| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a radio communication method capable of making a communication while imposing restrictions so that communication from one radio communication device to only a communication party present in a designated region except a certain nearby region is established. <P>SOLUTION: A distance measuring function of a UWB (Ultra Wideband) radio communication device is used to detect the distance to the other radio communication device, and limit transmission output right before packet exchange with the other radio communication device is disabled at the distance is found and held. The distance is varied sequentially in steps thereafter to generate a data table of distance-to-limit transmission output data. A radio communication device present in a region that a user selects out of a plurality regions having borders in the steps of distances in the data table is detected and selectively registered to allow the communication with only the registered device. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
