Video Placements and Dynamic Streaming Services in Wireless Caching Networks

This paper provides summarizes the state-of-the-art techniques for dynamic video streaming services in wireless caching networks. As data traffic of video streaming services is increasingly exploding, wireless caching networks have become promising to reduce the delivery latency as well as to save the high-cost backhaul consumption. This paper introduces the techniques for dynamic video streaming in wireless caching networks by classifying into 1) caching and 2) delivery parts. Especially, dynamic streaming allows the user to play the video while receiving remaining chunks sequentially, and to adaptively select the quality of each chunk. Video files are encoded into multiple bitrates resulting in different quality measures, and in general, the streaming users prefer to avoid the playback delay at the expense of quality measures of videos. The time-varying popularity profile of contents and distributed control of content delivery especially for device-to-device (D2D)-assisted caching networks are also critical issues. This paper investigates the key techniques appropriate for the distinct characteristics of dynamic video streaming in wireless caching networks, and presents the valuable but challenging future research directions.