A Selection Andmaintenance Mechanism Of Ubiquitous Service

In recent year, intelligent terminal technology come to the peak time of development and the number of mobile phones and computing devices is rapidly increasing. In the meanwhile, near field communication, wireless technology and high bandwidth communication technology are advancing towards maturity gradually. Several terminals of one user or the cooperation with terminals of different users provide personalized ubiquitous service to single user that is a way to expand implementation capacity of a single device. In the future, depending on ubiquitous computing, sensor networks, wireless technology and service composition, ubiquitous services will become a platform that embeds the necessary terminals automatically to provide users with a context-aware, personalized, adaptive, predictable service. Ubiquitous network can offer intelligent personalized service. Ubiquitous service, meanwhile, has a lot of troubles in implementing with its specific features, such as so many personalized requirements, frequent topology changing with terminal mobility, limited resources and heterogeneity of terminals and the growing demand of service quality. These problems make extensive research value to solve the selection and maintenance of ubiquitous service. To ensure high service quality and sustainability of ubiquitous service is a key research direction.To find the solution to aggregate multiple terminals to realize a high quality service, in this paper, a layered overall architecture is established. Modeling, definition and mathematical model are built in abstract service, atom service and network layer. The solution is based on service quality evaluation model and isomorphism in graph theory. The core algorithm, multiple terminals synergy selection, is distributed and added stamp information-based pathfinder mechanism and time control window to improve the performance. The simulation results show that this algorithm can fast aggregate high quality executive terminals and ensure the high service quality and smoothness. Compared with two classical algorithms, algorithm in this paper is10%better in delay and reelections.To keep the sustainability of ubiquitous service and provide better user experience, this paper put the service quality and prolonging service time and reduces interruption in priority in the whole process. Therefore, this paper makes efforts in the following four aspects. First one is considering the synergetic effect between terminals to reduce the interruption. Second one is the real-time monitor mechanism during the execution to prevent interruption. Third one is the objective entropy evaluation method to update the weights on the basis of history ability to provide better parameters. Fourth one is the design with a context-aware mechanism to construct the structure of the ubiquitous service, that is to recover the atom service loss in the current environment and make a service and terminal twofold recovery mechanism.The selection and maintenance mechanism of ubiquitous service in this paper can construct the service and aggregate terminals to support the synergetic system with personalized content. It can adapt to the users requirements and the change of the topology in order to make the resources the most utility. It guarantees the high quality and sustainability of the ubiquitous service.