基于阅读器状态的功率控制防碰撞算法

Anti-collision algorithm for power control based on reader state

为解决射频识别系统中多阅读器场景存在的干扰问题,提出一种基于阅读器状态的功率控制防碰撞算法,根据状态调整功率,使更多的阅读器能工作在同一时隙。分析阅读器与标签之间的通信过程,说明功率控制的可行性;分析阅读器工作中的不同状态,对阅读器功率调整行为划分不同的情况,功率的调整分为小幅度、大幅度和回调3种方式,以此接近理想的功率;结合图论在时隙分组的情况下,对处于非当前时隙的阅读进行功率调整,使其能工作在当前时隙。实验结果表明,该算法的吞吐量优于Colorwave和基于图论的分时隙算法,有效提高了系统最大吞吐量。

To solve the interference problem of multi-reader in RFID system, a power control anti-collision algorithm based on reader state was proposed, which adjusted the power according to the state and enabled more readers to work in the same time slot. The communication process between reader and tag was analyzed, the feasibility of power control was illustrated. The different status in the work of reader was analyzed, reader behavior was divided into different power adjustments, and power adjustment was divided into small amplitude, large amplitude and callback in three ways, to get close to the ideal power. Graph theory was combined in the slot packet case, in the current slot reading power adjustment, so that it worked in the current time slot. Experimental results show that the throughput of the proposed algorithm is better than that of the Colorwave and the graph based slots algorithm, which can effectively improve the maximum throughput of the system.