1. Location Based Reminding System
Jacob Christensen & Jai Modi

2. Basic Concept Reminding based on location Potential Consumer
A to do list of locations
“Next time I am at the grocery store, remind me to buy milk.”
Potential Consumer
The average, busy, forgetful person

3. Basic Scenario Add a location to device
Set a reminder for the location
When device is within range, reminder is given
Advantages
Use the location of user to trigger reminders
Some reminders are outside the context of time
Improvement to the common handheld organizer

4. Related Work Location Determination Place Lab
GPS (limited to outdoors)
Active IR tags (fine-grained indoors)
Others
Place Lab
Intel Research
Infrastructure exists: WiFi hotspots
Use this technology to build a reminding system using the context of location

5. Architecture Basic Components
Personal Server (Place Lab, Location Database)
Web Browser User Interface
Wrist Watch Display Mote
Personal
Server
Place Lab
Database
Display
Mote
Radio
Web
Browser
WiFi

6. Component Interaction
Web Browser <–> Personal Server
WiFi
Location management
Reminder management
Dynamic web interface
Personal Server <–> Display Mote
Radio
Signal reminders
Add locations

7. Web UI Design Manage Locations Manage Reminders Sample Page
Add/Remove locations
Interact with visual maps
Map coordinates -> latitude, longitude
Address -> latitude, longitude
Manage Reminders
Enable/Disable reminders
Set distance from location to remind
Define reminder priority (visual, audible alerts)
Custom reminder messages
Sample Page

8. Personal Server Design
Serve dynamic web interface pages over WiFi
Perl, PHP, C
Run Java application with Place Lab to get current location data and issue reminders
Maintain database of locations and reminders
MySQL, SQLite
Java Unknowns
Database Interaction
Radio Communication

9. Display Mote Design Limited Implementation Display Reminders
Help from another group working on text-entry
Worst case, put some text on the screen
Display Reminders
Acknowledge and remove reminder
Postpone until next time
Define Current Location
Requires text entry

10. Evaluation Performance Tests User Studies
Accuracy – precisely pinpoint locations
Reliability – reminders given correctly
User Studies
Is it any better than a sticky note, a PDA?
Is it easy to define locations and reminders?

11. Current Issues Problems User Interface Advice
Installations on Personal Server
MySQL, Perl Modules
Personal Server network behavior
User Interface Advice
Using maps effectively
Defining locations by addresses