基于分形散粒噪声的天基网络流量生成

Fractal-Shot-Noise-Based Generation of the Background Traffic in Constellation Networks

为在天基网络中进行应用级开发与研究,需要对背景业务流量进行建模并实时生成。本文提出了一种基于分形散粒噪声的卫星网络聚合背景流量生成算法,该算法根据星间链路的差错特性、星上路由器随机丢弃策略、星间路由往返时延抖动特性、拥塞控制策略,对单个流的速率波动进行建模,进而使用分形散粒噪声过程对天基组网中的聚合业务流量进行模拟生成。本文在空间综合信息网络仿真环境中使用该算法对SCPS-VJ空间传输控制协议聚合流量进行了模拟生成。仿真结果表明,该算法能够生成符合空间网络特性的背景流量。

It is essential to model and generate dthe background traffic in constellation network emulation. A framework of generating fractal-shot-noise-based aggregated flow-level traffic for constellation networks is described in this article. In the model, the shot is shaped by the flow rate, and the flow rate fluctuation is characterized by the BER of inter-satellite links, the buffer management strategy of the onboard router,and the congestion control algorithm of the transport control protocol, then the packet flow is generated using the fractal shot noise process. We implement the traffic generation module in the constellation network emulation environment to generate the SCPS-VJ protocol flow. The results indicate that in contrast to the well-used statistics-based models, the fractal-shot-noise-based traffic generation model can generate self-similar traffic according to the network dynamics.