Research And Application Of RFID Tag Anti-collision Model

Radio frequency identification technology is a new type of automatic identification technology that emerged at the end of the last century,which is different from traditional barcode technology.It can realize real-time non-contact identification of objects to be identified.In recent years,with the development of the Internet of Things,more application scenarios have been provided for the application of RFID,and the application advantages of RFID have also been highlighted.However,until today,the development of RFID is still not perfect.There are still a series of problems in the use of RFID,such as the collision problem of tag identification,the collision problem of readers and so on.These problems will reduce the efficiency of the RFID system and limit the development of RFID technology.Electronic tags and readers form a common RFID system.Electronic tags and readers communicate through a shared wireless channel to complete data exchange.During the tag identification process,if a large number of tags communicate with the reader at the same time,the tag and the reader will not be able to exchange data,causing tag collision problems,and the tag will not be successfully read by the reader.A large number of collisions of tags will quickly reduce the performance of the RFID system,resulting in a large number of tags that cannot be identified.Therefore,studying the anti-collision problem of tags has important practical application value.In practical scenarios such as airport baggage sorting,high-speed ETC charging,and logistics,RFID systems for tag movement are more common.In these scenarios,the existing anti-collision algorithm is not applicable,because due to the mobility of the tag,the tag will be lost,that is,the tag has left the recognition area before being recognized by the reader.This article mainly conducts in-depth research on this dynamic scene.The research focus and innovation mainly include the following two parts:Combined with the Q value algorithm,a FCFS-Q protocol suitable for dynamic RFID scenarios is proposed.Compare the difference between the static RFID system and the dynamic RFID system,analyze the RFID system of the tag movement,explain the characteristics and existing problems of the system,explain the common post-random identification phenomenon of the tags in the dynamic system,and introduce the existing problems First come first serve mechanism.Finally,combined with the Q-value algorithm,the FCFS-Q protocol suitable for the above scenarios is proposed.The label loss rate is used as a measurement standard.MATLAB software is used for simulation experiments and the experimental results are analyzed.The results show that the proposed FCFS-Q protocol is compared with the traditional algorithm.In comparison,in a dynamic RFID system with tag movement,it can reduce tag loss and improve the system's recognition rate.A new frame length adjustment method is proposed for the Q value algorithm of the EPC global standard and applied in the traceability system of agricultural products.The label estimation process is only carried out at the end of the first frame of the system,and then the difference between the number of unidentified labels calculated by the label estimation algorithm and the number of successfully recognized labels in the first frame is used as the frame length of the new round of the system.Taking Xinyang Maojian as an example,the proposed algorithm was simulated in the storage link to analyze the feasibility and performance of the algorithm.Simulation experiments show that the proposed algorithm can meet the requirements of the traceability system for mass label identification in terms of throughput and time delay.