Video Delivery Architecture for Hierarchical HetNet: HH-D2D Caching

Abstract

ABSTRACTOver the last few years, smart devices and mobile devices drive the wide growth in mobile data communications. This increase is a major challenge for mobile network operators (MNOs). The MNOs are forced to operate with their maximum capacity limits and this growth needs mobile data offloading to accomplish the capacity demands. The mobile data offloading through device-to-device (D2D) communication can help to reduce the network congestion at low operational and capital expenses. The data offloading through D2D attracts the mobile users to participate, by paying them proper incentives in returns of their services. The offloading requires mutual agreement and benefits both the parties, MNOs and mobile users. In this paper, we categorize the smart devices (SDs) on the basis of their storage and methoding capabilities. Furthermore, we create the hierarchy of SDs to utilize the available resources efficiently with minimum cost and higher benefits. We present a main node–friend node (MNFN) selection and matching mechanism, which efficiently selects and utilizes available high-end SDs (HSDs) on the basis of available resources for offloading purpose. It also decides the optimal pricing policy for the selected SDs. The efficiency of MNFN has been realized in terms of bandwidth and storage demand. Subsequently, we implement caching in MNs, and FNs with the help of our novel hierarchical heterogeneous D2D (HH-D2D) caching-based video dissemination architecture to solve the bit rate issues in the mobile network. The particular focus of our work is on video data, due to high demands. Simulation results show that FN caching increases bit rate up to ∼26 times, while MNFN caching improves bit rate up to ∼40 times.