A method and apparatus for uplink transmission is disclosed. A wireless transmit/receive unit (WTRU) transmits a message to a Node-B, wherein the message is selected from at least a first type, a second type, and a third type. The first type of message indicates that the WTRU has uplink buffered data to transmit and the WTRU requires uplink resources for transmission of uplink data. The second type of message includes a plurality of indications, wherein each indication indicates an amount of uplink buffered data associated with at least one logical channel, wherein each logical channel is associated with a priority. The third type of message indicates an amount of uplink buffered data and has less information than the second type of message.