Pix is right and its an error if we have co-bcch cells and HO success rate will be bad due to it, is it ZTE iBSC or V2 where you have implemented it and where exactly in ICM
so i assume that before, you were having only 1 band, the GSM 900.
And now, you added a second layer of cells, in DCS1800.
You will have to optimize the parameters that control HO and Reselection between GSM and DCS. That is something that is dificult to do and that requires perfect knowledge of algorithms in your system. ndeed, those algo are very “proprietary”.
If you were using ALU I could help you.
Regards
pix
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