Performance Evaluation of Dynamic Source Routing and Optimized Link State Routing in Mobile Ad-hoc Networks

Abstract

Mobile Ad Hoc Networks (MANETs) are a type of wireless ad hoc network, which is a self-arranging network of mobile nodes connected by wireless links. The mobile nodes are free to move randomly. There are some challenges that protocols designers and networks developers faced. These challenges include routing, service and frequently topology changes. Mobile nodes can receive and forward packets as a router. Routing is a critical issue in MANET; hence, the focus of this thesis along with the performance analysis of routing protocols. Focused was on two well-known protocols; DSR and OLSR. Our simulation tool used was OPNET modeler. The performance of these routing protocols analyzed using three metrics: delay, network load and throughput all results are time averages based on a 10 minutes time span. Routing protocols are explained in a deep way with metrics. The comparison analysis carried out through these protocols and in the last, the conclusion presented that which routing protocol is more compatible for mobile ad hoc networks. Simulation results showed that OLSR has better end-to-end delay under FTP traffic than DSR for all scenarios by 60.9%, 93.1% and 84.8 % in 10, 20 and 50 nodes respectively. Network load record a worst value under DSR protocol with 50 nodes that was 48851.7 bit/sec but OLSR was the better by 13.6% in 10 nodes, 54.6% in 20 and 4.6% in 50 nodes. Network throughput gave better values with DSR by 1 % in 10 nodes and 30.8 % in 20 nodes but in 50 nodes, OLSR was optimal by 46.8%. VI TABLE OF