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Today's mobile computing environments aggregate many entities, all of them with a number of internal sensors, processing applications and other, user given information that can be shared with others over the available networks. Tomorrow's ubiquitous computing environments, where the number of sensors is assumed to be even significantly higher, face the challenge that information exchange between entities...
We present a lane-based clustering algorithm designed to provide stability in cluster lifetime for vehicular ad-hoc networks (VANETs) in urban scenarios. Stable clustering methods reduce the overhead of re-clustering and lead to an efficient hierarchical network topology. During the creation of VANET clusters, cluster members select one member to be the clusterhead. Fewer clusterhead changes result...
Vehicular ad hoc network (VANET) is a special class of wireless mobile communication network. For vehicle-to-vehicle (V2V) communication, suitable routing protocols are needed. A routing metric combining hop counts and retransmission counts at MAC layer is proposed with consideration of link quality and delay reduction. Based on the new routing metric, a cross-layer ad hoc on-demand multipath distance...
Vehicular communication system is a key part of intelligent transportation system (ITS) while vehicle safety communication (VSC) is a major target of vehicular communication. The use of radio frequency identification (RFID) system for vehicular communication has been proposed for pedestrian-safety. In this paper, an extended RFID system and infrastructure for vehicle safety communication through co-operative...
Vehicular ad-hoc networks (VANET) belonging to family of ad-hoc uses IEEE 802.11p standard which have received considerable attention in many vehicular projects and industry groups. VANETs are a special kind of mobile ad-hoc networks where wireless-equipped (road-side) vehicles form a network with no additional infrastructure. While many communication scenarios exist for these networks, In VANET project...
In a vehicular ad hoc network (VANET), an information can generally be disseminated by using either a multi-hop broadcasting protocol or a single-hop broadcasting protocol. While in our earlier work we analyze the connectivity requirements in a network that employs a multi-hop broadcasting protocol, in this paper we extend our analysis to model the connectivity in a network that uses a single-hop...
In this paper, we present ReWarn, an opportunistic relay scheme for cooperative collision warning in VANET, which helps to mitigate the impact of package loss caused by shadow fading. When safety messages in VANET, e.g., collision warning messages, are broadcast in air, a vehicle may detect collision risks both of its own and of its neighbors'. If a vehicle has detected its neighboring vehicles are...
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