The invention relates to a frequency calibration method for an ultra
narrowband Internet of Things (IOT) of radio and television spectrums. The method includes the steps of detecting and analyzing a channel, dividing the channel into a plurality of sub channels based on frequencies according to a predetermined rule, and
multiplexing first control information in the sub channels, the first control information being used to indicate the selection mode of the sub channels according to a predetermined rule and the first control information occupying the sub channels in the middle of the channel. In the invention, second control information is also multiplexed in the sub channels, the second control information is used to indicate a
demodulation parameter of data, and the second control information occupies the sub channels at both ends of the channel. The frequency calibration method of the invention can divide the channel into the plurality of sub channels and select the best allocation criterion to select the sub channels, thereby improving the efficiency of
information transmission and allowing the
rational use of storage space.