The invention relates to a method for data communication between communication participants. The method includes observing the surroundings of the transmitting participant (202), determining the position and motion of the communication participants (203), and estimating the transmission conditions at a later point in time (204). The solution is based on classifying the data for data communicationin different categories, the categories determining susceptibility of the data to transmission errors determining which data is transmitted under good transmission conditions only and which data is betransmitted under rough transmission conditions whereby the transmission station plans the transmission of data in different categories. The method further includes selecting for data transmission ata given time for which the transmission conditions have been estimated so the data to be transmitted is in a category fitting to the estimated transmission conditions based on the categories data (205), and transmitting the selected data (207).