Sorry, I’m quite in a hurry:
Euge > if there is HO failures, it means the neighbors are well defined in the BSC but there is an issue within the BSC itself.
You confirm that the HO fails between 2 cells within the same BSC ?
During drivetests, the MS receives a HO CMD. Then the MS sends HO ACCESS to the target cell.
Could you analyze both messages in TEMS, what are the contents you see ? Do they match the actual description of the neighbor cell ?
If you can, try to perform some Abis interface on serving and target cell. If you see that the BTS sends a message to the BSC, and receives a response = HO FAILURE, then you can simply assume the BSC has a problem… so raise the issue to your ericsson support