| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a master station device of a plurality of district broadcast systems, installed in respective districts, to recognize whether or not notification data is surely received, which has not been possible in the conventional broadcast radio system in which a master station transmits notification data to the plurality of district broadcast systems.SOLUTION: A communication system includes: a first master station that transmits the notification data by radio; and a plurality of second master stations for other systems that receive the notification data transmitted from the first master station. The second master station transmits the received notification data to sub-stations. The first master station transmits reservation broadcast including the notification data and a broadcast time. On receiving the reservation broadcast, a second master station confirms the content of the reservation broadcast with a second master station for another system.</p> |
