1 / 20

Architecture for Context-Aware Services in Gaia

Architecture for Context-Aware Services in Gaia. Anand Ranganathan. Why context?. Situational information, or context, increases richness of communication in human-computer interaction Makes it possible to produce more useful computational services. Challenges in using context.

mary-beard
Download Presentation

Architecture for Context-Aware Services in Gaia

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Architecture for Context-Aware Services in Gaia Anand Ranganathan

  2. Why context? • Situational information, or context, increases richness of communication in human-computer interaction • Makes it possible to produce more useful computational services

  3. Challenges in using context • To develop a taxonomy and uniform representation of context types • Infrastructure to promote design , implementation and evolution of context-aware applications • Discovery of compelling context-aware applications • Issues of privacy and security

  4. Different types of context • Physical – Location, Time • Environmental – Weather, stock quotes, sports scores • Social – Activity, Individual & Group dynamics, Moods • Application – email, websites visited • System – network traffic, status of printers

  5. Context-Aware Apps • Context-Aware Planner • Context-Aware Ambience Generator

  6. Context-Aware Planner • Gives suggestions for an individual can plan out his activities • Uses context like: • Location • Time • Weather • Movie listings • Concert/Symphony timings • History of what he/she has done

  7. Context-Aware Planner- 2 • Group activities can be planned • Using social context between two or more people – like similar interests, relationship, etc. • Context-Aware Ambience Generator

  8. Context-Aware Ambience Generator • Based on moods of persons in room, social contexts, festivals, whether there’s a football game going on, etc. suitably changing the ambience of a room • Music, lighting, TV/radio

  9. Specifying context • Apps must be able to specify what type of context they want and in what format. • Context sensors must be able to send context to the apps. • Format should be flexible and extensible • Standardised?

  10. XML for specifying context • Apps to specify context they require • Context Type • App ID (UCR/IOR) • Real Time / History • Event based / Polling • Time to live • Format • Boolean expression (for notifications ) • Granularity / Reliability

  11. XML for specifying context –2 • Context sensors send apps their context • Context Type • Timestamp • SourceID (UCR) • Value of context

  12. What do context-aware apps want? • Contextual information in a format they can understand (eg in temp in C or F) • Want to be notified when a context they are interested in occurs (eg. When temp > 98 F) • Want to be able to poll or query certain types of context (eg. What is temp now?) • Want to access context history (how did temp change ?) • Don’t care about actual context sensor

  13. Infrastructure App App App Context Engine Context History Context Synthesizer Context Provider Context Provider Context Widget Context Widget Context Widget

  14. Context Widget • Actually senses the context • Eg. The Ibutton reader, RF badge basestation • Gets address of context provider(s) and sends it events

  15. Context Provider • Stores subscriptions of context consumers and sends them events • Apps can also query them • Can do some interpretation / translation of context from one form to another

  16. Context Engine • Similar to Trader Service • Context providers “advertise” the context they provide, the granularity, real-time/history, etc. with CE • Context consumers query CE for appropriate context.

  17. Context Synthesizers • Makes use of more than one context to give another contextual cue. • Eg. Deducing if a meeting is taking place based on no. of people, sound, whether there’s a powerpoint ppt. • Is a context consumer and context provider

  18. Context History • Databases that subscribe to contextual information • Keep recording specific contexts like the location of a person • Is also a context consumer + context producer

  19. More details • ContextProvider interface • GetContext(XMLFile) • GetContext(XMLFile, IOR) • ContextConsumer interface • SendContext(XMLFile)

  20. Future issues • Resolving ambiguous context • Where does privacy fit in?

More Related