| 摘要 |
<p>[PROBLEMS] To realize maximum communication range within a range in compliance with laws applied to respective geographical environments. [MEANS FOR SOLVING PROBLEMS] When controlling directivity of antenna elements (P0 to P6) of antennas (101A to F), step S210 calculates a communication range, step S220 sets a communication range limit value according to the position information, and step S225 compares the calculated communication range to the set communication range limit value. If the former is larger, control is made to set a value not greater than the limit value. If the former is smaller, control is made to set the limit value or a value in the vicinity of the limit value.</p> |
