The remote end integrates 5GHz WiFi bridge and 4G base station functions in an integrated design. It is installed on the top of the elevator car outside the elevator cabin. It mainly has functions such as wireless data return of cellular base station, wireless resource management, mobility management, physical layer processing, transceiver function, and equipment status monitoring. The 4G base station module supports built-in (default built-in antenna) and external antennas. It can use built-in antennas or external antennas to introduce 4G signals into the elevator car to provide users with stable coverage in all directions.