Downlink data transmission method between a relay node and ue

The invention provides a method for transmitting downlink data between a relay node and UE (User Equipment). The method comprises steps: for the UE within the coverage of any RN (Relay Node), an eNodeB directly notifies the RN and the UE, and the UE sends time frequency resources and parameters of an SRS (Surveillance Reference Signal); the UE sends the SRS according to the notification sent by the eNodeB; the RN receives the SRS according to the notification sent by the eNodeB and obtains wireless channel features between the UE and the RN according to the SRS; and according to the wireless channel features, the RN performs beam-forming, time frequency synchronous fine adjustment and power control on the downlink signals sent to the UE. By the application of the method, the RN performs the beam-forming on a downlink forwarding service channel self-adaptively according to the detection on the SRS without adding uplink and downlink signallings so that the downlink data transmission performance is improved greatly, the data receptivity of the UE and the wireless system performance are improved, and the wireless interference around the RN coverage is reduced.