receiving first availability information by an integrated access and backhaul (IAB) node, wherein the first availability information informs the IAB node of an availability of distribution unit (DU) resources of the IAB node;

receiving second availability information by the IAB node, wherein the second availability information is applied to a specific child node among a plurality of child nodes connected to the IAB node; and

setting availability of a specific resource for the specific child node to a not-available resource by the IAB node based on the first availability information and the second availability information,

wherein each of the plurality of child nodes is an access user equipment (UE) or another IAB node,

wherein the first availability information is commonly applied to the plurality of child nodes, and

wherein the specific resource is at least one of a hard resource and a soft resource included in the DU resources.