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Seminars

QoS Routing in Broadband Networks: A Distributed Approach

Jose Marzo
University of Girona
Girona, Spain

Thursday, August 25, 2005
JEC 3117 - 4:00 p.m. to 5:00 p.m.
Refreshments at 3:30 p.m.

IP networks are based on the best effort model to transport traffic flows, yet this model cannot properly support the requirements of several emerging real time applications. Hence, some modifications in the network structure, mainly oriented to optimize network performance, are needed to provide Quality of Service (QoS) guarantees.
This talk presents an overview of main concepts and motivation for QoS routing in IP based networks in the context of the new high performance networking. Emerging Internet services such as Differentiated Services (Diffserv) and Multi-Protocol Label Switching (MPLS) are likely to both require and justify the need for QoS-based routing solutions.
A powerful routing mechanism that includes QoS attributes when selecting routes (QoS Routing) is also required. Most QoS routing algorithms select paths based on the information contained in the network state databases stored in the network nodes. Therefore, routing mechanisms must include an updating mechanism to guarantee that the network state information perfectly represents the current network state. Since network state changes (topology) are not produced very often, in conventional IP networks without QoS capabilities, most updating mechanisms are based on a periodic refresh. In contrast, in high performance networks a finer updating mechanism is needed.
Main goals of routing solutions are: satisfying the QoS requirements for every admitted connection and achieving global efficiency in resource utilization. It calls for QoS-sensitive scalable solutions for path selection, state dissemination, and topology aggregation.
Finally, two distributed approaches for QoS routing and bandwidth allocation are presented. The first is the routing algorithm based on ant colonies behavior which is an extension to the Antnet routing algorithm to provide QoS. The second is a multiagent system which provides fully distributed routing and resource allocation is addressed.

Biography: Jose L Marzo is an Associate Professor in the Electronics, Informatics and Automatics Department at the University of Girona, Girona, Spain. He received his Doctorate degree in Industrial Engineering from the University of Girona in 1997.
From 1978 to 1991 he was with "Telefonica de Espana", the main telephone operator in Spain. In Telefonica, Dr Jose L Marzo had different responsibilities in the Province of Girona, such as the head of the engineering department, or the head of the planning and programming office.
His current teaching includes graduate and post graduate level courses on operating systems, computer communication networks and performance evaluation of telecommunication systems.
His research interests are in the fields of management and performance evaluation of communication networks, network management based on intelligent agents, MPLS and GMPLS, and distributed simulation.
He leads a research group on broadband communications and distributed systems (BCDS) at the Informatics and Applications Institute (at the University of Girona). He has recently been involved in some European projects on teleteaching systems. He is currently the coordinator of the Spanish Network of Excellence in MPLS/GMPLS networks, which involves several Spanish institutions. He coordinated the participation of his research group in some national Spanish research projects.
Jose L Marzo is a member of the IEEE Communications Society. He has participated to the technical program committees and chairing sessions of several conferences, including SPECTS, IEEE Globecom and ICC. He serves on the editorial board of International Journal of Communications Systems.
He has co-authored several papers published in international journals and presented in leading international conferences.

Last updated: May 16, 2005



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