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Fair Scheduling of Dynamically Provisioned WDM Connections with Differentiated Signal Quality
Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
Royal Institute of Technology (KTH), Stockholm, Sweden.
Royal Institute of Technology (KTH), Stockholm, Sweden.
2012 (English)In: Proceedings of the 16th International Conference on Optical Network Design and Modeling (ONDM), 2012, IEEE , 2012, 1-6 p.Conference paper, Published paper (Refereed)
Abstract [en]

Emerging, on-demand applications (e.g., Interactive video, ultra-high definition TV, backup storage and grid computing) are gaining momentum and are becoming increasingly important. Given the high bandwidth required by these applications, Wavelength Division Multiplexing (WDM) networks are seen as the natural choice for their transport technology. Among the various on-line strategies proposed to provision such services, the ones based on service level agreement (SLA) metrics such as setup delay tolerance and connection holding-time awareness showed a good potential in improving the overall network blocking performance. However, in a scenario where connection requests are grouped in different service classes, the provisioning success rate might be unbalanced towards those connection requests with less stringent requirements, i.e., not all the connection requests are treated in a fair way. This paper addresses the problem of how to guarantee the signal quality and the fair provisioning of different service classes, where each class corresponds to a specified target of quality of transmission (QoT). With this objective in mind three fair scheduling algorithms are proposed in a dynamic traffic scenario, each one combining in a different way the concept of both set-up delay tolerance and connection holding-time awareness. Proposed solutions are specifically taylored to facilitate the provisioning of the most stringent service class so as to balance the success rate among the different classes. Simulation results confirm that the proposed approaches are able to guarantee a fair treatment reaching up to 99% in terms of Jain's fairness index, considering the per-class success ratio, without compromising the improvements in terms of overall network blocking probability.

Place, publisher, year, edition, pages
IEEE , 2012. 1-6 p.
Keyword [en]
Bandwidth, Delay, Electronic mail, Optical fiber networks, Real time systems, Telemedicine, WDM networks
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-85544DOI: 10.1109/ONDM.2012.6210281ISBN: 978-1-4673-1441-1 (print)ISBN: 978-1-4673-1440-4 (print)OAI: oai:DiVA.org:liu-85544DiVA: diva2:571445
Conference
16th International Conference on Optical Network Design and Modeling (ONDM), 17-20 April, Colchester, UK
Available from: 2012-11-22 Created: 2012-11-22 Last updated: 2015-03-23Bibliographically approved
In thesis
1. Connections Provisioning Strategies for dynamic WDM networks
Open this publication in new window or tab >>Connections Provisioning Strategies for dynamic WDM networks
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The size, complexity, and the amount of traffic generation of optical communication networks have dramatically increased over the last decades. Exciting technologies, namely, optical amplifiers, wavelength division multiplexing (WDM) and optical filters have been included in optical networks, in order to fulfill end users appetite for bandwidth. However, the users high bandwidth demand will further increase with time, as emerging on-demand bandwidth intensive applications are starting to dominate the networks. Applications such as interactive video, ultra-high definition TV, backup storage, grid computing, e-science, e-health to mention a few, are becoming increasingly attractive and important for the community. Given the high bandwidth requirements and strict service level specifications (SLSs) of such applications, WDM networks equipped with agile devices, such as reconfigurable optical add-drop multiplexers and tunable transceivers integrated with G-MPLS/ASON control-plane technology are advocated as a natural choice for their implementation. SLSs are metrics of a service level agreement (SLA), which is a contract between a customer and network operator. Apart from other candidate parameters, the set-up delay tolerance and connection holding-time have been defined as metrics of SLA.

