"Qos Measures and Implementations Based on Various Models for Real-time Communications"

(by J. Ding, E. H.-M. Sha, and M. Kirkpatrick) in Proceedings of the 3rd IEEE Symposium on Application-Specific Systems and Software Engineering Technology, Richardson, Texas, March, 2000, pp. 106-110.



  Quality-of-Service(QoS) is a set of service requirements to be met by the network while transporting a data flow in real-time communication systems. Many real-time sources generate traffic with variable rates. In this paper, we studied a class of soft real-time applications whose bandwidth requirements are random variables. We defined two models for soft real-time communications: the dropping model and the keeping model. We measure the QoS of the whole system, not individual pplications. We defined three measures for the system's performance: system feasibility, packet transferability, and weighted packet transferability. Different scheduling algorithms are studied. Some related issues were also studied, such as queue size and gain functions. Finally we implemented a simulator and some typical simulation results and conclusions are presented.


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