Section: 9.3.2.2 Handover and redirection
Content: The source NG-RAN node decides between handover or redirection to EPS based on radio criteria and availability of the N26 interface. NOTE: Information about the availability of the N26 interface may be configured by OAM at the NG-RAN. Inter RAT handover is characterised by the following: - The Source RAT configures Target RAT measurement and reporting. - The source RAT decides on the preparation initiation and provides the necessary information to the target RAT in the format required by the target RAT. - Radio resources are prepared in the target RAT before the handover. - The RRC reconfiguration message from the target RAT is delivered to the source RAT via a transparent container, and is passed to the UE by the source RAT in the handover command. - In-sequence and lossless handovers are not supported. - Security procedures for handover to E-UTRA/EPC should follow E-UTRA handover procedures.