1-4244-0697-8/07/.00 ©2007 IEEE. A New Collision Resolution Protocol for Mobile RFID Tags

Radio Frequency Identification (RFID) systems have been widely deployed for inventory management, per-sonal identification, and asset tracking. In such envi-ronments, RFID tags frequently move in and out of a reader’s interrogation zone. Consequently, it is neces-sary for a reader to keep track of all tags in its inter-rogation zone in a periodic manner. This requirement not only increases workload of a reader but also gener-ates large amount of traffic from a reader to a manage-ment server. In this paper, we propose a selective tag identification protocol which has two sub-frames: an identification frame and an access frame. The proposed protocol improves RFID tag identification performance by introducing a Frame Counter that enables readers to discriminate newly arriving tags and leaving tags. In addition, simulation results show that the proposed protocol reduces the amount of traffic from a reader to a management server by updating only the changes in tag population. 1