A method for transmitting data in a communication system operating in the HF band comprising a link layer and a physical layer, said system comprising a transmitter and a receiver, said transmitter comprising at least one scheduler, the method is characterized in that the data streams are made up of non-time-constrained data streams G 1 and time-constrained data streams G 2 and in that it comprises at least the following steps: at the link layer level: • segmenting the data streams having compatible non-time-constrained characteristics G 1 into a plurality of blocks G 1A Bi, G 1B Bi, G 1C Bi, a sub-frame corresponding to a unitary cell for an ARQ retransmission process, then • preparing one or more data frames TG 1 by adding headers required for the format used for the transmission, • performing a coding of a data frame, taking into account a required service quality, the parameters of of the coding are adapted to the formatting of the frame, producing sub-frames STG 1Ac, STG 1Bc, STG 1cc, • segmenting the data streams having compatible time-constrained characteristics (420, 421) into a plurality of blocks G 2A Bi, G 2B Bi, • preparing one corresponding data frame TG 2 by adding a header, • performing a coding and interleaving of each frame TG 2Ac, TG 2B, then segmenting each frame to obtain sub-frames STG 2Ac, STG 2BC, • preparing the data of the frame PHY to be transmitted from the sub-frames resulting from the segmentation steps, • preparing (416, 426) a plurality of frames T 3 G by mixing the sub-frames obtained from the non-contrained stream G 1 and from the constrained stream G 2, namely the sub-frames STG 1Ac, STG 1Bc, STG 1cc, STG 2Ac, STG 2B, at the physical layer level: • transmitting the frames T 3 G. at the link layer level: • segmenting the data streams having compatible non-time-constrained characteristics G 1 into a plurality of blocks G 1A Bi, G 1B Bi, G 1C Bi, a sub-frame corresponding to a unitary cell for an ARQ retransmission process, then • preparing one or more data frames TG 1 by adding headers required for the format used for the transmission, • performing a coding of a data frame, taking into account a required service quality, the parameters of of the coding are adapted to the formatting of the frame, producing sub-frames STG 1Ac, STG 1Bc, STG 1cc, • segmenting the data streams having compatible time-constrained characteristics (420, 421) into a plurality of blocks G 2A Bi, G 2B Bi, • preparing one corresponding data frame TG 2 by adding a header, • performing a coding and interleaving of each frame TG 2Ac, TG 2B, then segmenting each frame to obtain sub-frames STG 2Ac, STG 2BC, • preparing the data of the frame PHY to be transmitted from the sub-frames resulting from the segmentation steps, • preparing (416, 426) a plurality of frames T 3 G by mixing the sub-frames obtained from the non-contrained stream G 1 and from the constrained stream G 2, namely the sub-frames STG 1Ac, STG 1Bc, STG 1cc, STG 2Ac, STG 2B, • segmenting the data streams having compatible non-time-constrained characteristics G 1 into a plurality of blocks G 1A Bi, G 1B Bi, G 1C Bi, a sub-frame corresponding to a unitary cell for an ARQ retransmission process, then • preparing one or more data frames TG 1 by adding headers required for the format used for the transmission, • performing a coding of a data frame, taking into account a required service quality, the parameters of of the coding are adapted to the formatting of the frame, producing sub-frames STG 1Ac, STG 1Bc, STG 1cc, • segmenting the data streams having compatible time-constrained characteristics (420, 421) into a plurality of blocks G 2A Bi, G 2B Bi, • preparing one corresponding data frame TG 2 by adding a header, • performing a coding and interleaving of each frame TG 2Ac, TG 2B, then segmenting each frame to obtain sub-frames STG 2Ac, STG 2BC, • preparing the data of the frame PHY to be transmitted from the sub-frames resulting from the segmentation steps, • preparing (416, 426) a plurality of frames T 3 G by mixing the sub-frames obtained from the non-contrained stream G 1 and from the constrained stream G 2, namely the sub-frames STG 1Ac, STG 1Bc, STG 1cc, STG 2Ac, STG 2B, at the physical layer level: • transmitting the frames T 3 G. • transmitting the frames T 3 G.