Modifications for PCF-initiated Inactive to Idle State
This section describes about the inactive to idle state activities in the PCF-initiated modification call flow procedure.
The following figure describes the Modifications for PCF-initiated Inactive to Idle State call flow.

Step |
Description |
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1 |
The PCF sends the SMF Policy Association Modification Request to the SMF. It’s an interchangeable action as it also receives the same message from the SMF. |
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2 |
The SMF sends the Namf Comm N1N2MessageTransfer Request to the AMF. It’s an interchangeable action as it also receives the same message from the AMF. |
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3 |
The AMF sends the PDU Session Resource Modify Request to the RAN.
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4 |
The RAN sends the PDU Session Resource Modify Response Unsuccessful message to the AMF. It also includes the unknown failure cause message. |
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5 |
The AMF sends the Nsmf PDUSession UpdateSMContext (N2SMlnfo) response message to the SMF. It’s an interchangeable action as it also receives the same message from the SMF.
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6 |
The SMF resends the PDU Session Resource Modify message to the AMF.
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