Nsmf_PDUSession

The Nsmf_PDUSession service operates on the PDU Sessions. The service operations exposed by this service allows other NFs to establish, modify and release the PDU Sessions. The following are the key functionalities of this NF service:

  • Creation, modification and deletion of SM contexts for PDU Sessions upon receiving N1 message notification from AMF carrying the NAS SM messages. An SM context represents an association between the NF Service Consumer (for example, AMF) and the SMF for a PDU session;

  • Retrieval of SM contexts of PDU sessions, for example, to move PDU sessions towards the EPC using the N26 interface;

  • Creation, modification and deletion of PDU sessions between the V-SMF and H-SMF, in HR roaming scenarios;

  • Association of policy and charging rules with PDU Sessions and binding the policy and charging rules to flows;

  • Interacting with the UPF over N4 for creating, modifying and releasing user plane sessions;

  • Process user plane events from the UPF and apply the corresponding policy and charging rules.

Reference: 3GPP TS 29.502 version 15.0.0 Release 15