System and Method for Uplink MIMO Transmission

A method by a user equipment (UE) for retransmission on uplink for multiple-input multiple-output (MIMO) in a network, the method comprising:

• selecting both a first transport block size (TBS) for transmission on a primary stream and a second TBS for transmission on a secondary stream according to an enhanced dedicated channel (E-DCH) transport format combination (E-TFC) selection procedure for rank-2 transmission;
• selecting a transmission power for the primary stream in accordance with the first TBS of the primary stream;
• determining whether the second TBS is larger than or equal to a TBS used in an original failed transmission of data;
• if the second TBS is larger than or equal to the TBS used in the original failed transmission of data, selecting a transmission power for the secondary stream as the transmission power for the primary stream;
• and
• retransmitting, on the secondary stream, the data in the failed transmission using the TBS used in the original failed transmission.

A method by a user equipment (UE) for transmission on uplink for multiple-input multiple-output (MIMO) in a network, the method comprising:

• selecting both a first transport block size (TBS) for transmission on a primary stream and a second TBS for transmission on a secondary stream according to an enhanced dedicated channel (E-DCH) transport format combination (E-TFC) selection procedure;
• determining whether the first TBS or the second TBS is less than a defined minimum TBS;
• and
• if any of the first TBS and the second TBS is less than the minimum TBS, selecting rank-1 for uplink transmission of that TBS regardless of rank indication by the network.

A user device configured for retransmission on uplink for multiple-input multiple-output (MIMO) in a network, the user device comprising:

• a processor;
• and
• a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
• select both a first transport block size (TBS) for transmission on a primary stream and a second TBS for transmission on a secondary stream according to an enhanced dedicated channel (E-DCH) transport format combination (E-TFC) selection procedure for rank-2 transmission;
• select a transmission power for the primary stream in accordance with the first TBS of the primary stream;
• determine whether the second TBS is larger than or equal to a TBS used in an original failed transmission of data;
• if the second TBS is larger than or equal to a TBS used in the original failed transmission, select a transmission power for the secondary stream according to the transmission power for the primary stream;
• and
• retransmit the data on the secondary stream using a TBS used in the original failed transmission.

A user device configured for transmission on uplink for multiple-input multiple-output (MIMO) in a network, the user device comprising:

• a processor;
• and
• a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
• select a first transport block size (TBS) for transmission on a primary stream and a second TBS for transmission on a secondary stream according to an enhanced dedicated channel (E-DCH) transport format combination (E-TFC) selection procedure;
• determine whether each of the first TBS and the second TBS is less than a defined minimum TBS;
• and
• if any of the first TBS or the second TBS is less than the minimum TBS, select rank-1 for uplink transmission of that TBS regardless of rank indication by the network.