Differentiated QoS routing of restorable sub-lambda connections in IP-over-WDM networks using a multi-layer protection approach

Ratnam, Krishanthmohan; Gurusamy, Mohan; Zhou, Lihua

doi:10.1109/icbn.2005.1589608

Cited by 9 publications

(4 citation statements)

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“…In [7], multilayer methods for survivability are compared in terms of resource utilization and configuration costs. Zhu et al [8] investigates IP-over-WDM protection with differentiated services and intelligent sharing of backup resources to optimize network utilization. Rai et al [9] proposes to protect two high QoS classes at the optical layer and a third lower-priority class is served with best-effort quality at the IP layer.…”

Section: Related Work and Backgroundmentioning

confidence: 99%

“…Hence, the SP should be able to provide different levels of protection, according to the required availability level, and manage its resources while pursuing the twofold goal to avoid penalties and to increase the profit, i.e., maximizing the number of connections (or bandwidth) provisioned. Multilayer protection techniques supporting differentiated services have also been proposed to achieve this goal [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Multilayer Protection with Availability Guarantees in Optical WDM Networks

et al. 2011

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Survivability is a key concern in modern network design. This paper investigates the problem of survivable dynamic connection provisioning in general telecom backbone networks, that are mesh structured. We assume differentiated services where connections may have different availability requirements, so they may be provisioned differently with protection (if needed) based on their availability requirements and current network state. The problem of effectively provisioning differentiated-service requests, that has been widely investigated for connections routed at the physical layer, assumes peculiar features if we consider sub-wavelength requests at the logical layer that have to be protected (or more generically, whose availability target has to be guaranteed), but also have to be groomed for an efficient use of network resources. An integrated multilayer approach is necessary that considers requirements and grooming of connections at the logical layer as well as their routing and availability at the physical layer. Joint availability-guaranteed routing and traffic grooming may lead to a negative interaction, since the objective of the first problem (guaranteeing a given level of availability to the connections) clashes with the objective of the other problem (minimizing resource consumption). For a multilayer WDM mesh network, we propose new multilayer routing strategies that perform effective availabilityguaranteed grooming of sub-wavelength connections. These strategies jointly

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Section: Related Work and Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multilayer Protection with Availability Guarantees in Optical WDM Networks

et al. 2011

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“…Cheng et al (2014) proposed a three-layered model to analyse and recognise the activities of a group of people, where the type of interactions is used to distinguish layers. This is similar to the idea of Ratnam et al (2005), where layers are divided according to the degree of protection demand in different IT applications. Interesting are also the layered models, which are intended to capture the state of an area, e.g., in result of heavy gas dispersion (Hankin, Britter 1999).…”

Section: Layers In Maintenance Modellingmentioning

confidence: 91%

Maintenance Layers for Railway Infrastructure in Poland

2021

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The railway network in Poland with over 19000 km is one of the biggest in the European Union (EU). At the same time safety indicators collected by the European Union Agency for Railways (ERA) show that it is one of the least safe in Europe. Consequently, all the actions taken in safety management of Polish Railways are particularly important for the society. In 2015, there was a change in the main infrastructure manager’s rulebook on track maintenance. A new process rule was introduced to replace a large set of long-established action rules. However, supervision reports of the Polish National Safety Authority indicate that the new rule is not used properly. Therefore, the current process of taking maintenance decisions on Polish Railways was described and a novel concept of maintenance layers and Maintenance Board meetings was proposed. The change would allow to choose the order of maintenance activities in a more objective way than it is done nowadays, without the necessity to make any major investments.

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“…Provisioning according to a service level agreement (SLA), which represents the contract of availability between a service provider and its client, was proposed in [3]. In Internet protocol (IP) over wavelength division multiplexing (WDM) networks, considering both differentiated survivability services and transmission quality, four service classes were defined: optical layer dedicated protection, optical layer shared protection, IF/multi-protocol label switching (MPLS) layer shared protection, and no-protection [4]. On the other hand, to accommodate paths more efficiently, network reconfigu ration and reoptimization represent promising candidates for quasi-dynamic and multi-granularity traffic [5].…”

Section: Introductionmentioning

confidence: 99%