D.A. Schupke

Nokia Siemens Networks, Esbo, Southern Finland Province, Finland

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Publications (122)38.26 Total impact

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    ABSTRACT: Due to the independent operation of cloud infrastructures and communication networks, global cloud services face limitations in the end-to-end quality of experience (QoE). Network virtualization enables end-to-end QoE by combining the control of network and cloud resources. In a network-virtualization architecture involving different business roles, there are two important questions: how to design an end-to-end resilient virtual network for cloud services given the service requests and the available resources of the physical layer, and at which layer to provision resilience. The existing literature on virtual network design usually lacks the separation of the business roles and the corresponding layers, and hence, cannot offer an answer to these questions. In this invited paper, we address both questions by proposing novel resilient virtual network design models for flexible and cost-efficient virtual networks having resilience either at the virtual or the physical layer, or using a combination of both, and by analyzing the performance of the proposed resilience alternatives both via analysis and extensive simulations.
    Journal of Optical Communications and Networking. 02/2015; 7(2).
  • Dominic Schupke, Burcu Barla, Marco Hoffmann
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    ABSTRACT: Future highly-reliable cloud and network services demand for survivability architectures covering network and IT infrastructures. We propose corresponding design models and evaluate them.
    Optical Fiber Communication Conference; 03/2014
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    ABSTRACT: As guest editors for this Special Issue of the IEEE/OSA JOURNAL OF LIGHTWAVE TECHNOLOGY (JLT), we are pleased to present a broad selection of the important contributions to OFC/NFOEC 2013, which took place in March in Anaheim, CA, USA. This special issue documents the state of the art in optical fiber technology and networks in greater depth than is possible in the limited format of the conference technical digest. To capture a broad range of subjects, we invited all authors of accepted post-deadline papers and all tutorial presenters to submit a contribution to this Special Issue. We encouraged all authors to augment their papers by including more detail and additional content. All submissions underwent the standard peerreview process of JLT assuring expected accuracy, completeness, and polished presentation.
    Journal of Lightwave Technology 01/2014; 32(4). · 2.56 Impact Factor
  • I.B. Barla, D.A. Schupke, M. Hoffmann, G. Carle
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    ABSTRACT: Currently, accessing global cloud services has its limitations in end-to-end quality of experience (QoE) due to the independent operation of cloud infrastructures and communication networks. The novel virtual network design approaches for resilient cloud services that are presented in this paper can realize end-to-end availability and latency guarantees by combining the control of network and cloud resources. We formulate design models as linear optimization problems to realize resilience either at the virtual or the physical layer. On the basis of extensive simulations, we analyze the effect on the overall performance when cost factors and influential parameters of the network virtualization environment are varied. We compare the proposed models in detail and show that they outperform prior approaches. Finally, we provide a discussion about the implementation and applicability of the proposed models.
    Design of Reliable Communication Networks (DRCN), 2013 9th International Conference on the; 01/2013
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    ABSTRACT: We provide optimal virtual network design models with protection against various physical and virtual failures. Our models enable protection against single link, node and sub-network failures with almost the same cost using an intelligent design.
    Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC), 2013; 01/2013
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    ABSTRACT: Mixed-line-rate optical networks allow for a more resource-efficient handling of small and large traffic volumes. In this work, we extend this flexibility by adapting Γ-robust optimization to deal with demand uncertainty.
    Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC), 2013; 01/2013
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    ABSTRACT: Network virtualization is regarded as a promising concept solving the Internet ossification problem for the future Internet and as a method to provision well-framed cloud services. Providing resilience continues to be a key issue for future networks due to the high service requirements, growing data volumes, and the dependency of businesses and society on cloud services. We propose a novel architecture allowing the request of a complete resilient virtual network and - if necessary after its creation - sharing of its parts with existing virtual networks. As a proof of concept, we design networks using shared protection that can be optionally provisioned either at the virtual or at the physical layer and perform simulations. Our results show that shared protection models outperform the dedicated protection models with a reduction of the virtual network setup cost of up to 22% and of the required physical network capacity of up to 70% for the used topology and parameters. Moreover, for certain cost settings having resilience in the virtual layer brings a cost benefit of up to 83%. However, having resilience in the physical layer results always in a lower delay, number of virtual links and a higher network utilization efficiency.
    Communications Workshops (ICC), 2013 IEEE International Conference on; 01/2013
  • Isil Burcu Barla, Dominic A. Schupke, Georg Carle
