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Keynote speakers

Modeling of Content-Oriented Networks

Speaker:

Krzysztof Walkowiak (krzysztof.walkowiak@pwr.wroc.pl), Wroclaw University of Technology, Poland

Abstract:

Multimedia content is currently becoming increasingly common and voluminous in the Internet. For instance, Cisco Visual Networking Index forecasts that by 2016 all forms of video (TV, video on demand, Internet, and P2P) will be approximately 86 percent of global consumer traffic. Remarkable examples of emerging multimedia content-oriented network services include: video streaming (e.g., YouTube), multicasting/broadcasting over IP networks (e.g., IPTV), Content Delivery Networks (e.g., Akamai). However, majority of existing network solutions is not fully prepared to provide the effective delivery of time-sensitive multimedia traffic, partially due to the currently visible dominance of unicast (i.e., point-to-point) transmission. In order to tackle this challenge, a concept of content-oriented networking (CON) has been emerged. This approach comprises a wide range of new solutions developed to provide delivery of various content (mostly multimedia) to requesting users. The talk will focus on one of the aspects of the CON idea, i.e., how to effectively deliver the content. Especially, the talk will describe how to model various network flows proposed to provide the effective content delivery including: multicasting, anycasting, Peer-to-Peer (P2P) systems, and overlays.

Biography of the speaker:

Krzysztof Walkowiak was born in 1973. He received the Ph.D. degree and the D.Sc. (habilitation) degree in computer science from the Wroclaw University of Technology, Poland, in 2000 and 2008, respectively. Currently, he is an Associate Professor at the Department of Systems and Computer Networks, Faculty of Electronics, Wroclaw University of Technology. His research interest is mainly focused on optimization of content-oriented networks; P2P systems; multicasting systems; Grid systems; network survivability; optimization of connection-oriented networks (MPLS, DWDM); elastic optical networks; application of soft-optimization techniques for design of computer networks. Prof. Walkowiak has been involved in many research projects related to optimization of computer networks. He received the Best Paper Award in the International Workshop on Design of Reliable Communication Networks (DRCN 2009). Moreover, he has been consulting projects for large companies including Ernst and Young, Skanska, TP SA, PZU, PKO BP, Energia Pro. Prof. Walkowiak published more than 150 scientific papers. He serves as a reviewer for many international journals and he is actively involved in many international conferences. Prof. Walkowiak is a member of IEEE and ComSoc.

QoS guarantees in NGN networks

Speaker:

Halina Tarasiuk, Institute of Telecommunications, Warsaw University of Technology, halina@tele.pw.edu.pl

Abstract:

Nowadays, we observe many efforts to deploy Next Generation Networks (NGN) architecture in operational telecommunication networks. Objectives of NGN are to replace legacy telephone networks and to support multimedia services as VoIP, IPTV, VoD, and broadband Internet. Multimedia services require to assure end-to-end quality of service (QoS) guarantees. These guarantees are related to data packet transfer (packet delay, jitter, losses) as well as call setup/release delay and they need an implementation of mechanisms and algorithms at both transport stratum and service stratum of the NGN architecture. ITU-T recommendations of the architecture and IETF specifications of signalling protocols allow to implement functional modules of comprehensive signalling system to support QoS guarantees in the network. However, there are no detailed recommendations neither of complete procedures in the signalling system of NGN architecture nor definitions of detailed admission control algorithms required to assure QoS parameters. Since 10 years researchers have worked on the above algorithms and procedures. And now, they focus also on next topic which is an evolution from NGN to Future Internet. The talk will cover the main aspects related to QoS guarantees in the evolution from PSTN to NGN, and to Future Internet. In particular, research topics of the talk will correspond to proposals of end-to-end classes of service and admission control algorithms for selected group of applications with strict QoS requirements. The talk will focus on both aspects of QoS guarantees: data transfer and signalling system. For data transfer, algorithms and performance evaluation for QoS guarantees for so called real time and non-real time multimedia applications will be presented. Taking into account signalling system, signalling procedures and their performance evaluation as well as signalling overload control mechanisms will be discussed.

Biography of speaker:

Halina Tarasiuk was born in Poland in 1972. She received Master's degree in computer science (Szczecin University of Technology) in 1996 and PhD degree in telecommunication (Warsaw University of Technology) in 2004. From 1998 she is with Telecommunication Network Technologies Group at the Institute of Telecommunications, Warsaw University of Technology. From 2004 she is assistant professor at the Warsaw University of Technology. From 1999 to 2003 she was collaborated with Polish Telecom R&D Centre. She was participated in COST 257, COST 279, 5FR IST-AQUILA (2000-2003), and 6FR IST-EuQoS (2004-2008) European projects working on quality of services guarantees in heterogeneous networks: architecture, signalling system, admission control algorithms, queueing systems. She also has been involved in several national projects supported by government as well as by telecom operators.  Current activities: Future Internet Engineering project (2010- ), polish national project partially funded by EU, leader of the group “IPv6 QoS Parallel Internet”.

