On July 1, 2027, China will implement GB 45672-2025, the country’s first mandatory standard for Vehicle Accident Emergency Call Systems (AECS). The regulation requires that M1 passenger cars (up to 9 seats) and N1 light trucks (up to 3.5 tons) are equipped with reliable emergency call systems, including accurate satellite-based positioning, stable network connections, and both automatic and manual trigger mechanisms.

This standard represents a major step toward improving traffic safety and emergency response times. By specifying requirements for positioning, communication stability, and voice system performance, GB 45672-2025 ensures that vehicles can send precise accident data to emergency services, maximizing the so-called “golden hour” for rescue operations.

The rise of Next-Generation eCall (NG eCall), leveraging LTE and 5G connectivity, further enhances these capabilities. Unlike traditional eCall, which relied on 2G or 3G voice calls, NG eCall can transmit rich data packets, including real-time GPS coordinates, vehicle diagnostics, sensor data, and potentially live video feeds. This allows emergency responders to react faster and more effectively, ultimately saving lives.

For OEMs and Tier 1 suppliers preparing for compliance, robust testing is essential. The NOFFZ Base Station Emulator (BSE) NG eCall provides a complete solution to validate vehicle emergency call systems under real-world conditions. It supports dual-cell LTE and 5G network emulation, allowing developers to simulate varying network topologies, signal strengths, and handover scenarios.

The BSE enables automatic trigger simulation for all required crash types, including frontal, side, rear collisions, and optional rollover, [MY1] [DH2] [MY3] while also offering MSD (Minimum Set of Data) decoding to verify vehicle location, identification, crash status, and timestamps in real time.

Here is how a realistic simulations unfolds:

• System Initialization: A dual-cell LTE configuration is created and booted. Once airplane mode is disabled on the TCU, the device successfully connects to the BSE network. Connection status can be verified using AT commands, confirming an active connection between the modem and BSE.
• Network Behavior: For the purpose of the test, all other traffic is disabled to better observe the NG eCall trigger event.
• Triggering NG eCall: As the emergency button is pressed on the TCU the NG eCall immediately initiates an eCall to 911. We can confirm the eCall status using the BSE graphical user interface or the test automation API.
• MSD Analysis: During the eCall, the parties exchange the MSD (Minimum Set of Data) in ASN format, which includes the timestamp and GPS coordinates. A custom script converts these coordinates into decimal GPS format for easier interpretation. As expected, the location matches that of the test lab.

Additionally, the solution supports scripted automation and API integration, enabling batch testing across multiple devices and configurations. This streamlines workflows, reduces manual testing errors, and provides detailed logs for regulatory documentation and internal quality assurance. By combining realistic network emulation with precise crash and emergency call simulations, the NOFFZ BSE NG eCall helps automotive developers meet all GB 45672-2025 requirements efficiently and reliably before production.

The BSE enables automatic simulation of all required crash types - including frontal, side, rear collisions, and optional rollover to verify the correct behavior of E-Call functions triggered by crashes or manual button activation.