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Most of the envisioned services over vehicular networks need to deliver information to all vehicles inside a certain region. Several such broadcasting protocols have been reported so far, but surprisingly only one of them addresses the issue of intermittent connectivity. In this paper, the authors present a broadcast protocol which is suitable for a wide range of vehicular scenarios and traffic conditions. The protocol employs local position information acquired via periodic beacon messages. Beacons are used by cars to decide whether or not they belong to a Connected Dominating Set (CDS). Vehicles in the CDS use shorter waiting period before possible retransmissions.
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