Offline Static or Predefined Rules
The following call flow and procedure describes the Usage report in N4 session report with Volume/Time threshold for the offline Bearer or SDF level, or SDF level URR for Predefined and Static Rules.

Step | Description | ||
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1 |
PCRF performs Gx-CCR or CCA exchange with SMF. In this exchange, the SMF receives Predefined Rules for default bearer from the PCRF. |
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2 |
SMF initiates N4 session establishment request exchange with UPF. In the same request, UPF relays the PFCP message exchange.as response. |
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3 |
SMF sends Create session request to the S-GW and GTPP response message is exchanged. |
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4 |
SMF sends N4 Session Report Request/Response exchange with offline Volume/Time threshold. When SMF receives the SDF level or Bearer/SDF level usage report with VOLTH/TIMTH for static/predefined rules, the Bearer/SDF level URR is created at SMF if not there, and the SDF level URR gets linked to the Bearer level URR. |
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5 |
SMF sends GTPP Data Record Transfer Request with SDF Containers to the Offline Charging Server (OFCS). This request is sent with one or multiple SDFs with volume usage and serviceConditionChange—one for each RG+service ID.
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6 |
OFCS sends GTPP Data Record transfer response to the SMF. |
Sample Configuration
The following is a sample message output for offline SDF level URR Id for static rule Usage report:
URR ID:
Type: 81 Length: 4
Value: 0x80000021.
USAGE REPORT TRIGGER:
Type: 63
Vol Threshold
VOLUME MEASUREMENT:
Type: 66
Total Volume: 400
Uplink Volume: 200
Downlink Volume: 200
accessPointNameNi cisco.com
ratingGroup 101
chargingRuleBaseName prepaid
resultCode 2001
localSequenceNumber 1
timeOfFirstUsage 220920093554-0400
timeOfLastUsage 220920093558-0400
timeUsage 4
serviceConditionChange Volume Exhaust
qCI 5
maxRequestedBandwithUL 512000
maxRequestedBandwithDL 512000
guaranteedBitrateUL 0
guaranteedBitrateDL 0
aRP 84
servingNodeAddress 192.60.7.31
datavolumeFBCUplink 200
datavolumeFBCDownlink 200
timeOfReport 220920093601-0400
userLocationInformation
Location Type CGI
MCC 404
MNC 43
LAC 0x84C
CI 0x4F0A