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

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.

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;
• 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.

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;
• comparing 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
• setting the power level of the second uplink channel to whichever of the power difference or the determined value is lower.

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;
• 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.