Abstract: The RFID technology is one of the key technologies of the Internet of things which need to be studied. Based on our researches of the RFID technologies, a kind of new anti-collision approach based on AID (associated ID) has been put forward in this paper. As we know, the realization mechanism of anti-collision approach is between the tags with the memory and the memory-less tags. We propose a method to build the association between tags with memory, so that tags in a certain trigger condition can take the initiative to send their own ID.Tags use modulated binary pulse to send data to the reader. This approach is different from that with the memory-less tags. Because there exists association relationship between father-tag and son-tag, when it is applied to the multi-tree searching method that we have proposed, the advantage of this method is that a single communication can identify multiple tags at one time, which has greatly improved the identification efficiency. When the approach is applied to the uncertainty ALOHA algorithm, the reader can decide the location of the empty slots based on the position of the binary pulse, so the working reader can avoid the efficiency decreasing problem caused by reading empty slots. Due to no limit of ID length, experimental results of our simulations show that this approach can greatly decrease the probability of collision and improve the identification efficiency of the system during many kinds of its applications.

Key words: Internet of things (IOT), association, memory, conflict, identification, efficiency