3GPP base station conformance testing

Base station specifications according to 3GPP TS 38.10438.104

Before base stations can start operation, they must pass conformance testing in their region of deployment. In LTE networks, these base stations are known as eNodeB (eNB). Their RF conformance requirements are defined separately, in 3GPP TS 36.141.

In 5G NR networks, base stations are known as gNBs, and gNB testing follows the 3GPP conformance framework in TS 38.141. The framework covers transmitter characteristics (chapter 6), receiver characteristics (chapter 7) and performance requirements (chapter 8). The defined measurements and specifications are documented in TS 38.141 -1 for conducted conformance testing and TS 38.141-2 for radiated conformance testing, both of which refer to the core base station conformance requirements outlined in TS 38.104.

The 3GPP specifications for 5G NR base station conformance testing continue to evolve across recent releases (including Release 18 and 19 and beyond), introducing enhancements while maintaining a consistent testing framework.

Base station platforms vary in design and deployment, spanning traditional integrated architectures and Open RAN implementations. These architectural differences do not change the underlying 3GPP requirements. However, they do influence how conformance testing is set up and executed. For Open RAN implementations, TS 38.141 conformance testing typically requires an O-RU to be paired with an O-DU or O-DU emulator. Depending on the applicable base station type, both conducted conformance testing and radiated conformance testing, also known as over-the-air (OTA) conformance testing, may be required.

Base station specifications according to 3GPP TS 38.10438.104

Before base stations can start operation, they must pass conformance testing in their region of deployment. In LTE networks, these base stations are known as eNodeB (eNB). Their RF conformance requirements are defined separately, in 3GPP TS 36.141.

In 5G NR networks, base stations are known as gNBs, and gNB testing follows the 3GPP conformance framework in TS 38.141. The framework covers transmitter characteristics (chapter 6), receiver characteristics (chapter 7) and performance requirements (chapter 8). The defined measurements and specifications are documented in TS 38.141 -1 for conducted conformance testing and TS 38.141-2 for radiated conformance testing, both of which refer to the core base station conformance requirements outlined in TS 38.104.

The 3GPP specifications for 5G NR base station conformance testing continue to evolve across recent releases (including Release 18 and 19 and beyond), introducing enhancements while maintaining a consistent testing framework.

Base station platforms vary in design and deployment, spanning traditional integrated architectures and Open RAN implementations. These architectural differences do not change the underlying 3GPP requirements. However, they do influence how conformance testing is set up and executed. For Open RAN implementations, TS 38.141 conformance testing typically requires an O-RU to be paired with an O-DU or O-DU emulator. Depending on the applicable base station type, both conducted conformance testing and radiated conformance testing, also known as over-the-air (OTA) conformance testing, may be required.

Master your base station conformance testing challenges

5G NR conformance testing requires verification of transmitter, receiver and performance requirements according to 3GPP TS 38.141. Similar validation principles also apply to LTE base station conformance testing under TS 36.141. Validation teams must maintain specification compliance, measurement accuracy and efficient test workflows across both conducted and OTA test environments, which brings several challenges.

• Managing a large conformance validation matrix: Conformance specifications define transmitter, receiver and performance test cases. These span multiple bands, bandwidths, test models, power classes and deployment scenarios, increasing the number of items to validate.
• Configuring complex signal scenarios: Receiver and performance tests require precise combinations of wanted signals, additive white Gaussian noise (AWGN), fading profiles, modulated interferers and continuous wave (CW) interferers. Building specification-compliant environments while minimizing setup time and configuration errors can be challenging.
• Maintaining measurement accuracy and repeatability: Reliable pass/fail decisions depend on accurate signal levels, proper calibration and repeatable test conditions across all conformance measurements.

These challenges grow with the diversity of base station architectures, from traditional integrated designs to Open RAN implementations. They call for measurement instruments and test workflows that can keep pace while maintaining full alignment with 3GPP specifications. Addressing them requires a set of test solutions built for this complexity.

Discover the best 3GPP base station conformance testing solution for you

Rohde & Schwarz offers a broad solutions portfolio for base station conformance testing, ranging from signal generators and signal analyzers to turnkey test systems and shielded chamber environments.

• A signal generator and signal and spectrum analyzer combo is ideal for testing base station transmitter and receiver characteristics, covering both spurious emissions and receiver performance under realistic signal conditions.
  • The R&S®FSW signal and spectrum analyzer offers high dynamic range, low phase noise and wide analysis bandwidth for spurious emissions testing. It also provides predefined measurement configurations for 3GPP-defined conformance measurements.
  • The R&S®SMW200A vector signal generator tests base station receiver performance under realistic conditions. Its optional integrated fading simulator and multi-channel architecture combine fading, AWGN and interference signal generation in one instrument, without additional external equipment. It also provides real-time hybrid automatic repeat request (HARQ) feedback required for 3GPP TS 38.141 (chapter 8) performance testing.
• A test case wizard quickly configures specification-compliant test cases, using built-in presets for fixed reference channels and test models.
• OTA chambers, such as the compact and 3GPP-compliant R&S®ATS1800C, are necessary for the radiated conformance testing of FR2 (mmWave) base stations.

In base station architectures where the radio unit (O-RU) is disaggregated from the baseband processing, as in Open RAN implementations, conformance testing extends beyond standalone RF validation. The physical layer is split between the O-RU and the distributed unit (O-DU), and testing requires an O-DU or O-DU emulator alongside the O-RU. This enables 3GPP RF conformance testing of the disaggregated O-RAN architecture under realistic operating conditions and confirms proper interaction across the open fronthaul interface.