Abstract
In optical Wavelength-Division-Multiplexing (WDM) networks, multicast
becomes more and more popular to provide high-speed communication between
one point and multiple points. At the same time, the ports of Optical
Cross-Connect (OXC) are greatly enhanced with the increasing number of
wavelengths in fibers, and then the waveband switching technique is proposed
to save the ports and reduce the cost of OXC. However, current waveband
grooming algorithms are all limited in unicast. To achieve the multicast
communication and meanwhile save the ports of OXC, we need to solve the
multicast grooming, routing and wavelength/waveband assignment problem which
is the HP-hard. In this paper, we propose a heuristic algorithm named
Integrated Multicast Waveband Grooming (IMWG) based on Multicast Layered
Auxiliary Graph (MLAG) that includes a Virtual Topology Layer (VTL) and
multiple Waveband-Plane Layers (WPLs) to support the single-hop, multi-hop
and hybrid multicast waveband grooming. For each demand, IMWG first computes
a single-hop or multi-hop grooming waveband-tree on VTL. If the grooming
waveband-tree cannot be found on VTL, IMWG computes a new waveband-tree on
WPL. If the new waveband-tree cannot be found on WPL, IMWG computes a hybrid
grooming waveband-tree on MLAG. Simulation results show that, compared with
other algorithms, IMWG is able to obtain better performances.
© 2010 IEEE
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