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Impact of Duty Cycling on Opportunistic Communication
KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-9176-3454
KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-3704-1338
2016 (English)In: IEEE Transactions on Mobile Computing, ISSN 1536-1233, E-ISSN 1558-0660, Vol. 15, no 7, 1686-1698 p.Article in journal (Refereed) Epub ahead of print
Abstract [en]

A major challenge in mobile wireless devices for opportunistic networks is to decrease the energy consumption. The decrease should not come at a cost of reduced application throughput (i.e. goodput). This work evaluates the potential performance gains for mobile nodes that adopt duty cycling in an opportunistic context. The paper presents an analytical framework for evaluating goodput and energy consumption of nodes based on a probabilistic estimation of effective contact durations, and it validates this framework on a mobility scenario. The study shows that both goodput and energy consumption depend strongly on the distribution of listening durations, and that goodput is independent of the contact rate among nodes. This work also includes extensive trace-driven simulations and demonstrates that duty cycling considerably improves the performance of opportunistic networks by decreasing the energy consumption without significantly affecting the goodput.

Place, publisher, year, edition, pages
2016. Vol. 15, no 7, 1686-1698 p.
Keyword [en]
energy savings, energy-goodput trade-off, opportunistic communication, duty-cycling, wireless systems
National Category
URN: urn:nbn:se:kth:diva-175758DOI: 10.1109/TMC.2015.2478470ISI: 000378499000008ScopusID: 2-s2.0-84976599198OAI: diva2:862190

QCR 20160608

Available from: 2015-10-20 Created: 2015-10-20 Last updated: 2016-07-26Bibliographically approved
In thesis
1. System Design for Opportunistic Networks
Open this publication in new window or tab >>System Design for Opportunistic Networks
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Device-to-device communication has been suggested as a complement to traditional cellular networks as a means of offloading cellular traffic. In this thesis we explore a solution for device-to-device communication based on opportunistic content distribution in a content-centric network. Communication opportunities arise as mobile nodes roam around in an area and occasionally enter in direct communication range with one another. We consider a node to be a pedestrian equipped with a mobile device and explore the properties of opportunistic communication in the context of content dissemination in urban areas.

The contributions of this thesis lie in three areas. We first study human mobility as one of the main enablers of opportunistic communication. We introduce traces collected from a realistic pedestrian mobility simulator and demonstrate that the performance of opportunistic networks is not very sensitive to the accurate estimation of the probability distributions of mobility parameters. However, capturing the space in which mobility occurs may be of high importance. Secondly, we design and implement a middleware for opportunistic content-centric networking, and we evaluate it via a small-scale testbed, as well as through extensive simulations. We conclude that energy-saving mechanisms should be part of the middleware design, while caching should be considered only as an add-on feature. Thirdly, we present and evaluate three different energy-saving mechanisms in the context of opportunistic networking: a dual-radio architecture, an asynchronous duty-cycling scheme, and an energy-aware algorithm which takes into account node selfishness. We evaluate our proposals analytically and via simulations. We demonstrate that when a critical mass of participants is available, the performance of the opportunistic network is comparable to downloading contents directly via the cellular network in terms of energy consumption while offloading large traffic volumes from the operator.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. vi, 59 p.
TRITA-EE, ISSN 1653-5146 ; 2015:104
opportunistic communication, system design, mobility, energy-saving mechanisms, device-to-device communication, mobile data offloading
National Category
Research subject
Electrical Engineering
urn:nbn:se:kth:diva-176479 (URN)978-91-7595-778-4 (ISBN)
Public defence
2015-12-11, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 09:00 (English)

QC 20151120

Available from: 2015-11-20 Created: 2015-11-05 Last updated: 2015-12-11Bibliographically approved

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Kouyoumdjieva, Sylvia T.Karlsson, Gunnar
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