name: EARFCN-DL
full_form: E-UTRA Absolute Radio Frequency Channel Number-Down Link
context: When deriving a KeNB* from current KeNB or from fresh NH and the target physical cell ID in the UE and eNB as specified in clause 7.2.8 for handover purposes the following parameters shall be used to form the input S to the KDF. - FC = 0x13 - 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. L1 = 0x00 0x02 if EARFCN-DL is between 0 and 65535, and L1 = 0x00 0x03 if EARFCN-DL is between 65536 and 262143) NOTE: The length of EARFCN-DL cannot be generally set to 3 bytes for backward compatibility reasons: A Rel-8 entity (UE or eNB) would always assume an input parameter length of 2 bytes for the EARFCN-DL. This would lead to different derived keys if another entity assumed an input parameter length of 3 bytes for the EARFCN-DL. The input key shall be the 256-bit NH when the index in the handover increases, otherwise the current 256-bit KeNB.
description: EARFCN-DL is a parameter that identifies the downlink frequency of a physical cell in the E-UTRA (Evolved Universal Terrestrial Radio Access) network. It is crucial for handover procedures and key derivation functions as defined in clause 7.2.8 of 3GPP TS 33.401.
explanation: EARFCN-DL is a specific value used to configure and identify a network element (the downlink frequency of a cell) within the E-UTRA network, making it a network parameter.
section_title: A.5	KeNB* derivation function
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