In the telecommunications industry, validating 5G-based Dual SIM modems presents many challenges – especially when it comes to electromagnetic compatibility (EMC) testing. A particularly complex scenario arises when an ultra-reliable 5G modem must simultaneously connect to two different network providers operating on distinct frequency bands, resulting in intricate complex emission patterns that require precise measurement.
An Innovation Specialist for Safety-Critical Wireless Connectivity Applications from the heart of Europe faced the challenge of recreating these real-world network scenarios inside a lab environment. Relying on actual cellular networks was not an option since they cover only limited band combinations, restricting the ability to run thorough tests for devices targeting diverse markets such as the US and Asia. Traditional callbox solutions were available but exceeded the allocated budget and lacked flexibility.
The customer discovered the NOFFZ Base Station Emulator: NOFFZ solution for creating custom, test-focused cellular networks. This system allows the device under test (OUT) to register on a controlled cellular network and engage in upload/download sessions with configurable Resource Blocks that simulate realistic operating conditions. A key feature that attracted the customer was the ability to define dual-MNO scenarios, where different frequency bands belong to separate Public Land Mobile Network (PLMN) IDs – essential for testing DualSIM Dual-Active (DSDA) functionality.
During a demo in the customer’s lab, we integrated the NOFFZ Base Station Emulator into the existing infrastructure within 10 minutes, set up two L TE bands, registered the OUT, and started running EMC test scripts immediately. Within 30 minutes, multiple open test requirements (pending for months) were fully covered. The customer quickly decided to order the Base Station Emulator, which we delivered within four weeks, enabling them to address overdue test cases promptly.