Method for transmitting and receiving signal in wireless communication system, and apparatus for supporting same

A user equipment (UE) configured to perform a 2-step random access procedure in a wireless communication system, the UE comprising:

• a transceiver;
• and
• at least one processor coupled to the transceiver,
• wherein the at least one processor is configured to:
• receive configuration information related to a message A related to the 2-step random access procedure, wherein the message A comprises a physical random access channel (PRACH) preamble, a physical uplink shared channel (PUSCH), and a demodulation reference signal (DMRS) for the PUSCH;
• transmit the message A;
• and
• receive a message B related to the 2-step random access procedure in response to the message A,
• wherein the PUSCH is obtained based on a scrambling sequence related to a random access preamble identifier (RAPID) of the PRACH preamble,
• wherein the PUSCH is transmitted in at least one PUSCH occasion among consecutive PUSCH occasions in a frequency domain and a time domain,
• wherein the consecutive PUSCH occasions are obtained based on the configuration information,
• wherein the configuration information comprises information regarding a number of physical resource blocks (PRBs) for the consecutive PUSCH occasions,
• wherein the PRACH preamble is obtained among at least one preconfigured PRACH preamble,
• wherein the DMRS is related to (i) at least one DMRS port and (ii) at least one DMRS sequence, and
• wherein the at least one preconfigured PRACH preamble is mapped to (i) the at least one DMRS port and then (ii) the at least one DMRS sequence based on (i) an index of each of the at least one DMRS port being considered in ascending order and then (ii) an index of each of the at least one DMRS sequence being considered in ascending order.

A method of performing a 2-step random access procedure by a base station (BS) in a wireless communication system, the method comprising:

• transmitting configuration information related to a message A related to the 2-step random access procedure, wherein the message A comprises a physical random access channel (PRACH) preamble, a physical uplink shared channel (PUSCH), and a demodulation reference signal (DMRS) for the PUSCH;
• receiving the message A;
• and
• transmitting a message B related to the 2-step random access procedure in response to the message A,
• wherein the PUSCH is obtained based on a scrambling sequence related to a random access preamble identifier (RAPID) of the PRACH preamble,
• wherein the PUSCH is received in at least one PUSCH occasion among consecutive PUSCH occasions in a frequency domain and a time domain,
• wherein the consecutive PUSCH occasions are obtained based on the configuration information,
• wherein the configuration information comprises information regarding a number of physical resource blocks (PRBs) for the consecutive PUSCH occasions,
• wherein the PRACH preamble is obtained among at least one preconfigured PRACH preamble,
• wherein the DMRS is related to (i) at least one DMRS port and (ii) at least one DMRS sequence, and
• wherein the at least one preconfigured PRACH preamble is mapped to (i) the at least one DMRS port and then (ii) the at least one DMRS sequence based on (i) an index of each of the at least one DMRS port being considered in ascending order and then (ii) an index of each of the at least one DMRS sequence being considered in ascending order.

A base station (BS) configured to perform a 2-step random access procedure in a wireless communication system, the BS comprising:

• a transceiver;
• and
• at least one processor coupled to the transceiver,
• wherein the at least one processor is configured to:
• transmit configuration information related to a message A related to the 2-step random access procedure, wherein the message A comprises a physical random access channel (PRACH) preamble, a physical uplink shared channel (PUSCH), and a demodulation reference signal (DMRS) for the PUSCH;
• receive the message A;
• and
• transmit a message B related to the 2-step random access procedure in response to the message A,
• wherein the PUSCH is obtained based on a scrambling sequence related to a random access preamble identifier (RAPID) of the PRACH preamble,
• wherein the PUSCH is received in at least one PUSCH occasion among consecutive PUSCH occasions in a frequency domain and a time domain,
• wherein the consecutive PUSCH occasions are obtained based on the configuration information,
• wherein the configuration information comprises information regarding a number of physical resource blocks (PRBs) for the consecutive PUSCH occasions,
• wherein the PRACH preamble is obtained among at least one preconfigured PRACH preamble,
• wherein the DMRS is related to (i) at least one DMRS port and (ii) at least one DMRS sequence, and
• wherein the at least one preconfigured PRACH preamble is mapped to (i) the at least one DMRS port and then (ii) the at least one DMRS sequence based on (i) an index of each of the at least one DMRS port being considered in ascending order and then (ii) an index of each of the at least one DMRS sequence being considered in ascending order.