Hans-Peter Schwefel

Affiliation:

Department of Electronic Systems Networking and Security (NetSec) Section
Aalborg University
Niels Jernes Vej 12/A5-212
9220 Aalborg-Øst Denmark

E-mail: hps@kom.aau.dk

Phone: +45 9940-8677 Fax: +45 9815-1583

Additional affiliation: Forschungszentrum Telekommunikation Wien, FTW; Phone: +43 1 505 28-3034

Short Biography:
Hans-Peter Schwefel is an Associate Professor and head of the IP Labs at Aalborg University, Denmark. In addition, he is coordinating the ‘Networked Services’ Research Area at FTW, Austria. His research focuses on IP based communication networks with main interest in performance and dependability aspects.
Before he joined Aalborg University, he was a project manager at Siemens Information and Communication Mobile, supervising research projects and responsible for the development of technical concepts for next generation mobile networks. He obtained his doctoral degree in the area of IP traffic and performance modeling from the Technical University in Munich, Germany. For his research activities, he also spent extended periods of time at the University of Connecticut, USA, and at AT&T Labs, USA, and, more recently, at University of Florence and CNR-ISTI in Pisa, Italy..

Click here (840kB pdf ) for more details about the WING group and the IP Labs.

Research Projects

HIghly DEpendable ip-based NETworks and Services (HIDENETS, European 6th Framework Program)
Safe Driver Machine Interface for ERTMS Automatic Train Control (SafeDMI, European 6th Framework Program)
Wireless Hybrid Enhanced Mobile Radio Estimators (WHERE, European 7th Framework Program)
Open Pervasive Environments for migratory iNteractive services (OPEN, European 7th Framework Program)
My Adaptive Global Network (MAGNET Beyond, European 6th Framework Program)
Efficient multicast and robustness in next generation mobile networks, Cooperation (2 PhD projects) with Tietoenator, Denmark.My Adaptive Global Network

Associated projects:

SWACOM (Norway)

Concluded:

Teaching: Previous Semesters (including teaching and supervised student work at TU Munich)

Teaching, Spring 2007 (under construction!)

Lectures:

Student Projects:

4th Semester, Communication Networks:

Emulator design for Flexray in-car networks (w. Jens D. Nielsen): students' page

10th Semester (Master Projects):

Multi-cast in UMTS networks (w. Haibo Wang)
Joint Localisation and environment detection (with Joao Figueiras)
Experimental analysis of ad-hoc networks using a topology emulator (w. Erling Matthiesen)
Cross-Layer Resilience Optimisation (w. Erling Matthiesen)

Teaching, Fall 2006
Lectures:

Algorithms and Architectures (with Jens Myrup Pedersen)
5-th Semester, D Sector
Networks and Data Communication, Module 2 (with Per Printz Madsen)
7-th Semester, former E-line students
Wireless Networking III (with Tatjana K. Madsen)
9th Semester, Mobile Communications, 9th semester DIRS/NPM
Traffic Analysis II (with Henrik Schiøler) : some last minute updates for the last two MM is here
9th semester DIRS/NPM
Networking and protocols for real-time signal transmission
9th Semester Signal and Information Processing in Communications (SIPCOM)
Stochastic Models for Information Processing (with S.V. Andersen, B. Fleury)
9th Semester Signal and Information Processing in Communications (SIPCOM)

Student project proposals:
9th Semester, Mobile Communication:

Efficient Multicast in OFDM systems (w. Haibo Wang)
Cooperative localisation (w. Joao Figueiras)

9th Semester Distributed Real-Time Systems/Network Planning and Management:

Analysis of future in-car networks (with BMW, Munich)
Performance Analysis methodology for high-dependability platforms (with FSC, Munich)
Multi-cast in UMTS networks (w. Haibo Wang)
Joint Localisation and environment detection (with Joao Figueiras)
Experimental analysis of ad-hoc networks using a topology emulator (w. Erling Matthiesen)
cooperative header compression (w. Tatiana Madsen)

Publications (updates for 2006 still missing)

