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In an RFID system, the tag-to-reader signal collision may induce longer transmission delay and higher communication overhead while a reader intend to identify all existing tags at the same time. The issue of designing an efficient anti-collision scheme for RFID systems has been promptly focused by research community and scholars in recent years. In this paper, we present an RFID anti-collision protocol, called adaptive delay splitting (ADS), which adopts two new concepts, the collision prediction technique and the queuing technique, to raise the system efficiency on tag identification. The simulation results show that ADS significantly outperforms two ALOHA-based anticollision schemes, i.e. Q-algorithm and ABS, in terms of signal transmission delay and data communication overhead.