Cloud RAN

Cloud RAN, often called C-RAN, centralises baseband units in a regional data centre and connects them to remote radio heads via a high-bandwidth, low-latency fronthaul (CPRI or eCPRI). It enables coordinated multi-cell processing, easier upgrades, and elastic capacity. Security implications include the need to protect the fronthaul itself (which carries unciphered traffic in some splits), to harden the cloud platform, and to ensure timing and key material handling meet the stringent requirements of the radio interface.

Categories: Radio Access NetworkSignalingCloud and Virtualization

Cloud RAN 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.

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 Cloud RAN in the wider telecom-security picture, review 1G, 5G SA, AMF, Base Station (BS), BTS Impersonation (Fake BTS) and Capacity Planning — 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.