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Ubiquitous Computing in Home Networks: A Global Architecture for Intelligent Systems

This article explores a comprehensive architecture for ubiquitous computing, emphasizing seamless communication between devices and their environments. It discusses the integration of multimedia resources, event-based interactions, and location-aware services that cater to user preferences. The intelligent end system architecture utilizes location sensing and resource management to facilitate enhanced user experience while prioritizing privacy. The CINEMA system exemplifies an implementation of this framework, showcasing its application in various contexts, such as hospitality, through SIP-based services.

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Ubiquitous Computing in Home Networks: A Global Architecture for Intelligent Systems

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  1. Ubiquitous Computing in Home Networks Henning Schulzrinne, Columbia University Stefan Berger, IBM Research IEEE Communication Magazine 2003

  2. E-E-E Everyone can communicate to EverythingEverywhere

  3. Ubiquitous Computing • Multimedia • Device integration • Event-based • Location-aware • Privacy-conscious • Invisible to user

  4. System Architecture • The context around the user • Location information • Multimedia resource • The intelligent end system the user hold • Retrieves the location and resource information • Transfers the information to SIP server • Control the resources

  5. Ubiquitous Computing System Architecture

  6. System Architecture • The core of the intelligent end system • Location sensing • Resource discovery and management • Call control

  7. Location Sensing • Self determines • GPS • Useless indoor • The field strength of wireless access point • Need two APs • Location beacon • Bluetooth • IR/RF • DHCP Server

  8. Location-Based Service • Triggers automated behavior • Selects watchers • Governs communication behavior

  9. Location-Based Service Two control mode • User centric • Selects the types of devices for witch the user has defined preference • Device centric • Device subscribe to user presence and store preference

  10. Resource Discovery and Control • Back-to-back user agent • A logical entity that receives a request and processes as a user agent server(UAS) • And acts a user agent server(UAC) to determine how to answer the request and generates requests

  11. Call Control Event-triggered actions • Received from the location sensing • Service discovery • Inbound or outbound call

  12. Control Messaging Using • SIP • Text-based message • XML • HTTP • Encode as URI parameter • SOAP(Simple Object Access Protocol) • More powerful • More complex

  13. Access Control • Explicitly registered to local server • RADIUS or DIAMETER (AAA) • Location information

  14. Prototype Implementation • The CINEMA system • Columbia InterNet Extensible Multimedia Architecture • SIP proxy, redirect, registration server(SIPD) • SIP voice mail • SIP conference service • Service logic execution environment(SLEE)

  15. Visited domain SIP-based ubiquitous computing in a hotel

  16. Conclusion • Presented a global-scale ubiquitous computing architecture • Based on standard SIP and SLP • Implementation CINEMA system

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