Tweaked query tree algorithm to cope with capture effect and detection error in RFID systems

In this paper, we propose a new Query Tree-based identification algorithm, namely, Tweaked Query Tree (TQT), to cope with hidden or missing tags caused by both Capture Effect and Detection Error phenomena in RFID systems. The whole identification process is divided into several query cycles, where hidden tags in a cycle re-transmit in the first query of the next one. The average number of time slots to successfully detect one tag and the tag loss rate defined as the ratio between the number of missing tags and the total number of tags, are evaluated by computer simulations. Obtained results show that the proposed TQT much more effectively solves the hidden tags problem in comparison with conventional methods.