SRRC Filing Timelines for a Product Entering China
SRRC radio type approval in China takes 8 to 16 weeks, requiring local agent representation, strict customs sample clearing, and accredited domestic lab scans.
Multi-Band Cellular Approval
Meaning
Cellular radio certification provides the regulatory assurance that a wireless communication device operates across multiple frequency bands without violating regional spectral output limits. Manufacturers pursue multi-band cellular approval to demonstrate that power levels, modulation schemes and harmonic emissions stay within authorized constraints when the hardware switches between bands during operation. This validation process confirms that the device manages co-existence between disparate radio access technologies effectively.
Regulatory Compliance
Authorities require evidence that the equipment maintains electromagnetic compatibility during handovers between different network frequencies. Testing laboratories measure the radiated output to ensure that the multi-band cellular approval criteria stay satisfied as the modem cycles through various carrier configurations. Technicians observe the spectral masks for each supported band to prevent interference with neighboring channels.
Product Integration
Hardware designers implement specific filter architectures and antenna matching networks to support these broad operational requirements. Integration teams perform over-the-air performance tests to confirm that the internal layout does not introduce desensitization while the transmitter moves through the supported multi-band cellular approval range. Correct shielding prevents internal noise from coupling into sensitive receiver paths during multi-frequency scanning.
System Validation
Comprehensive test plans verify that firmware controls prevent the device from transmitting on unauthorized frequencies while roaming across international borders. Performance under varied thermal and voltage conditions determines whether the multi-band cellular approval remains valid throughout the life cycle of the product. Sufficient gain flatness across the entire frequency range governs the final success of the certification.