© 2014, IJARCSSE All Rights Reserved Page | 766 Volume 4, Issue 9, September 2014 ISSN: 2277 128X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: www.ijarcsse.com Enhanced DV Cast Protocol for Data Dissemination in Urban Traffic R. Gunavathi, A. Akilapriya PG Department of Computer Applications PG Department of Computer Applications Sree Saraswathy Thyagaraja College Sree Saraswathy Thy Agaraja College, India Abstract-This paper attempts to give the solution for the urban scenario using DV cast protocol. Normally DV cast protocol is the best solution for highway traffic. But this paper proposed urban dv cast (UDV) protocol to deal with the urban traffic. This UDV protocol is extension of DV cast protocol. Our aim is to address the urban scenario where vehicles are equipped with sensors or wireless devices to identify the hazards. Urban DV cast (UDV) protocol is used to disseminate data efficiently in urban traffic. It suppresses the Broadcast storm which is the main problem in data dissemination because of data collisions and contentions in dense network. Store-carry-forward method is efficiently carried data with the disconnected networks. Urban roads are different from that of highways. It has many entry points or intersections. This protocol highly works well in urban network. Keywords-DVCast protocol,urban dv cast protocol, broadcaststorm, store-carry-forward, data dissemination I. INTRODUCTION Vehicular ad-hoc network (VANET) is most popularly used to regulate traffic.VANET ensures safety,efficiency,security in data dissemination.Vehicles are equipped with sensors or wireless devices, so it can sense the road environment and gather details about the accidents, hazards, pollution and weather report. These wireless devices collect the data about environment and provide data dissemination to nearby vehicles.In dense network data can be broadcasted by all the vehicles at the same time,it might be a chance to occur broadcast storm.It means that data can be collided and contentions will heavily occur.It can be suppressed using the suppressed broadcasting technique.In sparse network,data cannot be easily disseminated because vehicles are spread in the network. So we use a method called store- carry-forward method. The data can be stored by one vehicle when it encounters the other vehicles it can pass the data to it. In this paper we concentrate on the urban roads so road topology is important. The vehicles are formed of clusters moving in one direction to cope with separate vehicle clusters as in[1][2].The impact of this work lies in combining the adaptive optimized broadcastsuppression technique and store-carry-forward method in a single data dissemination protocol known as urban DV cast protocol (UDV protocol).This protocol works well in dense and sparse network. When compared with other protocols, DV cast protocol works well in dense and sparse network. Normally DV cast protocol is used for highway but in this work proposed that the DV cast protocol disseminates data in urban network. By simulating various urban scenarios, UDV cast protocol is works well and it is directly compared with DV cast protocol.This paper provides the data dissemination with the high level of reliability, security, efficiency. Consider that vehicles are equipped with IEEE 802.11p and it can focus only on vehicle-to-vehicle communication. Urban roads are concentrated using broadcasting protocol. Urban roads have many entry and exit points. It can also have intersections. Based on the information provided by GPS, the vehicle can identify the dense and sparse traffic. The remainder of this paper is organized as follows:Section 2 provides a comparison between UDV and Other protocols with respect to suppression technique and protocols that works with the sparse networks. Section 3 provides the UDV protocol in detail. Section 4 describes the simulationof our protocol under different traffic conditions. Finally section 5 concludes this paper and outlines of future directions. II. RELATED WORK VANET provides many solutions for the data dissemination under various traffic control. Many protocols support dense and sparse scenarios in road traffic. In dense scenarios, suppression techniques are used to lessen the broadcast problem. In sparse scenarios, store-carry-forward technique is used to disseminate data. In this paper particularly focus on DV cast protocol which disseminates data in dense and sparse scenario. DV cast protocol has three techniques, slotted 1-persistence, weighted slotted 1-persistence, and slotted p-persistence. Among these techniques slotted 1-persistence provides better data dissemination than other two protocols. In slotted 1-persistence, message can be generated in accident/hazard occurred direction and disseminate data to all vehicles in message originated direction. The vehicles are slotted based on time slots and message is disseminated to each slots. Source vehicles can disseminate data to most distance vehicle in particular direction. The source vehicle can