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The ability to recognize many tags simultaneously is crucial for many advanced RFID-based applications. The tag anti-collision algorithm of an RFID system, which arbitrates collisions on the air interface among tags in the same reading range of a reader, makes a great influence on the speed and the reliability in multiple tag recognition. This paper presents a new memoryless tag anti-collision algorithm, QT-CBP (Query Tree with Collision Bit Positioning), which is designed based on QT (Query Tree) algorithm. QT-CBP is likely to make more concise tree traversal than QT by extracting and making use of detailed information on a collision condition, such as the number of collision bits and their positions. Basically QT-CBP is an enhanced algorithm for readers running QT, so no change is required at tags. Simulation study shows that QT-CBP outperforms QT, especially on the condition where tags have similar tag IDs by having the same company or product ID prefixes.

QT-CBP: A New RFID Tag Anti-collision Algorithm Using Collision Bit Positioning