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Heuristic Approaches for Periodic Reconfiguration of Lightpath-based Networks under Multi-hour Traffic

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Author(s): Ramon Aparicio-Pardo | Belen Garcia-Manrubia | Nina Skorin-Kapov | Pablo Pavon-Marino

Journal: Journal of Networks
ISSN 1796-2056

Volume: 7;
Issue: 5;
Start page: 800;
Date: 2012;
Original page

Keywords: virtual topology design | network planning | multi-hour traffic | lagrangean relaxation | tabu search

ABSTRACT
Periodic lightpath reconfiguration of virtual topologies in transparent optical networks has been recently investigated as a mechanism to more efficiently adapt the network to predictable periodic traffic variations along a day or week. Scheduling periodic reconfigurations involves tuning a trade-off between a lower network cost obtained through better resource allocation, and undesired traffic disruptions that these reconfigurations may cause. This paper presents and compares two algorithms for planning a reconfigurable virtual topology suitable for exploring this trade-off. The first is based on a Lagrangean Relaxation of the planning problem, and the second is based on a Tabu Search meta-heuristic. The merits of both algorithms are assessed for moderate network sizes through comparison with analytical lower bounds and exact solutions obtained by a MILP formulation.
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