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TS 29.413
Application of the NG Application Protocol (NGAP)
to non-3GPP Access

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V16.0.0 (PDF)2020/06  13 p.
V15.4.02020/06  12 p.
Rapporteur:
Mr. Xu, Steven

Content for  TS 29.413  Word version:  16.0.0

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1  ScopeWord‑p. 5
The present document describes the applicability of NG Application Protocol (NGAP) messages and procedures, defined in TS 38.413, to non-3GPP access. A general description for non-3GPP access can be found in TS 23.501, TS 23.502, and TS 23.316.
2  References
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]  TR 21.905   "Vocabulary for 3GPP Specifications".
[2]  TS 38.413   "NG-RAN; NG Application Protocol (NGAP)".
[3]  TS 23.501   "System Architecture for the 5G System".
[4]  TS 23.502   "Procedures for the 5G System".
[5]  TS 33.501   "Security architecture and procedures for 5G system".
[6]  TS 23.316   "Wireless and wireline convergence access support for the 5G System (5GS)".
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3  Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
5G-RG
5G Residential Gateway
FN-RG
Fixed Network Residential Gateway
N3IWF
Non-3GPP InterWorking Function
TNAP
Trusted Non-3GPP Access Point
TNGF
Trusted Non-3GPP Gateway Function
TWIF
Trusted WLAN Interworking Function
W-AGF
Wireline Access Gateway Function
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4  Principles for the use of NGAP for non-3GPP access
4.1  General
TS 23.501, Clause 501 [3] specifies the NGAP used between the Non-3GPP access network node and the AMF. The Non-3GPP access network node is either a Non-3GPP InterWorking Function (N3IWF), or a Trusted Non-3GPP Gateway Function (TNGF), or a Trusted WLAN Interworking Function (TWIF), or a Wireline Access Gateway Function (W-AGF). NGAP is used as specified in TS 38.413 [2] with clarifications or additions as specified in Clause 5.
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5  Non-3GPP access
5.1  Use of the NGAP for non-3GPP access
The following NGAP procedures are used between the Non-3GPP access network node and the AMF:
  • PDU Session Management Procedures
    • PDU Session Resource Setup
    • PDU Session Resource Release
    • PDU Session Resource Modify
    • PDU Session Resource Notify
  • UE Context Management Procedures
    • Initial Context Setup
    • UE Context Release Request
    • UE Context Release
    • UE Context Modification
  • Transport of NAS Messages Procedures
    • Initial UE Message
    • Downlink NAS Transport
    • Uplink NAS Transport
    • NAS Non Delivery Indication
    • Reroute NAS Request
  • Interface Management Procedures
    • NG Setup
    • RAN Configuration Update
    • AMF Configuration Update
    • NG Reset
    • Error Indication
    • AMF Status Indication
    • Overload Start
    • Overload Stop
  • UE TNLA Binding Procedures
    • UE TNLA Binding Release
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.
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5.2  NGAP messages used for non-3GPP accessWord‑p. 6
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.
  • PDU SESSION RESOURCE SETUP REQUEST
  • PDU SESSION RESOURCE SETUP RESPONSE
  • PDU SESSION RESOURCE RELEASE COMMAND
  • PDU SESSION RESOURCE RELEASE RESPONSE
  • PDU SESSION RESOURCE MODIFY REQUEST
  • PDU SESSION RESOURCE MODIFY RESPONSE
  • PDU SESSION RESOURCE NOTIFY
  • INITIAL CONTEXT SETUP REQUEST
  • INITIAL CONTEXT SETUP RESPONSE
  • INITIAL CONTEXT SETUP FAILURE
  • UE CONTEXT RELEASE REQUEST
  • UE CONTEXT RELEASE COMMAND
  • UE CONTEXT RELEASE COMPLETE
  • UE CONTEXT MODIFICATION REQUEST
  • UE CONTEXT MODIFICATION RESPONSE
  • UE CONTEXT MODIFICATION FAILURE
  • INITIAL UE MESSAGE
  • DOWNLINK NAS TRANSPORT
  • UPLINK NAS TRANSPORT
  • NAS NON DELIVERY INDICATION
  • REROUTE NAS REQUEST
  • NG SETUP REQUEST
  • NG SETUP RESPONSE
  • NG SETUP FAILURE
  • RAN CONFIGURATION UPDATE
  • RAN CONFIGURATION UPDATE ACKNOWLEDGE
