Abstract
One approach to accommodating traffic on a wavelength-routed optical
network is to construct a virtual network topology (VNT) by establishing a
set of lightpaths between nodes. To accommodate fluctuating traffic on a
VNT, we propose an adaptive VNT control method, which reconfigures VNTs
according to traffic conditions on VNTs, in IP over wavelength-routed
wavelength-division-multiplexing networks. To achieve adaptability in the
VNT control method, we focus on attractor selection, which models
behaviors where biological systems adapt to unknown changes in their
surrounding environments and recover their conditions. The biological system
driven by attractor selection adapts to environmental changes by selecting attractors at which the system
condition is preferable. Our VNT control method uses deterministic and
stochastic behaviors and controls these two appropriately by simple feedback
of the conditions of an IP network. By utilizing stochastic behavior, our
new approach adapts to various changes in traffic demand with selecting
suitable attractors, which correspond to VNTs in our method, for the current
traffic demand. Moreover, to define feedback of the conditions on the IP
network, our proposed scheme only uses load information on links, which is
easily and directly retrieved and thus achieves quick responses to changes
in traffic demand. The simulation results indicate that our VNT control
method based on attractor selection quickly and adaptively responds to
various changes in traffic demand, and our method adapts to at most twice
larger changes in traffic demand than existing heuristic approaches.
© 2010 IEEE
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