Publikationen


Suche nach „[Fischer] [Andreas]“ hat 46 Publikationen gefunden
Suchergebnis als PDF
    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Fischer, J. Botero, Michael Beck, H. Meer, X. Hesselbach

    Virtual Network Embedding: A Survey

    IEEE Communications Surveys and Tutorials, vol. 15, no. 4, pp. 1888-1906

    2013

    DOI: 10.1109/SURV.2013.013013.00155

    Abstract anzeigen

    Network virtualization is recognized as an enabling technology for the future Internet. It aims to overcome the resistance of the current Internet to architectural change. Application of this technology relies on algorithms that can instantiate virtualized networks on a substrate infrastructure, optimizing the layout for service-relevant metrics. This class of algorithms is commonly known as “Virtual Network Embedding (VNE)” algorithms. This paper presents a survey of current research in the VNE area. Based upon a novel classification scheme for VNE algorithms a taxonomy of current approaches to the VNE problem is provided and opportunities for further research are discussed.

    Elektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Berl, M. Niedermeier, Andreas Fischer, D. Hutchinson, H. Meer

    Virtual Energy Information Network: A Resilience Perspective

    e&i Elektrotechnik & Informationstechnik (Special Issue on ’Smart Grid and Security’), vol. 130, no. 4-5, pp. 121-126

    2013

    Abstract anzeigen

    Increasing demand in energy consumption, missed modernisations, and the increasing difficulties in predicting power production due to volatile renewable energy sources (e.g., based on wind or sun) impose major challenges to the power grid. Power supply and power demand are closely interconnected with the need to maintain the power grid in a stable state with a sufficient quality of power. This requires energy-relevant information to be exchanged through the so called Energy Information Network. Communication, however, is challenging within the Energy Information Network due to privacy, security, resiliency, and quality-of-service requirements. Particularly, the resilience of communication within the Energy Information Network needs to be considered to maintain the power grid in a stable and controlled state. This paper suggests a Virtualised Energy Information Network (VEIN), where the Energy Information Network is divided into multiple virtual networks that run over a common substrate network. Furthermore, this paper discusses benefits of this approach in terms of privacy, security, and resilience and points out open research questions.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    M. Beck, Andreas Fischer, H. Meer

    Distributed Virtual Network Embedding

    Proceedings of the 7th GI/ITG KuVS Workshop on Future Internet

    2012

    Abstract anzeigen

    Network virtualization applies virtualization concepts to network resources in order to provide an abstraction from specific hardware. The added flexibility manifests itself in the possibility to create arbitrarily structured virtual networks that do not necessarily have to reflect the topology or the properties of the underlying physical network. The problem of mapping virtual resources to physical resources in such an environment is commonly known as ,,Virtual Network Embedding”, and almost all existing embedding algorithms do this in a centralized manner. The exploitation of distributed approaches aims to improve performance and to increase the level of reliability: stability and scalability of the whole system should be ensured. In this work, we present our ideas how to build such a new approach.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    G. Marias, J. Barros, M. Fiedler, Andreas Fischer, H. Hauff, R. Herkenhoener, A. Grillo, A. Lentini, L. Lima, C. Lorentzen, W. Mazurczyk, H. Meer, P. Oliveira, G. Polyzos, E. Pujol, K. Szczypiorski, J. Vilela, T.T.V. Vinhoza

    Security and Privacy issues for the Network of the Future

    Security and Communication Networks, vol. 5, no. 9, pp. 987-1005

    2012

    DOI: 10.1002/sec.384

    Abstract anzeigen

    The vision towards the Network of the Future cannot be separated from the fact that today’s networks, and networking services are subject to sophisticated and very effective attacks. When these attacks first appeared, spoofing and distributed denial-of-service attacks were treated as apocalypse for networking. Now, they are considered moderate damage, whereas more sophisticated and inconspicuous attacks, such as botnets activities, might have greater and far reaching impact. As the Internet is expanding to mobile phones and ‘smart dust’ and as its social coverage is liberalized towards the realization of ubiquitous computing (with communication), the concerns on security and privacy have become deeper and the problems more challenging than ever. Re-designing the Internet as the Network of the Future is self-motivating for researchers, and security and privacy cannot be provided again as separate, external, add-on, solutions. In this paper, we discuss the security and privacy challenges of the Network of the Future and try to delimit the solutions space on the basis of emerging techniques. We also review methods that help the quantification of security and privacy in an effort to provide a more systematic and quantitative treatment of the area in the future.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    J. Botero, X. Hesselbach, Andreas Fischer, H. Meer

