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In this article, we study the blocking probability in a wavelength division multiplexing (WDM) based asynchronous bufferless
optical burst switched (OBS) network, equipped with a bank of wavelength converters. Our analysis encloses two wavelength
reservation schemes JIT (just-in-time) and JET (just-enough-time), and two-class data rate. The contribution of our work includes:
(i) derivation of an accurate model for blocking probability of lower priority bursts in case of a non-preempted model; (ii) provision of the analytical model for blocking probability calculation in the OBS network, which includes these
variables: two signaling schemes, partial wavelength conversion, two-class data, traffic intensity, cross-connect speed, number
of wavelengths in WDM fiber, number of fibers in the node, number of wavelength converters, and number of nodes in the path;
(iii) simulation results, which show that partial wavelength conversion provide quite satisfactory quality of service. We
compare performance in a single OBS node, under various sets of parameter values. The OBS network shows great flexibility
in terms of used multiclass data, and there is no dependence on the used higher layer protocol. 相似文献
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In this paper we study translucent optical networks as an alternative to fully transparent and fully opaque optical networks.
In the former networks, a technique called sparse placement is used to overcome the lightpath blocking caused by the signal
quality degradation, using much less regenerators, which must strategically be placed, in contrast to a fully opaque network.
In this paper we propose a sparse placement algorithm based on two requirements. The first one is signal regeneration necessary
to re-amplify, reshape, and retime the optical signals after some predefined transparent distance in order to successfully
receive the signals at the destination node. The other is load balance of the traffic in the network aimed at efficient usage
of the network capacity resources. We apply a distributed Dijkstra routing algorithm which dynamically changes weights of
links during the process of locating regeneration capable nodes. We compare the performance of the proposed algorithm with
commonly used sparse placement algorithms through simulation experiments. The benefits are such that load balancing of the
network traffic is fully utilized, and with technological development it will be sufficient to equip up to 30% of nodes in
the network with electronic regenerations in order to have the same performance as in an opaque network.
相似文献
Jovan RadunovićEmail: |
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Bocokić V Lutz M Spek AL Reek JN 《Dalton transactions (Cambridge, England : 2003)》2012,41(13):3740-3750
In this paper we report the application of bis-(thiosemicarbazonato) Zn(II) complexes as building blocks in the construction of supramolecular transition metal assemblies. We investigated their coordination behaviour towards pyridylphosphine molecules and found these systems comparable to those based on Zn(porphyrin) and Zn(salphen) complexes. Additionally, catalytic experiments and an in situ high-pressure FTIR study of the supramolecular rhodium hydroformylation catalysts, assembled using the bis-(thiosemicarbazonato) Zn(II) complexes, demonstrate their applicability in supramolecular catalysis and their potential for application in other areas of supramolecular chemistry. 相似文献
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