IAB-DONOR DEVICE AND TRANSPORT MIGRATION MANAGEMENT METHOD

1 . An integrated access and backhaul (JAB) donor device in a first donor-CU, comprising:

a transmitter configured to transmit an JAB transport migration management request for modifying a migrated traffic of an IAB node to a second donor-CU; and

a receiver configured to receive an JAB transport migration management response for the traffic transmitted by the second donor-CU;

wherein an JAB-DU of the JAB node maintains F1 connection with the first donor-CU, and a resource serving for the traffic has been established in a topology of the second donor-CU.

2 . The device according to claim 1 , wherein an JAB-MT of the JAB-node maintains radio resource control connection with the second donor-CU, or an IAB-MT of the IAB-node maintains radio resource control connection with the first donor-CU;

the traffic includes at least one or a combination of the following: an F1 control plane traffic, an F1 user plane traffic, or a non-F1 traffic.

3 . The device according to claim 1 , wherein the transmitter transmits to the second donor-CU the JAB transport migration management request used for requesting to modify the resource serving for the traffic in the topology of the second donor-CU.

4 . The device according to claim 3 , wherein the receiver receives the JAB transport migration management response for modifying the resource serving for the traffic in the topology of the second donor-CU, transmitted by the second donor-CU.

5 . The device according to claim 1 , wherein the JAB transport migration management request includes the following information: an identifier of the traffic, quality of service and/or a type of the traffic;

the JAB transport migration management response includes the following information: the identifier of the traffic, and backhaul information of the traffic in the topology of the second donor-CU.

6 . The device according to claim 5 , wherein the backhaul information in the topology of the second donor-CU includes at least one of the following:

an ingress routing identifier of a downlink traffic;

an ingress backhaul radio link control channel of the downlink traffic;

a prior-hop backhaul adaptation protocol address of the downlink traffic; or

quality of service (QoS) mapping information of the downlink traffic.

7 . The device according to claim 5 , wherein the backhaul information in the topology of the second donor-CU includes at least one of the following:

an egress routing identifier of an uplink traffic;

an egress backhaul radio link control channel of the uplink traffic; or

a next-hop backhaul adaptation protocol address of the uplink traffic.

8 . The device according to claim 1 , wherein the device further comprises:

processor circuitry configured to perform at least one of the following operations:

updating quality of service (QoS) mapping information of the traffic;

configuring the IAB-node with uplink BH information for updating the traffic;

configuring the IAB-node to update at least one of the following: header rewriting information of a backhaul adaptation protocol between topologies in an uplink direction, routing information in the topology of the second donor-CU, or backhaul radio link control channel mapping information between the topologies in the uplink direction; or

configuring the IAB-node to update at least one of the following: header rewriting information of a backhaul adaptation protocol between topologies in a downlink direction, or backhaul radio link control channel mapping information between the topologies in the downlink direction.

9 . The device according to claim 8 , wherein the IAB transport migration management request is used for requesting modification of an IP address for the IAB-node.

10 . The device according to claim 9 , wherein the IAB transport migration management request includes at least one of the following information: an IAB-node identifier or an IP address request index, a backhaul adaptation protocol address of a donor-DU in a topology of the first donor-CU, or an IP address anchored at the donor-DU.

11 . The device according to claim 9 , wherein the IAB transport migration management response is used for modifying the IP address for the IAB-node, transmitted by the second donor-CU.

12 . The device according to claim 11 , wherein the IAB transport migration management response includes the following information: an IAB-node identifier or IP address request index, a backhaul adaptation protocol address, and an IP address anchored at the donor-DU in the topology of second donor-CU.

13 . The device according to claim 11 , wherein the processor circuitry configures the IAB-node with an IP address anchored at a donor-DU in the topology of second donor-CU.

14 . The device according to claim 3 , wherein the receiver receives the IAB transport migration management response for rejecting the IAB transport migration management request for the traffic, transmitted by the second donor-CU;

wherein the IAB transport migration management response includes the identifier of the traffic.

15 . The device according to claim 1 , wherein in a case where the IAB-MT of the IAB-node is switched from the first donor-CU to the second donor-CU, and one or more resources for serving for one or more traffics of the IAB-node has been established in the topology of the second donor-CU, the transmitter transmits the IAB transport migration management request for the one or more traffics;

or, in a case where the IAB-MT of the IAB-node is reestablished from the first donor-CU to the second donor-CU, and one or more resources for serving for one or more traffics of the IAB-node has been established in the topology of the second donor-CU, the transmitter transmits the IAB transport migration management request for the one or more traffics;

or, in a case where the IAB-MT of the IAB-node has established dual-connection with the first donor-CU and the second donor-CU, and one or more resources for serving for one or more traffics of the IAB-node has been established in the topology of the second donor-CU, the transmitter transmits the IAB transport migration management request for the one or more traffics.

16 . An integrated access and backhaul (IAB) donor device in a second donor-CU, comprising:

a transmitter configured to transmit an IAB transport migration modification request for a migrated traffic of an IAB node to a first donor-CU; and

processor circuitry configured to modify a resource serving for the traffic in a topology of the second donor-CU;

wherein an IAB-DU of the IAB node maintains F1 connection with the first donor-CU, and the resource serving for the traffic has been established in the topology of the second donor-CU.

17 . The device according to claim 16 , wherein the transmitter transmits to the first donor-CU the IAB transport migration modification request used for modifying a routing identifier and/or a backhaul radio link control channel of the traffic in the topology of the second donor-CU.

18 . The device according to claim 16 , wherein the processor circuitry performs at least one of the following operations:

updating a backhaul radio link control channel and/or backhaul adaptation protocol sublayer routing used by the traffic on a path in the topology of the second donor-CU;

updating uplink backhaul information of the traffic, wherein the uplink backhaul information includes a routing identifier, an uplink backhaul radio link control channel and/or a backhaul adaptation protocol address of a next-hop node; or

updating an uplink egress routing identifier, an egress backhaul radio link control channel and/or a backhaul adaptation protocol address of the next-hop node of the traffic; or, updating a downlink ingress routing identifier, an ingress backhaul radio link control channel and/or a backhaul adaptation protocol address of a prior-hop node of the traffic.

19 . The device according to claim 16 , wherein the IAB transport migration modification request is used for modifying an IP address for the IAB-node.

20 . An integrated access and backhaul (IAB) system, comprising a first donor-CU and a second donor-CU;

the first donor-CU transmits an IAB transport migration management request for a traffic, and receives an IAB transport migration management response for the traffic; the second donor-CU receives the IAB transport migration management request and transmits the IAB transport migration management response;

or,

the second donor-CU transmits an IAB transport migration modification request for a traffic, and modifies a resource serving for the traffic in a topology of the second donor-CU, and the first donor-CU receives the IAB transport migration modification request.