Mobile device video caching to improve video qoe and cellular network capacity
Hasti A. Pedersen, Sujit Kumar Dey · 2014
As the video resolution, storage, and rendering capabilities of mobile devices improve, consumers tend to watch more videos on their devices. To address this increasing demand, there is a need to improve the capacity of cellular networks while also improving video Quality of Experience (QoE). Ensuring video QoE via wireless links remains a challenge, not only due to the backhaul demand, but also due to the varying wireless channel conditions caused by fading, multiuser interference, and peak traffic loads. Here, we introduce a reactive Mobile Device Caching (rMDC) framework to improve video capacity (number of concurrent video viewing sessions) and QoE in the presence of the challenges explained above. Using rMDC, a mobile device caches videos reactively as it requests them, evicts the videos least likely to be requested according to its neighbors aggregate User Preference Profile (UPP), and sharing video contents using D2D communication. We use a discrete event statistical simulation framework to study the performance of rMDC. Our simulation results demonstrate the effectiveness of rMDC, along with UPP-based caching, in achieving higher capacity and better QoE compared to no mobile device caching.