RNC (Radio Network Controller)

The Radio Network Controller is the 3G UMTS element that controls a set of Node Bs. It handles radio resource management, soft handover, and air-interface ciphering and integrity. It connects to the core over Iu (Iu-CS to the MSC, Iu-PS to the SGSN), to Node Bs over Iub, and to other RNCs over Iur. The RNC is the 3G counterpart of the 2G BSC, and its functions are folded into the eNodeB in 4G.

Categories: Radio Access NetworkCore NetworkSignaling

RNC in context

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

The mobile core is where subscriber sessions, mobility and policy live. 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. Core exposure is the difference between a single-subscriber leak and a fleet-wide breach.

To place RNC in the wider telecom-security picture, review BSC, RANAP, UMTS, MSC, SGSN and Base Station (BS).

Related terms

Equipment

RAN controllers (BSC, RNC)

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