Wireless communication method and apparatus for transferring buffered uplink data from a wtru to a node-b

A method implemented by a wireless transmit/receive unit (WTRU) comprising:

• transmitting an indication of uplink data on an uplink control channel on a condition that uplink data is in a buffer of the WTRU;
• wherein the WTRU is configured to use the uplink control channel and an uplink data channel;
• receiving, based on the transmitted indication of uplink data, an uplink scheduling message;
• and
• transmitting, based on the received uplink scheduling message, uplink data on the uplink data channel;
• wherein the transmitted uplink data is included in a medium access control (MAC) protocol data unit (PDU);
• wherein the MAC PDU includes traffic volume information;
• and wherein a header of the MAC PDU includes a field indicating the presence of the traffic volume information.

A Node-B comprising:

• an antenna;
• a receiver;
• and
• a transmitter;
• and
• the receiver is configured to receive an indication of uplink data on an uplink control channel from a WTRU;
• wherein the Node-B is configured to use the uplink control channel and an uplink data channel;
• the transmitter is configured to transmit an uplink scheduling message based on the received indication of uplink data;
• and
• the receiver is further configured to receive uplink data on the uplink data channel based on the transmitted uplink scheduling message;
• wherein the received uplink data is included in a medium access control (MAC) protocol data unit (PDU);
• wherein the MAC PDU includes traffic volume information;
• and wherein a header of the MAC PDU includes a field indicating the presence of the traffic volume information.