Device-to-device communication method and system

The embodiment of the invention provides a device-to-device communication method and system. According to the method and system of the invention, signal quality information of signals of a next time period which has not arrived can be inferred according to signal quality information of signals of a time period where a current time point is located, and communication is performed through using a matched communication mode. The communication mode is selected according to the predicted signal quality information of the next time period, and therefore, compared with a mode in which current signal quality information is adopted in the prior art, the device-to-device communication method and system can assist in avoiding time lag of channel state information. The communication mode adopted in the method of the invention is more matched with actual channel state information, and therefore, communication quality can be effectively prompted.