Method And Apparatus For Handling Uplink Transmissions Using Multiple Uplink Carriers

A wireless transmit/receive unit (WTRU) for uplink transmission using multiple uplink carriers, the WTRU comprising:

• a transmitter configured to transmit via multiple uplink carriers;
• a receiver configured to receive via at least one downlink carrier;
• and
• a processor configured to select a highest priority dedicated channel medium access control (MAC-d) flow to be transmitted on a transmission time interval (TTI), perform uplink carrier selection and enhanced dedicated channel (E-DCH) transport format combination (E-TFC) selection to select an uplink carrier among a plurality of uplink carriers and select an E-TFC for at least one new E-DCH transmission based on at least one of a maximum supported payload, a remaining scheduled grant payload, or a remaining non-scheduled grant payload, and generate a medium access control (MAC) protocol data unit (PDU) for E-DCH transmission via the selected uplink carrier based on the selected E-TFC.