Disclosed are a narrow-band cellular communication method and device. A UE firstly receives a first wireless signal, and then sends a second wireless signal and a third wireless signal. The first wireless signal is used for determining the second wireless signal, and the second wireless signal comprises either of {first information, first data}. The sender of the first wireless signal is a first node, and a receiver of the second wireless signal comprises a second node. The first information is generated on a physical layer, and the first data is generated on a high layer. According to the present invention, a UE is allowed to determine a content to be sent on its own initiative, and thus, uplink air interface resources can be utilized more efficiently, and the transmission efficiency is improved. In addition, a relay UE measures and reports relevant information about channel quality of a by-pass link, and the frequency spectrum efficiency is improved so as to improve the overall performance of a system.