Section: 5.2 Requirements on the UE 5.2.1 General
Content: The support and usage of ciphering and integrity protection between the UE and the ng-eNB is identical to the support and usage of ciphering and integrity protection between the UE and the eNB as specified in TS 33.401[ 3GPP System Architecture Evolution (SAE); Security architecture ]  [10] with the following additional requirement(s): - The UE shall support the use of integrity protection with the ng-eNB over the Uu interface if it supports E-UTRA connected to 5GC. - The UE shall indicate its support of integrity protection with the ng-eNB if it supports E-UTRA connected to 5GC. The PEI shall be securely stored in the UE to ensure the integrity of the PEI.