Improving Link Spectrum Utilization in Flexgrid Optical Networks

Comellas, Jaume; Junyent, G.

doi:10.1364/jocn.7.000618

Cited by 14 publications

(24 citation statements)

References 20 publications

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“…In the absence of the required number of slots, the request is rejected. According to some authors the First Fit spectrum allocation policy is considered as one of the best allocation policies due to the small blocking probability and the low computational complexity function [8]. Exact Fit spectrum allocation policy tries to select from available slots of the path the block of adjacent slots whose size is equal to number of required slots for arriving requests.…”

Section: Introductionmentioning

confidence: 99%

“…In [8], simple methods have been proposed to improve the use of spectrum in the network. However, the price for this is to limit the bandwidth flexibility of arriving requests.…”

Section: Introductionmentioning

confidence: 99%

“…In this work it was demonstrated that adopting multi-rate connections reduces spectrum fragmentation on network links. For requests from sets {2, 5, 8} of slots (marked in [8] as 2-5-8) more than 5% decrease in blocking probability was achieved by decreasing spectrum fragmentation on the link compared to flexible requests assuming values from 1 to 8 slots. Whereas in the case of network analysis, gain of 4% was obtained in comparison to elastic requests from 1 to 8 slots.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, for highest load values, the spectral fragmentation ratio is much smaller than for Complete Sharing and Pseudo Partition. The common feature of both articles [6] and [8] is that the arriving spectrum requests belong to two very limited sets of slots.…”

Section: Introductionmentioning

confidence: 99%

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Spectrum Allocation Policy in Elastic Optical Networks

Olszewski

2017

International Journal of Electronics and Telecommunications

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Abstract-The considered problem covers routing and spectrum allocation problem (RSA problem) in Elastic Optical Networks while maintaining the spectrum continuity constraints, non-overlapping spectra constraints for adjacent connections on individual links of the network and spectrum contiguity constraints of the connection. In this article the modified version of the First Fit spectrum slot allocation policy for Fixed Alternate Routing in flexible optical networks has been proposed. The Fixed Alternate Routing with proposed spectrum allocation policy rejects fewer requests, provides less bandwidth blocking probability and less spectrum fragmentation than Fixed Alternate Routing with well-known First Fit and Exact Fit spectrum allocation policies. However, the cost of improving these parameters is a higher computational complexity of the proposed allocation policy.

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Section: Introductionmentioning

confidence: 99%

“…In [8], simple methods have been proposed to improve the use of spectrum in the network. However, the price for this is to limit the bandwidth flexibility of arriving requests.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectrum Allocation Policy in Elastic Optical Networks

Olszewski

2017

International Journal of Electronics and Telecommunications

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“…Thus, uninterrupted transfer of data is highly necessary. [10][11] dealt about the use of multiple paths to improve the throughput and reduce the blocking probability. [12] used shared backup path protection scheme and with a limited tuning range of a transponder, the Bandwidth Blocking Probability is reduced and spectrum efficiency is improved.…”

Section: Introductionmentioning

confidence: 99%

Efficient Spectrum Allocation with Survivability Technique in Elastic Optical Networks

Krishnamoorthy¹,

Sivasubramanian²,

Arumugam³

et al. 2016

IJUNESST

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Hop distance–based bandwidth allocation technique for elastic optical networks

Mavridopoulos

Beletsioti

Nicopolitidis

et al. 2020

Int J Communication

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Summary Elastic optical networks (EON) have emerged as a solution to the growing needs of the future internet, by allowing for greater flexibility, spectrum efficiency, and scalability, when compared to WDM solutions. EONs achieve those improvements through finer spectrum allocation granularity. However, due to the continuity and contiguity constrains, distant connections that are routed through multiple hops suffer from increased bandwidth blocking probability (BBP), while more direct connections are easier to form. This paper proposes HopWindows, a novel method that strategically allocates bandwidth to connections based on their hop distance. This new algorithm applies masks that control the range of frequency slots (FSs) allocated to each n‐hop connection. Furthermore, a new network metric is introduced, the normalized bandwidth blocking probability (normalized BBP). Utilization of this metric ensures increased fairness to distant connections. Extended simulation results are presented which indicate that the proposed HopWindows method achieves a superior performance over the well‐known FirstFit algorithm. The proposed algorithm may achieve a decrease in bandwidth blocking probability of up to 50%.

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Improving Link Spectrum Utilization in Flexgrid Optical Networks

Cited by 14 publications

References 20 publications

Spectrum Allocation Policy in Elastic Optical Networks

Spectrum Allocation Policy in Elastic Optical Networks

Efficient Spectrum Allocation with Survivability Technique in Elastic Optical Networks

Hop distance–based bandwidth allocation technique for elastic optical networks

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