The following NGAP procedures are used between the Non-3GPP access network node and the AMF:
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PDU Session Management Procedures
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PDU Session Resource Setup
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PDU Session Resource Release
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PDU Session Resource Modify
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PDU Session Resource Notify
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UE Context Management Procedures
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Initial Context Setup
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UE Context Release Request
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UE Context Release
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UE Context Modification
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Transport of NAS Messages Procedures
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Initial UE Message
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Downlink NAS Transport
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Uplink NAS Transport
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NAS Non Delivery Indication
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Reroute NAS Request
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Interface Management Procedures
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NG Setup
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RAN Configuration Update
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AMF Configuration Update
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NG Reset
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Error Indication
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AMF Status Indication
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Overload Start
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Overload Stop
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UE TNLA Binding Procedures
For the NGAP procedures used between the Non-3GPP access network node and the AMF, the Non-3GPP access network node fulfils the behaviour of the NG-RAN node as specified in
clause 8 of TS 38.413, with clarifications as specified in
Clause 5.3. The text in
clause 8 of TS 38.413 referring to Uu should be understood as referring to the Y2 reference point as specified in
TS 23.501.
The list given below shows the NGAP messages, as specified in
TS 38.413 subclause 9.2 (tabular format) and 9.4
(ASN.1 notation) that are used between the Non-3GPP access network node and the AMF.
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PDU SESSION RESOURCE SETUP REQUEST
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PDU SESSION RESOURCE SETUP RESPONSE
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PDU SESSION RESOURCE RELEASE COMMAND
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PDU SESSION RESOURCE RELEASE RESPONSE
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PDU SESSION RESOURCE MODIFY REQUEST
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PDU SESSION RESOURCE MODIFY RESPONSE
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PDU SESSION RESOURCE NOTIFY
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INITIAL CONTEXT SETUP REQUEST
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INITIAL CONTEXT SETUP RESPONSE
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INITIAL CONTEXT SETUP FAILURE
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UE CONTEXT RELEASE REQUEST
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UE CONTEXT RELEASE COMMAND
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UE CONTEXT RELEASE COMPLETE
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UE CONTEXT MODIFICATION REQUEST
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UE CONTEXT MODIFICATION RESPONSE
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UE CONTEXT MODIFICATION FAILURE
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INITIAL UE MESSAGE
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DOWNLINK NAS TRANSPORT
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UPLINK NAS TRANSPORT
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NAS NON DELIVERY INDICATION
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REROUTE NAS REQUEST
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NG SETUP REQUEST
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NG SETUP RESPONSE
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NG SETUP FAILURE
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RAN CONFIGURATION UPDATE
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RAN CONFIGURATION UPDATE ACKNOWLEDGE
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RAN CONFIGURATION UPDATE FAILURE
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AMF CONFIGURATION UPDATE
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AMF CONFIGURATION UPDATE ACKNOWLEDGE
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AMF CONFIGURATION UPDATE FAILURE
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NG RESET
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NG RESET ACKNOWLEDGE
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ERROR INDICATION
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AMF STATUS INDICATION
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OVERLOAD START
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OVERLOAD STOP
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UE TNLA BINDING RELEASE REQUEST
For the NGAP messages transferred between the Non-3GPP access network node and the AMF, the following exceptions to the specification in
TS 38.413 shall be applied:
PDU SESSION RESOURCE SETUP REQUEST message:
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the following IEs shall be ignored, when received:
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RAN Paging Priority IE
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UE Aggregate Maximum Bit Rate IE (except for non-trusted non-3GPP access, trusted non-3GPP access and trusted WLAN access as specified in TS 23.501).
