基于CSMA/CD改进的混合RFID防碰撞算法  

An Improved Hybrid RFID Anti-collision Algorithm Based on CSMA/CD

作　　者：姜志峰 云中华[1] 朱利娟 陈夫桂[1] 

机构地区：[1]西藏大学,西藏拉萨850012

出　　处：《计算机技术与发展》2018年第3期78-82,共5页Computer Technology and Development

基　　金：西藏自治区高校青年教师创新支持计划项目(QCZ2016-26);西藏自治区自然科学基金(2016ZR-15-8);西藏大学青年科研培育基金项目(ZDPJZK1508);西藏大学大学生创新训练项目(2016QCX038)

摘　　要：随着射频识别技术在日常生活中的广泛应用,提高RFID系统的识别效率,成为一个急需解决的问题。RFID系统运行时,读写器查询阅读区域内的电子标签,当存在多个电子标签同时做出应答响应时,会发生不同层次的标签碰撞。为解决这一问题,在ALOHA算法的基础上提出了一种基于CSMA/CD改进的混合RFID防碰撞算法。首先由时隙ALOHA算法完成首次识别,剩余未成功识别的标签通过借鉴有线以太网中的协议思想,应用于无线收发领域。即由载波监听/冲突检测机制和截断二进制指数退避算法完成二次重传,但需要增加硬件装置来发射干扰信号,加强标签碰撞。一旦被成功识别,就立即从后端服务器中检索对应的标签信息。仿真结果表明,改进算法有效缩短了标签识别时间,提高了标签识别效率。With the extensive application of radio frequency identification technology in the daily life,it is an urgent problem to improve the efficiency of identification for RFID system.When RFID system is running,the reader queries the electronic tag in the reading area.When there are multiple electronic tags at the same time to respond,the tag collision with different levels will occur.In order to solve this problem,we propose an improved hybrid RFID anti-collision algorithm based on CSMA/CD in according with ALOHA.First the first identification is completed by the time slot ALOHA,and the remaining tags of unsuccessful identification are applied to the wireless transceiver according to the ideas from cable Ethernet protocol.It means the second retransmission is achieved by the carrier monitoring/collision detection mechanism and truncated binary index backoff algorithm,but needed to increase the hardware to launch the interference signal for the tag collision enhancement. Once successfully identified,the corresponding tag information is immediately retrieved from the back-end server.The simulation shows that the improved algorithm can effectively shorten the recognition time and improve the efficiency of tag recognition.

关 键 词：无线射频识别 首次识别 CSMA/CD 二次重传 服务器 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]