Method and apparatus for transmitting/receiving wireless signal in wireless communication system

A communication apparatus for use in a wireless communication system, comprising:

• a memory;
• and
• a processor, the processor being configured to:
• receive downlink scheduling information through a physical downlink control channel (PDCCH), the downlink scheduling information comprising resource indication information (RI);
• select a first physical uplink control channel (PUCCH) resource set from among a plurality of PUCCH resource sets based on a size of the control information;
• and
• transmit the control information using a PUCCH resource corresponding to the RI in the first PUCCH resource set,
• wherein, when a control information size supported by the first PUCCH resource set is less than or equal to X (>=1) bits, the PUCCH resource is determined using one of a first scheme and a second scheme, and
• wherein, when the control information size supported by the first PUCCH resource set is greater than X bits, the PUCCH resource is determined using only the second scheme:
• the first scheme:
• a pair of (the RI, an index of a resource used for reception of the PDCCH) one-to-one corresponds to the PUCCH resource in the first PUCCH resource set;
• and
• the second scheme:
• the RI one-to-one corresponds to the PUCCH resource in the first PUCCH resource set.

A method for receiving control information by a communication apparatus in a wireless communication system, the method comprising:

• transmitting downlink scheduling information on a physical downlink control channel (PDCCH), the downlink scheduling information comprising resource indication information (RI);
• selecting a first physical uplink control channel (PUCCH) resource set from among a plurality of PUCCH resource sets based on a size of the control information;
• and
• receiving the control information using a PUCCH resource corresponding to the RI in the first PUCCH resource set,
• wherein, when a control information size supported by the first PUCCH resource set is less than or equal to X (>=1) bits, the PUCCH resource is determined using one of a first scheme and a second scheme, and
• wherein, when the control information size supported by the first PUCCH resource set is greater than X bits, the PUCCH resource is determined using only the second scheme:
• the first scheme:
• a pair of (the RI, an index of a resource used for reception of the PDCCH) one-to-one corresponds to the PUCCH resource in the first PUCCH resource set;
• and
• the second scheme:
• the RI one-to-one corresponds to the PUCCH resource in the first PUCCH resource set.

A communication apparatus for use in a wireless communication system, comprising:

• a memory;
• and
• a processor, the processor being configured to:
• transmit downlink scheduling information on a physical downlink control channel (PDCCH), the downlink scheduling information comprising resource indication information (RI);
• select a first physical uplink control channel (PUCCH) resource set from among a plurality of PUCCH resource sets based on a size of the control information;
• and
• receive the control information using a PUCCH resource corresponding to the RI in the first PUCCH resource set,
• wherein, when a control information size supported by the first PUCCH resource set is less than or equal to X (>=1) bits, the PUCCH resource is determined using one of a first scheme and a second scheme, and
• wherein, when the control information size supported by the first PUCCH resource set is greater than X bits, the PUCCH resource is determined using only the second scheme:
• the first scheme:
• a pair of (the RI, an index of a resource used for reception of the PDCCH) one-to-one corresponds to the PUCCH resource in the first PUCCH resource set;
• and
• the second scheme:
• the RI one-to-one corresponds to the PUCCH resource in the first PUCCH resource set.