Layer two compression/decompression in a cellular communications network

A device (5) is dedicated to the compression of data contained in input frames consisting of flow frames, defining portions of TRAU frames and signaling frames to be transmitted within a communications network and each consisting of at least one header comprising control data representative at least of the type of flow frame and any useful data, certain types comprising critical and / or non-critical data. The compression device (5) comprises analysis means (7) responsible for analyzing each TRAU or signal header contained in successively received input frames, in order to determine its type, and compression means ( 8) responsible for periodically generating compressed frames to be transmitted,