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QoS of IP services in a fieldbus network: on the limitations and possible improvements
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This paper focuses on the problem of providing
efficient scheduling mechanisms for IP packets
encapsulated in the frames of a real-time fieldbus network
- the PROFIBUS. The approach described consists on a
dual-stack approach encompassing both the controlrelated
traffic ("native" fieldbus traffic) and the IPrelated
traffic. The overall goal is to maintain the hard
real-time guarantees of the control-related traffic, while
at the same time providing the desired quality of service
(QoS) to the coexistent IP applications. We start to
describe the work which have been up to now carried out
in the framework of the European project RFieldbus
(High Performance Wireless Fieldbus in Industrial
Multimedia-Related Environments - IST-1999-11316).
Then we identify its limitations and point out solutions
that are now being addressed out of the framework of the
above-mentioned European project.
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Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto.