Method for transmitting demodulation reference signal for uplink control signal in wireless communication system and device therefor

1. A method of transmitting a demodulation reference signal for physical uplink control channel (PUCCH) in a wireless communication system, the method performed by a terminal and comprising:

receiving, from a base station, configuration information related to a uplink transform precoding;

based on the uplink transform precoding being configured:

generating a sequence used for the demodulation reference signal for the PUCCH based on a low peak to average power ratio (PAPR) sequence; and

transmitting, to the base station, the demodulation reference signal for the PUCCH based on the sequence used for the demodulation reference signal for the PUCCH,

wherein based on a length of the low PAPR sequence being 6, the low PAPR sequence is generated based on a base sequence based on one of at least one length-6 sequence determined based on e jφ(i)π/8 ,

wherein the i is an index of elements of each of the at least one length-6 sequence and from 0 to 5, and

wherein a set of values of (φ(0), φ(1), φ(2), φ(3), φ(4), φ(5)) includes i) (−7, −5, −1, −7, −5, 5), ii) (−7, 1, −3, 1, 5, 1), iii) (−7, 1, −3, 3, 7, 5), and iv) (−7, 3, 1, 5, −1, 3).

2. The method of claim 1 , wherein the set of the values of (φ(0), φ(1), φ(2), φ(3), φ(4), φ(5)) further includes (−1, −7, −3, −5, −1, 3), (−7, 3, −7, 5, −7, −3) and (5, −7, 7, 1, 5, 1).

3. The method of claim 2 , wherein a number of values included in the set of the values of (φ(0), φ(1), φ(2), φ(3), φ(4), φ(5)) is 30.

4. The method of claim 2 , wherein a cyclic shifted sequence for the φ(i) is the same sequence as the φ(i).

5. The method of claim 1 , wherein a value of auto-correlation for the low PAPR sequence is less than a specific value.

6. The method of claim 1 ,

wherein the configuration information is received via RRC signaling.

7. The method of claim 1 ,

wherein a Frequency Domain Spectrum Shaping (FDSS) filter is not applied to the low PAPR sequence.

8. The method of claim 1 , wherein the low PAPR sequence is subject to Frequency Division Multiplexing (FDM) with two antenna ports in a Comb-2 form.

9. The method of claim 8 , wherein different PAPR sequences are used for the two antenna ports, respectively.

10. The method of claim 1 , wherein the at least one length-6 sequence has an 8-phase shift keying (PSK) symbol as an element.

11. A terminal for transmitting a demodulation reference signal for an uplink control signal in a wireless communication system, the terminal comprising:

a transceiver transceiving a radio signal; and

a processor functionally connected to the transceiver,

wherein the processor is configured to control the terminal to:

receive, from a base station, configuration information related to a uplink transform precoding;

based on the uplink transform precoding being configured:

generate a sequence used for the demodulation reference signal for a physical uplink control channel (PUCCH) based on a low peak to average power ratio (PAPR) sequence; and

transmit, to the base station, the demodulation reference signal for the PUCCH based on the sequence used for the demodulation reference signal for the PUCCH,

wherein based on a length of the low PAPR sequence being 6, the low PAPR sequence is generated based on a base sequence based on one of at least one length-6 sequence determined based on e jφ(i)π/8 ,

wherein the i is an index of elements of each of the at least one length-6 sequence and from 0 to 5, and

wherein a set of values of (φ(0), (φ(1), φ (2), φ (3), φ (4), φ(5)) includes i) (−7, −5, −1, −7, −5, 5), ii) (−7, 1, −3, 1, 5, 1), iii) (−7, 1, −3, 3, 7, 5), and iv) (−7, 3, 1, 5, −1, 3).

12. An apparatus comprising:

one or more memories; and

one or more processors functionally connected to the one or more memories,

wherein the one or more processors control the apparatus to:

receive, from a base station, configuration information related to a uplink transform precoding;

based on the uplink transform precoding being configured:

generate a sequence used for a demodulation reference signal for a physical uplink control channel (PUCCH) based on a low peak to average power ratio (PAPR) sequence; and

transmit, to the base station, the demodulation reference signal for the PUCCH based on the sequence used for the demodulation reference signal for the PUCCH,

wherein based on a length of the low PAPR sequence being 6, the low PAPR sequence is generated based on a base sequence based on one of at least one length-6 sequence determined based on e jφ(i)π/8 ,

wherein the i is an index of elements of each of the at least one length-6 sequence and from 0 to 5, and

wherein a set of values of (φ(0), φ(1), φ(2), φ(3), φ(4), φ(5)) includes i) (−7, −5, −1, −7, −5, 5), ii) (−7, 1, −3, 1, 5, 1), iii) (−7, 1, −3, 3, 7, 5), and iv) (−7, 3, 1, 5, −1, 3).