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QoS Management Scheme for Multimedia Applications in Best Effort Environments

Management schemes for multimedia applications typically fall into two categories. Those which rely on central manager to reserve resources for each application and those that use application based adaptation to deliver a reasonable quality of service in best eeort environments. The problems associated with these two approaches are discussed in this paper and some experiments have been done to study the behaviour of applications in best eeort environments. Therefore we have implemented two sample adaptive applications and given a generic description of how to build them. Our experiments about behaviour of adaptive applications show the undeterministic and unfair repartitioning of resources among these applications. This leads to the necessity of a central management scheme for these applications. We present a model for such a scheme and provide results to show its validity.