An integrated access and backhaul (IAB) donor device in a first donor-CU includes: a transmitter configured to transmit an IAB transport migration management request for a migrated traffic to a second donor-CU, and wherein the LAB transport migration management request is used to request for releasing a resource serving for the traffic in the topology of the second donor-CU, wherein an IAB-DU of an IAB node maintains F1 connection with the first donor-CU, and the resource serving for the traffic of the LAB node has been established in a topology of the second donor-CU.