Make-Before-Break Wavelength Defragmentation

Jaumard, Brigitte; Pouya, Hamed; Coudert, David

doi:10.1109/icton.2018.8473893

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…The focus of our paper is primarily on the third phase, while its difficulty depends on the previous ones. This study deepens the previous study [11] on the characteristics of a fragmented optical network and the difficulty to defragment it with the paradigm of make-before-break. In particular, we investigate the deterioration of the GoS (Grade of Service, i.e., the number of granted requests) until we reach a steady state, i.e., a worst case scenario for defragmentation with dynamic traffic.…”

Section: Introductionsupporting

confidence: 76%

Wavelength Defragmentation for Seamless Migration

Jaumard¹,

Pouya²,

Coudert³

2019

J. Lightwave Technol.

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Dynamic traffic in optical networks leads to spectrum fragmentation, which significantly reduces network performance, i.e., increases blocking rate and reduces spectrum usage. Telecom operators face the operational challenge of operating non-disruptive defragmentation, i.e., within the make-before-break paradigm when dealing with lightpath rerouting in wavelength division multiplexed (WDM) fixed-grid optical networks. In this paper, we propose a make-before-break (MBB) Routing and Wavelength Assignment (RWA) defragmentation process, which provides the best possible lightpath network provisioning, i.e., with minimum bandwidth requirement. We tested extensively the models and algorithms we propose on four network topologies with different GoS (Grade of Service) defragmentation triggering events. We observe that, for a given throughput, the spectrum usage of the best make-before-break lightpath rerouting is always less than 2.5% away from that of an optimal lightpath provisioning.

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Section: Introductionsupporting

confidence: 76%

Wavelength Defragmentation for Seamless Migration

Jaumard¹,

Pouya²,

Coudert³

2019

J. Lightwave Technol.

Self Cite

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“…Other works focus on heuristics to solve this problem. As an example, [15] considers the holding time of connections to reduce fragmentation, while the authors of [16] propose a make-before-break (MBB) defragmentation, rejecting connections that cannot be reconfigured by this strategy.…”

Section: Spectrum Defragmentation Over Eonsmentioning

confidence: 99%

Spectrum Defragmentation in Elastic Optical Networks: Two Approaches With Metaheuristics

et al. 2019

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This work introduces two novel approaches for the selection of active lightpaths that perform a spectrum defragmentation process in elastic optical networks (EONs). The algorithms, named DF-Ants and DF-Gen, are based on ant colony optimization and genetic metaheuristics, respectively, and their objective is to minimize the fragmentation of the entire network, evaluated with two different fragmentation metrics. In this way, the blocking probability is expected to be minimized with the fewest number of reconfigured possible connections. Furthermore, a new performance metric for spectrum defragmentation is also presented, named weighted blocking rate (WBR). Unicast traffic simulations were conducted, showing the feasibility of the proposal.

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Make-Before-Break Wavelength Defragmentation

Cited by 2 publications

References 7 publications

Wavelength Defragmentation for Seamless Migration

Wavelength Defragmentation for Seamless Migration

Spectrum Defragmentation in Elastic Optical Networks: Two Approaches With Metaheuristics

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