How it Works

The SMF sends the quota validity time towards the N4 in “tm_quta” in PFCP_IE_TIME_QUOTA IE. If SMF receives only Quota validity time from CCAI/CCAU or both cc-Time and validity-time are received and validity time is less. If both values are equal then SMF sends cc-Time value in tm_quta. The SMF does not forward the 3GPP-Time-Quota-Threshold to N4, if quota validity time is selected.

If received quota holding time is valid, the SMF sends the quota holding time towards the N4.

Note
  • Zero Validity Time:

    In SMF validity time or holding time values are forwarded to N4, if validity time or holding time values received from CCRI/CCRU are 0. The SMF relays 0 because honouring 0 is mechanism to disable armed timer at UPF. QVT and QHT implementation is aligned with SMF if validity time or holding time values are received from CCRI/CCRU are 0.

  • QHT trigger received:

    In SMF, volume_msrmt, duration_msrmt are recived along with quhti trigger, CCRU sends volume_msrmt, duration_msrmt inside USU and updates reporting reason as QHT in MSCC level and also sends “Requested-Service-Unit”. QHT implementation is aligned with SMF if volume_msrmt, duration_msrmt are recived along with quhti trigger.