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University of Bonn
Institute of Computer Science IV
Prof. Martini

Projects



Communication Systems

Project leader: Prof. Dr. Peter Martini


Ongoing projects

Completed projects



Ongoing projects

EU projects

Phosphorus - Lambda User Controlled Infrastructure For European Research

Funded by

The Phosphorus project is funded by the EU as part of the IST (Information Science Technologies) 6th Framework Programme. Duration: 01.10.2006 - 31.03.2009.

Contact

Dr. Christian de Waal, Markus Pilz, Christoph Barz and Alexander Willner

Abstract

The Phosphorus project aims at enabling on-demand end-to-end services in optical networks across multiple domains.

The task of network resource provisioning is faced from the domain-centralized approach followed by existing NRPSs (Network Resource Provisioning Systems) as well as from the distributed approach followed by GMPLS (Generalized Multi-Protocol Label Switching). For the domain-centralized approach, existing NRPSs (such as the ARGON system developed by the University of Bonn and other German partners within the German VIOLA project) are adapted to interact with each other in a multi-domain environment. For the distributed approach, a GMPLS control plane enhanced by Grid resource awareness is developed.

Partners

The Phosphorus testbed involves the European NRENs (National Research and Education Networks)

as well as the national testbeds

Furthermore, the Phosphorus testbed includes partners from the USA and from Canada.

Further information

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BMBF projects (Federal Ministry of Education and Research)

VIOLA - Vertically Integrated Optical Testbed for Large Applications

Funded by

BMBF. Duration: 01.06.2004 - 30.04.2007.

Contact

Markus Pilz and Christoph Barz

Abstract

The German research project VIOLA, which is funded by the BMBF, aims at the development of new mechanisms of advanced and dynamic user bandwidth allocation and reservation in a heterogeneous multi vendor network infrastructure. In this context recent signalling mechanisms and network services are evaluated as a basis for the X-WiN network, the next generation research network in Germany.

The VIOLA approach addresses network resources the same way as computation and storage resources in the Grid environment. A combined reservation of computational, storage and network resources allows for a user- or application-driven selection and reservation of network connections with dedicated QoS based on evolving network technologies. The developments are carried out in close cooperation with the Fraunhofer-Institute for Algorithms and Scientific Computing (SCAI) and the Fraunhofer-Institute for Intelligent Analysis and Information Systems (IAIS) in Sankt Augustin, as well as the Central Institute for Applied Mathematics (ZAM) of the Research Center Julych. The main focus of our institute is the development of ARGON (Allocation and Reservation in Grid-enabled Optical Networks) a Network Resource Provisioning System (NRPS) that offers the Grid middleware a service oriented interface to network resources. Further development of ARGON is carried on in the European IST project Phosphorus.

A basis for the testing of the VIOLA developments is a testbed for hybrid data- and optical networks. It connects over ten research locations in Germany with 10 Gbit/s SDH and Ethernet. The VIOLA backbone comprises the area of Aachen-Bonn-Cologne with extensions to Nuremberg and Erlangen. In addition, the network is interconnected to research networks like the European GÉANT(2) network via the G-Win/X-WiN.

Partners

Further information

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Completed projects

EU projects

OverDRiVE - Spectrum Efficient Uni- and Multicast Services over Dynamic Multi-Radio Networks in Vehicular Environments

Funded by

OverDRiVE is a research and technology development (RTD) project sponsored by the European Commission under the Information Technologies Programme (IST), which is one of the thematic programmes of the Fifth RTD Framework Programme. Duration: 01.04.2002 - 31.03.2004.

Contact

Dr. Matthias Frank

Abstract

The European research project OverDRiVE (Spectrum Efficient Uni- and Multicast Over Dynamic Radio Networks in Vehicular Environments) aims at UMTS enhancements and coordination of existing radio networks into a hybrid network to ensure spectrum efficient provision of mobile multimedia services. An IPv6 based architecture enables interworking of cellular and broadcast networks in a common frequency range with dynamic spectrum allocation (DSA).
The project builds on the findings of the succesful DRiVE project. The project objective is to: enable and demonstrate the delivery of spectrum efficient multi- and unicast services to vehicles. OverDRiVE addresses resource efficiency by sharing network and spectrum resources. OverDRiVE will:

Partners

Further information

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DRiVE - Dynamic Radio for IP services in Vehicular Environments

Funded by

DRiVE is funded by the EU as part of the IST (Information Science Technologies) 5th Framework Programme. Duration: 01.04.2000 - 31.03.2002.

