Distance Based Optimization for Eliminating Redundant Readers in RFID Networks

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The RFID (Radio Frequency Identification) have been developed and promoted rapidly for the past few years. The researches and discussions mainly focus on preventing collisions of RFID and removing redundant RFID readers. Different methods have been proposed by researchers in order to solve the two issues effectively. In this thesis, the Distance Based Optimization for Eliminating Redundant Readers (DBO) method that we proposed, the distance between RFID readers is used as parameter for removing redundant RFID readers. The maximum waste RFID readers can be identified and maximum redundant RFID readers can be removed by using the DBO method. The optimized coverage range of RFID is retained also. The DBO method is based on Layered Optimization Approach for Redundant Reader Elimination in Wireless RFID Networks (LEO) [8]; however, the LEO method is improved and optimized by the DBO method. The I/O of RFID tags is reduced vastly. Neither the communication nor the synchronization between RFID readers is needed. The local information and client-server architecture are not needed anymore. In order to evaluate the result of our method, we established an experiment to compare with other methods. The experiment result shows that our method is very effective on identifying and removing the redundant RFID readers.