Why security should be done before Handover message ?

Question

Suppose I have two eNBs, configured as S1 intra-frequency neighbours and my UE is attached to one of them. There is no X2 connection present between them.
Now, I have done admin down to the source eNB. So, HO process is triggered. As a consequence of this, source eNB sends HO required message to MME.

My query is, in this HO required message, what should be the value of ac-BarringFactor??
Should it be P00 or the last value set before admin down(e.g., P95)?

Answer 1

Security check before any Handover is very important. Because, any failure within the Handover (or handoff) procedure will lead to dropped calls which will in turn result in user dissatisfaction and ultimately it may lead to users changing networks, thereby increasing the churn rate.