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The high mobility of VANET makes information exchange across the network excessively difficult. Traditional approaches designed for stationary networks are not applicable due to the high dynamics among the nodes. Applying the routing techniques tailored for general mobile networks inevitably brings huge traffic burden to the crowded urban VANET and leads to low efficiency. To make the information...
In this paper, we present our study of extracting a mobility model for vehicular ad hoc networks (VANETs) from a large amount of real taxi GPS trace data. In order to capture characteristics of the urban vehicle network from microscopic to macroscopic aspects, we design three parameters and extract their values from the GPS trace data. Using this mobility model, we can generate the synthetic trace...
Inter-contact time between moving vehicles is one of the key metrics in vehicular ad hoc networks (VANETs) and central to forwarding algorithms and the end-to-end delay. Due to prohibitive costs, little work has conducted experimental study on inter-contact time in urban vehicular environments. In this paper, we carry out an extensive experiment involving thousands of operational taxies in Shanghai...
Rapid advancement in wireless communication has made it possible to develop vehicular ad hoc networks, in which a vehicle can communicate with other vehicles via a wireless, multi-hop fashion. A variety of appealing real-world applications can be enabled by VANETs, such as driving safety and urban monitoring. Many location based routing algorithms have been proposed for data delivery in VANETs. Most...
In this paper, we present passive geographical routing protocol (PGR), a routing mechanism particularly designed for vehicle ad hoc networks (VANET). PGR has no route discovery phase which is needed by DSR or AODV. In PGR, each node periodically disseminates its location and velocity information along four orthogonal directions of its velocity to distribute routing state in the network. Data packets...
In performance studies of vehicular ad hoc networks (VANETs), the underlying mobility model plays an important role. Since conventional mobile ad hoc network (MANET) routing protocols do not work efficiently in vehicular environments due to the rapid topology changes, the Delay-Tolerant Network (DTN) model is often applied. In this paper, we construct a new mobility model, the Shanghai Urban Vehicular...
Currently, vehicular ad hoc networks (VANET) has been paid much attention. Also, we utilize 4000 taxis and 1000 buses equipped with GPS-based mobile sensors in Shanghai city, which constitute a GPS-based vehicular networks if we assume that vehicles can communicate with each other. Unfortunately, these sensors are set with long sampling interval by the taxi or bus companies, such as 1–2 minutes. In...
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