Chair of Computer Networks and Computer Communications
New Trends in Network Architectures and Services, Mathematical Modeling

New Trends in Network Architectures and Services, Mathematical Modeling

DFG Project (Grants: 436 UNG 113/180/0-1, 436 UNG 113/197/0-1)

German-Hungarian Cooperation Project

Aims

Services in communication networks are evolving from multi-service networks to multi-network services. It can also be seen that edge-based services, like P2P, are getting more and more prominent. The impact of these trends on the stability and performance of different network architectures is a hot research topic. Network stability and performance are closely related to functional and stochastic scalability, where functional scalability is the measure if a system remains working if a huge mass of users are trying to use the service and stochastic scalability is the measure if a system still works if there is a high fluctuation of users.

Especially in P2P systems this fluctuation is very prominent and also referred to as churn rate. Currently, only few results based on mathematical modeling exist for edge-based services and, furthermore, new communication standards and network architectures are arising (e.g., WiMAX) where the impact of such new services on the scalability could not yet be investigated in detail.

With the proposed cooperation we would like to utilize the whole knowledge accumulated by the different participants. The research project aims at motivating and establishing integrated research into the tool support of performance analysis and optimization of next generation telecommunication systems. Our main aim is to know each other’s results obtained so far, further development of existing tools, and mathematical modeling of peer-to-peer, multimedia, and self-organizing telecommunication systems. 

Principle Investigator

Hermann de Meer

Publications

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Journal articles:

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Patrick Wuechner, Janos Sztrik and Hermann De Meer
Finite-source M/M/S retrial queue with search for balking and impatient customers from the orbit
Computer Networks (ComNet), 53(8):1264--1273
2009

Note: Performance of Computer Networks: Special Issue in Memory of Dr. Gunter Bolch.

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Patrick Wuechner, Janos Sztrik and Hermann De Meer
Investigating the mean response time in finite-source retrial queues using the algorithm by Gaver, Jacobs, and Latouche
Annales Mathematicae et Informaticae (AMI), 36:143--160
2009
ISSN: 1787-5021 (Print); 1787-6117 (Online)
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Matthias Hollick, Hermann De Meer, Jens B. Schmitt and Patrick Wuechner
Modeling of Self-Organizing Systems (Guest Editorial)
Praxis der Informationsverarbeitung und Kommunikation (PIK), 31(1):2--3
2008
ISSN: 0930-5157

Note: Editorial

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Patrick Wuechner, Janos Sztrik and Hermann De Meer
The Impact of Retrials on the Performance of Self-Organizing Systems
Praxis der Informationsverarbeitung und Kommunikation (PIK), 31(1):29--33
2008
ISSN: 0930-5157

Conference and workshop papers:

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Patrick Wuechner, Janos Sztrik and Hermann De Meer
Modeling Wireless Sensor Networks Using Finite-Source Retrial Queues with Unreliable Orbit
Proc. of the Workshop on Performance Evaluation of Computer and Communication Systems (PERFORM 2010) Volume 6821 of Lecture Notes in Computer Science (LNCS) , page 73--86.
Publisher: Springer-Verlag,
2011

Note: The original publication is available at www.springerlink.com

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Patrick Wuechner, Janos Sztrik and Hermann De Meer
Finite-Source Retrial Queues with Applications
Proc. of the 8th Int'l Conf. on Applied Informatics Volume 2 , page 275--285.
2010
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Patrick Wuechner, Janos Sztrik and Hermann De Meer
Homogeneous Finite-Source Retrial Queues with Search of Customers from the Orbit
Proc. of the 14th GI/ITG Conf. on Measurement, Modelling and Evaluation of Computer and Communication Systems (MMB 2008) , page 109--124.
Publisher: VDE Verlag,
2008
ISBN: 978-3-8007-3090-2
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Patrick Wuechner, Hermann De Meer, Gunter Bolch, Janos Roszik and Janos Sztrik
Modeling Finite-Source Retrial Queueing Systems with Unreliable Heterogeneous Servers and Different Service Policies Using MOSEL
In Khalid Al-Begain, Armin Heindl and Miklos Telek, editor, Proc. of the 14th Int'l Conf. on Analytical and Stochastic Modelling Techniques and Applications (ASMTA 2007) , page 75--80.
2007
ISBN: 0-9553018-4-X (Print); 0-9553018-3-1 (CD)
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Patrick Wuechner, Janos Sztrik and Hermann De Meer
Structured Markov Chains Arising from Homogeneous Finite-Source Retrial Queues with Orbital Search
In Dario Bini, Beatrice Meini, Vaidyanathan Ramaswami, Marie-Ange Remiche and Peter Taylor, editor, Proc. of the Dagstuhl Seminar on Numerical Methods for Structured Markov Chains Volume 07461 of Dagstuhl Seminar Proceedings
Publisher: Schloss Dagstuhl, Leibniz-Zentrum fuer Informatik GmbH, Dagstuhl, Germany
2007

PhD theses:

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Patrick Wuechner
Energy-Efficient and Timely Event Reporting Using Wireless Sensor Networks
University of Passau,
2013

Technical reports:

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Gunter Bolch, Janos Roszik, Janos Sztrik and Patrick Wuechner
Modeling Finite-Source Retrial Queueing Systems with Unreliable Heterogeneous Servers and Different Service Policies using MOSEL
Document number: MIP-0611
Faculty of Computer Science and Mathematics (FIM), University of Passau,
2006
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