Method and apparatus for transmitting control information in a wireless communication system

A method for, at a base station (BS), receiving acknowledgement/negative acknowledgement (ACK/NACK) in a wireless communication system, the method comprising:

• configuring a primary carrier and at least two secondary carriers;
• transmitting at least two physical downlink control channel (PDCCH) signals on the at least two secondary carriers, wherein each of the at least two PDCCH signals on the at least two secondary carriers includes resource allocation information and a transmit power control (TPC) field;
• transmitting data as indicated by the resource allocation information in each of the at least two PDCCH signals on the at least two secondary carriers;
• and
• receiving ACK/NACK information for the data via a physical uplink control channel (PUCCH),
• wherein a value of the TPC field in each of the at least two PDCCH signals on the at least two secondary carriers identifies the PUCCH resource as an allocated PUCCH resource for transmitting the ACK/NACK information, and
• wherein the value of the TPC field in each of the at least two PDCCH signals on the at least two secondary carriers is the same.

A user equipment (UE) configured to transmit acknowledgement/negative acknowledgement (ACK/NACK) in a wireless communication system, the UE comprising:

• a radio frequency (RF) unit;
• and
• a processor, wherein the processor
• configures a primary carrier and at least two secondary carriers, and wherein the processor controls the RF unit to:
• receive at least two physical downlink control channel (PDCCH) signals on the at least two secondary carriers, wherein each of the at least two PDCCH signals on the at least two secondary carriers includes resource allocation information and a transmit power control (TPC) field,
• receive data as indicated by the resource allocation information in each of the at least two PDCCH signals on the at least two secondary carriers, and
• transmit ACK/NACK information for the data via a physical uplink control channel (PUCCH),
• wherein a value of the TPC field in each of the at least two PDCCH signals on the at least two secondary carriers identifies the PUCCH resource as an allocated PUCCH resource for transmitting the ACK/NACK information, and
• wherein the value of the TPC field in each of the at least two PDCCH signals on the at least two secondary carriers is the same.

A base station (BS) configured to receive acknowledgement/negative acknowledgement (ACK/NACK) in a wireless communication system, the BS comprising:

• a radio frequency (RF) unit;
• and
• a processor, wherein the processor
• configures a primary carrier and at least two secondary carriers, and wherein the processor controls the RF unit to:
• transmit at least two physical downlink control channel (PDCCH) signals on the at least two secondary carriers, wherein each of the at least two PDCCH signals on the at least two secondary carriers includes resource allocation information and a transmit power control (TPC) field,
• transmit data as indicated by the resource allocation information in each of the at least two PDCCH signals on the at least two secondary carriers, and
• receive ACK/NACK information for the data via a physical uplink control channel (PUCCH),
• wherein a value of the TPC field in each of the at least two PDCCH signals on the at least two secondary carriers identifies the PUCCH resource as an allocated PUCCH resource for transmitting the ACK/NACK information, and
• wherein the value of the TPC field in each of the at least two PDCCH signals on the at least two secondary carriers is the same.