S601: An NG-RG sends a PDU session establishment request message to a W-5GAN device.
Correspondingly, the W-5GAN device receives the PDU session establishment request message from the NG-RG.
Optionally, the PDU session establishment request message may include first virtual interface information. The first virtual interface information is used to represent a current service type of the NG-RG. For related descriptions of the first virtual interface information, refer to the foregoing authentication system part. Details are not described herein again.
S602: The W-5GAN device sends a fixed network interface message 1 to a 5G-AGF network element.
Correspondingly, the 5G-AGF network element receives the fixed network interface message 1 from the W-5GAN device.
The fixed network interface message 1 includes the PDU session establishment request message and newly added first link information, and the first link information is used to represent an access location of the NG-RG. For related descriptions of the first link information, refer to the foregoing authentication system part. Details are not described herein again.
S603: The 5G-AGF network element sends an NT message 1 to an AMF network element.
Correspondingly, the AMF network element receives the NT message 1 from the 5G-AGF network element. The NT message 1 includes the PDU session establishment request message and the first link information.
S604: The AMF network element sends a session management (SM) context creation request message to an SMF network element.
Correspondingly, the SMF network element receives the SM context creation request message from the AMF network element.