Saving energy in IP-over-WDM networks by switching off line cards in low-demand scenarios
Please always quote using this URN:urn:nbn:de:0296-matheon-6637
- 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 realistic network topologies and node architectures 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.
Author: | Filip Idzikowski, Sebastian Orlowski, Christian Raack, Hagen Woesner, Adam Wolisz |
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URN: | urn:nbn:de:0296-matheon-6637 |
Referee: | Andreas Bley |
Document Type: | Preprint, Research Center Matheon |
Language: | English |
Date of first Publication: | 2009/10/20 |
Release Date: | 2009/12/10 |
Tag: | energy efficiency; mixed integer programming; multi-hour; multi-layer; network design; power consumption |
MSC-Classification: | 90-XX OPERATIONS RESEARCH, MATHEMATICAL PROGRAMMING / 90Bxx Operations research and management science / 90B18 Communication networks [See also 68M10, 94A05] |
90-XX OPERATIONS RESEARCH, MATHEMATICAL PROGRAMMING / 90Bxx Operations research and management science / 90B20 Traffic problems | |
90-XX OPERATIONS RESEARCH, MATHEMATICAL PROGRAMMING / 90Cxx Mathematical programming [See also 49Mxx, 65Kxx] / 90C90 Applications of mathematical programming | |
Preprint Number: | 669 |