| 摘要 |
The network system includes a controller ( 10 ) and a plurality of terminals ( 20 ). The controller ( 20 ) repeats transmitting a request signal ( 40 ) indicative of a predetermined probability. Upon receiving the request signal ( 40 ), the terminal ( 20 ) sends, at the probability indicated by the request signal ( 40 ), a response signal ( 50 ) including the identification information uniquely allocated to the terminal ( 20 ). Upon receiving the response signal ( 50 ), the controller ( 10 ) sends a notification signal ( 60 ) with reference to the identification information included in the response signal ( 50 ). The terminal ( 20 ) judges whether or not a response has been completed, on the basis of the received notification signal ( 60 ). The terminal ( 20 ) sends no response signal ( 50 ) in response to receiving the request signal ( 40 ) once after judging that the response has been completed. The controller ( 10 ) prepares the next request signal ( 40 ) indicative of the probability not less than that indicated by the previous request signal ( 40 ). |
