terminals communicates in the direction of the base station using bursty data traffic, [0021]FIG. 2B shows a mobile network, [0022] FIGS. 3A-3C are a flow chart showing a method of the invention, [0023]FIG. 4 schematically shows the channel division of the invention, [0024]FIG. 5 shows how the terminals are grouped on the basis of propagation losses, and [0025]FIG. 6 shows a preferable embodiment