IAB node dual connectivity setup method and communication apparatus

A communication apparatus, comprising:

• at least one processor;
• and
• one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising:
• sending first information to a centralized unit (CU) of an integrated access and backhaul (IAB) donor, wherein the first information is used to request to allocate internet protocol (IP) address to an IAB node, and wherein the communication apparatus is the IAB node or an apparatus included in the IAB node, and wherein the first information comprises a quantity of IP addresses requested to be allocated to the IAB node or a quantity of IP addresses requested to be allocated to an F1 control plane (F1-C) interface or an F1 user plane (F1-U) interface, wherein the F1-C interface is a communication interface between the IAB node and a CU-control plane (CU-CP) of the IAB donor, and the F1-U interface is a communication interface between the IAB node and a CU-user plane (CU-UP) of the IAB donor;
• and
• receiving a backhaul adaptation protocol (BAP) address from the CU of the IAB donor, wherein the BAP address is of a distributed unit (DU) of the IAB donor and the BAP address corresponds to one or more IP addresses that are allocated to the IAB node.

A communication system, comprising:

• a centralized unit (CU) of an integrated access and backhaul (IAB) donor, wherein the CU of the IAB donor comprises:
• at least one first processor;
• and
• one or more first memories coupled to the at least one first processor and storing first programming instructions for execution by the at least one first processor to perform first operations comprising:
• receiving first information from an IAB node, wherein the first information is used to request to allocate internet protocol (IP) address to the IAB node, and wherein the first information comprises a quantity of IP addresses requested to be allocated to the IAB node or a quantity of IP addresses requested to be allocated to an F1 control plane (F1-C) interface or an F1 user plane (F1-U) interface, wherein the F1-C interface is a communication interface between the IAB node and a CU-control plane (CU-CP) of the IAB donor, and the F1-U interface is a communication interface between the IAB node and a CU-user plane (CU-UP) of the IAB donor;
• in response to receiving the first information, sending, to a distributed unit (DU) of the IAB donor, a request for allocating IP address to the IAB node;
• receiving, from the DU of the IAB donor, one or more IP addresses that are allocated to the IAB node;
• and
• sending, to the IAB node, a backhaul adaptation protocol (BAP) address that is of the DU of the IAB donor and that corresponds to the one or more IP addresses;
• and
• the IAB node, wherein the IAB node comprises:
• at least one second processor;
• and
• one or more second memories coupled to the at least one second processor and storing second programming instructions for execution by the at least one second processor to perform second operations comprising:
• sending the first information to the CU of the IAB donor;
• and
• receiving the BAP address from the CU of the IAB donor.