‘Maximum Availability Server Selection Policy for Efficient and Reliable Session Control Systems’, [with M. Bozinovski, R. Prasad]
Accepted with changes for IEEE Transactions on Networking.
`Accuracy and timing aspects of location information based on signal-strength measurements in Bluetooth’ [with J. Figueiras, I. Kovacs]
16^th International Symposium on Personal, Indoor, and Mobile Radio Communication. Berlin, Sept. 2005.
`An enhanced optimized link-state routing with delayed event driven link-state udating’ [with Y. Liu]
16^th International Symposium on Personal, Indoor, and Mobile Radio Communication. Berlin, Sept. 2005.
‘Transient analysis of RED queues: a quantitative analysis of buffer-occupancy fluctuations and relevant time-scales’ [with S. Rank]
To appear in Performance Evaluation.
‘Towards a Network Calculus for Bursty ON/OFF Traffic’, [with M. Jobmann]
19^th International Teletraffic Congress, ITC-19, Aug. 2005. To be published in LNCS, Springer.
. ‘Distributed Redundancy or Cluster Solution? An experimental evaluation of two approaches for dependable mobile Internet services.’[with T. Renier, M. Bozinovski, K. Larsen, R. Prasad, R. Seidl]
International Service Availability Symposium (ISAS), Munich, May 2004. Published in Springer Lecture Notes in Computer Science, 3335, 2005.
‘On Traffic Modeling in GPRS networks’ [with T. Madsen, J. Bøgh, M. Hansen]
8^th International Symposium on Wireless Personal Multimedia Communications , Aalborg, Sept. 2005.
'Enhanced triangulation method for positioning of moving devices’ [with G. Monghal, Y. Malidor, I. Kovacs, J. Figueiras]
8^th International Symposium on Wireless Personal Multimedia Communications , Aalborg, Sept. 2005.
'Optimization of energy efficiency in hybrid routing protocols through dynamic parameter adjustments', [with Y. Liu, E. Mercade]
8^th International Symposium on Wireless Personal Multimedia Communications , Aalborg, Sept. 2005.
‘Improved Channel Allocation and RLC block scheduling for Downlink traffic in GPRS’, [with H. Wang, D. Prasad, X. Zhou, J. Llorente, F. Delawarde, G. Coget, P. Eggers]
Proceedings of Vehicular Technology Conference, Stockholm, May 2005.
‘Bluetooth Scatternet with Infrastructure Support: Formation Algorithms.’ [with T. K. Madsen, F. Gudmundsson, S. Sverrisson, R. Prasad]
Proceedings of Consumer Communications and Networking Conference (CCNC 2005), January, 2005, pp. 13-18.
‘Maximum Availability Server Selection Policy for Session Control Systems based n 3GPP SIP' [with M.Bozinovski, R. Prasad]
Seventh International Symposium on Wireless Personal Multimedia Communications, Italy, Sept. 2004
‘User centric name services for Personal Networks’ [with H. Murakami, R. Olsen, R. Prasad]
Seventh International Symposium on Wireless Personal Multimedia Communications, Italy, Sept. 2004
‘Requirements and high-level architecture for service discovery in Personal Networks', [with R. Olsen, H. Murakami, R. Prasad]
Seventh International Symposium on Wireless Personal Multimedia Communications, Italy, Sept. 2004.
‘Coupling mobility support and TCP performance enhancement in heterogeneous wireless networks' [with D. Dungs, P. Tabery]
Seventh International Symposium on Wireless Personal Multimedia Communications, Italy, Sept. 2004.
‘An algorithm for Controlling Transaction Consistency in SIP Session Control Systems’ [with M. Bozinovski, R. Prasad]
IEE Electronics Letters, 40, 3, 2004, pp. 209-211.
'Evaluation of a Fault-Tolerant Call Control System' [with M. Bozinovski, L. Gavrilovska, R. Prasad]
Factas Universitatis, Series: Electronics and Engineering, vol 17, no. 1, April 2004.

'Distributed Redundancy or Cluster Solution? An experimental evaluation of two approaches for dependable mobile Internet services.' [with T. Renier, M. Bozinovski, K. Larsen, R. Prasad]

‘Transaction Consistency in Replicated SIP Call Control Systems’ [with M. Bozinovski, T. Renier, R. Prasad]
4th International Conference on Information, Communications & Signal Processing, Singapore, December, 2003.

