An embodiment of the invention provides a method, device and system for transmitting and receiving information, which includes: network devices and terminal devices determine the backoff time of the current frame, the network device carries out CCA according to the backoff time and obtains the evaluation result of the CCA, and the evaluation result of the CCA is sent when the channel is in idle state. The terminal device listens to the channel according to the backoff time. When the frame hears the pilot of the network device to receive and receive data on the channel, it solves the problem that the terminal equipment needs to listen to the channel and waste a lot of electricity in the process of the network device in the LBT process; the terminal device is back off according to the backoff. Time is used to intercept the channel, and it can enter the dormant state without listening in other time periods. It reduces the listening time of the terminal equipment to the channel and reduces the amount of electricity consumed by the terminal device for listening.
【技术实现步骤摘要】
【国外来华专利技术】PCT国内申请，说明书已公开。
【技术保护点】
PCT国内申请，权利要求书已公开。
【技术特征摘要】
【国外来华专利技术】PCT国内申请，...
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