Using SIP for Ubiquitous Using SIP for Ubiquitous and Location-Based and Location-Based Communications 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
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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. - PowerPoint PPT Presentation
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Using SIP for Ubiquitous and Using SIP for Ubiquitous and Location-Based Location-Based
CommunicationsCommunications
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
OverviewOverview
What is ubiquitous computing? What is SIP? Location-based computing in SIP On-going work
Ubiquitous/pervasive Ubiquitous/pervasive computingcomputing 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
What are the core What are the core problems?problems?
Interested in multimedia communications ( Jason Nieh for computational mobility)
Moving and splitting sessions Locating services Event notification
What is SIP?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
Session mobilitySession 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
How to find services?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