April 2019
Intermediate to advanced
520 pages
17h 3m
English
Content preview from 5G for the Connected World
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Appendix of 3GPP Reference Points
The list contains reference points and service‐based interfaces applicable to the 5G System.
| Cx | Reference point between CSCF and HSS/UDM based on Diameter. |
| E1 | Reference point between CU‐CP and CU‐UP (Central Unit) to control user plane resources. E1 is based on E1AP (E1 Application Part). |
| F1 | Reference point between RAN DU (Distributed Unit) and RAN CU (Central Unit). It consists of F1‐C and F1‐U to exchange control and user plane traffic respectively. F1 is based on F1AP (F1 Application Part). |
| N1 | Reference point between UE and AMF to exchange NAS (Non‐Access Stratum) messages. |
| N2 | Reference point between 5G‐RAN and AMF based on NGAP (Next Generation Application Part). |
| N3 | Reference point between 5G RAN and UPF based on GTPv1‐U (GPRS Tunneling Protocol User Plane). |
| N4 | Reference point between SMF and UPF to manage data sessions at the user plane. N4 is based on PFCP (Packet Forwarding Control Protocol). |
| N5 | Reference point between PCF and AF. |
| N6 | Reference point between UPF and packet data networks. It can, e.g. transport IP and Ethernet packets. |
| N7 | Reference point between SMF and PCF. |
| N8 | Reference point between AMF and UDM. |
| N9 | Reference point between two UPF to transmit user plane data. It is based on GTPv1‐U. |
| N10 | Reference point between SMF and UDM. |
| N11 | Reference point between AMF and SMF. |
| N12 | Reference point between AMF and AUSF. |
| N13 | Reference point between AUSF and UDM. |
| N14 | Reference point between two AMF. |
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