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Connections Provisioning Strategies for dynamic WDM networks
Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
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: urn:nbn:se:liu:diva-84795Local ID: LIU-TEK-LIC-2012:42ISBN: 978-91-7519-740-1 (print)OAI: oai:DiVA.org:liu-84795DiVA: diva2:561890
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
List of papers
1. Effect of Delay Tolerance in WDM Networks with Differentiated Services
Open this publication in new window or tab >>Effect of Delay Tolerance in WDM Networks with Differentiated Services
2011 (English)In: Optical Fiber Communication Conference and Exposition (OFC/NFOEC), 2011 and the National Fiber Optic Engineers Conference, IEEE , 2011, 1-3 p.Conference paper, Published paper (Refereed)
Abstract [en]

We study a dynamic WDM network supporting different service classes (SC) containing applications having similar setup delay tolerance. By utilizing delay tolerance we propose scheduling strategies able to significantly reduce blocking probability of each SC.

Place, publisher, year, edition, pages
IEEE, 2011
Keyword
Bandwidth, Delay, Electronic mail, Optical fiber networks, Real time systems, Telemedicine, WDM networks
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85535 (URN)10.1364/NFOEC.2011.JWA056 (DOI)978-1-55752-906-0 (ISBN)
Conference
Optical Fiber Communication Conference and Exposition (OFC/NFOEC), 2011 and the National Fiber Optic Engineers Conference, 6-10 March, Los Angeles, CA, USA
Available from: 2012-11-22 Created: 2012-11-22 Last updated: 2014-10-21Bibliographically approved
2. Reducing Blocking Probability in Dynamic WDM Networks Using Different Schemes
Open this publication in new window or tab >>Reducing Blocking Probability in Dynamic WDM Networks Using Different Schemes
2011 (English)In: Proceedings 2011 International Conferenceon the Network of the Future, 28-30 November, 2011 Paris, France, IEEE , 2011, 97-101 p.Conference paper, Published paper (Refereed)
Abstract [en]

strategies. First we analyze a strategy which effectively utilizes two Service Level Agreement (SLA) metrics i.e. holding-time combined with set-up delay tolerance, for connection provisioning. We investigate its performance improvement compared to the scheme proposed in [4] and with the strategy which exploits only the set-up delay tolerance for connection provisioning. Secondly, we evaluate the performance of the various approaches for network blocking reduction over a wide range of network loads. Our aim is to obtain an insight information, that can be useful for selection of an optimal strategy for designing a network, with specific network parameters and performance requirements.

Place, publisher, year, edition, pages
IEEE, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85536 (URN)10.1109/NOF.2011.6126691 (DOI)978-1-4577-1605-8 (ISBN)
Conference
International Conference on the Network of the Future (NOF), 28-30 Nov, 2011, Paris, France
Available from: 2012-11-22 Created: 2012-11-22 Last updated: 2012-11-27
3. Reducing Blocking Probability in Dynamic WDM Networks by Rerouting and set-up Delay Tolerance
Open this publication in new window or tab >>Reducing Blocking Probability in Dynamic WDM Networks by Rerouting and set-up Delay Tolerance
2011 (English)In: 17th IEEE International Conference on Networks (ICON), 2011, IEEE , 2011, 195-200 p.Conference paper, Published paper (Refereed)
Abstract [en]

With the emergence of bandwidth intensive applications new methodologies need to be developed for improvement of network blocking performance, without supplying extra resources in dynamic wavelength-division-multiplexing (WDM) networks. Rerouting is one among the viable and cost-effective solutions to reduce the blocking probability (BP) of optical WDM networks. Similarly, set-up delay tolerance, a metric of service level agreement (SLA) has been exploited in [1]-[3] for improvement in network BP. In this paper, we study the rerouting in dynamic WDM network and analyze two different lightpath rerouting strategies. Moreover, we investigate further improvement in network BP by exploiting these rerouting techniques for network provisioned with set-up delay tolerance. Through extensive simulation studies, we confirm that the rerouting strategies decrease the BP substantially for network provisioned with set-up delay tolerance, even for smaller set-up delay tolerance value i.e. when the connection requests are impatient to wait for provisioning in the network. However, it also reduce BP significantly even when the network is not provisioned with set-up delay tolerance.

Place, publisher, year, edition, pages
IEEE, 2011
Series
IEEE International Conference on Networks, ISSN 1556-6463 ; 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85545 (URN)10.1109/ICON.2011.6168474 (DOI)978-1-4577-1824-3 (ISBN)
Conference
17th IEEE International Conference on Networks (ICON), 14-16 Dec., Singapore
Available from: 2012-11-22 Created: 2012-11-22 Last updated: 2012-11-22Bibliographically approved
4. Impairment-Aware Dynamic Provisioning in WDM Networks with set-up Delay Tolerance and Holding-time Awareness
Open this publication in new window or tab >>Impairment-Aware Dynamic Provisioning in WDM Networks with set-up Delay Tolerance and Holding-time Awareness
2011 (English)In: Proceedings of the 17th IEEE International Conference on Networks (ICON), 2011, IEEE , 2011, 213-218 p.Conference paper, Published paper (Refereed)
Abstract [en]

We study a dynamic WDM network with nonideal components in the physical layer which uses an impairment-aware routing and wavelength (RWA) algorithm for connection provisioning. We investigate the reduction in blocking probability (BP) by utilizing service Level Agreement (SLA) metric i.e. setup delay tolerance during connection provisioning. Furthermore, we explore the improvement in the network performance by efficiently utilizing the knowledge of the connections holding-time, another metric of SLA. Keeping in mind that BP reduction can be obtained by set-up delay tolerance [1] our focus is to investigate how set-up delay tolerance combined with holding-time awareness can improve BP performance caused by physical impairment. Our simulation results confirm that significant improvement can be achieved by holding-time aware connection provisioning compared to the unaware holding-time case. Moreover as expected, set-up delay tolerance can reduce BP even without knowledge of connections holding-time.

Place, publisher, year, edition, pages
IEEE, 2011
Series
IEEE International Conference on Networks, ISSN 1556-6463 ; 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85542 (URN)10.1109/ICON.2011.6168477 (DOI)978-1-4577-1824-3 (ISBN)
Conference
17th IEEE International Conference on Networks (ICON), 2011, 14-16 Dec., Singapore
Available from: 2012-11-22 Created: 2012-11-22 Last updated: 2012-11-27Bibliographically approved
5. Fair Scheduling of Dynamically Provisioned WDM Connections with Differentiated Signal Quality
Open this publication in new window or tab >>Fair Scheduling of Dynamically Provisioned WDM Connections with Differentiated Signal Quality
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
Keyword
Bandwidth, Delay, Electronic mail, Optical fiber networks, Real time systems, Telemedicine, WDM networks
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85544 (URN)10.1109/ONDM.2012.6210281 (DOI)978-1-4673-1441-1 (ISBN)978-1-4673-1440-4 (ISBN)
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

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Muhammad, Ajmal

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