Contact

Dr. Matthias Frank

Abstract

The citizens' expectation for cost efficient provision of existing and emerging mobile multimedia services for information, education, and entertainment is faced with the reality of scarce radio resources. This discrepancy is especially true for the delivery of high-quality services to highly mobile environments such as cars, busses and trains. The overall objective of the DRiVE project is:

To achieve this objective the DRIVE project addresses the convergence of cellular and broadcast networks to lay the foundation for innovative IP-based multimedia services. Therefore, DRiVE tackles two key issues:

  1. Inter-working of different radio systems (GSM, GPRS, UMTS, DAB, DVB-T) in a common frequency range with dynamic spectrum allocation.
  2. Co-operation between network elements and applications in an adaptive manner.

Partners

  • Ericsson Eurolab Deutschland (D) (project coordinator)
  • British Broadcasting Corporation (UK)
  • Bertelsman mediaSystems (D)
  • Daimler Chrysler AG (D)
  • Ericsson Mobile Data Design AB (S)
  • Heinrich-Hertz-Institute for Nachrichtentechnik Berlin GmbH (D)
  • Nokia Corporation (FIN)
  • Rheinische Friedrich-Wilhelms Universität (D)
  • Robert Bosch GmbH (D)
  • RWTH-Aachen (D)
  • Tesci (F)
  • University of Surrey (UK)
  • VCON Telecommunication LTD (IL)
  • Vodafone Limited (UK)
IST banner
DRiVE logo

Further information

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AMUSE - Advanced Multimedia Services for Residential Users

Funded by

AMUSE is funded by the EU as part of the ACTS (Advanced Communications Technologies and Services) support programme. Duration: 01.09.1995 - 31.08.1998.

Contact

Dr. Matthias Frank

Abstract

Only a German abstract is available.

Partners

  • Acorn Computers Ltd. (UK))
  • Autor Tecnologias Multimedia Lda (P)
  • CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. (I)
  • Deutsche Telekom AG (D)
  • IDEA S. C. (B)
  • INESC Instituto de Engenharia de Sistemas e Computadores (P)
  • ITALTEL S.p.A. (I)
  • McCANN Erickson Italiana S.p.A (I)
  • NTUA Institute of Communication and Computer Systems (GR)
  • Nyherji Ltd. (IC)
  • ORCKIT Communications Ltd. (Israel)
  • Portugal Telecom - CET (P)
  • Post and Telecom Iceland (IC)
  • Siemens Aktiengesellschaft (D)
  • Siemens Atea (B)
  • Siemens GEC Communications Systems Ltd. (UK)
  • Siemens Nixdorf Information Systems (D)
  • Siemens Switzerland Aktiengesellschaft (CH)
  • SIRTI S.p.A. (I)
  • Swisscom (CH)
  • Telecom Italia S.p.A. (I)
  • University of Iceland (IC)
  • University of Bonn (D)
  • University of Stuttgart/ IKR (D)
  • Videotime (I)
AMUSE logo

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Other projects

iBGP Route Server

Duration

01.01.2007 to at first 31.12.2008.

Contact

Uli Bornhauser

Abstract

Only a German abstract is available.

Partner

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Honeypots and Honeynets

Duration

Since 2006.

Contact

Elmar Gerhards-Padilla and Christoph Fuchs

Abstract

The concept of honeypots has already proven to be of great value whithin the detection and analysis of new kinds of computer attacks. A honeypot in this context, is an unused network resource (e.g. PC, router, ip address) whose sole purpose lies within being attacked and compromised. In contrast to other intrusion detection mechanisms, honeypots have the clear advantage that every access can be regarded as illicit and thus treated as an attack. Consequently there is no need to distinguish between regular and illegal data traffic in a first step. As an effect, the amount of data to be analysed is considerably reduced. Nevertheless, the quantity of captured data at a honeypot tends to be enormous, which leads to the necessity of methods for automated analysis. These methods should allow to differentiate between known and unknown attacks, record them, identify the exploited vulnerability and ideally generate a signature of the observed attack.

Objectives

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FGAN: Link-Quality-Based Routing in Wireless Ad Hoc Networks (WNet)

Duration

2006 to 2007.

Contact

Dr. Christian de Waal

Abstract

Only a German abstract is available.

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FGAN: Mobile Intrusion Detection for Tactical Environments (MITE)

Duration

2005 to 2008.

Contact

Elmar Gerhards-Padilla and Nils Aschenbruck

Abstract

Mobile Multi-hop Ad hoc NETworks (MANETs) are also used in tactical scenarios. Especially in these scenarios security is a specific challenge. Thus, there is a demand for reliable intrusion detection and response systems.

