Random access channel (rach) occasion assignment

A user equipment (UE) comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the memory and the processor are configured to:
• receive, from a base station (BS), a plurality of synchronization signal blocks (SSBs), each SSB associated with a different transmit beam of the BS;
• and
• transmit a random-access preamble on a first random access channel (RACH) occasion associated with a first SSB of the plurality of SSBs, wherein the first RACH occasion is one of a plurality of RACH occasions associated with the plurality of SSBs, wherein the first RACH occasion is selected based on measurements of the plurality of SSBs, wherein the first SSB is associated with a first number of the plurality of RACH occasions and a second SSB of the plurality of SSBs is associated with a second number of the plurality of RACH occasions, wherein the first number is different than the second number.

A base station (BS) comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the memory and the processor are configured:
• transmitting a plurality of synchronization signal blocks (SSBs), each SSB associated with a different transmit beam of the BS;
• and
• receiving, from a user equipment (UE), a random-access preamble on a first random access channel (RACH) occasion associated with a first SSB of the plurality of SSBs, wherein the first RACH occasion is one of a plurality of RACH occasions associated with the plurality of SSBs, wherein the first SSB is associated with a first number of the plurality of RACH occasions and a second SSB of the plurality of SSBs is associated with a second number of the plurality of RACH occasions, wherein the first number is different than the second number.