Transcript Trafikanten

Presentasjon INF5261
Artikkelpresentasjon
Real-Time Bus Information
Paper subject
Real-time information to mobile
telephone
 Based on Geographical location
 Discussion on restrictions & solutions
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Technology
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Fleet of information: geographical
position, alarm notification…
Ex of system: MyBus – Intelligent
Transportation System to predict bus
departure times through the web
How about to move on to mobile devices?
Mobile, PDA…?
Restrictions: Minimum of functionality
conforming to mobile device(display,
ascii..)
Web Integration
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Use the existing internet protocols & standards
Sequence:
- Device send a message(url) – using wap
- Gateway is client, url to server- using http
- server generates result to client- using http
- Gateway back to device- using wap
Browsing:
- has wap-browser, like web-browser for url-transmission
- as html, wap has wml-language(subset of html) for
surfing + restrictions.
MyBus:
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Stimulus: stream of bus departure predictions
First was Metro King Country, Seattle,
Washington
Location as timepoint (map, area with several
timepoints), select, several routes listed.
Minimise display
Web site popular with requests.
WAP- Browser
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MyBus Wap site: necessary departure info with
physical restrictions
Mechanisms
Restrictions: nr of characters, Destination string
re-written. Add keys to reload and quit
Other problems:
- location identification with name
- location with numbers
- amount of data to download
Massive and increasing use
Wap-display
Web-display
Timepoint-choice
Conclusions
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Wap – switable device for receiving realtime info
Physical restrictions overcome through
interface-design
Try real-time for PDA, add data source in
algorithms, more condition data…