UNCERTAINTIES OF SCHEDULING SYSTEM FOR MULTIMEDIA

K. Nahrstedt, J. Bajcsy

Abstract

Processing of multimedia applications in digital computing environments requires support of qualities, such as low jitter between video frames, known from current television or radio. This is especially difficult in these environments due to various noises coming from the hardware and software.<BR />In this paper we present (1) a novel scheduling software system for multimedia applications, (2) the measurement of quality parameters (e.g., skews, jitters) that are important for multimedia applications; and (3) evaluation of these measurements using uncertainties.<BR />Our Dynamic Soft Real Time scheduling software system(DSRT) allows us to minimize the noises and to guarantee desired quality of service (QoS) for multimedia applications. We measure the quality of multimedia applications running under the classical time sharing scheduling system and the DSRT system. Evaluation of these measurements is performed using metrological evaluation methods. These methods allow us to quantify the improvements of the DSRT system using uncertainties and to optimize its performance.

Keywords

multimedia applications, scheduling software, Quality of Service, metrological evaluation, measurement uncertainties

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