external handover success > “external ?” handover attempts . it shouldn’t be possible, if what you’re looking at is correct.
By the way, why don’t you give us a full example of a report ? with internal & external ho requests, attempts and success ?
In what network entity (MSC or BSC) these counters are registered?
What counters constitute the externalHandoverSuccess?
Handover attempts in MSC are only inter-BSC handover attempts and Inter-Msc from MSCA to MSCB handover attempts, but not from MSCB to MSCA and subsequent handovers.
I am using Siemens BSS and I never seen that case. Yes you are using a right formula.
From where did you get these values? Spots? Can you check the values inside the measurement file getting from BSC?