  In this paper, we analyze the performance of cooperative content caching in
vehicular ad hoc networks (VANETs). In particular, we characterize, using
analysis and simulations, the behavior of the probability of outage (i.e. not
finding a requested data chunk at a neighbor) under freeway vehicular mobility.
First, we introduce a formal definition for the probability of outage in the
context of cooperative content caching. Second, we characterize, analytically,
the outage probability under vehicular and random mobility scenarios. Next, we
verify the analytical results using simulations and compare the performance
under a number of plausible mobility scenarios. This provides key insights into
the problem and the involved trade-offs and enable us to assess the potential
opportunity offered by the, somewhat structured, vehicular mobility that can be
exploited by cooperative content caching schemes. The presented numerical
results exhibit complete agreement between the analytical and simulation
studies. Finally, we observe that vehicular mobility creates opportunities for
enhanced outage performance under practically relevant scenarios.
