Smart Base Station-Assisted Partial-Flow Device-to-Device Offloading System for Video Streaming Services

摘要

This paper presents a smart base station-assisted partial-flow device-to-device offloading system that provides seamless video streaming services to clients by effectively offloading parts of the video traffic to D2D networks in order to alleviate the cellular network traffic load. In the proposed system, the main functionalities of the content centric networking (CCN) technology are deployed for efficient and fast cached content management at the base stations and in the devices. First, a logical overlay Chord-like network is constructed among the smart base stations for effectively handling significant numbers of the distributed contents. Then, content management protocols over the Chord-like network are implemented for rapidly finding the D2D server that contains the cached content requested by the D2D client. A two-stage PID-based LTE traffic controller is proposed to determine the amount of traffic to be offloaded to the D2D network among the cellular operator, the D2D servers, and the D2D clients. The proposed system is fully implemented using a CCNx open source and C/C++. Experimental results are provided to demonstrate the performance improvement of the proposed system.