Fujitsu Unveils Sustainable 5G vRAN

Fujitsu has successfully developed new software virtualized radio access network (vRAN) technology with support for 5G Standalone (SA) and will offer it for verification by telecommunications carriers from March 2022.

By leveraging Fujitsu's AI and quantum-inspired "Digital Annealer" technologies to optimize computing resources, the newly developed vRAN technology addresses one of the key challenges of conventional vRANs, delivering high-performance with low-energy consumption. Fujitsu estimates that this approach offers the potential to reduce overall system CO2 emissions by 50% or more compared to conventional base station systems by 2025, while offering users high-quality, stable communications.

CO2 emission reduction of the entire system using this vRAN

Moving forward, Fujitsu plans to deploy this vRAN technology globally, offering robust and innovative support to telecommunications carriers working to reduce their carbon footprint, and ultimately contribute to the realization of a more sustainable society. Learn more about this at MWC Barcelona 2022 at Fujitsu's Booth 2G60 from February 28, 2022 to March 3, 2022.

In recent years, advances including performance improvements in general-purpose CPUs and the virtualization of wireless signal processing and control technology (telecom function) have opened an exciting wide range of new possibilities for technological innovation in communications, including the appearance of vRAN technology. The introduction of vRANs composed of general-purpose servers, which don't require the costly development of specialized hardware, is currently drawing attention as an attractive alternative to conventional base stations.

Despite their promise, existing vRAN technology continues to face barriers to wider adoption. For instance, vRANs that are not configured with dedicated equipment tend to have lower performance efficiency than conventional base stations. To maintain the same performance, more hardware must be built in, resulting in higher environmental loads in areas like power consumption. In terms of stability and redundancy, there have also been cases in which conventional vRANs cannot sufficiently guarantee carrier-grade communication quality.

Features of Fujitsu's vRAN

Fujitsu's new vRAN technology supports 5G SA and conforms to O-RAN specifications, while leveraging the following proprietary technologies to successfully solve some of the challenges surrounding conventional vRANs. By optimizing the entire 5G wireless network and reducing the amount of equipment and power consumption, Fujitsu's vRAN offers the potential to contribute to significant reductions in the total CO2 emissions throughout carriers' 5G wireless systems.

1. Fujitsu's customization approach for high-performance, high-capacity communications

Improved software control methods for high performance and capacity in communications. Increase communication speed and communication coverage area from two to four times.

2. Dynamic resource allocation technology

Fujitsu has developed its own dynamic resource allocation technology that reduces excess resources and power consumption by making it possible to flexibly adjust the computing resources of servers needed for operations according to the usage status (traffic volume) of base stations, which varies with region and time of day. By linking the RAN intelligent control unit (RIC)(3), and SMO(4) which orchestrates and manages the entire network, with this technology, mobile phone users' movements and application usage are estimated and optimal resource allocation is achieved.

3. Automatic cell re-design technology

In addition to using AI to predict future traffic fluctuations, this system leverages Fujitsu's quantum-inspired Digital Annealer computing technology to enable optimal allocation of computing resources by rapidly solving problems that are difficult to solve with today's general-purpose computers. By using the superior combinatorial optimization capabilities of the Digital Annealer, it is possible to derive the optimal connection destinations from the various combinations of radio units (RU) and vRANs (Central Unit / Distributed Unit) in environments where radio waves from many base stations overlap.

Future plans

In March 2022, Fujitsu will begin providing software that runs on general-purpose servers for carrier verification, and will support various types of verification, including field testing. By the end of fiscal 2022, Fujitsu plans to start offering this technology as a service on a global basis, with the aim of expanding it to the commercial service networks of each carrier.

Its goal is to reduce total CO2 emissions by 50% or more by 2025, compared to conventional base station systems, by successively updating software functions and further improving technologies to reduce environmental impact.

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