    Optimal mapping of virtual networks with hidden hops

    Telecommunications Systems: Special Issue on Future Internet Services and Architectures (Trends and Visions), vol. 51, no. 4, pp. 273-282

    2012

    DOI: 10.1007/s11235-011-9437-0

    Abstract anzeigen

    Network Virtualization has emerged as a so-lution for the Internet inability to address the requiredchallenges caused by the lack of coordination amongInternet service providers for the deployment of newservices. The allocation of resources is one of the mainproblems in network virtualization, mainly in the map-ping of virtual nodes and links to specific substratenodes and paths, also known as the virtual networkembedding problem. This paper proposes an algorithmbased on optimization theory, to map the virtual linksand nodes requiring a specific demand, looking for themaximization of the spare bandwidth and spare CPUin the substrate network, taking into account the band-width demanded by thehidden hopswhen a virtuallink is mapped. The components of the virtual networks(nodes and links) that do not ask for an specific demandare then allocated following a fairness criteria.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    J. Botero, X. Hesselbach, M. Duelli, D. Schlosser, Andreas Fischer, H. Meer

    Energy Efficient Virtual Network Embedding

    IEEE Communications Letters, vol. 16, no. 5, pp. 756-759

    2012

    DOI: 10.1109/LCOMM.2012.030912.120082

    Abstract anzeigen

    Waste of energy due to over-provisioning and overdimensioning of network infrastructures has recently stimulated the interest on energy consumption reduction by Internet Service Providers (ISPs). By means of resource consolidation, network virtualization based architectures will enable energy saving. In this letter, we extend the well-known virtual network embedding problem (VNE) to energy awareness and propose a mixed integer program (MIP) which provides optimal energy efficient embeddings. Simulation results show the energy gains of the proposed MIP over the existing cost-based VNE approach.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    G. Polyzos, G. Marias, S. Arkoulis, P. Frangoudis, M. Fiedler, A. Popescu, H. Meer, R. Herkenhoener, Andreas Fischer, J. Oberender

    ASPECTS: Agile Spectrum Security

    Proceedings of the 7th Euro-NF Conference on Next-Generation Internet (NGI 2011) [Kaiserslautern; June 27-29, 2011]

    2011

    DOI: 10.1109/NGI.2011.5985872

    Abstract anzeigen

    The ASPECTS project considered an underlying dynamic spectrum access radio network, spectrum sensing technology and techniques, and spectrum sharing policies and rules and addressed vulnerabilities in all spectrum sharing phases, i.e. spectrum monitoring, negotiation, dissemination of access rules and sharing implementation. In the following sections, we describe our research objectives and our approach towards attaining them, present the main outcome of ASPECTS and conclude with a discussion on the relevance of our project to the Euro-NF vision towards the Future Internet.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    A. Galis, S. Clayman, L. Lefevre, Andreas Fischer, H. Meer, J. Rubio-Loyola, J. Serrat, S. Davy

    Towards In-Network Clouds in Future Internet

    The Future Internet

    2011

    ISBN: 978-3-642-20897-3

    DOI: 10.1007/978-3-642-20898-0_2

    Abstract anzeigen

    One of the key aspect fundamentally missing from the current Internet infrastructure is an advanced service networking platform and facilities, which take advantage of flexible sharing of available connectivity, computation, and storage resources. This paper aims to explore the architectural co-existence of new and legacy services and networks, via virtualisation of connectivity and computation resources and self-management capabilities, by fully integrating networking with cloud computing in order to create In-Network Clouds. It also presents the designs and experiments with a number of In-Network Clouds platforms, which have the aim to create a flexible environment for autonomic deployment and management of virtual networks and services as experimented with and validated on large-scale testbeds.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    Andreas Fischer, A. Fessi, G. Carle, H. Meer

    Wide-Area Virtual Machine Migration as Resilience Mechanism

    Proceedings of the 1st International Workshop on Network Resilience: From Research to Practice (WNR 2011) [Madrid, Spain; October 4, 2011]

    2011

    ISBN: 978-1-4577-1624-9

    DOI: 10.1109/SRDSW.2011.16

    Abstract anzeigen

    The resilience of services in the Internet has become an important issue and is expected to become even more important in the future. Virtualization is one of the means which can be deployed for resilience purposes. In this paper we follow a systematic approach to the use of virtualization to increase the resilience of network services. First, we provide an analysis of the potential failures of services running within Virtual Machines (VM) and how VM migration or replication can be used to address these failures. Then, we address the problem of re-establishing connectivity between a service and its clients upon successful migration, by leveraging results from mobility research. A special focus is given to wide-area VM migration, since it is considered as the solution for some difficult failures, e.g., large-scale failures due to natural disasters.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    M. Duelli, D. Schlosser, J. Botero, X. Hesselbach, Andreas Fischer, H. Meer

