Deactivation of the User Plane Connection of a PDU Session
The deactivation procedure releases the logical NG-AP signaling connection and the associated N3 user plane connections, and (R)AN RRC signaling and resources.
The following reasons can trigger the initiation of AN release:
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(R)AN-initiated with cause
For example, O&M intervention, unspecified failure, (R)AN (for example, Radio) link failure, user inactivity, inter-system redirection, request for establishment of QoS flow for IMS voice, release due to UE-generated signaling connection release, mobility restriction, and so on.
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AMF-initiated with cause
For example, unspecified failure.