Location-aware Computing

By Bonam Kim

Outline

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

Pioneering workCurrent techniques

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)

The first versionWith a unique five bit code The second version

With a ten bit code

The third, current versionWith a 48 bit code, bi-directional capabilities On-board 87C751

microprocessor

2. PARKTab (Location determination continue)

Xerox PARCTab, the first content-aware personal digital assistant

Current Techniques

E911 GPS Short-range radio

E911

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)

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

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.

GPS

Trimble GeoExplorer II The Casio Pathfinder GPS watch

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

Ericsson’s R520MBluetooth-enabled cell phone

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

DealFinder comMotion GITTCS

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

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)

Apply it to the Huntsville intermodal terminal Based on real time vehicle positioning

system using GPS Server/client system Wireless LAN

GITCS System Architecture

GPSReceiver

Real timeGPS data

Real Time GPSIntegrated Client System

DigitalMap

Message Tool

Real Time GPSIntegrated ServerSystem

Real TimeDisplay

Real TimeReplay

GPS Positioning dataCommunication

RecordedData

Real TimeDisplay

DigitalMap

Message Tool

Real Time Replay

GITCS Implementation

WLAN

5.Conclusion

This presentation provides a comparison of the technologies underlying most of the location-aware computer systems in use today.

Questions?