Section: 6.7.3.2 N2-handover
Content: At handover from a source gNB/ng-eNB to a target gNB/ng-eNB over N2 (possibly including an AMF change and hence a transfer of the UE's 5G security capabilities from the source AMF to the target AMF), the target AMF shall send the UE's 5G security capabilities to the target gNB/ng-eNB in the NGAP HANDOVER REQUEST message (see TS 33.413[ None ]  [34]). The target gNB/ng-eNB shall select the algorithm with highest priority from the UE's 5G security capabilities according to the locally configured prioritized list of algorithms (this applies for both integrity and ciphering algorithms). The chosen algorithms shall be indicated to the UE in the Handover Command message if the target gNB/ng-eNB selects different algorithms compared to the source gNB/ng-eNB. If the UE does not receive any selection of integrity and ciphering algorithms, it continues to use the same algorithms as before the handover (see TS 38.331[ NR; Radio Resource Control (RRC); Protocol specification ]  [22]). For N2-handover, the source gNB/ng-eNB shall include AS algorithms used in the source cell (ciphering and integrity algorithms) in the source to target transparent container that shall be sent to the target gNB/ng-eNB. The AS algorithms used by the source cell are provided to the target gNB/ng-eNB so that it can use them during the potential RRC Connection Re-establishment procedure use them as specified in clause 6.11 for gNB and TS 33.401[ 3GPP System Architecture Evolution (SAE); Security architecture ]  [10] for ng-eNB.