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What are all scenarios for PDCP re-establishment?

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As we know, PDCP reestablishment will clear the existing bearer . but what are all the scenario PDCP will be reestablished?

posted Oct 30 by Himani

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However All the protocol is reestablishing but what is the use of keeping AM state variables same

+1 vote

I was going through the security specification of 5G network and stopped at a point where it was mentioned that UE shall support integrity protection of user data along with the integrity protection of RRC and NAS-Signalling. Section 5.1.3.1 also mentions that integrity protection of the user data between UE and gNB is optional to use.
I want to know that for which cases/scenarios, it would be needed to enable integrity protection for user data between UE and gNB ?
Enabling both integrity and ciphering for the user data would be an overhead, therefore I started thinking about scenarios/cases.

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