A method for operating a first base station in a communication system, the first base station using a first communication link for exchanging data to interoperate with a first core network of the communication system, the communication system comprising a second base station, the method comprising: - detecting a malfunction of the first communication link; and - establishing a second communication link from the first base station to a selected core network of the first and a second core network of the communication system via the second base station, with the second base station receiving data from the first base station via the second communication link and forwarding the received data to the selected core network, whereby the first base station interoperates with the selected core network through the second base station, characterized in that the method further comprises, before detecting the malfunction: - sending an authorization request for a potential connection establishment through the second base station by the first base station to the selected core network via the second base station, the authorization request comprising an indication of the first core network; - the selected core network upon validating the authorization request sending an approval of the authorization request to the second base station; - registering the first base station by the second base station as a malfunctioning base station; and - receiving by the first base station from the second base station the approval of the authorization request indicative of authorization information for subsequent communication of the first base station with the second base station. - detecting a malfunction of the first communication link; and - establishing a second communication link from the first base station to a selected core network of the first and a second core network of the communication system via the second base station, with the second base station receiving data from the first base station via the second communication link and forwarding the received data to the selected core network, whereby the first base station interoperates with the selected core network through the second base station, characterized in that the method further comprises, before detecting the malfunction: - sending an authorization request for a potential connection establishment through the second base station by the first base station to the selected core network via the second base station, the authorization request comprising an indication of the first core network; - the selected core network upon validating the authorization request sending an approval of the authorization request to the second base station; - registering the first base station by the second base station as a malfunctioning base station; and - receiving by the first base station from the second base station the approval of the authorization request indicative of authorization information for subsequent communication of the first base station with the second base station. - sending an authorization request for a potential connection establishment through the second base station by the first base station to the selected core network via the second base station, the authorization request comprising an indication of the first core network; - the selected core network upon validating the authorization request sending an approval of the authorization request to the second base station; - registering the first base station by the second base station as a malfunctioning base station; and - receiving by the first base station from the second base station the approval of the authorization request indicative of authorization information for subsequent communication of the first base station with the second base station.