METHOD AND SYSTEM FOR REFINING ACCURACY OF LOCATION POSITIONING

• US 20130079039A1
• Filed: 09/13/2012
• Published: 03/28/2013
• Est. Priority Date: 11/13/2008
• Status: Active Grant

• Current Assignee: Glopos FZC
• Original Assignee: Glopos FZC
• Inventors: Kuisma, Timo, Hietanen, Arno, Paananen, Jyrki, Jakorinne, Anssi, Heikkilae, Timo
• Granted Patent: US 8,554,247 B2
• Time in Patent Office: Days
• US Class Current: 455/456.6
• CPC Class Codes: G01S 19/14 specially adapted for specific applications
• CPC Class Codes: G01S 2205/008 using a mobile telephone network
• CPC Class Codes: G01S 5/0018 Transmission from mobile station to base station
• CPC Class Codes: G01S 5/0045 Transmission from base station to mobile station G01S5/009 takes precedence
• CPC Class Codes: G01S 5/0252 Radio frequency fingerprinting
• CPC Class Codes: H04W 4/025 using location based information parameters

Abstract

To accurately determine the location of mobile device a multi-phase procedure incorporating mapping and location determination phases is suggested, wherein covered area estimation comprises (i) estimation of base station location, (ii) estimation of transmission range, (iii) estimation of signal map and/or (iv) estimation of area type. The actual location of the mobile device (10) is determined from the covered area estimation based on relative comparison between the actual environment data and estimations (i)-(iv) and weight numbers resulted from the comparison. During the both phases a database is stored in server (14) and updated whenever new environment data is received. The vertical position, or ‘elevation’, of mobile device is further estimated based on vertical level information associated with the covered area estimations during the mapping phase.

Claims

1. A method for determining a location of a mobile device configured to receive and transmit further at least positioning data and wireless communication cell data, the method comprising

calculating for each of a plurality of cells a covered area estimation based on the received positioning data and the received cell data,

completing the covered area estimation with additional data associated to the received positioning data and the received cell data, wherein the additional data represents at least a shape of the covered area estimation, and wherein the covered area estimation incorporates vertical level information,

receiving further actual cell data and relatively comparing the actual cell data to the cell data of the covered area estimation of each of the plurality of cells,

selecting at least one cell from the plurality of cells having the actual cell data that matches to the cell data of the covered area estimation, and

calculating the location of the mobile device through the utilization of the positioning data of the covered area estimation of each selected cell, wherein an estimate of the vertical position of the mobile device is further determined.

2. The method according to claim 1, wherein said positioning data includes vertical level information.

3. The method according to claim 1, wherein said additional data comprises vertical level information.

4. The method according to claim 1, wherein the vertical level information is based on satellite positioning data, optionally GPS (Global Positioning System) or GLONASS (Global Navigation Satellite System) data.

5. The method according to claim 1, wherein covered area estimations are established relative to a plurality of different wireless network technologies and the location of the mobile device is determined utilizing at least two covered area estimations of different wireless network technology.

6. The method according to claim 1, wherein covered area estimations are established relative to a plurality of different wireless network technologies and the location of the mobile device is determined utilizing at least two covered area estimations of different wireless network technology, and further wherein said plurality of wireless network technologies includes at least one cellular phone network of first technology and wireless LAN (local area) network or one other cellular phone network of second technology.

7. The method according to claim 1, wherein the actual cell data substantially consists of data provided in a network measurement report.

8. The method according to claim 1, wherein the actual cell data substantially consists of data provided in a network measurement report, and further wherein based on data provided in the report matching cells are determined and the position of the mobile device calculated.

9. The method according to claim 1, wherein the movement of the mobile device is profiled to increase the positioning accuracy utilizing a recursive filter or estimator, optionally Kalman filter or estimator.

10. The method according to claim 1, wherein completing comprises updating the cell data of the covered area estimation with the additional data that relates to the shape of the covered area estimation based on probability of signal strength within each of the plurality of cells.

11. The method according to claim 1, wherein calculating the covered area estimation comprises calculating a location of a transmitting base station of each cell.

12. The method according to claim 1, comprising dividing each of the plurality of cells into sector areas and calculating for each sector area a sector formula representing signal strength levels inside the sector area and accumulating the covered area estimation from the sector formulas.

13. The method according to claim 1, wherein calculating the covered area estimation comprises calculating a transmission range of a transmitting base station of each cell.

14. The method according to claim 1, wherein calculating the covered area estimation comprises calculating a size and shape of each cell based on at least one of the following cell data:

radio frequency, absolute radio frequency channel number, receiver signal strength and timing advance.

