SmarterPhones: Anticipatory download scheduling for wireless video streaming

Martin Draxler, Johannes Blobel, Philipp Dreimann, Stefan Valentin, Holger Karl
2015 2015 International Conference and Workshops on Networked Systems (NetSys)  
Video streaming is in high demand by mobile users, as recent studies indicate. In cellular networks, however, the unreliable wireless channel leads to two major problems. Poor channel states degrade video quality and interrupt the playback when a user cannot sufficiently fill its local playout buffer: buffer underruns occur. In contrast to that, good channel conditions cause common greedy buffering schemes to pile up very long buffers. Such over-buffering wastes expensive wireless channel
more » ... ty. To keep buffering in balance, we employ a novel approach. Assuming that we can predict data rates, we plan the quality and download time of the video segments ahead. This anticipatory scheduling avoids buffer underruns by downloading a large number of segments before a channel outage occurs, without wasting wireless capacity by excessive buffering. We formalize this approach as an optimization problem and derive practical heuristics for segmented video streaming protocols (e.g., HLS or MPEG DASH). Simulation results and testbed measurements show that our solution essentially eliminates playback interruptions without significantly decreasing video quality.
doi:10.1109/netsys.2015.7089073 dblp:conf/kivs/DraxlerBDVK15 fatcat:u3gxm7ysxzhedgrh7fadxhzri4