FIG. 3 schematically shows a relay transmission method 200 according to an embodiment of the disclosure. The method 200 may be applied to the abovementioned wireless communication system 100, but the embodiment of the disclosure is not limited thereto. Specifically, the method 200 may be applied to relay transmission of uplink data. That is, remote terminal equipment transmits the uplink data to network equipment through relay terminal equipment. In such case, sender equipment is specifically the remote terminal equipment (which may also be called as D2D terminal equipment) and receiver equipment is specifically the network equipment. Optionally, the method 200 may also be applied to relay transmission of downlink data, that is, the network equipment transmits the downlink data to the remote terminal equipment through the relay terminal equipment. In such case, the sender equipment is the network equipment and the receiver equipment is the remote terminal equipment. However, there are no limits made in the embodiment of the disclosure.
In S210, the sender equipment performs encapsulation processing on data to be sent or information to be sent to generate a first layer-2 PDU.
