OpenAirInterface

OpenAirInterface
Name	OpenAirInterface
Author	Eurecom
Developer	OpenAirInterface Software Alliance
Released	2014
Programming language	C, C++
Operating system	Linux
Genre	Software-defined radio, cellular network stack

OpenAirInterface is an open-source software ecosystem providing implementations of mobile wireless communication stacks for research, development, and experimentation. It supplies protocol implementations for 4G and 5G cellular systems, enabling interoperability with commercial infrastructure from vendors such as Ericsson, Nokia, Huawei, and Samsung Electronics. The project is coordinated by academic and industrial partners including Eurecom, INRIA, CNRS, and industry consortia such as the OpenAirInterface Software Alliance.

History

OpenAirInterface originated from research projects led by Eurecom and Télécom Paris, growing through collaborations with Orange S.A., Ericsson, and Nokia in response to academic initiatives like the European Commission's Horizon 2020 framework. Early releases implemented LTE stacks for experimentation in testbeds associated with institutions such as University of the Mediterranean and Télécom SudParis, later expanding to support 5G New Radio alongside partners from Fraunhofer Society, CEA, and CNRS. Over time the project amassed contributions from companies including Intel, Qualcomm, and Keysight Technologies, and became organized under the OpenAirInterface Software Alliance to coordinate governance, releases, and standard alignment with bodies like the 3rd Generation Partnership Project and European Telecommunications Standards Institute.

Architecture and Components

The software stack is modular, separating layers comparable to those specified by 3GPP releases: a user plane and control plane with protocol implementations for the PDCP, RLC, and MAC layers. Core network elements mirror designs from the Evolved Packet Core and the 5G Core specified by 3GPP, while radio access functions interoperate with software-defined radio front-ends such as USRP devices produced by Ettus Research and National Instruments. The platform integrates real-time processing engines optimized for GNU/Linux environments like Ubuntu and tools used in labs such as Wireshark, Gnuplot, and MATLAB for measurement, debugging, and visualization.

Supported Technologies and Standards

OpenAirInterface implements standards from 3GPP releases, including LTE features from 3GPP Release 8 through later releases and 5G NR features aligned with 3GPP Release 15 and beyond. It supports multiple radio access techniques such as OFDM and MIMO compatible with specifications influenced by research from Bell Labs and standards discussions at IEEE 802.11 forums. Interworking capabilities target interfaces defined by standards bodies like the IETF for IP transport and signalling interactions based on protocols associated with SIP workflows and Diameter-style authentication when integrated with commercial cores.

Development and Community

Development is driven by a consortium model involving academic institutions such as Eurecom, INRIA, CNRS, Imperial College London, and University of Oslo alongside corporate contributors including Intel, Nokia, Orange S.A., and Ericsson. The community organizes workshops and presentations at venues such as Mobile World Congress, IEEE Globecom, and ACM MobiCom, and maintains code repositories with version control practices familiar to contributors from projects like Linux kernel development and OpenStack. Training and outreach occur through developer schools hosted by universities and labs associated with European Commission research networks and national research agencies.

Use Cases and Deployments

Researchers and operators deploy the software in testbeds and pilots run by organizations including Eurecom, Orange S.A., and university laboratories such as Virginia Tech, University of Washington, and University of Bristol. Use cases span prototype base stations for field trials with vendors like Ericsson and Nokia, private campus networks for enterprises such as Siemens, and experimental spectrum sharing studies involving regulators such as Agence nationale des fréquences and discussions at European Telecommunications Standards Institute. The stack is used in demonstrations at events like Mobile World Congress and in academic experiments published at conferences including IEEE INFOCOM and ACM SIGCOMM.

Licensing and Governance

Code contributions are governed by the OpenAirInterface Software Alliance, which defines contribution policies and licensing terms influenced by open-source precedents like the GNU General Public License and Apache License. The governance model balances academic open-research principles from institutions like INRIA and Eurecom with industry practices from members such as Intel and Nokia, coordinating release schedules and compliance with standards set by 3GPP and regulatory frameworks shaped by entities like the European Commission.

Category:Free and open-source software Category:Software defined radio Category:Telecommunications standards