PDN Attach with Offline and Online Rules

The following call flow and procedure describes PDN attach when dynamic rule with both online and offline is enabled through Gx, Gy, and Gz interfaces.

Call Flow
Call Flow Description for PDN Attach with Offline and Online Rules
Step Description
1

SMF sends Gx CCR-I towards PCRF.

2

PCRF sends Gx CCA-I towards SMF with default bearer having Dynamic rule with OFFLINE_ENABLED set to True.

3

The N4 Establishment Request is sent towards UPF based on the following conditions:

  • CREATE_URR for default bearer level URR, if:

    • PFCP_IE_URR_ID is set to 0x80000002 for default bearer level URR

  • CREATE_URR for offline SDF level URR, if:

    • PFCP_IE_VOLUME_THRESHOLD and PFCP_IE_TIME_THRESHOLD has egcdr threshold values configured in the GTPP profile.

  • CREATE_URR for Online URR, if:

    • PFCP_IE_URR_ID has unique online UrrId

    • PFCP_IE_VOLUME_THRESHOLD and PFCP_IE_TIME_THRESHOLD has threshold values received from OCS

    • PFCP_IE_MEASUREMENT_METHOD is set based on quota received from OCS.

  • PDR created for dynamic rule (online+offline) is mapped to online, offline SDF and bearer level URR.

4

UPF sends N4Establishment response.