Performance evaluation of routing protocols based on different models in MANET

A mobile adhoc network is an independent system of mobile stations associated by wireless link to form a system. This system can be modeled in the form of an uninformed graph. Adhoc networks are peer to peer, multihope networks were data packets are transmitted to a source to destination through intermediate nodes (which serve as router). The infrastructure is not the main issue to setup MANET and it can be setup anytime, anywhere. This paper presents the comparison of AODV, LAR1 and DSR routing protocols with three different models like increasing the number of nodes, increasing the pause time and increasing the speed of nodes. Performance of the above mentioned work are done on the attributes like throughput, packet delivery ratio, drop ratio and end-to-end delay). The performance of these three routing protocols is done on Glomosim Simulator and we concluded LAR1 has better throughput in comparison to both AODV and DSR routing protocols in all three scenario. Packet delivery Ratio behaves like throughput, LAR1 has better PDR in comparison to AODV and DSR. Drop ratio is also similar to PDR, actually it is reverse of PDR so we can say that LAR1 has lower drop ratio in comparison to AODV and DSR. AODV and DSR have lower delay in comparison to LAR1. LAR1 routing protocol has higher delay, and it is also seen that as we increase the nodes, pause time and mobility delay is also increase.