Tizen v2.3 Location Framework

1. Tizen v2.3 Location Framework

2. Introduction • Provides location based services(LBS) • Position information • Satellite information • GPS status • Based on GeoClue • http://freedesktop.org/wiki/Software/GeoClue/ • Features • Hybrid positioning solution(GPS, WPS, SPS) • Get the current position, last known position, distance & velocity • Get satellite information of GPS and GLONASS • Geo-fencing • Geocoding and reverse geocoding • Search POI(Point of interests), Calculate route

3. Location Framework Architecture Application Location Library Hybrid Positioning Map Service SPS POI WPS Route Geocode GPS GeoClue library Location component Kernel GeoClue providers Location Plug-in Remote Server Open Source SPS Plug-in GPS Plug-in WPS Plug-in Map Service Plug-in WPS Provider GPS Provider SPS Provider GPS Plug-in GPS Plug-in External Components Kernel (UART) libsoup libnetwork libxml2 libcurl Telephony Message Sensor GPS Receiver Map Service Server AGPS Server WPS Server

4. Location Components • Support vendor specific device’s plugin by shared library

5. Location Use Cases

6. How to Interact between Components

7. Positioning Technologies for Fast Position Fix • Wi-Fi and Cell-ID based positioning • Provide fast and accurate location to Wi-Fi capable devices in indoor and outdoor environment • Standard Assisted GPS(SUPL) • Communication between SET and SUPL server is transported over a secured IP connection • Predicted GPS • Extends the validity of assistance from 2-4 hours to 7 days. Assistance data is downloaded from a server • Self Assisted GPS • Mobile GPS clients generate assistance data without network connection

8. Comparison of Positioning Technologies

9. GeoClue • A software framework utilizing the D-Bus inter-process communication(IPC) mechanism to provide location information, and applications can use it to become geo-aware • Can geocode (getting a Position(longitude/latitude coordinate) from an Address) and reverse-geocode (getting an Address from a Position) • Licensed under the GNU LGPL

10. History & Goal • Started during GNOME Summit 2006 in Boston • Provides a convenient way to find out where the user is, from a number of sources such as GPS, GSM cell, WiFi network, internetwork • WiFi-based geolocation (accuracy: in meters) • GPS(A) receivers (accuracy: in centimeters) • 3G modems (accuracy: in kilometers, unless modem has GPS) • GeoIP (accuracy: city-level)

11. Examples GPS GSM IP address WiFi User tracking

12. Dependencies (1/2) • Gobject • Glib • D-Bus • GPSD • A GPS daemon on most Debian like system • http://gpsd.berlios.de • Gypsy • Written by lain Holmes at o-hand • A GPS multiplexing daemon which allows multiple clients to access GPS data from multiple GPS sources concurrently • http://gypsy.freedesktop.org/wiki/

13. Dependencies (2/2) • Wammu • A program to manage data in your cell phone such as contacts, calendar or messages • http://wammu.eu/ • OpenCellID (basement station ID) • Aiming to create a complete database of CellID worldwide, with their locations • http://opencellid.org/

14. Components (1/7) • A set of geoinformation interfaces • For querying “current situation” • Position • Address • Velocity • Use a method / signal architecture • Ex : To get current position, geoclue_position_get_position() method or “position-changed” signal with a callback function

15. Components (2/7) • Class of Interfaces • Position: GeocluePosition • Via gpsd, gypsy, hostip, plazes, gsmloc • Address: GeoclueAddress • Via hostip, plazes, manual, localnet • Velocity: Geocluevelocity • Via gpsd, gypsy • Geocode: GeoclueGeocode • Via nominatim (http://nominatim.openstreetmap.org/),geonames (http://www.geonames.org/), yahoo (http://developer.yahoo.com/maps/rest/V1/geocode.html) • ReverseGeocode: GeoclueReverseGeocode • Via nominatim, geonames • Accuracy: GeoclueAccuracy • Reports the horizontal and vertical accuracy levels

16. Components (3/7) • Provider • Implement more than one Geoclue interface • All Geoclue providers are D-Bus services • Do not have to run as daemons, as D-Bus will start them when needed (providers may also shut down when they’re no longer used)

17. Components (4/7) • Type of Providers http://www.freedesktop.org/wiki/Software/GeoClue/Providers/

18. Components (5/7) • Type of Providers

19. Components (6/7) • Problem on using Providers • A single provider cannot be the best solution to all problems • The “best” providers will be different depending on the user • Master Provider • Single window for user to use providers • It is an attempt to take away all of the complications of choosing the right provider • Choose the best provider to provide what you are looking for based on client requirements and provider availability, accuracy and resource requirements • The provider that is actually used may change over timeas conditions change, but the client can just ignore this

20. Components (7/7) • Usage of Master Provider • A typical Master provider use : • Getting a client-specific GeoclueMasterClient from GeoclueMaster • Setting GeoclueMasterClient requirements (such as accuracy) • Starting the wanted interfaces (such as Position) • Using the client just like a regular provider • Master provider is fairly new and may not be as stable as the rest of Geoclue

21. Example : Master Provider

22. Example : Master Provider

23. References • http://www.slideshare.net/wiliwe/geoclue-the-geolocation-service • http://www.freedesktop.org/wiki/Software/GeoClue/ • https://download.tizen.org/misc/media/conference2012/wednesday/ballroom-b/%202012-05-09_1145-1225-overview_of_tizen_location.pdf • Isaac K Adusei, K. Kyamakya, Klaus Jobmann, “Mobile Positioning Technologies in Cellular Networks: An Evaluation of their Performance Metrics”