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Why security algorithms are implemented in PDCP layer and why not in other layers like RLC/MAC/RRC ?

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Why security algorithms are implemented in PDCP layer and why not in other layers like RLC/MAC/RRC ?
posted May 4, 2016 by anonymous

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1 Answer

+1 vote

PDCP layer is last one who interacts with the IP layer in the user plane or the RRC layer in the control plane.
So in case of AS security i.e secure delivery of RRC msgs in control plane and secure delivery of IP packets in user plane, PDCP is best option.

Please correct me !!

answer May 6, 2016 by Bhaskar Kalaria
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+2 votes

As RLC layer Seq. numbering is used to keep a track of packets to ARQ and PDCP, then SN should be given to RLC PDU, otherwise how it will happen in case of Segmentation and Re-segmentation?

+3 votes

SN is used for sequence delivery then why do we need two SN in PDCP and RLC?

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