Stefan Geißler M. Sc.

Telefon	(0931) 31-83134
Telefax	(0931) 31-86632
E-Mail	stefan.geissler@informatik.uni-wuerzburg.de
Raum	A209
Anschrift	Lehrstuhl für Informatik III Am Hubland D-97074 Würzburg

Contents: Overview | Publications | Teaching | Working Group

Research Interests

My research interests include the following topics:

Software-defined Networking (SDN) and Network Function Virtualization (NFV)
IoT
5G mobile communication
Blockchain systems
Traffic measurements and traffic modeling
Performance evaluation and modeling of communication systems
Simulation of communication systems and network applications

Recent Publications

Geissler, S., Herrnleben, S., Bauer, R., Grigorjew, A., Jarschel, M., Zinner, T.: The Power of Composition: Abstracting a Multi-Device SDN Data Path Through a Single API. IEEE Transactions on Network and Service Management. (2019).

[ BibTeX ] [ EndNote ]

@article{info3-article-2019-11, author = {Geissler, Stefan and Herrnleben, Stefan and Bauer, Robert and Grigorjew, Alexej and Jarschel, Michael and Zinner, Thomas}, journal = {IEEE Transactions on Network and Service Management}, keywords = {myown sendate-planets fia sys:hidden:article}, month = 11, title = {The Power of Composition: Abstracting a Multi-Device SDN Data Path Through a Single API}, year = 2019 }

%0 Journal Article %1 info3-article-2019-11 %A Geissler, Stefan %A Herrnleben, Stefan %A Bauer, Robert %A Grigorjew, Alexej %A Jarschel, Michael %A Zinner, Thomas %D 2019 %J IEEE Transactions on Network and Service Management %T The Power of Composition: Abstracting a Multi-Device SDN Data Path Through a Single API
Wamser, F., Tran-Gia, P., Geißler, S., Hoßfeld, T.: Modeling of Traffic Flows in Internet of Things Using Renewal Approximation. International Conference on Optimization and Decision Science (ODS2019) (2019).

[ Abstract ] [ BibTeX ] [ EndNote ] [ Download ]

This paper proposes a versatile approach to model aggregated traffic flows in the Internet of Things (IoT) using renewal approximation. The modeled traffic originates from a large number of sources or devices consisting of a set of sensors mixed with classical elastic random traffic modeled as Poisson arrival process. The work shows the exact derivation in the simple case for periodic sensors. It shows further results in the mixed case with periodic sensors and a background process. The renewal approximation allows to derive the required number of sensors such that the aggregated traffic can be approximated as Poisson process.

@inproceedings{info3-article-2019-8, abstract = {This paper proposes a versatile approach to model aggregated traffic flows in the Internet of Things (IoT) using renewal approximation. The modeled traffic originates from a large number of sources or devices consisting of a set of sensors mixed with classical elastic random traffic modeled as Poisson arrival process. The work shows the exact derivation in the simple case for periodic sensors. It shows further results in the mixed case with periodic sensors and a background process. The renewal approximation allows to derive the required number of sensors such that the aggregated traffic can be approximated as Poisson process.}, author = {Wamser, Florian and Tran-Gia, Phuoc and Geißler, Stefan and Hoßfeld, Tobias}, booktitle = {International Conference on Optimization and Decision Science (ODS2019)}, keywords = {myown 5cale sys:hidden:inproceedings net-man iot can}, month = 9, title = {Modeling of Traffic Flows in Internet of Things Using Renewal Approximation}, year = 2019 }

%0 Conference Paper %1 info3-article-2019-8 %A Wamser, Florian %A Tran-Gia, Phuoc %A Geißler, Stefan %A Hoßfeld, Tobias %B International Conference on Optimization and Decision Science (ODS2019) %D 2019 %T Modeling of Traffic Flows in Internet of Things Using Renewal Approximation %X This paper proposes a versatile approach to model aggregated traffic flows in the Internet of Things (IoT) using renewal approximation. The modeled traffic originates from a large number of sources or devices consisting of a set of sensors mixed with classical elastic random traffic modeled as Poisson arrival process. The work shows the exact derivation in the simple case for periodic sensors. It shows further results in the mixed case with periodic sensors and a background process. The renewal approximation allows to derive the required number of sensors such that the aggregated traffic can be approximated as Poisson process.
Geißler, S., Prantl, T., Lange, S., Wamser, F., Hoßfeld, T.: Discrete-Time Analysis of the Blockchain Distributed Ledger Technology. 31st International Teletraffic Congress (ITC). , Budapest, Hungary (2019).

[ Abstract ] [ BibTeX ] [ EndNote ] [ Download ]

Blockchain and distributed ledger technologies have become more and more popular and widespread during recent years. After the initial hype about the technology and many cryptocurrency related use cases, the technology slowly starts to make its way into other domains like food tracking and document management. In order to further contribute to the search of what this technology can be used for, more detailed performance evaluations are required in order to investigate key performance indicators and general limits of the technology. To this end, we develop a discrete-time queueing model that allows a detailed evaluation of the characteristics of a blockchain system, such as the transaction waiting time distribution. Furthermore, we validate the model by comparing the results to values obtained from measurements in a closed lab environment based on the Ethereum blockchain.

