Core Network

The central switching and routing infrastructure of a telecom network, distinct from the radio access network (RAN). 5G introduces Network Functions (NFs) in a service-based architecture.

Categories: Radio Access NetworkCore NetworkInternet and Routing

Core Network in context

The radio access network is where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations and downgrade attacks; defenses rest on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

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.

To place Core Network in the wider telecom-security picture, review A5/3, 5G, 5G SA, 5G NSA, AMF and AMPS — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.