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    ABSTRACT: Network virtualization with combined control of network and IT resources enables network designs for end-to-end cloud services with latency and availability guarantees. Even though providing such QoE guarantees is of high importance for cloud services, it is mostly not possible today if the services traverse different domains. To addresses this problem, firstly, we introduce novel resilient design methods for virtual networks minimizing the cost or the latency of the virtual network. We realize the routing of the services and the mapping of the virtual network simultaneously. Secondly, we provide two fundamental cloud connection architectures, which provide end-to-end resilience for cloud services in the presence of both network and datacenter failures. Using extensive simulations, we evaluate the performance of the proposed architectures in terms of cost of the virtual networks and maximum end-to-end delay that they can guarantee for cloud services.
    Proceedings of the 11th international IFIP TC 6 conference on Networking - Volume Part I; 05/2012
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    ABSTRACT: The shared backup router resources (SBRR) homing architecture leads to significant cost reductions compared to dual homing. We propose a novel heuristic approach and evaluate its performance for different network topologies and varying traffic demand.
    03/2012;
  • I.B. Barla, D.A. Schupke, G. Carle
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    ABSTRACT: Network virtualization is seen as a promising concept for the future Internet. It offers high efficiency and flexibility, and is a good candidate to address the ossification of the Internet. It is also a key enabler for resilient and low latency cloud services. Network virtualization is also expected to give rise to new business roles. Therefore, these business roles, their responsibilities and their interactions should be deeply analysed. Understanding the effects of design decisions and parameter settings in a virtual network ecosystem can be achieved by modelling and simulation. In this paper, we introduce a new simulation environment, in which a network virtualization ecosystem with its all players and the infrastructures they possess can be modelled, and the performance of new designs for efficient and resilient virtual networks and cloud connections can be assessed.
    Computer Modelling and Simulation (UKSim), 2012 UKSim 14th International Conference on; 01/2012
  • I.B. Barla, D.A. Schupke, G. Carle
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    ABSTRACT: Even though both delay and availability are of high importance for cloud services, it is mostly impossible today to guarantee a certain latency and availability for end-to-end cloud services traversing the telecommunication networks. An enabler is network virtualization with isolated virtual networks and combined control for network and IT resources. In this paper, we introduce two fundamental architectural alternatives in resilience design for cloud services using virtual networks, where in the former, resilience is provided solely by the physical infrastructure provider and in the latter only by the virtual network operator. We show that the resilience design plays a key role in terms of latency of the cloud services. Our simulation results show that the guaranteed maximum delay for the cloud services can differ by more than 90% depending on the implemented resilience design. This can have a big impact on the service performance in large networks especially for today's applications, where each millisecond might count.
    Parallel and Distributed Processing with Applications (ISPA), 2012 IEEE 10th International Symposium on; 01/2012
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    ABSTRACT: The six invited tutorials and 25 regular papers in this special issue are expanded versions of papers presented at the Optical Fiber Communication Conference and Exposition (OFC) and the National Fiber Optic Engineers Conference (NFOEC) 2011, which took place in March 2011 in Los Angeles, CA.
    Journal of Lightwave Technology 01/2012; 30(4):381-383. · 2.56 Impact Factor
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    ABSTRACT: Ethernet's success in local area networks (LANs) is fueling the efforts to extend its reach to cover metro and long-haul networks. This new Ethernet is refereed to as Carrier Ethernet. Among the various transport infrastructures for realizing Carrier Ethernet, wavelength-division multiplexing (WDM) optical network is a strong candidate for this purpose. Optical transmission rates per channel are increasing from 10 to 40 Gb/s and even 100 Gb/s, and they can also coexist in the same fiber. Along with the flexibility associated with such a network with mixed-line rates (MLR), signal-related constraints at high rates become a challenge for cost-efficient routing. Among these issues is the maximum nonregenerated optical distance that a signal can travel before its quality degrades or maximum transmission range (TR). TR is rate-dependent: The higher the rate, the shorter the range. While high-rate pipes may require signal regeneration to restore the signal's quality, they support more traffic and, hence, can save resources. We study the problem of cost-efficient routing of multi-bit-rate (1/10/40/100 Gb/s) Ethernet tunnels using MLR over a carrier's WDM optical network with signal-transmission-range constraints. We studied the effect of TR for mixed-rate signals (10/40/100 Gb/s) on the network's cost to determine the optimal TR of each bit rate. We present an analytical model based on a mixed-integer linear program (MILP) to determine the optimal TR of a small network. Since MILP has scalability constraints that makes it hard or sometimes impossible to solve for real network topologies, we propose a graph-based solution that constructs a mixed-line-rate auxiliary (MLR-AUX) graph to capture the network's heterogeneity and a weight-assignment approach that allows the routing to be cost-efficient. Our algorithms were tested on a U.S. nationwide network topology. We found that it is possible to reduce the network's cost by using short TR and that the optimal TR depends - - strongly on traffic characteristics and on the TR values of different bit-rate signals.
