Performance Evaluation of VOIP over Multi Radio Multichannel Networks.

Abstract — Wireless mesh networks provide a unique architecture and extend the connectivity of mobile devices by using multiple access points connected to the Internet and other access networks. Wireless mesh network (WMNS) is a key technology for supporting a variety of application scenarios. Recently, it evolves toward a multi-radio multi-channel (MR-MC) WMNS architecture, which can improve network performance by equipping each node with multiple radio interfaces and by using multiple non-overlapping channels. This evolution poses new challenges on network design. Performance evaluation and analysis of VoIP over multi radio multichannel network is essential in order to meet adequate QOS levels. This paper presents a study of real time voice communication QOS in terms of throughput, packet loss, MOS (mean opinion score) and end to end delay. Instead of using single radio schemes, we use multiple radios (interfaces) to increase bandwidth, capacity and decrease interference. We have also implement and compare the results of single-radio and multi-radio WMNSs by using QUALNET simulator