bands according to a still further embodiment of the invention maximum transmission powers in different frequency bands are controlled by storing predetermined offset values in a mobile station and transmitting an indication from the network to the mobile station that these offset values are to be applied as a response to reception of said indication it is possible to determine the maximum transmission power in a frequency band on the basis of a maximum transmission power parameter for a predetermined frequency band such as for example the ms_txpwr_max_cch or gprs_ms_txpwr_max_cch parameter and the offset value corresponding to the frequency band the transmission power parameter may be defined as for specific predetermined frequency bands a frequency band specific offset to this value may then be applied to other bands this embodiment has advantage in that the indication that the offset values are to be applied can be as simple as a one bit flag transmitted from the base station to the mobile station because of this the implementation of this embodiment adds very little load on the air interface the above described embodiments provide several advantages accurate control of maximum output power on a common bcch cell may be allowed the behaviour of legacy terminals can be maintained as optimal as possible the link budget properties of different bands can be taken into account without having a specific maximum output power parameter defined for each band separately the number of bits used for signalling can be kept low it is noted that while the preceding description illustrates various embodiments of the invention with reference to cellular telecommunications systems such as the gsm.