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Design method of logical topologies with quality of reliability in WDM networks (2002)
| Citations: | 2 - 0 self |
BibTeX
@MISC{Katou02designmethod,
author = {Junichi Katou},
title = {Design method of logical topologies with quality of reliability in WDM networks},
year = {2002}
}
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Abstract
According to a rapid growth of the bandwidth capacity of the WDM network, traffic loss due to a failure of the network components is becoming unacceptable. To overcome this problem, a protection method that prepares backup lightpaths for each working path is now considered to enhance the reliability of networks. In this thesis, we first introduce a new concept of QoR (Quality of Reliability), which is one realization of QoS with respect to the reliability suitable to the WDM network. We define QoR in terms of a recovery time from when a failure occurs to when traffic on the affected primary lightpath is switched to the backup lightpath. We then propose a heuristic algorithm to design a logical topology with satisfying QoR requirement for every node pair. Our objective is to minimize the number of necessary wavelengths on a fiber in the logical topology to carry the traffic with required QoR. We compare our newly proposed algorithm with existing two algorithms and show that our proposed algorithm can utilize wavelength resources effectively; by using our proposed algorithm, the number of necessary wavelengths is at most 25% less than those by the other two algorithms.
Keyphrases
logical topology wdm network design method necessary wavelength affected primary lightpath rapid growth new concept backup lightpaths qor requirement network component backup lightpath protection method wavelength resource recovery time node pair heuristic algorithm traffic loss bandwidth capacity
