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Seminaire du LIA: Quality of experience in mobile networks (Jeudi 05/01/17, 11h30, salle S6)

Speaker: Zacharia Ye
Title: Quality of experience in mobile networks
The main task of HTTP Adaptive Streaming is to adapt video quality dynamically under variable  network conditions. This is a key feature for multimedia delivery especially when quality of  service cannot be granted network-wide and, e.g., throughput may suffer short term fluctuations.    Hence, robust bitrate adaptation schemes become crucial in order to improve video quality.  The objective, in this context, is to control the filling level of the playback buffer and  maximize the quality of the video, while avoiding unnecessary video quality variations.   We study bitrate adaptation algorithms based on Backward-Shifted Coding (BSC), a scalable  video coding scheme able to greatly improve video quality. We design bitrate adaptation  algorithms that balance  video rate smoothness and high network capacity utilization,  leveraging both on throughput-based and buffer-based adaptation mechanisms.   
Extensive simulations using synthetic and real-world video traffic traces show that the  proposed scheme  performs remarkably well even under challenging network conditions.


Jeudi, 5 Janvier, 2017 -
11:30 to 12:00