Random access resource configuration for message 1 transmission

A user equipment (UE), comprising:

• one or more non-transitory computer-readable media storing one or more computer-executable instructions for controlling random access (RAR) preamble transmission;
• and
• at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the one or more computer-executable instructions to cause the UE to:
• receive, from a base station (BS), a message comprising a random access channel (RACH) resource configuration comprising:
• a first random access (RA) configuration comprising a first plurality of parameter sets for configuring legacy random access channel occasions (ROs) not within a subband full duplex (SBFD) region in time domain, and
• a second RA configuration comprising a second plurality of parameter sets for configuring additional ROs within the SBFD region in time domain;
• determine a preamble partitioning of the legacy ROs using a first parameter set in the first plurality of parameter sets;
• determine a preamble partitioning of the additional ROs using a second parameter set in the second plurality of parameter sets;
• and
• at a time instant, select one of the first RA configuration or the second RA configuration for the RAR preamble transmission.