@inproceedings{info3-inproceedings-2019-19, abstract = {Blockchain and distributed ledger technologies have become more and more popular and widespread during recent years. After the initial hype about the technology and many cryptocurrency related use cases, the technology slowly starts to make its way into other domains like food tracking and document management. In order to further contribute to the search of what this technology can be used for, more detailed performance evaluations are required in order to investigate key performance indicators and general limits of the technology. To this end, we develop a discrete-time queueing model that allows a detailed evaluation of the characteristics of a blockchain system, such as the transaction waiting time distribution. Furthermore, we validate the model by comparing the results to values obtained from measurements in a closed lab environment based on the Ethereum blockchain.}, author = {Geißler, Stefan and Prantl, Thomas and Lange, Stanislav and Wamser, Florian and Hoßfeld, Tobias}, booktitle = {31st International Teletraffic Congress (ITC). , Budapest, Hungary}, keywords = {myown blockchain sys:hidden:inproceedings ngn net-man}, month = 8, title = {Discrete-Time Analysis of the Blockchain Distributed Ledger Technology}, year = 2019 }

%0 Conference Paper %1 info3-inproceedings-2019-19 %A Geißler, Stefan %A Prantl, Thomas %A Lange, Stanislav %A Wamser, Florian %A Hoßfeld, Tobias %B 31st International Teletraffic Congress (ITC). , Budapest, Hungary %D 2019 %T Discrete-Time Analysis of the Blockchain Distributed Ledger Technology %X Blockchain and distributed ledger technologies have become more and more popular and widespread during recent years. After the initial hype about the technology and many cryptocurrency related use cases, the technology slowly starts to make its way into other domains like food tracking and document management. In order to further contribute to the search of what this technology can be used for, more detailed performance evaluations are required in order to investigate key performance indicators and general limits of the technology. To this end, we develop a discrete-time queueing model that allows a detailed evaluation of the characteristics of a blockchain system, such as the transaction waiting time distribution. Furthermore, we validate the model by comparing the results to values obtained from measurements in a closed lab environment based on the Ethereum blockchain.
Skwarek, V., Reher, J., Geißler, S., Zinner, T.: Automation und Digitalisierung - Potenzial und Einsatz von Blockchain- und Distributed-Ledger-Technologien in der Automatisierungstechnik, (2019).

[ BibTeX ] [ EndNote ]

@misc{info3-misc-2019-1, author = {Skwarek, Volker and Reher, Julian and Geißler, Stefan and Zinner, Thomas}, howpublished = {Zentralverband Elektrotechnik- und Elektroindustrie}, keywords = {myown blockchain ngn net-man sys:hidden:misc}, month = 2, title = {Automation und Digitalisierung - Potenzial und Einsatz von Blockchain- und Distributed-Ledger-Technologien in der Automatisierungstechnik}, year = 2019 }

%0 Generic %1 info3-misc-2019-1 %A Skwarek, Volker %A Reher, Julian %A Geißler, Stefan %A Zinner, Thomas %D 2019 %T Automation und Digitalisierung - Potenzial und Einsatz von Blockchain- und Distributed-Ledger-Technologien in der Automatisierungstechnik
Flittner, M., Bauer, R., Rizk, A., Geissler, S., Zinner, T., Zitterbart, M.: Taming the complexity of artifact reproducibility. Proceedings of the Reproducibility Workshop (2018).

[ Abstract ] [ BibTeX ] [ EndNote ]

Reproducing research results, as it is required for peer review, can be a time-consuming and difficult task. In this work, we propose three approaches to improve the way of how research results can be substantiated and discuss their applicability. Our proposals are based on a brief study on evaluation methods (for SDN research) and insights from a comprehensive discussion on reproducibility.

@inproceedings{info3-inproceedings-2018-45, abstract = {Reproducing research results, as it is required for peer review, can be a time-consuming and difficult task. In this work, we propose three approaches to improve the way of how research results can be substantiated and discuss their applicability. Our proposals are based on a brief study on evaluation methods (for SDN research) and insights from a comprehensive discussion on reproducibility.}, author = {Flittner, Matthias and Bauer, Robert and Rizk, Amr and Geissler, Stefan and Zinner, Thomas and Zitterbart, Martina}, booktitle = {Proceedings of the Reproducibility Workshop}, keywords = {myown sys:hidden:inproceedings ngn}, month = 8, title = {Taming the complexity of artifact reproducibility}, year = 2018 }

%0 Conference Paper %1 info3-inproceedings-2018-45 %A Flittner, Matthias %A Bauer, Robert %A Rizk, Amr %A Geissler, Stefan %A Zinner, Thomas %A Zitterbart, Martina %B Proceedings of the Reproducibility Workshop %D 2018 %T Taming the complexity of artifact reproducibility %X Reproducing research results, as it is required for peer review, can be a time-consuming and difficult task. In this work, we propose three approaches to improve the way of how research results can be substantiated and discuss their applicability. Our proposals are based on a brief study on evaluation methods (for SDN research) and insights from a comprehensive discussion on reproducibility.

Stefan Geißler M. Sc.

Research Interests

Recent Publications

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