Method whereby terminal transmits and receives signals for carrying out random access channel procedure in wireless communication system, and device therefor

A device configured to transmit and receive signals for performing a 2-step random access channel (RACH) procedure in a wireless communication system comprising:

• at least one processor;
• and
• at least one memory operatively connected to the at least one processor, and configured to store instructions such that the at least one processor performs specific operations by executing the instructions,
• wherein the specific operations include:
• setting a RACH procedure to the 2-step RACH procedure based on a reference signal received power, RSRP of a pathloss reference signal being above a threshold, wherein the threshold is received via a radio resource control, RRC, signalling;
• receiving, from a base station, BS, both of a first parameter and a second parameter or receiving the second parameter without the first parameter,
• wherein the first parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message A physical uplink shared channel, PUSCH, for 2-step RACH procedure, and
• wherein the second parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message 3 PUSCH for 4-step RACH procedure;
• transmitting a message A including a preamble on a physical random access channel (PRACH) and the payload on the message A PUSCH according to an indicated transform precoding;
• and
• receiving a message B including contention resolution information from the BS,
• wherein, based on the first parameter being received, the first parameter is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure, and
• wherein, based on the first parameter not being received, a second parameter is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure.

A user equipment (UE) configured to transmit and receive signals for performing a 2-step random access channel (RACH) procedure in a wireless communication system comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operatively connected to the at least one processor, and configured to store instructions such that the at least one processor performs specific operations by executing the instructions,
• wherein the specific operations include:
• setting a RACH procedure to the 2-step RACH procedure based on a reference signal received power, RSRP of a pathloss reference signal being above a threshold, wherein the threshold is received via a radio resource control, RRC, signalling;
• receiving, from a base station, BS, both of a first parameter and a second parameter or receiving the second parameter without the first parameter,
• wherein the first parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message A physical uplink shared channel, PUSCH, for 2-step RACH procedure, and
• wherein the second parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message 3 PUSCH for 4-step RACH procedure;
• transmitting, to the base station (BS), a message A including a preamble on a physical random access channel (PRACH) and the payload on the message A PUSCH according to an indicated transform precoding;
• and
• receiving a message B including contention resolution information from the BS,
• wherein, based on the first parameter being received, the first parameter a is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure, and
• wherein, based on the first parameter not being received, a second parameter is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure.