Topics: Voice and video; Adaptive applications; Design and QoS/QoE evaluation of networked apps
Authors: Jan Willem Kleinrouweler (Centrum Wiskunde & Informatica, The Netherlands); Sergio Cabrero (CWI, The Netherlands); Rob van der Mei (Centrum voor Wiskunde en Informatica, The Netherlands); Pablo Cesar (CWI, The Netherlands)
Jan Willem Kleinrouweler is PhD student at CWI, the national research institute for
mathematics and computer science in the Netherlands, where he works under supervision of
dr. Pablo Cesar and prof. dr. Rob van der Mei. His research focusses on dynamic
optimization of HTTP video in wireless networks and networks with limited bandwidth.
Abstract: In this paper, we present a model for evaluating bandwidth sharing policies, that can be applied to networks that handle both video streaming traffic, as well as other traffic. Video streaming is a demanding network application. In crowded networks, resources need to be properly divided in order not to diminish the streaming experience. However, in network deployments with a large number of users, the streaming performance cannot be obtained straightforwardly from a sharing policy. Therefore, we propose a Markov model that is compatible with Dynamic Adaptive Streaming over HTTP (DASH), the major technology for video streaming over the Internet. If DASH is combined with in-network resource management, its performance can be significantly improved. Nevertheless, resource sharing policies need to be configured. This requires evaluating of many different configurations. Real deployments or network simulations demand many system resources and time. In contrast, our model can quickly evaluate many configurations, and for each configuration output the expected video bitrate and number of changes in video bitrate. These two parameters play an important role in the Quality of Experience of the viewer. In this paper, we demonstrate how our model an be used to analyze and optimize resource sharing policies. As such, our model is a useful tool for network administrators and allows them to better provision and configure their networks.