A data flow control method and communication device operable to communicate using a first radio access technology (RAT) and a second RAT are described. In a data flow control method, data flow congestion is detected. The congestion can be detected on a first communication link associated with the first RAT. The communication device can be controlled to enter a reduced power operating mode for communications via the first communication link. The entry of the reduced power mode can induce a base station supporting the second communication link associated with the second RAT to perform one or more data flow control operations. A data flow control method can include dropping data packets on a lower protocol layer to induce a higher protocol layer to perform a data flow control operation. The data flow control operation can induce the network to reduce data flow.