Section: A.23 KIAB generation function
Content: This input string is used when the IAB-node and the IAB-donor derive KIAB (PSK) for establishment of secure F1 interface. The following parameters shall be used to form the input S to the KDF: - FC = 0x83, - P0 = IAB-donor-CU IP address, - L0 = length of IAB-donor-CU IP address, - P1 = IAB-node DU IP address, - L1 = length of IAB-node DU IP address. The input key KEY shall be KgNB, if the key KgNB is in possession of the IAB-UE functionality in the IAB-node and in the IAB-donor-CU (also when acts as MN for NR-DC scenario), after the IAB-UE setup procedure (Phase-1). The input key KEY shall be S-KgNB, if the key S-KgNB is in possession of the IAB-UE functionality in the IAB-node and in the IAB-donor-CU (acts as a SN for EN-DC scenario), after dual connectivity procedure. The input key KEY shall be KSN, if the key KSN is in possession of the IAB-UE functionality in the IAB-node and in the IAB-donor-CU (acts as a SN for NR-DC scenario), after dual connectivity procedure. For P0, in case of CP-UP separation of IAB-donor-CU, - P0 shall be set to IAB-donor-CU-CP IP address for deriving KIAB-CU-CP. - P0 shall be set to IAB-donor-CU-UP IP address for deriving KIAB-CU-UP. The entire output of the KDF (256 bits) is used as the KIAB or KIAB-CU-CP or KIAB-CU-UP..