IAB-NODE DEVICE, IAB-DONOR DEVICE AND PATH MIGRATION METHOD

1 . An integrated access and backhaul (IAB) node, a parent node of the IAB-node before migration uses first donor-DU and a parent node of the IAB-node after the migration uses second donor-DU, the first donor-DU belongs to first donor-CU, and the second donor-DU belongs to second donor-CU, the IAB-node comprising:

a receiver configured to, before an IAB-MT of the IAB-node performs handover, receive configuration information transmitted by the first donor-CU, wherein the configuration information at least comprises a first transport network layer (TNL) address anchored at the second donor-DU; and

a processor circuitry configured to apply the configuration information when the IAB-MT completes the handover.

2 . The IAB-node according to claim 1 , wherein the receiver receives the configuration information via a radio resource control message.

3 . The IAB-node according to claim 1 , wherein a child IAB-node of the IAB-node receives configuration information via a radio resource control message transmitted by the first donor-CU, and the configuration information at least comprises a first transport network layer (TNL) address of the child IAB-node anchored at the second donor-DU.

4 . The IAB-node according to claim 1 , wherein the configuration information at least further comprises: a BH RLC channel on a target path, a BAP routing ID configuration for traffic on the target path.

5 . The IAB-node according to claim 1 , wherein the configuration information is transmitted by the second donor-CU to the first donor-CU by using a handover request acknowledge, and is transmitted by the first donor-CU to a parent node of the IAB-MT by using a UE context modification request, and is transmitted by the parent node to the IAB-MT by using a RRC configuration.

6 . The IAB-node according to claim 1 , wherein before the IAB-MT of the IAB-node performs handover, the receiver receives the configuration information transmitted by the first donor-CU, the configuration information being used for configuring replacing a second TNL address anchored at the first donor-DU with the first TNL address anchored at the second donor-DU;

wherein each of the first TNL addresses and the second TNL addresses are used for at least one of F1 user plane data, F1 control plane data or non-F1 data of the IAB-node or a child node.

7 . The IAB-node according to claim 1 , wherein an IAB-DU of the IAB node maintains F1 connection with the first donor-CU.

8 . A method by an integrated access and backhaul (IAB) node which is included a communication system, the communication system includes a first parent node using first donor-DU before migration, a second parent node using second donor-DU after the migration, the first donor-DU belongs to first donor-CU, and the second donor-DU belongs to second donor-CU, the method comprising:

receiving, before an IAB-MT of the IAB node performs handover, configuration information transmitted by the first donor-CU, the configuration information comprising a transport network layer (TNL) address anchored to the second donor-DU; and

applying the TNL address when the IAB-MT completes the handover.

9 . An integrated access and backhaul (IAB) system, including an IAB-donor and an IAB-node;

wherein a parent node of an IAB-node before migration uses first donor-DU and a parent node of the LAB-node after the migration uses second donor-DU, the first donor-DU belongs to first donor-CU, and the second donor-DU belongs to second donor-CU;

before an LAB-MT of the LAB-node performs handover, the IAB-node receives configuration information transmitted by the first donor-CU, the configuration information comprising a transport network layer (TNL) address anchored to the second donor-DU; and applies the TNL address when the IAB-MT completes the handover.