Method and System of Positioning

• US 20070254673A1
• Filed: 09/03/2003
• Published: 11/01/2007
• Est. Priority Date: 09/03/2003
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Alteir-Tuvesson, Johan, Bergenlid, Mikael, Stenberg, Per
• Application Number:
  US10/595,137
• Publication Number:
  US 20070254673A1
• Time in Patent Office: Days
• US Class Current: 455/456.100
• CPC Class Codes: G01S 5/0252 Radio frequency fingerprinting
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

The present invention relates to cellular mobile radio systems, particularly to systems of more than one co-sited cell/sector. A method and apparatus of satellite assistance for high accuracy positioning not requiring more terrestrial radio sites than one to be involved in positioning is disclosed.

Claims

1. A method of positioning a radio transmitter comprising

determining distance to a receiver of known position according to a parameter reflecting propagation delay time and

determining direction from the receiver to the transmitter from a respective at least one parameter reflecting received signal level in a cell/sector where the transmitter is camping or being served and signal level in a co-sited cell/sector, the parameter determining direction from stored assisting position data.

2. The method according to claim 1, wherein the assisting position data is classified in intervals of one or more parameters.

3. The method according to claim 2 wherein the position data in each interval is averaged over the interval of each of the one or more parameters.

4. The method according to claim 3 wherein the one or more parameters include received signal level.

5. The method according to claim 3 wherein the one or more parameters include timing advance.

6. The method according to claim 3 wherein the stored assisting position data is average position data.

7. The method according to claim 1 wherein the assisting position data is GPS or other satellite positioning system position data.

8. The method according to claim 7 further comprising, receiving the assisting position data from one or more of a plurality of subscriber receivers in a public mobile radio communication system.

9. The method according to claim 1 wherein the co-sited cell/sector is at least one of the cells/sectors being immediate neighbors of the cell where the transmitter is camping or being served.

10. The method according to claim 1 wherein direction to the transmitter is determined by forming a linear scale ratio of or dB-scale difference between the neighbor cell/sector received level and received level of the cell/sector where the transmitter is camping or being served.

11. The method according to claim 1 wherein determination of transmitter positioning includes cell/sector identity.

12. The method according to claim 1 wherein the received signal level is averaged prior to forming a basis for positioning.

13. The method according to claim 12 wherein the average is formed in a network control element.

14. The method according to claim 13 wherein the network control element is an entity most closely connected to the receiver entity over a standardized interface.

15. The method according to claim 14 wherein the entity most closely connected to the receiver is a base station controller.

16. The method according to claim 14 wherein the entity most closely connected to the receiver is a radio network controller.

17. A device for positioning a radio transmitter comprising:

processing means for determining;

distance to a receiver of known position according to at least one parameter reflecting propagation delay time;

direction from the receiver to the transmitter from a respective parameter reflecting received signal level in a cell/sector where the transmitter is camping or being served; and

signal level in a co-sited cell/sector, the respective parameter determining direction from stored assisting position data; and

storage means for storing of assisting position data in relation to the at least one parameter.

18. The device according to claim 17 wherein the assisting position data is classified in intervals of one or more parameters.

19. The device according to claim 18 further comprising processing means for averaging position data in each interval over the interval of each of the one or more parameters.

20. The device according to claim 19 wherein the one or more parameters include received signal level.

21. The device according to claim 19 wherein the one or more parameters include timing advance.

22. The device according to claim 19 wherein the stored assisting position data is average position data.

23. The device according to claim 17 wherein the assisting position data is GPS or other satellite positioning system position data.

24. The device according to claim 17, wherein for a public mobile radio communication system with a plurality of subscriber receivers, the assisting position data is received from one or more subscriber receivers.

25. The device according to claim 17 wherein the co-sited cell/sector is at least one of the cells/sectors being immediate neighbors of the cell where the transmitter is camping or being served.

26. The device according to claim 17 wherein direction to the transmitter is determined by forming a ratio of the neighbor cell/sector received level and received level of cell/sector where the transmitter is camping or being served.

27. The device according to claim 17 wherein the processing means further comprises including cell/sector identity determination of transmitter positioning.

28. The device according to claim 17 wherein the processing means further comprises forming a time average of received signal level prior to forming a basis for positioning.

29. The device according to claim 28 wherein the time average is formed in a network control element.

30. The device according to claim 29 wherein the network control element is an entity most closely connected to the receiver entity over a standardized interface.

31. The device according to claim 30 wherein the entity most closely connected to the receiver is a base station controller.

32. The device according to claim 30 wherein the entity most closely connected to the receiver is a radio network controller.

33-34. -34. (canceled)