transmit power of the circuit switched connection to the maximum transmit power for the mobile station 33 dbm the transmit power of the packet switched connection is correspondingly reduced to 27 2 dbm in order to maintain the average transmit power of the mobile station at 315 mw a method of power control according to embodiments of the present invention is illustrated in fig7 in step s 700 the mobile station receives a codec command from the base station in step s 702 the mobile station checks whether it is transmitting both a circuit switched and a packet switched connection if not the mobile station proceeds to step s 708 and implements the codec contained in the codec command if yes the method proceeds to step s 704 in which the mobile station checks whether the codec is one of the n lowest codec modes if not the method proceeds to step s 708 and implements the codec contained in the codec command if yes the mobile station prioritises the transmit power of the circuit switched connection increasing it to the maximum transmit power for the mobile station and reducing the transmit power of the packet switched connection so as to maintain the average transmit power.