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Ubiquitous Computing in Home Networks. Henning Schulzrinne, Columbia University Stefan Berger, IBM Research IEEE Communication Magazine 2003. E - E - E. E veryone can communicate to E verything E verywhere. Ubiquitous Computing. Multimedia Device integration Event-based Location-aware

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ubiquitous computing in home networks

Ubiquitous Computing in Home Networks

Henning Schulzrinne, Columbia University Stefan Berger, IBM Research

IEEE Communication Magazine 2003

ubiquitous computing
Ubiquitous Computing
  • Multimedia
  • Device integration
  • Event-based
  • Location-aware
  • Privacy-conscious
  • Invisible to user
system architecture
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
system architecture1
System Architecture
  • The core of the intelligent end system
    • Location sensing
    • Resource discovery and management
    • Call control
location sensing
Location Sensing
  • Self determines
    • GPS
      • Useless indoor
    • The field strength of wireless access point
      • Need two APs
  • Location beacon
    • Bluetooth
    • IR/RF
    • DHCP Server
location based service
Location-Based Service
  • Triggers automated behavior
  • Selects watchers
  • Governs communication behavior
location based service1
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
resource discovery and control
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
call control
Call Control

Event-triggered actions

  • Received from the location sensing
  • Service discovery
  • Inbound or outbound call
control messaging using
Control Messaging Using
  • SIP
    • Text-based message
    • XML
  • HTTP
    • Encode as URI parameter
  • SOAP(Simple Object Access Protocol)
    • More powerful
    • More complex
access control
Access Control
  • Explicitly registered to local server
  • RADIUS or DIAMETER (AAA)
  • Location information
prototype implementation
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)
slide15

Visited domain

SIP-based ubiquitous computing in a hotel

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