FIELD: radio engineering, communication.
SUBSTANCE: invention relates to an uplink transmission apparatus and method for a mobile communication system. A base station comprises transmit path circuitry configured to transmit an uplink grant to a subscriber station, the uplink grant indicating a first modulation and coding scheme (MCS) value for a first codeword transmission and a second MCS value for a second codeword transmission; and receive path circuitry configured to receive a multiple-input multiple-output (MIMO) uplink subframe, the MIMO uplink subframe having a first subset of layers used for the first codeword transmission and a second subset of layers used for the second codeword transmission, wherein ACK/NACK information and rank indication (RI) information is repeated on both the first and the second subsets of layers, wherein if the first MCS value is different from the second MCS value, the channel quality information (CQI) is spatially multiplexed onto the subset of layers having a higher MCS value, and wherein if the first MCS value is the same as the second MCS value, the CQI is spatially multiplexed onto the first subset of layers.
EFFECT: transmitting control information uniformly distributed on multiple transmission layers.
20 cl, 12 dwg, 18 tbl
