Chair of Computer Networks
Latest News
The oral presentation of the
bachelor's thesis
entitled "Live Fernüberwachung von Mobilfunkmessungen" of
Daniel Glanert will take place on
May 31th at
9:00 in room 25.12.02.21.
The oral presentation of the
bachelor's thesis
entitled "Optimierung von Diskretisierungsparametern für die arithmetische Kodierung von Fahrzeugbewegungsdaten" of
Erzen Hyko will take place on
May 11th at
10:00 in room 25.12.02.33.
The oral presentation of the
master's thesis
entitled "Kommunikationsprotokolle für die Fahrzeug-Folge auf Verlustbehafteten Kanälen" of
Till Huslik will take place on
May 11th at
09:30 in room 25.12.02.33.
Die Prüfungstermine für die Prüfungsfächer: Rechnernetze, Vertiefung Rechnernetze und Netzwerksicherheit entnehmen Sie bitte der PDF
Older news
Some Publications
Björn Scheuermann, Wolfgang Kiess, Magnus Roos, Florian Jarre, Martin Mauve.
On the Time Synchronization of Distributed Log Files in Networks with Local Broadcast Media.
IEEE/ACM Transactions on Networking 17 (2), pp. 431--444, April 2009.
Björn Scheuermann, Christian Lochert, Jedrzej Rybicki, Martin Mauve.
A Fundamental Scalabiliy Criterion for Data Aggregation in VANETs.
MobiCom 2009: Proceedings of the Fifteenth ACM SIGMOBILE International Conference on Mobile Computing and Networking, Beijing, China, September 2009.
Christian Lochert, Björn Scheuermann, Martin Mauve.
A Probabilistic Method for Cooperative Hierarchical Aggregation of Data in VANETs.
Elsevier Ad Hoc Networks 8 (5), pp. 518-530, July 2010
Peter Lieven, Björn Scheuermann.
High-Speed Per-Flow Traffic Measurement with Probabilistic Multiplicity Counting.
INFOCOM 2010: Proceedings of the 29th IEEE International Conference on Computer Communications, San Diego, CA, USA, March 2010.
More publications
Our Areas of Research
Computer networks have revolutionized the way people and machines communicate. We are interested in all aspectes of computer networking, from wireless networks
to high speed backbones, from medium access up to distributed applications. Our focus is on solving real-world problems: we often start our work by looking at a
specific application and then investigate what is missing to provide optimal network support for this application. We enjoy working with, building, and evaluating
real-world systems. At the same time we use theoretical analysis to determine the fundamental characteristics of our solutions and simulation to gain an insight how
they work in a complex environment. The following sections give an overview of our current research activities.
Car-to-Car Communication
We envision a future where vehicles will be able to communicate with each other, forming a mobile distributed system.
Our goal is to optimize this system in order to avoid accidents and minimize the waste of resources.
We look at all levels of communication from the MAC layer up to the applications and at all communication technologies from IEEE802.11p to infrastructure-based solutions such as UMTS or LTE.
Our methodology includes theoretical analysis, simulation, emulation, and real-world experiments.
Some of the applications we are investigating are: traffic information systems, intersection warning, parking space management, and road construction support.
We are actively participating in the simTD project and are a development member of the
Car to Car Communication Consortium (C2C-CC) . Our work on peer-to-peer-based traffic information
systems is funded by the Deutsche Forschungsgemeinschaft while we investigate improved beaconing schemes for safety applications in the context of the
Automotive.NRW competition.
Real-World Network Experiments
Real-world experiments are a vital tool for the evaluation of network protocols and algorithms. However, getting accurate, repeatable, and explainable results from those experiments is a significant
challange, in particular when wireless links are part of the experiment. We have developed a set of tools that supports real-world experiments in wireless multi-hop networks. Using these tools it
is possible to carefully plan, conduct, supervise and evaluate experiments with wireless mesh networks, mobile ad-hoc networks, and vehicular ad-hoc networks. The set of tools is available
for free download: EDAT, EXC, and PCAPSYNC
MAC Layer Security
Currently, ARP and DHCP are vulnerable to denial of service and spoofing attacks in large LANs.
We work towards an integrated solution for MAC layer security that will prevent these attacks.
A first version of our software for MAC layer security can be downloaded from the Cryptographic Link Layer project page.
Decentralized Access Point Sharing
Access point sharing allows mobile users being part of an access point sharing community to connect to the Internet via access points owned by other members of that community.
The key challenge of such an approach is to make sure that a community member offering Internet access will take no risks of being legally prosecuted for actions taken by visitors of the access point.
We have developed a fully decentralized solution to this problem and are taking the first steps towards a real-world deployment.
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