A method for using channels in a time-division multiple access (TDMA) radio system which comprises at least one base station (10) and at least one mobile station (11) and which operates on one or more carrier frequencies per base station (10), the carrier frequencies being divided into a plural number of physical channels comprising time slots, a predetermined number of time slots forming a frame, and in which system one of the base station's (10) carriers is a main carrier on which a main control channel (MCCH) operates, at least one physical channel of the main carrier being used for transmitting broadcast control channels (BCCH) and the last one of said at least one physical channel being allocated to a traffic channel (TCH) only if the base station (10) does not have other physical channels available.
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