Some principles for designing a wide-area WDM optical network
IEEE/ACM Transactions on Networking (TON)
Optical WDM Networks (Optical Networks)
Optical WDM Networks (Optical Networks)
Power efficient traffic grooming in optical WDM networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Traffic grooming: a changing role in green optical networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Saving energy in IP-over-WDM networks by switching off line cards in low-demand scenarios
ONDM'10 Proceedings of the 14th conference on Optical network design and modeling
Energy Efficiency in Telecom Optical Networks
IEEE Communications Surveys & Tutorials
Energy efficient Traffic-Aware design of on-off Multi-Layer translucent optical networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Multi-domain integrated grooming algorithm for green IP over WDM network
Computer Communications
Computer Networks: The International Journal of Computer and Telecommunications Networking
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The energy crisis and environmental protection are gaining increasing concern in recent years. ICT (Information and Communication Technology) has a significant impact on the total electricity consumption all over the world. Telecom networks, being an important part of ICT, consume significant energy since more network equipment is deployed annually. Specifically, in IP-over-WDM networks, energy is consumed by network elements at both IP and WDM layers. Routers in the IP layer are the largest energy consumer in this architecture, and current network infrastructures have no energy-saving scheme, so a large amount of energy is wasted when traffic load is low. In this paper, we propose a novel approach to save energy in IP-over-WDM networks by shutting down idle line cards and chassis of routers based on time-of-the-day network traffic variation. A method based on Mixed Integer Linear Programming (MILP) is proposed to ensure that the energy cost incurred by the IP routers and optical cross-connects is minimized by our approach. We also propose some possible approaches to minimize potential traffic disruption when the network elements are shut down.