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VANETs) that provides a vehicle with data about 1-hop neighboring vehicles. Data provided by this service can be used to support safety applications, such as the efficient selection of forwarders for safety messages and dissemination of early warnings to drivers about potential dangers of the road. This paper discusses the limitations of the beaconing service in providing vehicles with safety-related...
In vehicular networks many applications and services require the use of vehicle position, which is typically obtained from off-the-shelf Global Positioning Systems (GPS). However, GPS' position accuracy is low and the GPS receiver relies on line-of-sight signalling from the satellites. For the sake of application consistency, when the GPS position is not received due to signalling failures, vehicular...
In Intelligent Transport System (ITS) there is a new kind of ad hoc network: Vehicular Ad-hoc Networks (VANET). In VANET, vehicles get useful information by communicating with each other or with a roadside unit. The location information is important in VANET. It is easy to obtain the locations of vehicle by GPS technology. However, there still are some unexpected problems such as not always being...
Mobile Vehicular Clouds are emerging as systems architectures suitable to provide services to both drivers and external customers. The paper describes a Pics-on-Wheel architecture and prototype implementation based on the idea of open mobile cloud. A simulation study based on San Francisco taxi cab traces shows that the Pics-on-Wheel service yields latencies in the order of 5 minutes in well frequented...
VANET (Vehicular Ad-hoc Network) that is used for vehicular-to-vehicular and vehicular-to-roadside communication is well known as one of the representative application of ad hoc networks. One of the representative mechanisms is Epidemic Routing that adopts the concept of Store-Carry-Forward. However, in Store-Carry-Forward mechanism, each node stores data packets in the buffer, and whenever the node...
In vehicular ad hoc networks (VANET), Inter-Vehicle real-time information access and transfer is the key problem to solving or reducing traffic accidents. It is possible to locate and track a vehicle based on its transmissions, during communication with other vehicles or the road-side infrastructure. On the basis of vehicle active safety technology, this paper proposed a new message broadcast mechanism...
We discuss the accuracy of a mechanism, called Oracle, to assess position and transmission ranges in VANET. We prove that, in the best case, the assessments of the oracle are exact. Moreover, we prove that the average case of the Oracle coincides with its best case. Therefore the Oracle is optimal. The errors that afflict the assessments of both the positions and the transmission ranges depend on...
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