2G Neighbours for 3G UMTS cell

3G to 2G per Neighbours stats shows HO attempts were made to undefined 2G Neighbours from 3G cell. How it is happening?

This is probably a db mismatch. Ideally, for a handover to 2G, you are defining not just the ARFCN but the cell ID and other details as well and hence a handover to “unknown” cell cannot happen.

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Vendor’s reply is that 2G neighbours may be defined for any one cell in Active set