Abstract
Technology already exists that would allow future optical networks to support automatic lightpath
configuration in response to dynamic traffic demands. Given appropriate commercial drivers, it is possible to
foresee carrier network operators migrating away from semipermanent provisioning to enable on-demand short-duration
communications. However, with traditional lightpath reservation protocols, a portion of the lightpath is idly held
during the signaling propagation phase, which can significantly reduce the lightpath bandwidth efficiency in large
wavelength-division multiplexed backbones. This paper proposes a prebooking mechanism to improve the lightpath
efficiency over traditional reactive two-way reservation protocols, consequently liberating network resources to
support higher traffic loads. The prebooking mechanism predicts the time when the traffic will appear at the optical
cross connects, and intelligently schedules the lightpath components such that resources are only consumed as
necessary. We describe the proposed signaling procedure for both centralized and distributed control planes and
analyze its performance. This paper also investigates the aggregated flow length characteristics with the
self-similar incident traffic and examines the effects of traffic prediction on the blocking probability as well as
the ability to support latency sensitive traffic in a wide-area environment.
© 2007 IEEE
PDF Article
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