Overview:
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Recent years have seen a tremendous growth in the volume of video
traffic in mobile settings. In this paper, we present the design of a
mobile video-centric proxy cache, named iProxy, that offers improved
performance in terms of both hit rates and streaming quality.
Our thesis in designing iProxy is that we need to elevate the
traditional view of caching from “data” to “information” in order
to optimally meet the stringent requirements of video streaming in
mobile settings. iProxy relies on recent advances on informationbound
references (IBRs) to collapse multiple related cache entries
into a single one, improving hitrate while lowering storage costs.
iProxy incorporates a novel dynamic linear rate adaptation scheme
to ensure high stream quality in face of channel diversity and device
heterogeneity. Our evaluation of iProxy using realistic traffic
traces shows that it can improve hitrate, but we need to use novel
information-aware replacement policies for optimal performance.
We show that our linear encoder can adapt well to changes in bandwidth,
and yield better bit rates, lower buffering and lower start up
delays than state-of-the-art schemes.
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