J. Jormakka, I. Grgic, and V. A. Siris
Telektronikk 97(2-3):269-286, 2001 (Special issue on Internet Traffic Engineering) Preprint: [pdf]
Abstract
IP-based networks and TCP/IP-applications are steadily getting more popular. Many applications require more than best-effort service, i.e. need Quality of Service (QoS) guarantees. Studies of customer expectations indicate that users would like service differentiation. Today's networks cannot support different requirements coming from different applications, since the methodology, mechanisms and their implementations are not yet mature. Some mechanisms assuring service differentiation and QoS support in IP-based networks are available, like the Integrated Services (IntServ) and the Differentiated Services (DiffServ) standardised by IETF, but it is not clear how to user these in order to deliver the service end-to-end with the quality agreed with a user. It is also not clear which parameters to use to express quality at the application service level, i.e. the quality the user can directly perceive. Moreover, mapping these parameters to network performance parameters is not a trivial task, and and charging for the quality provided is not in place. This paper presents results and findings related to the above issues that where investigated in the EURESCOM project P906-GI QUASIMODO (Quality of Service Methodologies and solutions within the service framework: Measuring, Managing, and Charging QoS).