METHODS AND APPARATUS FOR MEASURING ROUND-TRIP DELAY AT A MOBILE STATION

• US 20090247087A1
• Filed: 03/26/2008
• Published: 10/01/2009
• Est. Priority Date: 03/26/2008
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Lee, Kuo-Chun, Chin, Tom
• Application Number:
  US12/056,222
• Publication Number:
  US 20090247087A1
• Time in Patent Office: Days
• US Class Current: 455/67.140
• CPC Class Codes: H04W 56/009 Closed loop measurements

Abstract

A method for measuring round-trip delay at a mobile station may include determining a first time difference between two different types of frames at a base station. The method may also include determining a second time difference between the two different types of frames at a mobile station. The method may also include calculating the round-trip delay based on the first time difference and the second time difference.

Claims

1. A method for measuring round-trip delay, the method being implemented by a mobile station, the method comprising:

determining a first time difference between two different types of frames at a base station;

determining a second time difference between the two different types of frames at a mobile station; and

calculating the round-trip delay based on the first time difference and the second time difference.

2. The method of claim 1, wherein the first time difference is a transmit/receive transition gap at the base station (TTG), and wherein the second time difference is a transmit/receive transition gap at the mobile station (TTG_MS).

3. The method of claim 2, wherein the round-trip delay is calculated as TTG−

TTG_MS.

4. The method of claim 1, wherein the first time difference is a receive/transmit transition gap at the base station (RTG), and wherein the second time difference is a receive/transmit transition gap at the mobile station (RTG_MS).

5. The method of claim 4, wherein the round-trip delay is calculated as RTG_MS−

RTG.

6. The method of claim 1, further comprising calibrating uplink transmission timing.

7. The method of claim 1, further comprising:

determining a timing shift of a downlink frame since a previous uplink timing calibration; and

accounting for the timing shift in the calculation of the round-trip delay.

8. The method of claim 2, wherein the round-trip delay is calculated as TTG−

TTG_MS+D, and wherein D is a timing shift of a downlink frame since a previous uplink timing calibration.

9. The method of claim 4, wherein the round-trip delay is calculated as RTG_MS−

RTG+D, and wherein D is a timing shift of a downlink frame since a previous uplink timing calibration.

10. The method of claim 1, wherein the mobile station is configured to communicate via a wireless communication network that supports an Institute of Electronic and Electrical Engineers (IEEE) 802.16 standard.

11. A mobile station that measures round-trip delay, comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable to;

determine a first time difference between two different types of frames at a base station;

determine a second time difference between the two different types of frames at a mobile station; and

calculate the round-trip delay based on the first time difference and the second time difference.

12. The mobile station of claim 11, wherein the first time difference is a transmit/receive transition gap at the base station (TTG), and wherein the second time difference is a transmit/receive transition gap at the mobile station (TTG_MS).

13. The mobile station of claim 12, wherein the round-trip delay is calculated as TTG−

TTG_MS.

14. The mobile station of claim 11, wherein the first time difference is a receive/transmit transition gap at the base station (RTG), and wherein the second time difference is a receive/transmit transition gap at the mobile station (RTG_MS).

15. The mobile station of claim 14, wherein the round-trip delay is calculated as RTG_MS−

RTG.

16. The mobile station of claim 11, wherein the instructions are further executable to calibrate uplink transmission timing.

17. The mobile station of claim 11, wherein the instructions are further executable to:

determine a timing shift of a downlink frame since a previous uplink timing calibration; and

account for the timing shift in the calculation of the round-trip delay.

18. The mobile station of claim 12, wherein the round-trip delay is calculated as TTG−

TTG_MS+D, and wherein D is a timing shift of a downlink frame since a previous uplink timing calibration.

19. The mobile station of claim 14, wherein the round-trip delay is calculated as RTG_MS−

RTG+D, and wherein D is a timing shift of a downlink frame since a previous uplink timing calibration.

20. The mobile station of claim 11, wherein the mobile station is configured to communicate via a wireless communication network that supports an Institute of Electronic and Electrical Engineers (IEEE) 802.16 standard.

21. A mobile station for measuring round-trip delay, comprising:

means for determining a first time difference between two different types of frames at a base station;

means for determining a second time difference between the two different types of frames at a mobile station; and

means for calculating the round-trip delay based on the first time difference and the second time difference.

22. The mobile station of claim 21, wherein the first time difference is a transmit/receive transition gap at the base station (TTG), and wherein the second time difference is a transmit/receive transition gap at the mobile station (TTG_MS).

23. The mobile station of claim 22, wherein the round-trip delay is calculated as TTG−

TTG_MS.

24. The mobile station of claim 21, wherein the first time difference is a receive/transmit transition gap at the base station (RTG), and wherein the second time difference is a receive/transmit transition gap at the mobile station (RTG_MS).

25. The mobile station of claim 24, wherein the round-trip delay is calculated as RTG_MS−

RTG.

26. The mobile station of claim 21, further comprising means for calibrating uplink transmission timing.

27. The mobile station of claim 21, further comprising:

means for determining a timing shift of a downlink frame since a previous uplink timing calibration; and

means for accounting for the timing shift in the calculation of the round-trip delay.

28. The mobile station of claim 22, wherein the round-trip delay is calculated as TTG−

TTG_MS+D, and wherein D is a timing shift of a downlink frame since a previous uplink timing calibration.

29. The mobile station of claim 24, wherein the round-trip delay is calculated as RTG_MS−

RTG+D, and wherein D is a timing shift of a downlink frame since a previous uplink timing calibration.

30. The mobile station of claim 21, wherein the mobile station is configured to communicate via a wireless communication network that supports an Institute of Electronic and Electrical Engineers (IEEE) 802.16 standard.

31. A computer-program product for measuring round-trip delay, the computer-program product comprising a computer-readable medium having instructions thereon, the instructions comprising:

code for determining a first time difference between two different types of frames at a base station;

code for determining a second time difference between the two different types of frames at a mobile station; and

code for calculating the round-trip delay based on the first time difference and the second time difference.

32. The computer-program product of claim 31, wherein the first time difference is a transmit/receive transition gap at the base station (TTG), and wherein the second time difference is a transmit/receive transition gap at the mobile station (TTG_MS).

33. The computer-program product of claim 32, wherein the round-trip delay is calculated as TTG−

TTG_MS.

34. The computer-program product of claim 31, wherein the first time difference is a receive/transmit transition gap at the base station (RTG), and wherein the second time difference is a receive/transmit transition gap at the mobile station (RTG_MS).

35. The computer-program product of claim 34, wherein the round-trip delay is calculated as RTG_MS−

RTG.

36. The computer-program product of claim 31, further comprising means for calibrating uplink transmission timing.

37. The computer-program product of claim 31, further comprising:

means for determining a timing shift of a downlink frame since a previous uplink timing calibration; and

means for accounting for the timing shift in the calculation of the round-trip delay.

38. The computer-program product of claim 32, wherein the round-trip delay is calculated as TTG−

TTG_MS+D, and wherein D is a timing shift of a downlink frame since a previous uplink timing calibration.

39. The computer-program product of claim 34, wherein the round-trip delay is calculated as RTG_MS−

RTG+D, and wherein D is a timing shift of a downlink frame since a previous uplink timing calibration.

40. The computer-program product of claim 31, wherein the mobile station is configured to communicate via a wireless communication network that supports an Institute of Electronic and Electrical Engineers (IEEE) 802.16 standard.