On the Specification of EtE QoS Control
J. B. Meer · 1997
Continuous media differ in their nature from discrete media, in that streams provide with a flat structure of data or even with loss of structure instead of single highly structured multi-typed discrete data units. Streams use simple communication concepts, since they are directed flows. Discrete media however, obey in most cases a complicated communication protocol. Streams are mass transportation vehicles, whereas discrete media cope with less mass of data but usually with more information about a state change of the communicating components. End-to-end control can be achieved by sensoring the effect of system activities and by feeding them back to the related input. Controlling signals will be issued when certain invariants of the system get violated. Models of which obey with components of a continuously operating system, a continuously sensoring and discretely decision-taking component. Whereas the continuous system is forward-oriented, the sensoring and decision-taking components are backwards. A synthesis of these two aspects provides with the basic end-to-end QoS control architecture.