Towards dynamic wavelength grouping for QoS in optical burst-switched networks

Khan, Farrukh Zeeshan; Hayat, Muhammad Faisal; Holynski, Tomasz; Khan, Muhammad Ayub

doi:10.1109/tsp.2017.8075941

Cited by 4 publications

(9 citation statements)

References 17 publications

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“…Traditionally, wavelength assignment is fixed so it is termed as Static Wavelength Grouping (SWG). All the wavelengths are distributed into disjoint wavelength subgroups and one subgroup is dedicated exclusively for only one priority traffic [14], [40]. Here, QoS is realized with unfair partitioning of available wavelengths.…”

Section: Quality Of Service (Qos) In Ops Networkmentioning

confidence: 99%

“…Therefore, the total blocking probability increases resulting less throughput of the network. This fact is established in our previous work [14]. The solution to this problem is to group wavelengths dynamically according to incoming traffic load.…”

Section: Introductionmentioning

confidence: 97%

“…In this research work, we propose a novel QoS approach categorized as Dynamic Wavelength Grouping for OPS (DWG-OPS). We would point out that the static wavelength grouping, and its impact on overall performance of OBS networks have already been considered in [14]. However, there remains some constraints in static wavelength grouping, if traffic share of High Priority (HP) traffic is very less as compared to total traffic, the static wavelengths assigned to HP traffic remain underutilized.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Wavelength Grouping for Quality of Service in Optical Packet Switching

et al. 2021

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This paper concerns Quality of Service (QoS) provisioning in Optical Packet Switching (OPS) networks. We address the topic by proposing Dynamic Wavelength Grouping (DWG) for OPS, in this technique, available wavelengths are dynamically partitioned and allocated at each network link to particular classes of service. DWG adapts to traffic fluctuations by tracking the load status of every class of traffic and then schedules optical packets over group of wavelengths assigned for each class of service. Performance is examined using an own developed simulator. This simulator models various aspects of OPS in far detail. Two network topologies are studied under various parameter settings and traffic scenarios. DWG clearly outperforms its earlier static counterpart (SWG). It appears as flexible approach, efficiently functional even when the share of the high-priority load is temporarily low. Consequently, it minimizes the total blocking probability while preserving the desired service differentiation. We report also significant improvements in the network throughput.INDEX TERMS Dynamic wavelength grouping(DWG) , Network simulation , Optical packet switching , Quality of service.

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Section: Quality Of Service (Qos) In Ops Networkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Dynamic Wavelength Grouping for Quality of Service in Optical Packet Switching

et al. 2021

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“…With the burst assembly, QoS differentiation can be made by setting differential offset times [7,8] or burst lengths [9,10] for priority classes. In the case of resource allocation-based QoS differentiation, wavelengths can be statically or dynamically grouped to allocate for priority classes [12]. QoS aware resource allocation can be done during the operation of routing and wavelength assignment (RWA), that is formulated as a bi-objective optimization problem and an evolution algorithm is used to find routing strategies for priority classes [13].…”

Section: Related Workmentioning

confidence: 99%

A mechanism of QoS differentiation based on offset time and adjusted burst length in OBS networks

Vo¹,

Pham²,

Chương³

et al. 2020

Turk J Elec Eng & Comp Sci

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Quality of service (QoS) differentiation is an integral component of any networking system, particularly, with the current and future great diversity of users' applications and their manifold requirements. In optical burst switching (OBS) networks, there are two approaches for QoS differentiation: one is based on offset time and the other is based on burst length. This paper presents a mechanism of QoS differentiation based on both offset time and burst length, in which the offset times are calculated to achieve a complete isolation of data loss between priority classes and the burst length is adaptively adjusted according to the feedbacked void size. The simulation results show that the mechanism of QoS differentiation based on offset time and adjusted burst length not only increases the successful scheduling rate but also reduces the burst delay.

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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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Towards dynamic wavelength grouping for QoS in optical burst-switched networks

Cited by 4 publications

References 17 publications

Dynamic Wavelength Grouping for Quality of Service in Optical Packet Switching

Dynamic Wavelength Grouping for Quality of Service in Optical Packet Switching

A mechanism of QoS differentiation based on offset time and adjusted burst length in OBS networks

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

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