QoE optimization of ON/OFF video streaming strategy in wireless networks
Mohamed Bouzian, Mustapha Bouhtou, Taoufik En-Najjary, Lucile Sassatelli, Guillaume Urvoy-Keller · 2016
Video traffic constitutes the majority of traffic in bytes that mobile and fixed line operators deliver to their customer. This type of traffic is both resource consuming and QoE sensitive. A third characteristics is that user abandon, in a lot of cases, viewing prematurely. Several strategies have been devised to account for all those dimensions. Dominant approaches are fast-caching where the server pushes traffic as fast as possible to the client and on-off strategies where the client forces the server to pause the transfer regularly. In this paper, we take a mobile operator perspective and focus on the QoE when using fast-caching or on-off strategies. We develop an analytical model which takes into account user's dynamics and allows us to derive the probability of starvation (frozen video) that the client may experience. We show that the probability of starvation of the end user is equivalent under the fast-caching and on-off strategies and we explore the trade-off between two dimensions of QoE in the on-off case: the initial startup delay and the starvation probability.