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+Glossary
+========
+
+Protocols
+---------
+- NGAP
+- S1AP
+- Diameter
+- NAS
+- PFCP
+- GTPv1
+- GTPv2
+
+Network Functions
+-----------------
+
+- AMF: Access Management Function
+- UPF: User Plane Function
+- SMF: Session Management Function
+- NRF: Network Repository Function
+- NSSF: Network Slice Selection Function
+- PCF: Policy & Charging Function
+- AUSF: Authentication Function
+- UDM: Unified Data Management Function
+- UDR: Unified Data Repository Function
+
+3gpp Interfaces
+---------------
+- N4 : SMF to UPF
+- SBI interface