Multi-slot power control for wireless transmission

• US 20090081973A1
• Filed: 09/26/2007
• Published: 03/26/2009
• Est. Priority Date: 09/26/2007
• Status: Abandoned Application

• Current Assignee: MediaTek, Inc.
• Original Assignee: Analog Devices, Inc.
• Inventors: Ma, Liang, Strange, Jonathan Richard, Tenbroek, Bernard Mark, Yan, Aiguo, Mathew, Deepak
• Application Number:
  US11/904,109
• Publication Number:
  US 20090081973A1
• Time in Patent Office: Days
• US Class Current: 455/127.100
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/14 Separate analysis of uplink or downlink
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

Methods and apparatus are provided for controlling transmitted power in a wireless system. The method includes generating information to be transmitted as a series of signal bursts, with a time interval between successive signal bursts, controlling individually a power level of each of said signal bursts with a power control signal to provide output signal bursts to be transmitted, and asserting a new power value of the power control signal during the time interval preceding each signal burst. The wireless system can be a TDSCDMA wireless system, and the signal bursts can be uplink signal bursts.

Claims

1. A method for controlling transmitted power in a wireless system, comprising:

generating information to be transmitted as a series of signal bursts, with a time interval between successive signal bursts;

controlling individually a power level of each of said signal bursts with a power control signal to provide output signal bursts to be transmitted; and

asserting a new power value of the power control signal during the time interval preceding each signal burst.

2. A method as defined in claim 1, wherein the new power value of the power control signal is asserted when the transmitted power is at or near zero.

3. A method as defined in claim 1, wherein the wireless system comprises a TDSCDMA wireless system.

4. A method as defined in claim 3, wherein the signal bursts comprise uplink signal bursts transmitted from a mobile wireless station to a base station.

5. A method as defined in claim 1, wherein controlling the power level of each of said signal bursts comprises applying a gain control signal to a power amplifier that amplifies the signal bursts.

6. A method as defined in claim 1, wherein generating information further comprises providing a power value that corresponds to each of said signal bursts and wherein the power control signal is responsive to the power value.

7. A method as defined in claim 6, wherein generating information further comprises providing timing information that corresponds to each of said signal bursts and wherein the power control signal is responsive to the timing information.

8. A method as defined in claim 1, wherein controlling the power level of each of said signal bursts comprises controlling the power level in an analog domain of the wireless system.

9. A method as defined in claim 1, wherein controlling the power level of each of said signal bursts comprises controlling the power level in a digital domain of the wireless system.

10. A method as defined in claim 1, wherein the new power value of the power control signal is asserted during the time interval between time slots of a TDSCDMA subframe.

11. A method as defined in claim 1, wherein the new power value of the power control signal is asserted between subframes of a TDSCDMA frame.

12. A method as defined in claim 1, wherein the new power value of the power control signal is asserted between TDSCDMA frames.

13. A method as defined in claim 1, wherein the power level of each of said signal bursts is controlled without ramping of the power control signal.

14. A method as defined in claim 1, wherein the power control signal is asserted when the transmitted signal is at least 20 dB less than the nominal power.

15. A method as defined in claim 1, wherein asserting a new power value of the power control signal comprises changing the power control signal from a first power value to a second power value during the time interval preceding each signal burst.

16. A method as defined in claim 1, wherein the new power value of the power control signal is different from a previous power value of the power control signal.

17. A method as defined in claim 1, wherein the new power value of the power control signal is the same as a previous power value of the power control signal.

18. Apparatus for controlling transmitted power in a wireless system, comprising:

a signal generation unit configured to generate a series of signal bursts, with a time interval between successive signal bursts;

an amplifier configured to control individually a power level of each of said signal bursts in response to a power control signal to provide output signal bursts to be transmitted; and

a power control circuit configured to generate the power control signal in response to a power value and timing information that correspond to each of the signal bursts, a new power value of the power control signal being asserted during the time interval preceding each signal burst.

19. Apparatus as defined in claim 18, wherein the power control circuit is configured to assert the new power value of the power control signal when the transmitted power is at or near zero.

20. Apparatus as defined in claim 18, wherein the wireless system comprises a TDSCDMA wireless system.

21. Apparatus as defined in claim 20, wherein the signal generation unit is configured to generate uplink signal bursts for transmission from a mobile wireless unit to a base station.

22. Apparatus as defined in claim 18, wherein the amplifier comprises a power amplifier and wherein the power control signal comprises a gain control signal.

23. Apparatus as defined in claim 18, wherein the signal generation unit provides to the power control circuit the power value and the timing information that correspond to each of the signal bursts.