A method and an arrangement are disclosed for implementing fast signalling
in a communication connection between a base station and a mobile station
of a cellular radio network. There is defined an arrangement of
repeatedly occurring frames that consist of pieces of allocatable radio
communication capacity between the base station and mobile stations
communicating therewith. Pieces of radio communication capacity are
allocated from the arrangement of repeatedly occurring frames to
dedicated communication channels. A certain piece of radio communication
capacity is allocated from the arrangement of repeatedly occurring frames
to a non-dedicated fast signalling channel between the mobile stations
and the base station. This piece of radio communication capacity
allocated to a non-dedicated fast signalling channel is used for
conveying fast signalling messages between at least one mobile station
and the base station.