    VNREAL: Virtual Network Resource Embedding Algorithms in the Framework ALEVIN

    Proceedings of the 7th Euro-NF Conference on Next-Generation Internet (NGI 2011) [Kaiserslautern; June 27-29, 2011]

    2011

    DOI: 10.1109/NGI.2011.5985874

    Abstract anzeigen

    Network virtualization is recognized as an enabling technology for the Future Internet that overcomes network ossification. However, it introduces a set of challenges. In any network virtualization environment, the problem of optimally mapping virtual resources to physical resources, known as virtual network embedding (VNE), is a critical challenge. Several algorithms attempting to solve this problem have been proposed in literature, so far. However, comparison of existing and new VNE algorithms is hard, as each algorithm focuses on different criteria. To that end, the VNREAL project introduces ALEVIN, a framework to compare different algorithms according to a set of metrics, easily incorporate new VNE algorithms, and evaluate these algorithms on a given scenario for arbitrary parameters.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    J. Botero, X. Hesselbach, M. Duelli, D. Schlosser, Andreas Fischer, H. Meer

    Flexible VNE Algorithms Analysis using ALEVIN

    Proceedings of the 11th Würzburg Workshop on IP: Joint ITG and Euro-NF Workshop "Visions of Future Generation Networks" (EuroView2011)

    2011

    Abstract anzeigen

    Network virtualization is recognized as an enabling technology for the Future Internet that overcomes network ossification. However, it introduces a set of challenges. In any network virtualization environment, the problem of optimally mapping virtual demands to physical resources, known as virtual network embedding (VNE), is a crucial challenge. This paper analyses the behaviour of the main algorithms proposed to solve VNE by means of the ALEVIN framework. The VNE algorithms are evaluated with regard to appropriate metrics such as: cost, revenue, and virtual network acceptance ratio. We also analyse the impact of the recently introduced hidden hop demand concept in the performance of the VNE algorithms.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    J. Rubio-Loyola, A. Galis, A. Astorga, J. Serrat, L. Lefevre, Andreas Fischer, A. Paler, H. Meer

    Scalable Service Deployment on Software Defined Networks

    IEEE Communications Magazine, vol. 49, no. 12, pp. 84-93

    2011

    DOI: 10.1109/MCOM.2011.6094010

    Abstract anzeigen

    The network of the future will require a greater degree of service-awareness, and an optimal use of network resources. This paper presents the architectural design developed in the AutoI project for an open software-defined network infrastructure that enables the composition of fast and guaranteed services in an efficient manner and the execution of these services in an adaptive way taking into account better shared network resources provided by network virtualisation. Validation results are provided with special emphasis on service deployment scalability over virtualized network infrastructures.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    A. Paler, Andreas Fischer

    vCPI – virtual Component Programming Interface

    Praxis der Informationsverarbeitung und Kommunikation, vol. 34, no. 3, pp. 142-143

    2011

    DOI: 10.1515/piko.2011.028

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Fischer, Hermann Meer

    Position Paper: Secure Virtual Network Embedding

    Praxis der Informationsverarbeitung und Kommunikation, vol. 34, no. 4, pp. 190-193

    2011

    DOI: 10.1515/piko.2011.040

    Abstract anzeigen

    Network virtualization has been recognized as an important technique to overcome the perceived ossification of the current Internet. Several variations of network virtualization have already been discussed in the literature. These approaches use virtualization to partition and/or combine physical network resources into virtual network resources. An actual deployment of virtual networks then requires the network operator to perform a mapping of virtual resources onto physical resources. The question of how this mapping can be performed in an optimal way is commonly known as the Virtual Network Embedding (VNE) problem. Several algorithms to solve this problem have been proposed already. These algorithms, however, focus on optimizing the use of resources with regard to performance. Security constraints to the VNE problem have not been investigated in depth, so far.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Fischer, J. Botero, M. Duelli, D. Schlosser, X. Hesselbach, H. Meer, T. Margaria, J. Padberg, G. Taentzer, H. Hellbrück, N. Luttenberger, V. Turau

    ALEVIN - A Framework to Develop, Compare, and Analyze Virtual Network Embedding Algorithms

    Electronic Communications of the EASST, vol. 37, pp. 1-12

    2011

    Abstract anzeigen

    Network virtualization is recognized as an enabling technology for the Future Internet. Applying virtualization of network resources leads to the problem of mapping virtual resources to physical resources, known as “Virtual Network Embedding” (VNE). Several algorithms attempting to solve this problem have been discussed in the literature, so far. However, comparison of VNE algorithms is hard, as each algorithm focuses on different criteria. To that end, we introduce a framework to compare different algorithms according to a set of metrics, which allow to evaluate the algorithms and compute their results on a given scenario for arbitrary parameters.

