优化的动态帧时隙ALOHA防碰撞算法

对动态帧时隙ALOHA防碰撞算法中的标签个数估计进行改进,采用动态调整机制,使标签个数估计式系数自动调整,解决阅读器下一个查询周期应该使用的帧时隙长度的问题。针对实测中当帧长度与标签个数相等时冲突率较高的问题,将查询命令时间计入总的帧长度中以优化帧长度。仿真结果表明,优化后的DFSA算法延迟时间减少,冲突率降低,系统效率提高,在标签数量较少时效果尤为明显。

Optimized dynamic framed slotted ALOHA anti-collision algorithm

To improved the estimate of the number of tags in the dynamic framed slotted ALOHA anti-collision algorithm, using dynamic adjustment mechanism to automatically adjust the formula coefficient of estimate of the number of tags, solved the problem of the length of the frame slot which the reader should be used in the next polling cycle. For the problem of higher collision rate when the frame length equal to the number of tags, It optimized the frame length by including the query command time in the total frame time. The simulation results show that the optimized DFSA algorithm total delay time and the collision rate reduced, system efficiency improved, especially in the number of tags are less.