  • RAN CONFIGURATION UPDATE FAILURE
  • AMF CONFIGURATION UPDATE
  • AMF CONFIGURATION UPDATE ACKNOWLEDGE
  • AMF CONFIGURATION UPDATE FAILURE
  • NG RESET
  • NG RESET ACKNOWLEDGE
  • ERROR INDICATION
  • AMF STATUS INDICATION
  • OVERLOAD START
  • OVERLOAD STOP
  • UE TNLA BINDING RELEASE REQUEST
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5.3  Exceptions for NGAP message contents and information element coding when used for non-3GPP accessWord‑p. 8
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:
  • the following IEs shall be ignored, when received:
    • RAN Paging Priority IE
    • 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).
PDU SESSION RESOURCE RELEASE COMMAND message:
  • the following IEs shall be ignored, when received:
    • RAN Paging Priority IE
PDU SESSION RESOURCE MODIFY REQUEST message:
  • the following IEs shall be ignored, when received:
    • RAN Paging Priority IE
INITIAL CONTEXT SETUP REQUEST message:
  • the following IEs shall be ignored, when received:
    • Core Network Assistance Information IE
    • Trace Activation IE
    • MobilityRestriction List IE
    • UE Radio Capability IE
    • Index to RAT/Frequency Selection Priority IE
    • Emergency Fallback Indicator IE
    • RRC Inactive Transition Report Request IE
    • UE Radio Capability for Paging IE
    • 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)
    • 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 RELEASE COMPLETE message:
  • the following IEs shall be ignored, when received:
    • Information on Recommended Cells and RAN Nodes for Paging IE
UE CONTEXT MODIFICATION REQUEST message:
  • the following IEs shall be ignored, when received:
    • RAN Paging Priority IE
    • Index to RAT/Frequency Selection Priority IE
    • Core Network Assistance Information IE
    • Emergency Fallback Indicator IE
    • RRC Inactive Transition Report Request IE
    • 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)
  • 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
UE CONTEXT MODIFICATION RESPONSE message:
  • the following IEs shall be ignored, when received:
    • RRC State IE
INITIAL UE MESSAGE message:
  • RRC Establishment Cause IE: the information given within this IE is to indicate the establishment cause as specified in TS 23.502.
  • 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.
  • 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.
  • 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:
  • the following IEs shall be ignored, when received:
    • RAN Paging Priority IE
    • MobilityRestriction List IE
    • Index to RAT/Frequency Selection Priority IE
UPLINK NAS TRANSPORT message:
  • 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.
  • 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.
  • 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:
  • the following IEs shall be ignored, when received:
    • Default Paging DRX IE
RAN CONFIGURATION UPDATE message:
  • the following IEs shall be ignored, when received:
    • Default Paging DRX IE
The Global RAN Node ID IE in the applicable NGAP messages includes the following IEs as specified in TS 38.413:
  • Global N3IWF ID IE for the untrusted non-3GPP access.
  • Global TNGF ID IE for the trusted non-3GPP access.
  • Global TWIF ID IE for the trusted WLAN access.
  • 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:
  • IP address IE and port number IE for the untrusted non-3GPP access.
  • TNGF User Location Information IE for the trusted non-3GPP access.
  • TWIF User Location Information IE for the trusted WLAN access.
  • 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.
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5.4  Handling of NGAP messages not specified to be applicable between the N3IWF and AMFWord‑p. 9
If the Non-3GPP access network node or the AMF receive an NGAP message not listed in section 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.
$  Change HistoryWord‑p. 10

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