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Multi-hop broadcast is a key technique to disseminate time-sensitive event-driven safety Warning Messages (WMs) in Vehicular Ad hoc NETworks (VANETs). Due to the lossy nature of the vehicular wireless environment and the fact that the implementation of broadcast at the link layer uses unreliable transmissions (i.e., lack of positive ACKs), highly reliable, scalable, and fast multi-hop broadcast protocol is particularly difficult to design in VANETs with lossy links. Schemes that use redundant network layer broadcasts have been proposed. However, the tradeoff between reception reliability and transmission count in such schemes needs to be carefully considered.
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