Diploma Theses

Labs

Technical Reports

Links

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Performance Engineering

Duration

Since 2004.

Contact

Lukas Pustina

Abstract

The increasing complexity of modern communication systems and devices as well as the shorter product cycles force system developers to consider the performance of their products as early as possible. Therefore, performance aspects become more and more important in today's system design and should be considered during the whole development cycle.

Performance Engineering is a wholistic approach towards product design keeping performance issues to the front throughout the development cycle. In general, the developers add non-functional requirements to the functional system model. From experience and measurements of previous systems, the developers try to model the expected performance and demand of each individual system component after which the system can be analysed and compared to the requirements.

We look at this topic from two different sides. On the one hand, the performance aware modelling helps the developers to understand the impact of design choices already during the design phase. On the other hand, it is also necessary to be able to predict the run time of systems on future platforms. This holds especially for embedded devices where special purpose processors are tailored according to the developer's needs. Thus, the developers have to be aware which particular feature they would like to have in future platforms. In this case, it is helpful to see how new features behave before real hardware is produced.

As an industry-wide standard design language, the Unified Modelling Language (UML) provides means for annotating models with performance measures using the UML Profile for Schedulability, Performance, and Time (SPT-profile). From those annotated system models, a performance model may be generated which is then used to analyse the system in order to identify performance bottlenecks as early as possible. Common performance models used for this purpose include queueing networks, Petri nets, or event-driven simulation, depending on the level of detail requested and available. Additionally, measurements using prototype implementations provide further insight that complements the analytical estimates gained from the earlier development steps.

SysML, Model-Driven-Architecture, and the upcoming UML profile for "Modeling and Analysis of Real-Time and Embedded systems" (MARTE) are going to introduce a significant help for the developers on this field.

On the platform side, we focused our research on trying to predict changes of widely used embedded platforms. The ARM microprocessor is the core of Texas Instruments' OMAP boards and as such used in many embedded systems (e.g. mobile phones, DVD players, routers etc.). In order to evaluate new hardware designs already during early stages of the product development process when prototype hardware is not yet available, it is important to understand the performance characteristics of ARM processors and of the whole platform on different levels of abstraction. One approach to achieve this is to use the execution trace of an existing application on an existing hardware platform and analyse the run time of this code trace on a model of a target hardware platform. If the application itself is well understood, i.e. timing and resource requirements are known, the processor model may focus on the mere timing of instructions, avoiding the need for a detailed functional emulation of the hardware platform. This greatly simplifies the implementation of the hardware model since an interpretation of the application code is not required. By allowing for a parametrisation of the model, new features or whole platform modifications can be analysed and their impact on the application can be understood.

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Modelling Mobility and Traffic for Disaster Area Scenarios

Duration

Since 2004.

Contact

Nils Aschenbruck

Abstract

In catastrophe situations, public safety units need reliable communication systems. Due to the fact that any kind of infrastructure may have been destroyed by the catastrophe, there is a demand for communication systems independent from infrastructure in this "disaster area scenario". Especially for Mobile Multi-hop Ad hoc NETworks (MANETs) this scenario follows as a quasi canonical scenario. MANETs satisfy the requirement of being independent of any kind of infrastructure by their very definition. When creating a scenario for performance evaluation of MANETs, modelling the mobility and the traffic are important tasks because the results of the evaluation strongly depend on the models used.

Diploma Theses

Labs:

Links

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Parallel and Distributed Simulation

Duration

Since 2004.

Contact

Patrick Peschlow

Abstract

Only a German abstract is available.

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Mobile software-defined radio architectures Mobile software-defined radio architectures

Duration

2005 to 2007

Contact

Felix Leder

Abstract

Only a German abstract is available.

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T-Mobile: Automatic tests of mobile networks

Duration

01. November 2005 to 01. January 2007.

Contact

Felix Leder

Abstract

Only a German abstract is available.

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FGAN: Capacity determination in heterogeneous narrow-band IP networks

Duration

April 2005 to April 2006.

Contact

Markus Pilz

Abstract

Only a German abstract is available.

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Intrusion Detection at the PSAP

Duration

2005 to 2006.

