Title :
QoS measures and implementations based on various models for real-time communications
Author :
Ding, Jiangfeng ; Kirkpatrick, Michael ; Sha, Edwin H M
Author_Institution :
Dept. of Comput. Sci. & Eng., Notre Dame Univ., IN, USA
Abstract :
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. 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 applications. 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
Keywords :
computer network management; performance evaluation; quality of service; real-time systems; scheduling; telecommunication traffic; QoS measures; bandwidth requirements; dropping model; gain functions; keeping model; packet transferability; quality of service; queue size; random variables; real-time communications; scheduling algorithms; service requirements; simulation; system feasibility; system performance; variable rate traffic; weighted packet transferability; Bandwidth; Computer science; Data engineering; Intelligent networks; Multimedia systems; Quality of service; Random variables; Real time systems; Traffic control; Videoconference;
Conference_Titel :
Application-Specific Systems and Software Engineering Technology, 2000. Proceedings. 3rd IEEE Symposium on
Conference_Location :
Richardson, TX
Print_ISBN :
0-7695-0559-7
DOI :
10.1109/ASSET.2000.888065
