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Why security should be done before Handover message ?

+1 vote
Why security should be done before Handover message ?
posted Oct 10, 2013 by Neeraj Mishra

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1 Answer

+1 vote

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.

answer Oct 11, 2013 by Satyabrata Mahapatra
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+3 votes

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)?

+2 votes

In case of S1-handover with the MME relocation, source MME sends an information "Target Identification" to target MME.
What the target MME does by receiving TAC, when an enodeb can be identified uniquely by using combination of (PLMN + Macro/Home ENodeB) ?

Can someone tell me what the purpose behind to send TAC as part of Target Id IE ?

+4 votes

What is the use of TAI , which is included in handover required message ?

+2 votes

What is the reasoning behind to use different security keys after moving from one eNodeB to another eNodeB (Handover) ?

+5 votes

In case of horizontal handover UE is moved from one cell to another cell But with in the same ENB.
So in this case how the security is activated and how key derived ?