FIELD: information technology.;SUBSTANCE: computing device operating according to a frequency division multiplexed protocol in which communication occurs over a signal formed from a plurality of sub-channels selected from anywhere in a frequency spectrum. The device retrieves from storage an indication of sub-channels previously selected; selects a first plurality of selected sub-channels to carry a signal, wherein selecting the first plurality of selected sub-channels comprises preferentially selecting a sub-channel when the indication indicates that the sub-channel was previously selected for carrying a previous signal transmitted by the computing device prior to the selection of the first plurality of selected sub-channels; after which the signal is transmitted using the first plurality of selected sub-channels.;EFFECT: improved wireless and line communication between computing devices using a set of selected sub-channels.;20 cl, 6 dwg
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