Abstract
Provisioning survivable multicast sessions in wavelength-routed
optical networks has already been studied under static or dynamic traffic.
However, in many practical cases, customers tend to require a large bandwidth
at a specified time interval. Scheduled traffic model, in which the setup
and teardown times are known in advance or vary in a specified larger time
window, is more appropriate to characterize this kind of traffic. In this
paper, two scheduled traffic models are formulated and investigated for multicast
protection in wavelength-routed optical networks, namely, Fixed Scheduled
Traffic Model (FSTM) and Sliding Scheduled Traffic Model (SSTM). With the
guaranteed 100% restorability against any single link failure, the FSTM formulation
can achieve a global minimum cost for establishing all multicast sessions.
A two-step optimization approach is further proposed to deal with the survivable
multicast provisioning problem under SSTM. By optimizing the network resources
jointly in space and time, survivable multicast sessions can be provisioned
at much lower costs.
© 2011 IEEE
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