Method for transmitting uplink control information of terminal in wireless communication system and device using the method

1. A method for transmitting uplink control information (UCI) by a user equipment (UE) in a wireless communication system, the method comprising:

determining a number of transport blocks (TBs) to transmit using a physical uplink shared channel (PUSCH) supporting multiple-layers transmission;

determining corresponding UCI to be included in each transport block based on the determined number of transport blocks; and

transmitting each transport block including the corresponding UCI to a base station,

wherein when the number of TBs is determined as two, at least one of acknowledgement/not-acknowledgement (ACK/NACK) information or a rank indicator (RI) is included in a first transport block of two transport blocks, and at least one of a channel quality indicator (CQI) or a precoding matrix index (PMI) is included in a second transport block of the two transport blocks,

wherein the first transport block is mapped to more layers than the second transport block and a Modulation Coding Scheme (MCS) of the first transport block is higher than an MCS of the second transport block,

wherein only the UCI is transmitted on the PUSCH without data transmission thereon,

wherein the method further comprises receiving a downlink control information (DCI) format from the base station by the user equipment, and

wherein only when the DCI format is a specific DCI format or a number of cells configured for the user equipment is greater than a threshold value, only the UCI is transmitted on the PUSCH without data transmission thereon.

2. The method of claim 1 , further comprising:

when one transport block is to be transmitted using two layers of the PUSCH, duplicating UCI to be transmitted to form duplicated UCI;

mapping the UCI to be transmitted to a first layer of the two layers;

mapping the duplicated UCI to a second layer of the two layer; and

transmitting the mapped UCIs using the layers.

3. A user equipment (UE) comprising:

a radio frequency (RF) unit configured to receive and transmit a RF signal; and

a processor coupled to the RF unit, wherein the processor is configured for:

determining a number of transport blocks (TBs) to transmit using a physical uplink shared channel (PUSCH) supporting multiple-layers transmission;

determining corresponding UCI to be included in each transport block based on the determined number of transport blocks; and

controlling the RF unit to transmit each transport block including the corresponding UCI to a base station,

wherein when the number of TBs is determined as two, at least one of acknowledgement/not-acknowledgement (ACK/NACK) information or a rank indicator (RI) is included in a first transport block of two transport blocks, and at least one of a channel quality indicator (CQI) or a precoding matrix index (PMI) is included in a second transport block of the two transport blocks,

wherein the first transport block is mapped to more layers than the second transport block and a Modulation Coding Scheme (MCS) of the first transport block is higher than an MCS of the second transport block,

wherein only the UCI is transmitted on the PUSCH without data transmission thereon,

wherein the processor is further configured for receiving a downlink control information (DCI) format from the base station, and

wherein only when the DCI format is a specific DCI format or a number of cells configured for the user equipment is greater than a threshold value, only the UCI is transmitted on the PUSCH without data transmission thereon.

4. The UE of claim 3 , wherein the processor is further configured for:

when one transport block is to be transmitted using two layers of the PUSCH, duplicating UCI to be transmitted to form duplicated UCI;

mapping the UCI to be transmitted to a first layer of the two layers;

mapping the duplicated UCI to a second layer of the two layer; and

controlling the RF unit to transmit the mapped UCIs using the layers.