Queues with dropping functions

Speaker:

Andrzej Chydzinski, Silesian University of Technology

Abstract:

We will deal with queueing systems in which a packet arriving to the queue is dropped with probability that depends on the queue size observed upon this packet arrival. The mapping of queue sizes into dropping probabilities is called "dropping function" and it can have any form. The analysis of such queues was initially motivated by the well-known RED algorithm, designed for the active queue management (AQM) in internet routers. The RED algorithm uses the linear dropping function, some other AQM schemes use different dropping functions. Apart from AQM applications, the queues with dropping functions have deep universal sense, as using the dropping functions we can control the loss ratio, throughput, queue size, queueing delay, queue size variance etc. These properties of queues with dropping function open up wide areas of application in traffic control.

The analytical results for the queues with dropping functions will be shown, including formulas for the queue size distribution, loss ratio and queueing delay. Then, several examples demonstrating ability to control the traffic using dropping functions will be provided. Finally, a summary of the future work and open problems will be given.

Biography of speaker:

Andrzej Chydzinski received his MS (in applied mathematics), PhD (in computer science) and DSc (in computer science) degrees from the Silesian University of Technology, Gliwice, Poland, in 1997, 2002 and 2008, respectively. He is currently a professor in the Institute of Informatics of this university. His academic interests are with computer networking, in particular with performance evaluation of computer networks, Future Internet, active queue management, mathematical modelling, queueing theory and discrete-event network simulators. Prof. Chydzinski authored and co-authored 3 books, about 40 conference papers and about 40 journal articles, including papers in widely recognized journals like Telecommunication Systems, Performance Evaluation, Pattern Recognition, Microprocessors and Microsystems, Queueing Systems, Stochastic Models, Mathematical Problems in Engineering, Applied Mathematical Modelling and other. He is also reviewing articles for high-quality journals and networking conferences. Prof. Chydzinski has been a leader of several scientific projects founded by Polish state and European Union. Since January 2011 he has been an IEEE Senior Member.

Modelling multi-service switching networks

Speaker:

Mariusz Głąbowski, Poznan University of Technology

Abstract:

Currently experienced increase in popularity of multimedia services indicates that in future networks the services that enable dynamic adjustment of admitted resources to the volume of available resources will be commonly and widely used. Services offered in present-day multi-service networks, both wired and wireless, that can adapt to the load of the networks, can be assigned to adaptive or elastic classes. The adaptive class allows for a decrease in admitted resources for new calls retaining, at the same time, their individual holding time. In the case of elastic class, along with an increase in the load of the system it is possible to decrease the volume of resources allocated to new calls with simultaneous extension of their holding time. The analysis of the effectiveness of resource allocation control algorithms in the case of elastic and adaptive services is based on the so-called threshold mechanisms. The group of resource management mechanisms includes also, for example, bandwidth reservation, compression mechanisms, traffic overflow.

Any resource management solutions adopted by the operators to counteract the growing congestion require performing appropriate traffic analyses of the operating network systems and their optimal dimensioning. Until recently, the main emphasis has been put on the traffic analysis of links between telecommunication nodes. Increased capacity of these links and the introduction of technically advanced traffic control mechanisms have effected, however, in a situation in which switching networks of the nodes have again become topical and relevant. The aim of the talk is to present analytical models of the multi-service switching networks with different resource and traffic control mechanisms. The presented models makes it possible to evaluate properly the traffic load in multi-service switching networks and their efficient dimensioning and optimization. The presentation will include the comparative study of the switching networks with different resource management mechanisms.

Biography of speaker:

Mariusz Głąbowski received the M. Sc., Ph. D. and D. Sc. (Habilitation) degrees in telecommunication from the Poznan University of Technology, Poland, in 1997, 2001, and 2010, respectively. Since 1997 he has been working in the Department of Electronics and Telecommunications, Poznan University of Technology. He is engaged in research and teaching in the area of performance analysis and modelling of multiservice networks and switching systems.

Prof. Mariusz Głąbowski is the author/co-author of 4 books, 7 book chapters and of over 100 papers which have been published in communication journals and presented at national and international conferences. He has refereed papers for many international conferences and magazines, including: IEEE Globecom, IEEE ICC, IEEE HPRS, IEEE Transactions on Communications, IEEE Communications Magazine, Computer Networks, IEEE Communications Letters, IEEE Transactions on Wireless Communications, Performance Evaluation, European Transactions on Telecommunications.

Prof. Mariusz Głąbowski is a Senior Member of Communications Society IEEE, a Member of Communications Society IEICE, and IARIA Fellow. He is also a vice-chair of the European Section of the IEICE.


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