Method and apparatus for assigning hybrid-automatic repeat request processes
A method and apparatus for assigning a hybrid-automatic repeat request (H-ARQ) process in a wireless transmit/receive unit (WTRU) to support enhanced uplink (EU) data transmission. Configuration parameters for enhanced uplink (EU) operation are received. The configuration parameters include a priority associated with a medium access control for dedicated channel (MAC-d) flow and a maximum number of H-ARQ transmissions associated with the MAC-d flow. Data is selected for transmission over an enhanced dedicated channel (E-DCH) based on a priority of the MAC-d flow, wherein data with the highest priority is selected. On a condition that the selected data is new data that was not previously transmitted, an available H-ARQ process is assigned for supporting transmission of the selected data, and the selected data is transmitted over the E-DCH using the assigned H-ARQ process. On a condition that the selected data was previously transmitted, the selected data is retransmitted over the E-DCH using the same H-ARQ process that was assigned to previously transmit the selected data. A transmission count is incremented in response to transmitting or retransmitting the selected data. A determination is made of whether the transmission count is at least equal to the maximum number of H-ARQ transmissions. The selected data is discarded in response to a determination that the transmission count is at least equal to the maximum number of H-ARQ transmissions.
1. A method for assigning a hybrid-automatic repeat request (H-ARQ) process in a wireless transmit/receive unit (WTRU) for supporting enhanced uplink (EU) data transmission, the method comprising:
receiving configuration parameters for a plurality of medium access control for dedicated channel (MAC-d) flows, wherein the configuration parameters include a priority associated with each MAC-d flow and a maximum number of H-ARQ transmissions associated with each MAC-d flow;
selecting data for transmission over an enhanced dedicated channel (E-DCH) based on a priority associated with at least one of the plurality of MAC-d flows, wherein data of at least one of the plurality of MAC-d flows associated with a highest priority that has data available for transmission is selected;
on a condition that the selected data is new data that was not previously transmitted, assigning an available H-ARQ process for supporting transmission of the selected data, and transmitting the selected data over the E-DCH using the assigned H-ARQ process;
on a condition that the selected data was previously transmitted, transmitting the selected data over the E-DCH using the same H-ARQ process that was assigned to previously transmit the selected data;
incrementing a transmission count in response to transmitting the selected data;
determining whether the transmission count is at least equal to a maximum number of H-ARQ transmissions associated with one of the plurality of MAC-d flows from which the data for transmission was selected; and
discarding the selected data in response to a determination that the transmission count is at least equal to a maximum number of H-ARQ transmissions associated with one of the plurality of MAC-d flows from which the data for transmission was selected.
2. The method of claim 1 wherein the data is selected by a medium access control for enhanced dedicated channel (MAC-e).
3. The method of claim 1 further comprising releasing the assigned H-ARQ process on a condition that feedback information is received, wherein the feedback information indicates that the transmission of the selected data was successful.
4. The method of claim 1 further comprising retransmitting the selected data on a condition that no feedback information is received regarding the transmission.
5. The method of claim 1 further comprising setting the transmission count to zero on a condition that the selected data was transmitted a maximum number of times.
6. The method of claim 1 further comprising setting the transmission count to zero on a condition that the selected data is new data that was not previously transmitted.
7. The method of claim 1 further comprising retransmitting the selected data on a condition that the WTRU receives feedback information indicating that the transmission was unsuccessful.
8. The method of claim 1 further comprising retransmitting the selected data on a condition that the transmission count is less than a maximum number of H-ARQ transmissions associated with a MAC-d flow from which the data for transmission was selected.
9. A wireless transmit/receive unit (WTRU) for assigning a hybrid automatic repeat request (H-ARQ) process for supporting enhanced uplink (EU) transmission comprising:
a receiver configured to receive configuration parameters for a plurality of medium access control for dedicated channel (MAC-d) flows, wherein the configuration parameters include a priority associated with each MAC-d flow and a maximum number of H-ARQ transmissions associated with each MAC-d flow;
a controller configured to select data for transmission over an enhanced dedicated channel (E-DCH) based on a priority associated with at least one of the plurality of MAC-d flows, wherein data of at least one of the plurality of MAC-d flows associated with a highest priority that has data available for transmission is selected;
on a condition that the selected data is new data that was not previously transmitted, the controller is configured to assign an available H-ARQ process for supporting transmission of the selected data, and a transmitter is configured to transmit the selected data over the E-DCH using the assigned H-ARQ process;
on a condition that the selected data was previously transmitted, the transmitter is configured to transmit the selected data over the E-DCH using the same H-ARQ process that was assigned to previously transmit the selected data;
a transmission counter configured to indicate a transmission count, wherein the controller is configured to increment the transmission counter in response to transmitting the selected data;
wherein the controller is further configured to determine whether the transmission counter is at least equal to a maximum number of H-ARQ transmissions associated with one of the plurality of MAC-d flows from which the data for transmission was selected; and
the controller is further configured to discard the selected data in response to a determination that the transmission counter is at least equal to a maximum number of transmissions associated with one of the plurality of MAC-d flows from which the data for transmission was selected.
10. The WTRU of claim 9 wherein the data is selected by a medium access control for enhanced dedicated channel (MAC-e).
11. The WTRU of claim 9 wherein the controller is further configured to release the assigned H-ARQ process on a condition that the WTRU receives feedback information, wherein the feedback information indicates that the transmission of the selected data was successful.
12. The WTRU of claim 9 wherein the transmitter is configured to retransmit the selected data on a condition that the WTRU does not receive feedback information regarding the transmission.
13. The WTRU of claim 9 wherein the controller is configured to set the transmission counter to zero on a condition that the selected data was transmitted a maximum number of times.
14. The WTRU of claim 9 wherein the controller is configured to set the transmission counter to zero on a condition that the selected data is new data that was not previously transmitted.
15. The WTRU of claim 9 wherein the transmitter is configured to retransmit the selected data on a condition that the WTRU receives feedback information indicating that the transmission was unsuccessful.
16. The WTRU of claim 9 wherein the transmitter is configured to retransmit the selected data on a condition that the transmission counter is less than a maximum number of H-ARQ transmissions associated with a MAC-d flow from which the data for transmission was selected.