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dc.contributor.advisorKaraşan, Ezhan
dc.contributor.authorÖztürk, Onur
dc.date.accessioned2016-01-08T18:03:50Z
dc.date.available2016-01-08T18:03:50Z
dc.date.issued2008
dc.identifier.urihttp://hdl.handle.net/11693/14649
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and Sciences of Bilkent University, 2008.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2008.en_US
dc.descriptionIncludes bibliographical references leaves 70-76.en_US
dc.description.abstractOptical burst switching (OBS) is proposed as the switching paradigm of nextgeneration optical Internet. In OBS, IP packets from access networks are assembled into longer units of bursts allowing a lower level of switching granularity offered by the readily available optical technology. Although OBS was asynchronous in the earlier work, slotted OBS (SOBS) has recently caught the attention of the researchers due to performance gains achievable with synchronous infrastructures. In this thesis, we study the blocking probabilities in a slotted optical burst switching node fed with independent and identically distributed Poisson burst traffic and for which the burst sizes are a fixed integer multiple of the slot length. We develop a discrete time Markov chain based framework to obtain the blocking probabilities in systems with and without QoS differentiation. In particular, we study priority scheduling and offset-based QoS differentiation mechanisms for SOBS networks. The latter problem suffers from the curse of dimensionality, which we address by a discrete phase type approximation for the discrete Poisson distribution. The results obtained by using the moment-matched phase type distribution are shown to provide a very accurate approximation for the blocking probabilities. Finally, we extend our framework to analyze the hybrid priority scheduling with unity-offset based differentiation scheme which proves to outperform the others in the degree of class isolation. We show that increasing burst length has an adverse affect on the attained QoS level. We also give a quantitative discussion of the trade off between the burst blocking probability and the slot granularity. As the slot duration is decreased, burst transmissions can be initiated in an earlier time decreasing the end-to-end delay in an SOBS network with a penalty of increased burst loss probability. We evaluate the burst blocking probabilities of a classless and two-class SOBS nodes as a function of the slot length, number of wavelengths and traffic load.en_US
dc.description.statementofresponsibilityÖztürk, Onuren_US
dc.format.extentxiii, 76 leaves, graphsen_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectOptical Burst Switching (OBS)en_US
dc.subjectQuality of Service (QoS)en_US
dc.subjectSlotted Optical Burst Switching (SOBS)en_US
dc.subject.lccTK5105.3 .O98 2008en_US
dc.subject.lcshPacket switching (Data transmission)en_US
dc.subject.lcshWavelength division multiplexing.en_US
dc.subject.lcshOptical communications--Quality control.en_US
dc.titleQuality of service analysis for slotted optical burst switching networksen_US
dc.typeThesisen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.publisherBilkent Universityen_US
dc.description.degreeM.S.en_US


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