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Proceedings Paper

Loose virtual topology design for WDM networks
Author(s): Helio Waldman; Karcius Day Rosario Assis; Jose Renato Paula Naves
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Paper Abstract

Traditional approaches to wavelength routing network design divide it into two separate problems: virtual topology design (VTD), in which best connections among nodes are derived from traffic demand, generating requests for connections; and routing-and-wavelength assignment (RWA), in which physical paths are accommodated in the physical topology to support the requested connections. This separation is necessitated by complexity, but it is suboptimal and will only yield the best static solution. For the case of dynamic traffic, one needs to set up a connection for each request as it arrives, and the lightpath is released after some finite amount of time. The routing and wavelength assignments must then preserve enough open capacity to avoid blocking of future requests. Several algorithms have been proposed for this purpose. We consider a loose topology, in which static and dynamic traffic demands share the physical resources of the network. For this purpose, the static assignment problems (VTD and RWA) are solved so that blocking probability is minimized for the dynamic traffic while minimum performance objectives are met for the static demand. The proposed strategy entails the use of the dynamic RWA heuristics to guide the solution of the static VTD/RWA problem.

Paper Details

Date Published: 9 September 2002
PDF: 12 pages
Proc. SPIE 4910, Optical Networking II, (9 September 2002); doi: 10.1117/12.482444
Show Author Affiliations
Helio Waldman, Univ. Estadual de Campinas (Brazil)
Karcius Day Rosario Assis, Univ. Estadual de Campinas (Brazil)
Jose Renato Paula Naves, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 4910:
Optical Networking II
Shizhong Xie; Chunming Qiao; Yun Chur Chung, Editor(s)

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