Abstract-Vehicular ad-hoc networks (VANETs) promise to vehicular traffic behavior and its impact on these general enable many novel applications in transportation systems in-types of applications. cluding accident avoidance, congestion sensing, traffic metering, Although they are a class of mobile ad hoc network and general in-car information services. Yet implementing multi-hop vehicular communications is highly challenging due (MANETs VANETs have unique behaviors. Vehicles can to the highly time-varying nature of vehicles. In addition to have very predictable movement that is (usually) limited node mobility and the impediments of wireless communication, to roadways. Roadway information is often available from a network comprised of moving vehicles is a dynamic system positioning systems and map-based technologies such as that can be fragmented into many individual components of GPS. Traffic density can vary significantly based on timedisparate connectivity. In this paper we describe and analyze a routing scheme that exploits this dynamic connectivity for of-day and day-of-week. With respect to connectivity, denthe purpose of message propagation of attributed (or labelled) sity plays a key role in enabling multihop communication. data in a fragmented VANET. Our analysis provides upper and Owing to the high, path-like mobility rate and varying lower bounds on message propagation rate as a function of the traffic density observed, a VANET is characterized by timetraffic density, vehicle speed, and radio range; and sheds light varying topology and connectivity [2]. Hence, the topology into the role played by each of these network parameters. An important insight from our analysis is that vehicle mobility in of VANET is usually partitioned, and is better described by a the opposite traffic direction can be used to achieve substantial fragmentation and fusion process. Fragmentation and fusion gains in message propagation rates. Our analytical findings lead to many problems with conventional MANET routing are supported by extensive simulations. The simulation results schemes, especially proactive ones. While existing routing indicate that under certain traffic conditions an increase in protocols have been investigated for applications in this vehicle mobility results in an order-of-magnitude increase in domain, few have tried to use the opportunistic connectivity provided by mobile vehicular nodes.
Further evaluation of this protocol in REF has shown that vehicle mobility can be used to improve message propagation in scenarios in which conventional MANET protocols would fail due to the lack of end-to-end connectivity.
Exploiting Downstream Mobility to Achieve Fast Upstream Message Propagation in Vehicular Ad Hoc Networks
2007 Mobile Networking for Vehicular Environments
2007 Mobile Networking for Vehicular Environments
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