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    J. Rubio-Loyola, A. Astorga, J. Serrat, L. Lefevre, A. Cheniour, D. Muldowney, S. Davy, A. Galis, L. Mamatas, S. Clayman, D. Macedo, Z. Movahedi, G. Pujolle, Andreas Fischer, H. Meer

    Managability of Future Internet Networks from a Practical Viewpoint

    Towards the Future Internet - Emerging Trends from European Research

    2010

    ISBN: 978-1-60750-538-9

    DOI: 10.3233/978-1-60750-539-6-105

    DigitalElektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    J. Rubio-Loyola, A. Astorga, J. Serrat, W. Chai, L. Mamatas, A. Galis, S. Clayman, A. Cheniour, L. Lefevre, O. Mornard, Andreas Fischer, A. Paler, H. Meer

    Platforms and Software Systems for an Autonomic Internet

    Proceedings of the IEEE Global Communications Conference (IEEE GLOBECOM 2010) [Miami, FL, USA; December 6-10, 2010]

    2010

    ISBN: 978-1-4244-5636-9

    DOI: 10.1109/GLOCOM.2010.5683380

    Abstract anzeigen

    The current Internet does not enable easy introduction and deployment of new network technologies and services. This paper aims to progress the Future Internet (FI) by introduction of a service composition and execution environment that re-use existing components of access and core networks. This paper presents essential service-centric platforms and software systems that have been developed with the aim to create a flexible environment for an Autonomic Internet.

    DigitalElektrotechnik und Medientechnik

    Zeitschriftenartikel

    Andreas Berl, Andreas Fischer, H. Meer

    Virtualisierung im Future Internet - Virtualisierungsmethoden und Anwendungen

    Informatik-Spektrum, vol. 33, no. 2, pp. 186-194

    2010

    DOI: 10.1007/s00287-010-0420-z

    Abstract anzeigen

    Das Future Internet stellt sich der Herausforderung, die Verknöcherung und die Unzulänglichkeiten des heutigen Internets zu überwinden. Es soll beispielsweise robust, zuverlässig und fehlertolerant sein und dabei Dienste auf energieeffiziente Weise erbringen. Zusätzlich müssen auch neue Anforderungen antizipiert werden, die zukünftige Dienste und Netze stellen, um der Entwicklung von neuen Diensten und Protokollen nicht im Wege zu stehen. Erforderlich ist hierbei die Entwicklung einer äußerst variablen und rekonfigurierbaren Netzwerkarchitektur, die eine möglichst einfache und autonome Netzwerkverwaltung mit einschließt. Die Virtualisierung von Host- und Netzwerkressourcen stellt in diesem Zusammenhang eine der Schlüsseltechnologien dar, mit der diese notwendige Flexibilität erreicht werden kann. Virtualisierung verbirgt die Komplexität von physikalischen Netzwerkinfrastrukturen und stellt homogene, flexible und dynamisch rekonfigurierbare virtuelle Ressourcen zur Verfügung. Dieser Artikel gibt einen Überblick über verschiedene Host- und Netzwerkvirtualisierungsmethoden. An mehreren Beispielen wird aufgezeigt, wie verschiedene Herausforderungen angegangen werden können, die sowohl im heutigen Internet als auch im Internet der Zukunft eine Rolle spielen.

    Elektrotechnik und Medientechnik

    Vortrag

    G. Lovász, Andreas Fischer, H. Meer

    Network Virtualization and Energy Efficiency

    9th Würzburg Workshop on IP: Joint ITG and Euro-NF Workshop on Visions of Future Generations Networks (EuroView 2009), Würzburg, Germany

    2009

    Elektrotechnik und Medientechnik

    Beitrag (Sammelband oder Tagungsband)

    J. Rubio-Loyola, J. Serrat, A. Astorga, Andreas Fischer, Andreas Berl, H. Meer, G. Koumoutsos

    A Viewpoint of the Network Management Paradigm for Future Internet Networks

    Proceedings of the 1st IFIP/IEEE International Workshop on Management of the Future Internet (ManFI 2009)

    2009