A method, performed in a transmitting device, for transmitting additional information to a receiving device in a wireless communications network, wherein the method comprises: determining one or more information bits as additional information to transmit to the receiving device; mapping said one or more information bits to a certain order of different circular shifts, wherein the certain order indicates said one or more information bits implicitly at the receiving device; determining an order of the different circular shifts of repeated blocks of data as a set of transmission parameters indicating the additional information, each circular shift shifting bits differently, and wherein the set of transmission parameters is associated with the additional information and determined from a plurality of sets of transmission parameters; wherein the order is determined as said certain order; wherein the repeated block of data is repeated 7 times in the first time division multiple access, TDMA, frames of each of 4 consecutive 51-multiframes of the TDMA frames and a different circular shift is applied to the repeated blocks of data depending on which 51-multiframe is being transmitted, whereby the additional information consists of 2 bits that are transmitted using said determined order of 4 different circular shifts, and the additional information is indicated by how said 4 different circular shifts map to said four consecutive 51-multiframes; and transmitting 4 consecutive 51-multiframes of the TDMA frames to the receiving device using the determined set of transmission parameters, thereby indicating the additional information to the receiving device; wherein the information refers to the repeated blocks of data interleaved using the different circular shifts. determining one or more information bits as additional information to transmit to the receiving device; mapping said one or more information bits to a certain order of different circular shifts, wherein the certain order indicates said one or more information bits implicitly at the receiving device; determining an order of the different circular shifts of repeated blocks of data as a set of transmission parameters indicating the additional information, each circular shift shifting bits differently, and wherein the set of transmission parameters is associated with the additional information and determined from a plurality of sets of transmission parameters; wherein the order is determined as said certain order; wherein the repeated block of data is repeated 7 times in the first time division multiple access, TDMA, frames of each of 4 consecutive 51-multiframes of the TDMA frames and a different circular shift is applied to the repeated blocks of data depending on which 51-multiframe is being transmitted, whereby the additional information consists of 2 bits that are transmitted using said determined order of 4 different circular shifts, and the additional information is indicated by how said 4 different circular shifts map to said four consecutive 51-multiframes; and transmitting 4 consecutive 51-multiframes of the TDMA frames to the receiving device using the determined set of transmission parameters, thereby indicating the additional information to the receiving device; wherein the information refers to the repeated blocks of data interleaved using the different circular shifts.