Base Station (BS)

A base station is the radio infrastructure that connects mobile devices to a cellular network, termed BTS in 2G GSM, Node B in 3G UMTS, eNodeB in 4G LTE, and gNB in 5G. Each generation defines distinct interfaces to the core (Abis, Iub, S1, NG) and progressively richer security capabilities including air-interface ciphering, integrity protection, and mutual authentication.

Categories: Radio Access NetworkCore NetworkSignaling

Base Station (BS) 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 Base Station (BS) in the wider telecom-security picture, review 5G SA, AMF, Capacity Planning, CAPEX, CSCF and Diameter — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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