Method and apparatus for control of enhanced dedicated channel transmissions

1. A method, implemented by a wireless transmit/receive unit (WTRU), the method comprising:

receiving a plurality of primary absolute grants for enhanced dedicated channel (E-DCH) transmission, wherein the plurality of primary absolute grants are associated with a transmission time interval (TTI);

receiving at least one relative grant for E-DCH transmission, wherein the at least one relative grant is associated with the TTI;

determining at least one serving grant for E-DCH transmission based on at least one primary absolute grant of the plurality of primary absolute grants and the at least one relative grant;

identifying a hybrid automatic repeat request (H-ARQ) process for use for the TTI;

determining whether the identified H-ARQ process is available for scheduled data, wherein only an active H-ARQ process is used for transmission of scheduled data and a non-active H-ARQ process is not used for transmission of scheduled data;

determining whether scheduled data is allowed to be transmitted in the TTI based at least on the identified H-ARQ process;

on a condition that the identified H-ARQ process is available for scheduled data and scheduled data is allowed to be transmitted in the TTI, allocating scheduled data for transmission in the TTI;

calculating a remaining power available for the TTI based on a maximum allowed power for the WTRU;

performing E-DCH transport format combination (E-TFC) restriction based on the remaining power;

selecting an E-TFC from a set of E-TFCs remaining after E-TFC restriction, wherein the E-TFC selection is based at least on the at least one serving grant; and

transmitting the allocated data in accordance with the identified H-ARQ process.

2. The method of claim 1 wherein the allocating scheduled data for transmission further comprises:

concatenating multiple medium access control (MAC) for dedicated channel (MAC-d) protocol data units (PDUs) into at least one MAC-es PDU; and

multiplexing the at least one MAC-es PDU into one medium access control for enhanced uplink (MAC-e) PDU.

3. The method of claim 1 wherein a primary absolute grant is received over an E-DCH absolute grant channel (E-AGCH).

4. The method of claim 1 wherein a relative grant is received over an E-DCH relative grant channel (E-RGCH).

5. The method of claim 1 further comprising receiving feedback information regarding the transmitted data, wherein the feedback information is received over an E-DCH H-ARQ indicator channel (E-HICH).

6. A wireless transmit/receive unit (WTRU) comprising:

circuitry configured to receive a plurality of primary absolute grants for enhanced dedicated channel (E-DCH) transmission, wherein the plurality of primary absolute grants are associated with a transmission time interval (TTI);

circuitry configured to receive at least one relative grant for E-DCH transmission, wherein the at least one relative grant is associated with the TTI;

circuitry configured to determine at least one serving grant for E-DCH transmission based on at least one primary absolute grant of the plurality of primary absolute grants and the at least one relative grant;

circuitry configured to identify a hybrid automatic repeat request (H-ARQ) process for use for the TTI;

circuitry configured to determine whether the identified H-ARQ process is available for scheduled data, wherein only an active H-ARQ process is used for transmission of scheduled data and a non-active H-ARQ process is not used for transmission of scheduled data;

circuitry configured to determine whether scheduled data is allowed to be transmitted in the TTI based at least on the identified H-ARQ process;

on a condition that the identified H-ARQ process is available for scheduled data and scheduled data is allowed to be transmitted in the TTI, circuitry configured to allocate scheduled data for transmission in the TTI;

circuitry configured to calculate a remaining power available for the TTI based on a maximum allowed power for the WTRU;

circuitry configured to perform E-DCH transport format combination (E-TFC) restriction based on the remaining power;

circuitry configured to select an E-TFC from a set of E-TFCs remaining after E-TFC restriction, wherein the E-TFC selection is based at least on the at least one serving grant; and

circuitry configured to transmit the allocated data in accordance with the identified H-ARQ process.

7. The WTRU of claim 6 wherein the circuitry configured to allocate scheduled data for transmission further comprises:

circuitry configured to concatenate multiple medium access control (MAC) for dedicated channel (MAC-d) protocol data units (PDUs) into at least one MAC-es PDU; and

circuitry configured to multiplex the at least one MAC-es PDU into one medium access control for enhanced uplink (MAC-e) PDU.

8. The WTRU of claim 6 wherein the WTRU is configured to receive a primary absolute grant over an E-DCH absolute grant channel (E-AGCH).

9. The WTRU of claim 6 wherein the WTRU is configured to receive a relative grant over an E-DCH relative grant channel (E-RGCH).

10. The WTRU of claim 6 further comprising circuitry configured to receive feedback information regarding the transmitted data, wherein the WTRU is configured to receive the feedback information over an E-DCH H-ARQ indicator channel (E-HICH).