Contact

Nils Aschenbruck

Abstract

In the past years Voice over IP (VoIP) telephony started to migrate from the research to the market. It is expected that in the future All-IP networks will substitute the classical Public Switched Telephony Networks (PSTNs). Nowadays, there is no All-IP network yet, but first steps have been made. There are different VoIP-providers which do not only provide telephony service between two VoIP peers, but also enable calls from VoIP to PSTNs and vice versa by providing gateway services between PSTN and VoIP networks. Thus, the PSAP is accessible by the VoIP network (e.g. the Internet). As a result of this connection there are further challenges concerning the security of the PSAP. There is especially the danger of denial of service (DoS) attacks. Thus, there is a need for an appropriate Intrusion Detection and Response.

Diploma Theses

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High performance transport protocols

Duration

1994 to 2000.

Contact

Dr. Matthias Frank

Abstract

Only a German abstract is available.

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DFG projects (German Research Foundation)

DiffServ-based End-to-End Reservation for accessing distributed Media Servers in the Internet

Funded by

German Research Foundation; Duration: 2001 to 2006.

Contact

Patrick Peschlow

Abstract

Only a German abstract is available.

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Simultaneous Events in Discrete-event Simulation of Computer Networks

Funded by

German Research Foundation; Duration: 2000 to 2006.

Contact

Patrick Peschlow

Abstract

Discrete-event simulation is a widespread technique for the analysis and performance evaluation of systems. The simulated system is modeled by a set of state variables, activities are represented by events. Each event consists of a timestamp as well as an associated action. All future events are stored in an event list and are executed by a scheduler in the order of their timestamps.

A well-known challenge in discrete-event simulation is the problem of simultaneous events: If two or more events contain identical timestamps, their execution order is not clear. Moreover, different execution orders may lead to different states, and thus to different simulation results. Commonly, simultaneous events are handled by tie-breaking rules, which use priorities in order to enforce well-defined orderings and thus reproducible simulation results.

While tie-breaking rules are an accepted solution, they may be criticized as well: By choosing only execution order of simultaneous events, all others are implicitly labeled as irrelevant (or wrong). As a consequence, only one out of possibly many correct simulation results is selected without caring about the others. This questions the significance of simulation results. Therefore, in order to increase confidence in simulation results, it may be useful to have means of analyzing the effects of simultaneous events.

In the project Simultaneous Events in Discrete-event Simulation of Computer Networks, we have developed a branching mechanism which analyzes simultaneous events during run-time of the simulation. When different execution orders lead to different states, the simulation run is split into multiple branches, and a set of simulation results is computed. We implemented the branching mechanism for the simulation tool MOOSE. Thereby, we applied different techniques in order to restrict branching to cases the user is really interested in, and thus managed to make branching a practical method.

While MOOSE was initially developed as a sequential simulation tool, we examined various ways of parallelizing the simulation in the further course of the project. First of all, we extended MOOSE so that newly created branches may be distributed onto other hosts for computation. This can strongly reduce simulation run-times when analyzing simultaneous events. Our second approach was the extension of MOOSE to a real distributed simulation tool. In distributed simulation, a simulation run is partitioned into multiple logical processes and then distributed among the participating hosts. This way, all hosts jointly compute a single simulation scenario. For the synchronization of the logical processes, MOOSE provides both conservative and optimistic synchronization. Although the handling of simultaneous events is much more complex here (for example, already the efficient detection of simultaneous events proves hard), we successfully implemented the branching mechanism for distributed simulation, too. This constitutes an important contribution in the research area of distributed simulation.

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Communication protocols to support efficiently the use of digital Libraries in telemedicine

Funded by

German Research Foundation; Duration: 1997 to 2000.

Contact

Dr. Matthias Frank

Abstract

Only a German abstract is available.

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High-performance computing and gigabit networks

Funded by

German Research Foundation; Duration: 1997 to 2000.

Contact

Prof. Dr. Peter Martini

Abstract

Only a German abstract is available.

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New transport protocols for cooperative computer maintenance in heterogeneous LAN systems

Funded by

German Research Foundation; Duration: 1995 to 1998.

Contact

Dr. Matthias Frank

Abstract

Only a German abstract is available.

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Overload protection in Metropolitan Area Networks

Funded by

German Research Foundation; Duration: January 1992 to July 1999.

Contact

Dr. Matthias Frank

Abstract

Only a German abstract is available.

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BMBF projects (Federal Ministry of Education and Research)

IPonAir - Next Generation Wireless Routing

Funded by

BMBF - HyperNet. Duration: October 2001 - September 2004.

Contact

Dr. Christian de Waal and Dr. Matthias Frank

Abstract

Only a German abstract is available.

Partners

Further information

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Last update: May 2007


- / 02.05.07 - willner@cs.uni-bonn.de