NDLI: Optimal Layered Multicast with Network Coding: Mathematical Model and Empirical Studies

Content Provider	IEEE Xplore Digital Library
Author	Gopinathan, A. Zongpeng Li
Copyright Year	2008
Description	Author affiliation: Univ. of Calgary, Calgary, AB (Gopinathan, A.; Zongpeng Li)
Abstract	Recent advances in network coding research dramatically changed the underlying structure of optimal multicast routing algorithms and made them efficiently computable. While most such algorithm design assume a single file/layer being multicast, layered coding introduces new challenges into the paradigm due to its cumulative decoding nature. Layered coding is designed to handle heterogeneity in receiver capacities, and a node may decode layer k only if it successfully receives all layers in 1..k. We show that recently proposed optimization models for layered multicast do not correctly address this challenge. We argue that in order to achieve the absolute maximum throughput (or minimum cost), it is necessary to decouple application layer throughput from network layer throughput. In particular, a node should be able to receive a non-consecutive layer or a partial layer even if it cannot decode and utilize it (e.g., for playback in media streaming applications). The rationale is that nodes at critical network locations need to receive data just for helping other peers. We present a mathematical programming model that addresses the above challenges and achieves the absolute optimal performance. Simulation results show considerable throughput gain (cost reduction) compared with previous models, in a broad range of network scenarios. We further generalize our model for studying the optimal progression of layer sizes. We show that such optimization is non-convex, and apply a Simulated Annealing algorithm to solve it, with flexible trade-off between solution quality and running time.
Starting Page	1
Ending Page	10
File Size	5180664
Page Count	10
File Format	PDF
ISBN	9781424428175
ISSN	15267539
DOI	10.1109/MASCOT.2008.4770563
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Network coding Mathematical model Peer to peer computing Throughput Decoding Multicast algorithms Costs Streaming media Routing Computer networks
Content Type	Text
Resource Type	Article

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