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In this paper, the authors propose a secure cooperative data downloading framework for paid services in Vehicular Ad hoc NETworks (VANETs). In their framework, vehicles download data when they pass by a Road Side Unit (RSU) and then share the data after they travel out of the RSU's coverage. A fundamental issue of cooperative data downloading is how vehicles effectively share data with each other. They develop an application layer data sharing protocol which coordinates the vehicles to relay data for sharing according to their positions. Such coordinated sharing can avoid collisions in the Medium Access Control (MAC) layer and the hidden terminal issue in multi-hop transmissions.
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