Patent ID: 8792533

Claim:
A semiconductor integrated circuit device for a radio communication terminal of a frequency hopping system to transmit/receive a packet by sequentially using a plurality of frequency channels, comprising: a hopping frequency decision unit which selects one frequency channel from among the plurality of frequency channels; a transmission unit which assigns packet data to the selected frequency channel to transmit it; a reception unit which receives the packet data of the selected frequency channel; and a control unit which makes the hopping frequency decision unit perform frequency hopping, first by deciding frequency channels to be used in response to channel qualities estimated by a predetermined method when the reception unit receives the packet data, secondly by assuming that the channel qualities are packet error rates, thirdly by comparing the packet error rates of frequency channels with one another, and fourthly by deciding frequency channels of predetermined number as channels to be used in descending order of channel qualities, wherein the packet error rate of each frequency channel is calculated based on the number of packet data reception operations conducted for each frequency channel and the number of packet errors.