Abstract: One of hot research in RFID technology is Tag anti-collision algorithm,which is the key to high strength and large-scale application．Firstly,this paper analyzed the characteristics of the Q value adjustment algorithm recommended in the EPC-C1G2standard anti-collision mechanism．In order to solve the Q values adjusting algorithm problem,a new Q value of double parameter adjusting algorithm,called ODWQA algorithm,was proposed．The idea of algorithm,the process of operation and the key parameter determination method were introduced．In this algorithm,by splitting the single parameter c into two weight parameter c₁ and c₂ to deal with the case of collision and idle respectively so that the number of collision slots and idles slots can be controled．Followed by laboratory analysis,the value of the best weight parameters under different Q values was determined.Simulation results show that the proposed algorithm can not only decrease the number of collision slots but increase the system throughput and fewer time slots than previous work.

Key words: RFID,Anti-collision algorithm,EPC-C1G2,Q value