Method and device for determining precoding information for uplink multi-antenna transmission

A method for receiving uplink (UL) data using a hybrid automatic repeat request (HARQ) scheme by a base station (BS) in a wireless communication system supporting Multiple Input Multiple Output (MIMO) transmission, the method comprising:

• transmitting an uplink (UL) grant to a user equipment (UE), and receiving a plurality of data blocks transmitted on the basis of the UL grant from the user equipment (UE);
• transmitting control information indicating a negative acknowledgement (NACK) of some data block from among the plurality of data blocks to the user equipment (UE);
• and
• receiving the NACK-indicated data block from the user equipment (UE) retransmitted using a precoding matrix selected by the user equipment (UE) according to a predetermined rule shared between the user equipment (UE) and the base station (BS).

A user equipment (UE) for transmitting uplink (UL) data using a hybrid automatic repeat request (HARQ) scheme in a wireless communication system supporting Multiple Input Multiple Output (MIMO) transmission, the user equipment (UE) comprising:

• a transmission (Tx) module for transmitting an uplink (UL) signal to a base station (BS);
• a reception (Rx) module for receiving a downlink (DL) signal from the base station (BS);
• and
• a processor for controlling the user equipment (UE) including the reception (Rx) module and the transmission (Tx) module,
• wherein the processor transmits a plurality of data blocks to the base station (BS) on the basis of the uplink (UL) grant through the transmission (Tx) module, receives control information indicating a negative acknowledgement (NACK) of some data block from among the plurality of data blocks from the base station (BS) through the reception (Rx) module, selects a precoding matrix to be applied to a data block indicated by the NACK according to a predetermined rule shared between the user equipment (UE) and the base station (BS), and retransmits the NACK-indicated data block to the base station (BS) using the selected precoding matrix through the transmission (Tx) module.

A base station (BS) for receiving uplink (UL) data using a hybrid automatic repeat request (HARQ) scheme in a wireless communication system supporting Multiple Input Multiple Output (MIMO) transmission, the base station (BS) comprising:

• a transmission (Tx) module for transmitting a downlink (DL) signal to a user equipment (UE);
• a reception (Rx) module for receiving an uplink (UL) signal from the user equipment (UE);
• and
• a processor for controlling the base station (BS) including the reception (Rx) module and the transmission (Tx) module,
• wherein the processor transmits an uplink (UL) grant to a user equipment (UE), and receives a plurality of data blocks transmitted on the basis of the UL grant from the user equipment (UE) through the reception (Rx) module;
• transmits control information indicating a negative acknowledgement (NACK) of some data block from among the plurality of data blocks to the user equipment (UE) through the transmission (Tx) module;
• and receives the NACK-indicated data block from the user equipment (UE) retransmitted using a precoding matrix selected by the user equipment (UE) according to a predetermined rule shared between the user equipment (UE) and the base station (BS).