Time: Wednesday 19.5.2004, 14:30
Place: Room A4-106, Fr. Bajersvej 7
The QoS (quality of service) of a service product perceived by
the end-user depends on the performance achieved by the components that
constitute that product as well as performance of the network and service
resources on which those components run. These resources may be spread
over many domains and owned by different network and service providers. In
this scenario, the end-to-end QoS will depend on overall performance
achieved by all the network and service components. Measuring performance
and analysing it to ascertain the end-to-end QoS is a challenging task and
the subject of this paper.
Much research work to date has overlooked the end-to-end service quality
issue while concentrating on the measurement and analysis of the
performance of IP-based networks. The work that does address service
quality issues does not relate to the work of standards bodies such as
3GPP (3rd Generation Partnership Project) and TMForum, IETF, and ITU-T,
which are developing a common framework for 3G service quality
measurements. This talk tackles this challenge by investigating a mapping
between QoS perceived by end-user onto performance of individual networks
and services in different domains, and relating this work to the work of
standards bodies. The key problem is explained and the mechanism to
measure network and service performance and transform it into end-to-end
service quality is discussed.
Novel aspects include an algorithm that transforms performance parameters
into service quality parameters as well as the detailed mapping of
performance parameters onto service quality parameters. Web-based services
will feature prominently in UMTS and so the end-to-end QoS scenario is
built around a web-based service. The mechanism is verified by
implementation and evaluation.