O-RU (O-RAN Radio Unit)
Also known as: O-RAN Radio Unit
The O-RU is the O-RAN Alliance's disaggregated Radio Unit that hosts the low-PHY, RF and antenna functions, and connects to the O-DU over the Open Fronthaul interface (CUS-Plane, M-Plane, S-Plane). Because the O-RU sits at the physical edge and often ships from a different vendor than the O-DU, supply-chain integrity, secure boot and Open Fronthaul authentication are central to O-RAN WG11 requirements.
Categories: Radio Access Network
O-RU 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.
To place O-RU in the wider telecom-security picture, review O-CU, O-DU, Open Fronthaul, O-Cloud, Cloud RAN and Fronthaul: each entry cross-references back to this page so you can walk the topic in either direction.
Related terms
Related topic hubs
- Diameter Security 4G/LTE Diameter threats across IPX/roaming and DEA defenses.
- Open RAN Security O-RAN xApp/rApp, E2/A1/O1 interfaces and RIC security.
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.