9.2.109 PDCP Change Indication

36.4233GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 Application Protocol (X2AP)

The PDCP Change Indication IE is used to require the MeNB to either initiate the security key update or to perform PDCP data recovery towards the UE (see TS 37.340 [15]).

IE/Group Name



IE Type and Reference

Semantics Description

PDCP Change Indication


(S-KgNB update required, PDCP data recovery required, …)

The value of S-KgNB update required indicates that the security key in en-gNB needs to be updated.

The value of PDCP data recovery required indicates that MeNB needs to perform PDCP data recovery.