ISSN : 1796-2056
Volume : 3    Issue : 8    Date : November 2008

Quality-Aware Cooperative Proxy Caching for Video Streaming Services
Yoshiaki Taniguchi, Naoki Wakamiya, and Masayuki Murata
Page(s): 16-25
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By applying a proxy mechanism widely used in WWW systems to video streaming systems,
low-delay and high-quality video distribution can be accomplished without imposing extra load on
the system. The video streaming system proposed in this paper consists of a video server and
multiple proxy servers. In our mechanism, proxies communicate with each other and retrieve
missing video data from an appropriate server by taking into account transfer delay and offerable
quality. In addition, the quality of cached video data is adapted appropriately at a proxy to cope with
the client-to-client heterogeneity in terms of the available bandwidth, end-system performance, and
user preferences on the perceived video quality. Through simulation experiments, it is shown that
our proposed mechanism can provide users with low-delay and highquality video streaming
services. Furthermore, to verify our mechanism, we implement a real system for MPEG-4 video
streaming services and show that our proxy caching system can provide users with a continuous
video distribution under dynamically changing network conditions.

Index Terms
video streaming service, cooperative proxy caching, quality adjustment, MPEG-4, implementation