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Wireless technologies, under the ''Anywhere, Anytime'' paradigm, offer users the promise of being always attached to the network. Mobile devices enabled with multiple wireless technologies make possible to maintain seamless connectivity in highly dynamic scenarios such as Vehicular Networks (VNs), switching from one wireless network to another by using Vertical Hand-Over techniques (VHO). In this paper, the authors present an overview of VHO techniques, along with the main algorithms, protocols and tools proposed in the literature. In addition they suggest the most appropriate VHO techniques to efficiently communicate in VN environments considering the particular characteristics of this type of networks.
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