| 摘要 |
PROBLEM TO BE SOLVED: To improve line quality and reduce interference noises in a network by reducing the number of unnecessary radio routes as much as possible. SOLUTION: Respective node devices 100a, 100b, 100c and 100d are respectively provided with radio equipment capable of individually establishing bindirectional radio channels with the facing node device. In the case of normal communication with no propagation path fault or the like, the respective node devices 100a, 100b, 100c and 100d respectively control the radio equipment of devices themselves so as to establish only radio channels 211, 212, 213 and 214. With this control, an active communication route 301 is established inside the ring and data sent from the node device 100a, for example, can be transmitted through the active communication route 301 in the order of node devices 100b, 100c, 100d and 100a. |
