Apparatus and method for transmitting control channel in wireless communication system

A user equipment (UE) in a wireless communication system, the UE comprising:

• at least one transceiver;
• and
• at least one processor
• configured to:
• receive, from a base station (BS) via a radio resource control (RRC) signalling, configuration information configuring a physical uplink control channel (PUCCH) format associated with a Zadoff-Chu (ZC) sequence;
• acquire information bits for uplink control information;
• acquire a transmission bitstream based on channel coding and scrambling for the information bits;
• generate a transmission complex sequence corresponding to the transmission bitstream, among a plurality of complex sequences;
• and
• transmit, to the BS, a signal of the transmission complex sequence on a PUCCH,
• wherein each of the plurality of complex sequences is based on the ZC sequence, and
• wherein a length of the ZC sequence is larger than a number of candidate values of the transmission bitstream.

A method performed by a base station (BS) in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE) via a radio resource control (RRC) signalling, configuration information configuring a physical uplink control channel (PUCCH) format associated with a Zadoff-Chu (ZC) sequence;
• receiving a signal from a the UE on a PUCCH;
• acquiring a transmission complex sequence of the signal among a plurality of complex sequences;
• and
• acquiring information bits for uplink control information by descrambling and decoding a transmission bitstream corresponding to the transmission complex sequence,
• wherein each of the plurality of complex sequences is based on the ZC sequence, and
• wherein a length of the ZC sequence is larger than a number of candidate values of the transmission bitstream.