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Notification Control IE included in the QoS Flow Level QoS Parameters IE
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Alternative QoS Parameters Set List IE included in the QoS Flow Level QoS Parameters IE
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UE Slice Maximum Bit Rate List IE
PDU SESSION RESOURCE RELEASE COMMAND message:
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the following IEs shall be ignored, when received:
PDU SESSION RESOURCE MODIFY REQUEST message:
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the following IEs shall be ignored, when received:
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RAN Paging Priority IE
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Notification Control IE included in the QoS Flow Level QoS Parameters IE
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Alternative QoS Parameters Set List IE included in the QoS Flow Level QoS Parameters IE
INITIAL CONTEXT SETUP REQUEST message:
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the following IEs shall be ignored, when received:
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Core Network Assistance Information for RRC INACTIVE IE
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Trace Activation IE
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Mobility Restriction List IE
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UE Radio Capability IE
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Index to RAT/Frequency Selection Priority IE
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Emergency Fallback Indicator IE
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RRC Inactive Transition Report Request IE
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UE Radio Capability for Paging IE
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Redirection for Voice EPS Fallback IE
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Location Reporting Request Type IE
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CN Assisted RAN Parameters Tuning IE
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SRVCC Operation Possible IE
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IAB Authorized IE
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Enhanced Coverage Restriction IE
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Extended Connected Time IE
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UE Differentiation Information IE
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NR V2X Services Authorized IE
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LTE V2X Services Authorized IE
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NR UE Sidelink Aggregate Maximum Bit Rate IE
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LTE UE Sidelink Aggregate Maximum Bit Rate IE
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PC5 QoS Parameters IE
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CE-mode-B Restricted IE
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UE User Plane CIoT Support Indicator IE
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Management Based MDT PLMN List IE
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UE Radio Capability ID IE
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UE Aggregate Maximum Bit Rate IE (except for non-trusted non-3GPP access, trusted non-3GPP access and trusted WLAN access as specified in TS 23.501)
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UE Security Capabilities IE
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Time Synchronisation Assistance Information IE
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QMC Configuration Information IE
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Target NSSAI Information IE
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UE Slice Maximum Bit Rate List IE
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5G ProSe Authorized IE
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5G ProSe UE PC5 Aggregate Maximum Bit Rate IE
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5G ProSe PC5 QoS Parameters IE- RG Level Wireline Access Characteristics IE: the information given within this IE between the W-AGF and the AMF shall be stored in the UE context by the W-AGF as specified in TS 23.316.
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Notification Control IE included in the QoS Flow Level QoS Parameters IE
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Alternative QoS Parameters Set List IE included in the QoS Flow Level QoS Parameters IE
UE CONTEXT RELEASE COMPLETE message:
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the following IEs shall be ignored, when received:
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Information on Recommended Cells and RAN Nodes for Paging IE
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Paging Assistance Data for CE Capable UE IE
UE CONTEXT MODIFICATION REQUEST message:
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the following IEs shall be ignored, when received:
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RAN Paging Priority IE
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Index to RAT/Frequency Selection Priority IE
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Core Network Assistance Information IE
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Emergency Fallback Indicator IE
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RRC Inactive Transition Report Request IE
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CN Assisted RAN Parameters Tuning IE
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SRVCC Operation Possible IE
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IAB Authorized IE
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NR V2X Services Authorized IE
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LTE V2X Services Authorized IE
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NR UE Sidelink Aggregate Maximum Bit Rate IE
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LTE UE Sidelink Aggregate Maximum Bit Rate IE
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PC5 QoS Parameters IE
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UE Radio Capability ID IE
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UE Aggregate Maximum Bit Rate IE (except for non-trusted non-3GPP access, trusted non-3GPP access and trusted WLAN access as specified in TS 23.501)
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UE Security Capabilities IE
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Time Synchronisation Assistance Information IE
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QMC Configuration Information IE
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QMC Deactivation IE
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UE Slice Maximum Bit Rate List IE
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Management Based MDT PLMN Modification List IE
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5G ProSe Authorized IE
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5G ProSe UE PC5 Aggregate Maximum Bit Rate IE
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5G ProSe PC5 QoS Parameters IE
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if this is the first message received from a new AMF, the N3IWF shall identify the old AMF and the UE using the received RAN UE NGAP ID, release the UE-associated logical NG-connection to the old AMF and create a new UE-associated logical NG-connection to the new AMF.
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RG Level Wireline Access Characteristics IE: the information given within this IE between the W-AGF and the AMF shall be stored in the UE context by the W-AGF as specified in TS 23.316.
UE CONTEXT MODIFICATION RESPONSE message:
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the following IEs shall be ignored, when received:
INITIAL UE MESSAGE message:
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the following IEs shall be ignored, when received:
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IAB Node Indication IE
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CE-mode-B Support Indicator IE
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LTE-M Indication IE
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EDT Session IE
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NPN Access Information IE
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RedCap Indication IE
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RRC Establishment Cause IE: the information given within this IE is to indicate the Establishment cause for non-3GPP access as specified in TS 24.502.
