In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes, by a relay node, including additional information in a failure occurrence notification indicating occurrence of a failure in a first backhaul link between a first parent node and the relay node, and transmitting the additional information to a child node. The communication control method includes receiving, by the child node, the failure occurrence notification including the additional information. Here, the additional information includes a first BAP routing ID unavailable due to the failure and/or a first destination BAP address included in the first BAP routing ID, and includes identification information indicating that the additional information includes the BAP routing ID and/or the first destination BAP address.