Research On Middleware Supporting Quality Of Service In IP Network

Middleware supporting QoS is being developed for the demand of new traffics in the new network environment. Recently it becomes research field of several intersectional branches such as middleware technology and QoS technology. It also involves what kinds of technology should be used to support media-rich and real-time applications in the distributed environment. The research results in the paper shows that it is not enough only to rely on the QoS control in network to realize the service-level QoS guarantee, the QoS control and management in end systems is another indispensable key component; and the above concept, means, technology and schema are exposed in implementation of the middleware supporting QoS.Firstly, the basic technology of QoS control in IP network is presented. Then new development in Integrated Service and Differentiated Service is given. The architecture, representative service type and relative technology for them are fully analyzed. Finally the mechanism for QoS provision, which combines the Integrated Service and Differentiated Service together, and the further research works are given.To support the requirement for service-level end-to-end QoS guarantee, the middleware should realize resource management both in the end-systems and the network. It is proposed to use the global viewpoint to build a theoretical model for calling continuous media action. Based on this model, the dynamic resource management in end-system necessary for QoS control is analyzed, and some important conclusions are given. Then dynamic resource management strategies and algorithm in end-system are offered, and they are confirmed through a serial of test.The problem of QoS optimization for allocating resources among applications is studied. Obviously, such kind of optimization for apportioning finite resources to satisfy the QoS needs of multiple applications along multiple QoS dimensions is provably a NP-hard problem. A weighted based adaptive genetic algorithm isproposed which yields the near-optimal results in less computing time than the normal heuristic algorithm.The middleware supporting QoS is tough to construct because the parameters, their syntax, semantics and usage are not consistent among different specifications of QoS control and management, which are developed by diverse organizations. In order to solve the problems and establish a foundation for QoS supporting middleware system, QoS taxonomy is used to classify, in a generic fashion, the various facets of QoS parameters.CORBA is an important OMG specification. It has become the generally accepted tool for the implementations of heterogeneous distributed system. But what is regretted the specification of QoS guaranteed mechanisms is still not included in the recently version CORBA 3.0. In the paper, how to reform the traditional CORBA middleware and make it offer the contribution for QoS guarantee are fully discussed. Finally, a perfect new QoS-Driven CORBA is presented.