The invention relates to a method and a device for increasing a data throughput in a data transmission via a communication network. In this respect the data packets are examined for redundant data packets on the link layer (5). In case of a temporary transmission failure, the transmission of unacknowledged data packets is repeated on the transport layer (1). Said data packets are provided to the link layer (2). It is the task of the link layer to examine whether the released data packet is a redundant data packet of a data packet already present on the link layer (5). If the redundancy of the data packets is found, the redundant data packet is discarded (7). The data packet is stored on the link layer, if either no data packets are already present on the link layer (4) or if the data packets are not redundant (8).