Usage Reporting in PFCP Modification Response
The UPF sends session modification response after receiving session modification request based on the IEs received in the request message. The UPF includes usage report IE in the session modification response for the following scenarios:
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Query URR Handling—The URR-Id IE is included when the SMF requests immediate usage reports from the UPF in the session modification response (for the URR-Id present in this specific IE).
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Query All URRs (QAURR) Handling—The UPF sends the usage report with session modification response for all the URRs provisioned prior by the SMF for this PFCP session once it receives the QUARR flag set in PFCPSMReq-Flags IE from SMF.
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Update URR—The SMF updates the new value of the existing IE with the old value during the session modification procedure.
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Remove URR—During the session modification procedure, the SMF removes the IE, which is not received but was available earlier.