RAN/NAS Cause IE
SMF receives the RAN/NAS Cause IE from access network in the GTP messages due to QoS flow termination or PDU session termination. SMF provides the received cause in the ranNasRelCauses attribute of the RuleReport to PCF. For more information about this cause, see the 3GPP TS 29.274 version 15.4.0.
The RAN/NAS Cause IE supports the following GTP messages:
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Create Bearer Response
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Update Bearer Response
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Delete Bearer Command
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Delete Session Request