Method for transmitting control signal using efficient multiplexing

A method for receiving, by a user equipment, acknowledgement/non-acknowledgment (ACK/NACK) information, the method comprising:

• transmitting, by the user equipment, an uplink transmission;
• and
• receiving, by the user equipment, an ACK/NACK group through each of a fixed number of multiple resource sets in a subframe,
• wherein the ACK/NACK group contains multiple ACK/NACKs associated with multiple uplink transmissions including the uplink transmission of the user equipment, using orthogonal codes which distinguish the multiple ACK/NACKs from each other,
• wherein each of the fixed number of multiple resource sets occupies a predetermined number of subcarriers and one orthogonal frequency division multiplexing (OFDM) symbol,
• which the fixed number of multiple resource sets are separate from each other along a frequency axis in the subframe,
• wherein the fixed number of multiple resource sets are distributed within one or multiple OFDM symbols in the subframe,
• wherein the fixed number is larger than two, and
• wherein, when two OFDM symbols are used for the ACK/NACK group in the subframe, the fixed number of multiple resource sets are distributed across the two OFDM symbols alternately along the frequency axis in the subframe.

A base station for transmitting acknowledgement/non-acknowledgment (ACK/NACK) information, the base station comprising:

• a receiver configured to receive multiple uplink transmissions;
• and
• a transmitter configured to transmit an ACK/NACK group through each of a fixed number of multiple resource sets in a subframe,
• wherein the ACK/NACK group contains multiple ACK/NACKs associated with the multiple transmissions, using orthogonal codes which distinguish the multiple ACK/NACKs from each other,
• wherein each of the fixed number of multiple resource sets occupies a predetermined number of subcarriers and one orthogonal frequency division multiplexing (OFDM) symbol,
• which the fixed number of multiple resource sets are separate from each other along a frequency axis in the subframe,
• wherein the fixed number of multiple resource sets are distributed within one or multiple OFDM symbols in the subframe,
• wherein the fixed number is larger than two, and
• wherein, when two OFDM symbols are used for the ACK/NACK group in the subframe, the fixed number of multiple resource sets are distributed across the two OFDM symbols alternately along the frequency axis in the subframe.

A user equipment for receiving acknowledgement/non-acknowledgment (ACK/NACK) information, the user equipment comprising:

• a transmitter configured to transmit an uplink transmission;
• and
• a receiver configured to receive an ACK/NACK group through each of a fixed number of multiple resource sets in a subframe,
• wherein the ACK/NACK group contains multiple ACK/NACKs associated with multiple uplink transmissions including the uplink transmission of the user equipment, using orthogonal codes which distinguish the multiple ACK/NACKs from each other,
• wherein each of the fixed number of multiple resource sets occupies a predetermined number of subcarriers and one orthogonal frequency division multiplexing (OFDM) symbol,
• which the fixed number of multiple resource sets are separate from each other along a frequency axis in the subframe,
• wherein the fixed number of multiple resource sets are distributed within one or multiple OFDM symbols in the subframe,
• wherein the fixed number is larger than two, and
• wherein, when two OFDM symbols are used for the ACK/NACK group in the subframe, the fixed number of multiple resource sets are distributed across the two OFDM symbols alternately along the frequency axis in the subframe.