网络传输系统中负载性能协调控制研究

摘要

网络传输系统是由网络系统和控制系统的有机结合,系统的整体性能不仅仅取决于系统的最优控制算法,而且还取决于整个网络资源的合理调度.网络传输系统中负载性能协调控制就是在控制性能和网络服务质量之间寻求一个折中,设计最优的控制策略和调度算法以确保系统的整体性能达到最优.目前大多数研究是将控制器的设计和调度算法的设计分开,将两者结合起来的研究并不多.提出一种基于RM调度的协调控制方法,上述方法将协调控制问题转换为求取与采样周期有关的性能指标函数极值问题,保证系统的稳定性和网络资源的可调度性.通过TrueTime仿真平台对基于RM调度的协调控制方法进行仿真研究,仿真结果表明,选用方法既能保证网络传输系统的稳定性,又能提高网络资源的利用率.%Network transmission system is a combination of network system and control system,its overall performance depends on not only optimal control algorithm of the system but also the whole reasonable scheduling algorithm of network resources.Network transmission system load coordinated control is to seek a compromise between control performance and network quality of service,design optimal control strategy and scheduling algorithm to ensure optimal performance.Currently,most research separates the design of controller and the design of scheduling algorithm,the study on the combination is insufficient.A coordinated control method based on RM scheduling is proposed,it converts the coordinated control problem into the performance function extreme problem which relates to the sampling period,and ensures stability of the system and network resources schedulability.The simulation of this coordinated control method based on RM scheduling is studied based on TrueTime simulation platform,the simulation results demonstrate that this method can guarantee the stability of the network transmission system,and also improve the utilization of network resources.