基于不完全微分模糊-PID的主动队列管理算法研究

Research of an active queue management algorithm based on incomplete derivation Fuzzy-PID

主动队列管理(AQM)作为一种重要的IP层网络拥塞控制策略,对于Internet服务质量的提高起着至关重要的作用。文章介绍了AQM算法的研究现状,分析了AQM中的PID算法,并用不完全微分和模糊的方法改进了PID算法,得到一种不完全微分模糊-PID控制器。与常规的算法相比,该算法能够有效地抑制高频噪声,改善了系统的动态性能。仿真结果表明,该算法能更好地改善系统的动态特性。

Active queue management （ AQM ）, as an important strategy in network congestion control of IP layer, is vital for the improvement of QoS.The status of AQM algorithm is elaborated and the PID algorithm in AQM is analyzed in details.An incomplete derivation Fuzzy-PID controller that is developed from general PID algorithm by the method of incomplete derivation and fuzziness is also designed.Compared with general PID, this algorithm can not only eliminate high frequency noise, but also be able to improve the dynamic state property of the system.Simulation results have shown that this algorithm can improve the dynamic state property better.