| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve communication reliability to communication failure in a communication system which requires predetermined transmission dead time in addition to predetermined transmission allocation time.SOLUTION: The radio disaster prevention system comprises: plural radio sensors 16-11 to 34; plural radio wave relay tools 14-1 to 3; plural radio reception relay tools 12-1 to 3; and a receiver 10. When the radio sensor 16-11 transmits a radio signal to the radio wave relay tool 14-1, the radio sensor 16-11 transmits the radio signal by a predetermined first channel frequency within transmission allocation time, and then completes transmission normally when the radio sensor 16-11 receives a confirmation response radio signal from the radio reception relay tool 12-1, and when the radio sensor 16-11 does not receive the confirmation response radio signal from the radio reception relay tool 12-1, the radio sensor 16-11 transmits the radio signal again after switching a channel frequency to a predetermined second channel frequency different from the first channel frequency until the confirmation response radio signal is received during a remaining time of the transmission allocation time.</p> |
