FOD interval and thus FOD detection frequency may be further adapted based on power loss in the WLC system. If power loss of the WLC system is in a range which is considered safe, for example, under a threshold value arranged for it, a longer FOD interval may be used.

The FOD detection frequency and length of the interval between adjacent FODs may depend on the TX power, for example, linearly. Other possible scales for FOD detection frequency may be, for example, exponential change, logarithmic change or any other desired change. In these cases, the FOD detection frequency may be increased as a function of the TX power level value linearly, exponentially or logarithmically. It is also possible that the TX power is divided into a plurality of power level ranges, so that the FOD detection frequency is increased as a function of TX power level value progressively, step by step. Each range of TX power may correspond to a different FOD detection frequency and/or different length of FOD detection interval. Number of power level ranges can also be freely selected, as well as the durations of the FOD intervals. In addition, different ranges of power level may correspond to different FOD intervals. The TX power may be split, for example, in four so that the first power level range, e.g. 0 W-1 W, has a FOD detection interval of 10 seconds, the second power level range, e.g. 1 W-3 W, has a detection interval of 3 seconds, the third power level range, e.g. 3 W-5 W, has a detection interval of 1 seconds, and the last range, e.g. 5 W-10 W, of the TX power has a detection interval of 0.5 seconds.