Hierarchical QoS Concept for Multiprocessor

this paper, we provide a new QoS concept to be used in a large Network-on-Chip(NoC) setup for complex multimedia applications. The trend in video consumer systems is to use a heterogenous flexible platform in which many tasks are executed in parallel. For cost efficiency reasons, the platform cost and therefore resources are bounded, so that quality control of applications is inevitable. QoS management for Systems-on-Chip (SoCs) has been extensively studied for e.g. MPEG-4 3D graphics, wavelet coding, etc. [1] [2]. The proposed QoS management approach computes the resoure utilization as an algebraic function of the quality settings, based on e.g. the number of graphical triangles to be processed. However, in our target application domain, the execution time also depends on the input data. The input data dependency is particularly important for advanced multimedia applications, where video content is partitioned into independent video objects instead of rectangular frames of samples. As objects can change over time, in size, shape and texture contents, the processing requirements are more variable then with conventional video. For this reason we have adopted the MPEG-4 standard as an example of object oriented video processing. In this paper we consider a class of QoS systems that relies on predicting the execution times of the 1 Supported by the European Union via the Marie Curie Fellowship program under the project number HPMI-CT-20010015