A method and a system for data transmission with mobile network nodes, which include at least two network interfaces with corresponding power consumption. A central unit is configured to receive data intended for the mobile network, and a first network interface of the mobile network node is deactivated. If the central unit receives data intended for themobile network node, a signaling message assigned to the received data is transmitted to the mobile network node, by a signaling module, via a second network interface of the mobile network node. Based on the transmitted signaling message, the first network interface of the mobile network node is activated, and data, which are intended for the mobile network node, are transmitted via the first network interface to the mobile network node.