APPARATUS AND METHOD FOR UPLINK POWER CONTROL FOR A WIRELESS TRANSMITTER/RECEIVER UNIT UTILIZING MULTIPLE CARRIERS

• US 20110038271A1
• Filed: 02/09/2010
• Published: 02/17/2011
• Est. Priority Date: 02/09/2009
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Shin, Sung-Hyuk, Pan, Kyle Jung-Lin, Zeira, Eldad M., Dennean, Charles A., Pietraski, Philip J., Stern-Berkowitz, Janet A., Levy, Joseph S., Koo, Chang-Soo, Dick, Stephen G., Terry, Stephen E., Zhang, Guodong, Bala, Erdem, Rudolf, Marian
• Granted Patent: US 8,982,801 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• 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 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

A method and apparatus for determining uplink power in a wireless transmit receive unit (WTRU). The WTRU operates in a carrier aggregated system. The WTRU is configured to receive a plurality of uplink power parameters indexed to one of a plurality of uplink carriers and receive a transmit power control command indexed to the one of the plurality of uplink carriers. The WTRU is configured to determine a pathloss of the one of the plurality of uplink carriers and determine a transmit power for the one of the plurality of uplink carriers based on the plurality of power parameters, the transmit power control command, and the pathloss.

Claims

1. A method of determining uplink power in a wireless transmit receive unit (WTRU), the method comprising:

receiving a plurality of uplink power parameters indexed to one of a plurality of uplink carriers;

receiving a transmit power control command indexed to the one of the plurality of uplink carriers;

determining a pathloss of the one of the plurality of uplink carriers; and

determining a transmit power for the one of the plurality of uplink carriers based on the plurality of power parameters, the transmit power control command, and the pathloss.

2. The method as in claim 1 further comprising transmitting an uplink channel on at least one of the plurality of the uplink carriers.

3. The method as in claim 1 further comprising transmitting a plurality of uplink channels on the plurality of uplink carriers.

4. The method as in claim 3 further comprising determining an uplink power for each of the plurality of uplink channels and each of the plurality of uplink carriers.

5. A method of uplink transmission power control in a wireless transmit receive unit (WTRU), the method comprising:

determining a first uplink channel with a first priority;

determining a second uplink channel with a second priority;

determining a power level of the uplink channel with the first priority;

comparing the power level of the uplink channel with the first priority to a threshold to determine excess power;

allocating the excess power to the second uplink channel.

6. A method of transmit power control in a wireless transmit receive unit (WTRU), the method comprising:

receiving a transmit power control (TPC) command;

applying the TPC command to an uplink (UL) control channel and an UL shared channel; and

simultaneously transmitting the UL control channel and UL shared channel with a power based on the applied TPC command.

7. A method of transmit power control in a wireless transmit receive unit, the method comprising:

receiving a plurality of transmit power control (TPC) commands;

separating the plurality of TPC commands in a plurality of individual TPC commands based on a command format and an identifier;

applying at least a first one of the individual TPC commands to an uplink (UL) control channel;

applying at least a second one of the individual TPC commands to an UL shared channel; and

simultaneously transmitting the UL control channel and the uplink shared channel.

8. The method as in claim 8 further comprising receiving a power headroom report configuration.

9. The method as in claim 8 further comprising transmitting a power headroom report based on the power headroom report configuration.

10. A wireless transmit receive unit (WTRU) configured to determine uplink (UL) power, the WTRU comprising:

a receiver configured to receive a plurality of uplink power parameters indexed to one of a plurality of uplink carriers and a transmit power control command indexed to the one of the plurality of uplink carriers; and

a processor configured to determine a pathloss of the one of the plurality of uplink carriers and determine a transmit power for the one of the plurality of uplink carriers based on the plurality of power parameters, the transmit power control command, and the pathloss.

11. The WTRU as in claim 10 further comprising a transmitter configured to transmit an uplink channel on at least one of the plurality of the uplink carriers.

12. The WTRU as in claim 10 further comprising a transmitter configured to transmit a plurality of uplink channels on the plurality of uplink carriers.

13. The WTRU as in claim 10 wherein the processor is further configured to determine an uplink power for each of the plurality of uplink channels and each of the plurality of uplink carriers

14. A wireless transmit receive unit (WTRU) configured to determine uplink (UL) power, the WTRU comprising a processor, wherein the processor is configured to:

determine a first uplink channel with a first priority;

determine a second uplink channel with a second priority;

determine a power level of the uplink channel with the first priority;

compare the power level of the uplink channel with the first priority to a threshold to determine excess power; and

allocate the excess power to the second uplink channel.

15. A wireless transmit receive unit (WTRU) configured to determine uplink (UL) power, the WTRU comprising:

a receiver configured to receive a transmit power control (TPC) command;

a processor configured to apply the TPC command to an uplink (UL) control channel and an UL shared channel; and

a transmitter configured to transmit the UL control channel and the UL shared channel simultaneously.

16. A wireless transmit receive unit (WTRU) configured to determine uplink (UL) power, the WTRU comprising:

a receiver configured to receive a plurality of transmit power control (TPC) commands;

a processor configured to separate the plurality of TPC commands in a plurality of individual TPC commands based on a command format and an identifier, apply at least a first one of the individual TPC commands to an uplink (UL) control channel, and apply at least a second one of the individual TPC commands to an UL shared channel; and

a transmitter configured to simultaneously transmit the UL control channel and the UL shared channel.

17. The WTRU as in claim 16 wherein the receiver is further configured to receive a power headroom report configuration.

18. The WTRU as in claim 16 wherein the processor is further configured to create a headroom report based on the headroom report configuration and the transmitter is further configured to transmit the headroom report based on the headroom report configuration.