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Selected PLMN Identity IE: the information given within this IE provides the selected PLMN ID for untrusted non-3GPP access as specified in TS 23.502.
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Authenticated Indication IE: the information given within this IE between the W-AGF and the AMF is to indicate that the FN-RG has been authenticated by the wireline 5G access network as specified in TS 23.316.
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Selected PLMN Identity IE: the information given within this IE contains the PLMN Identity for wireline access as specified in TS 23.316, or for trusted non-3GPP access as specified in TS 23.502.
DOWNLINK NAS TRANSPORT message:
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the following IEs shall be ignored, when received:
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RAN Paging Priority IE
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Mobility Restriction List IE
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Index to RAT/Frequency Selection Priority IE
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SRVCC Operation Possible IE
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Enhanced Coverage Restriction IE
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Extended Connected Time IE
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UE Differentiation Information IE
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CE-mode-B Restricted IE
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UE Radio Capability IE
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UE Capability Info Request IE
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End Indication IE
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UE Radio Capability ID IE
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UE Aggregate Maximum Bit Rate IE (except for non-trusted non-3GPP access, trusted non-3GPP access and trusted WLAN access as specified in TS 23.501)
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Target NSSAI Information IE
UPLINK NAS TRANSPORT message:
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TNGF Identity Information IE: the information given within this IE between the TNGF and the AMF contains a list of identifiers of NG-U terminations at TNGF as specified in TS 23.502.
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TWIF Identity Information IE: the information given within this IE between the TWIF and the AMF contains a list of identifiers of NG-U terminations at TWIF as specified in TS 23.502.
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W-AGF Identity Information IE: the information given within this IE between the W-AGF and the AMF contains a list of identifiers of NG-U terminations at W-AGF as specified in TS 23.316.
NG SETUP REQUEST message:
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the following IEs shall be ignored, when received:
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Default Paging DRX IE
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NB-IoT Default Paging DRX IE
NG SETUP RESPONSE message:
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the following IEs shall be ignored, when received:
RAN CONFIGURATION UPDATE message:
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the following IEs shall be ignored, when received:
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Default Paging DRX IE
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NB-IoT Default Paging DRX IE
OVERLOAD START message:
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AMF Overload Response IE: if the Overload Action IE is included, the contained information is used to identify the related signalling traffic corresponding to the Establishment cause for non-3GPP access as specified in TS 24.502.
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Slice Overload Response IE: if the Overload Action IE is included, the contained information is used to identify the related signalling traffic corresponding to the Establishment cause for non-3GPP access as specified in TS 24.502.
The Global RAN Node ID IE in the applicable NGAP messages includes the following IEs as specified in
TS 38.413:
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Global N3IWF ID IE for the untrusted non-3GPP access.
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Global TNGF ID IE for the trusted non-3GPP access.
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Global TWIF ID IE for the trusted WLAN access.
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Global W-AGF ID IE for the wireline 5G access.
The User Location Information IE in the applicable NGAP messages includes the following IEs as specified in
TS 38.413:
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IP address IE and port number IE for the untrusted non-3GPP access.
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TNGF User Location Information IE for the trusted non-3GPP access.
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TWIF User Location Information IE for the trusted WLAN access.
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W-AGF User Location Information IE for the wireline 5G access.
The Security Key IE in the applicable NGAP messages includes the K
N3IWF, or the K
TNGF, or the K
TWIF, or the K
WAGF as specified in
TS 33.501.
The RAN UE NGAP ID IE in the applicable NGAP messages identifies the UE association over the NG interface within the N3IWF node, or the TNGF node, or the TWIF node, or the W-AGF node, as specified in
TS 38.413.
If the Non-3GPP access network node or the AMF receive an NGAP message not listed in
clause 5.2 as being applicable between the Non-3GPP access network node and AMF, the receiving node shall act according to the criticality defined for the elementary procedure and ignore the message or discard the message and send an ERROR INDICATION message indicating that the procedure is not supported, as specified in in
TS 38.413.