计算机通信网络中一种基于速率的PDFF拥塞控制方案

On PDFF Rate-based Congestion Control Scheme in High-Speed Computer Communication Networks

从最优策略的角度出发,将控制理论中的控制方法引入主动队列管理的研究中,提出了一种基于控制理论的主动队列管理PDFF拥塞控制方案。该方案以快速延迟响应和缓冲队列稳定为优化目标,根据网络动态时延调节源发送端发送速率,使得队列长度能够很快收敛到目标值,并且抖动很小。通过不同网络环境下的仿真显示,与PI控制方案相比,该PDFF控制方案具有较低的链路延迟和数据丢失率,并能更快地使整个网络系统达到稳定,具有较好的网络性能。

From the viewpoint of strategy theory, AQM （ Active Queue Management） can be considered as an optimal strategy problem. In this paper, a new AQM scheme, Proportional Derivative Feedback Feedforward （PDFF） , is described based on the optimal strategy theory of PDFF. Aiming to response the delay quickly and stabilize the queue length, PDFF adjusts the sender rate adaptively according to the instantaneous delay. Simulation demonstrates that PDFF can lead to the convergence of the queue length to the desired value quickly and maintain the oscillation small. The results also show that the performance excellence of the PDFF scheme in terms of the lower link delay, the lower loss rate and fast system response.