QUERY TREE BASED TAG IDENTIFICATION METHOD IN RFID SYSTEMS

摘要

A query tree-based tag identification method in an RFID(Radio Frequency IDentification) system is provided to enable the RFID system to identify tags at high-speed by offering a high performance anti-collision protocol while being implemented through fusion of characteristics of two protocols having limitation. A reader generates a temporary ID corresponding to each tag after initialization. If a query is received from the reader, the tag compares a specific bit of the received query with the specific bit of the temporary ID. If both specific IDs are matched with each other, the rest bits of the temporary ID are transmitted to the reader. If collision is generated, the query generating the collision is stored to the reader. If the collision is not generated, the reader transmits an acknowledge signal to the corresponding tag by identifying one temporary ID. Previous steps are repeatedly performed until the query is removed from a memory of the reader.