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  <doc>
    <id>1169</id>
    <completedYear/>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>reportzib</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation>Zuse Institute Berlin</creatingCorporation>
    <contributingCorporation>TKN, TU Berlin, Germany; atesio GmbH, Berlin, Germany</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2010-05-12</completedDate>
    <publishedDate>2010-05-12</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Dynamic routing at different layers in IP-over-WDM networks -- Maximizing energy savings</title>
    <abstract language="eng">We estimate potential energy savings in IP-over-WDM networks achieved by switching off router line cards in low-demand hours. We compare three approaches to react on dynamics in the IP traffic over time, FUFL, DUFL and DUDL. They provide different levels of freedom in adjusting the routing of lightpaths in the WDM layer and the routing of demands in the IP layer. Using MILP models based on three realistic network topologies as well as realistic demands, power, and cost values, we show that already a simple monitoring of the lightpath utilization in order to deactivate empty line cards (FUFL) brings substantial benefits. The most significant savings, however, are achieved by rerouting traffic in the IP layer (DUFL), which allows emptying and deactivating lightpaths together with the corresponding line cards. A sophisticated reoptimization of the virtual topologies and the routing in the optical domain for every demand scenario (DUDL) yields nearly no additional profits in the considered networks. These results are independent of the ratio between the demand and capacity granularities, the time scale and the network topology, and show little dependency on the demand structure.</abstract>
    <identifier type="serial">10-07</identifier>
    <identifier type="issn">1438-0064</identifier>
    <identifier type="opus3-id">1230</identifier>
    <identifier type="urn">urn:nbn:de:0297-zib-11692</identifier>
    <author>Filip Idzikowski</author>
    <submitter>unknown unknown</submitter>
    <author>Sebastian Orlowski</author>
    <author>Christian Raack</author>
    <author>Hagen Woesner</author>
    <author>Adam Wolisz</author>
    <series>
      <title>ZIB-Report</title>
      <number>10-07</number>
    </series>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>network design</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>energy efficiency</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>power consumption</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>multi-layer</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>multi-hour</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>multi-period</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="msc" number="90B18">Communication networks [See also 68M10, 94A05]</collection>
    <collection role="msc" number="90C11">Mixed integer programming</collection>
    <collection role="msc" number="90C35">Programming involving graphs or networks [See also 90C27]</collection>
    <collection role="institutes" number="optimization">Mathematical Optimization</collection>
    <collection role="projects" number="MATHEON-B3">MATHEON-B3</collection>
    <collection role="institutes" number="aopt">Applied Optimization</collection>
    <file>https://opus4.kobv.de/opus4-zib/files/1169/ZR_10_07.pdf</file>
    <file>https://opus4.kobv.de/opus4-zib/files/1169/ZR_10_07.ps</file>
  </doc>
  <doc>
    <id>3299</id>
    <completedYear>2010</completedYear>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>42</pageFirst>
    <pageLast>47</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>IEEE Press</publisherName>
    <publisherPlace>Piscataway, NJ, USA</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Saving energy in IP-over-WDM networks by switching off line cards in low-demand scenarios</title>
    <parentTitle language="eng">Proceedings of the 14th conference on Optical network design and modeling</parentTitle>
    <identifier type="url">http://portal.acm.org/citation.cfm?id=1834075.1834085</identifier>
    <enrichment key="Series">ONDM’10</enrichment>
    <enrichment key="PeerReviewed">yes</enrichment>
    <author>Filip Idzikowski</author>
    <author>Sebastian Orlowski</author>
    <author>Christian Raack</author>
    <author>Hagen Woesner</author>
    <author>Adam Wolisz</author>
    <collection role="institutes" number="optimization">Mathematical Optimization</collection>
    <collection role="projects" number="MATHEON-B3">MATHEON-B3</collection>
    <collection role="institutes" number="aopt">Applied Optimization</collection>
  </doc>
  <doc>
    <id>3297</id>
    <completedYear>2011</completedYear>
    <publishedYear>2011</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Dynamic routing at different layers in IP-over-WDM networks – Maximizing energy savings</title>
    <parentTitle language="eng">Optical Switching and Networking, Special Issue on Green Communications</parentTitle>
    <identifier type="url">http://opus.kobv.de/zib/volltexte/2010/1230/</identifier>
    <enrichment key="PreprintUrn">urn:nbn:de:0297-zib-11692</enrichment>
    <enrichment key="PeerReviewed">yes</enrichment>
    <author>Filip Idzikowski</author>
    <author>Sebastian Orlowski</author>
    <author>Christian Raack</author>
    <author>Hagen Woesner</author>
    <author>Adam Wolisz</author>
    <collection role="institutes" number="optimization">Mathematical Optimization</collection>
    <collection role="projects" number="MATHEON-B3">MATHEON-B3</collection>
    <collection role="institutes" number="aopt">Applied Optimization</collection>
  </doc>
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