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NAS 5G SMF to UE via AMF 3GPP TS 24.501

5G NAS - PDU Session Authentication Result

PDU Session Authentication Result is the 5GSM message the SMF sends to indicate a successful outcome of PDU session authentication, and it can also carry an EAP-success when external DN authentication is used.

Message Fact Sheet

Protocol nas Network 5g
Spec 3GPP TS 24.501 Spec Section 8.3.6
Direction SMF to UE via AMF Message Type 5GSM signaling
Full message name 5G NAS - PDU Session Authentication Result
Protocol NAS
Technology 5G
Direction SMF to UE via AMF
Interface N1
Signaling bearer / channel NAS signaling / Usually carried inside DL NAS Transport on the access side
Typical trigger The UE completed the PDU session authentication exchange successfully, or the external DN returned a successful EAP result.
Main purpose Confirms that the PDU session authentication branch completed successfully and, when needed, returns the final EAP success payload to the UE.
Main specification 3GPP TS 24.501, 8.3.6
Release added Release 15
Procedures where used 5G PDU Session Establishment, 5G PDU Session Authentication Procedure, PDU EAP message reliable transport procedure

What is PDU Session Authentication Result in simple terms?

PDU Session Authentication Result is the 5GSM message the SMF sends to indicate a successful outcome of PDU session authentication, and it can also carry an EAP-success when external DN authentication is used.

Confirms that the PDU session authentication branch completed successfully and, when needed, returns the final EAP success payload to the UE.

Where this message appears in the call flow

5G PDU Session Authentication Procedure

Call flow position: Network success indication step that finalizes the authentication branch after the UE response is accepted.

Typical state: The UE has already answered the authentication challenge and is waiting for the network's successful result or final session outcome.

Preconditions:

  • The UE sent PDU Session Authentication Complete.
  • The EAP exchange or local authentication decision succeeded.

Next likely message: PDU Session Establishment Accept or PDU Session Release Command

5G PDU Session Establishment

Call flow position: Optional success branch inside the larger establishment procedure before the final session outcome is delivered.

Typical state: The UE is still waiting for the session to be completed or rejected after session-level authentication.

Preconditions:

  • The request reached the SMF.
  • The authentication branch was selected for the requested PDU session.

Next likely message: PDU Session Establishment Accept

Call flow position

Previous message(s): PDU Session Authentication Complete, DL NAS Transport

Next message(s): PDU Session Establishment Accept, PDU Session Establishment Reject, PDU Session Release Command

Message direction and transport

Sender and receiver: SMF to UE via AMF

Interface: N1

Domain: Core-side session management response with access-side NAS delivery dependency

Signaling bearer: NAS signaling

Logical channel: Usually carried inside DL NAS Transport on the access side

Transport / encapsulation: 5GSM NAS message transported end-to-end from the SMF to the UE through AMF mediation

Security context: Normally sent after registration and NAS security establishment, so the payload is typically integrity protected and often ciphered.

ASN.1 Message Syntax for 5G NAS - PDU Session Authentication Result

This message is not typically analyzed as ASN.1 on the wire. It is usually read as a NAS or protocol field structure instead.

This is a 5GSM NAS message defined by ordered information elements in 3GPP TS 24.501 rather than ASN.1 syntax.

5G NAS - PDU Session Authentication Result - Example Dump

PDU Session Authentication Result
  Extended Protocol Discriminator: 5G Session Management
  PDU Session ID: 10
  PTI: No procedure transaction identity assigned
  Message Type: PDU Session Authentication Result
  EAP Message:
    Code: Success
    Identifier: 7
    Data: [authentication complete]
  Extended Protocol Configuration Options:
    DNS IPv4 address: 10.1.1.1
    DNS IPv6 address: 2001:db8::53

Related message pages

5G NAS - PDU Session Authentication CommandPDU Session Authentication Command is the 5GSM message that carries an EAP request from the SMF to the UE when session-level authentication or authorization is required.5G NAS - PDU Session Authentication CompletePDU Session Authentication Complete is the 5GSM message the UE sends in response to PDU Session Authentication Command to carry the EAP response and continue the session-authentication exchange.5G NAS - PDU Session Establishment AcceptPDU Session Establishment Accept is the 5GSM success message the network sends after it creates the requested PDU session and returns the final session parameters, address, and QoS context.5G NAS - PDU Session Establishment RejectPDU Session Establishment Reject is the 5GSM failure response the network sends when the requested PDU session cannot be created and the UE needs the rejection reason.5G NAS - DL NAS TransportDL NAS Transport is the NAS wrapper message the network uses to deliver a payload downward to the UE when the procedure needs to carry additional content transparently through NAS.5G NAS - UL NAS TransportUL NAS Transport is the NAS wrapper message the UE uses to send a payload upward toward the core when the NAS procedure needs to carry additional information transparently.

Related Procedures

Related Tools

Use This Reference in Practice

Decode this message with the 3GPP Decoder, inspect the related message database, or open the matching call flow to see where this signaling step fits in the full procedure.