It is provided a method, comprising predicting if a received coded data block can be successfully decoded by a predetermined decoder adapted to apply a predetermined decoding on the coded data block, wherein the predetermined decoder is comprised in a central device; requesting a retransmission of the coded data block to an apparatus performing the method if it is predicted that the coded data block cannot be decoded by the decoder; forwarding the coded data block and a result of the prediction to the central device without applying the predetermined decoding to the coded data block.