Research On Key Technology Of Dynamic Service Composition In Pervasive Computing

Pervasive computing emphasizes the compact relation between people and computing environment. It makes the computer and network themselves into the fabric of everyday life of people, and make people use the all kinds of service provided by network computing anytime, anywhere easily. The result of the development of computing technology is the disappearance of the computer. It is the current goal of pervasive computing that makes the new world of information service people oriented. With the increasing of pervasive computing devices, there are many devices that provide kinds of function more and more. The method is needed to compose the kinds of devices, which gives the new functions that the single device cannot give. Service composition is the process of making the complex service and new function from isolated, simple and exsiting services. It is very useful for effective using the system resource and reducing the complexity to design and implement the services by composing the complex services from the elementary services. The key technology of dynamic service composition in pervasive computing are proposed. The unified tranport network,the schema of elementary and composition service,the design and implementation of composition service engine,the control model of composition service are deeply researched. The key technologies of dynamic service composition is research from three proper order of transport protocol,the syntax and semantic presentation,the construct of service composition.The key technologies of dynamic service composition in pervasive computing and current research are studied.Then the transport management among all kinds of devices, which relizes the interconnection and intercommunication, is proposed. The transport management resolved the maping of the address from DeviceID to concreate address, the routing and interchange of multiple communication protocol and the unicast and multicast of interprocess.Semantic description resolves content sharing. The schema of elementary service based on semantic is proposed, which gives the base for the match of elementary services and automatic construct of service composition. The restricton of control flow and data flow guarantees the correctness and useability. It gives the theory...