Provided is a communication unit for achieving, in a 5GS, in a case that a situation occurs in which information for connectivity to a Local Area Data Network (LADN) requested by a user equipment is not valid, error processing of a control device of a core network and error processing of the user equipment. Provided is a communication unit for achieving, in a 5GS, in a case that a situation occurs in which information for connectivity to a Local Area Data Network (LADN) requested by a user equipment is not valid, error processing in which a control device of a core network rejects the request of the user equipment. Also provided is a communication unit for achieving, in a case that a situation occurs in which information for connectivity to a LADN requested by a user equipment is not valid, appropriate error processing performed by the user equipment.