Dimensioning WDM Networks for Dynamic Routing of Evolving Traffic

Zhang, Xiaolan J.; Kim, Sunil; Lumetta, Steven S.

doi:10.1364/jocn.2.000730

Cited by 11 publications

(6 citation statements)

References 36 publications

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“…This procedure consists in finding, for each link ∈ L, a capacity W such that the end-to-end blocking probability BP c of every user c ∈ X passing through the link is less than the given threshold β c . For different reasons, the usual dimensioning procedures consider homogeneity in the links' capacities, that is, look for the minimum capacity W, the same on all links, such that the performance objective is reached [39]- [41]. We will then follow here the same approach, because this facilitates comparisons with existing methods.…”

Section: B Definitions and Sub-procedures Needed By Our Methodsmentioning

confidence: 99%

A Fault-Tolerance Solution to Any Set of Failure Scenarios on Dynamic WDM Optical Networks With Wavelength Continuity Constraints

et al. 2020

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Survivability of internet services is a significant and crucial challenge in designing optical networks. A robust infrastructure and transmission protocols are needed to maintain communication, despite the existence of one or more failed components on the system. Here, we present a generalized approach to tolerate any set of failure scenarios to the extent network users can still communicate with the remaining components, where a scenario is an arbitrary set of links in a non-operational state. We propose a joint solution to assess the survivability problem. The issues to be solve simultaneously are as follows: the set of primary routes, a collection of alternate routes associated with each failure scenario, and the capacity required on the network to allow communication between all users, in spite of any considered failure scenario, while satisfying for each user a specific predefined quality of service threshold, defined in the Service Level Agreement (SLA). Numerical results show that the proposed approach not only enjoys the advantages of low complexity and ease of implementation, but it is also able to achieve significant resource savings compared to existing methods. The savings are higher than 30% on single link failures and more than 100% on two simultaneous link failures cases or in more complex failure scenarios. INDEX TERMS Network capacity, optical networks, quality of service, routing, survivability.

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Section: B Definitions and Sub-procedures Needed By Our Methodsmentioning

confidence: 99%

A Fault-Tolerance Solution to Any Set of Failure Scenarios on Dynamic WDM Optical Networks With Wavelength Continuity Constraints

et al. 2020

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“…Quality level means, here, maximal user blocking probability. As mentioned in this paper introduction, most methods to compute the network capacity consider a worst-case scenario, assigning the same number of wavelengths to each network link [9,10,11] (Uniform Dimensioning strategy). However, to allocate a different amount of wavelengths to each link may provide benefits in terms of network savings, while still ensuring the agreed level of quality of service to each user.…”

Section: Wavelength Dimensioning Strategiesmentioning

confidence: 99%

“…Most wavelength dimensioning strategies consider a worst-case scenario to compute the capacity of the links in optical networks. This scheme, denoted as Uniform Dimensioning (UD), assigns the same number of wavelengths to each link, while ensuring a given quality of service (QoS) to all users, even on the more congested link [9,10,11]. However, it is quite common to find network links with higher usage than others, measured by the number of users, or the traffic load on the links (for instance, the commonly used shortest path strategy tends to concentrate the majority of the user paths on a subset of links of the network).…”

Section: Introductionmentioning

confidence: 99%

“…Once the dimensioning strategy is decided, a topic that arises is how to ensure a given QoS level required by each user. The common approach is to satisfy the QoS to all users [8,12,9,11,17], guaranteeing the quality of service of the most demanding one, which reduces to give all users the same worst-case scenario QoS, obviously wasting resources. However, again with an impending capacity crunch approaching optical networks, this over-provision of QoS to some users may achieve significant waste of resource.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The emergence of high data rate newly developed Internet and mobile applications, including video communication, peer-to-peer and distributed computing, and healthcare applications are also generating high-bandwidth but variable short-lived traffic demands [ 6 ]. The volume of variable traffic demands will further increase when dynamic WDM networking becomes stable and more cost efficient [7][8][9]. Resource dimensioning, including wavelength channel and switch port optimization as well as resource allocation to sustain dynamic traffic, has become a challenging problem for dynamic WDM networks.…”

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confidence: 99%

Joint routing, link capacity dimensioning, and switch port optimization for dynamic traffic in optical networks

Khan

Khattak

et al. 2021

ETRI Journal

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This paper considers a challenging problem: to simultaneously optimize the cost and the quality of service in opaque wavelength division multiplexing (WDM) networks. An optimization problem is proposed that takes the information including network topology, traffic between end nodes, and the target level of congestion at each link/ node in WDM networks. The outputs of this problem include routing, link channel capacities, and the optimum number of switch ports locally added/dropped at all switch nodes. The total network cost is reduced to maintain a minimum congestion level on all links, which provides an efficient trade-off solution for the network design problem. The optimal information is utilized for dynamic traffic in WDM networks, which is shown to achieve the desired performance with the guaranteed quality of service in different networks. It was found that for an average link blocking probability equal to 0.015, the proposed model achieves a net channel gain in terms of wavelength channels ( 𝛾 w ) equal to 35.72 % , 39.09 % , and 36.93 % compared to shortest path first routing and 𝛾 w equal to 29.41 % , 37.35 % , and 27.47 % compared to alternate routing in three different networks.

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Dimensioning WDM Networks for Dynamic Routing of Evolving Traffic

Cited by 11 publications

References 36 publications

A Fault-Tolerance Solution to Any Set of Failure Scenarios on Dynamic WDM Optical Networks With Wavelength Continuity Constraints

A Fault-Tolerance Solution to Any Set of Failure Scenarios on Dynamic WDM Optical Networks With Wavelength Continuity Constraints

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

Joint routing, link capacity dimensioning, and switch port optimization for dynamic traffic in optical networks

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