A New Algorithm for the Distributed RWA Problem in WDM Networks Using Ant Colony Optimization

Aragón, Víctor M.; Miguel, Ignacio de; Durán, Ramón J.; Merayo, N.; Aguado, Juan Carlos; Fernández, Patricia; Lorenzo, Rubén M.; Abril, Evaristo J.

doi:10.1007/978-3-540-72731-6_33

Cited by 4 publications

(2 citation statements)

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“…(This effect of reduction of the blocking probability due to outdated databases when increasing the load by augmenting the duration of the connections has also been reported in other works on distributed lightpath establishment, e.g. [21,22]). Fig.…”

Section: Advantages Of Using Etm In An On-demand Lightpath Establishmsupporting

confidence: 70%

Experimental assessment of a cognitive mechanism to reduce the impact of outdated TEDs in optical networks

et al. 2015

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We have recently proposed and demonstrated, by means of simulation, the benefits of a simple yet effective cognitive technique to enhance stateless Path Computation Element (PCE) algorithms with the aim of reducing the connection blocking probability when relying on a potentially non up-to-date Traffic Engineering Database (TED). In this paper, we employ that technique, called Elapsed Time Matrix (ETM), in the framework of the CHRON (Cognitive Heterogeneous Reconfigurable Optical Network) architecture and, more importantly, validate and analyse its performance in an emulation environment (rather than in a simulation environment) supporting impairment-aware lightpath establishment. Not only dynamic lightpath establishment on demand has been studied, but also restoration processes when facing optical link failures. Emulation results demonstrate that ETM reduces the blocking probability when establishing lightpaths on demand, and increases the percentage of successful restorations in case of optical link failure. Moreover, the use of that technique has little impact on lightpath setup time and lightpath restoration time, respectively. Keywords-cognition, dynamic lightpath establishment, emulator, outdated database traffic engineering database 1 IntroductionOptical transport networks are increasing their complexity due to the use of heterogeneous transmission technologies and the support of services with different requirements [1]. One solution to efficiently control such heterogeneous optical networks comes from the use of cognitive techniques [2]. A cognitive network is defined as "a network with a process that can perceive current network conditions, and then plan, decide, and act on those conditions. The network can learn from these adaptations and use them to make future decisions, all while taking into account end-to-end goals" [2]. Cognitive networks involve the utilization of three types of elements: monitoring elements, which enable the network to be aware of current conditions; software adaptable elements, which enable the network to adapt to changing conditions; and cognitive processes, which learn or make use of past history to improve performance.Cognitive networks have proved to be an excellent solution for wireless networks [3], and have also been recently proposed for optical networks [4], like the CHRON (Cognitive Heterogeneous Reconfigurable Optical Network) approach [5,6]. The CHRON architecture, which will be briefly presented in Section II, is based on a central computation entity, the Cognitive Decision System (CDS) [7], which is responsible of making decisions on how to configure devices and deal with traffic demands, taking into account the current network status. As its name suggests, the CDS leverages on a learning process to improve its performance with acquired experience.When dealing with a lightpath establishment procedure, the CDS adopts a role similar to that of the Path Computation Element (PCE) [8], which has lately received increasing attention in the optical networking community. T...

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Section: Advantages Of Using Etm In An On-demand Lightpath Establishmsupporting

confidence: 70%

Experimental assessment of a cognitive mechanism to reduce the impact of outdated TEDs in optical networks

et al. 2015

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“…Aragon et al also used ACO to solve the RWA problem in WDM networks. They have shown that ACO outperforms other distributed routing algorithms applied in WDM networks.…”

Section: Routing Algorithms For Optical Burst Switched Networkmentioning

confidence: 99%

A review of routing strategies for optical burst switched networks

Coulibaly

Latiff

Ababou

2011

Int J Communication

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SUMMARY The exact contribution of this paper is a review of existing state‐of‐the‐art routing strategies for optical burst switched networks developed by researchers to deal with burst contention before it happens. Routing schemes are implemented in space domain, which make them simple and cost effective. Additionally, the paper points out the importance of routing as an effective way to deal with burst contention compared to other solutions. It also underlines the main differences between contention avoidance schemes and contention resolution techniques for optical burst switched networks. We believe that this review will help different optical burst switched researchers involved in the development of route optimization algorithms to control burst contention. Copyright © 2011 John Wiley & Sons, Ltd.

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Improved offline multi-objective routing and wavelength assignment in optical networks

Kaur

Rattan

2019

Front. Optoelectron.

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A New Algorithm for the Distributed RWA Problem in WDM Networks Using Ant Colony Optimization

Cited by 4 publications

References 6 publications

Experimental assessment of a cognitive mechanism to reduce the impact of outdated TEDs in optical networks

Experimental assessment of a cognitive mechanism to reduce the impact of outdated TEDs in optical networks

A review of routing strategies for optical burst switched networks

Improved offline multi-objective routing and wavelength assignment in optical networks

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