摘要
EPCglobal组织发布的第二代超高频射频识别空中接口协议EPC-C1G2协议可同时识别多个标签,该协议采用时槽ALOHA算法来解决多标签识别时产生的碰撞问题。文章首先介绍了EPC-C1G2协议多标签碰撞解决所需的参数和命令,指出协议中的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点。文中同时给出了一种动态Q值算法,该算法可根据标签碰撞解决的实际情况动态调整Q值,使标签识别更高效。文章最后对这种多标签识别流程的性能进行了仿真分析。
The EPC-C1G2 protocol published by EPCglobal is the second-generation standard of UHF RFID air interface. The slotted ALOHA algorithm is used to solve the collision problem in the multi-tag identification. At first, the commands and parameters of multi-tag anti-collision of this protocol are introduced. The Q value of protocol determines the slot count of anti-collision algorithm, The amount of time slot is larger, the tags are not easier to collide, but the time of all tags recognition becomes longer. The Q value is properly selected so that the best point between the identification time and the number of tags can be found. Then the processes of anti-collision or dynamic Q algorithm is described. Also the performance of these processes are simulated and analyzed.
出处
《物联网技术》
2012年第10期35-37,共3页
Internet of things technologies
关键词
超高频
射频识别
防碰撞算法
电子标签
读写器
ultra-high frequency （UHF）
radio-frequency identification （RFID）
anti-collision algorithm
electronic tag
reader
