Vehicle density information is crucial for efficient functioning of many vehicular applications including emergency notification, driver assistance and infotainment applications. This information is used for evacuation planning in accident scenarios, finding alternate routes in case of road congestion, and providing stable routing paths for uninterrupted internet connection. In a city scenario, it is a tedious task to collect and share large volume of data containing density information. In this paper, a mechanism is proposed to create a density map for city environments. A hierarchy (i.e. tree) is established, where a node represents a road segment and the density is used to determine the height of the node; the root node represents the road segment having highest node density. The purpose of this tree is to multi-level collection and aggregation of density information at till the root node is reached. Then, the aggregated density information (i.e. density map) is forwarded down the hierarchy. Simulation results show that the proposed mechanism allows highly accurate computing of density map while generating low network overhead.


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    DMAP: Density Map Service in City Environments

    Sahu, Pratap Kumar / Hafid, Abdelhakim / Cherkaoui, Soumaya | IEEE | 2015


    DMAP: Density Map Service in City Environments

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