Anti-Collision Algorithm of Splitting Tags in RFID Systems

Nowadays, the RFID system has been gradually applied in many fields. The RFID system comprises interrogators and tags. A interrogator communicates with tags through a shared wireless channel. Because the tags can not recognize between their each others, when more than one tag transmits their data to the interrogator at the same times, the mixing signals lead to collide and the interrogator can not identify what it received. Therefore the tag collision is a serious problem in the identifying process. Generally the RFID systems implement two kind of anti-collision method, one is binary-tree algorithm and the other is AIOHA algorithm. These two methods are simple and feasible, but spent much time. This paper presents a new method using the information stored in the tags to split tags and drop the colliding probability and improve efficiency of identification process.