5G • Core Network
N11 Interface
N11 Reference Point (AMF to SMF)
Interface between AMF and SMF coordinating session establishment and user plane activation.
Technical Explanation
Realized via the Nsmf service-based interface, N11 connects the mobility management layer (AMF) to the session management layer (SMF). AMF routes NAS Session Management messages across N11, and SMF returns N2 radio bearer setup requests for the gNodeB.
Key Functions
- Routes NAS Session Management messages between AMF and SMF
- Triggers user plane radio bearer establishment in the RAN via N2
- Realized via Nsmf_PDUSession service-based interface
Specifications
3GPP TS 23.501, TS 29.502
Interfaces
N11Nsmf
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