METHOD AND APPARATUS FOR POWER CONTROL DURING DTX OPERATION

• US 20080207247A1
• Filed: 01/30/2008
• Published: 08/28/2008
• Est. Priority Date: 01/31/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gholmieh, Aziz, Montojo, Juan, Lundby, Stein Arne
• Granted Patent: US 7,881,742 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/56 Detection of errors of TPC bits

Abstract

Techniques for performing power control during discontinuous transmission (DTX) operation are described. A UE transmits on the uplink during a transmission burst and receives TPC commands generated by a Node B based on the uplink transmission. The UE may receive two TPC commands at the end of the transmission burst that are not applied during the transmission burst. The UE saves and applies these two TPC commands in the next transmission burst. In one design, the UE applies each saved TPC command in one slot of the next transmission burst. In another design, the UE combines the two saved TPC commands and applies the combined value in the first two slots of the next transmission burst. In yet another design, the UE selects one of the saved TPC commands and applies the selected TPC command in the first two slots of the next transmission burst.

Claims

1. An apparatus for wireless communication, comprising:

at least one processor configured to receive multiple transmit power control (TPC) commands during a first transmission burst, to adjust transmit power of transmission sent during the first transmission burst based on at least one of the multiple TPC commands, and to adjust transmit power of transmission sent during a second transmission burst based on at least two last TPC commands among the multiple TPC commands, the second transmission burst being separated from the first transmission burst by a discontinuous transmission (DTX) period; and

a memory coupled to the at least one processor.

2. The apparatus of claim 1, wherein the at least one processor is configured to adjust transmit power of transmission sent during an early portion of the second transmission burst based on the at least two last TPC commands received during the first transmission burst, and to adjust transmit power of transmission sent during remaining portion of the second transmission burst based on TPC commands received during the second transmission burst.

3. The apparatus of claim 1, wherein the at least one processor is configured to adjust transmit power of transmission sent in one of first two slots of the second transmission burst based on one of last two TPC commands received during the first transmission burst, and to adjust transmit power of transmission sent in other one of the first two slots of the second transmission burst based on other one of the last two TPC commands received during the first transmission burst.

4. The apparatus of claim 1, wherein the at least one processor is configured to adjust transmit power of transmission sent in a first slot of the second transmission burst based on a second to last TPC command received during the first transmission burst, and to adjust transmit power of transmission sent in a second slot of the second transmission burst based on a last TPC command received during the first transmission burst.

5. The apparatus of claim 1, wherein the at least one processor is configured to adjust transmit power of transmission sent in a first slot of the second transmission burst based on an UP TPC command, if any, among last two TPC commands received during the first transmission burst, and to adjust transmit power of transmission sent in a second slot of the second transmission burst based on other one of the last two TPC commands received during the first transmission burst.

6. The apparatus of claim 1, wherein the at least one processor is configured to obtain a combined value based on last two TPC commands received during the first transmission burst, and to adjust transmit power of transmission sent in first two slots of the second transmission burst based on the combined value.

7. The apparatus of claim 1, wherein the at least one processor is configured to obtain a combined value based on last two TPC commands received during the first transmission burst, to limit the combined value to within a predetermined range to obtain a capped value, and to adjust transmit power of transmission sent in first two slots of the second transmission burst based on the capped value.

8. The apparatus of claim 1, wherein the at least one processor is configured to select one of the at least two last TPC commands received during the first transmission burst, and to adjust transmit power of transmission sent in at least one slot of the second transmission burst based on the selected TPC command.

9. The apparatus of claim 1, wherein the at least one processor is configured to select a most reliable TPC command among the at least two last TPC commands received during the first transmission burst, and to adjust transmit power of transmission sent in at least one slot of the second transmission burst based on the selected TPC command.

10. The apparatus of claim 1, wherein the at least one processor is configured to select last TPC command received during the first transmission burst, and to adjust transmit power of transmission sent in first two slots of the second transmission burst based on the last TPC command.

11. The apparatus of claim 1, wherein the at least one processor is configured to receive the multiple TPC commands in multiple slots at one of multiple possible time offsets.

12. The apparatus of claim 11, wherein the at least one processor is configured to adjust transmit power of transmission sent during the second transmission burst based on two last TPC commands if received within a first range of time offsets, and to adjust transmit power of transmission sent during the second transmission burst based on last TPC command if received within a second range of time offsets.

13. The apparatus of claim 1, wherein the at least one processor is configured to receive the multiple TPC commands on a Fractional Dedicated Physical Channel (F-DPCH), and to send transmission on an uplink Dedicated Physical Control Channel (UL-DPCCH) during the first and second transmission bursts.

14. A method for wireless communication, comprising:

receiving multiple transmit power control (TPC) commands during a first transmission burst;

adjusting transmit power of transmission sent during the first transmission burst based on at least one of the multiple TPC commands; and

adjusting transmit power of transmission sent during a second transmission burst based on at least two last TPC commands among the multiple TPC commands, the second transmission burst being separated from the first transmission burst by a discontinuous transmission (DTX) period.

15. The method of claim 14, wherein the adjusting transmit power of transmission sent during the second transmission comprises

adjusting transmit power of transmission sent in one of first two slots of the second transmission burst based on one of last two TPC commands received during the first transmission burst, and

adjusting transmit power of transmission sent in other one of the first two slots of the second transmission burst based on other one of the last two TPC commands received during the first transmission burst.

16. The method of claim 14, wherein the adjusting transmit power of transmission sent during the second transmission comprises

obtaining a combined value based on last two TPC commands received during the first transmission burst, and

adjusting transmit power of transmission sent in first two slots of the second transmission burst based on the combined value.

