Method for transmitting an uplink signal, method for receiving an uplink signal, user equipment, and base station

A method for transmitting, by a user equipment configured with a plurality of cells, the plurality of cells comprising a secondary cell (SCell) group comprising one or more SCells and a primary cell (PCell) group comprising at least a PCell, an uplink signal to a base station, the method comprising:

• receiving information indicating a special SCell for addition of the special SCell into the SCell group or designation of the special SCell among the one or more SCells within the SCell group, there being only one special SCell within the SCell group;
• and
• transmitting a first uplink signal comprising at least one of signaling for a random access procedure on the indicated special SCell or designated special SCell, or channel quality information reporting and acknowledgement/non-acknowledgement (ACK/NACK) associated with the one or more SCells within the SCell group, using the indicated special SCell or designated special SCell,
• wherein the special SCell of the SCell group is different from the PCell of the PCell group.

A method for receiving, by a base station, an uplink signal from a user equipment configured with a plurality of cells, the plurality of cells comprising a secondary cell (SCell) group comprising one or more SCells and a primary cell (PCell) group comprising at least a PCell, the method comprising:

• transmitting information to the user equipment, the information indicating a special SCell for addition of the special SCell into the SCell group or designation of the special SCell among the one or more SCells within the SCell group, there being only one special SCell within the SCell group;
• and
• receiving a first uplink signal, comprising at least one of signaling for a random access procedure on the indicated special SCell or designated special SCell, or channel quality information reporting and acknowledgement/non-acknowledgement (ACK/NACK) associated with the one or more SCells within the SCell group, using the indicated special SCell or designated special SCell,
• wherein the special SCell of the SCell group is different from the PCell of the PCell group.

A user equipment, which is configured with a plurality of cells, the plurality of cells comprising a secondary scell (SCell) group comprising one or more SCells and a primary cell (PCell) group comprising at least a PCell, for transmitting an uplink signal to a base station, the user equipment comprising:

• a radio frequency (RF) unit configured to transmit or receive a radio signal;
• and
• a processor configured to control the RF unit to:
• receive information indicating a special SCell for addition of the special SCell into the SCell group or designation of the special SCell among the one or more SCells within the SCell group, there being only one special SCell within the SCell group;
• and
• transmit a first uplink signal comprising at least one of signaling for a random access procedure on the indicated special SCell or designated special SCell, or channel quality information reporting and acknowledgement/non-acknowledgement (ACK/NACK) associated with the one or more SCells within the SCell group, using the indicated special SCell or designated special SCell,
• wherein the special SCell of the SCell group is different from the PCell of the PCell group.

Abase station for receiving an uplink signal from a user equipment, which is configured with a plurality of cells, the plurality of cells comprising a secondary scell (SCell) group comprising one or more SCells and a primary cell (PCell) group comprising at least a PCell, the base station comprising:

• a radio frequency (RF) unit configured to transmit or receive a radio signal;
• and
• a processor configured to control the RF unit to:
• transmit information indicating a special SCell for addition of the special SCell into the SCell group or designation of the special SCell among the one or more SCells within the SCell group, to the user equipment, there being only one special SCell within the SCell group;
• and
• receive a first uplink signal comprising at least one of signaling for a random access procedure on the indicated special SCell or designated special SCell, or channel quality information reporting and acknowledgement/non-acknowledgement (ACK/NACK) associated with the one or more SCells within the SCell group, using the indicated special SCell or designated special SCell,
• wherein the special SCell of the SCell group is different from the PCell of the PCell group.