PDU Session Resource Release Command Transfer IE

For each PDU session resource to be released, SMF includes PDU Session Resource Release Command Transfer IE with a cause value. This value includes details on cause for the release to NG-RAN.

The PDU Session Resource Release Command Transfer IE includes the following causes and their cause values:

PDU Session Resource Release Command Transfer IE Causes and Cause Values
Cause Cause Value

Details

NAS

Normal Release

SMF includes this cause for the UE-initiated PDU Session release.

Deregister

SMF includes this cause for the UDM-initiated PDU Session release.

Radio Network Layer

Release due to 5GC generated reason

SMF includes this cause for both the network-initiated PDU Session release and the internal failure cases.

Note

For all the preceding cause values, SMF maintains an N2 cause-based statistics in the N2 message type.