Managing Dual Band Radio Laboratory Testing under Chinese Regulatory Frameworks
SRRC approval for dual-band radios demands locked firmware power tables, local agent coordination, and strict host radiated spur compliance to avoid re-test delays.
MIIT Notice 2021-129
Meaning
Regulatory decrees in China govern the technical parameters and approval procedures for low-power, short-range radio transmitter devices. Under this regime, the miit notice 2021-129 establishes strict operational requirements for products using unlicensed frequency bands.
Technical Mandate
The regulation narrows the allowed frequency bands and lowers the maximum radiated power limits for several classes of unlicensed equipment. Under the rules of the miit notice 2021-129, certain short-range devices must incorporate automatic transmission limiters and dynamic frequency selection to share channels gracefully. It also prohibits the use of some previously allowed channels, forcing semiconductor vendors to release updated region-specific firmware for their modules.
Integration Impact
System integrators must evaluate their existing component supply chains to ensure that incoming radio modules comply with the new rules. Since the enforcement of the miit notice 2021-129, older modules that do not meet the stricter out-of-band emission limits can no longer be legally imported or built into new products. This transition requires board designers to verify that their active component variants are certified under the current decree, avoiding costly redesigns late in the product development cycle.
It also affects the labeling requirements on the external product enclosure.
Certification Protocol
Compliance laboratories run a revised battery of tests to confirm that the equipment meets the updated limits before issuing the State Radio Regulatory Commission approval. The test program measures spurious emissions across a broader frequency range and under varying temperature conditions to ensure compliance. If a wireless device fails to satisfy the criteria of the miit notice 2021-129, the application is rejected, preventing the product from being distributed in the domestic market.