International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Modified Congestion Re-routing scheme using centralized Road side Unit Divya.R1, Suganthi.V3, Jayachitra.J3 1UG
Scholar, Department Of Information Technology IFET College Of Engineering, Villupuram 2Associate Professor, Department Of Information Technology IFET College Of Engineering, Villupuram 3Associate Professor, Department Of Information Technology IFET College Of Engineering, Villupuram ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract- In order to face traffic congestion, there is need
to eliminate traffic in an automated process. Centralized solutions to alleviate congestion, suffer from scalability and privacy problems such as the central server has to perform intensive computation with the vehicles in real-time and the drivers have to share their location of both origins and destinations of their trips with the server. This article proposes a centralized RSU (Road side unit) which offloads a large part of the rerouting computation at the vehicles, and thus, the rerouting process becomes practical in real-time. The RSU is a computing device located on the road side that provides connectivity support to passing vehicle. As RSU supports cooperative and distributed applications, it works together with vehicles to coordinate actions and process several types of information. Ns2 simulation is used to evaluate the performance of RSU backbone routing. Thus Simulation results that the proposed RSU technique provides detailed information for each vehicle with an individual information range of more than 50km from the current position with low delay and high accuracy. Key Words: RSU, Adaptive path rerouting, DSRC, IEEE 802.11P, VANET, SCRP
1. INTRODUCTION
Now a day, Congestion is a serious problem with high populations for big cities. Google maps traffic of internet based solutions are not adequate for instant response to fine grained traffic, highly dynamic and congestion control. Vehicles that are already in congested areas are advise against the use of certain roads, and the VANET-assisted communication helps nearby vehicles to re-route themselves around sudden traffic jams. It is not possible to achieve such impact via Internet-based solutions that, act on the order of tens of minutes; rather than milliseconds. To tackle all these problems, this article proposes a centralized RSU, a road side unit for congestion avoidance, which supports both VANET communication and cellular internet. As it uses a server, reachable over the Internet, to determine an accurate global
Š 2017, IRJET
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view of the traffic. The RSU, a centralized server acts as a coordinator that collects location reports, distributes rerouting notifications to the vehicles and detects traffic congestion in the main traffic environment. However, the centralized RSU system offloads a large part of the re-routing computation and thus the re-routing process becomes practical in real-time. Unlike the other systems proposed in the field, the RSU does not require a global knowledge of the congestion levels on the map, but rather only the congestion levels of the roads that the vehicle might take. The vehicles situated in the same regions can exchange messages over VANETs. VANET allows vehicles to connect with RSU and they latter connected to the Internet, forming a fixed infrastructure that offers the capability of communicating with roaming vehicles each other. Also, there is a privacy enhancement protocol to be used to protect the users’ privacy. RSUs have been used for different roles such as service proxies, location servers, traffic directories, security manager and data disseminators. When congestion are detected, the server sends the traffic map only to the vehicles that sent the latest updates. The experimental evaluation shows that the system is more reliable: In any case it performs better than a completely offline shortest-path calculation (e.g., Dijkstra), and its benefits increases as the level of congestion increases.
1.1 EXISTING SYSTEM Several routing schemes are suggested to eliminate these issues. Nearly all of the schemes are based on blind decision based. Whenever the vehicle reaches the intersection area it will select the shortest path between source and destination, for example GSR, GPSR, GYTAR, GPCR, and A-STAR are previous approach algorithms. However these techniques are aimed to reduce the overall delay, they will cause the higher traffic of packets it leads to maximum delay. In empirical path loss models were developed in four different vehicle-to-vehicle environments, i.e., highway, rural, urban and suburban. In analysis of onedimensional, an analytical model was proposed to investigate the connectivity of VANETs in the presence of Rayleigh, Rican and Weibull channels, from a queuing ISO 9001:2008 Certified Journal
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