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2006 IEEE International Performance Computing and Communications Conference (2006)
Phoenix, AZ, USA
Apr. 10, 2006 to Apr. 12, 2006
ISBN: 1-4244-0198-4
pp: 90
N. Blundell , Comput. Dept., Lancaster Univ., UK
N. Egi , Comput. Dept., Lancaster Univ., UK
L. Mathy , Comput. Dept., Lancaster Univ., UK
In this paper, we present a thorough and realistic analysis of voice (i.e. audio conferencing) over application-level multicast (ALM). Through flexibility and ease-of-deployment, ALM is a compelling alternative group-communication technique to IP multicast-which has yet to see wide-scale deployment in the Internet. However, proposed ALM techniques suffer from inherent latency inefficiencies, which we show, through realistic simulation and exploration of perceived quality in multi-party conversation, to be greatly problematic for the realisation of truly-scalable audio-conferencing systems over ALM. By incorporating talkspurt data from a large and detailed corpus of multi-party conversation, and through using network-simulation techniques based on actual Internet latency measurements, we develop our previous work on the application-level network audio-conferencing (ALNAC) routing protocol into a thorough analysis of the problem, leading to a novel model for assessing the perceptual quality of multi-party conversation and to novel techniques for speaker prediction. We show that through adaptation to conversational patterns, the ALNAC protocol can achieve perceptual quality for large-scale audio conferencing that, with little cost to each end-system node, is comparable to IP multicast.
speaker prediction, voice over application-level multicast, ALM, group-communication technique, IP multicast, Internet, multiparty conversation, network-simulation technique, application-level network audio-conferencing, ALNAC, routing protocol, perceptual quality

N. Blundell, N. Egi and L. Mathy, "Voice over application-level multicast," 2006 IEEE International Performance Computing and Communications Conference(PCC), Phoenix, AZ, USA, 2006, pp. 90.
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