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Traffic re-optimization strategies for dynamically provisioned WDM networks
KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101). (NEGONET)
Warsaw University of Technology.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101). (NEGONET)ORCID iD: 0000-0002-5636-9910
KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Photonics (Closed 20120101). (NEGONET)ORCID iD: 0000-0001-6704-6554
2011 (English)In: ONDM 2011 - 15th Conference on Optical Network Design and Modeling, Bologna, 2011Conference paper, Published paper (Refereed)
Abstract [en]

In Wavelength Division Multiplexed (WDM) networks with dynamic lightpath provisioning, connection requests are served without any prior knowledge of their arrival and departure times. As time passes, network resources may become fragmented because of the network dynamism. Under these circumstances it is highly beneficial to re-optimize (i.e., de-fragment) the existing lightpath configuration at some specific time instances to improve the network resource utilization and reduce the risk that future connection requests will be blocked. Assuming that this de-fragmentation process occurs during a re-optimization phase, this paper presents a set of strategies which govern the time instances when this re-optimization phase should be triggered as well as a set of strategies to decide which of the currently active lightpaths should be optimized at any given re-optimization phase. These strategies are referred to as when-to-re-optimize (when-t-r) and what-to-re-optimize (what-t-r) strategies, respectively. During the evaluation process particular attention is devoted to study the impact that when-t-r and what-t-r strategies have on the traffic disruption metrics (i.e., number of total disrupted connections, disruption time, reconfiguration time) inherent with the re-optimization process. Based on the evaluation results, it can be concluded that the choice of an optimal "when" and an optimal "what" to re-optimize strategy is dependent upon the performance objective (e.g. lower blocking probability or network disruption) in a given network scenario.

Place, publisher, year, edition, pages
Bologna, 2011.
Series
15th Conference on Optical Network Design and Modeling, ONDM 2011
Keyword [en]
De-fragmentation, Departure time, Disruption time, Evaluation process, Evaluation results, Light path, Lightpath provisioning, Network resource, Network resource utilization, Network scenario, OR-networks, Performance objective, Prior knowledge, Reconfiguration time, Specific time, Time instances, Traffic disruption, Wavelength division multiplexed, WDM networks, Blocking probability, Fiber optic networks, Wavelength division multiplexing, Optimization
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-52671Scopus ID: 2-s2.0-79956121844ISBN: 9783901882425 (print)OAI: oai:DiVA.org:kth-52671DiVA: diva2:467389
Conference
Optical Network Design and Modeling (ONDM)
Funder
ICT - The Next Generation
Note

QC 20111219

Available from: 2011-12-19 Created: 2011-12-19 Last updated: 2014-09-16Bibliographically approved

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Monti, PaoloWosinska, Lena

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