IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 08, 2015 | ISSN (online): 2321-0613 All rights reserved by www.ijsrd.com 469 A Enhancement in AODV-Reactive Topology based Routing Protocol in VANET Mr. Biraju J. Trivedi 1 Prof. Hitesh C. Patel 2 1 P.G. Student 2 Assistant Professor 1,2 Department of Information Technology 1,2 Kalol Institute of Technology and Research Center Kalol, India Abstract—Vehicular Ad hoc Networks [VANET] is current active research area and one of the fastest emerging trends for research as there are many issues and challenges to be addressed by the researchers before the technology becomes commercialized. Vehicular ad hoc network is a self- organizing and infrastructure les network used to provide communication between vehicles to vehicle (V to V) and vehicle to road side units (RSU) and it is also subclass of mobile ad hoc networks (MANETs). The main objective of VANET is to builds a robust network between mobile vehicles so that vehicles can talk each other for safety of human beings. Ad hoc on demand distance vector (AODV) routing protocol is one kind of reactive protocols and it creates a route only when it needed. It can be applied to large scale ad-hoc network. AODV is required to overcome the problem of link failure during data transfer from source node to destination node. AODV provides loop free routes even while repairing broken links. Ad hoc on demand vector has the ability to unicast and multicast routing and it uses destination sequence number and it reduce excessive memory requirement and the route redundancy. In this work mainly focus on enhancing performance and capability and robust AODV protocol for VANET. Use different parameter Range, RREQ, RREP, Threshold, PDR, end to end delay Control information overhead minimizes and communication establishes minimize time algorithm efficient. Key words: VANET, AODV, RREQ, RREP, Routing Protocol, PDR I. INTRODUCTION The basic concept of VANET is straight forward: take the widely adopted and inexpensive wireless local area network technology that connects notebook computers to each other and the Internet, and, with a few tweaks, install it on vehicles.[13] A Vehicular Ad hoc network (VANET) turns each and every participating car into a wireless router or node, allowing cars approximately 100m to 300m of each other to connect and, in turn, create a network with a broad range. The main objective of VANET is to builds a robust network between mobile vehicles so that vehicles can talk each other for safety of human beings. Rest of the paper is arranged as follows: In section II Literature Review, In section III Routing Protocols, In section IV Proposed Concept, In section V Simulation Results and Analysis, In section VI Concludes the paper and last Contains References. II. LITERATURE REVIEW A. VANETs- A Survey on Routing Protocols and Issues This survey paper has given differences among major classifications of routing protocols. In this brief study on various VANET routing protocols; different related research issues and challenges/difficulties are represented that require more effort and research to address them. B. Ad-hoc On Demand Distance Vector Algorithm (AODV) In this paper AODV can finds route quickly and accurately For 50 nodes, the good put ratio is consistently above 96% For 100 nodes the good put ration approximately 94% but then decease to 90% AODV over network of 50 nodes and achieve good put ration between 97% to 100% Intelligent OLSR Routing Protocol Optimization for VANET C. Improved Neighbor Detection Algorithm for AODV Routing Protocol. If an AODV message like Hello, RREQ, RREP, etc. is received, the SNR of the link measure when the packet was received must be greater than a certain upper limit defined as “THRESHOLD”, otherwise the AODV message is ignored; If an AODV message like Hello, RREQ, RREP, etc. is received from a node, which is a neighbor in the routing table, the SNR must be higher, otherwise the AODV message is ignored D. AODV Based Improved Method for Detecting Good Neighbor Nodes By simulating new methods it is seen that our protocol has better signal strength and flow capacity. We proposed reliable AODV routing protocol which enhances network performance by selecting stable nodes (i.e, only good neighbor nodes) for network formation. Store all information related to good nodes in routing table .This will improve network performance. Increase in network performance is better for communication. In future, we may need to classify good nodes from bad nodes from security point of view and so packet drop ratio will be reduced. III. ROUTING PROTOCOL In routing protocols there are classified into five categories which are as following like Topology based, Position based, Cluster based, Geo cast and last is broadcast A. Topology Based Routing Protocols In topology based routing protocols use link’s information within the network to send the data packets from source to destination. Fig. 1: Types of Topology-based Routing