Charging Session

The SMF supports converged session-based charging (SCUR) as specified in 3GPP TS 32.290, section 5.3.2.3. If Gy is enabled, SMF supports session-based charging as specified in 3GPP TS32.299, 12.9.0 section 6.4.

The SMF establishes a charging session with the CHF with the Charging Data Request and Response (Initial) exchange. During the life of the PDU session, usage is reported with a Charging Data Request or Response (Update) exchange. After the session is released, Charging Data Request or Response (Termination) messages are exchanged.

In the case of a 4G session if Gy is enabled, then SMF establishes charging session with OCS by sending credit control request and credit control response (initial) message exchange. During the PDU session, the usage is reported with credit control request and credit control response (update) messages. After the session release, credit control request and credit control response (terminate) messages are exchanged.