This work addresses the network connections provisioning problem for the above mentioned demanding applications, by exploiting the time dimension of connections request. The problem is investigated for dynamic networks comprising ideal and nonideal components in their physical layer, and for applications with differentiated set-up delay tolerance and quality of signal requirements. Various strategies for different scenarios are proposed, each strategy combining in a different way the concept of both set-up delay tolerance and connection holding-time awareness. The objectives of all these strategies are to enhance the network connections provisioning capability and to fulfill customers demand, by utilizing the network resources efficiently.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 38 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1557
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-84795 (URN)LIU-TEK-LIC-2012:42 (Local ID)978-91-7519-740-1 (ISBN)LIU-TEK-LIC-2012:42 (Archive number)LIU-TEK-LIC-2012:42 (OAI)
Presentation
2012-12-05, Signalen, Hus B, Campus Valla, Linköping University, Linköping, 10:30 (English)
Opponent
Supervisors
Available from: 2012-11-22 Created: 2012-10-22 Last updated: 2012-11-26Bibliographically approved
2. Planning and Provisioning Strategies for Optical Core Networks
Open this publication in new window or tab >>Planning and Provisioning Strategies for Optical Core Networks
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Optical communication networks are considered the main catalyst for the transformation of communication technology, and serve as the backbone of today's Internet. The inclusion of exciting technologies, such as, optical amplifiers, wavelength division multiplexing (WDM), and reconfigurable optical add/drop multiplexers (ROADM) in optical networks have made the cost of information transmission around the world negligible. However, to maintain the cost effectiveness for the growing bandwidth demand, facilitate faster provisioning, and provide richer sets of service functionality, optical networks must continue to evolve. With the proliferation of cloud computing the demand for a promptly responsive network has increased. Moreover, there are several applications, such as, real time multimedia services that can become realizable, depending on the achievable connection set-up time.

Given the high bandwidth requirements and strict service level specifications (SLSs) of such applications, dynamic on-demand WDM networks are advocated as a first step in this evolution. SLSs are metrics of a service level agreement (SLA), which is a contract between a customer and network operator. Apart from the other candidate parameters, the set-up delay tolerance, and connection holding-time have been defined as metrics of SLA. Exploiting these SLA parameters for on-line provisioning strategies exhibits a good potential in improving the overall network blocking performance. However, in a scenario where connection requests are grouped in different service classes, the provisioning success rate might be unbalanced towards those connection requests with less stringent requirements, i.e., not all the connection requests are treated in a fair way.

The first part of this thesis focuses on different scheduling strategies for promoting the requests belonging to smaller set-up delay tolerance service classes. The first part also addresses the problem of how to guarantee the signal quality and the fair provisioning of different service classes, where each class corresponds to a specified target of quality of transmission. Furthermore, for delay impatient applications the thesis proposes a provisioning approach, which employs the possibility to tolerate a slight degradation in quality of transmission during a small fraction of the holding-time.

The next essential phase for scaling system capacity and satisfying the diverse customer demands is the introduction of flexibility in the underlying technology. In this context, the new optical transport networks, namely elastic optical networks (EON) are considered as a worthwhile solution to efficiently utilize the available spectrum resources. Similarly, space division multiplexing (SDM) is envisaged as a promising technology for the capacity expansion of future networks. Among the alternative for flexible nodes, the architecture on demand (AoD) node has the capability to dynamically adapt its composition according to the switching and processing needs of the network traffic.

The second part of this thesis investigates the benefits of set-up delay tolerance for EON by proposing an optimization model for dynamic and concurrent connection provisioning. Furthermore, it also examines the planning aspect for flexible networks by presenting strategies that employ the adaptability inherent in AoD. Significant reduction in switching devices is attainable by proper planning schemes that synthesized the network by allocating switching device where and when needed while maximizing fiber switching operation. In addition, such a design approach also reduces the power consumption of the network. However, cost-efficient techniques in dynamic networks can deteriorate the network blocking probability owing to insufficient number of switching modules. For dynamic networks, the thesis proposes an effective synthesis provisioning scheme along with a technique for optimal placement of switching devices in the network nodes.

The network planning problem is further extended to multi-core-fiber (MCF) based SDM networks. The proposed strategies for SDM networks aim to establish the connections through proper allocation of spectrum and core while efficiently utilizing the spectrum resources. Finally, the optimal planning strategy for SDM networks is tailored to fit synthetic AoD based networks with the goal to optimally build each node and synthesize the whole network with minimum possible switching resources.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 84 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1645
National Category
Information Systems Computer and Information Science
Identifiers
urn:nbn:se:liu:diva-115908 (URN)10.3384/diss.diva-115908 (DOI)978-91-7519-115-7 (ISBN)
Public defence
2015-04-30, Signalen, Hus B, Campus Valla, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2015-03-23 Created: 2015-03-23 Last updated: 2015-03-26Bibliographically approved

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Muhammad, Ajmal

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Citation style
  • apa
  • harvard1
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  • modern-language-association-8th-edition
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  • Other style
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Language
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