17. The method of claim 14, wherein the adjusting transmit power of transmission sent during the second transmission comprises

selecting one of the at least two last TPC commands received during the first transmission burst, and

adjusting transmit power of transmission sent in at least one slot of the second transmission burst based on the selected TPC command.

18. The method of claim 14, wherein the receiving the multiple TPC commands comprises receiving the multiple TPC commands on a Fractional Dedicated Physical Channel (F-DPCH), and wherein the method further comprises:

sending transmission on an uplink Dedicated Physical Control Channel (UL-DPCCH) during the first and second transmission bursts.

19. An apparatus for wireless communication, comprising:

means for receiving multiple transmit power control (TPC) commands during a first transmission burst;

means for adjusting transmit power of transmission sent during the first transmission burst based on at least one of the multiple TPC commands; and

means for adjusting transmit power of transmission sent during a second transmission burst based on at least two last TPC commands among the multiple TPC commands, the second transmission burst being separated from the first transmission burst by a discontinuous transmission (DTX) period.

20. The apparatus of claim 19, wherein the means for adjusting transmit power of transmission sent during the second transmission comprises

means for adjusting transmit power of transmission sent in one of first two slots of the second transmission burst based on one of last two TPC commands received during the first transmission burst, and

means for adjusting transmit power of transmission sent in other one of the first two slots of the second transmission burst based on other one of the last two TPC commands received during the first transmission burst.

21. The apparatus of claim 19, wherein the means for adjusting transmit power of transmission sent during the second transmission comprises

means for obtaining a combined value based on last two TPC commands received during the first transmission burst, and

means for adjusting transmit power of transmission sent in first two slots of the second transmission burst based on the combined value.

22. The apparatus of claim 19, wherein the means for adjusting transmit power of transmission sent during the second transmission comprises

means for selecting one of the at least two last TPC commands received during the first transmission burst, and

means for adjusting transmit power of transmission sent in at least one slot of the second transmission burst based on the selected TPC command.

23. The apparatus of claim 19, wherein the means for receiving the multiple TPC commands comprises means for receiving the multiple TPC commands on a Fractional Dedicated Physical Channel (F-DPCH), and wherein the apparatus further comprises:

means for sending transmission on an uplink Dedicated Physical Control Channel (UL-DPCCH) during the first and second transmission bursts.

24. A computer program product, comprising:

a computer-readable medium comprising;

code for causing at least one computer to receive multiple transmit power control (TPC) commands during a first transmission burst;

code for causing the at least one computer to adjust transmit power of transmission sent during the first transmission burst based on at least one of the multiple TPC commands; and

code for causing the at least one computer to adjust transmit power of transmission sent during a second transmission burst based on at least two last TPC commands among the multiple TPC commands, the second transmission burst being separated from the first transmission burst by a discontinuous transmission (DTX) period.

25. The computer program product of claim 24, the computer-readable medium further comprising:

code for causing the at least one computer to adjust transmit power of transmission sent in one of first two slots of the second transmission burst based on one of last two TPC commands received during the first transmission burst; and

code for causing the at least one computer to adjust transmit power of transmission sent in other one of the first two slots of the second transmission burst based on other one of the last two TPC commands received during the first transmission burst.

26. The computer program product of claim 24, the computer-readable medium further comprising:

code for causing the at least one computer to obtain a combined value based on last two TPC commands received during the first transmission burst; and

code for causing the at least one computer to adjust transmit power of transmission sent in first two slots of the second transmission burst based on the combined value.

27. The computer program product of claim 24, the computer-readable medium further comprising:

code for causing the at least one computer to select one of the at least two last TPC commands received during the first transmission burst; and

code for causing the at least one computer to adjust transmit power of transmission sent in at least one slot of the second transmission burst based on the selected TPC command.

28. The computer program product of claim 24, the computer-readable medium further comprising:

code for causing the at least one computer to receive the multiple TPC commands on a Fractional Dedicated Physical Channel (F-DPCH); and

code for causing the at least one computer to send transmission on an uplink Dedicated Physical Control Channel (UL-DPCCH) during the first and second transmission bursts.

29. An apparatus for wireless communication, comprising:

at least one processor configured to send multiple transmit power control (TPC) commands during a first transmission burst, to receive transmission sent during the first transmission burst with transmit power adjusted based on at least one of the multiple TPC commands, and to receive transmission sent during a second transmission burst with transmit power adjusted based on at least two last TPC commands among the multiple TPC commands, the second transmission burst being separated from the first transmission burst by a discontinuous transmission (DTX) period; and

a memory coupled to the at least one processor.

30. The apparatus of claim 29, wherein the at least one processor is configured to estimate signal-to-noise-and-interference ratio (SIR) based on the transmission received during the first transmission burst, and to generate the multiple TPC commands based on the estimated SIR.

31. A method for wireless communication, comprising:

sending multiple transmit power control (TPC) commands during a first transmission burst;

receiving transmission sent during the first transmission burst with transmit power adjusted based on at least one of the multiple TPC commands; and

receiving transmission sent during a second transmission burst with transmit power adjusted based on at least two last TPC commands among the multiple TPC commands, the second transmission burst being separated from the first transmission burst by a discontinuous transmission (DTX) period.

32. The method of claim 31, further comprising:

estimating signal-to-noise-and-interference ratio (SIR) based on the transmission received during the first transmission burst; and

generating the multiple TPC commands based on the estimated SIR.