Optionally, the RNTI of the remote terminal equipment may be predefined or allocated to the remote terminal equipment by the network equipment. For example, the network equipment allocates the RNTI to the remote terminal equipment in the process of establishing the bearer for the remote terminal equipment. In such case, the relay terminal equipment may determine the remote terminal equipment corresponding to the first layer-2 PDU according to the RNTI adopted for the PDCCH configured to schedule the first layer-2 PDU. However, the embodiment of the disclosure is not limited thereto.
Optionally, the relay terminal equipment may perform encapsulation processing on the data contained in the first layer-2 PDU to generate the second layer-2 PDU. For example, encapsulation processing is performed on the data contained in the first layer-2 PDU in layer 2 to generate the second layer-2 PDU. Here, the first layer-2 PDU may meet an interface communication protocol between the relay terminal equipment and the sender equipment, and the second layer-2 PDU may meet an interface communication protocol between the relay terminal equipment and the receiver equipment.