COMBINED OPEN LOOP/CLOSED LOOP METHOD FOR CONTROLLING UPLINK POWER OF A MOBILE STATION

• US 20140323173A1
• Filed: 07/11/2014
• Published: 10/30/2014
• Est. Priority Date: 03/07/2007
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Shin, Sung-Hyuk, Olesen, Robert L., Lin, Zinan, Grieco, Donald M.
• Granted Patent: US 9,026,169 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Abstract

A method and apparatus are disclosed comprising a combined open loop/closed loop uplink power control scheme for E-UTRA. The combined open and closed loop method for UL intra-cell PC controls the wireless transmit receive unit (WTRU) transmit power spectral density (PSD), PSD_Tx, (e.g. power per RB).

Claims

1. A method for controlling transmit power of a wireless transmit/receive unit (WTRU) comprising:

determining a transmit power spectral density, wherein the transmit power spectral density comprises a combination of an open loop uplink (UL) power control (PC) component, a closed loop PC component and a delta factor related to an offset value, wherein the open loop UL PC component is based on a pathloss measurement, wherein the closed loop PC component comprises a correction factor, and wherein the offset value is related to a modulation coding set (MCS);

determining a transmit power based on the determined transmit power spectral density and a number of assigned resource blocks (RBs); and

applying a minimum of a maximum transmit power level and the transmit power.

2. The method of claim 1, further comprising:

receiving signaling including the maximum transmit power level.

3. The method of claim 1, further comprising:

receiving a PC correction command, and wherein the correction factor is based on the received PC correction command or an accumulated correction command.

4. The method of claim 3, wherein the PC correction command is received at a pre-configured signaling time.

5. The method of claim 1, wherein the correction factor is based on a PC correction command signaled in a UL grant associated with a hybrid automatic repeat request (HARQ) process

6. The method of claim 5, wherein any of the maximum transmit power level and the transmit power is applied in accordance with a timing of the HARQ process.

7. The method of claim 1, wherein the open loop PC component comprises a cell-specific parameter.

8. The method of claim 1, wherein the open loop PC component comprises a cell-specific parameter, and wherein the cell-specific parameter is provided from higher layers.

9. The method of claim 1, wherein the open loop PC component comprises a WTRU-specific parameter.

10. The method of claim 1, wherein the open loop PC component comprises a WTRU-specific parameter, and wherein the WTRU-specific parameter is provided from higher layers.

11. The method of claim 1, wherein the open loop PC component comprises a cell-specific parameter and a WTRU-specific parameter.

12. The method of claim 11, wherein the open loop PC component comprises a cell-specific parameter and a WTRU-specific parameter, and wherein the cell-specific parameter and the WTRU-specific parameter are provided from higher layers.

13. The method of claim 1, further comprising:

receiving the maximum power transmit level.

14. The method of claim 1, wherein the maximum transmit power level is based on a power class of the WTRU.

15. The method of claim 1, wherein the maximum transmit power level is based on a capability of the WTRU.

16. A wireless transmit/receive unit (WTRU) comprising a processor, wherein the processor is configured to:

determine a transmit power spectral density, wherein the transmit power spectral density comprises a combination of an open loop uplink (UL) power control (PC) component, a closed loop PC component and a delta factor related to an offset value, wherein the open loop UL PC component is based on a pathloss measurement, wherein the closed loop PC component comprises a correction factor, and wherein the offset value is related to a modulation coding set (MCS); and

determine a transmit power based on the transmit power spectral density and a number of assigned resource blocks (RBs); and

apply a minimum of a maximum transmit power level and the transmit power

17. The WTRU of claim 16, further comprising a receiver, wherein the receiver is configured to receive signaling including the maximum transmit power level, and wherein the processor is configured to:

obtain the maximum transmit power level signaled in the received signaling.

18. The WTRU of claim 16, further comprising a receiver, wherein the receiver is configured to receive a PC correction command, and wherein the correction factor is based on the received PC correction command or an accumulated correction command.

19. The WTRU of claim 18, wherein the PC correction command is received at a pre-configured signaling time.

20. The WTRU of claim 16, wherein the correction factor is based on a PC correction command signaled in a UL grant associated with a hybrid automatic repeat request (HARQ) process.

21. The WTRU of claim 16, wherein the processor is adapted to apply the maximum power level or the transmit power in accordance with a timing of the HARQ process.

22. The WTRU of claim 16, wherein the open loop PC component comprises a cell-specific parameter.

23. The WTRU of claim 16, wherein the open loop PC component comprises a cell-specific parameter, and wherein the cell-specific parameter is provided from higher layers.

24. The WTRU of claim 16, wherein the open loop PC component comprises a WTRU-specific parameter.

25. The WTRU of claim 16, wherein the open loop PC component comprises a WTRU-specific parameter, and wherein the WTRU-specific parameter is provided from higher layers.

26. The WTRU of claim 16, wherein the open loop PC component comprises a cell-specific parameter and a WTRU-specific parameter.

27. The WTRU of claim 16, wherein the open loop PC component comprises a cell-specific parameter and a WTRU-specific parameter, and wherein the cell-specific parameter and the WTRU-specific parameter are provided from higher layers.

28. The WTRU of claim 16, wherein the processor is configured to:

receive the maximum power transmit level.

29. The WTRU of claim 16, wherein the maximum power transmit level is based on WTRU power class.

30. The WTRU of claim 16, wherein the maximum power transmit level is based on a maximum allowed power.