无线多媒体网络的QoS传输控制模型仿真

Simulation of QoS transmission control model in Wireless Multimedia Networks

针对无线网络多媒体传输过程中存在速度较慢、稳定性较差,导致人机交互实时性降低、数据丢失的问题,提出面向无线网络多媒体传输的QoS控制模型方法,利用Lyapunov漂移把时间均值优化转变成最小化形式,分解相应的无线资源及多媒体层数。结合控制回路、常规反馈控制器、被控对象及参考模型构成QoS控制模型,将传输控制问题映射至自适应的QoS模型中。采用控制器实时调整输出及输入参数对资源进行动态分配,实现QoS控制。仿真结果表明,采用所提控制模型可有效控制网络吞吐量分布情况,丢包率降低,传输速率加快。

In the process of multimedia transmission in wireless networks, slow speed and poor stability result in low real-time human-computer interaction and poor data integrity. In this regard, a QoS control model method for wireless network multimedia transmission is proposed. Lyapunov drift was applied to minimize the time mean, and then the corresponding wireless resources and multimedia layers were decomposed. The control loop, conventional feedback controller, controlled object and reference model were integrated to establish the QoS control model. The transmission control problem was mapped to an adaptive QoS model. The controller was applied to adjust the output and input parameters in real-time. Eventually, QoS control was completed for resource allocation. The simulation results show that the model has a low packet loss rate and fast transmission rate, showing that it can effectively control the distribution of network throughput.