Method executed by user equipment and user equipment

1. A method performed by a user equipment, the method comprising:

obtaining a parameter related to generation of an orthogonal frequency division multiplexing (OFDM) baseband signal of a physical random access channel (PRACH); and

generating the OFDM baseband signal of the PRACH according to the parameter by using an OFDM baseband signal generation formula for the PRACH,

wherein:

the OFDM baseband signal generation formula includes an item indicating a location of a lowest numbered subcarrier of a lowest numbered resource block, which is occupied by a PRACH transmission occasion in a frequency domain used by the OFDM baseband signal, in a resource grid,

the resource grid corresponds to a subcarrier spacing configuration of an uplink bandwidth part (BWP),

the uplink BWP is either an initial active uplink BWP for an initial access or an active uplink BWP for a non-initial access,

the item includes an offset of the lowest numbered subcarrier of the lowest numbered resource block occupied by the PRACH transmission occasion with respect to a lowest numbered subcarrier of a lowest numbered resource block of the resource grid,

the offset is expressed as

(N BWP,i start −N grid start,μ )N SC RB +n RA start N SC RB +n RA N RB RA N SC RB

N BWP,i start is a lowest numbered resource block of the uplink BWP, which uses the numbering of common resource blocks,

N grid start,μ is the lowest numbered resource block of the resource grid, which uses the numbering of common resource blocks,

N SC RB is a number of subcarriers in one resource block,

N RA start is an offset of the lowest numbered resource block occupied by the lowest PRACH transmission occasion with respect to the lowest numbered resource block of the uplink BWP,

n RA is an index of the PRACH transmission occasion, and

N RB RA is a number of resource blocks occupied by each PRACH transmission occasion in the frequency domain.

2. The method according to claim 1 , wherein:

the item is expressed as

k 1 =k 0 μ +( N BWP,i start −N grid start,μ ) N SC RB +n RA start N SC RB +n RA N RB RA N SC RB −N grid size,μ N SC RB /2,

and

k 0 μ −N grid size,μ N SC RB /2 corresponds to the lowest numbered subcarrier of the lowest numbered resource block of the resource grid.

3. The method according to claim 1 , wherein a reference subcarrier spacing configuration in the OFDM baseband signal generation formula is set as a value determined according to one or more subcarrier spacing configurations in an indication information received by the user equipment.

4. The method according to claim 3 , wherein the reference subcarrier spacing configuration is set as a subcarrier spacing configuration used by a synchronization signal/physical broadcast channel (SSB) block.

5. A user equipment, comprising:

at least one processor; and

at least one non-transitory computer-readable medium coupled to the at least one processor, and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the user equipment to

obtain a parameter related to generation of an orthogonal frequency division multiplexing (OFDM) baseband signal of a physical random access channel (PRACH); and

generate the OFDM baseband signal of the PRACH according to the parameter by using an OFDM baseband signal generation formula for the PRACH,

wherein

the OFDM baseband signal generation formula includes an item indicating a location of a lowest numbered subcarrier of a lowest numbered resource block, which is occupied by a PRACH transmission occasion in a frequency domain used by the OFDM baseband signal, in a resource grid,

the resource grid corresponds to a subcarrier spacing configuration of an uplink bandwidth part (BWP),

the uplink BWP is either an initial active uplink BWP for an initial access or an active uplink BWP for a non-initial access,

the item includes an offset of the lowest numbered subcarrier of the lowest numbered resource block occupied by the PRACH transmission occasion with respect to a lowest numbered subcarrier of a lowest numbered resource block of the resource grid,

the offset is expressed as

(N BWP,i start −N grid start,μ )N SC RB +n RA start N SC RB +n RA N RB RA N SC RB ,

N BWP,i start is a lowest numbered resource block of the uplink BWP, which uses the numbering of common resource blocks,

N grid start,μ is the lowest numbered resource block of the resource grid, which uses the numbering of common resource blocks,

N SC RB is a number of subcarriers in one resource block,

n RA start is an offset of the lowest numbered resource block occupied by the lowest PRACH transmission occasion with respect to the lowest numbered resource block of the uplink BWP,

n RA is an index of the PRACH transmission occasion, and

N RB RA is a number of resource blocks occupied by each PRACH transmission occasion in the frequency domain.

6. The UE according to claim 5 , wherein:

the item is expressed as

k 1 =k 0 μ +( N BWP,i start −N grid start,μ ) N SC RB +n RA start N SC RB +n RA N RB RA N SC RB −N grid size,μ N SC RB /2,

and

k 0 μ −N grid size,μ N SC RB /2 corresponds to the lowest numbered subcarrier of the lowest numbered resource block of the resource grid.

7. The UE according to claim 5 , wherein a reference subcarrier spacing configuration in the OFDM baseband signal generation formula is set as a value determined according to one or more subcarrier spacing configurations in an indication information received by the user equipment.

8. The UE according to claim 7 , wherein the reference subcarrier spacing configuration is set as a subcarrier spacing configuration used by a synchronization signal/physical broadcast channel (SSB) block.