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Using SIP for Ubiquitous and Location-Based Communications

Using SIP for Ubiquitous and Location-Based Communications. Henning Schulzrinne (with Stefan Berger, Jonathan Lennox, Maria Papadopouli, Stelios Sidiroglou, Kundan Singh, Xiaotao Wu, Weibin Zhao) Columbia University IRT Lab CUCS Site Visit January 2003. Overview.

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Using SIP for Ubiquitous and Location-Based Communications

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  1. Using SIP for Ubiquitous and Location-Based Communications Henning Schulzrinne (with Stefan Berger, Jonathan Lennox, Maria Papadopouli, Stelios Sidiroglou, Kundan Singh, Xiaotao Wu, Weibin Zhao) Columbia University IRT Lab CUCS Site Visit January 2003

  2. Overview • What is ubiquitous computing? • What is SIP? • Location-based computing in SIP • On-going work

  3. Ubiquitous/pervasive computing • Computers embedded into the environment • Mobility, but not just cell phones • Computation and communications • Integration of devices • “borrow” capabilities found in the environment  composition into logical devices • seamless mobility  session mobility • adaptation to local capabilities • environment senses instead of explicit user interaction • from small dumb devices to PCs

  4. What are the core problems? • Interested in multimedia communications ( Jason Nieh for computational mobility) • Moving and splitting sessions • Locating services • Event notification

  5. What is SIP? • Session Initiation Protocol  protocol that establishes, manages (multimedia) sessions • also used for IM, presence & event notification • Developed at Columbia (with others) • Standardized by IETF, 3GPP (for 3G wireless), PacketCable • About 60 companies produce SIP products • Microsoft’s Windows Messenger (4.7) includes SIP

  6. Session mobility • Walk into office, switch from cell phone to desk phone • e.g., wall display + desk phone + PC for collaborative application • SIP third-party call control

  7. How to find services? • Two complementary developments: • smaller devices carried on user instead of stationary devices • devices that can be time-shared • Need to discover services in local environment • SLP (Service Location Protocol) allows querying for services • “find all color displays with at least XGA resolution” • CU SLP extensions for scalable, resilient discovery • Need to discover services before getting to environment • “is there a camera in the meeting room?” • CU SLP extension: find remote DA via DNS SRV

  8. Determining locations • For many devices, can’t afford hardware to determine location • Implementing BlueTooth-based location sensor networks • CU 7DS project: offer local content + location • Developing programmable active badges with IR and RF capabilities

  9. Location-based services “Alice has entered Room 700” CPL-based ruleset “WNYC” SIP-based messaging Make this Alice’s phone SIP-based event notification

  10. Location filtering language geo civil categorical properties 40.8N, 73.9W location-filtering language “EST” in train  only IM communication filtering “within 30’ of campus”

  11. Web server Columbia SIP servers (CINEMA) Telephone switch Local/long distance 1-212-5551212 rtspd: media server Quicktime Single machine RTSP sipconf: Conference server RTSP clients Department PBX sipum: Unified messaging Internal Telephone Extn: 7040 713x sipd: Proxy, redirect, registrar server SQL database SIP/PSTN Gateway Web based configuration SNMP (Network Management) Extn: 7134 H.323 Extn: 7136 siph323: SIP-H.323 translator NetMeeting xiaotaow@cs

  12. Pushing context-sensitive data to users • User with mobile device should get location information when entering city, campus or building • flight and gate information • maps and directions • local weather forecast • special advisories (“choose security checkpoint 2”) • Often does not require knowing user • but interface with (e.g.) calendar • Example Columbia implementation (7DS): • OBEX data exchange over BlueTooth • PDA pushes current appointment or event name • base station delivers directions and map

  13. Conclusion • SIP + auxiliary protocols supports many of the core requirements for ubiquitous computing and communications: • mobility modalities: terminal, user, session, service • service negotiation for devices with different capabilities • automatic configuration and discovery • event notification and triggered actions • automatic actions: event filtering, CPL, LESS • SIP offers a loosely-coupled approach • Also need data push functionality

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