To facilitate 5G application and ensure compatibility of 5G mobile communication with other radio services in the frequency band of 2100MHz, on 4 March 2021 MIIT released the Technical requirements for radio frequency of 5G mobile communication base stations in the frequency band of 2100MHz (trial) (hereinafter referred to as “Regulation”).
The Regulation allocates 1920-1980MHz for 5G base stations to receive signal, while 2110-2170MHz for emitting signals. It also outlines the limits for out-of-band unwanted emissions and spurious emissions to reduce the possibility of interference that 5G systems may bring. The Regulation also stipulates that relevant sector standards or 3GPP standards shall be followed, either for technical requirements or for test methods, for other technical parameters, such as the base station’s transmission power tolerance, adjacent channel rejection ratio, spectrum emission mask, bandwidth occupied, transmitter intermodulation, total power dynamic range, error vector magnitude (EVM), frequency error, etc. This is because all Chinese 5G standards are, in fact, sector standards and are identical to their 3GPP counterparts, thus following either will not lead to discrepancy.