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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/9944

Title: Virtual topology transition sequence problem on WDM networks with dedicated protection
Authors: Din, Der-Rong
Contributors: 資訊工程系
Keywords: WDM;Transition sequence;Heuristic algorithm;Dedicated protection;Virtual topology reconfiguration
Date: 2009-08
Issue Date: 2012-04-30T04:32:48Z
Publisher: Kluwer Academic Publishers
Abstract: Wavelength-division multiplexing (WDM) technology has emerged as a promising technology for backbone networks. The set of all-optical communication channels (lightpaths) in the optical layer defines the virtual topology for the upper layer applications. Since the traffic
demand of upper layer applications fluctuates from time to time, it is required to reconfigure the underlying virtual topology in the optical layer accordingly. However, the reconfiguration for the virtual topology is reluctantly disruptive to the network since some lightpaths should be torn down and some traffic has to be buffered or rerouted during the reconfiguration process. Therefore, it needs to have an efficient transition method to shift the current virtual topology to the newone so as to minimize the effect of the reconfiguration on the upper layer traffic. In this article, theWDMvirtual topology transition sequence problem (WVTTSP) which minimizes the average weighted delay (AWD) is studied. Since
the WVTTSP is NP-hard, a heuristic solution model is proposed to solve it. Simulation results show that the proposed least weighted distance first (LWDF) method can find the best result and the time spent by it is less than 4 s for a middle- sized network with 100 links and with 30 wavelengths per link.
Relation: Photonic Network Communications, 18(2): 174-182
Appears in Collections:[資訊工程學系] 期刊論文

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