Gastvorträge 2014

Vortragender Ali Gouta
Titel Caching and Prefetching for Efficient Video Services over the Internet
Zeit Mittwoch, 09.04.2014, 14:00 Uhr
Ort S3|19, Raum 5+6, MAKI-Cocoon-Räume
Rundeturmstr. 12, 64283 Darmstadt
Cellular networks have witnessed the emergence of the HTTP Adaptive Streaming (HAS) as a new video delivery method.
In HAS, several qualities of the same videos are made available in the network so that clients can chose the best quality that fits their bandwidth capacity. This has particular implications on caching strategies with respect to the viewing patterns and the switching behavior between video qualities. We present analysis of a real HAS dataset collected in France and provided by the country's largest mobile phone operator. More precisely, we present analysis of the viewing patterns of HAS contents and the distribution of the encoding bitrates requested by mobile clients. Then, we present and evaluate new caching mechanisms, namely WA-LRU and CF-Dash, tailored for HAS contents. At the end, we give insights and guidelines about prefetching videos on mobile devices.
Ali Gouta is R&D Computer Science Engineer at Orange Labs, France.