Handling of Initial Event in Charging Component
The session context of SMF is configured with trigger/threshold as per the default described in 3GPP TS 32.255. It overrides the same based on configuration present in the charging profile. The same values can be further overridden by CHF Charging Data Response Initial. Currently, trigger/threshold cannot be overridden when in PDU Establishment state.
The charging profile is referenced from the charging-characteristic profile. The CC profile is taken from UDM subscription for PDU session. If the CC profile is not mentioned in the UDM response, it is taken from the DNN profile.
After trigger/threshold/quota are determined, the SMF N4 Setup Request with set of Create URRs are derived from charging-data with one session-level URR.
If the session-level reporting is determined, the session-level URR is associated to each SDF URR.
The following triggers are supported:
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Volume/Time trigger at session/RG level
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AMBR change
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QoS change
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Quota threshold and quota exhausted
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Quota handling time
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Tariff time change