{"ID":5937041,"CreatedAt":"2026-07-07T03:14:33.014478982Z","UpdatedAt":"2026-07-09T14:17:21.672613853Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2607.05146","arxiv_id":"2607.05146","title":"A Modular O-RAN Testbed Based on SRS Open Source O-CU/O-DU and Massive Beams Modular O-RU","abstract":"In this paper, we present a modular open radio access network (O-RAN) consisting of the 5G Core, a central (O-CU) and distributed unit (O-DU) by Software Radio Systems (SRS) and an O-RAN radio unit (O-RU), MODRAD-SC, by Massive Beams (MB). OCUDU provides an open source 5G-compliant O-CU and O-DU solution developed by SRS, while MB's radio unit is a fully O-RAN compliant category A O-RU. According to O-RAN split 7.2a, OCUDU performs higher layer functions up to the high physical (PHY) layer, while the O-RU handles low PHY and RF functions. This results in an O-RAN-compliant 5G gNodeB. In an alternative configuration, OCUDU and MODRAD-SC operate in a software-defined radio fashion corresponding to split 8, facilitating non-real-time experiments among others. In both cases, the system provides full control over O-CU, O-DU, and O-RU. In addition, we will discuss the possibility to attach an analog beamformer to the O-RU, enabling hybrid digital-analog beamforming. The flexibility and modularity offered by OCUDU and MODRAD-SC enable the practical realization of a multitude of applications, ranging from 5G demonstrators to pre-6G experiments. The system addresses the requirements of academia and industry and is well-suited as an easy-to-use platform for experimental and practical deployments.","short_abstract":"In this paper, we present a modular open radio access network (O-RAN) consisting of the 5G Core, a central (O-CU) and distributed unit (O-DU) by Software Radio Systems (SRS) and an O-RAN radio unit (O-RU), MODRAD-SC, by Massive Beams (MB). OCUDU provides an open source 5G-compliant O-CU and O-DU solution developed by S...","url_abs":"https://arxiv.org/abs/2607.05146","url_pdf":"https://arxiv.org/pdf/2607.05146v1","authors":"[\"Fabian Göttsch\",\"Oriol Font-Bach\",\"Andreas Benzin\",\"Dennis Osterland\",\"Andre Puschmann\",\"Felix-Christopher Lutz\",\"Wilhelm Keusgen\",\"Giuseppe Caire\"]","published":"2026-07-06T14:27:56Z","proceeding":"cs.NI","tasks":"[\"cs.NI\",\"eess.SP\"]","methods":"[]","has_code":false}