Performance Evaluation of MANET Routing Protocols with Scalability using QoS Metrics of VOIP Applications

Mobile Ad Hoc Networks (MANET) is wireless network without infrastructure, where every node functions as transmitter, router and data sink. As many previous works have shown that the routing performance is greatly dependent on the availability and stability of wireless links. With the growth of the Internet services, Voice over IP (VoIP) has been playing a key role in cutting the costs of telephone calls. It can be seen that since demand of VoIP over wireless network is growing, use of VoIP over Mobile Ad-hoc Network (MANET) is expected to grow as well. This paper aims to compare performance of three routing protocols for Mobile Ad-Hoc networks (MANET’s). Since routing is a critical issue in MANET, so the focus of this paper along is the performance analysis of routing protocols. We compared three routing protocols i.e. AODV, OLSR and TORA and its simulated in OPNET modeller tool. The performance of these routing protocols is analyzed by five matrices: delay, network load and throughput, jitter, mean opinion score. All the three routing protocols are explained on a deeper level with matrices. The comparative study of protocols will be conducted and in the last the conclusion will be presented as to which routing protocol is the best one for mobile ad hoc networks. The final valuation is presented at the end of this paper. Keywords— MANET, AODV, OLSR, TORA, OPNET, VOIP