Random access channel procedure involving plurality of random access channel preambles, in wireless communication system, and device supporting same

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

receiving information related to physical uplink shared channel (PUSCH) configuration for a message A related to a random access procedure;

transmitting the message A; and

receiving a message B related to the random access procedure in response to the message A,

wherein a physical random access channel (PRACH) preamble among one or more PRACH preambles for the random access procedure is included in the message A,

wherein the one or more PRACH preambles comprise at least one of at least one first PRACH preamble and at least one second PRACH preamble,

wherein the at least one first PRACH preamble is mapped to at least one valid PUSCH occasion among a plurality of valid PUSCH occasions; and

wherein the at least one second PRACH preamble is not mapped to any of the plurality of valid PUSCH occasions, and

wherein based on the message A including a PRACH preamble among the at least one first PRACH preamble, the message A comprises a PUSCH,

wherein a PRACH preamble among the at least one second PRACH preamble is available to be transmitted,

wherein the PUSCH is transmitted based on the PUSCH configuration, and

wherein based on information related to a demodulation reference signal (DM-RS) code division multiplexing (CDM) group of the PUSCH configuration, at least one DM-RS CDM group for the PUSCH is configured among two preconfigured groups.

2. The method of claim 1 ,

wherein based on the PUSCH configuration comprising the information related to the DM-RS CDM group, the information related to the DM-RS CDM group indicates which one is used for the at least one DM-RS CDM group for the PUSCH among the two preconfigured groups, and

wherein based on to the PUSCH configuration not comprising the information related to the DM-RS CDM group, the at least one DM-RS CDM group for the PUSCH is configured as the two predetermined groups.

3. The method of claim 1 , wherein a number of ports for the DMRS DM RS is determined in a set of {1, 2, 4}.

4. The method of claim 1 ,

wherein the PUSCH is unable to be transmitted in any of remaining valid PUSCH occasions among the plurality of valid PUSCH occasions except for the at least one valid PUSCH occasion, and

wherein the remaining valid PUSCH occasions are unmapped to any of the plurality of PRACH preambles.

5. An apparatus configured to operate in a wireless communication system, the apparatus comprising:

a memory; and

at least one processor coupled with the memory,

wherein the at least one processor is configured to:

receive information related to physical uplink shared channel (PUSCH) configuration for a message A related to a random access procedure;

transmit the message A; and

receive a message B related to the random access procedure in response to the message A,

wherein a physical random access channel (PRACH) preamble among one or more PRACH preambles for the random access procedure is included in the message A,

wherein the one or more PRACH preambles comprise at least one of at least one first PRACH preamble and at least one second PRACH preamble,

wherein the at least one first PRACH preamble which is mapped to at least one valid PUSCH occasion among a plurality of valid PUSCH occasions; and

wherein the at least one second PRACH preamble which is not mapped to any of the plurality of valid PUSCH occasions, and

wherein based on the message A including a PRACH preamble among the at least one first PRACH preamble, the message A comprises a PUSCH,

wherein a PRACH preamble among the at least one second PRACH preamble is available to be transmitted,

wherein the PUSCH is transmitted based on the PUSCH configuration, and

wherein based on information related to a demodulation reference signal (DM-RS) code division multiplexing (CDM) group of the PUSCH configuration, at least one DM-RS CDM group for the PUSCH is configured among two preconfigured groups.

6. The apparatus of claim 5 , wherein a number of ports for the DMRS DM RS is determined in a set of {1, 2, 4}.

7. The apparatus of claim 5 , wherein the apparatus communicates with at least one of a mobile terminal, a network, or an autonomous driving vehicle other than a vehicle including the apparatus.

8. The apparatus of claim 5 ,

wherein based on the PUSCH configuration comprising the information related to the DM-RS CDM group, the information related to the DM-RS CDM group indicates which one is used for the at least one DM-RS CDM group for the PUSCH among the two preconfigured groups, and

wherein based on the PUSCH configuration not comprising the information related to the DM-RS CDM group, the at least one DM-RS CDM group for the PUSCH is configured as the two predetermined groups.

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

transmitting information related to physical uplink shared channel (PUSCH) configuration for a message A related to a random access procedure;

receiving the message A; and

transmitting a message B related to the random access procedure in response to the message A,

wherein a physical random access channel (PRACH) preamble among one or more PRACH preambles for the random access procedure is included in the message A,

wherein the one or more PRACH preambles comprise at least one of at least one first PRACH preamble and at least one second PRACH preamble,

wherein the at least one first PRACH preamble which is mapped to at least one valid PUSCH occasion among a plurality of valid PUSCH occasions; and

wherein the at least one second PRACH preamble which is not mapped unmapped to any of the plurality of valid PUSCH occasions, and

wherein based on the message A including a PRACH preamble among the at least one first PRACH preamble, the message A comprises a PUSCH,

wherein a PRACH preamble among the at least one second PRACH preamble is available to be received,

wherein the PUSCH is received based on the PUSCH configuration, and

wherein based on information related to a demodulation reference signal (DM-RS) code division multiplexing (CDM) group of the PUSCH configuration, at least one DM-RS CDM group for the PUSCH is configured among two preconfigured groups.

10. An apparatus configured to operate in a wireless communication system, the apparatus comprising:

a memory; and

at least one processor coupled with the memory,

wherein the at least one processor is configured to:

transmit information related to physical uplink shared channel (PUSCH) configuration for a message A related to a random access procedure, receive the message A; and

transmit a message B related to the random access procedure in response to the message A,

wherein a physical random access channel (PRACH) preamble among one or more PRACH preambles for the random access procedure is included in the message A,

wherein the plurality of PRACH preambles comprise at least one of at least one first PRACH preamble and at least one second PRACH preamble,

wherein the at least one first PRACH preamble which is mapped to at least one valid PUSCH occasion among a plurality of valid PUSCH occasions; and

wherein the at least one second PRACH preamble which is not mapped to any of the plurality of valid PUSCH occasions, and

wherein based on the message A including a PRACH preamble among the at least one first PRACH preamble, the message A comprises a PUSCH,

wherein a PRACH preamble among the at least one second PRACH preamble is available to be received,

wherein the PUSCH is received based on the PUSCH configuration, and

wherein based on information related to a demodulation reference signal (DM-RS) code division multiplexing (CDM) group of the PUSCH configuration, at least one DM-RS CDM group for the PUSCH is configured among two preconfigured groups.