15. The method according to claim 1, wherein the environment data includes information on signal loss over various ranges, number of base stations and type of base stations.

16. The method according to claim 1, wherein the additional data includes at least one of the following information relating to cell identification, mobile area code, location area code, mobile country code, global or operator specific information.

17. The method according to claim 1, wherein the additional information relates to at least one of the following information received from databases:

population density, land topography and city size.

18. A system for determining a location of a mobile device, wherein

the mobile device is configured to collect and transmit further at least positioning data and wireless communication cell data received from a plurality of base station belonging to at least one cellular network,

a server is configured to receive and store the positioning data and the cell data of each of the plurality of base stations associated to the position data,

the server is configured to calculate for each of the plurality of base stations a covered area estimation based on the positioning data and the cell data,

the server is configured to complete the covered area estimation with additional data associated to the received position data and the received cell data, wherein the additional data represents at least a shape of the covered area estimation, and wherein the covered area estimation incorporates vertical level information,

the server is configured to further receive the cell data and the processor is configured to relatively compare the actual cell data to the cell data of the covered area estimation of each of the plurality of base stations,

the server is configured to select at least one base station from the plurality of base stations having the actual cell data that matches to the cell data of the covered area estimation,

the server is configured to calculate the location of the mobile device from the positioning data of the covered area estimation of each selected at least one base station, wherein the location comprises an estimate of the vertical position of the mobile device, and

the server configured to transmit further the location of the mobile device.

19. The system according to claim 18, wherein the server is configured to complete the cell data of the covered area estimation with the additional data that relates to the shape of the covered area estimation based on probability of signal strength within each of the plurality of cells.

20. The system according to claim 18, wherein the server is configured to calculate a location of a transmitting base station of each cell.

21. The system according to claim 18, wherein the server is configured to divide each of the plurality of cells into sector areas and calculate for each sector area a sector formula representing signal strength levels inside the sector area and accumulate the covered area estimation from the sector formulas.

22. The system according to claim 18, wherein the server is configured to

calculate for each of a plurality of cells a covered area model based on received positioning data and received cell data,

calculate location information based on the received positioning data and the calculated covered area model,

receive further actual positioning data and compare the calculated location information with the received actual positioning data,

complete the covered area model with additional data associated to the received position data and the received cell data, wherein the additional data represents at least a shape of the covered area estimation, and

transmit the completed covered area model into a database for storing.

23. A module for determining a location of a mobile device configured to receive and transmit further at least positioning data and wireless communication cell data, the module comprising

a receiver configured to receive and a memory configured to store the positioning data and the cell data of each of the plurality of base stations associated to the position data,

an estimator configured to calculate for each of the plurality of base stations a covered area estimation based on the positioning data and the cell data,

a modeler configured to complete the covered area estimation with additional data associated to the received position data and the received cell data, wherein the additional data represents at least a shape of the covered area estimation, and wherein the covered area estimation incorporates vertical level information,

a locator configured to further receive actual cell data,

the estimator configured to relatively compare the actual cell data to the cell data of the covered area estimation of each of the plurality of base stations,

a selector configured to select at least one base station from the plurality of base stations having the actual cell data that matches to the cell data of the covered area estimation, and

the locator configured to calculate the location of the mobile device from the positioning data of the covered area estimation of each selected at least one base station, wherein the location comprises an estimate of the vertical position of the mobile device.

24. The module according to claim 23, wherein

the modeler is configured to complete the cell data of the covered area estimation with the additional data that relates to the shape of the covered area estimation based on probability of signal strength within each of the plurality of cells.

25. The module according to claim 23, wherein the modeler is configured to calculate a location of a transmitting base station of each cell.

26. The module according to claim 23, wherein the modeler is configured to divide each of the plurality of cells into sector areas and calculate for each sector area a sector formula representing signal strength levels inside the sector area and accumulate the covered area estimation from the sector formulas.

27. A mobile device operable in at least one wireless communications network, comprising

a model database containing a covered area estimation regarding a plurality of base stations of the at least one network, wherein the covered area estimation associates cell data with positioning data and indicates the shape of the covered area, further incorporating vertical level information, and

a locator configured to receive cell data and further configured to relatively compare the received cell data to the cell data of the covered area estimation of each of the plurality of base stations, to select at least one base station from the plurality of base stations with matching cell data, and to calculate the location of the mobile device from the positioning data of the covered area estimation of each selected at least one base station, wherein the location comprises an estimate of the vertical position of the mobile device.