System of utilizing cell information to locate a wireless device

• US 7,672,675 B2
• Filed: 09/10/2002
• Issued: 03/02/2010
• Est. Priority Date: 09/10/2001
• Status: Expired due to Fees

• Current Assignee: CSR Technology Incorporated (Qualcomm, Inc.)
• Original Assignee: SIRF Technology Incorporated (Qualcomm, Inc.)
• Inventors: Garin, Lionel Jacques, Pande, Ashutosh
• Primary Examiner(s): Gary; Erika A
• Application Number:
  US10/489,225
• Publication Number:
  US 20040180670A1
• Time in Patent Office: 2,730 Days
• Field of Search: 455/456.1, 455/456.2, 455/456.5, 455/456.6, 455/457
• US Class Current: 455/456.1
• CPC Class Codes: G01S 19/06 employing an initial estimate of the location of the receiver as aiding data or in generating aiding data
• CPC Class Codes: G01S 19/252 Employing an initial estimate of location in generating assistance data
• CPC Class Codes: G01S 19/256 relating to timing, e.g. time of week, code phase, timing offset
• CPC Class Codes: G01S 5/02521 using a radio-map
• CPC Class Codes: H04M 2250/10 including a GPS signal receiver
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A system is described that utilizes the measured characteristics of a cell site or a plurality of cell sites (100, 102, 104) and the cellular identification to selectively provide a wireless device (118) with location aiding from a cellular network server (120). The system may include a basestation (106, 108, 110) located within the cell site, a cellular measurement unit located in the wireless device (118), and a database (214) containing positional assistance information corresponding to the characteristic information. The system may also include a processing unit in signal communication with the basestation and the database (214) and a positional determination unit in the wireless device (118).

Claims

1. A method for determining the approximate position of a wireless device, located within a cell of a cellular telephone network, utilizing a satellite position system, the method comprising:

transmitting to the wireless device a cellular identification of the cell;

receiving characteristic information of the cell from the wireless device, the characteristic information being distinct from the cellular identification of the cell, the characteristic information being determined by the wireless device in response to receipt of a signal such that the wireless device measures the signal and determines the characteristic information of the cell;

obtaining positional assistance information from a database when a location of the wireless device has not been derived, the positional assistance information corresponding to the received characteristic information and based at least partially on position data calculated from satellite position system processing; and

transmitting the positional assistance information to the wireless device.

2. The method of claim 1, further including:

receiving assisted positional information from the wireless device; and

updating the positional assistance information of the database corresponding to the received assisted positional information of the wireless device.

3. The method of claim 2, wherein the characteristic information includes the bit error rate.

4. The method of claim 2, wherein the characteristic information includes the signal levels.

5. The method of claim 2, wherein the characteristic information includes the propagation delay.

6. The method of claim 2, wherein the characteristic information includes the multi-path correction information.

7. The method of claim 1, wherein the position data on which the positional assistance information is at least partially based is calculated from satellite position system processing previously performed by the wireless device.

8. The method of claim 1, wherein the position data on which the positional assistance information is at least partially based is calculated from satellite position system processing previously performed by one or more mobile units independent of the wireless device.

9. A method for determining the approximate position of a second wireless device, located within a cell of a cellular telephone network, utilizing a satellite position system, the method comprising:

transmitting to the second wireless device a cellular identification of the cell;

receiving positional information of a first wireless device and first characteristic information of the cell from the first wireless device the first characteristic information being distinct from the cellular identification of the cell the positional information including data calculated from satellite position system processing;

creating a database of the positional information of the first wireless device and first characteristic information of the cell;

receiving second characteristic information of the cell from the second wireless device the second characteristic information being distinct from the cellular identification of the cell;

obtaining positional assistance information from the database, the positional assistance information corresponding to the received second characteristic information based on the first characteristic information; and

transmitting the positional assistance information to the second wireless device.

10. The method of claim 9, further including:

receiving assisted positional information from the second wireless device; and

updating the positional assistance information of the database corresponding to the received assisted positional information from the second wireless device.

11. The method of claim 10, wherein the characteristic information includes the bit error rate.

12. The method of claim 10, wherein the characteristic information includes the signal levels.

13. The method of claim 10, wherein the characteristic information includes the propagation delay.

14. The method of claim 10, wherein the characteristic information includes the multi-path correction information.

15. A method for determining the approximate position of a wireless device, located within a cell of a cellular telephone network, utilizing a satellite position system, the method comprising:

receiving a broadcast signal from a basestation, the broadcast signal including cellular identification of the cell;

transmitting to the basestation characteristic information of the cell the characteristic information being distinct from the cellular identification of the cell, the characteristic information being determined by the wireless device in response to receipt and measurement of the broadcast signal;

receiving from the basestation positional assistance information;

determining assisted positional information utilizing the satellite position system and the positional assistance information, when a location of the wireless device has not been derived; and

transmitting the assisted positional information to the basestation.

16. The method of claim 15, wherein the positional assistance information is obtained from a database.

17. The method of claim 16, further including updating the positional assistance information of the database corresponding to the transmitted assisted positional. information.

18. The method of claim 17, wherein the characteristic information includes the bit error rate.

19. The method of claim 17, wherein the characteristic information includes the signal levels.

20. The method of claim 17, wherein the characteristic information includes the propagation delay.

21. The method of claim 17, wherein the characteristic information includes the multi-path correction information.

22. The method of claim 15, wherein the positional assistance information received from the basestation is based at least partially on position data calculated from satellite position system processing previously performed by the wireless device.

