Vehicular ad hoc networks (VANETs) have been quite a hot research area in the last few years. Due to their unique characteristics\nsuch as high dynamic topology and predictable mobility, VANETs attract so much attention of both academia and industry. In\nthis paper, we provide an overview of the main aspects of VANETs from a research perspective. This paper starts with the basic\narchitecture of networks, then discusses three popular research issues and general research methods, and ends up with the analysis\non challenges and future trends of VANETs.
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