Anti-collision Research In RFID System Based On Double TDMA

RFID is the hottest non-contact communication technology in the Internet of things,itidentify targets by the RF signal automatic.Application of RFID affected by manyuncertain factors,One of the most important is the channel conflict.It is the tag collisionthat we often said.In order to solve this problem, researchers have put forward many waysbased on the ALOHA and the binary algorithm.In order to solve this problems, proposed a new mechanism based on the doubleTDMA.Besides the time slice competition mechanism increase the frame random numbersas the time slot selection criteria to make the time slot selection more flexible and moreaccurate and reduce the collision probability of tags,and controlling channel by settingsthe threshold to estimate the amount of the labels and change the strategy dynamic.In order to meet the demand of the system,design the rules of tag communication andstate transition and increased the commands of reduce and retreat.Through experiment andsimulate different environment of labels to verify the efficiency of the algorithm.Theseimprovement strategy effectively solves the common problems in anti collision algorithm,and can flexibly adapt to the different environment, significantly increase the throughputrate of the RFID system.The throughput rate of D-TDMA anti-collision mechanism is depends mainly on thethreshold choice, and increase of the number of tags will not affect its efficiency that otheralgorithms can not do,so it has the wider application.