An Architecture for Location-Based Service Mobility Using the SIP Event Model

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An Architecture for Location-Based Service
Mobility Using the SIP Event Model

• Ron Shacham, Henning Schulzrinne
• Columbia University
• Wolfgang Kellerer, Srisakul Thakolsri
• Docomo Euro-Labs
• Mobisys 2004, Workshop on Context Awareness
• Boston, MA

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Overview

• Motivation In the future, people will use many
  communication devices, both personal (PDA, desk
  phone) and public (eg. workplace, hotel), that
  may be personalized
• Examples of personalization
• SIP Proxy and authorization settings
• Call logs
• Emergency numbers
• We present a SIP event-based architecture that
  configures and de-configures devices based on a
  users location and other context information

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Architectural Elements

• SIP Events are used by devices to access, update,
  and receive updates about user profiles
• SUBSCRIBE to profiles, and receive entire
  profiles and updates in NOTIFY messages
• PUBLISH is used to push local updates
• User location is determined and updated
• Location of user is determined by many sources
  (eg. swipe-card readers and mobile devices)
• Rooms have SIP URIs, and SIP REGISTER is used to
  update room presence

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Architectural Elements

• Enhanced Soft Phones receive room updates and
  user profiles to provide users their personalized
  services
• Hardware devices are handled by Device
  Controllers which
• Track user locations
• Access profile data
• Maintain an up-to-date view of device locations
  (SLP)
• Translate into native device format

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Architecture
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Context-based Configuration

• Device configuration based on
• User location
• Time and calendar info
• Type of location update
• Users specify policies through scripts that are
  executed upon users entrance into any room

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Summary

• SIP Events are used to provide user profiles on
  any device, whether private or public
• Configuration is based on user location and other
  context information, and may be controlled by the
  user
• A wide range of devices are supported

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Example Use
Conference Room
Lab
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Conference Room
Lab
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Conference Room
Configured
Lab
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Conference Room
Configured
Lab
12
Conference Room
Configured
Lab
I am in lab
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Example
Conference Room
Default
Lab
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Example
Conference Room
Lab
Redial