Section: A.11 KNG-RAN* derivation function for target gNB
Content: When deriving a KNG-RAN* from current KgNB or from fresh NH and the target physical cell ID in the UE and NG-RAN for handover purposes and transition from RRC_INACTIVE to RRC_CONNECTED states the following parameters shall be used to form the input S to the KDF. - FC = 0x70 - P0 = PCI (target physical cell id) - L0 = length of PCI (i.e. 0x00 0x02) - P1 = ARFCN-DL (the absolute frequency of SSB of the target PCell as specified in clause 13.3 of TS 38.300[ NR; NR and NG-RAN Overall description; Stage-2 ]  [52]) - L1 = length of ARFCN-DL (i.e. 0x00 0x03) The input key KEY shall be the 256-bit NH when the index NCC in the handover increases, otherwise the current 256-bit KgNB(when source is gNB) or KeNB (when source is ng-eNB).