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Improving the QoS of VoIP over WiMAX Networks Using OPNET Modeler


Bassam M. AL-Mahadeen and Ameen Al-Mseden


Vol. 17  No. 8  pp. 132-142


As a rapidly growing technology, voice over Internet Protocol (VoIP) enables the transmission of voice data over Internet Protocol (IP)-based networks. VoIP has become an alternative solution for the public switched telephone network given its capability to transmit voice data in the form of digital IP packets over TCP/IP-based Internet, particularly with the significant deployment that occurred in the standard of Worldwide Interoperability for Microwave Access (WiMAX, IEEE 802.16) networks. This study investigates the performance of VoIP traffic over WiMAX networks by using various voice codec schemes and by considering several realistic networking scenarios. The Optimized Network Engineering Tool (modular 14.5) was used to measure and analyze a set of quality of service parameters, including mean opinion score packet loss, jitter, and delay. Simulations results indicate that the improved selection of voice codecs and statistical distribution significantly affect VoIP performance in WiMAX networks..


BE, ertPS, nrtPS, QoS, rtPS, UGS, WiMAX, VoIP Codecs.