Deploying an active voice application on a three-level active network node architecture

Georg Carle, Henning Sanneck, Sebastian Zander, Long Le

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Active networks have been recently highlighted as a key enabling technology to obtain immense flexibility in terms of network deployment, configurability, and customized packet processing. However, this flexibility is often achieved at the cost of router performance. In this paper, we present a three-level node architecture that combines flexibility and high performance of network nodes. We design and implement an active network application for real-time speech transmissions on top of this three-level platform. In our application, plug-in modules are downloaded onto certain network nodes to monitor packet loss rate of voice streams and to perform application-specific packet processing when necessary. In particular, we propose to perform loss concealment algorithms for voice data streams at active network nodes to regenerate lost packets. The regenerated speech data streams are robust enough to tolerate further packet losses along the data path so that the concealment algorithms at another downstream node or at the receiver can still take effect. We call our approach reactive concealment for speech transmission to distinguish it from concealment performed at the receiver and also proactive schemes like Forward Error Correction. Our approach is bandwidth-efficient and retains the applications’ end-to-end semantics.

Original languageEnglish
Title of host publicationActive Networks - IFIP-TC6 3rd International Working Conference, IWAN 2001, Proceedings
EditorsIan W. Marshall, Scott Nettles, Naoki Wakamiya
PublisherSpringer Verlag
Number of pages19
ISBN (Print)9783540426783
StatePublished - 2001
Externally publishedYes
EventIFIP-TC6 3rd International Working Conference on Active Networks, IWAN 2001 - Philadelphia, United States
Duration: 30 Sep 20012 Oct 2001

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


ConferenceIFIP-TC6 3rd International Working Conference on Active Networks, IWAN 2001
Country/TerritoryUnited States


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