METHOD AND ARRANGEMENT FOR SYNCHRONIZING THE CARRIER FREQUENCIES OF A MOBILE UNIT WITH THE CARRIER FREQUENCIES OF A FIXED STATION

摘要

The invention concerns a method and a device for synchronising carrier frquencies (fx) in a mobile telephone (11) on carrier frequencies (fx) of a fixed station (1), for radio data transmission, said data being transmitted on several carrier frequencies. The fixed station (1) comprises a device (4) for transmitting a control signal, the control signal carrier frequency (fx) being changed from time to time. In the mobile telephone (11) is provided a device (5) sensing the transmission conditions succeeding one another for each of the plurality of carrier frequencies (fx). In the mobile telephone is further provided a device (16) adjusting the mobile telephone on reception of the carrier frequency (fx) offering the most favourable receiving conditions, until the fixed station (1) transmitting device (4) shifts the control signal carrier frequency (fx) to the carrier frequency (fx) on which the mobile telephone (11) is adjusted. In the fixed station (1) or the mobile telephone (11), devices (12, 13) transmit synchronising data from the fixed station (1) to the mobile telephone (11) and/or vice-versa.