Method and user device for receiving downlink signal, and method and base station for transmitting downlink signal

A user equipment for transmitting uplink control information, the user equipment comprising:

• a radio frequency (RF) unit, and
• a processor that:
• controls the RF unit to receive at least one physical downlink control channel (PDCCH) for a first cell group of the user equipment, wherein the first cell group comprises a primary cell (Pcell) and one or more secondary cells (Scells) among multiple cells with which the user equipment is configured;
• generates first acknowledgement (ACK)/negative acknowledgement (NACK) information for the first cell group;
• and
• controls the RF unit to transmit a first physical uplink control channel (PUCCH) carrying the first ACK/NACK information through the Pcell when the RF unit receives a Pcell physical downlink control channel (PDCCH) only, and through a first Scell configured for ACK/NACK transmission of the first cell group among the one or more Scells of the first cell group when the RF unit receives at least one Scell PDCCH,
• wherein the Pcell PDCCH carries scheduling information for a primary cell (Pcell), and the at least one Scell PDCCH carries scheduling information for a Scell included in the first cell group, and
• wherein the first PUCCH is transmitted using a timing advance value of the Pcell when the user equipment transmits the first PUCCH through the first Pcell and the first PUCCH is transmitted using a timing advance value of the first Scell when the user equipment transmits the first PUCCH through the first Scell.

A method for receiving uplink control information by a base station, the method comprising:

• transmitting, by the base station, at least one physical downlink control channel (PDCCH) for a first cell group of a user equipment, wherein the first cell group comprises a primary cell (Pcell) and one or more secondary cells (Scells) among the multiple cells with which the user equipment is configured, and
• receiving, by the base station, a first physical uplink control channel (PUCCH) carrying first ACK/NACK information for the first cell group through the Pcell when the base station transmits a Pcell physical downlink control channel (PDCCH) only, and through a first Scell configured for ACK/NACK reception of the first cell group among the one or more Scells of the first cell group when the base station transmits at least one Scell PDCCH,
• wherein the Pcell PDCCH carries scheduling information for a primary cell (Pcell), and the at least one Scell PDCCH carries scheduling information for a Scell included in the first cell group, and
• wherein the first PUCCH is received using a timing advance value of the Pcell when the base station receives the first PUCCH through the first Pcell and the first PUCCH is received using a timing advance value of the first Scell when the base station receives the first PUCCH through the first Scell.

A base station for receiving uplink control information, the base station comprising:

• a radio frequency (RF) unit;
• and
• a processor that:
• controls the RF unit to transmit at least one physical downlink control channel (PDCCH) for a first cell group of a user equipment, wherein the first cell group comprises a primary cell (Pcell) and one or more secondary cells (Scells) among the multiple cells with which the user equipment is configured;
• and
• controls the RF unit to receive a first physical uplink control channel (PUCCH) carrying first ACK/NACK information for the first cell group through the Pcell when the base station transmits a Pcell physical downlink control channel (PDCCH) only, and through a first Scell configured for ACK/NACK reception of the first cell group among the one or more Scells of the first cell group when the base station transmits at least one Scell PDCCH,
• wherein the Pcell PDCCH carries scheduling information for a primary cell (Pcell), and the at least one Scell PDCCH carries scheduling information for a Scell included in the first cell group, and
• wherein the first PUCCH is received using a timing advance value of the Pcell when the base station receives the first PUCCH through the first Pcell and the first PUCCH is received using a timing advance value of the first Scell when the base station receives the first PUCCH through the first Scell.