HARQ in spatial multiplexing MIMO system
A method and apparatus for signaling scheduling information in a spatial multiplexing wireless communications system, as well as corresponding methods and apparatus for processing such signaling information, are disclosed. Signaling scheduling information includes scheduling first and second transport blocks for simultaneous transmission during a first transmission interval on first and second data substreams, respectively, and assigning a single re-transmission process identifier for the first transmission interval and transmitting first scheduling information for the first transmission interval. The first scheduling information includes the re-transmission process identifier and first disambiguation data. Additionally, at least one of the first and second transport blocks is scheduled for re-transmission during a second transmission interval. Second scheduling information for the second transmission interval is also transmitted; the second scheduling information including the re-transmission process identifier and second disambiguation data.
1. A method for receiving a dual stream transmission in a system employing Hybrid Automatic Repeat Request (HARQ) retransmission, the method comprising:
receiving a first transport block with a first sub-process on a first stream, and a second transport block with a second sub-process on a second stream; and
determining which sub-process is transmitted on which stream based on a single re-transmission identifier and a HARQ process identifier.
2. The method of claim 1 wherein the HARQ process identifier comprises paired first and second sub-process identifiers, and wherein values of a first plurality of bits in the first sub-process identifier is identical to a second plurality of bits in the second sub-process identifier.
3. The method of claim 2 wherein the first sub-process identifier comprises a first bit indicating that the first sub-process was transmitted on the first stream, and wherein the second sub-process identifier comprises a second bit indicating that the second sub-process was transmitted on the second stream.
4. The method according to claim 1 , wherein the dual stream transmission is a MIMO transmission.
5. The method according to claim 1 , further comprising:
transmitting a negative acknowledgement for one of the first and second transport blocks; and
receiving a retransmission of the one of the first and second transport blocks on a same or a different stream.
6. A user equipment (UE) configured to receive a dual stream transmission in a system employing Hybrid Automatic Repeat Request retransmission, the UE comprising:
a processing circuit; and
a receiver operatively connected to the processing circuit and configured to:
receive a first transport block with a first sub-process on a first stream, and a second transport block with a second sub-process on a second stream; and
determine which sub-process is transmitted on which stream based on a single re-transmission identifier and a HARQ process identifier.
7. The user equipment of claim 6 wherein the HARQ process identifier comprises paired first and second sub-process identifiers, and wherein values of a first plurality of bits in the first sub-process identifier is identical to a second plurality of bits in the second sub-process identifier.
8. The user equipment of claim 7 wherein the first sub-process identifier comprises a first bit indicating that the first sub-process was transmitted on the first stream, and wherein the second sub-process identifier comprises a second bit indicating that the second sub-process was transmitted on the second stream.
9. The user equipment according to claim 6 , wherein the dual stream transmission is a MIMO transmission.
10. The user equipment according to claim 6 , further comprising:
a transmitter configured to transmit a negative acknowledgement for one of the first and second transport blocks; and
wherein the receiver is further configured to receive a retransmission of the one of the first and second transport blocks on a same or a different stream.
11. A method for transmitting a dual stream transmission in a system employing Hybrid Automatic Repeat Request (HARQ) retransmission, the method comprising:
transmitting a first transport block with a first sub-process on a first stream, wherein the first sub-process is identifiable by a single sub-process address; and
transmitting a second transport block with a second sub-process on a second stream, wherein the first and second sub-processes belong to a same paired process identifier.
12. The method of claim 11 wherein first and second sub-process identifiers comprise a HARQ identifier, and wherein values of a first plurality of bits in the first sub-process identifier is identical to a second plurality of bits in the second sub-process identifier.
13. The method of claim 12 wherein the first sub-process identifier comprises a first bit indicating that the first sub-process was transmitted on the first stream, and wherein the second sub-process identifier comprises a second bit indicating that the second sub-process was transmitted on the second stream.
14. The method according to claim 11 , wherein the dual stream transmission is a MIMO transmission.
15. The method according to claim 11 , further comprising:
receiving a negative acknowledgement for one of the first and second transport blocks; and
retransmitting the one of the first and second transport blocks on a same or a different stream.
16. A NodeB configured to transmit a dual stream transmission in a system employing Hybrid Automatic Repeat Request (HARQ) retransmission, the NodeB comprising:
a processing circuit; and
a transmitter operatively connected to the processing circuit and configured to:
transmit a first transport block with a first sub-process on a first stream, wherein the first sub-process is identifiable by a single sub-process address; and
transmit a second transport block with a second sub-process on a second stream, wherein the first and second sub-processes belong to a same paired process identifier.
17. The NodeB of claim 16 wherein first and second sub-process identifiers comprise a HARQ identifier, and wherein values of a first plurality of bits in the first sub-process identifier is identical to a second plurality of bits in the second sub-process identifier.
18. The NodeB of claim 17 wherein the first sub-process identifier comprises a first bit indicating that the first sub-process was transmitted on the first stream, and wherein the second sub-process identifier comprises a second bit indicating that the second sub-process was transmitted on the second stream.
19. The NodeB according to claim 16 , wherein the dual stream transmission is a MIMO transmission.
20. The NodeB according to claim 16 , further comprising:
a receiver configured to receive a negative acknowledgement for one of the first and second transport blocks; and
wherein the transmitter is further configured to retransmit the one of the first and second transport blocks on a same or a different stream.