ULg Research Unit in Networking RUN

From Best Effort to Enhanced QoS

A. Danthine1 and O. Bonaventure1

1 Research unit in Networking, EECS department, University of Liège, Belgium



The new communication environment has brought new requirements on the qualities of service for which the present "best effort" semantics is inadequate. The response to this evolution goes through the definition of a new model of QoS for the lower layers. In the "best effort" model, when a service provider accepts a transmission with a given QoS, it does not commit itself to any duty about the way it will take account of this QoS. The "guaranteed" QoS requires resources reservation mechanisms which are not always available. We present in this paper new negotiation rules and a new semantics for the QoS. It allows a service user to express more accurately its requirements and implies for the service provider an obligation of behaviour.


OSI95, QoS negociation, Quality of Service (QoS), transport service

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