‘A state-of-the-art of WLAN and WPAN’ [with N. Prasad]
Invited paper, European Conference on Wireless Technology, Oct. 2003.
`Resource Allocation for Non-Realtime Data Users in UMTS Uplink.' [with B. Wang, K.C. Chua]
Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC). March 2003.
`Exact buffer overflow calculations for queues via martingales.' [with S. Asmussen, M. Jobmann]
Queueing Systems and Applications, 42, 2002.
(202 kB gzipped postscript)
`On Implementation and Improvement of Robust Header Compression in UMTS'. [with B. Wang, K.C. Chua, R. Kutka, C. Schmidt]
13^th International Symposium on Personal, Indoor, and Mobile Radio Communication. Lisbon, Sept. 2002.
`Large deviations and fast simulation in the presence of boundaries.' [with S. Asmussen, P. Frantz, M. Jobmann]
Stochastic Processes and Applications, 102, p.1-23, 2002.
(138 kB gzipped postscript)
`Comparison of The Analytic N-Burst Model with Other Self-Similar ON-OFF Approximations to Telecommunications Traffic.' [with L. Lipsky, M. Greiner, M. Jobmann]
Proceedings of the IEEE NCA 01, Boston, USA.
(preprint, 141 kB gzipped postscript)
`On the Accuracy of TCP Performance Models'. [with M. Jobmann, D. Höllisch, D. Heyman]
ITCom, 2001. Extended version in preparation.
[extended version draft , 340kB pdf]
`On the Necessity of Transient Performance Analysis in Telecommunication Networks'. [with L. Lipsky, M. Jobmann]
17th International Teletraffic Congress, 2001.
(343 kB pdf)
`Behavior of TCP-like elastic traffic at a buffered bottleneck router'.
IEEE Infocom 2001.
(175kB pdf)
`Impact of aggregated, self-similar ON/OFF traffic on delay in stationary queueing models.' [with L. Lipsky]
Presented at SPIE's International Symposium on Voice, Video, and Data Communications. Boston, 19-22 September, 1999.
Extended Version in Performance Evaluation 43, pp. 203/221, 2001.
(477 kB postscript, extended version).
`Buffer Size Issues in the Presence of Self-Similar Traffic.' [with L. Lipsky]
Presented at the `Third IFIP Workshop on Traffic Management and Design of ATM Networks'. London, 26-27 April, 1999.
(104 kB gzipped postscript).
`Performance Results For Analytic Models Of Traffic In Telecommunication Systems, Based On Multiple ON-OFF Sources With Self-Similar Behavior.' [with L. Lipsky]
Presented at the 16th International Teletraffic Congress, Edinburgh, 7-11 June 1999.
(103 kB gzipped postscript).
`Analytic Models Of Performance In Telecommunication Systems, Based On ON-OFF Traffic Sources With Self-Similar Behavior.' [with L. Lipsky, P. Fiorini]
Presented at the 7th International Conference on Telecommunications Systems, Nashville, 18-21 March 1999.
( 134 kB gzipped postscript).
`N-Burst Processes as Models of Self-Similar Traffic in Telecommunication Systems: Part I and II' [with L. Lipsky]
In M. Greiner, M. Jobmann (Eds.): `Stochastic Modeling of High-Speed Networks', Workshop Proceedings. CS Press, München, 1999.
(367kB gzipped ps).
Thesis
`Performance Analysis of Intermediate Systems Serving Aggregated ON/OFF Traffic with Long-Range Dependent properties'.
Dissertation. September 2000.
(Abstract, Table of Content [443kB postscript] or [73kB pdf], Full text: [3.7MB gzipped pdf])
`Modeling of Packet Arrivals Using Markov Modulated Poisson Processes with Power-Tail Bursts.'

(615 kB gzipped postscript)

Scientific interests

Performance Analysis of Telecommunications Systems
Self-Similar/Long-Range Dependent Traffic Models
TCP flow control; TCP performance models
IP technology in mobile networks
Matrix-Algebraic Methods in Queueing Theory
Numerical Solutions of Markov Chains
Simulation Techniques (Rare Events)

Work Area

Hans-Peter Schwefel, 02.02.07.