In an example, a method performed by central unit control plane, CU-CP, of a base station for providing Integrated Access and Backhaul, IAB, bearer mapping information is disclosed. The base station is configured as a donor base station for one or more IAB nodes. The method comprises transmitting, to a distributed unit DU of the base station which is configured as a donor DU for one or more IAB nodes, mapping information to map one or more field values to one or more backhaul radio link control BH RLC channels between the DU and a first IAB node on a downlink path.