Research On Grid Mobile Location Services And Its Key Techniques

The research on grid mobile location services comes from two requirements: On one hand, as a new value-added industry mode, mobile location services acquires more and more attentions, at the same time, one necessary technique is required to integrate all kinds of the heterogeneous resources in different places, including computation resource, storage resource and network resource, etc. On the other hand, in recent years, grid, as a strategetic infrastructure for high performance computation and information service, developed very fast and was being used to resource sharing and interoperability in different fields. Based on the requirements for resource integration of mobile location services and new applications for grid, grid mobile location services and its key technologies are studied in the paper, and the researches in the paper are the following.The background of grid mobile location services is analysed in detail. The research on theories, techniques and applications, involved in grid mobile location services, are presented detailedly. Based on the before-mentioned analysis, the research status quos of standards and specifications, techniques and applications are set forth. As far as the architecture for grid is concerned, three main architectures are presented in detail. They are, respectively, five tiers hourglass architecture, open grid services architecture and web services resource framework. Some related techniques: extensible markup language, the development platform for java, mobile communication, geographic information system and embedded geographic information system are presented in the paper. In addition, the necessity and feasibility that grid is used to form mobile location services are analyzed in detail.From the viewpoints of the theory for mobile location services, the theory for grid, system engineering and value chain, the tier for virtual user and virtual resource are produced, and are used to form grid mobile location services. On the basic of the tier for virtual user, virtual user object is presented. At the same time, on the basic of the tier for virtual resource, virtual service provider object, virtual data provider object for map, virtual location provider object and virtual terminal provider object are also presented. Furthermore, the conception model, overall framework, logical architecture, technique architecture and data architecture are formed eventually. Moreover, based on different functions in service applications and value chain, services-based six application modes and value chain-based three application modes are brought forward.The uniform location models: location conceptual model and location logical model are studied. The location features, properties for location features and relations for location features in location conceptual model are studied primarily. Location logical models for"PULL"and"PUSH", based on location conceptual model and different requests, are investigated; moreover, location logical flows for"PULL"and"PUSH"are also analyzed.Mobile location services oriented to metadata service, resource borker service and resource replication service are studied deep. The hierarchical core model, hierarchical functional model, hierarchical value chain model and hierarchical hybrid model for metadata service are proposed. In additional, the grid mobile location services based model for virtual processing resource broker and virtual storage resource broker are established; the grid mobile location services based architecture and service protocol stack for resource replication service are established.The architecture of grid mobile location services based on five tiers hourglass architecture is studied. The tier for foundation establishment, communication, single resource sharing, resource collection and application in it are designed primarily. According to the characteristics of grid services, the instance of bus navigation based on five tiers hourglass architecture and open grid service architecture in grid mobile location services are studied.In the end, a prototype system for mobile location services based on Java EE/Java ME is established. The client tier, middle tier and data tier and overall framework for the prototype system are designed and established. Several key techniques in the prototype system are analyzed and implemented. The service for point of interest, bus navigation service and bus query service are implemented.