From the analysis of feasible applications in the field of vehicular networks it clearly emerges that a key factor for their success will be granting vehicles a constant connection to the Internet, able to provide QoS support. Unfortunately, in spite of these strong requirements, gaining Internet connectivity in a VANET is a very challenging objective. In this paper, we discuss some cross-layer principles that could drive the augmentation of widely accepted and deployed protocols, such as SIP at the application level and AODV at the network level, to provide vehicular users with the best available Internet access.
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