A ANTI-COLLISION METHOD FOR FAST RECOGNITION OF MULTIPLE RFID TAGS

摘要

An anti-collision method for increasing recognition speed of multiple RFID(Radio Frequency IDentification) tags is provided to realize the optimal recognition speed by restricting the number of response tags in a specific case. A reader transmits initial frame size information and a command signal requesting a response to all tags within coverage, and each tag sends the response by receiving a slot. The reader checks the slot causing tag collision from the response signal of the tags and estimates the number of the tags involved in the response within the coverage by using a tag count estimating algorithm. The reader determines the condition needing response tag restriction based on the estimated number of tags and the number of collided tags. In case of the tag restriction condition, the reader transmits the command signal including tag selection condition information to each tag and each tag fit for a tag selection condition sends the response.