23. The method of claim 15, wherein the positional assistance information received from the basestation is based at least partially on position data calculated from satellite position system processing previously performed by one or more mobile units independent of the wireless device.

24. A method for determining the approximate position of a wireless device, located within a cell of a cellular telephone network, utilizing a satellite position system, the method comprising:

transmitting a broadcast signal from a basestation to the wireless device, the broadcast signal including cellular identification of the cell;

receiving characteristic information of the cell from the wireless device, the characteristic information being distinct from the cellular identification of the cell, the characteristic information being determined by the wireless device in response to receipt and measurement of the broadest signal;

obtaining positional assistance information from a database, the positional assistance information corresponding to the received characteristic information;

transmitting the positional assistance information to the wireless device;

determining at the wireless device assisted positional information utilizing the satellite position system and the positional assistance information, when a location of the wireless device has not been derived; and

transmitting the assisted positional information to the basestation.

25. The method of claim 24, further including:

receiving the assisted positional information from the wireless device at the basestation; and

updating the positional assistance information of the database corresponding to the received assisted positional information of the wireless device.

26. The method of claim 25, wherein the characteristic information includes the bit error rate.

27. The method of claim 25, wherein the characteristic information includes the signal levels.

28. The method of claim 25, wherein the characteristic information includes the propagation delay.

29. The method of claim 25, wherein the characteristic information includes the multi-path correction information.

30. The method of claim 24, wherein the positional assistance information obtained from the database is based at least partially on position data calculated from satellite position system processing previously performed by the wireless device.

31. The method of claim 24, wherein the positional assistance information obtained from the database is based at least partially on position data calculated from satellite position system processing previously performed by one or more mobile units independent of the wireless device.

32. A system for determining the approximate position of a wireless device, located within a cell of a cellular telephone network, utilizing a satellite position system, the system comprising:

a basestation located within the cell, the basestation transmitting a broadcast signal to the wireless device;

a cellular measurement unit located in the wireless device, the cellular measurement unit capable of measuring characteristic information of the cell the characteristic information being distinct from cellular identification of the cell, the characteristic information being determined by the wireless device in response to receipt and measurement of the broadcast signal;

a database containing positional assistance information corresponding to the characteristic information;

a processing unit in signal communication with the basestation and the database, the processing unit capable of obtaining position assistance information from the database in response to the basestation receiving the characteristic information from the wireless device, when a location of the wireless device has not been derived; and

a positional determination unit in the wireless device, the positional determination unit capable of determining the position of the wireless device based on the utilization of the satellite position system and the positional assistance information.

33. The system of claim 32, wherein the positional assistance information contained in the database is based at least partially on position data calculated from satellite position system processing previously performed by the wireless device.

34. The system of claim 32, wherein the positional assistance information contained in the database is based at least partially on position data calculated from satellite position system processing previously performed by one or more mobile units independent of the wireless device.

35. A system for determining the approximate position of a wireless device, located within a cell of a cellular telephone network, utilizing a satellite position system, the system comprising:

means for transmitting a broadcast signal from a basestation to the wireless device, the broadcast signal including cellular identification of the cell;

means for receiving characteristic information of the cell from the wireless device the characteristic information being distinct from the cellular identification of the cell, the characteristic information being determined by the wireless device in response to receipt and measurement of the broadcast signal;

means for obtaining positional assistance information from a database when a location of the wireless device has not been derived, the positional assistance information corresponding to the received characteristic information;

means for transmitting the positional assistance information to the wireless device;

means for determining at the wireless device assisted positional information utilizing the satellite position system and the positional assistance information; and

means for transmitting the assisted positional information to the basestation.

36. The system of claim 35, wherein the positional assistance information obtained from the database is based at least partially on position data calculated from satellite position system processing previously performed by the wireless device.

37. The system of claim 35, wherein the positional assistance information obtained from the database is based at least partially on position data calculated from satellite position system processing previously performed by one or more mobile units independent of the wireless device.

38. A computer readable medium having software for determining the approximate position of a wireless device, located within a cell of a cellular telephone network, utilizing a satellite position system, the computer readable medium comprising:

logic configured for transmitting to the wireless device a cellular identification of the cell;

logic configured for receiving characteristic information of the cell from the wireless device the characteristic information being distinct from the cellular identification of the cell, the characteristic information being determined in response to receipt and measurement of a broadcast signal;

logic configured for obtaining positional assistance information from a database when a location of the wireless device has not been derived, the positional assistance information corresponding to the received characteristic information and based at least partially on position data calculated from satellite position system processing; and

logic configured for transmitting the positional assistance information to the wireless device.

39. The computer readable medium of claim 38, further including:

logic configured for receiving assisted positional information from the wireless device; and

logic configured for updating the positional assistance information of the database corresponding to the received assisted positional information of the wireless device.

40. The computer readable medium of claim 39, wherein the characteristic information includes the bit error rate.

41. The computer readable medium of claim 39, wherein the characteristic information includes the signal levels.

42. The computer readable medium of claim 39, wherein the characteristic information includes the propagation delay.

43. The computer readable medium of claim 39, wherein the characteristic information includes the multi-path correction information.

44. The computer readable medium of claim 38, wherein the positional assistance information obtained from the database is based at least partially on position data calculated from satellite position system processing previously performed by the wireless device.

45. The computer readable medium of claim 38, wherein the positional assistance information obtained from the database is based at least partially on position data calculated from satellite position system processing previously performed by one or more mobile units independent of the wireless device.