摘要
EPC-C1G2协议属于EPCglobal组织发布的第二代超高频射频识别空中接口协议,该协议采用时槽ALOHA算法解决多标签识别时产生的碰撞问题。首先介绍了该协议多标签碰撞解决所需的参数和命令,协议中的Q值决定了解决碰撞时所用的时槽数。时槽数越多,标签越不容易碰撞,但识别时间却越长,因此,恰当地选择Q值可以在标签识别时间和识别标签数之间找到最佳平衡点。给出了两种碰撞解决流程,一种是固定Q值算法,另一种是递减Q值算法,并仿真分析了这两种多标签识别流程的性能。
EPC-C1G2 protocol is the secondary standard of UHF RFID air interface,which is published by EPCgloba. The slotted AI, OHA algorithm is used to solve the collision problem in the multi- tag inventory. At first, the commands and parameters of multi - tag anti - collision of this protocol are introduced. The Q value of protocol decides the slot count of anticollision algorithm. If the amount of slot is larger, the collision of tags becomes less happening, but the time of inventory all tags becomes longer. The Q value is properly selected so that the best point between the inventory time and the number of tags can be found. Then two processes of anti-collision ,Q algorithm and degressive Q algorithm are described. Also the performanee of these processes are simulated and analyzed.
出处
《现代电子技术》
2007年第19期4-6,共3页
Modern Electronics Technique
关键词
超高频
射频识别
电子产品码
标签
阅读器
Ultra - High Frequency（ UHF）
Radio - Frequency Identification （RFID）
electronic product code
tag
collisionarithmetic
