RANsemi, TechPhosis integrate open source 5G stack for small cells

RANsemi and TechPhosis said Tuesday they have combined the Linux Foundation’s OCUDU CU/DU software with RANsemi’s RNS802 baseband PHY through the Small Cell Forum FAPI interface. The integration is designed to make low-power, compact 5G integrated small cells easier to deploy while showing that open source software can work with commercial PHY hardware.

Why it matters: - The integration points to a practical route for low-SWaP 5G small cells that combine open source CU/DU software with commercial PHY hardware. - The work could give operators and developers more flexibility in how they build compact 5G infrastructure. - The same software approach is designed to support both integrated small cells and O-RAN-style deployments. - The use cases include private networks, mission-critical communications and defence-related wireless infrastructure.

What happened: - RANsemi Limited and TechPhosis Private Limited integrated the Linux Foundation’s open source 5G OCUDU CU/DU software stack with the RANsemi RNS802 baseband PHY. - The companies used the Small Cell Forum FAPI interface to connect the software stack and PHY. - The integration was announced Tuesday, June 23, 2026, from Bristol, UK, and Gurugram, India. - The demonstration used an RNS802 development platform to create a complete 5G gNB architecture.

The details: - OCUDU stands for Open Centralized Unit / Distributed Unit. - OCUDU is hosted by the Linux Foundation and designed for commercial deployment in 5G and future wireless networks. - TechPhosis provided deep RAN L2/L3 and systems integration expertise to connect the open source software with deployable infrastructure. - The result validates an open source approach for integrated small cell deployments. - The collaboration builds on a November 2025 announcement on an Integrated Small Cell Starter Kit. - The same OCUDU-based approach can extend to O-RAN 7.2 architectures using the RANsemi RNS805 O-RU SoC. - The partners say that gives developers a single software approach across integrated and disaggregated deployment options. - RANsemi said open source software and standards-based interoperability are becoming increasingly important in wireless infrastructure. - TechPhosis said customers need enhancements, integration and support to move from open source software to deployable networks. - More information is available in the companies’ contact pages: RANsemi contact page and TechPhosis contact page. - OCUDU project information is available at ocudu.org.

Between the lines: - The announcement is about more than a technical demo. It shows how open source RAN software can move from reference stacks toward commercial products. - The FAPI-based integration matters because standards-based interfaces reduce lock-in and make mixed-vendor deployments more realistic. - The message is aimed at buyers that want smaller, lower-power 5G systems without giving up interoperability.

What's next: - RANsemi and TechPhosis are positioning the architecture for broader use in private 5G, mission-critical and defence markets. - The companies are likely to continue extending the same software model across additional deployment types and hardware platforms. - Developers interested in the effort can contact RANsemi or TechPhosis through the links provided above.