| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To execute control for suppressing the mutual interference of transmission signals by the communication of a plurality of RFID tag communication devices, and to perform stable communication, in a system operated by using the plurality of RFID tag communication devices which are radio equipment for identifying a mobile object. <P>SOLUTION: The RFID tag communication device monitors reception signals even while sending out the transmission signals, and determines that another RFID tag communication device is performing transmission when it is observed that the level fluctuation of the reception signals is high in a transmission period during which the level fluctuation of its own transmission signals is low. Then, when detecting the level fluctuation higher than a prescribed level in the reception signals, the transmission signals are stopped before the RFID tag communication device shifts to the period of returning the response of back scatter signals. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
