Open does not mean plug and play
The promise of Open RAN is that equipment from different suppliers can work together. The reality is that published interfaces still leave room for interpretation, optional features and implementation differences. Interoperability must therefore be demonstrated by testing, and the quality of that testing is one of the best predictors of whether a multi-vendor deployment will go smoothly.
Three layers of testing
- Conformance testing: checks that a single product follows the specification for an interface.
- Interoperability testing: checks that two or more products from different suppliers exchange messages and behave correctly together.
- End-to-end testing: checks that the full chain, from radio through core, meets performance, stability and security targets under realistic load.
Each layer catches different problems. A product can pass conformance checks yet fail in combination, and a combination can interoperate in a lab yet struggle at scale.
Where testing happens
The O-RAN ALLIANCE supports a network of open test and integration centers and organizes public events where vendors test products against each other. The Telecom Infra Project and the O-RAN Software Community also contribute reference work and community testing. Operators additionally run their own labs and field trials, which matter most because they reflect the operator's specific mix of products, spectrum and traffic.
What buyers should request
Ask for the specific specification versions and profiles tested, the names of the other vendors in the test, the test plan and results, and whether the testing was independent or run by the supplier. Request evidence for the exact software versions you will deploy, since a result for an older release may not apply. Ask who owns integration after deployment and what happens when a fault involves several suppliers. Contracts should specify responsibility and response times.
Testing for the 6G transition
As standards for 6G emerge, testing methods will have to evolve, including test tools for new frequency ranges, wider bandwidths and AI-driven functions. Operators can prepare by building automated test pipelines, keeping lab environments that mirror production and retaining test data. Treat testing as a continuing capability and not a one-time gate.
A short rule of thumb applies. If a vendor cannot show a multi-vendor test result for the combination you plan to buy, treat the claim of interoperability as unproven.
Building an internal integration lab
A lab that mirrors production is one of the best investments an operator can make. Include radio units, distributed and centralized units, a RIC, a management system, a core and traffic generators. Automate test runs so that every new software release is checked against the same cases. Record baselines for throughput, latency, stability and energy use. Over time, the lab becomes a shared source of truth that lets engineering, procurement and vendors discuss issues using evidence.
Handling failures
Expect some tests to fail, and plan how to resolve them. Agree with each supplier on a joint troubleshooting process, a shared ticketing path and target times for fixes. Keep a log of every interoperability issue with its cause and resolution, since patterns in the log show which interfaces and vendors need closer attention.
