Method and system for supporting multiple hybrid automatic repeat request processes per transmission time interval
A method and apparatus may be used for supporting multiple hybrid automatic repeat request (H-ARQ) processes per transmission time interval (TTI). A transmitter and a receiver may include a plurality of H-ARQ processes. Each H-ARQ process may transmit and receive one TB per TTI. The transmitter may generate a plurality of TBs and assign each TB to a H-ARQ process. The transmitter may send control information for each TB, which may include H-ARQ information associated TBs with the TBs. The transmitter may send the TBs using the associated H-ARQ processes simultaneously per TTI. After receiving the TBs, the receiver may send feedback for each of the H-ARQ processes and associated TBs indicating successful or unsuccessful receipt of each of the TBs to the transmitter. The feedback for multiple TBs may be combined for the simultaneously transmitted H-ARQ processes, (i.e., TBs).
1. A wireless transmit/receive unit (WTRU) for receiving multiple transport blocks (TB)s, the WTRU comprising:
a receiver configured to, in one transmission time interval (TTI), receive control information for each of a plurality of TBs, and to utilize the control information to receive the plurality of TBs;
a processor configured to process the plurality of TBs, to generate a feedback message that includes a channel quality indicator (CQI) and indicates successful or unsuccessful receipt of each of the plurality of TBs, to determine whether to include a cyclic redundancy check (CRC) with the feedback message, and based on the amount of feedback, to select a coding scheme for the feedback message; and
a transmitter configured to transmit the generated feedback message.
2. The WTRU of claim 1 , wherein the receiver is further configured to receive a separate cyclic redundancy check (CRC) for each of the plurality of TBs.
3. The WTRU of claim 1 , wherein the feedback message includes a channel quality indicator (CQI) for each of a plurality of multiple-input multiple-output (MIMO) streams.
4. The WTRU of claim 1 , wherein the control information includes, for each TB of the plurality of TBs, a modulation and coding scheme (MCS) and Hybrid automatic repeat request (HARQ) information, wherein the HARQ information for each TB includes a redundancy version.
5. The WTRU of claim 1 , wherein the control information includes an allocation for each TB of the plurality of TBs to a different spatial stream.
6. The WTRU of claim 1 , wherein feedback for each TB of the plurality of TBs is concatenated in feedback message.
7. The WTRU of claim 1 , wherein a more robust coding scheme is selected as the number of feedback increases.
8. The WTRU of claim 1 , wherein the amount of feedback is based on the number of ACK/NACKs in the feedback message.
9. A Node-B configured to transmit multiple transport blocks (TB)s, the Node-B comprising:
a transmitter and processor configured to, in one transmission time interval (TTI), transmit control information for each of a plurality of TBs, and to utilize the control information to transmit the plurality of TBs; and
a receiver and processor configured to receive and decode a feedback message that includes a channel quality indicator (CQI) and indicates successful or unsuccessful receipt of each of the plurality of TBs at a wireless transmit/receive unit (WTRU), wherein the feedback message is received and decoded based on a modulation and coding scheme that is associated with the amount of feedback.
10. The Node-B of claim 9 , wherein the transmitter and processor is further configured to transmit a separate cyclic redundancy check (CRC) for each of the plurality of TBs.
11. The Node-B of claim 9 , wherein the feedback message includes a channel quality indicator (CQI) for each of a plurality of multiple-input multiple-output (MIMO) streams.
12. The Node-B of claim 9 , wherein the control information includes, for each TB of the plurality of TBs, a modulation and coding scheme (MCS) and Hybrid automatic repeat request (HARQ) information, wherein the HARQ information for each TB includes a redundancy version.
13. The Node-B of claim 9 , wherein the control information includes an allocation for each TB of the plurality of TBs to a different spatial stream.
14. The Node-B of claim 9 , wherein feedback for each TB of the plurality of TBs is concatenated in feedback message.
15. The Node-B of claim 9 , wherein a more robust modulation and coding scheme is selected at the WTRU as the number of feedback increases.
16. The Node-B of claim 9 , wherein the amount of feedback is based on the number of ACK/NACKs in the feedback message.
17. A method performed by wireless transmit/receive unit (WTRU) for receiving multiple transport blocks (TB)s, the method comprising:
receiving a control information for each of a plurality of TBs in a transmission time interval (TTI);
utilizing the control information to receive the plurality of TBs the TTI;
generating a feedback message that includes a channel quality indicator (CQI) and indicates successful or unsuccessful receipt of each of the plurality of TBs;
determining whether to include a cyclic redundancy check (CRC) with the feedback message;
based on the amount of feedback, selecting a coding scheme for the feedback message; and
transmitting the feedback message using the selected coding scheme.
18. The method of claim 17 , further comprising: receiving a separate cyclic redundancy check (CRC) for each of the plurality of TBs.
19. The method of claim 17 , wherein the feedback message includes a channel quality indicator (CQI) for each of a plurality of multiple-input multiple-output (MIMO) streams.
20. The method of claim 17 , wherein the control information includes, for each TB of the plurality of TBs, a modulation and coding scheme (MCS) and Hybrid automatic repeat request (HARQ) information, wherein the HARQ information for each TB includes a redundancy version.
21. The method of claim 17 , wherein the control information includes an allocation for each TB of the plurality of TBs, to a different spatial stream.
22. The method of claim 17 , wherein feedback for each TB of the plurality of TBs is concatenated in feedback message.
23. The method of claim 17 , wherein a more robust coding scheme is selected as the number of feedback increases.
24. The method of claim 17 , wherein the amount of feedback is based on the number of ACK/NACKs in the feedback message.