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 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.

Signaling protocols carry the control-plane instructions that set up calls, register subscribers, hand over sessions 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 FS.11 / FS.19 / FS.20 as a top-tier telecom risk.

To place Cloud RAN in the wider telecom-security picture, review CU/DU/RU Split, Fronthaul, RRH, User Plane Security, Base Station (BS) and Capacity Planning.

Related terms

Equipment

O-RAN units and RIC (O-RU, O-DU, O-CU, RIC, SMO)

Articles in the P1 mobile network security guide

Related topic hubs

  • SS7 Security SS7/MAP/CAP/SCCP attacks and defenses across 2G/3G interconnect.
  • Signaling Firewall Unified SS7/Diameter/GTP/SMS signaling firewall framework.

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.