Patent ID: 7079496

Claim:
A method for digital radio transmission of data between a fixed station and at least one mobile station at one of a number of carrier frequencies, said method comprising: transmitting data in a number of time slots using a time-division multiplex method, said data being transmitted in active time slots, wherein each of the active time slots is followed by an inactive time slot in which no data is transmitted, said inactive time slot having a time duration shorter than a time duration of an active time slot; and changing from a first carrier frequency to a second carrier frequency after a predetermined time period having an order of magnitude of one time slot, wherein changing from the first carrier frequency to the second carrier frequency is performed during the inactive time slot by a RF module, wherein a transmission frame has at least four active time slots for transmission from said fixed station to said mobile station and at least four time slots for transmitting from said mobile station to said fixed station.