N4 Association Setup Procedure Call Flow
The N4 Association Setup procedure creates the N4 association between the SMF and the UPF, which enables the SMF to use the UPF resources to establish N4 sessions. The N4 association setup procedure involves the following steps:
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The UPF initiates the procedure by sending N4 Association Setup Request to the SMF.
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The SMF sends an N4 Association Setup Response after it receives the request from the UPF.
The following call flow describes the UPF-initiated N4 Association Setup procedure:
The UPF sends the following PFCP Association Setup Request:
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Node ID (UPF).
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Supported optional features in UPF. The UPF supports F-TEID allocation and release, sending of End Marker, and so on.