Content dissemination over vehicular networks is a critical challenge due to its high intermittent connectivity. However,\ncontent cache and retrieval by exploiting the information-centric networking (ICN) paradigm did not get much\nattention. In this paper, in order to improve the efficiency of content retrieval, we propose a novel popularity-aware\ncontent caching and retrieving strategy in VANETs named P-CCR, which innovatively considers the ICN perspective into\nvehicles mobility and vehicular wireless communication in highway scenarios. At the same time, it supports to\nindependently switch the retrieval modes between vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I)\naccording to the popularity of contents. Most notably, an actively caching mechanism is proposed in P-CCR,\nwhich can be triggered to inform surrounding volunteer vehicles to cache contents requested in a short time.\nExtensive simulations highlight that P-CCR significantly reduces RTT value and the amount of interest packets, which\ncan lighten network loads and avoid wasting resources.
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