This study proposes the design of a new variable structure proportional-integral (VSPI) controller, which combines the advantages of a proportional-integral (PI) controller with the more flexible variable structure (VS) controller for transmission control protocol (TCP) router-based active queue management (AQM) network systems. The objective of the proposed controller is to improve the performance of routers by reducing packet loss and queuing delay and increasing throughput. The performance of the VSPI controller is verified and compared with the PI controller using Network Simulator 2 (NS–2). The results demonstrate that the proposed controller is stable and robust under various scenarios and is a suitable design approach for TCP/AQM network systems. Moreover, the VSPI controller is flexible and easy to use owing to the trade-off between stability and performance of the AQM control system.

这项研究提出了一种新的可变结构比例积分（VSPI）控制器的设计，该控制器结合了比例积分（PI）控制器的优势和用于传输控制协议（TCP）路由器的更灵活的可变结构（VS）控制器，基于活动队列管理（AQM）的网络系统。提出的控制器的目的是通过减少数据包丢失和排队延迟以及增加吞吐量来提高路由器的性能。使用网络模拟器2（NS-2）对VSPI控制器的性能进行了验证，并将其与PI控制器进行了比较。结果表明，所提出的控制器在各种情况下都是稳定且鲁棒的，并且是TCP / AQM网络系统的一种合适的设计方法。而且，