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THE QOS PROVISIONING SERVICE (QPS)

Middleware is a software infrastructure for distributed object systems that shields the heterogeneity and distributed nature of underlying software and hardware systems. Traditionally, middleware was used as a communication medium for client/server applications. However, the marketplace for middleware has changed significantly. Today it includes a growing number of QoS sensitive applications, such as distributed multimedia applications and distributed telecom management applications that typically have performance and availability demands. In order to support these QoS sensitive applications, system-specific QoS mechanisms such as OS scheduling and network bandwidth reservation need to be controlled. The middleware layer is a natural place for negotiation between QoS requirements of applications and the QoS capabilities of the underlying system, and to control system resources. However, this has to be done in a transparent manner in order to preserve the portability and interoperability of applications.