A method for controlling transmission resources for transmission and re-transmission of packets of a plurality of automatic repeat request processes comprises allocating, for each of the plurality of automatic repeat request processes, a transmission resource for transmission of a packet of the automatic repeat request process. The method further comprises allocating transmission resources as one or more re-transmission opportunities for re-transmission of the packet of at least two of the automatic repeat request processes such that at least two of the at least two automatic repeat request processes share transmission resource for at least one of the re-transmission opportunities. The method also comprises transmitting at least one control message indicating the allocated transmission resources. An electronic device for controlling transmission and retransmission of packets of a plurality of automatic repeat request processes is also described.