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Caching Strategies in Opportunistic Networks
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.
KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-3704-1338
2012 (English)In: 2012 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WoWMoM 2012 - Digital Proceedings, IEEE , 2012, 6263744- p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper we examine content distribution in opportunistic networks. We design and evaluate strategies by which a node fetches and shares contents on behalf of other nodes, even when the contents are not of its own interest. We propose four relaying/caching options for improving the use of network resources: relay request on demand, hop-limit, greedy relay request, and weighted relay request with allocated caching positions. We also compare our strategies with a strategy from the literature. The proposed strategies are implemented in the OMNeT++ simulator, and evaluated on mobility traces with different churn levels. The results show that the performance of opportunistic caching is strongly dependent on the level of churn in the network. However, we find a strategy that outperforms the rest in all of the explored network settings.

Place, publisher, year, edition, pages
IEEE , 2012. 6263744- p.
Keyword [en]
caching strategies, opportunistic networks, content distribution
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-100018DOI: 10.1109/WoWMoM.2012.6263744Scopus ID: 2-s2.0-84866412643ISBN: 978-146731239-4 (print)OAI: oai:DiVA.org:kth-100018DiVA: diva2:542695
Conference
13th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WoWMoM 2012; San Francisco, CA;25 June 2012 through 28 June 2012
Funder
ICT - The Next Generation
Note

QC 20120803

Available from: 2012-08-03 Created: 2012-08-02 Last updated: 2013-09-09Bibliographically approved
In thesis
1. Opportunistic Content Distribution: A System Design Approach
Open this publication in new window or tab >>Opportunistic Content Distribution: A System Design Approach
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The penetration of smart pocket-size devices that provide constant Internet connectivity, such as mobile phones, has significantly changed the way people obtain, view and share information. Content provision is not anymore a prerogative to professionals; individuals are not solely customers, but also act as content generators and distributors. This shift in social behavior requires changes in the way information is delivered to target audiences in an efficient, interest-based and location-aware manner.

This thesis explores a solution for opportunistic content distribution in a content-centric network that primarily targets content dissemination among mobile users in urban areas. The term ’opportunistic’ here refers to a concept which rejects the assumption of always-connected user devices and instead allows nodes to leverage sporadic contacts which occur when two neighbors come into direct radio communication range. Such communication mode allows data exchanges to occur in areas with little or no infrastructure; moreover, it is a potential solution for offloading the increasing traffic volumes observed by mobile operators.

The contributions of this thesis lie in three areas. We first outline a general architecture and design for opportunistic content-centric networking. We implement our proposal on the Google Android platform, and provide application scenarios which illustrate the potential of mobile peer-to-peer communication. Our tests however show that energy consumption turns out to be a major issue for opportunistic networks. Therefore, our second effort is in the area of energy-efficiency. We propose a dual-radio architecture for opportunistic communication, and evaluate it through extensive simulations on realistic human mobility traces. Our final study lies in the area of content dissemination when nodes in the network act altruistically and are willing to solicit data on behalf of other participants. We propose a number of relaying and caching strategies, and evaluate them through simulations in environments that exhibit different churn levels.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 91 p.
Series
Trita-EE, ISSN 1653-5146 ; 2012:036
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-100011 (URN)978-91-7501-451-7 (ISBN)
Presentation
2012-09-14, F3, 10:00 (English)
Opponent
Supervisors
Funder
ICT - The Next Generation
Note

QC 20120806

Available from: 2012-08-07 Created: 2012-08-02 Last updated: 2013-09-09Bibliographically approved

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Kouyoumdjieva, SylviaKarlsson, Gunnar

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