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In 13.56MHz RFID system proposed by Auto-ID Center, STAC protocol is defined as an anticollision algorithm for multiple tag reading. In STAC protocol, the reader uses the tag number estimation scheme to determine the number of slots for the next reply round. If errors occur in the estimated number of tags, an identification performance will be degraded due to a lot of collision slots or idle slots. Therefore, in this paper, we propose a scheme that the reader cancels the reply round when it experiences a series of collision slots or idle slots during the current round. Through simulations, it is demonstrated that the collision rate for the proposed scheme is about 38% lower than STAC protocol. Therefore, the proposed scheme can achieve fast identification time compared with STAC protocol due to the low collision rate. Keywords—RFID, Anti-collision algorithm, STAC protocol, Multiple tag reading

Performance Analysis for Early Cancellation Scheme of Reply Round with Slot-Counter Update in STAC Protocol