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) comprising:
a receiver and a processor configured to receive a single downlink control information for a single transport block and a plurality of downlink control information for a plurality of first transport blocks, wherein each of the downlink control information includes a HARQ process identification (ID) associated with a respective transport block and resource mapping information for the respective transport block;
the receiver and the processor are further configured to receive the single transport block in a first time interval or the plurality of transport blocks in a second time interval based on the respective resource mapping information;
the processor is further configured to process the single transport block and the plurality of transport blocks based on the respective HARQ process IDs; and
the processor and a transmitter are configured to transmit on a physical control channel having a first format an ACK/NACK for the single transport block and having a second format a plurality of ACK/NACKs for the plurality of transport blocks; wherein a first format does not include a cyclic redundancy check and the second format includes a cyclic redundancy check.
2. The WTRU of claim 1 wherein the single transport block or the plurality of transport blocks are received over an antenna beam.
3. The WTRU of claim 1 wherein a transmission time of a transport block is variable.
4. The WTRU of claim 1 wherein the transmitted physical control channel of the second format includes channel quality indicators.
5. The WTRU of claim 1 wherein the plurality of ACK/NACKs in the second format are arranged based on information received during call setup.
6. The WTRU of claim 1 wherein the first format and the second format are associated with different transmission powers.
7. A method performed by a wireless transmit receive unit (WTRU), the method comprising:
receiving a single downlink control information for a single transport block and a plurality of downlink control information for a plurality of first transport blocks, wherein each of the downlink control information includes a HARQ process identification (ID) associated with a respective transport block and resource mapping information for the respective transport block;
receiving the single transport block in a first time interval or the plurality of transport blocks in a second time interval based on the respective resource mapping information;
processing the single transport block and the plurality of transport blocks based on the respective HARQ process IDs; and
transmitting on a physical control channel having a first format an ACK/NACK for the single transport block and having a second format a plurality of ACK/NACKs for the plurality of transport blocks; wherein a first format does not include a cyclic redundancy check and the second format includes a cyclic redundancy check.
8. The method of claim 7 wherein the single transport block or the plurality of transport blocks are received over an antenna beam.
9. The method of claim 7 wherein a transmission time of a transport block is variable.
10. The method of claim 7 wherein the transmitted physical control channel of the second format includes channel quality indicators.
11. The method of claim 7 wherein the plurality of ACK/NACKs in the second format are arranged based on information received during call setup.
12. The method of claim 7 wherein the first format and the second format are associated with different transmission powers.
13. A base station comprising:
a transmitter configured to transmit a single downlink control information for a single transport block and a plurality of downlink control information for a plurality of first transport blocks, wherein each of the downlink control information includes a HARQ process identification (ID) associated with a respective transport block and resource mapping information for the respective transport block;
the transmitter further configured to transmit the single transport block in a first time interval or the plurality of transport blocks in a second time interval based on the respective resource mapping information; and
a receiver configured to receive on a physical control channel having a first format an ACK/NACK for the single transport block and having a second format a plurality of ACK/NACKs for the plurality of transport blocks; wherein a first format does not include a cyclic redundancy check and the second format includes a cyclic redundancy check.
14. The base station of claim 13 wherein the single transport block or the plurality of transport blocks are received over an antenna beam.
15. The base station of claim 13 wherein a transmission time of a transport block is variable.
16. The base station of claim 13 wherein the transmitted physical control channel of the second format includes channel quality indicators.
17. The base station of claim 13 wherein the plurality of ACK/NACKs in the second format are arranged based on information received during call setup.
18. The base station of claim 13 wherein the first format and the second format are associated with different transmission powers.