2 Conditional tag estimation method for DFSA algorithms in RFID systems

Radio Frequency Identification system has some critical issues like tag collision and reader collision. Dynamic Framed Slotted Aloha is one of popular algorithms which is proposed to address tag collision issue in RFID. This method needs to guess the number of tags in each identification cycle to gain its best performance. So in this paper we propose a novel tag estimation method which is comprises 2 parts. First we calculate the optimal percentage of collision and free slots then we change the frame size according to difference between the real number of collision and free slots and optimal number of collision and free slots. At the end we evaluate our method and compare it with other proposed methods to prove its efficiency.