| 摘要 |
<p>PROBLEM TO BE SOLVED: To make communication between a radio master station and plural radio slave stations with excellent efficiency reliably. SOLUTION: A radio relay center S1 in a network of a radio master station M receives refresh data to radio slave stations S3 to S5 from the station M and, as substitute for the master station, performs refresh of the stations S3 to S5 in a network of a self-station by using the refresh data. During the time, refresh is cyclically continued with the other radio slave stations S2 and S6 to S8 in the network of the station M.</p> |
