RFID系统中改进的动态帧时隙ALOHA算法

Enhanced Dynamic Framed Slotted ALOHA in RFID System

在RFID系统中,多标签引起的冲突一直是影响系统性能的问题。ALOHA算法是运用比较普遍的一种防冲突算法,在标签数目较少的情况下,现有的ALOHA算法也有较高的效率,但是随着标签数目的急剧增加,算法时间也成指数增长,本文提出一种改进的ALOHA算法,在标签总数未知的情况下,可以动态改变帧宽度,同时对标签进行分组,从而获得较高的系统效率。

In RFID system,one of the problems is the collision between tags,which lowers the efficiency of the system.ALOHA is a popular anti-collision algorithm.When the number of tags is fewer,it has well effectively.However,as the number of tag increases,the required computing time increases rapidly.In this paper,an enhanced method is proposed,which can groupi the tags,at the same time adjust the frame size dynamically,so that it can derive a higher system efficiency in the case of the label under the total number of unknown.