Patent ID: 8848600
Filing Date: 2014-09-30
Classification: H04B,H04L

Abstract:
1. 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 plurality of transport blocks to a user equipment (UE) through a physical downlink control channel (PDCCH); receiving the plurality of transport blocks scheduled by the DCI from the user equipment (UE); transmitting information indicating acknowledgement (ACK) or negative acknowledgement (NACK) of each of the received transport blocks to the user equipment (UE) through a physical hybrid-automatic repeat request indicator channel (PHICH); and receiving retransmission of a transport block indicating NACK from the user equipment (UE), wherein, if the number of NACK transport blocks is different from the number of a plurality of transport blocks indicated by the PDCCH, a precoding matrix for the same number of transmission layers as the number of layers corresponding to the NACK transport block is used in the retransmission.