5G SBA (5G Service-Based Architecture)

The modern 5G core network design using microservices and HTTP/2-based APIs instead of point-to-point connections. 5G SBA separates control plane from user plane and introduces Network Functions (NFs) that communicate through standardized service interfaces. SBA security requires OAuth2 authentication, mutual TLS, and API-level access controls.

Categories: Core NetworkSignalingSecurity Controls

5G SBA in context

The mobile core carries subscriber sessions, mobility and policy. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF.

Signaling protocols carry the control-plane messages that set up calls, register subscribers and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA as top-tier telecom risk.

To place 5G SBA in the wider telecom-security picture, review ACL, Core Network Security Assessment, IETF, Network Exposure Function (NEF), RSA and Signaling IDS — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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