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Proceedings Paper

Service models and realization of differentiated services networks
Author(s): Antonio Jose Elizondo; Maria L. Garcia Osma; Hans Joachim Einsiedler; Rudolf Roth; Michael I. Smirnov; Maurizio Bartoli; Paolo Castelli; Balazs Varga; Magnus Krampell
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Paper Abstract

Internet Service Providers need to offer Quality of Service (QoS) to fulfil the requirements of applications of their customers. Moreover, in a competitive market environment costs must be low. The selected service model must be effective and low in complexity, but it should still provide high quality and service differentiation, that the current Internet is not yet capable to support. The Differentiated Services (DiffServ) Architecture has been proposed for enabling a range of different Classes of Service (CoS). In the EURESCOM project P1006 several European service providers co-operated to examine various aspects involved in the introduction of service differentiation using the DiffServ approach. The project explored a set of service models for Expedited Forwarding (EF) and Assured Forwarding (AF) and identified requirements for network nodes. Besides, we addressed also measurement issues, charging and accounting issues. Special attention has been devoted to requirements of elastic traffic that adapts its sending rate to congestion state and available bandwidth. QoS mechanisms must prove Transmission Control Protocol (TCP) friendliness. TCP performance degrades under multiple losses. Since RED based queue management may still cause multiple discards, a modified marking scheme called Capped Leaky Bucket is proposed to improve the performance of elastic applications.

Paper Details

Date Published: 27 July 2001
PDF: 11 pages
Proc. SPIE 4524, Quality of Service over Next-Generation Data Networks, (27 July 2001); doi: 10.1117/12.434351
Show Author Affiliations
Antonio Jose Elizondo, Telefunica I&D (Spain)
Maria L. Garcia Osma, Telefunica I&D (Spain)
Hans Joachim Einsiedler, Deutsche Telekom (Germany)
Rudolf Roth, Deutsche Telekom (Germany)
Michael I. Smirnov, Deutsche Telekom (Germany)
Maurizio Bartoli, Ctr. Studi e Lab. Telecommunicazioni SpA (Italy)
Paolo Castelli, Ctr. Studi e Lab. Telecommunicazioni SpA (Italy)
Balazs Varga, MATAV (Hungary)
Magnus Krampell, Wireless Software Solutions (Sweden)

Published in SPIE Proceedings Vol. 4524:
Quality of Service over Next-Generation Data Networks
Mohammed Atiquzzaman; Mahbub Hassan, Editor(s)

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