A Distributed Caching System in DTNs

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Pitkänen, Mikko
dc.contributor.author Gagliardi, Stefano
dc.date.accessioned 2012-03-06T13:44:22Z
dc.date.available 2012-03-06T13:44:22Z
dc.date.issued 2009
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/3090
dc.description.abstract Many popular services in the Internet are based on a client-server architecture. This is not an optimal model in some cases. Especially, where the server becomes difficult to reach due to link or path failures or traffic overloadings. This Master's thesis presents a design, implementation and evaluation of a distributed caching system for optimization of content retrieval in Delay-Tolerant Networks (DTNs). The presented solution proposes pushing the content closer to the requesting clients, by caching it in alternative locations on the path between client and server. In this case, the clients are able to retrieve the content with lower latency and fewer network resource consumption. The approach is motivated by the decreasing price of storage in caches. The first part of the thesis introduces the research problem on a general basis, and a literature overview is given to present the current research in the field of Web caching, proactive caching in Content Distribution Networks and caching in DTN environments. A design of the distributed caching system is then presented. Focus is to design a node that can participate in content caching. Theoretical approach is taken to motivate network topologies, routing protocols and distributions of the queries for simulations. The experimental part of the thesis discusses the results of the simulations performed to evaluate the feasibility of the proposed solution. As a result, the presented distributed caching system is shown to increase the overall retrieval performance, as well as reduce the latency for obtaining the responses. In particular, caching policies that aggressively cache items always give the best results, however, with increasing storage costs. Moreover, the distribution of the queried items has a major impact on retrieval performance. en
dc.format.extent 12 + 71
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.title A Distributed Caching System in DTNs en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Elektroniikan, tietoliikenteen ja automaation tiedekunta fi
dc.subject.keyword caching en
dc.subject.keyword Delay-Tolerant Network (DTN) en
dc.subject.keyword simulation en
dc.subject.keyword Web en
dc.subject.keyword Content Distribution en
dc.identifier.urn URN:NBN:fi:aalto-201203071321
dc.type.dcmitype text en
dc.programme.major Tietoverkkotekniikka fi
dc.programme.mcode S-38
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Ott, Jörg
dc.location P1 fi


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