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ABSTRACT:Mobile ad hoc network is a collection of wireless mobile nodes which are capable of exchanging information dynamically among themselves without the need of any fixed infrastructure. Inorder to transfer data among these mobile nodes, the process of routing is adopted, which makes use of a routing protocol inorder to select a path along the mobile nodes in the network, through which data packets are sent. Due to dynamic nature of mobile ad hoc networks, links setup between the mobile nodes break most frequently and hence a routing protocol must be efficient enough in handling such situations and should deliver better performance in every aspect. In this paper, the performance of three routing protocols AODV, DSDV and DSR has been analysed using Network Simulator-2. Their performance is evaluated using Quantitative metrics -packet delivery ratio, average end-to-end delay, normalized routing load and jitter by varying node density and node mobility. The simulation results the routing protocol which gives better performance in various scenarios.

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Mobile Adhoc Networks are self configuring,infrastructureless network (i.e) a network without any existing network infrstructure or centralized administrationn. To faclitate communication among the nodes in MANET, multiple hops are needed due to the limited range of wireless network interfaces. In order to exchange data among the nodes ,a routing protocol[1] is used to discover the routes. The goal of routing protocol is to efficiently construct a route between a pair of nodes with minimum routing overhead and bandwidth consumption. In this paper, the performance of the best mobility model with the use of AODV routing protocol is implemented. Link breaks and Average Link Changes are calculated for different mobility models like Random Walk,Gauss Markov,Manhattan using BONNMOTION 2.1a [5] by varying the Network Size,Simulation Time and Transmission Range in order to decide on the best mobility model . Further the correctness of the best mobility model is investigated by the assessment of performance paramaeters like packet delivery ratio (PDR), average end to end delay, and throughput. . NS-2.35[6] was used to produce the networks, services and situation personality. According to the simulation study,the best mobility model is manahattam mobility model with less number of link breaks and average link changes and also with the instigation of performance metrics. Keywords: Mobile Ad Hoc Network, Mobility Model,Bonnmotion-2.1a,AODV,NS-2.35 I. INTRODUCTIONA mobile ad hoc network (MANET) represents a system of wireless mobile nodes that can freely and dynamically self -organize into arbitrary and temporary network topologies, allowing people and devices to seamlessly communicate without any preexisting Infrastructure. An ad hoc routing protocol is a convection or standard that controls how nodes come to agree on which way to route packets between computing devices in a MANET. Nodes do not have a priori knowledge of the topology of the network around them; they have to discover it. The basic idea is that a new node announces its presence and listens to broadcast announcements from its neighbors. The node learns about new near nodes and ways to reach them, and announces that it can also reach those nodes. As time goes on, each node knows about all the other nodes and one or more ways of how to reach them. The mobility models have a considerable effect on the performance of these routing protocols. Ad hoc networks are formed spontaneously and deployed during an emergency. The mobile nodes in the networks will freely move and communicate with each other. Due to high mobility an dynamic changing topology, a suitable mobility model for a particular network scenario. The change in mobility model affects the performance of routing protocols.

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