A CORBA-based quality of service management framework for distributed multimedia services and applications

For distributed multimedia services, it is essential that quality of servic e be guaranteed systemwide, including end systems, communication systems, a nd networks. Although many researchers have addressed issues of QoS managem ent, little attention has so far been paid to the QoS management services i n distributed multimedia services and applications. To address this deficie ncy, we have designed a layered model For end-to-end QoS management called the QoS management framework. Our framework, which is CORBA-based, includes a generic QoS MIB for the QoS parameterization of various multimedia servi ces and the services needed to perform various QoS functions. A key compone nt of this framework is the QoS Management Service Object, which orchestrat es resources at endpoints, coordinating resource management across layer bo undaries. Services such as translation, monitoring, admission, and negotiat ion are provided by the QMSO. To validate this concept, we have developed a QoS management system for managing and controlling the QoS of a distribute d multimedia system called MAESTRO. The QoS management system has been impl emented through CORBA objects and provides an interface to multimedia appli cations, which can be used For dynamic negotiation and renegotiation of QoS by users. Some performance results in QoS negotiation and renegotiation ar e also presented.