Section: A.12 KNG-RAN* derivation function for target ng-eNB
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 = 0x71 - P0 = PCI (target physical cell id) - L0 = length of PCI (i.e. 0x00 0x02) - P1 = EARFCN-DL (target physical cell downlink frequency) - L1 = length of EARFCN-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).