A wireless transmit/receive unit (WTRU) determines (1) whether the WTRU is transmitting as much scheduled data as allowed by a current Serving_Grant, (2) whether the WTRU has enough power to transmit at higher data rate, and (3) based on a same power offset as a currently selected E-DCH transport format combination (E-TFC), whether total E-DCH buffer status (TEBS) would require more than predetermined period to be transmitted with the current Serving_Grant×a ratio of active processes to a total number of processes. If criteria (1)-(3) are met, the WTRU sets the happy bit to “unhappy.” If MAC-i/is is configured, the WTRU evaluates criteria (2) by identifying an E-TFC that has a transport block size at least x bits larger than a transport block size of the currently selected E-TFC, and determining whether the identified E-TFC is supported based on a same power offset as the currently selected E-TFC.