METHOD AND SYSTEM FOR PERFORMING POSITION UPDATES IN A WIRELESS COMMUNICATION SYSTEM

• US 20100285816A1
• Filed: 05/11/2010
• Published: 11/11/2010
• Est. Priority Date: 05/11/2009
• Status: Active Grant

• Current Assignee: Semtech Corporation
• Original Assignee: Sierra Wireless Incorporated
• Inventors: Walton, Kevin, Vos, Gustav Gerald
• Granted Patent: US 8,494,551 B2
• Time in Patent Office: Days
• US Class Current: 455/456.1
• CPC Class Codes: H04W 60/04 using triggered events

Abstract

The present invention provides a method and system for performing position area updates in a wireless communication system configured to broadcast a plurality of position area codes, each associated with one of a plurality of position areas. The method comprises moving the wireless terminal from a first position area to a second position area; evaluating a predetermined condition; and performing the position area update when the predetermined condition is met.

Claims

1. A method for performing a position area update for a wireless terminal in a wireless communication system configured to broadcast a plurality of position area codes, each position area code associated with one of a plurality of position areas, the method comprising:

a. evaluating a predetermined condition upon movement of the wireless terminal from a first position area to a second position area; and

b. performing the position area update when the predetermined condition is met.

2. The method according to claim 1, further comprising the step of selecting the predetermined condition from a plurality of predetermined conditions, wherein the selecting is based at least in part on records of movement of the wireless terminal.

3. The method according to claim 2, wherein the selecting is performed in real time.

4. The method according to claim 2, further comprising recording times regarding movement from the first position area to the second position area in the records of movement.

5. The method according to claim 2, further comprising recording in the records of movement a first position area code associated with the first position area when moving from the first position area to the second position area.

6. The method according to claim 2, further comprising recording in the records of movement a second position area code associated with the second position area when moving from the first position area to the second position area.

7. The method according to claim 2, wherein the selecting is based at least in part on a predetermined statistical evaluation of the records of movement.

8. The method according to claim 2, wherein the selecting is performed by the wireless terminal.

9. The method according to claim 1, wherein the wireless communication system is further configured to broadcast a plurality of UMTS location area codes and the predetermined condition comprises evaluating if a first location area code received by the wireless terminal in the first position area differs from a second location area code received by the wireless terminal in the second position area.

10. The method according to claim 1, wherein the predetermined condition comprises evaluating if the wireless terminal has moved a predetermined number of position areas away from a position area defined during a last position area update.

11. The method according to claim 1, wherein the predetermined condition comprises evaluating if a first position area code received by the wireless terminal in the first position area and a second position area code received by the wireless terminal in the second position area differ in one or more predetermined bits.

12. The method according to claim 1, wherein the predetermined condition comprises evaluating if the first position area is included in a predetermined group of one or more first position areas and the second position area is included in a predetermined group of one or more second position areas.

13. The method according to claim 1, wherein the wireless communication system is further configured to broadcast a plurality of group position area codes and the predetermined condition comprises evaluating if a first group position area code received by the wireless terminal in the first position area differs from a second group position area code received by the wireless terminal in the second position area.

14. The method according to claim 1, wherein the wireless terminal is configured to receive mobile country codes and the predetermined condition comprises evaluating if a first mobile country code received by the wireless terminal in the first position area differs from a second mobile country code received by the wireless terminal in the second position area.

15. The method according to claim 1, wherein the wireless terminal is configured to receive mobile network codes and the predetermined condition comprises evaluating if a first mobile network code received by the wireless terminal in the first position area differs from a second mobile network code received by the wireless terminal in the second position area.

16. The method according to claim 1, wherein the predetermined condition is evaluated by the wireless terminal.

17. The method according to claim 1, wherein performing the position area update comprises transmitting to the wireless communication system a position area update message indicating a current position area corresponding to the second position area for association with the wireless terminal.

18. The method according to claim 17, wherein performing the position area update further comprises the wireless communication system retaining information about the current position area of the wireless terminal.

19. The method according to claim 18, wherein performing the position area update further comprises the wireless communication system generating and transmitting a position area update acknowledgement message.

20. A wireless communication system configured to broadcast a plurality of position area codes, each position area code associated with one of a plurality of position areas;

the wireless communication system including one or more wireless terminals and a wireless communication system backbone operatively coupled to the one or more wireless terminals;

the one or more wireless terminals and the wireless communication system backbone configured to perform a position area update when one or more of the wireless terminals move from a first position area to a second position area and a predetermined condition is met.

21. The wireless communication system according to claim 20 further configured to broadcast a plurality of UMTS location area codes and the predetermined condition comprises evaluating if a first location area code received by the wireless terminal in the first position area differs from a second location area code received by the wireless terminal in the second position area.

22. The wireless communication system according to claim 20, wherein the predetermined condition comprises evaluating if the wireless terminal has moved a predetermined number of position areas away from a position area defined during a last position area update.

23. The wireless communication system according to claim 20, wherein the predetermined condition comprises evaluating if a first position area code received by the wireless terminal in the first position area and a second position area code received by the wireless terminal in the second position area differ in one or more predetermined bits.

24. The wireless communication system according to claim 20, wherein the predetermined condition comprises evaluating if the first position area is included in a predetermined group of one or more first position areas and the second position area is included in a predetermined group of one or more second position areas.

25. The wireless communication system according to claim 20 further configured to broadcast a plurality of group position area codes and the predetermined condition comprises evaluating if a first group position area code received by the wireless terminal in the first position area differs from a second group position area code received by the wireless terminal in the second position area.

26. The wireless communication system according to claim 20, wherein each wireless terminal is configured to receive mobile country codes and the predetermined condition comprises evaluating if a first mobile country code received by the wireless terminal in the first position area differs from a second mobile country code received by the wireless terminal in the second position area.

27. The wireless communication system according to claim 20, wherein each wireless terminal is configured to receive mobile network codes and the predetermined condition comprises evaluating if a first mobile network code received by the wireless terminal in the first position area differs from a second mobile network code received by the wireless terminal in the second position area.

28. The wireless communication system according to claim 20, wherein the wireless communication system is configured as a universal mobile telephone system (UMTS).

29. The wireless communication system according to claim 28, wherein the position areas are routing areas.

30. The wireless communication system according to claim 20, wherein the wireless communication system is configured as a long term evolution (LTE) system.

31. The wireless communication system according to claim 30, wherein the position areas are tracking areas.

32. The wireless communication system according to claim 20, wherein paging of a wireless terminal comprises:

a. determining a last reported position area associated with a most recent position area update of the wireless terminal;

b. determining the predetermined condition associated with the wireless terminal;

c. determining, based at least in part on the last reported position area and the predetermined condition associated with the wireless terminal, one or more potential position areas in which the wireless terminal may reside; and

d. paging the wireless terminal within one or more of the potential position areas.

33. A wireless terminal for performing a position area update in a wireless communication system configured to broadcast a plurality of position area codes, each position area code associated with one of a plurality of position areas, the wireless terminal comprising:

a. a wireless communication system interface configured to communicate with the wireless communication system and to receive the position area codes; and

b. a control system operatively coupled to the wireless communication system interface and configured to evaluate a predetermined condition and to perform the position area update when the predetermined condition is met.