# Duranta - OpenAirInterface Duranta OpenAirInterface RAN delivers and maintains an open-source cellular wireless software stack for 4G, 5G and future networking technologies. It supports simulation, prototyping, and end-to-end deployments on Commercial-Off-The-Shelf (COTS) hardware. Built for research and experimentation, it provides standard-compliant interfaces and is released under the Collaborative Standards Software License (CSSL). ## License * [OAI License Model](http://www.openairinterface.org/?page_id=101) * [CSSL v1.0](http://www.openairinterface.org/?page_id=698) The source code is distributed under [**CSSL v1.0**](LICENSE). Some files, such as for orchestration, are distributed under [MIT license](./LICENSES/preferred/MIT.txt). Documentation is distributed under [Creative Commons Attribution 4.0 International license](LICENSES/preferred/CC-BY-4.0.txt). All the files without an explicit copyright header have an implicit "Copyright of OpenAirInterface Authors". Please see [NOTICE](NOTICE) for other licenses which are used in the software. In the past OAI source code has been re-licensed sometimes, here is the history: 1. CSSL v1.0 starting tag 2026.w14 2. OAI Public License v1.1 starting tag v1.0 till af4b0d53 3. OAI Public License v1.0: starting tag v.04 till v1.0 4. GPL 3: starting tag v.0 till v.04 (only initial implementation of 4G) ## Where to Start * [General overview of documentation](./doc/README.md) * [The implemented features](./doc/FEATURE_SET.md) * [System Requirements for Using OAI Stack](./doc/system_requirements.md) * [How to build](./doc/BUILD.md) * [How to run the modems](./doc/RUNMODEM.md) Not all information is available in a central place, and information for specific sub-systems might be available in the corresponding sub-directories. To find all READMEs, this command might be handy: ``` find . -iname "readme*" ``` ## RAN repository structure The OpenAirInterface (OAI) software is composed of the following parts: ``` openairinterface5g ├── charts ├── ci-scripts : Meta-scripts used by the OSA CI process. Contains also configuration files used day-to-day by CI. ├── CMakeLists.txt : Top-level CMakeLists.txt for building ├── cmake_targets : Build utilities to compile (simulation, emulation and real-time platforms), and generated build files. ├── common : Some common OAI utilities, some other tools can be found at openair2/UTILS. ├── doc : Documentation ├── docker : Dockerfiles to build for Ubuntu and RHEL ├── executables : Top-level executable source files (gNB, eNB, ...) ├── maketags : Script to generate emacs tags. ├── nfapi : (n)FAPI code for MAC-PHY interface ├── openair1 : Layer 1 (3GPP LTE Rel-10/12 PHY, NR Rel-15 PHY) ├── openair2 : Layer 2 (3GPP LTE Rel-10 MAC/RLC/PDCP/RRC/X2AP, LTE Rel-14 M2AP, NR Rel-15+ MAC/RLC/PDCP/SDAP/RRC/X2AP/F1AP/E1AP), E2AP ├── openair3 : Layer 3 (3GPP LTE Rel-10 S1AP/GTP, NR Rel-15 NGAP/GTP) ├── openshift : OpenShift helm charts for some deployment options of OAI ├── radio : Drivers for various radios such as USRP, AW2S, RFsim, 7.2 FHI, ... ├── targets : Some configuration files; only historical relevance, and might be deleted in the future └── tools : Tools for use by the developers/ci machines: code analysis and formatting ``` ## How to get support from the Community You can ask your question on the [mailing lists](https://github.com/duranta-project/openairinterface5g/wiki/MailingList). Your email should contain below information: - A clear subject in your email. - For all the queries there should be [Query\] in the subject of the email and for problems there should be [Problem\]. - In case of a problem, add a small description. - Do not share any photos unless you want to share a diagram. - OAI gNB/DU/CU/CU-CP/CU-UP configuration file in `.conf` format only. - Logs of OAI gNB/DU/CU/CU-CP/CU-UP in `.log` or `.txt` format only. - In case your question is related to performance, include a small description of the machine (Operating System, Kernel version, CPU, RAM and networking card) and diagram of your testing environment. - Known/open issues are present on [Github](https://github.com/duranta-project/openairinterface5g/issues), so keep checking. Always remember a structured email will help us understand your issues quickly.