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Multicast Routing of Hierarchical DataThe issue of multicast of broadband, real-time data in a heterogeneous environment, in which the data recipients differ in their reception abilities, is considered. Traditional multicast schemes, which are designed to deliver all the source data to all recipients, offer limited performance in such an environment, since they must either force the source to overcompress its signal or restrict the destination population to those who can receive the full signal. We present an approach for resolving this issue by combining hierarchical source coding techniques, which allow recipients to trade off reception bandwidth for signal quality, and sophisticated routing algorithms that deliver to each destination the maximum possible signal quality. The field of hierarchical coding is briefly surveyed and new multicast routing algorithms are presented. The algorithms are compared in terms of network utilization efficiency, lengths of paths, and the required mechanisms for forwarding packets on the resulting paths.
Document ID
19990017646
Acquisition Source
Ames Research Center
Document Type
Contractor Report (CR)
Authors
Shacham, Nachum (SRI International Corp. Menlo Park, CA United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Subject Category
Documentation And Information Science
Report/Patent Number
NASA-CR-205795
ITAD-8600-CP-91-40
NAS 1.26:205795
Funding Number(s)
CONTRACT_GRANT: NAS2-13181
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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