Method and apparatus for transmitting and receiving uplink reference signal in wireless communication systems

1. A method performed by a terminal in a wireless communication system, the method comprising:

receiving, from a base station, first information through a system information block (SIB) or a higher layer signaling, the first information indicating that a transform precoding is enabled;

receiving, from the base station, second information and third information through the higher layer signaling, the second information indicating that a pi/2 binary phase shift keying (BPSK) modulation is used for a physical uplink shared channel (PUSCH), and the third information indicating that a first demodulation reference signal (DMRS) is used for the PUSCH with the pi/2 BPSK modulation;

identifying that the transform precoding is enabled for the PUSCH based on the first information;

generating a first sequence, in case that the transform precoding is enabled for the PUSCH, the pi/2 BPSK modulation is used for the PUSCH, and the first DMRS is used for the PUSCH with the pi/2 BPSK modulation; and

transmitting, to the base station, the first DMRS for the PUSCH using the first sequence.

2. The method of claim 1 , wherein the first sequence is used for a second DMRS associated with a physical uplink control channel (PUCCH), in case that the transform precoding is enabled, and the pi/2 BPSK modulation is used for the PUCCH.

3. The method of claim 2 ,

wherein a second sequence is used for the PUSCH, in case that the transform precoding is disabled, the pi/2 BPSK modulation is not used for the PUSCH, or the first DMRS is not used for the PUSCH with the pi/2 BPSK modulation, and

wherein the second sequence is used for the PUCCH, in case that the transform precoding is disabled, or the pi/2 BPSK modulation is not used for the PUCCH.

4. The method of claim 3 , wherein the first sequence is associated with low peak to average power ratio as compared to the second sequence.

5. The method of claim 1 , wherein the PUSCH is not scheduled using DCI format 0_0.

6. A terminal in a wireless communication system, the terminal comprising:

a transceiver; and

at least one processor coupled with the transceiver,

wherein the at least one processor is configured to:

receive, from a base station, first information through a system information block (SIB) or a higher layer signaling, the first information indicating that a transform precoding is enabled,

receive, from the base station, second information and third information through the higher layer signaling, the second information indicating that a pi/2 binary phase shift keying (BPSK) modulation is used for a physical uplink shared channel (PUSCH), and the third information indicating that a first demodulation reference signal (DMRS) is used for the PUSCH with the pi/2 BPSK modulation,

identify that the transform precoding is enabled for the PUSCH based on the first information,

generate a first sequence, in case that the transform precoding is enabled for the PUSCH, the pi/2 BPSK modulation is used for the PUSCH, and the first DMRS is used for the PUSCH with the pi/2 BPSK modulation, and

transmit, to the base station, the first DMRS for the PUSCH using the first sequence.

7. The terminal of claim 6 , wherein the first sequence is used for a second DMRS associated with a physical uplink control channel (PUCCH), in case that the transform precoding is enabled, and the pi/2 BPSK modulation is used for the PUCCH.

8. The terminal of claim 7 ,

wherein a second sequence is used for the PUSCH, in case that the transform precoding is disabled, the pi/2 BPSK modulation is not used for the PUSCH, or the first DMRS is not used for the PUSCH with the pi/2 BPSK modulation, and

wherein the second sequence is used for the PUCCH, in case that the transform precoding is disabled, or the pi/2 BPSK modulation is not used for the PUCCH.

9. The terminal of claim 8 , wherein the first sequence is associated with low peak to average power ratio as compared to the second sequence.

10. The terminal of claim 6 , wherein the PUSCH is not scheduled using DCI format 0_0.

11. A method performed by a base station in a wireless communication system, the method comprising:

transmitting first information through a system information block (SIB) or a higher layer signaling, the first information indicating that a transform precoding is enabled;

transmitting, to a user equipment (UE), second information and third information through the higher layer signaling, the second information indicating that a pi/2 binary phase shift keying (BPSK) modulation is used for a physical uplink shared channel (PUSCH), and the third information indicating that a first demodulation reference signal (DMRS) is used for the PUSCH with the pi/2 BPSK modulation; and

receiving, from the UE, the first DMRS for the PUSCH using a first sequence,

wherein the first sequence is generated, in case that the transform precoding is enabled for the PUSCH, the pi/2 BPSK modulation is used for the PUSCH, and the first DMRS is used for the PUSCH with the pi/2 BPSK modulation.

12. The method of claim 11 , wherein the first sequence is used for a second DMRS associated with a physical uplink control channel (PUCCH), in case that the transform precoding is enabled, and the pi/2 BPSK modulation is used for the PUCCH.

13. The method of claim 12 ,

wherein a second sequence is used for the PUSCH, in case that the transform precoding is disabled, the pi/2 BPSK modulation is not used for the PUSCH, or the first DMRS is not used for the PUSCH with the pi/2 BPSK modulation, and

wherein the second sequence is used for the PUCCH, in case that the transform precoding is disabled, or the pi/2 BPSK modulation is not used for the PUCCH.

14. The method of claim 13 , wherein the first sequence is associated with low peak to average power ratio as compared to the second sequence.

15. The method of claim 11 , wherein the PUSCH is not scheduled using DCI format 0_0.

16. A base station in a wireless communication system, the base station comprising:

a transceiver; and

at least one processor coupled with the transceiver,

wherein the at least one processor is configured to:

transmit first information through a system information block (SIB) or a higher layer signaling, the first information indicating that a transform precoding is enabled,

transmit, to a user equipment (UE), second information and third information through the higher layer signaling, the second information indicating that a pi/2 binary phase shift keying (BPSK) modulation is used for a physical uplink shared channel (PUSCH), and the third information indicating that a first demodulation reference signal (DMRS) is used for the PUSCH with the pi/2 BPSK modulation,

receive, from the UE, the first DMRS for the PUSCH using a first sequence,

wherein the first sequence is generated, in case that the transform precoding is enabled for the PUSCH, the pi/2 BPSK modulation is used for the PUSCH, and the first DMRS is used for the PUSCH with the pi/2 BPSK modulation.

17. The base station of claim 16 , wherein the first sequence is used for a second DMRS associated with a physical uplink control channel (PUCCH), in case that the transform precoding is enabled, and the pi/2 BPSK modulation is used for the PUCCH.

18. The base station of claim 17 ,

wherein a second sequence is used for the PUSCH, in case that the transform precoding is disabled, the pi/2 BPSK modulation is not used for the PUSCH, or the first DMRS is not used for the PUSCH with the pi/2 BPSK modulation, and

wherein the second sequence is used for the PUCCH, in case that the transform precoding is disabled, or the pi/2 BPSK modulation is not used for the PUCCH.

19. The base station of claim 18 , wherein the first sequence is associated with low peak to average power ratio as compared to the second sequence.

20. The base station of claim 15 , wherein the PUSCH is not scheduled using DCI format 0_0.