基于判决门限的RFID防碰撞Q值算法

Decision Threshold-based Q Algorithm for RFID Anti-collision

标签的识别速度是RFID技术高强度、大规模应用的关键。为了提高射频标签的识别速度,提出了一种基于判决门限的防碰撞算法——QA-DTCI,详细阐述了算法的思想、运算流程和门限阈值的确定方法。在QA-DTCI算法中,读写器增加了两个计数器来分别计算碰撞和空闲时隙的个数,单独处理空闲时隙和碰撞时隙。当检测到碰撞时隙时,碰撞计数器自增;当检测到空闲时隙时,空闲计数器自增;同时对空闲计数器与碰撞计数器进行差值运算并与预设定的门限阈值比较,从而动态调整Q值。仿真结果表明,与QA算法相比,QA-DTCI算法在不损耗系统吞吐率的情况下,识别时延最大缩短了4%、识别速度提高了10%。

One of the hotest research topics in RFID technology is the speed of tag identification, which is the key to wide and large-scale application. Thereby this may increase the system identification of the time overhead. To increase the speed of tag identification, the article proposed the decision threshold based anti-collision algorithm--QA-DTCI al- gorithm,and elaborated the concept of the algorithm, the process of operation and the determination method of thresh- hold parameters. In this algorithm, every reader is added with two counters to calculate the number of collisions and the idle slots respectively. When a collision slot is detected, the collision counter will increase , while when an idle slot is de- tected, the idle counter will increase as well. Comparing the subtraction of collision counter and idle counter aganst the setting threshold,it＇s can adiust the Q dynamically. The simulation results prove that the proposed algorithm can not only shorten the identificaton delay by maximum 4% but also increase the identificaton speed by 10%, without affecting the the system throughput.