CAJ | 학술논문

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。
재이유RFID표첨방팽당ALOHA산법기출상，제출료일충개진적대중단궤제적동태정시극ALOHA（ⅡDFSA）산법，일방면통과우화설치계통효솔림계인자화삼고팽당시공비，비교계통효솔판단시부개변정적대소；령일방면통과비교팽당시공비래판단정대소적개변방향，종이유효강저표첨식별시간，제고식별효솔。계산궤방진결과표명，여전통적동태정시극ALOHA산법상비，당표첨수저우200화고우800시，채용ⅡDFSA산법가이유효강저계통총식별시간，제고계통효솔。당표첨수개우200~800지간시，여전통적동태정시극ALOHA산법상당。
In the paper, an Improved Dynamic Frame-Slotted ALOHA algorithm with Interrupt Mechanism (ⅡDFSA)was brought forward based on the previously reported ALOHA algorithms. The proposedⅡDFSA can be realized as follows. Firstly, the reference system efifciency and ratio of the collision to empty slots have been optimized and then the frame size is adjusted by comparing the system efifciency with the reference system efifciency. On the other hand, the change direction of the frame size is determined by the ratio of the collision to empty slots. Thus, the proposedⅡDFSA is helpful to effectively reduce the recognition time and improve the system efficiency. Results obtained through computer simulation indicate thatⅡDFSA algorithm can effectively decrease the total recognition time and improve the system efifciency when the tag number less than 200 or more than 800 by comparing with the traditional DFSA andⅠDFSA, and the system efifciency of the proposedⅡDFSA is not worse than those of them while the tag number drops in between 200 and 800.