The method of transmitting channel information, devices and systems

The present invention discloses a method for transmitting channel information, apparatus and system belongs to the field of wireless communications. Channel information obtaining method comprising: a beam beamformer request receiver acquires channel information transmitted within a first length of time of the current TXOP; and if not the beamformer receiving the channel length of the current time of the first transmission opportunity TXOP information; if the TXOP obtain a second beamformer, the transmission channel information indicating the channel information request frame, and sent to the receiver beam receiver channel information in the second TXOP. The system includes a beamformer and beam receiver. The present invention saves power overhead signaling resource beamformer and beam receiver.