Method for efficient control signaling of two codeword to one codeword transmission

A method for configuring a control information in a multiple input-multiple output (MIMO) wireless communication apparatus where there has been a transmission failure for one or more of spatially multiplexed first and second transport blocks, comprising:

• generating a Physical Downlink Control CHannel (PDCCH) control signal for scheduling retransmission of a selected transport block over a Physical Downlink Shared Channel (PDSCH), where the PDCCH control signal comprises:
• a modulation and coding scheme field for signaling that the selected transport block has a transport block size specified from a previous PDCCH for the selected transport block;
• and
• a transport block identifier bit for indicating that the selected transport block is the first transport block when the transport block identifier bit has a first value, and for indicating that the selected transport block is the second transport block when the transport block identifier bit has a second value.

A method for receiving a retransmission of a transport block in a multiple input-multiple output (MIMO) wireless communication apparatus, comprising:

• receiving a transmission of spatially multiplexed first and second transport blocks under control of a first Physical Downlink Control CHannel (PDCCH) control signal which uses downlink control information (DCI) format to convey first and second transport block size values for the first and second transport blocks;
• storing the first and second transport block size values for the first and second transport blocks;
• detecting a transmission failure for at least the first transport block;
• sending a request to retransmit the first transport block;
• receiving a second PDCCH control signal in a predetermined DCI format for scheduling retransmission of the first transport block over a single transmission layer, where the second PDCCH control signal comprises HARQ process id bits, new data indicator (NDI) bits, modulation and coding scheme (MCS) bits, and resource block assignment bits comprising a transport block identifier bit and resource indication bits;
• processing the HARQ process id bits and the NDI bits from the second PDCCH control signal to determine that the second PDCCH control signal is scheduling the retransmission of a selected transport block;
• processing the MCS bits and the transport block identifier bit from the second PDCCH control signal to select a transport block size value for the first transport block from the stored first and second transport block size values;
• identifying a plurality of time-frequency resource allocations associated with the selected transport block size value;
• and
• processing the resource indication bits to select a time-frequency resource allocation from the plurality of time-frequency resource allocations for use in receiving the retransmitted first transport block;
• wherein the DCI format is associated with a transmission rank of at least two.

A method for receiving a retransmission of a transport block in a wireless communication apparatus, comprising:

• receiving a first transport block under control of a first physical downlink control channel (PDCCH) control signal which uses downlink control information to convey a first transport block size value for the first transport block;
• storing the first transport block size value for the first transport block;
• detecting a transmission failure for at least the first transport block;
• sending a request to retransmit the first transport block;
• receiving a second PDCCH control signal for scheduling retransmission of the first transport block over a single transmission layer, where the second PDCCH control signal comprises:
• a first control field for signaling that the first transport block being retransmitted has the first transport block size value specified in the first PDCCH control signal;
• and
• a resource allocation field comprising one or more predetermined control bits and one or more selection bits for selecting a first time-frequency resource allocation from a plurality of time-frequency resource allocations corresponding to the first transport block size value;
• processing at least the first control field from the second PDCCH control signal to determine that the second PDCCH control signal is scheduling a retransmission of the first transport block;
• identifying a plurality of time-frequency resource allocations associated with the first transport block size value;
• and
• processing at least the one or more selection bits to select a time-frequency resource allocation from a plurality of time-frequency resource allocations corresponding to the first transport block size value for use in receiving the retransmitted first transport block.