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U niversal Access Service Architecture for Mobile Devices in a Collaborative System

U niversal Access Service Architecture for Mobile Devices in a Collaborative System. MWCN`03 Singapore 28 October 2003. Sangyoon Oh Sunghoon Ko Geoffrey C. Fox PTLIU for Community Grids Lab. Indiana University, IN, USA. Outline. Introduction Idea

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U niversal Access Service Architecture for Mobile Devices in a Collaborative System

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  1. Universal Access Service Architecture for Mobile Devicesin a Collaborative System MWCN`03 Singapore 28 October 2003 Sangyoon Oh Sunghoon Ko Geoffrey C. Fox PTLIU for Community Grids Lab. Indiana University, IN, USA

  2. Outline • Introduction • Idea • Collaborative system and messaging system • Design Objects • Architecture • Future work • Conclusion

  3. Introduction • Importance of network-ready personal devices in collaborative systems is becoming apparent. • Mobile devices overcome physical constraint • Raise the degree of collaboration

  4. Idea • But integration of disparate devices is difficult • Limitations of computing power (CPU, memory, and display), connectivity (unstable and various network protocols) and developing environment (various OS) • A dedicated middleware architecture that supports universal access, event mapping, user management, and content adaptation

  5. Collaborative system • Collaborative Systems supports coordination and cooperation of two or more people who attempt to perform a task or solve a problem together • Sharing states (resource) • Examples: distance education, collaborative computing and building electric communities.

  6. Garnet Collaboration System • Garnet system • Uniform XML event (message) based architecture • All data structures defined in XML Schema Garnet XML Object Specification: GXOS • Build on publish/subscribe messaging model • customization to different client character • Support collaborative features : basic interactive features (textchat, whiteboard, etc.), shared resources (shared display, shared export), AV conferences • Grids (web) service interface: future

  7. NaradaBrokering • NaradaBrokering system • A distributed event service infrastructure developed for a large network of cooperating broker nodes • Supports publish-subscribe model for clients, JMS compliant

  8. Design Objects • Efficiency • Server side computing • Move computation to Server side • Deliver only vital parts of the message • Minimum computation on user device • Hand Held Message Service Protocol (HHMS) • Byte oriented event message • Contains topic type, application type, event type, and event data • Heterogeneity • Core concern of ubiquitous computing environment • Content adaptation • Transcoding: customize contents for limited capable mobile device • User Profile: GXOS based

  9. Pure Java: J2ME and J2SE ArchitectureOverview

  10. Architecture • Personal Server (PDA_Adaptor) • Content Adaptor • Connection Manager • Applications

  11. Architecture: Personal server and Content Adaptor • Personal server (PDA_Adaptor) • Main component • Manage user state: Create Content Adaptor Module and destroy it • Content adaptor • Responsible for processing adaptation of collaborative event message according to user profile • Each application has a process module in Content Adaptor

  12. Architecture: Connection Manager • Connection manager • TCP connection for WLAN device • HTTP Tunneling for Cellular phone • Tomcat Server + Servlet • Client polls to check incoming message • Servlet has a job queue for each client

  13. Architecture: Applications • Collaboration applications • Shared Display • sharing framebuffer among clients • Customizable picture size and resolution • SVG (Scalable Vector Graphics) • SVG module gets URL of SVG file and process it • Session Textchat • Instant Messenger • Instant messenger transport module connects Jabber open server to deliver a instant message and check presence (eXtensible Messaging and Presence Protocol: XMPP)

  14. SVG Demo (Snapshot)

  15. Shared Display Demo. (Snapshot)

  16. Textchat Demo. (Snapshot)

  17. Integrate with message broker (NaradaBrokering) Core functionality: NaradaBrokering Agent Content Adaptation: Web Service Future Work

  18. Conclusion • Pushing down more computing on the middleware layer and use efficient protocol between a mobile application and the middleware is suitable for many pervasive computing environment • Content Adaptation • Data processing • Event service • NaradaBrokering – HHMS protocols

  19. Relate URLs • Community Grids Lab • www.communitygrids.iu.edu • GMSME • grids.ucs.indiana.edu/ptliupages/hhms • NaradaBroker • www.naradabrokering.org • GXOS • www.gxos.org

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