Step 2-6-2: the first node transmits the user data according to the configuration in step 2-6-1. For example, the first node uses the configuration in step 2-6-1 to transmit the data packets cached before the configuration update or before the migration, and different types of data packets will be transmitted with different configurations. Further, when the first node transmits these data packets, it will change the information contained in the data packets (for the information that needs to be modified, please refer to the “third information related to the information contained in the data packet” in above step 2-6-1).
Another technical problem of this aspect is that: when the parent node of a relay node changes, the network side performs relevant configuration updates on the relay node or its child node, and these updates will involve data transmission from that relay node or its child node, which introduces a lot of signaling overhead to the network, and increases the burden on the network.