Method and apparatus for power control for wireless transmissions on multiple component carriers associated with multiple timing advances

A wireless transmit/receive unit (WTRU) for power control for wireless transmissions on multiple component carriers associated with multiple timing advances, the WTRU comprising:

• a processor configured to calculate a transmit power of physical channels in each subframe to be transmitted on a plurality of component carriers that belong to at least two different timing advance groups (TAGs), wherein each TAG is associated with a separate timing advance value for uplink transmissions;
• the processor is further configured to scale a transmit power of at least one of the physical channels in each subframe on a condition that a sum of a transmit power of the physical channels in the same subframe is to exceed a configured maximum WTRU output power for that subframe;
• and
• the processor is further configured to adjust a transmit power of at least one of the physical channels on a condition that a sum of a transmit power of the physical channels in an overlapping portion of a subframe of a less advanced TAG and a following consecutive subframe of a more advanced TAG is to exceed a configured maximum WTRU output power for the overlapping portion such that a sum of a transmit power of the physical channels in the overlapping portion does not exceed the configured maximum WTRU output power for the overlapping portion.