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

• US 20150201381A1
• Filed: 03/26/2015
• Published: 07/16/2015
• 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, Lin, Zinan, Grieco, Donald M., Olesen, Robert L.
• Granted Patent: US 9,271,240 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 implemented by an eNode-B, the method comprising:

transmitting, to a wireless transmit/receive unit (WTRU) via higher layer signaling, open loop uplink (UL) power control (PC) parameters including a cell-specific parameter and a WTRU-specific parameter;

transmitting a PC correction command; and

receiving, from the WTRU, a transmission having an applied transmit power, wherein;

the transmission comprises a number of resource blocks;

the applied transmit power is based on a transmit power spectral density and the number of resource blocks;

the transmit power spectral density comprises a combination of an open loop UL PC component, a closed loop PC component and a delta factor related to an offset value;

the offset value is related to a modulation coding set (MCS);

the open loop UL PC component is based on pathloss, the cell-specific parameter and the WTRU-specific parameter;

the closed loop PC component includes a correction factor; and

the correction factor is based on the PC correction command.

2. The method of claim 1, wherein the PC correction command is transmitted in an UL grant associated with a hybrid automatic repeat request (HARQ) process.

3. The method of claim 2, wherein the received transmission with applied transmission power is received in accordance with a timing of the HARQ process.

4. The method of claim 1, wherein the PC correction command is transmitted at a pre-configured signaling time.

5. The method of claim 1, further comprising:

signaling the MCS to the WTRU in an UL grant associated with a hybrid automatic repeat request (HARQ) process.

6. The method of claim 2, further comprising:

signaling the MCS to the WTRU in the UL grant.

7. An eNode-B comprising:

a transmitter configured to;

transmit, to a wireless transmit/receive unit (WTRU) via higher layer signaling, open loop uplink (UL) power control (PC) parameters including a cell-specific parameter and a WTRU-specific parameter; and

transmit a PC correction command; and

a receiver configured to receive, from the WTRU, a transmission having an applied transmit power, wherein;

the transmission comprises a number of resource blocks;

the applied transmit power is based on a transmit power spectral density and the number of resource blocks;

the transmit power spectral density comprises a combination of an open loop UL PC component, a closed loop PC component and a delta factor related to an offset value;

the offset value is related to a modulation coding set (MCS);

the open loop UL PC component is based on pathloss, the cell-specific parameter and the WTRU-specific parameter;

the closed loop PC component includes a correction factor; and

the correction factor is based on the PC correction command.

8. The eNode-B of claim 7, wherein the transmitter is configured to transmit the PC correction command in an UL grant associated with a hybrid automatic repeat request (HARQ) process.

9. The eNode-B of claim 8, wherein the receiver is configured to receive the transmission with applied transmission power in accordance with a timing of the HARQ process.

10. The eNode-B of claim 7, wherein the transmitter is configured to transmit the PC correction command at a pre-configured signaling time.

11. The eNode-B of claim 7, wherein the transmitter is configured to signal the MCS to the WTRU in an UL grant associated with a hybrid automatic repeat request (HARQ) process.

12. The eNode-B of claim 8, wherein the transmitter is configured to signal the MCS to the WTRU in an UL grant.

13. 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;

the open loop UL PC component is based on pathloss and open loop UL PC parameters including a cell-specific parameter and a WTRU-specific parameter provided from higher layers;

the closed loop PC component includes a correction factor;

the correction factor is based on a PC correction command signaled in a UL grant associated with a hybrid automatic repeat request (HARQ) process;

the offset value is related to an assigned modulation coding set (MCS) signaled in the UL grant;

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

applying the transmit power in accordance with a timing of the HARQ process.

14. The method of claim 13, wherein applying the transmit power in accordance with a timing of the HARQ process comprises:

applying the transmit power after one HARQ cycle time.

15. The method of claim 13, wherein the PC correction command includes multiple command bits.

16. The method of claim 13, wherein applying the transmit power in accordance with a timing of the HARQ process comprises:

applying the transmit power on condition that the transmit power is less than a maximum transmit power level.

17. The method of claim 16, further comprising:

receiving signaling including the maximum transmit power level.

18. The method of claim 16, further comprising applying the maximum transmit power level in accordance with a timing of the HARQ process on condition that the transmit power is greater than or equal to the maximum transmit power level.

19. The method of claim 16, wherein the maximum transmit power level is based on at least one of (i) a power class of the WTRU, and (ii) a capability of the WTRU.

20. 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;

the open loop UL PC component is based on pathloss and open loop UL PC parameters including a cell-specific parameter and a WTRU-specific parameter provided from higher layers;

the closed loop PC component includes a correction factor;

the correction factor is based on a PC correction command signaled in a UL grant associated with a hybrid automatic repeat request (HARQ) process;

the offset value is related to an assigned modulation coding set (MCS) signaled in the UL grant;

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

apply the transmit power in accordance with a timing of the HARQ process.

21. The WTRU of claim 20, wherein the processor is configured to apply the transmit power after one HARQ cycle time.

22. The WTRU of claim 20, wherein the PC correction command includes multiple command bits.

23. The WTRU of claim 20, wherein the processor is configured to apply the transmit power in accordance with a timing of the HARQ process on condition that the transmit power is less than a maximum transmit power level.

24. The WTRU of claim 23, 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.

25. The WTRU of claim 23, wherein the processor is configured to apply the maximum transmit power level in accordance with a timing of the HARQ process on condition that the transmit power is greater than or equal to the maximum transmit power level.

26. The WTRU of claim 23, wherein the maximum transmit power level is based on at least one of (i) a power class of the WTRU, and (ii) a capability of the WTRU.