Vehicular networks are distributed, self-organizing and highly mobile ad hoc networks. They allow for providing drivers with up-to-the-minute information about their environment. Therefore, they are expected to be a d...
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ISBN:
(纸本)9783642176036
Vehicular networks are distributed, self-organizing and highly mobile ad hoc networks. They allow for providing drivers with up-to-the-minute information about their environment. Therefore, they are expected to be a decisive future enabler for enhancing driving comfort and safety. This article introduces the Vehicular Information Space framework (VIS). Vehicles running the VIS form a kind of distributed database. It enables them to provide information like existing hazards, parking spaces or traffic densities in a location aware and fully distributed manner. In addition, vehicles can retrieve, modify and delete these information items. The underlying algorithm is based on features derived from existing structured peer-to-peer algorithms and extended to suit the specific characteristics of highly mobile ad hoc networks. We present, implement and simulate the VIS using a motorway and an urban traffic environment. Simulation studies on VIS message occurrence show that the VIS implies reasonable traffic overhead. Also, overall VIS message traffic is independent from the number of information items provided.
Distributed information management is particularly powerful in vehicular networks. For example, it enables vehicular communication systems to persistently provide up-to-the-minute information about accessible parking ...
详细信息
ISBN:
(纸本)9781424477425
Distributed information management is particularly powerful in vehicular networks. For example, it enables vehicular communication systems to persistently provide up-to-the-minute information about accessible parking spaces, existing hazards or traffic densities and to keep these items up to date. The Vehicular Information Space framework (VIS) implements distributed information management. Vehicles running the VIS form a kind of distributed database. They are able to provide information items in a location-aware and fully distributed manner. Moreover, they can retrieve, modify and delete these items. For this purpose, the VIS divides the vehicular network into separate, interacting segments each running the VIS structured P2P Algorithm (VSPA). This article focuses on the VSPA's design, implementation and evaluation. The algorithm is based on features derived from existing structured P2P algorithms and extended to suit the specific characteristics of vehicular networks. Simulation studies show that the VSPA overlay state maintains consistent given long-run simulations. On inconsistencies, the overlay stabilizes rapidly. This is evaluated using an urban traffic environment implying few messages for network adjustments. Also, it is examined on a motorway given high vehicular density and high data load to investigate scalability. Finally, we show that the VSPA is able to rebuild an overlay in case of a network breakdown.
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