Method and device for transmitting random access signal, and computer readable medium

1. A method for 2-step random access (RA) performed by a terminal in a communication system, the method comprising:

receiving, from a base station, a first random access channel (RACH) configuration for 4-step RA, a second RACH configuration for the 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA;

in case that a type of a random access is the 2 -step RA, identifying an RA occasion for the 2-step RA, wherein, in case that an index indicating a subset of the RA occasions for the 4-step RA shared with the 2-step RA is configured, the RA occasion for the 2-step RA is associated with the subset of the RA occasions for the 4-step RA, and wherein, in case that the index indicating the subset of the RA occasions for the 4-step RA shared with the 2-step RA is not configured, the RA occasion for the 2-step RA is associated with all of the RA occasions for the 4-step RA; and

transmitting, to the base station, a random access preamble in the RA occasion for the 2-step RA.

2. The method of claim 1 ,

wherein, in case that information on the RA occasion for the 2-step RA is not included in the second RACH configuration for the 2-step RA, the RA occasions for the 4-step RA are shared with the 2-step RA.

3. The method of claim 1 , wherein the transmitting comprises:

identifying a PUSCH resource based on the PUSCH configuration, the PUSCH resource being not overlapped with the RA occasion for the 2-step RA;

in case that the random access preamble in the RA occasion for the 2-step RA is mapped to the PUSCH resource, transmitting, to the base station, the random access preamble in the RA occasion for the 2-step RA and the PUSCH in a PUSCH resource; and

in case that the random access preamble in the RA occasion for the 2-step RA is not mapped to the PUSCH resource, transmitting, to the base station, the random access preamble in the RA occasion for the 2-step RA and skipping transmitting the PUSCH.

4. The method of claim 1 ,

wherein the type of the random access is the 2-step RA in case that a reference signal received power (RSRP) measured by the terminal is higher than a threshold configured by the base station, and

wherein the information on the RA occasions for the 4-step RA includes at least one of a physical RACH (PRACH) configuration index and information on frequency resources for the 4-step RA.

5. The method of claim 1 , wherein a value 0 of the index indicates all of the RA occasions for the 4-step RA, wherein a value 1 of the index indicates an RA occasion index 1 for the 4-step RA, wherein a value 2 of the index indicates an RA occasion index 2 for the 4-step RA. wherein a value 3 of the index indicates an RA occasion index 3 for the 4-step RA, wherein a value 4 of the index indicates an RA occasion index 4 for the 4-step RA, wherein a value 5 of the index indicates an RA occasion index 5 for the 4-step RA, wherein a value 6 of the index indicates an RA occasion index 6 for the 4-step RA, wherein a value 7 of the index indicates an RA occasion index 7 for the 4-step RA, and wherein a value 8 of the index indicates an RA occasion index 8 for the 4-step RA.

6. A method for 2-step random access (RA) performed by a base station in a communication system, the method comprising:

transmitting, to a terminal, a first random access channel (RACH) configuration for 4-step RA, a second RACH configuration for the 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA; and

in case that a type of a random access is the 2-step RA, receiving, from the terminal, a random access preamble in an RA occasion for the 2-step RA,

wherein, in case that an index indicating a subset of the RA occasions for the 4-step RA shared with the 2-step RA is configured, the RA occasion for the 2-step RA is associated with the subset of the RA occasions for the 4-step RA, and

wherein, in case that the index indicating the subset of the RA occasions for the 4 -step RA shared with the 2 -step RA is not configured, the RA occasion for the 2-step RA is associated with all of the RA occasions for the 4-step RA.

7. The method of claim 5 ,

wherein, in case that information on the RA occasion for the 2-step RA is not included in the second RACH configuration for the 2-step RA, the RA occasions for the 4-step RA are shared with the 2-step RA.

8. The method of claim 5 , wherein the receiving comprises:

in case that the random access preamble in the RA occasion for the 2-step RA is mapped to a PUSCH resource not overlapped with the RA occasion for the 2-step RA, receiving, from the terminal, the random access preamble in the RA occasion for the 2-step RA and a PUSCH in the PUSCH resource; and

in case that the random access preamble in the RA occasion for the 2-step RA is not mapped to the PUSCH resource, receiving, from the terminal, the random access preamble in the RA occasion for the 2-step RA and skipping receiving the PUSCH.

9. The method of claim 5 ,

wherein the type of the random access the 2-step RA in case that a reference signal received power (RSRP) measured by the terminal is higher than a threshold configured by the base station, and

wherein the information on the RA occasions for the 4-step RA includes at least one of a physical RACH (PRACH) configuration index and information on frequency resources for the 4-step RA.

10. The method of claim 6 , wherein a value 0 of the index indicates all of the RA occasions for the 4-step RA, wherein a value 1 of the index indicates an RA occasion index 1 for the 4-step RA, wherein a value 2 of the index indicates an RA occasion index 2 for the 4-step RA, wherein a value 3 of the index indicates an RA occasion index 3 for the 4-step RA, wherein a value 4 of the index indicates an RA occasion index 4 for the 4-step RA, wherein a value 5 of the index indicates an RA occasion index 5 for the 4-step RA, wherein a value 6 of the index indicates an RA occasion index 6 for the 4-step RA, wherein a value 7 of the index indicates an RA occasion index 7 for the 4-step RA, and wherein a value 8 of the index indicates an RA occasion index 8 for the 4-step RA.

