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LTE: How the extraction of the security keys happens in horizontal handover ???

+5 votes
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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 ?

posted Feb 24, 2014 by Amit Sharma

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1 Answer

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In horizontal key derivation KeNB* key is generated using the KDF (using HMAC-SHA256 algorithm). The input would be current KeNB key and the NCC value would be incremented upon generation of KeNB* and the NCC value is send across UE. The KeNB* would be used as KeNB key.

answer Jun 12, 2014 by Sanjeet Kumar
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