Apparatus and method for uplink power control for a wireless transmitter/receiver unit utilizing multiple carriers

• US 9,603,099 B2
• Filed: 03/16/2015
• Issued: 03/21/2017
• 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, Zhang, Guodong, Stern-Berkowitz, Janet A., Pietraski, Philip J., Dick, Stephen G., Levy, Joseph S., Pan, Kyle Jung-Lin, Bala, Erdem, Rudolf, Marian, Terry, Stephen E., Koo, Changsoo, Dennean, Charles A., Zeira, Eldad M.
• Primary Examiner(s): Chery, Dady
• Application Number:
  US14/658,792
• Publication Number:
  US 20150189601A1
• Time in Patent Office: 736 Days
• Field of Search: 370/252, 370/241, 370/311, 455/522, 455/69
• US Class Current: 1/1
• 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 for uplink transmission power control in a wireless transmit receive unit (WTRU), the WTRU configured, at least in part, to transmit simultaneously a first uplink channel and a second uplink channel in one or more uplink carriers, the method comprising:

determining a power level of the first uplink channel;

comparing the power level of the first uplink channel to a threshold indexed to at least one uplink carrier to determine a power difference;

determining a value for a power level of the second uplink channel indexed to the at least one uplink carrier; and

setting the power level of the second uplink channel to whichever of the power difference or the determined value is lower, the setting the power level of the second uplink channel not including scaling any of;

the power level of the first uplink channel, the power difference, or the determined value for the power of the second uplink channel.

2. The method of claim 1, wherein the determining a power level of the first uplink channel includes calculating a power level of the first uplink channel indexed to the at least one uplink carrier.

3. The method of claim 1, wherein the first uplink channel is a physical uplink control channel (PUCCH) and the second uplink channel is a physical uplink shared channel (PUSCH).

4. The method of claim 1, wherein the threshold is a maximum WTRU transmit power indexed to the at least one uplink carrier.

5. The method of claim 1, wherein the uplink transmit power is determined for a physical uplink control channel (PUCCH).

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

determining a transmission power level for one or more physical channels for each of a plurality of carriers, the one or more physical channels including a physical uplink shared channel (PUSCH);

summing the transmission power level for the one or more physical channels for each of the plurality of carriers to obtain a combination power level;

determining a maximum transmit power for the WTRU;

comparing the combination power level to the maximum transmit power of the WTRU; and

determining a power scaling scheme for at least one of the one or more physical channels of at least one of the plurality of carriers upon the combination power level exceeding the maximum transmit power of the WTRU, the power scaling scheme including reducing a WTRU total transmission power over one or more of the plurality of carriers, the reduction based on a priority of at least one of;

a PUSCH with uplink control information (UCI), or a PUSCH without UCI, transmitted on the one or more of the plurality of carriers, the priority of the PUSCH with UCI being higher than the priority of the PUSCH without UCI.

7. The method of claim 6, wherein the power scaling scheme further includes:

comparing the transmission power level for one or more of a plurality of carriers to a respective carrier total transmission power threshold; and

adjusting the transmission power level to the respective carrier total transmission power threshold for at least one of the one or more of the plurality of carriers for which the comparison indicates the transmission power level exceeds the respective carrier total transmission power threshold.

8. The method of claim 6, wherein the power scaling scheme further includes:

the PUSCH without UCI transmitted on the one or more of the plurality of carriers to zero.

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

a transmitter configured to transmit simultaneously a first uplink channel and a second uplink channel in one or more uplink carriers; and

a processor configured to;

determine a power level of the first uplink channel;

compare the power level of the first uplink channel to a threshold indexed to at least one uplink carrier to determine a power difference;

determine a value for a power level of the second f uplink channel indexed to the at least one uplink carrier; and

set the power level of the second uplink channel to whichever of the power difference or the determined value is lower, the power level of the second uplink channel being set without scaling any of;

the power level of the first uplink channel, the power difference, or the determined value for the power of the second uplink channel.

10. The WTRU of claim 9, wherein the processor is further configured, as part of the determining a power level of the first uplink channel, to calculate a power level of the first uplink channel indexed to the at least one uplink carrier.

11. The WTRU of claim 9, wherein the processor is further configured such that the first uplink channel is a physical uplink control channel (PUCCH) and the second uplink channel is a physical shared channel (PUSCH).

12. The WTRU of claim 9, wherein the processor is further configured such that the threshold is a maximum WTRU transmit power indexed to the at least one uplink carrier.

13. The WTRU of claim 9, wherein the processor is further configured such the uplink transmit power is determined for a physical uplink control channel (PUCCH).

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 transmission power level for one or more physical channels for each of a plurality of carriers, the one or more physical channels including a physical uplink shared channel (PUSCH);

sum the transmission power level for the one or more physical channels for each of the plurality of carriers to obtain a combination power level;

determine a maximum transmit power for the WTRU;

compare the combination power level to the maximum transmit power of the WTRU; and

determine a power scaling scheme for at least one of the one or more physical channels of at least one of the plurality of carriers upon the combination power level exceeding the maximum transmit power of the WTRU, the power scaling scheme including a reduction of a WTRU total transmission power over one or more of the plurality of carriers, the reduction based on a priority of at least one of;

a PUSCH with uplink control information (UCI), or a PUSCH without UCI, transmitted on the one or more of the plurality of carriers, the priority of the PUSCH with UCI being higher than the priority of the PUSCH without UCI.

15. The method of claim 14, wherein the processor is further configured, as part of the power scaling scheme, to:

compare the transmission power level for one or more of a plurality of carriers to a respective carrier total transmission power threshold; and

adjust the transmission power level to the respective carrier total transmission power threshold for at least one of the one or more of the plurality of carriers for which the comparison indicates the transmission power level exceeds the respective carrier total transmission power threshold.

16. The method of claim 14, wherein the processor is further configured, as part of the power scaling scheme, to:

scale the PUSCH without UCI transmitted on the one or more of the plurality of carriers to zero.