11. A terminal in a communication system, the terminal comprising:

a transceiver; and

a processor coupled with the transceiver and configured to:

receive, from a base station, a first random access channel (RACH) configuration for 4-step random access (RA), a second RACH configuration for 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA,

in case that a type of a random access is the 2-step RA, identify an RA occasion for the 2-step RA, wherein, in case that an index indicating a subset of the RA occasions for the 4-step RA shared with the 2-step RA is configured, the RA occasion for the 2-step RA is associated with the subset of the RA occasions for the 4-step RA, and wherein, in case that the index indicating the subset of the RA occasions for the 4-step RA shared with the 2-step RA is not configured, the RA occasion for the 2-step RA is associated with all of the RA occasions for the 4-step RA, and

transmit, to the base station, a random access preamble in the RA occasion for the 2-step RA.

12. The terminal of claim 9 ,

wherein, in case that information on the RA occasion for the 2-step RA is not included in the second RACH configuration for the 2-step RA, the RA occasions for the 4-step RA are shared with the 2-step RA.

13. The terminal of claim 9 , wherein the processor is configured to:

identify a PUSCH resource based on the PUSCH configuration, the PUSCH resource being not overlapped with the RA occasion for the 2-step RA,

in case that the random access preamble in the RA occasion for the 2-step RA is mapped to the PUSCH resource, transmit, to the base station, the random access preamble in the RA occasion for the 2-step RA and a PUSCH in the PUSCH resource, and

in case that the random access preamble in the RA occasion for the 2-step RA is not mapped to the PUSCH resource, transmit, to the base station, the random access preamble in the RA occasion for the 2-step RA and skip transmitting the PUSCH.

14. The terminal of claim 9 ,

wherein the type of the random access is the 2-step RA in case that a reference signal received power (RSRP) measured by the terminal is higher than a threshold configured by the base station, and

wherein the information on the RA occasions for the 4-step RA includes at least one of a physical RACH (PRACH) configuration index and information on frequency resources for the 4-step RA.

15. The terminal of claim 11 , wherein a value 0 of the index indicates all of the RA occasions for the 4-step RA, wherein a value 1 of the index indicates an RA occasion index 1 for the 4-step RA, wherein a value 2 of the index indicates an RA occasion index 2 for the 4-step RA, wherein a value 3 of the index indicates an RA occasion index 3 for the 4-step RA, wherein a value 4 of the index indicates an RA occasion index 4 for the 4-step RA, wherein a value 5 of the index indicates an RA occasion index 5 for the 4-step RA, wherein a value 6 of the index indicates an RA occasion index 6 for the 4-step RA, wherein a value 7 of the index indicates an RA occasion index 7 for the 4-step RA, and wherein a value 8 of the index indicates an RA occasion index 8 for the 4-step RA.

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

a transceiver; and

a processor coupled with the transceiver and configured to:

transmit, to a terminal, a first random access channel (RACH) configuration for 4-step random access (RA), a second RACH configuration for 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA, and

in case that a type of a random access is the 2-step RA, receive, from the terminal, a random access preamble in an RA occasion for the 2-step RA,

wherein, in case that an index indicating a subset of the RA occasions for the 4-step RA shared with the 2-step RA is configured, the RA occasion for the 2-step RA is associated with the subset of the RA occasions for the 4-step RA, and

wherein, in case that the index indicating the subset of the RA occasions for the 4 -step RA shared with the 2 -step RA is not configured, the RA occasion for the 2-step RA is associated with all of the RA occasions for the 4-step RA.

17. The base station of claim 13 ,

wherein, in case that information on the RA occasion for the 2-step RA is not included in the second RACH configuration for the 2-step RA, the RA occasions for the 4-step RA are shared with the 2-step RA.

18. The base station of claim 13 ,

wherein the type of the random access is the 2-step RA in case that a reference signal received power (RSRP) measured by the terminal is higher than a threshold configured by the base station, and

wherein the information on the RA occasions for the 4-step RA includes at least one of a physical RACH (PRACH) configuration index and information on frequency resources for the 4-step RA.

19. The base station of claim 13 , wherein the processor is configured to:

in case that the random access preamble in the RA occasion for the 2-step RA is mapped to a PUSCH resource not overlapped with the RA occasion for the 2-step RA, receive, from the terminal, the random access preamble in the RA occasion for the 2-step RA and a PUSCH in the PUSCH resource, and

in case that the random access preamble in the RA occasion for the 2-step RA is not mapped to the PUSCH resource, receive, from the terminal, the random access preamble in the RA occasion for the 2-step RA and skip receiving the PUSCH.

20. The base station of claim 16 , wherein a value 0 of the index indicates all of the RA occasions for the 4-step RA, wherein a value 1 of the index indicates an RA occasion index 1 for the 4-step RA, wherein a value 2 of the index indicates an RA occasion index 2 for the 4-step RA, wherein a value 3 of the index indicates an RA occasion index 3 for the 4-step RA, wherein a value 4 of the index indicates an RA occasion index 4 for the 4-step RA, wherein a value 5 of the index indicates an RA occasion index 5 for the 4-step RA, wherein a value 6 of the index indicates an RA occasion index 6 for the 4-step RA, wherein a value 7 of the index indicates an RA occasion index 7 for the 4-step RA, and wherein a value 8 of the index indicates an RA occasion index 8 for the 4-step RA.