Method and apparatus for transmitting and receiving signal in wireless communication system

A user equipment (UE) for transmitting and receiving signals in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operatively coupled to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform specific operations,
• wherein the specific operations comprise:
• selecting a synchronization signal and physical broadcast channel block (SSB);
• and
• transmitting, in a 4-step Random Access Channel (RACH) procedure, a physical random access channel (PRACH) through a specific RACH occasion (RO) among N number of ROs based on the SSB,
• wherein the ROs are configured for the 4-step RACH procedure and the N number of the ROs are frequency division multiplexed (FDMed),
• wherein an RO offset is based on a gap between (i) a starting RB index of a first RO with a lowest frequency among the ROs and (ii) a lowest RB index of a RB set including the first RO among RB sets,
• wherein each starting frequency position of N−1 number of second ROs among the ROs is determined based on (i) the RO offset and (ii) each lowest RB index of each RB set including each second RO among the RB sets, and
• wherein the specific RO is the first RO or one of the second ROs.

A method for transmitting and receiving signals by a base station operating in a wireless communication system, the method comprising:

• transmitting a synchronization signal and physical broadcast channel block (SSB);
• and
• receiving, in a 4-step Random Access Channel (RACH) procedure, a physical random access channel (PRACH) through a specific RACH occasion (RO) among N number of ROs based on the SSB,
• wherein the ROs are configured for the 4-step RACH procedure, and each of the N number of the ROs are included one by one in each of N number of Resource Block (RB) sets, and the N number of the ROs are Frequency Division Multiplexed (FDMed),
• wherein an RO offset is based on a gap between (i) a starting RB index of a first RO with a lowest frequency among the ROs and (ii) a lowest RB index of a RB set including the first RO among RB sets,
• wherein each of starting RB indices of N−1 number of second ROs among the ROs is determined based on (i) the RO offset and (ii) each lowest RB index of each RB set including each second RO among the RB sets, and
• wherein the specific RO is the first RO or one of the second ROs.

A base station for transmitting and receiving signals in a wireless communication system, the base station comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operatively coupled to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform specific operations,
• wherein the specific operations comprise:
• transmitting a synchronization signal and physical broadcast channel block (SSB);
• and
• receiving, in a 4-step Random Access Channel (RACH) procedure, a physical random access channel (PRACH) through a specific RACH occasion (RO) among N number of ROs based on the SSB,
• wherein the ROs are configured for the 4-step RACH procedure and the N number of the ROs are frequency division multiplexed (FDMed),
• wherein an RO offset is based on a gap between (i) a starting RB index of a first RO with a lowest frequency among the ROs and (ii) a lowest RB index of a RB set including the first RO among RB sets,
• wherein each of starting frequency position of N−1 number of second ROs among the ROs is determined based on (i) the RO offset and (ii) each lowest RB index of each RB set including each second RO among the RB sets, and
• wherein the specific RO is the first RO or one of the second ROs.