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What’s the difference between N2 and N3 interfaces in 5G, and which protocols ride on each?
N2 is the control-plane interface between the gNB and the AMF, carrying NGAP over SCTP for signalling such as registration and PDU-session setup. N3 is the user-plane interface between the gNB and the UPF, carrying user traffic in GTP-U tunnels over UDP. In short: N2 = control (NGAP/SCTP), N3 = data (GTP-U/UDP)…
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