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Ubiquitous Computing in Home Networks

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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