Section: 7.3.18 Configuration Transfer Tunnel
Content: A Configuration Transfer Tunnel message shall be used to: - tunnel eNodeB Configuration Transfer messages from a source MME to a target MME over the S10 interface. The purpose of the eNodeB Configuration Transfer is to transfer information from an eNodeB to a target eNodeB or an en-gNB connected to a target eNB in unacknowledged mode (see 3GPP TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [10]). - tunnel eNodeB Configuration Transfer messages from a source MME to a target AMF, or to tunnel Uplink RAN Configuration Transfer messages from a source AMF to a target MME, over the N26 interface. This is to transfer RAN configuration information or inter-system SON configuration information between an eNodeB and a gNB in unacknowledged mode (see 3GPP TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [10] and 3GPP TS 38.413[ NG-RAN; NG Application Protocol (NGAP) ]  [84]). Table 7.3.18-1 specifies the presence requirements and conditions of the IEs in the message. Table 7.3.18-1: Information Elements in a Configuration Transfer Tunnel Message