiments. VoIP QoS parameters ( jitter, Packet loss, and delay ) are evaluated, and the  results show  that VoIP performance   in the WiMAX environment is better than  that in the  WLAN environment.