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This paper addresses a hybrid approach on message propagation in vehicular networks. Short-range Vehicle-To-Vehicle (V2V) communications cannot always guarantee connectivity to the network cloud, especially when traffic density is very low. By utilizing existing wireless network infrastructure it is possible to greatly enhance the capabilities of short range V2V technologies. Such existing and future communications infrastructure includes UMTS, HSDPA,Wi-Fi, and WiMax. For this multi-network environment the authors analyze how messages are forwarded by vehicles communicating via a hybrid protocol exploiting both short-range V2V communication schemes and Vehicle-To-Infrastructure (V2I) concepts.
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