Cooperative Caching and Video Characteristics in D2D Edge Networks

Device-to-device (D2D) transmissions in wireless edge networks are promising for optimizing system-wide energy consumption and improving system service capacity. Cooperative content caching similarly serves efficiency goals for data-intensive applications in edge networks. In this work, we propose two cooperative cache replacement algorithms in D2D networks to support these techniques: i) distance-based ii) priority-class based. Video content dissemination in an edge network is our main use-case. In such content traffic, video characteristics have a significant impact on the system behavior. Therefore, we also investigate the effect of content scene change dynamics in our system. Distance based cooperation outperforms $LRU$ , $MIN$ - $ACC$ and $SXO$ in terms of goodput while priority-class based approach consumes less energy than $MIN$ - $ACC$ with almost the same consumption as $LRU$ , especially under fast-changing scene regime. Besides, it is energy-wise slightly more rewarding than $SXO$ for the fastest-changing scene case.