Patent attributes
An adaptive channel selection method is disclosed, performed by an autonomous communications node for selecting one of a plurality of possible channels in an unlicensed spectrum band. The method comprises: (a) for each channel: (i) determining a first interference measure UiS for the channel based on received energy from one or more other nodes j using said channel; (ii) causing the or each other node j using said channel to transmit an echo signal and receiving the echo signal(s) at the first communications node; (iii) determining from the or each echo signal a second interference measure UiA; (iv) determining a third interference measure Ui based on a combination of the first and second interference measures; and (b) selecting a channel whose third interference measure meets a predetermined condition.
