Toward a Standard Ubiquitous Computing Framework

1
Toward a Standard Ubiquitous Computing Framework

• Martin Modahl
• Bikash Agarwalla
• Dr. Gregory Abowd
• Dr. Umakishore Ramachandran
• T. Scott Saponas

2
Motivation
Standard Framework?
3
Motivation

• Telephone Patch board Analogy
• Standard and Uniform, not necessarily Central
  interface

• Contributions
• A system infrastructure Taxonomy for UbiComp
  applications and mapping of existing tools using
  our Taxonomy

4
Outline

• Motivations
• Applications
• Taxonomy
• Conclusions and Future Work

5
Family Intercom Application

• Application Features
• Developed at Aware Home in Gatech
  (http//www.cc.gatech.edu/fce/ahri/)
• Multi-party communication
• Dynamic connections and Reconnections
• System
• Transport
• Audio Stream (MediaBroker - IEEE PerCom04)
• Control Information (UPnP)
• Location System (Abowd, G., A.
  Battestini, and T. O'Connell. "The
  Location Service A framework for handling
  multiple location sensing technologies".2002.
  Available at http//www.cc.gatech.edu/fce/ahri/pub
  lications/)
• Utilized the advantages of both UPnP as well as
  Media Broker !

6
Other Applications

• Sample Applications from Gatech
• TV Watcher (Technical Report GIT-CERCS-04-25),
  http//www.cc.gatech.edu/rama/ubiq-presence/
• Event Web (FTDCS04)
• Digital Family Portrait (CHI01)
• Common Taxonomy !

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Taxonomy
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Registration and Discovery

• Common to all other classes
• Used in many different ways
• Description Language and Discovery Protocol
• Examples SSDP, UDDI, WSDL, DNS, LDAP, Jini
  service discovery

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Data Storage and Streaming

• Provides multimedia data storage, transfer, and
  archival
• Examples MediaBroker(IEEE Percom04),
  D-Stampede(ICDCS02), GnuStream (Purdue), Coda
  (CMU)
• Comparison Metrics functionalities and QoS

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Service and Subscription

• Use of discrete messages
• Enable query and update of state information
• Push as well as Pull
• Examples UPnP, Jini, Event Heap (Stanford),
  Context-Toolkit (Gatech), Web Service

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Computation Sharing

• UbiComp applications offloading computation
  dynamically to HPC resources
• Examples Resource Management Systems in Grid
  (condor, legion, nimrod-g). MPI, PVM for clusters
• Dont support pervasive applications currently

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Context Management

• Includes
• Language to describe and discuss context
• Infrastructure to detect, update and query
  context
• Uses Data Storage and Streaming, Service and
  Subscription
• Examples Semantic Web Ontologies, Location
  Stack(UWash), Event Web (Gatech)

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Taxonomy Summary

• Some tools broadly fit into multiple categories!
• Taxonomy as a map of existing tools for building
  pervasive applications
• Taxonomy as a litmus test to evaluate features
  provided by a particular pervasive computing
  system

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Conclusions and Future Work

• Presented
• Taxonomy which can be used
• To evaluate future UbiComp middleware systems
• To enable modular implementation of UbiComp
  applications by integrating appropriate tools
• Future
• validate the taxonomy through complex
  infrastructure instantiation
• Understand the interaction and gap between
  different classes
• Evaluate performance trade offs

15
Questions?

• Thank You !
• Bikash Agarwalla
• bikash_at_cc.gatech.edu
• http//www.cc.gatech.edu/bikash