Research On RFID Anti-collision Method Based On Dynamic Check Point And Tag Estimation

In the system with radio frequency identification(RFID)technology,when multiple tags simultaneously send information to the reader,problems affecting the efficiency of the system will arise.These problems may be signal collision,increasing identification time,lower tag recognition rate and system throughout.In order to solve the collision problem of tags,many anti-collision algorithms have been proposed,among which how to get optimal frame and estimate the number of tags accurately are the research focus of the algorithms.A method of frame size adjustment based on dynamic check points is proposed in this paper to solve the problem caused by the fixed position of the check point.To obtain the number of time slots that can represent the distribution of tags in the whole frame,the sample size is used to calculate the size of the check slots area in the frame.Based on the above,the position of the check point that is adjusted with the frame length dynamically in the frame is determined.The simulation results show that the dynamic check point method has a better advantage in adjusting the frame length than fixed check point method.Suitable frame length can improve the system throughput and tag recognition rate.To the problem of inaccurate tag estimation caused by actual time slot duration,a tag estimation method based on the slot duration is proposed.The simulation results show that the improved tag estimation method has better estimation accuracy.A RFID tag anti-collision algorithm combined the frame length adjustment method based on dynamic check point and the tag estimation method based on slot duration is realized on the RFID anti-collision simulation platform.Compared with three existing RFID tag anti-collision algorithms,the algorithm proposed in this paper is better in the number of collisions and the throughput.