Adjusting transmit power in a wireless communication system

• US 7,835,762 B2
• Filed: 10/28/2002
• Issued: 11/16/2010
• Est. Priority Date: 06/27/2002
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sendonaris, Andrew
• Primary Examiner(s): Maung; Nay A
• Assistant Examiner(s): Chan; Richard
• Application Number:
  US10/282,990
• Publication Number:
  US 20040002352A1
• Time in Patent Office: 2,941 Days
• Field of Search: 455/522, 455/69, 455/68, 4554561-4566, 370/318
• US Class Current: 455/522
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/282 taking into account the speed of the mobile
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands

Abstract

A method and apparatus are provided for determining adjustments to be made to a transmitter based on the velocity or location of a wireless communication device in relation to a wireless network infrastructure. The transmitter to be adjusted can be located in either the wireless communication device, or in a device in the wireless communication infrastructure, or both.

Claims

1. A method of controlling transmitted power in a wireless communication system, the method comprising:

determining a velocity ity of a wireless communication device in relation to a device located in a wireless network infrastructure;

measuring a power level of a signal of the wireless communication system received over a wireless channel between the wireless communication device and the device located in the wireless network infrastructure;

determining adjustments to a transmit power level at which the signal of the wireless communication system is transmitted in accordance with the determined velocity of the wireless communication device;

selecting between a first power control loop update frequency if the determined velocity satisfies a first predetermined criteria and a second power control loop update frequency if the determined velocity satisfies a second predetermined criteria, wherein the first predetermined criteria is that the velocity is equal to or less than a first velocity, and the second predetermined criteria is that the velocity is equal to or greater than a second velocity, and wherein the first power control loop update frequency is greater than the second power control loop update frequency; and

providing the adjustments and the selected one of first and second power control loop update frequencies to a transmitter of the signal.

2. A method as defined in claim 1, wherein determining the adjustments to the transmit power level results in a desired received signal power level.

3. A method as defined in claim 1, further comprising

determining an integration interval to be used in measuring the power level of the signal of the wireless communication system based on the determined velocity.

4. A method as defined in claim 1, wherein determining the velocity, measuring the power level, determining the adjustments to the transmit power level, and providing the adjustments to the transmitter are performed in the wireless communication device.

5. A method as defined in claim 1, wherein determining the velocity, measuring the power level, determining the adjustments, and providing the adjustments to the transmitter are performed in the wireless network infrastructure.

6. A method as defined in claim 1, wherein the velocity of the wireless communication device is determined based on information from a navigational receiver.

7. A method as defined in claim 6, wherein the navigational receiver is a Global Positioning System receiver.

8. A method as defined in claim 1, wherein the velocity of the wireless communication device is determined in accordance with at least two location measurements of the wireless communication device, wherein the at least two location measurements are made at different, known times, and the velocity of the wireless communication device is based on the at least two location measurements and their respective measurement times.

30. The method of claim 1, wherein the first velocity is equal to the second velocity.

9. A method of controlling transmitted power in a wireless communication system, the method comprising:

determining a velocity of a wireless communication device in relation to a device located in a wireless network infrastructure;

determining an integration interval to be used in measuring a power level at which a signal of the wireless communication system is received based on the velocity of the wireless communication device;

measuring the power level of the signal of the wireless communication system received over a wireless channel between the wireless communication device and the device located in the wireless network infrastructure using the integration interval;

determining adjustments to a transmit power level at which the signal of the wireless communication system is transmitted in accordance with the determined velocity of the wireless communication device,

selecting between a first power control loop update frequency if the determined velocity satisfies a first predetermined criteria and a second power control loop update frequency if the determined velocity satisfies a second predetermined criteria, wherein the first predetermined criteria is that the velocity is equal to or less than a first velocity, and the second determined criteria is that the velocity is equal to or greater than a second velocity, and wherein the first power control loop update frequency is greater than the second power control loop update frequency; and

providing the adjustments to the transmit power level and the selected one of first and second power control loop update frequencies to a transmitter of the signals.

10. A method as defined in claim 9, wherein determining the adjustments to the transmit power level at which the signal of the wireless communication system is transmitted results in a future desired received signal power level.

11. A method as defined in claim 9, wherein determining the velocity, determining the integration interval, measuring the power level, determining the adjustments to the transmit power level, and providing the adjustments to the transmitter are performed in the wireless communication device.

12. A method as defined in claim 9, wherein determining the velocity, determining the integration interval, measuring the power level, determining the adjustments to the transmit power level, and providing the adjustments to the transmitter are performed in the wireless network infrastructure.

13. A method as defined in claim 9, wherein the velocity of the wireless communication device is determined based on information from a navigational receiver.

