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:

  • Xn Handover

  • Intra-AMF N2 Handover

  • Inter-AMF N2 Handover

The following features are related to this use case: