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Abstract

A radio communication apparatus includes a device for sequentially discriminating whether or not different frequency channels are open or occupied and generating channel-condition signals representative thereof during each of cycles of a channel scan. The channel-condition signals correspond to the channels respectively. A device holds the channel-condition signals and thereafter outputs the channel-condition signals. A device detects a variation between a current channel-condition signal and a preceding channel-condition signal in respect of each of the channels. The current channel-condition signal is currently generated by the discriminating device. The preceding channel-condition signal is outputted from the holding device. A device detects whether or not a given identification signal is present in the channel where the detected variation occurs.

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First Claim