  In this paper, we propose a novel policy for device caching that facilitates
popular content exchange through high-rate device-to-device (D2D)
millimeter-wave (mmWave) communication. The D2D-aware caching (DAC) policy
splits the cacheable content into two content groups and distributes it
randomly to the user equipment devices (UEs), with the goal to enable D2D
connections. By exploiting the high bandwidth availability and the
directionality of mmWaves, we ensure high rates for the D2D transmissions,
while mitigating the co-channel interference that limits the throughput gains
of D2D communication in the sub-6 GHz bands. Furthermore, based on a
stochastic-geometry modeling of the network topology, we analytically derive
the offloading gain that is achieved by the proposed policy and the
distribution of the content retrieval delay considering both half- and
full-duplex mode for the D2D communication. The accuracy of the proposed
analytical framework is validated through Monte-Carlo simulations. In addition,
for a wide range of a content popularity indicator the results show that the
proposed policy achieves higher offloading and lower content-retrieval delays
than existing state-of-the-art approaches.
