when incoming HO towards a certain TCH/BSIC of cell “A”, this will also be heard in the neighbour “B” using same BCCH/BSIC couple as the TCH/BSICof “A”.
The HO ACCESS in UL on TCH/BSIC A is decoded also as a CHANNEL REQUEST on BCCH/BSIC “B”. Cell B is allocating a SDCCH channel for that “ghost”. Since there are four consecutive HO ACCESS for each HO attempt, it means that B is allocating 4 SDCCH channel per HO. B will face big SDCCH congestion.