Video multicast using layered FEC and scalable compression
Wai-Tian Tan; Zakhor, A.
Circuits and Systems for Video Technology, IEEE Transactions on
Volume 11, Issue 3, Mar 2001 Page(s):373 - 386
Digital Object Identifier 10.1109/76.911162
Summary:The use of scalable video with layered multicast has been shown to
be an effective method to achieve rate control in heterogeneous
networks. We propose the use of layered forward error correction (FEC)
as an error-control mechanism in a layered multicast framework. By
organizing FEC into multiple layers, receivers can obtain different
levels of protection commensurate with their respective channel
conditions. Efficient network utilization is achieved as FEC streams are
multicast, and only to receivers that need them. Furthermore, FEC is
used without overall rate expansion by selectively dropping data layers
to make room for FEC layers. Effects of bursty losses are amortized by
staggering the FEC streams in time, giving rise to a tradeoff between
delay and quality. For rate control at the receivers, we propose an
equation-based approach that computes network usage as a function of
measured network characteristics. We show that equation-based rate
control achieves more fair bandwidth sharing amongst competing sessions
as compared to existing multicast rate control schemes such as RLM and
RLC. Fairness is achieved since competing sessions sharing a path will
measure similar network characteristics. Simulations and actual MBONE
experiments are performed using error-resilient, scalable video
compression. We find that video quality is significantly improved at the
same communication rate when layered FEC is used
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