| 摘要 |
<P>PROBLEM TO BE SOLVED: To simplify slot setting work at initial setting when performing communication with a wireless tag by a time-division multiple access using a common wireless communication band between respective sensors, in a wireless authentication system where a plurality of the sensors are arranged along moving space of a detection object so as to partially overlap the detection object areas between the adjacent sensors to detect movement of the detection object by communication between the wireless tag carried by the detection object and any one of the sensors. <P>SOLUTION: A wireless authentication system provides an automatic setting to prevent the same slot from being used between adjacent sensors by sequentially notifying any of sensors from an upstream side sensor S1 to a downstream side sensor S4 of a slot occupied by the sensor itself and occupying an open slot for the sensor which has received a notification. The notification can be surely implemented without a collision by sending back a collision detection notification when the collision of the notification is detected and re-sending a notification of a slot in use after a carrier sense is performed when the collision detection notification is received. <P>COPYRIGHT: (C)2012,JPO&INPIT |
