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Location-aware Computing - PowerPoint PPT Presentation

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Location-aware Computing. By Bonam Kim. Outline. Introduction Motivation Location Determination Techniques Location-aware Services Example for Implementation Conclusion. 1.Introduction.

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Location-aware Computing

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Presentation Transcript
  • Introduction
  • Motivation
  • Location Determination Techniques
  • Location-aware Services
  • Example for Implementation
  • Conclusion
1 introduction
  • A key aspect for the mobility of these applications is given by the ability to determine the user’s location.
  • Location-aware services allow to offer value-added service to the user, depending on their current geographic position.
2 motivation
  • Location-aware services are becoming a key feature to provide tailor-made applications in wireless networks
  • Due to new and improved features of mobile devices and applications, the mobile markets in the past few years have seen a remarkable boom
  • Mobile application will continue to form an important and expanding industry in the future.
3 location determination techniques
3.Location determination techniques
  • Pioneering work
  • Current techniques
pioneering work location determination continue
Pioneering work (Location determination continue)
  • Active Badge

1. designed and prototyped between 1989 and 1992.

2. The first location-based application in computer science literature

  • PARCTab

1. development since 1992

2. the first location-based applications on a PDA- class device

1 active badge location determination continue
1. Active Badge (Location determination continue)

The third, current version

With a 48 bit code, bi-directional capabilities

On-board 87C751


The first version

With a unique five bit code

The second version

With a ten bit code

2 parktab location determination continue
2. PARKTab (Location determination continue)
  • Xerox PARCTab, the first content-aware personal digital assistant
current techniques
Current Techniques
  • E911
  • GPS
  • Short-range radio
  • Selective Routing (SR)

Routes 911 emergency calls to the proper Public Safety Answering

Point (PSAP) based on the emergency service number assigned to the caller’s address.

  • Automatic Number Identification (ANI)

Provides the calling party’s seven digit telephone number on the display at the PSAP.

  • Automatic Location Identification (ALI)

Provides the name and address associated with the calling party’s telephone number on the display at the PSAP.

e911 enhanced 911
E911 (Enhanced 911)

The Belmont County, Ohio, Enhanced 9-1-1 Communications Center

gps global positioning system
GPS (Global Positioning System)
  • The most popular option of obtaining location information today.
  • GPS lets suitably equipped receivers determine their position within 10 meters.
  • It is generally not workable indoors.

The Casio Pathfinder GPS watch

Trimble GeoExplorer II

short range radio
Short-range radio
  • Bluetooth location-based services
  • Bluetooth is a specification for a small-form factor, low-cost radio solution providing links between mobile computers, mobile phones and other portable handheld devices, and connectivity to the internet.
bluetooth short range radio
Bluetooth short-range radio

Ericsson’s R520M

Bluetooth-enabled cell phone

wireless gps bluetooth receiver for mobile terminals
Wireless GPS/Bluetooth Receiver for Mobile Terminals

The world’s first integrated Bluetooth wireless

and GPS receiver one for mobile devices

4 location aware services
4.Location-aware Services
  • DealFinder
  • comMotion
dealfinder mobil shopping guide
DealFinder: Mobil Shopping Guide
  • A position-aware shopping application for mobile devices
  • Share information about product prices and availability
  • For instance

a person comparison-shopping for television sets at different local electronic stores can use DealFinder to “upload” prices to our public database. Other shoppers who will are looking for a similar television set will be able to find prices on TV sets, based on their location.

  • comMotion gradually learns about the location in its user’s daily life based on travel patterns.
  • GPS position sensing
  • Map display and graphical user interface
  • comMotion can provide maps showing the user’s current position together with neighbourhood lacales such as banks, movie theatres or grocery stores.
gitcs ground intermodal traffic control system
GITCS (Ground Intermodal Traffic control system)
  • Apply it to the Huntsville intermodal terminal
  • Based on real time vehicle positioning system using GPS
  • Server/client system
  • Wireless LAN
gitcs system architecture



Message Tool





Message Tool

Real time

GPS data

GPS Positioning data


Real Time GPS

Integrated Server


Real Time GPS

Integrated Client System



Real Time


Real Time Replay

Real Time


Real Time


GITCS System Architecture
5 conclusion
  • This presentation provides a comparison of the technologies underlying most of the location-aware computer systems in use today.