Resource sharing and segment allocation optimized video streaming over multi-path in dense D2D 5G networks

The rapid increase in mobile users (MUs) and variousvideo applications and services (VASs) poses a set ofchallenges to 5G networks. Although device-to-device (D2D) communications and resource reusetechniques can improve the streaming performanceof VASs, they have not utilized the fact that there aremany MUs with available sharing downlink resources,namely cellular users (CUs), and many videos cached in dense MUs to establish an efficient videostreaming session. In this paper, we propose adownlink resource sharing and segment allocation(RSA) optimization problem and solve it for highvideo streaming performance over multi-hop multi-path (MHMP) in dense D2D 5G networks. Particularly,the RSA provides a maximum capacity for the CUsthat share their downlink resources with the D2Dhops in each path by finding the optimal downlinkresource sharing-receiving pairs between the CUsand the D2D hops. Then, the segments of a videocached in different D2D helpers (DHs) are sent to theD2D requester (DR) over the MHMP. By finding whichsegments are allocated to which paths for sending,the reconstructed distortion of the received segmentsat the DR is minimized for high playback quality.Simulation results are shown to investigate thebenefits of the proposed solution compared to otherschemes without RSA.