RACH optimization: preamble config, power ramping, target received power

RACH Preamble Configuration

The Random Access Channel (RACH) is the UE's gateway to the network — every initial access, handover, beam recovery, and scheduling request transitions through RACH. Optimizing RACH parameters directly impacts accessibility, handover performance, and user-perceived latency. NR supports 64 preambles per RACH occasion, divided between contention-based (CBRA) and contention-free (CFRA) pools. CFRA preambles are dedicated to specific UEs during handover and beam failure recovery — the gNB assigns a specific preamble in the HO command, guaranteeing collision-free access. CBRA preambles are shared…