A system includes a first node, a second node, and a third node, wherein the first node establishes a wireless communication link with the second node to perform wireless communication, and forwards connection information of the wireless communication to the third node; and the third node receives, by listening on the wireless communication link based on the connection information, transmission data sent by the second node to the first node. If an error occurs when the third node receives the transmission data sent by the second node to the first node, the third node interferes with the first node's reception of the transmission data sent by the second node, so that an error is caused when the first node receives the transmission data sent by the second node, and the second node is triggered to perform retransmission.