Could you provide more information about your problem ?
– on one cell only, or on many cells ?
– what is the design of your network ? (dualband cells ? overlaid 1800 cells ?)
– do you have interference problems in 1800 ?
DL Quality HO = 96%, on so many cells … itcan be due to
– bad parameters (check your HO DL QUAL thresholds… it should be around 4 or 5)
– extremely poor frequency planning