Regulative Wavelength Grouping Approach for QoS in OBS Networks

Aydın, Muhammed Ali; Atmaca, Tülin; Turna, Özgür Can; Zaim, H.; Eido, Thaere

doi:10.1109/aict.2009.50

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…There are two approaches for RWG: Regulative Static Wavelength Grouping (RSWG) and Regulative Dynamic Wavelength Grouping (RDWG) [17]. RSWG is less complex and simpler than RDWG, but RDWG is more efficient in terms of network performance [17]. In this study we used RDWG algorithm for support QoS in core nodes.…”

Section: Quality Of Service In Obsmentioning

confidence: 99%

“…It is difficult to prioritize the traffic classes in the core nodes because of OBS structure. To cope with this difficulty, in our previous study we propose a new QoS mechanism called Regulative Wavelength Grouping (RWG) [17]. In RWG mechanism, the number of wavelengths for each traffic class, is arranged for adjusting the burst drop probability of traffic classes under a specific threshold value and is used for providing priority levels in core nodes.…”

Section: Quality Of Service In Obsmentioning

confidence: 99%

“…The drop rate of class C i (i = 0, 1, 2) cannot increase above a predefined maximum threshold value Pthresh(C i ) for the whole network. There are two approaches for RWG: Regulative Static Wavelength Grouping (RSWG) and Regulative Dynamic Wavelength Grouping (RDWG) [17]. RSWG is less complex and simpler than RDWG, but RDWG is more efficient in terms of network performance [17].…”

Section: Quality Of Service In Obsmentioning

confidence: 99%

See 2 more Smart Citations

Performance Study of New OBS Channel Scheduling Algorithms in a Multiservice Network

Aydın

Atmaca²,

Turna³

et al. 2009

2009 Fifth International Conference on Networking and Services

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This paper presents a comparative study between JET (Just Enough Time) and a number of new preemptive channel scheduling algorithms in Optical Burst Switching (OBS) with QoS (Quality of Service) requirement. In terms of performance criteria, loss rate in byte, access delay and end-toend delay are considered. A 2-state MMPP (Markov Modulated Poisson Process) traffic generator on a 14-node mesh network topology illustrating NSFNET is designed as the testbed. NS2 Network Simulation tool is used for our tests. Bursts are created using a hybrid model that takes into account both timeout and maximum length threshold mechanisms. In core and edge nodes, in order to satisfy QoS requirements two mechanisms such as Regulative Wavelength Grouping (RWG) and priority based queuing are used. RWG mechanism, where the number of wavelengths for each traffic class is arranged for adjusting the burst drop probability of traffic classes under a specific threshold value, is used for providing priority levels in core nodes. In priority based queuing, bursts are sent according to their priority order, in edge nodes. Simulation works have shown that our preemptive channel scheduling algorithms give better results compared to the other studied algorithms while considering QoS.

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Section: Quality Of Service In Obsmentioning

confidence: 99%

Section: Quality Of Service In Obsmentioning

confidence: 99%

Section: Quality Of Service In Obsmentioning

confidence: 99%

See 1 more Smart Citation

Performance Study of New OBS Channel Scheduling Algorithms in a Multiservice Network

Aydın

Atmaca²,

Turna³

et al. 2009

2009 Fifth International Conference on Networking and Services

Self Cite

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“…This situation has been taking care off on a different context. For example, in the OBS context, diverse schemes have been presented concerning the quality of services, such as Wavelength Grouping and Intentional Dropping, among others [18,19,20]. However, this situation has not been studied in the current optical networks with wavelength continuity constraints.…”

Section: Introductionmentioning

confidence: 99%

How much the wavelength dimensioning methods and a tightened QoS provision impact on the dynamic WDM optical networks capacity?

Jara

Pempelfort

Rubino

et al. 2020

Optical Switching and Networking

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This article gives an insight on the importance to assign a different capacity to each network link and to tighten the Quality of Service (QoS) provision in the network, in dynamic WDM Optical Networks with wavelength continuity constraints. In the text, several examples illustrate the performance of different strategies. The usual procedure to compute the number of wavelengths of each network link consists of choosing the same capacity to each link on the network. This decision is selected, in most cases, by simplicity and simulation limitations. Notwithstanding, there are no technical motives to force a uniform capacity on the network. In consequence, we analyze the impact on the network capacity of designating the minimum amount of wavelengths to each network link, while satisfying each user QoS requirement. Moreover, despite the chosen dimensioning strategy, it is usual to offer a much better QoS than requested for some users, with the corresponding waste of resources. We can amend this issue by limiting which wavelengths are available to each user according to its particular QoS constraint. This technique, known as Wavelength Grouping, seeks to provide to each user a QoS level closer to the one defined in the Service Level Agreement. By doing so, it is possible to reduce the network capacity needed to allow communication to its user, or diminishing the network blocking probability for a given wavelength capacity. In spite of the usual approach, in this work, we demonstrate that a nonuniform dimensioning strategy and a tighten QoS provision allows to save significant networks capacity, while simultaneously provisioning to each user the QoS established in its Service Level Agreement. This fact is very relevant nowadays, where an impending capacity crunch in optical networks is an important issue.

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