Method and apparatus for power control of sounding reference signal (srs) transmission

A wireless transmitter/receiver unit (WTRU) comprising:

• a processor configured to determine an unconstrained SRS power level for a plurality of component carriers;
• the processor configured to select a lesser of the unconstrained SRS power level and a component carrier based maximum power level as a constrained SRS power level for each component carrier;
• the processor further configured to set an SRS transmit power level for each component carrier to the selected constrained SRS power level;
• and
• a transmitter configured to simultaneously transmit the plurality of component carriers.

A wireless transmitter/receiver unit (WTRU) comprising:

• a processor configured to determine an unconstrained SRS power level for each carrier of a plurality of carriers;
• the processor configured to select a lesser of the unconstrained SRS power level and a maximum power level as a constrained SRS power level for each carrier;
• the processor further configured to set an SRS transmit power level for each carrier to the constrained SRS power level;
• a transmitter configured to simultaneously transmit the plurality of carriers simultaneously over a plurality of antenna ports.