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Layered Video Multicast with Retransmissions (LVMR): Evaluation of Hierarchical Rate Control 1

Summary: Layered Video Multicast with Retransmissions (LVMR): Evaluation of
Hierarchical Rate Control 1
Xue Li \Lambda , Sanjoy Paul y , and Mostafa Ammar \Lambda
\Lambda: College of Computing, Georgia Tech, Atlanta,GA 30332, flixue, ammarg@cc.gatech.edu
y: Bell Laboratories, Holmdel, NJ 07733, sanjoy@dnrc.bell­labs.com
Layered Video Multicast with Retransmissions (LVMR) is a system for distributing video
using layered coding over the Internet. The two key contributions of the system are: (1)
improving the quality of reception within each layer by retransmitting lost packets given an
upper bound on recovery time and applying an adaptive playback point scheme to help achieve
more successful retransmission, and (2) adapting to network congestion and heterogeneity using
hierarchical rate control mechanism. This paper concentrates on the rate control aspects of
LVMR. In contrast to the existing sender­based and receiver­based rate control in which the
entire information about network congestion is either available at the sender (in sender­based
approach) or replicated at the receivers (in receiver­based approach), the hierarchical rate control
mechanism distributes the information between the sender, receivers, and some agents in the
network in such a way that each entity maintains only the information relevant to itself. In
addition to that, the hierarchical approach enables intelligent decisions to be made in terms
of conducting concurrent experiments and choosing one of several possible experiments at any
instant of time based on minimal state information at the agents in the network. Protocol


Source: Ammar, Mostafa - College of Computing, Georgia Institute of Technology


Collections: Computer Technologies and Information Sciences