Access and Mobility Support
The SMF supports the access and mobility through session management procedures for PDU session establishment, modification, and release. The SMF supports N2-based handovers for intra-SMF or inter-AMF when a UE moves from one NG-RAN to another NG-RAN for Data Forwarding Tunnel (DFT) and Indirect Data Forwarding Tunnel (IDFT) cases. With the multi-DNN support, SMF has multiple PDN connections for providing various services including Internet and Voice over New Radio (VoNR) services. The SMF supports network-initiated messages when a UE is either in the CM-Idle state or in the CM-Connected state.
Access and mobility support includes the intra-5G handover use case, which has the following handover support:
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Xn Handover
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Intra-AMF N2 Handover
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Inter-AMF N2 Handover
The following features are related to this use case: