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In this paper a new heuristic algorithm for cost-effective lightpath assignment in mixed line rates WDM networks based on a light trail architecture is proposed. The algorithm improves the performance of a previous heuristic by exploiting the volume discount provided by high-rate lightpaths and the ability of longer paths to groom future traffic demands. Results show that the proposed algorithm is...
Dynamic grooming deals with requests for wavelength allocation based on a dynamic pattern of arrivals in contrast to the situation of static grooming in which the pattern of arrivals must be previously known. Solutions for dynamic grooming typically involve the construction of an auxiliary graph for deciding on the routing and wavelength assignment. An auxiliary graph can represent the network either...
This paper addresses the problem of reducing congestion during logical topology design in de Bruijn WDM networks that can withstand the failure of a single physical link. Survivable routing of a logical topology ensures that the lightpaths are routed in a way that a single link failure does not disconnect the network. Survivable routing of the logical topology demands setting up of additional lightpaths...
In a Wavelength Division Multiplexing (WDM) network, the performance of the virtual topology designed for a pre-specified traffic pattern can be improved by performing virtual topology reconfiguration. Simultaneously, the provision of survivability of WDM networks is important, because the transmission of huge data should be protected when a fiber fails. Thus, the combination of survivability and...
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