Abstract
Reassignment of calls to different wavelengths on blocking can be used
in WDM networks without wavelength conversion to get almost the same performance
as that of WDM networks with wavelength conversion for circuit switched traffic . However, in a few networks,
we did find that while the reassignment on blocking does improve the performance
of WDM networks without wavelength conversion, the performance falls short
of that of wavelength conversion networks. In this paper, we analyze the reasons
for this behavior in these networks. On identifying certain critical nodes
as a cause of this behavior, we propose a rerouting technique around the critical
node. With a small amount of rerouting, this bottleneck can be removed and
the performance of WDM networks without wavelength conversion becomes almost
equal to that of networks with wavelength conversion, thus making the wavelength
conversion (costly) feature, as redundant. In this paper, we also propose
a technique to carry out seamless wavelength reassignment so as not to disrupt
traffic during the wavelength reassignment process.
© 2008 IEEE
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