Patent ID: 8819501

Claim:
A method for transmitting control information of uplink (UL) MIMO (Multiple Input Multiple Output) transmission by a base station (BS), the method comprising: transmitting downlink control information (DCI) scheduling UL transmission of a first transport block (TB) and a second transport block (TB) to a user equipment (UE) through a physical downlink control channel (PDCCH); receiving the first and second transport blocks (TBs) scheduled by the DCI from the user equipment (UE); transmitting information indicating acknowledgement (ACK) or negative acknowledgement (NACK) of each of the received first and second transport blocks (TBs) to the user equipment (UE), using a first physical hybrid-automatic repeat request indicator channel (PHICH) resource with respect to the first transport block (TB), and using a second PHICH resource with respect to the second transport block (TB); receiving retransmission of a negative-acknowledged transport block (NACK TB) from the user equipment (UE); and transmitting, if the number of NACK transport blocks is different from the number of a plurality of transport blocks indicated by the PDCCH, ACK or NACK indication information for retransmission of the negative-acknowledged transport block (NACK TB) to the user equipment (UE) using the first PHICH resource.