C. Adler, R. Eigner, C. Schroth, and M. Strassberger (Germany)
Vehicular ad-hoc network (VANET), inter-vehicle commu nication (IVC), local danger warning (LDW), information dissemination, context adaptivity
Local danger warning (LDW) is one of the most promis ing active safety applications in vehicular ad-hoc networks (VANETs). Vehicles exchange information about the cur rent road condition and dangerous situations by using WLAN and are able to warn their drivers about upcom ing dangers. The information dissemination in particular sets up many requirements that are not entirely fulfilled by existing concepts. In this paper, a novel concept for a self-organizing and context-adaptive dissemination frame work that is capable of combining the advantages of exis tent routing, broadcasting and dissemination mechanisms is proposed. Message selection and medium access are based on a relevance function that makes use of the cur rent context and the content of the messages. Thus, at any time and in any situation, the message adding the highest global benefit to the system is disseminated. This means a paradigm shift in the efficient usage of bandwidth be cause available bandwidth is consumed as long as there is an increase in the global benefit. The main advantages of the proposed concept are high scalability, an optimal situa tion and network adaptability, implicit congestion control, and the autonomous formation of dissemination areas. The feasibility and the advantages of the proposed concept are shown by simulation studies which also assist in develop ing optimized relevance functions.
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