An information transmission method performed by a first terminal device, comprising: receiving, from a second wireless device, a measurement reference signal, wherein a subcarrier spacing of the measurement reference signal is a multiple of a subcarrier spacing of a data channel, receiving configuration information from a wireless network device, wherein the configuration information comprises information used to configure the measurement reference signal, and the information about the measurement reference signal comprises information about the subcarrier spacing of the measurement reference signal, wherein the information about the subcarrier spacing of the measurement reference signal comprises information about a quantity of times by which the subcarrier spacing of the measurement reference signal is the subcarrier spacing of the data channel of the first terminal device, receiving characteristic information of a time domain resource unit from the wireless network device through a downlink control channel, wherein the characteristic information is related to interference to the time domain resource unit, or is related to a data transmission direction on the time domain resource unit, wherein the data transmission direction corresponds to a type of interference information and the time domain resource unit comprises a resource used to transmit, by the second terminal device, the measurement reference signal; and sending a measurement result to the wireless network device, wherein the measurement result is related to the characteristic information of the time domain resource unit and the received measurement reference signal. receiving, from a second wireless device, a measurement reference signal, wherein a subcarrier spacing of the measurement reference signal is a multiple of a subcarrier spacing of a data channel, receiving configuration information from a wireless network device, wherein the configuration information comprises information used to configure the measurement reference signal, and the information about the measurement reference signal comprises information about the subcarrier spacing of the measurement reference signal, wherein the information about the subcarrier spacing of the measurement reference signal comprises information about a quantity of times by which the subcarrier spacing of the measurement reference signal is the subcarrier spacing of the data channel of the first terminal device, receiving characteristic information of a time domain resource unit from the wireless network device through a downlink control channel, wherein the characteristic information is related to interference to the time domain resource unit, or is related to a data transmission direction on the time domain resource unit, wherein the data transmission direction corresponds to a type of interference information and the time domain resource unit comprises a resource used to transmit, by the second terminal device, the measurement reference signal; and sending a measurement result to the wireless network device, wherein the measurement result is related to the characteristic information of the time domain resource unit and the received measurement reference signal.