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An Efficient On-line Frame Scheduling Algorithm for Video Conferences  

안성용 (조선대학교 전자계산학과)
이정아 (조선대학교 전자계산학)
심재홍 (조선대학교 인터넷소프트웨어공학부)
Publication Information
Journal of KIISE:Computer Systems and Theory / v.31, no.7, 2004 , pp. 387-396 More about this Journal
Abstract
In this paper, we propose an algorithm that distributes processor time to the tasks decoding encoded frames with a goal maximizing total QoS (quality of services) of video conference system. An encoded frame has such a characteristic that the QoS of recovered frame image also increases as the processor time given for decoding the frame gets to increase. Thus, the quality of decoded image for each frame can be represented as a QoS function of the amount of service time given to decode. In addition, every stream of video conference has close time-dependency between continuous frames belonging to the same stream. Based on the time-dependency and QoS functions, we propose an on-line frame scheduling algorithm which does not schedule all frames in the system but just a few frames while maximizing total QoS of video streams in the conference. The simulation results show that, as the system load gets to increase, the proposed algorithm compared to the existing EDF algorithm can reduce the quality of decoded frame images more smoothly and show the movements of conference attendees more naturally without short cutting.
Keywords
Video conference; quality of service; frame scheduling;
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Times Cited By KSCI : 1  (Citation Analysis)
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