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why Ciphering is done for both user plane and control plane data, why not integrity done for both data in PDCP protocol

+1 vote
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why Ciphering is done for both user plane and control plane data, why not integrity done for both data in PDCP protocol

posted Jun 15, 2019 by Srujan Kumar

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+2 votes

I found 1st bit which is used to indicate that packet carrying Data/Control information. My question is that why first bit is used even packet itself known as "PDCP Data PDU".

+1 vote

After reading security protocol of LTE, I am wondering both AS integrity and ciphering are in PDCP by using PDCP SN.

But in WCDMA, RRC integrity is RRC layer, and RRC ciphering are in RLC as user plane data..
1) Why design as this in LTE?
2) LTE RRC seems have no RRC sequence number?

+2 votes

I know integrity protection is imposed for RRC messages that are exchanged between UE and eNodeB. What would be the reason for not having the integrity for user plane traffic ?

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