erl no m99 40 university of calif berkley usa jul 1999 are calculated from fig6 the transmission of information via the wcdma wideband code division multiple access air interface in the mobile radio communications standard utran fdd universal terrestrial radio access network frequency division duplex occurs in time frames with a duration of 10 ms see for example h holma and a toskala wcdma for umts john wiley amp sons chichester uk 2000 isbn 0 471 72051 8 the process corresponding to the invention with the cycle 11 shown in fig2 is in turn used for controlling the sequence of a time discrete system simulation according to the utran fdd mobile radio communications standard nevertheless with a wcdma air interface a rapid power control is indispensable for an efficient mode of operation of the air interface itself see for example h holma and a toskala wcdma for umts john wiley amp sons chichester uk 2000 isbn 0 471 72051 8 this rapid power control works in utran fedd 15 times faster than the change of time frames in other words 15 times the transmission power is adjusted to the radio communication stations per time frame however the adjustment of the transmission only concerns the cycle increments 12 3 4 and 5 of the cycle 11 shown in fig2 these three reception time points would therefore have to be processed 15 times within the cycle 11 in order to control a time discrete system simulation of a radio communications access network according to the utran fdd mobile.