Overview
OpenAirInterface (OAI) is an open-source mobile-network software project used to build and study 4G and 5G systems. In practice, it is especially important as a research and lab platform for open and software-defined radio access networks.
Within this note’s context, OAI is most useful as:
- an open RAN experimentation platform
- a software implementation for 5G SA lab validation
- a practical reference for CU/DU and split-RAN deployment work
Why It Matters
OAI is valuable because it gives researchers and builders direct access to an end-to-end cellular software stack rather than just documentation or black-box vendor gear. That makes it useful for:
- validating RAN architecture ideas
- experimenting with disaggregation and open interfaces
- testing interoperability with open cores and user equipment
- learning how practical 5G radio software is assembled and deployed
O-RAN RU Context
When OAI is used in O-RAN-style deployments, radio-unit compatibility and transport details become important. The note below is therefore a practical starting point when working with external radio units:
Practical Reading
If the goal is to use OAI in a lab or testbed, the most useful way to read the project is:
- first understand the overall RAN architecture
- then understand the split model, especially split 7.2 (vRAN model)
- then focus on OAI-specific CU/DU deployment details
- finally validate radio-unit, UE, and core-network interoperability
Resources
- System requirements: https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/develop/doc/system_requirements.md#o-ran-radio-units
- O-RAN fronthaul split 7.2 tutorial: https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/develop/doc/ORAN_FHI7.2_Tutorial.md