Abstract
We address the problem of multicast routing and wavelength assignment
(MClowbarRWA) in wavelength-routed WDM optical networks. Multicast requests are
facilitated in WDM networks by setting up so-called light trees and assigning
wavelengths to them. Objectives of the MClowbarRWA problem include minimizing the
number of distinct wavelengths used to establish a set of multicast requests and
minimizing the cost of the corresponding light trees. This cost can represent the
physical length, delay, or actual cost of a tree. Applications that require quality
of service (QoS) multicasting can impose additional constraints on light trees, such
as a bounded end-to-end delay. Proposed are heuristic algorithms based on bin
packing methods for the general MClowbarRWA problem, which is NP complete. These
algorithms can consider unicast, multicast, and broadcast requests with or without
QoS demands. Computational tests indicate that these algorithms are efficient,
particularly for dense networks.
© 2006 Optical Society of America
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