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Maybe it's not important to you, but it's mine!
I have just read about this case. At first I felt strange in hearing it, because I haven’t heard it before. We know about BCCH Freq and BSIC, don’t we?
If there are two BTSs are close each others with different BCCH and different BSIC, It will not be a problem. Each BTS will erceive RACH from its own MSs.
But If those two BTSs have different BSICs but have same BCCHs, It may cause Phantom RACH. MS will transmit a RACH to those two BTSs with just one certain BSIC. The BTS who has this BSIC will responce this RACH, but the other BTS who doesn’t have this BISC will not response RACH. This is what we call Phantom RACH or Ghost RACH.