How it Works
For this feature, SMF supports the following IE and cause values:
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Decode "Criticality Diagnostics" IE, which SMF receives as part of the following N2 messages:
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PDU Session Resource Setup Unsuccessful Transfer
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PDU Session Resource Modify Unsuccessful Transfer
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Handle the following N2 cause values in PDU Session Resource Setup Unsuccessful Transfer:
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Radio Network Layer cause values:
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Unspecified
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Multiple PDU Session ID instances
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NG intra-system handover triggered
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NG inter-system handover triggered
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Xn handover triggered
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UP integrity protection not possible
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UP confidentiality protection not possible
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UE maximum integrity protected data rate reason
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Protocol cause values:
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Transfer syntax error
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Abstract syntax error (reject)
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Abstract syntax error (ignore and notify)
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Message not compatible with receiver state
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Semantic error
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Abstract syntax error (falsely constructed message)
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Unspecified
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Miscellaneous cause values:
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Not enough user plane processing resources
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Handle the following N2 cause values in PDU Session Resource Modify Unsuccessful Transfer:
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Radio Network Layer cause values:
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Unspecified
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Unknown PDU Session ID
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Multiple PDU Session ID instances
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IMS voice EPS fallback or RAT fallback triggered
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NG intra-system handover triggered
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NG inter-system handover triggered
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Xn handover triggered
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Protocol cause values:
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Transfer syntax error
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Abstract syntax error (reject)
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Abstract syntax error (ignore and notify)
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Message not compatible with receiver state
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Semantic error
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Abstract syntax error (falsely constructed message)
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Unspecified
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Miscellaneous cause values:
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Hardware failure
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Unknown PLMN
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Send the following N2 cause values in PDU Session Resource Release Command Transfer:
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Radio Network Layer cause values:
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Unspecified
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Release due to 5GC generated reason
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NAS cause values:
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Normal release
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Authentication failure
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Deregister
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Unspecified
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Handle the following N2 Cause values in Path Switch Request Setup Failed Transfer
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Radio Network Layer cause values:
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Unspecified
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No radio resources available in target cell
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Radio resources not available
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Slices not supported
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Resources not available for the slices
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UP integrity protection not possible
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UP confidentiality protection not possible
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Not supported 5QI value
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Encryption and/or integrity protection algorithms not supported
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No radio resources available in target cell
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Generate an error-level log after SMF receives the N2 cause for a failure cause and debug-level log for a successful cause.
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Maintain statistics based on N2 cause that SMF receives for PDU Session Resource Setup Unsuccessful Transfer, PDU Session Resource Modify Unsuccessful Transfer, and Path Switch Request Setup Failed Transfer messages.
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Maintain statistics based on the N2 cause sent in PDU Session Resource Release Command Transfer message.