Abstract— Inter-vehicle communication (IVC) is emerging in research prominence for the interest that is generating in all major car manufacturers and for the benefits that its inception will produce. The specific features of IVC will allow the deployment of a wide set of possible applications which span from road safety to entertainment. Even if, on the one hand, these applications share the common need for fast multi-hop message propagation, on the other hand, they possess distinct characteristics in terms of generated network traffic. The current research state of the art only proposes solutions specifically designed for a single application (or class) that are not directly extendable to a general IVC context. Instead, we claim that a privileged architecture exists, which is able to support the whole spectrum of application classes. To this aim, we propose a novel IVC architecture that adapts its functionalities to efficiently serve applications in quickly propagating their messages over a vehicular network. We conducted an extensive set of experiments that demonstrate the efficacy of our approach. As representative case studies, we considered two application classes that for their network traffic characteristics are at the opposite boundaries of the application spectrum: safety and entertainment.
IndexTerms—Inter-Vehicular Communication, Multi-hop Broadcasting, Networked Interactive Entertainment, Road Vehicle Safety.
WHETHER you love them or hate them, vehicles represent such a fundamental component in our society that cities like Los Angeles look more like being developed having in mind a car-population, rather than a human-population. Now, their influence in our life is going to become even more pervasive thanks to the forthcoming inter-vehicle communication (IVC) capabilities. Through these new communication capabilities, vehicles will provide several new services to their passengers while driving them around. A limited but representative list of new services that will be made available by the DSRC/IEEE 802.11p technology includes road vehicle safety, road navigation support, location-related commercials, and networked interactive entertainment. A feature typically shared by these services is that of having application messages transmitted through a multi-hop, ad-hoc IVC among a group of vehicles (namely a car platoon) covering an area of few kilometers. The problem in this context is that communications require very tight message delivery time to be effective: typically, under the threshold of few hundreds of milli seconds . Scientific literature reports that the propagation speed of messages decreases with the increase of vehicles that attempt to forward them over the multi-hop path toward destination and, in general, with the network traffic. Several approaches have been proposed, e.g., transmission rate adaptation, topology awareness-based optimization, intelligent election of message forwarders. Unfortunately, each of these schemes is affected by at least one of the following problems: redundant multi-hop transmissions, unrealistic assumptions about the vehicular environment, and generation of an elevate number of control messages. This causes an inefficient utilization of the (limited) available resources, thus negatively affecting the final performance of the system. Furthermore, this situation is exacerbated by the fact that different applications have peculiar characteristics, such as the generated network traffic, that existing solutions address in a specific way without a general vision. Instead, the efficiency of an IVC architecture should be independent from the application in use. To this aim, we propose a novel IVC architecture intended to permit fast...