International Journal of Computer Information Systems, Vol. 5, No.5, 2012 Simulation-based Performance evaluation of stability in different mobility model using routing protocols in MANET C.Rajan AP/IT KSR College of Technology Tiruchengode, india. rajanksrct@gmail.com Dr.N.Shanthi Professor/IT KSR College of Technology Tiruchengode, india. R.Mohan, M.Tech(IT ) KSR College of Technology, Tiruchengode, India. Abstract— A Mobile Ad-Hoc Network (MANET) is a self- configuring network of mobile nodes connected by wireless links to form an arbitrary topology without the use of existing infrastructure. In this paper, we have studied the effects of various mobility models on the performance of two routing protocols Ad-Hoc On-Demand Distance Vector Routing Protocol (AODV-Reactive Protocol) and Dynamic source Routing (DSR-Proactive Protocol) to evaluate a Stable and Reliable Mobility Model for MANET Routing Protocol. For experimental purposes, we have considered four mobility scenarios: Random Waypoint, Group Mobility, Freeway and Manhattan models. These four Mobility Models are selected to represent the possibility of practical application in the future. Performance comparison has also been conducted across the varying Node Speed. Experimental results illustrate that performance of the routing protocol varies across different mobility models, Node Speed. Keywords- MANET, Throughput, End-to-End Delay, Packet Delivery Ratio, Routing overheads, Packet loss, AODV, DSDV, RWPM, RPGM, MGM, Freeway. I. INTRODUCTION A Mobile Ad-Hoc Network (MANET) is a self-configuring network of mobile nodes connected by wireless links, to form an arbitrary topology. The nodes are free to move randomly. Thus the network's wireless topology may be unpredictable and may change rapidly. Minimal configuration, quick deployment and absence of a central governing authority make ad hoc networks suitable for emergency situations like natural disasters, military conflicts, emergency medical situations etc. [1] [2]. Simulation studies of MANET routing protocols have mostly assumed Random Waypoint (RW) as a reference mobility model [3], [4]. In order to examine many different MANET applications there is a need to provide additional mobility models. Typical examples are modeling a movement in the city street environment, university campuses and the movement of groups of nodes, e.g. for specific military purposes. Recently, a performance comparison of DSR and AODV protocols based on the Manhattan Grid (MG) model has been published [5]. A performance study of DSR and AODV considering a probabilistic random walk and the boundless simulation area has been presented in [6]. A performance evaluation of DSDV and AODV using scenario based mobility models has been presented in [7]. A comparative analysis of DSR and DSDV protocols, considering RW, Group Mobility, Freeway and MG models can be found in [8]. The objective of this work is to provide a systematic and comprehensive comparative analysis of the two typical representations of MANET routing protocols, DSDV (Proactive Routing Protocol) and AODV (Reactive Routing Protocol), with respect to the four mobility models. They include Random Waypoint Mobility Model, Reference Point Group Mobility Model, Freeway and Manhattan Mobility Model. Performance analysis and comparison encompass Packet Delivery Fraction, End-to-End Delay, Throughput, and Packet Drop with respect to different node speeds and network size. The analysis covers a wide range of MANET scenarios and aims to be useful in a variety of applications, for the purpose of network research, design and implementation. II. OVERVIEW OF ROUTING PROTOCOLS Considering procedures for route establishment and update, MANET routing protocols can be classified into three types:  Proactive Protocols  Reactive Protocols and  Hybrid Protocols. Proactive or table-driven protocols attempt to maintain consistent up-to-date routing information from each node to every other node in the network. Each node maintains tables to store routing information, and any changes in network topology need to be reflected by propagating updates throughout the network. Reactive or on demand protocols are based on source-initiated on-demand reactive routing. This type of routing creates routes only when a node requires a route to a destination. Then, it initiates a route discovery process, which ends when the route is found. Hybrid protocols combine proactive and reactive schemes. November Issue Page 22 of 48 ISSN 2229 5208