At least NSN/Nokia BSS has algorithm which detects, if RACH is real one or phantom one, and if I remember correctly, there’s one counter in statistics, where you see how many phantom RACH msg has been received within the measurement period.
Phantom, dummy or Ghost, are the same;
RX lev. of MS higher than cell acceptability (RACH MINI. access lev.) or may be higher than its TA acceptability (MAX TA) because of:
– Overshooting: need physical parameter adjustment.
– BSS parameters: need BSS parameter adjustment(TA MR Control parameter, Access level control parameters, RACH Access control parameter …).
and the main effect will be on SDCCH performance.