NDLI: Nullspace-based stopping conditions for network-coded transmissions in DTNs

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Nullspace-based stopping conditions for network-coded transmissions in DTNs

Content Provider	ACM Digital Library
Author	Walker, Brenton Hennessy, Angela Gladd, Alex
Abstract	In a challenged network environment, where end-to-end connectivity may be a rare occurrence, delay-tolerant routing protocols must strike a balance between the increased robustness and reliability that comes with message replication and the resulting high bandwidth and storage overhead. Network coded routing, in which a node combines messages from different sources, has been shown to increase reliability in the presence of link failures with small additional overhead. A drawback of network coded routing is the lack of a natural stopping condition to control the dissemination of data. We describe an enhanced coding router that uses the mathematical structure of the orthogonal complement, or nullspace, as an improved stopping condition to eliminate redundant transmissions, and an additional technique to balance multiple coded data flows. These changes are incorporated into the DTN2 Reference Implementation and evaluated in two types of experiments. In a simple data-mule scenario, our EBR router comes very close to perfect efficiency. In a more complicated scenario with segmented communities and occasional nodes moving between them, our solutions show a drastic improvement in delivery rates.
Starting Page	51
Ending Page	56
Page Count	6
File Format	PDF
ISBN	9781450312844
DOI	10.1145/2348616.2348627
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-08-22
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Network coding Delay-tolerant networks Bundle protocol
Content Type	Text
Resource Type	Article

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