Quality of Service (QoS) in the Internet: Technologies and Trends

6 June, 2016

Título:Quality of Service (QoS) in the Internet: Technologies and Trends
Univ.-Prof. DI Dr. Hermann HELLWAGNER
Dept. of Information Technology
University Klagenfurt
Klagenfurt, Austria
Fecha impartición: 20 – 22 Febrero de 2002
20 Feb: 4 horas; 21 Feb: 3 horas; 22 Feb: 3 horas.
Horario: de 16 a 20 horas.
Duración: 10 horas.
Lugar: Escuela Politécnica Superior Universidad Carlos III. Leganés, Madrid
AULA: 20D10. Edificio Sabatini.

Material del seminario:


Short biography of the author:

Hermann Hellwagner received his Dipl.-Ing. degree (in Informatics) and Ph.D. degree (Dr. techn.) in 1983 and 1988, respectively, both from the University Linz, Austria.

From 1989 to 1994, he was senior researcher and team/project manager at Siemens AG, Corporate Research and Development, München, Germany, working on distributed shared memory, parallel file systems, and performance analysis of computer and communication systems. From 1995 to 1998, he was associate professor of parallel computer architecture at Technische Universität München (TUM) where he led a group of researchers working on compute clusters and lightweight protocols and communication libraries based on the high-performance Scalable Coherent Interface (SCI) system area network. Since late 1998, Dr. Hellwagner has been a full professor of computer science in the Department of Information Technology at the University Klagenfurt, Austria. His current areas of interest are multimedia communication, cluster computing, embedded systems, and hardware/software interaction. Current projects are on digital video communication and adaptation and a high-end thin client specifically targeted at CAD applications.

Dr. Hellwagner is co-editor of a book (on SCI) in the Springer LNCS State-of-the-Art Survey series, (co-)editor of five workshop proceedings, author of seven book chapters, and (co-)author of about 40 conference and journal papers and of several technical reports and project reports. He is Subject Area Editor for Computer Architecture of the Journal of Systems Architecture (JSA). He initiated two annual international workshop series (HIPS and SCI-Europe), and has served as a program committee member for several international conferences (recently, for FTPDS’2001, EBP’01, Cluster’2001, NCA’01, and CCGrid’2001) and a reviewer for several journals and many conferences.

Dr. Hellwagner is a member of IEEE, GI (German Informatics Society), and OCG (Austrian Computer Society). He is also the head of the Austrian delegation to the ISO/IEC MPEG standardization group.

Abstract of the course:

Quality of Service (QoS) mechanisms become increasingly important in computer and communication networks, both for the transmission of multimedia data (e.g., audios and videos, with real-time constraints) and for business-critical data (e.g., transactions in e-commerce systems, with high-reliability requirements). In recent years, intense research and standardization activities have been carried out to establish QoS mechanisms and technologies for the (future) Internet which, by way of its original design and evolutionary growth, provides best-effort data transfers only. This seminar will give a motivation for Internet QoS, present the principal technologies and protocols devised and standardized by the IETF to provide QoS guarantees, and discuss the current status and potential trends of QoS mechanisms in IP-based networks. A case study will also be discussed.


1. Motivation for Internet Qos

2. QoS Principles and Terminology (definitions, requirements, parameters,
specification, negotiation, resource reservation and management, traffic
shaping and policing,…)

3. QoS Architectures

4. Queueing Techniques for QoS

5. Integrated Services (IntServ), Resource Reservation Protocol (RSVP)

6. Differentiated Services (DiffServ)

7. Multiprotocol Label Switching (MPLS)

8. Protocols for Real-Time Data Transfers (RTP, RTCP, RTSP)

9. Case Study: Internet Telephony

10. Discussion: Status and Potential Trends

Prerequisites of students:

The students are expected to have a working knowledge of IP-based networks and the TCP/IP protocol family.


John Barnes, Programming in Ada 95, 2nd. Ed, Addison-Wesley, 1998.