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Methods and apparatus for power control are described. Methods are included for calculating and signaling power control related data to support multiple component carriers (CCs) for which transmission may be accomplished with one or more WTRU power amplifiers (PAs). Methods are included for calculat

Methods and apparatus for power control are described. Methods are included for calculating and signaling power control related data to support multiple component carriers (CCs) for which transmission may be accomplished with one or more WTRU power amplifiers (PAs). Methods are included for calculating and signaling one or more of CC-specific power control related data and PA-specific power control related data. The power control related data may include one or more of maximum power, power headroom, and transmit power. Methods for selecting which power control related data to exchange are included. Methods are included for calculating and signaling power control related data for physical UL shared channel (PUSCH), physical UL control channel (PUCCH), and simultaneous PUSCH and PUCCH transmission.

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1. A method for reporting power headroom, the method comprising: calculating a physical uplink control channel (PUCCH) transmit power associated with a reference downlink control information (DCI) format in the absence of a PUCCH transmission;determining, via a wireless transmit/receive unit (WTRU),

1. A method for reporting power headroom, the method comprising: calculating a physical uplink control channel (PUCCH) transmit power associated with a reference downlink control information (DCI) format in the absence of a PUCCH transmission;determining, via a wireless transmit/receive unit (WTRU), a power headroom using a physical uplink shared channel (PUSCH) transmit power and the PUCCH transmit power; andsending the power headroom. 2. A wireless transmit/receive unit (WTRU), the WTRU comprising: a processor, the processor configured to: calculate a physical uplink control channel (PUCCH) transmit power associated with a reference downlink control information (DCI) format in the absence of a PUCCH transmission;determine a power headroom using a physical uplink shared channel (PUSCH) transmit power and the PUCCH transmit power; andsend the power headroom. 3. The method of claim 1, further comprising determining that the WTRU is configured for simultaneous PUSCH/PUCCH transmission. 4. The method of claim 1, wherein the power headroom is a first power headroom, the PUSCH transmit power is a first PUSCH transmit power, and the method further comprises: determining a second power headroom using a second PUSCH transmit power; andsending the first power headroom and the second power headroom in the same subframe. 5. The method of claim 4, wherein the first power headroom is for a carrier, the second power headroom is for the carrier, the first PUSCH transmit power is for the carrier, and the second PUSCH transmit power is for the carrier. 6. The method of claim 4, wherein the first power headroom is for a first carrier, the second power headroom is for a second carrier, the first PUSCH transmit power is for the first carrier, and the second PUSCH transmit power is for the second carrier. 7. The method of claim 1, further comprising determining a carrier has a PUSCH transmission in a subframe. 8. The method of claim 1, further comprising determining a maximum power for a carrier. 9. The method of claim 8, wherein the maximum power for the carrier is a WTRU configured maximum output for the carrier. 10. The method of claim 1, wherein the power headroom is for a primary cell. 11. The method of claim 1, wherein the reference DCI format is a DCI format 1A. 12. The method of claim 1, wherein determining the power headroom using the PUSCH transmit power and the PUCCH transmit power comprises: determining a maximum transmit power for a carrier; andcalculating the power headroom using the maximum transmit power for the carrier, the PUSCH transmit power, and the PUCCH transmit power. 13. The WTRU of claim 2, wherein the WTRU is further configured to determine that the WTRU is configured for simultaneous PUSCH/PUCCH transmission. 14. The WTRU of claim 2, wherein the power headroom is a first power headroom, the PUSCH transmit power is a first PUSCH transmit power, and the processor is further configured to: determine a second power headroom using a second PUSCH transmit power; andsend the first power headroom and the second power headroom in the same subframe. 15. The WTRU of claim 14, wherein the first power headroom is for a carrier, the second power headroom is for the carrier, the first PUSCH transmit power is for the carrier, and the second PUSCH transmit power for the carrier. 16. The WTRU of claim 14, wherein the first power headroom is for a first carrier, the second power headroom is for a second carrier, the first PUSCH transmit power is for the first carrier, and the second PUSCH transmit power is for the second carrier. 17. The WTRU of claim 2, wherein the processor is further configured to determine that a carrier has a PUSCH transmission in a subframe. 18. The WTRU of claim 2, wherein the processor is further configured to determine a maximum power for a carrier. 19. The WTRU of claim 18, wherein the maximum power for the carrier is a WTRU configured maximum output power for the carrier. 20. The WTRU of claim 2, wherein the power headroom is for a primary cell. 21. The WTRU of claim 2, wherein the reference DCI format is a DCI format 1A. 22. The WTRU of claim 2, wherein the processor is configured to determine the power headroom using the PUSCH transmit power and the PUCCH transmit power comprises: determining a maximum transmit power for a carrier; andcalculating the power headroom using the maximum transmit power for the carrier, the PUSCH transmit power, and the PUCCH transmit power.