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Performance of opportunistic content distribution under different levels of cooperation
KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
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2010 (English)In: 2010 European Wireless Conference, Lucca, 2010, Vol. EW 2010, 903-910 p.Conference paper (Refereed)
Abstract [en]

In this paper, we study the performance of opportunistic content distribution in a delay-tolerant network (DTN). Our primary interest is the benefit of node cooperation on the content dissemination and we investigate thoroughly how different levels of cooperation affect the content delivery delay. The evaluation is based on two complementary approaches, analytical stochastic models (Markov chains) and simulations that use real-world contact traces with high time resolution. These two independent approaches show agreeing results on the qualitative behavior of the system. Our major finding is that node collaboration - even if limited - dramatically improves performance compared to non-cooperation. In particular, we find that limiting the number of times a node shares a content item gives only a slightly worse performance than under unlimited cooperation. Besides, we find that a critical number of nodes is necessary to disseminate content efficiently. Eventually, based on the analytic model we also find that the details of the mobility show little effect on the delivery time when the nodes cooperate.

Place, publisher, year, edition, pages
Lucca, 2010. Vol. EW 2010, 903-910 p.
Keyword [en]
Analytic models, Content delivery, Content dissemination, Content distribution, Critical numbers, Delay Tolerant Networks, Delivery time, High-time resolution, Markov Chain, Node cooperation, Qualitative behavior, Real-world, Computer simulation, Markov processes, Stochastic models
National Category
Computer Science
URN: urn:nbn:se:kth:diva-35947DOI: 10.1109/EW.2010.5483523ScopusID: 2-s2.0-77954454247ISBN: 9781424459995OAI: diva2:429969
2010 European Wireless Conference, EW 2010; Lucca
QC 20110706Available from: 2011-07-06 Created: 2011-07-06 Last updated: 2013-09-09Bibliographically approved

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Helgason, Ólafur RagnarKarlsson, Gunnar
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Communication NetworksACCESS Linnaeus Centre
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