    IEEE/ACM Transactions on Networking 11/2011; · 2.01 Impact Factor
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    C. Kronberger, T. Schondienst, D.A. Schupke
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    ABSTRACT: For long-term operated networks, pre-planning is a challenging task due to uncertainty in future demand requests. In this paper we first address the question of how severe the impact of demand uncertainty on the network costs really is. Results indicate that only for special cases, uncertainty is interesting to be addressed in the planning process itself. Additionally, we introduce a Stochastic Programming model in order to handle the influence of such a special case. It can be observed that including an improbable demand development into the planning process leads to cost efficient network solutions for all considered scenarios.
    Communications (ICC), 2011 IEEE International Conference on; 07/2011
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    E. Palkopoulou, D.A. Schupke, T. Bauschert
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    ABSTRACT: Significant cost reductions can be achieved through the deployment of alternative homing architectures. These reductions, however, come at the expense of increased recovery time. In this paper we focus on the dual homing with shared backup router resources (SBRR) architecture and propose an analytical recovery time model based on GMPLS signaling. Case studies are presented showing recovery times ranging from 100 ms to around 2500 ms. Simultaneously, the dominating time contributing factors are identified, while the impact of varying parameters such as the network edge length is quantified. We proceed to show how service-imposed maximum outage requirements have a direct effect on the configuration of the SBRR architecture.
    Communications (ICC), 2011 IEEE International Conference on; 07/2011
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    I.B. Barla, F. Rambach, D.A. Schupke, G. Carle
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    ABSTRACT: Quality of service requirements and the increasing amount of data transmission demand for efficient protection mechanisms. Existing mechanisms like 1+1 and 1+N path protection offer instantaneous recovery but they suffer from high capacity needs and nodal degree requirements, respectively. The high nodal degree requirement makes an implementation of the 1+N mechanism in transport networks difficult. In this paper, we develop two new mechanisms by applying network coding on a virtualized protection scheme. These mechanisms are more resource-efficient compared to 1+1, and are implementable in transport networks even under stringent nodal degree constraints. The difference between the two mechanisms lies in complexity and performance. Therefore, either of them can be preferred as a good compromise between 1+1 and 1+N in different scenarios according to the needs and available resources.
    Global Telecommunications Conference (GLOBECOM 2010), 2010 IEEE; 01/2011
  • D. A. Schupke, F. Rambach
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    ABSTRACT: We highlight Path Computation Element (PCE) enabled multi-layer and multi-domain architectures for global-scale network automation. The alternatives are discussed using different deployment strategies.
    01/2011;
  • Eleni Palkopoulou, Dominic A. Schupke, Thomas Bauschert
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    ABSTRACT: Alternative homing architectures can lead to significant cost reductions. These reductions are quantified using linear programming under a multi-layer consideration. In this study we focus on savings with respect to network equipment capital expenditures (CAPEX) achieved by transitioning to different homing architectures in an IP over optical data unit (ODU) setting. The impact of traffic demand is examined for different reference networks. In all conducted case studies we find that network equipment costs follow an approximately linear relationship with the traffic demand. Additionally, case study results assuming up to an aggressive 50% cost decrease in IP layer equipment, quantify the impact of variations in the cost of network elements.
    Telecommunication Systems 01/2011; · 1.03 Impact Factor
  • Eleni Palkopoulou, Dominic A. Schupke, Thomas Bauschert
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    ABSTRACT: The emergence of multilayer networking capabilities opens the path for the deployment of advanced network architectures and resilience concepts. In this article we propose a novel resource-efficient homing scheme we call dual homing with shared backup router resources (SBRR). As the scheme realizes shared routerlevel redundancy with the help of dynamic circuit-switched services, it can achieve significantly lower network costs than today’s dual homing architectures. We focus on the discussion of operational aspects related to control plane functions and the evaluation of cost savings. In addition, we address further issues such as the impact of the new homing architecture on the end-to-end connection availability and energy efficiency.
    IEEE Communications Magazine 01/2011; 49:140-146. · 3.66 Impact Factor
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    Isil Burcu Barla, Dominic A Schupke, Georg Carle
    01/2011;

Publication Stats

959 Citations
38.26 Total Impact Points

Institutions

  • 2008–2012
    • Nokia Siemens Networks
      Esbo, Southern Finland Province, Finland
  • 2001–2011
    • Technische Universität München
      • Department of Communication Networks
      München, Bavaria, Germany
  • 2007–2008
    • University of California, Davis
      • Department of Computer Science
      Davis, California, United States
    • Christopher Newport University
      Newport News, Virginia, United States
  • 2004–2007
    • Siemens
      München, Bavaria, Germany
  • 2005
    • University of Campinas
      Conceição de Campinas, São Paulo, Brazil