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, wherein HARQ process identifiers are grouped into pairs of sub-process identifiers, such that each sub-process is identifiable by a four-bit address, and wherein three bits have identical values in both sub-processes in a pair, and wherein one bit indicates which sub-process is transmitted on which stream, the method comprising:
receiving four bits corresponding to a single sub-process address;
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, based on the single sub-process address and a pairing of sub-process identifiers, which sub-process is transmitted on which stream.
2. The method according to claim 1 , wherein the dual stream transmission is a MIMO transmission.
3. 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.
4. A user equipment configured to receive a dual stream transmission in a system employing Hybrid Automatic Repeat Request retransmission, wherein HARQ process identifiers are grouped into pairs of sub-process identifiers, such that each sub-process is identifiable by a four-bit address, and wherein three bits have identical values in both sub-processes in a pair, and wherein one bit indicates which sub-process is transmitted on which stream, the user equipment comprising:
a processing circuit; and
a receiver operatively connected to the processing circuit and configured to:
receive four bits corresponding to a single sub-process address;
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, based on the single sub-process address and a pairing of sub-process identifiers, which sub-process is transmitted on which stream.
5. The user equipment according to claim 4 , wherein the dual stream transmission is a MIMO transmission.
6. The user equipment according to claim 4 , 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.
7. A method for transmitting a dual stream transmission in a system employing Hybrid Automatic Repeat Request (HARQ) retransmission, wherein HARQ process identifiers are grouped into pairs of sub-process identifiers, such that each sub-process is identifiable by a four-bit address, and wherein three bits have identical values in both sub-processes in a pair, and wherein one bit indicates which sub-process is transmitted on which stream, the method comprising:
transmitting four bits corresponding to a single sub-process address;
transmitting a first transport block with a first sub-process, identifiable by the single sub-process address, on a first stream; 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 pair.
8. The method according to claim 7 , wherein the dual stream transmission is a MIMO transmission.
9. The method according to claim 7 , 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.
10. A NodeB configured to transmit a dual stream transmission in a system employing Hybrid Automatic Repeat Request (HARQ) retransmission, wherein HARQ process identifiers are grouped into pairs of sub-process identifiers, such that each sub-process is identifiable by a four-bit address, and wherein three bits have identical values in both sub-processes in a pair, and wherein one bit indicates which sub-process is transmitted on which stream, the NodeB comprising:
a processing circuit; and
a transmitter operatively connected to the processing circuit and configured to:
transmit four bits corresponding to a single sub-process address;
transmit a first transport block with a first sub-process, identifiable by the single sub-process address, on a first stream; 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 pair.
11. The NodeB according to claim 10 , wherein the dual stream transmission is a MIMO transmission.
12. The NodeB according to claim 10 , 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.