Method and apparatus for performing communication in wireless communication system

A base station (BS), the BS comprising:

• a transceiver;
• and
• a processor configured to:
• transmit, via the transceiver, random access channel (RACH) configuration information to a user equipment (UE), and
• receive, via the transceiver, msgA based on random access occasion and PUSCH occasion identified based on the RACH configuration information,
• wherein in case that a type of a random access is identified as 2-step contention free based on the RACH configuration information,
• a synchronization signal block (SSB) with synchronization signal-reference signal received power (SS-RSRP) above a configured threshold among SSBs is selected at the UE,
• the random access occasion corresponding to the selected SSB is identified at the UE,
• the PUSCH occasion corresponding to a RACH slot of the identified random access occasion from PUSCH occasions is identified at the UE, and
• the PUSCH occasions are configured based on PUSCH resource configuration information included in the RACH configuration information.

A method of performing communication by a user equipment (UE), the method comprising:

• receiving random access channel (RACH) configuration information from a base station (BS),
• in case that a type of a random access is identified as 2-step contention free based on the RACH configuration information,
• selecting a synchronization signal block (SSB) with synchronization signal-reference signal received power (SS-RSRP) above a configured threshold among SSBs,
• identifying a random access occasion corresponding to the selected SSB,
• identifying a physical uplink shared channel (PUSCH) occasion corresponding to a RACH slot of the identifying random access occasion from PUSCH occasions configured based on PUSCH resource configuration information included in the RACH configuration information, and
• performing msgA transmission based on the identified random access occasion and the identified PUSCH occasion.

A method of performing communication by a base station (BS), the method comprising:

• transmitting random access channel (RACH) configuration information to a user equipment (UE), and
• receiving msgA based on random access occasion and PUSCH occasion identified based on the RACH configuration information,
• wherein in case that a type of a random access is identified as 2-step contention free based on the RACH configuration information,
• a synchronization signal block (SSB) with synchronization signal-reference signal received power (SS-RSRP) above a configured threshold among SSBs is selected at the UE,
• the random access occasion corresponding to the selected SSB is identified at the UE,
• the PUSCH occasion corresponding to a RACH slot of the identified random access occasion from PUSCH occasions is identified at the UE, and
• the PUSCH occasions are configured based on PUSCH resource configuration information included in the RACH configuration information.