Spectrum Fragmentation Analysis in a Two-Rate Elastic Optical Link

Yan, Shuyi; Kim, Joobum; Wang, Xue; Fumagalli, Andrea

doi:10.1364/networks.2015.nem2f.4

Cited by 8 publications

(4 citation statements)

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“…We observed the evolution of average network spectrum utilization (Utilization in figs. 6,7,8), the average link-based external fragmentation metric (L-EFM), the average blocked requests to total requests ratio (BR/TR), and the average adapted vectored-fragmentation metric (AVFM), i.e., (1-ν norm ), till the arrival of initial 5000 connection requests. We also observed average adapted-α (A-alpha) and adapted-β (A-beta) components as individual fragmentation indicators as defined by relations in eq.…”

Section: Resultsmentioning

confidence: 99%

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A Vectored Fragmentation Metric for Elastic Optical Networks

Sharma¹,

Lohani²,

Singh³

2021

Preprint

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When circuits are set up and dismantled dynamically in elastic optical networks, spectrum tends to become fragmented in the fiber links. The fragmentation limits the available path choices and may lead to significant blocking of connection requests. There are two types of fragmentation in the network spectrum-in the links due to contiguity constraints and over the paths due to continuity. Study of fragmentation and its management is essential to operate the networks efficiently. This paper proposes a vectored fragmentation metric for characterizing the fragmentation, which covers both types of fragmentation. We discuss the characteristics of this metric in both transient and steady-state of the dynamic network. We also test the proposed metric for connection requests' granularity range, arrival rates and holding times, to establish functionality of this metric. We also compare the link-based fragmentation metric with our Vectored Fragmentation Metric to understand the better representation.

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Section: Resultsmentioning

confidence: 99%

“…2). A few works with Markov Chain (MC) model tried to characterize the fragmentation in network by using a single channel and a super-channel services, [7], [8]. The blocking probability plot of individual services shows how the single channel requests rob off the resources from superchannel requests.…”

Section: B Spectrum Fragmentationmentioning

confidence: 99%

A Vectored Fragmentation Metric for Elastic Optical Networks

Sharma¹,

Lohani²,

Singh³

2021

Preprint

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“…TRR offers better blocking probability and fairness than Semi-flex algorithm. Notably, some of the curves show oscillating patterns, which are further analyzed in [10]. Figure 7 refers to the case of m = 1, n = 8 and AR = 2.…”

Section: Icton 2015mentioning

confidence: 99%

Blocking fairness in two-service EONs with uneven arrival rates

Kim

Wang

WangYan

et al. 2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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Routing and Spectrum Assignment (RSA) algorithms play a key role in achieving good spectrum utilization in Elastic Optical Networks (EONs). A metric that is often used to evaluate RSA algorithms is the overall blocking probability experienced by circuit requests. In a previous study, the authors introduced an additional performance indicator that can be used to quantify the level of fairness (or lack thereof) experienced by two types of service requests, each type requiring a distinct amount of reserved spectrum. Their study is extended in this paper to account for circuit requests with uneven arrival rates.

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“…Due to the complexity of the fragmentation phenomenon, a few analytical models have been proposed so far to rigorously quantify this problem [8]. For example, the study in [9] presents a simple but not always accurate analytical model for computing the blocking probability of both single-slice and n-slice circuits in a single fiber link.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Model of Spectrum Fragmentation in a Two-Service Elastic Optical Link

Kim

Yan

Fumagalli

et al. 2015

2015 IEEE Global Communications Conference (GLOBECOM)

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Elastic Optical Networks (EONs) enable optical circuits to be assigned distinct numbers of spectrum slices. Individual circuits can then be assigned an optimal number of slices to best match their target transmission rates. A well-known drawback of EONs is spectrum fragmentation and its resulting uneven blocking probability, which circuit requests experience when the available spectrum slices in the fiber are insufficient or not contiguous. Capturing this spectrum fragmentation problem analytically is a challenging problem. Not surprisingly, most of the existing studies at this time mainly use simulationbased techniques to quantify blocking probability in EONs. In this paper, the authors present a Markov Chain (MC) model that attempts to characterize the fragmentation problem in a simplified scenario, i.e., only two types of circuit services are allowed over a single fiber link. Despite its limited scope, this initial analytical effort is able to accurately capture the nonmonotonic behavior of the blocking probability in EONs for the first time.

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Spectrum Fragmentation Analysis in a Two-Rate Elastic Optical Link

Cited by 8 publications

References 0 publications

A Vectored Fragmentation Metric for Elastic Optical Networks

A Vectored Fragmentation Metric for Elastic Optical Networks

Blocking fairness in two-service EONs with uneven arrival rates

An Analytical Model of Spectrum Fragmentation in a Two-Service Elastic Optical Link

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