Smart Caching for QoS-Guaranteed Device-to-Device Content Delivery

Caching at user equipment （UE）provides a feasible way for device-to-device（D2D） content delivery among proximal userswithout deploying additional infrastructures.To support D2D content delivery for mobiletraffics with quality-of-service （QoS） require-ments, smart caching problem is essential tobe solved especially when there is no priorknowledge on demands of proximal users. Inthis paper, impacts of QoS requirements andlimited caching capacity on UE caching areanalyzed, respectively, based on which a cach-ing scheme is proposed. With the proposedcaching scheme, UE can determine whethercaching a content or not intelligently to guar-antee a content request via D2D communica-tions in the network. Simulation results arepresented which verify the analyzed influenc-ing factors on D2D caching and the proposedQoS-provisioning caching scheme.