14. A method as defined in claim 13, wherein the navigational receiver is a Global Positioning System receiver.

15. A method as defined in claim 9, wherein the velocity of the wireless communication device is determined in accordance with at least two location measurements of the wireless communication device, wherein the at least two location measurements are made at different, known times, and the velocity of the wireless communication device is based on the at least two location measurements and their respective measurement times.

16. A wireless communication device comprising:

a navigational receiver configured to receive navigation data and to output a velocity of the wireless communication device;

a receiver configured to receive signals from a wireless network infrastructure; and

a controller configured

to receive the velocity of the wireless communication device from the navigational receiver and a measurement of a power level of a received signal from the receiver;

to determine adjustments to a transmitter; and

to provide a selection between a first power control loop update frequency if the velocity satisfies a first predetermined criteria and a second power control loop update frequency if the velocity satisfies a second predetermined criteria, wherein the first predetermined criteria is that the velocity is equal to or less than a first velocity, and the second predetermined criteria is that the velocity is equal to or greater than a second velocity, and wherein the first power control loop update frequency is greater than the second power control loop update frequency.

17. A wireless communication device as defined in claim 16, wherein the navigational receiver is a Global Positioning System receiver.

18. A wireless communication device as defined in claim 16, wherein the transmitter to be adjusted is in the wireless communication device.

19. A wireless communication device as defined in claim 16, wherein the transmitter to be adjusted is in a device in a wireless network infrastructure.

20. A wireless network infrastructure device comprising:

a receiver configured to receive signals from a wireless communication device; and

a controller configured

to receive data indicating a velocity of the wireless communication device and a measurement of the power level of a received signal;

to determine adjustments to a transmitter; and

to select between a first power control loop update frequency if the velocity satisfies a first predetermined criteria and a second power control loop update frequency if the velocity satisfies a second predetermined criteria, wherein the first predetermined criteria is that the velocity is equal to or less than a first velocity, and the second predetermined criteria is that the velocity is equal to or greater than a second velocity, and wherein the first power control loop update frequency is greater than the second power control loop update frequency.

21. A wireless network infrastructure device as defined in claim 20, wherein the data indicating the velocity of the wireless communication device is received from the wireless communication device.

22. A wireless network infrastructure device as defined in claim 21, wherein the data indicating the velocity of the wireless communication device is determined by a Global Positioning System receiver.

23. A wireless network infrastructure device as defined in claim 20, wherein the data, indicating the velocity of the wireless communication device is determined in the wireless network infrastructure.

24. A wireless network infrastructure device as defined in claim 20, wherein the transmitter to be adjusted is in the wireless network infrastructure.

25. A wireless network infrastructure device as defined in claim 20, wherein the transmitter to be adjusted is in the wireless communication device.

26. A method of controlling transmitted power in a wireless communication system, the method comprising:

determining a velocity of a wireless communication device;

selecting between a first power control loop update frequency if the determined velocity satisfies a first predetermined criteria and a second power control loop update frequency if the determined velocity satisfies a second predetermined criteria, wherein the first predetermined criteria is that the velocity is equal to or less than a first velocity, and the second predetermined criteria is that the velocity is equal to or greater than a second velocity, and wherein the first power control loop update frequency is greater than the second power control loop update frequency;

measuring a power level of a received signal;

determining an adjustment to a power level of a transmitted signal, wherein the adjustment is based on the measured power level of the received signal;

sending the adjustments to a transmitter of the transmitted signal; and

updating a power control loop at the selected one of the first and second power control loop update frequencies.

27. A device comprising:

means for determining a location of a wireless communication device in relation to a device in a wireless network infrastructure;

means for determining adjustments to a transmit power level in accordance with the determined location; and

means for selecting between a first power control loop update frequency if the determined location satisfies a first predetermined criteria and a second power control loop update frequency if the determined location satisfies a second predetermined criteria, wherein the first predetermined criteria is that the velocity is equal to or less than a first velocity, and the second predetermined criteria is that the velocity is equal to or greater than a second velocity, and wherein the first power control loop update frequency is greater than the second power control loop update frequency.

28. The device of claim 27, wherein the device is a mobile communications device.

29. A wireless communication device comprising:

means for determining a velocity of the wireless communication device in relation to a device located in a wireless network infrastructure;

means for measuring a power level of a signal of the wireless communication system received over a wireless channel between the wireless communication device and the device located in the wireless network infrastructure;

means for determining adjustments to a transmit power level at which the signal of the wireless communication system is transmitted in accordance with the determined velocity of the wireless communication device;

means for selecting between a first power control loop update frequency if the determined velocity satisfies a first predetermined criteria and a second power control loop update frequency if the determined velocity satisfies a second predetermined criteria, wherein the first predetermined criteria is that the velocity is equal to or less than a first velocity, and the second predetermined criteria is that the velocity is equal to or greater than a second velocity, and wherein the first power control loop update frequency is greater than the second power control loop update frequency; and

means for providing the adjustments and the selected one of first and second power control loop update frequencies to a transmitter of the signal.