摘要
在已有RFID标签防碰撞ALOHA算法基础上,提出了一种改进的带中断机制的动态帧时隙ALOHA（ⅡDFSA）算法,一方面通过优化设置系统效率临界因子和参考碰撞时空比,比较系统效率判断是否改变帧的大小;另一方面通过比较碰撞时空比来判断帧大小的改变方向,从而有效降低标签识别时间,提高识别效率。计算机仿真结果表明,与传统的动态帧时隙ALOHA算法相比,当标签数低于200和高于800时,采用ⅡDFSA算法可以有效降低系统总识别时间,提高系统效率。当标签数介于200~800之间时,与传统的动态帧时隙ALOHA算法相当。
In the paper, an Improved Dynamic Frame-Slotted ALOHA algorithm with Interrupt Mechanism（Ⅱ DFSA）was brought forward based on the previously reported ALOHA algorithms. The proposed Ⅱ DFSA can be realized as follows. Firstly, the reference system efficiency and ratio of the collision to empty slots have been optimized and then the frame size is adjusted by comparing the system efficiency with the reference system efficiency. On the other hand, the change direction of the frame size is determined by the ratio of the collision to empty slots. Thus, the proposed Ⅱ DFSA is helpful to effectively reduce the recognition time and improve the system efficiency. Results obtained through computer simulation indicate that Ⅱ DFSA algorithm can effectively decrease the total recognition time and improve the system efficiency when the tag number less than 200 or more than 800 by comparing with the traditional DFSA and Ⅰ DFSA, and the system efficiency of the proposed Ⅱ DFSA is not worse than those of them while the tag number drops in between 200 and 800.
出处
《电子与封装》
2015年第3期18-21,48,共5页
Electronics & Packaging
基金
浙江省智慧城市中心暨企业研究院人才培养项目(GK130902299002/007)
