TECHNOLOGY
CREDIT: ERICSSON
The architecture of mobile networks is undergoing a profound transformation over the course of a generation. For decades, the Radio Access Network( RAN), the collection of masts, radios and base stations that connect our devices to the network, was built on a closed, proprietary model. Now, a new paradigm, Open RAN, promises to dismantle the monolithic structure in favour of an open, interoperable and software-driven ecosystem.
Nowhere is the transition more visible or consequential than in the landmark collaboration between AT & T and Ericsson. The multi-billion-dollar initiative to re-architect a vast, live network is not merely a vendor contract; it is a real-world stress test of the promises and pragmatics of moving from the old world of traditional RAN to the new frontier of Open RAN.
The monolithic fortress: Understanding traditional RAN For decades, operators have built mobile networks using a vertically integrated, single-vendor model. In the traditional RAN architecture, one vendor supplies the key cell site components( the Baseband Unit( BBU), which handles signal processing and the Radio Unit( RU), which manages radio frequencies) as a tightly coupled, proprietary system.
The critical interface between these two components, known as the fronthaul, is closed. The design has profound consequences for network operators. A BBU from one vendor cannot communicate with an RU from another, creating significant operational and commercial challenges:
Vendor lock-in: Once an operator commits to a vendor for a geographic area, switching becomes prohibitively expensive and complex. It locks the operator into the pricing, innovation cycles and technological roadmap of a single supplier.
High costs: The reliance on specialised, purpose-built hardware comes at a premium. Without the economies
82 November 2025