The open RAN movement has come a long way in just a couple of years, surprising both proponents and skeptics. With early adopters embracing the openness concept and open RAN now on track to account for more than 5% of global RAN revenues in 2022, the early majority operator wants to understand if open RAN can deliver the same performance and total cost of ownership (TCO) as proprietary RAN. Or even better, can open RAN improve the TCO? And if so, how can open RAN save money or introduce cost efficiencies if the RAN is just a small part of the overall TCO?
Based on our quarterly tracking of the broader mobile infrastructure market and telecom capex, we estimate RAN accounted for nearly a fourth of total wireless capex in 2021. This ratio was averaging closer to a fifth in the LTE era. But it is trending upward due to a confluence of factors. The reality is that cement, steel, services, and other equipment in aggregate are driving the majority of the capex. Meanwhile, cumulative site opex to support recurring costs such as transport and site leases, electricity, O&M, and other services are collectively fairly comparable in size to the capex component. Consequently, we estimate that RAN as a share of the combined capex and site opex is in the 10% to 15% range on average.
Can O-RAN compatible radios introduce any cost savings?
Factoring in the volume-discount sensitivity rates and conversations with a variety of participants in the RAN ecosystem, we believe it is unlikely that the 7.2x radio BOM will be smaller than the non-O-RAN compliant radio BOM with similar functional splits. Short-term and long-term cost savings are still possible, but they will be more driven by margin reductions than BOM savings.
Open RAN using traditional baseband does not change the DU cost structure much relative to proprietary RAN solutions (assuming all else equal), however Open vRAN based implementations do change the economics. Not surprisingly, the direct cost synergies with vRAN are at this juncture limited at best. If anything, there is still an expectation that the baseband portion relying on general purpose processors (GPPs) or hybrid GPP and accelerator line card combos will increase the RAN compute costs relative to purpose-built baseband. This gap was rather significant just a few years ago – some of the equipment vendors estimate it was closer to 10x in the 4G era (operators have also been open about the cost and energy benefits with ASICs).
This cost gap is now shrinking. New silicon solutions and accelerators, such as the ones announced by Intel, Marvell and Qualcomm, are promising cost (and performance) parity with purpose-built RAN. Since it is early days from a vRAN perspective with virtual RAN comprising a single digit share of the broader RAN market, operators are still learning about the tradeoffs.
In order for open RAN to reach a broader audience, the architecture needs to deliver comparable or better TCO than proprietary and purpose-built RAN. (Article Cover Image - Getty Images)