What is the RACH PRB size for the NR cell ?Is it same as LTE?Is so what is the sub carrier spacing?

Question

MCS,RB to TB size mapping is common for all the sub carrier spacing or is it different each configuration?

Answer 1

PRACH size in terms of PRBs depends upon the preamble format chosen and it can vary from 6 PRBs to 24 PRBs in NR. Also PRACH SCS changes with sequence length or preamble format and can be 1.25, 5, 15, 30, 60 or 120 KHz. For LTE, I think PRACH size in terms of PRBs is fixed to 6 and SCS is always 15Khz.

Answer 2

Perhaps it will vary according to NR numberology .