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:

identifying that a transform precoding is enabled based on first information received from a base station;

identifying whether to enable pi/2 binary phase shift keying (BPSK) modulation with the transform precoding based on second information received from the base station;

identifying whether a first demodulation reference signal (DMRS) is used for a physical uplink control channel (PUSCH) with the pi/2 BPSK modulation based on the second information and third information received from the base station; and

transmitting, to the base station, the first DMRS for the PUSCH using a first sequence generated based on the first information, the second information, and the third information,

wherein the first sequence is generated, in case that the transform precoding is enabled, 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.

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 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 compared to the second sequence.

5. The method of claim 1 , wherein the first information, the second information, and the third information are received via at least one radio resource control (RRC) message.

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:

identify that a transform precoding is enabled based on first information received from a base station,

identify whether to enable pi/2 binary phase shift keying (BPSK) modulation with the transform precoding based on second information received from the base station,

identify whether a first demodulation reference signal (DMRS) is used for a physical uplink control channel (PUSCH) with the pi/2 BPSK modulation based on the second information and third information received from the base station, and

transmit, to the base station, the first DMRS for the PUSCH using a first sequence generated based on the first information, the second information, and the third information, and

wherein the first sequence is generated, in case that the transform precoding is enabled, 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.

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 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 compared to the second sequence.

10. The terminal of claim 6 , wherein the first information, the second information, and the third information are received via at least one radio resource control (RRC) message.

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

transmitting, to a terminal, first information indicating that a transform precoding is enabled;

transmitting, to the terminal, second information indicating whether to enable pi/2 binary phase shift keying (BPSK) modulation with the transform precoding;

transmitting, to the terminal, third information indicating whether a first demodulation reference signal (DMRS) is used for a physical uplink control channel (PUSCH) with the pi/2 BPSK modulation; and

receiving the first DMRS for the PUSCH using a first sequence generated based on the first information, the second information, and the third information,

wherein the first sequence is generated, in case that the transform precoding is enabled, 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 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 compared to the second sequence.

15. The method of claim 11 , wherein the first information, the second information, and the third information are transmitted via at least one radio resource control (RRC) message.

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, to a terminal, that a transform precoding is enabled,

transmit, to the terminal, whether to enable pi/2 binary phase shift keying (BPSK) modulation with the transform precoding,

transmit, to the terminal, third information indicating whether a first demodulation reference signal (DMRS) is used for a physical uplink control channel (PUSCH) with the pi/2 BPSK modulation, and

receive the first DMRS for the PUSCH using a first sequence generated based on the first information, the second information, and the third information, and

wherein the first sequence is generated, in case that the transform precoding is enabled, 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 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 compared to the second sequence.

20. The base station of claim 16 , wherein the first information, the second information, and the third information are transmitted via at least one radio resource control (RRC) message.