一种新型的BoD带宽请求分配算法

New BoD Bandwidth Request Allocation Algorithm

BoD协议中可以通过充分利用按需分配后剩余的带宽来降低时延。首先针对如何高效地利用剩余带宽及其对反馈控制的影响,提出了一种新型的基于预测和星上反馈控制的BoD带宽请求分配算法。其次根据网络流量同时呈现长相关和短相关特性,提出采用ARFIMA(p,d,q)模型进行流量建模与预测,该模型根据参数d的取值不同既能表示长相关又能表示短相关。最后利用OPNET软件建立仿真系统。仿真结果表明,对于长相关和短相关业务流,基于ARFIMA(p,d,q)模型预测和星上反馈控制的BoD带宽请求分配方案能够最高效地利用剩余带宽来降低时延。

In BoD（Bandwidth on Demand） protocol, full utilization of remaining bandwidth after allocation on demand can reduce service delay. First on account of how to make efficient use of remaining bandwidth and its effect on feedback control, this paper proposed a new BoD bandwidth request allocation algorithm based on prediction and on-board con- trol. Secondly in view of both the long and short range dependence of network flow, we proposed ARFIMA（p, d, q） model for traffic modeling and prediction, which can represent both long and short range dependence according to the different values of parameter ck Finally we employed OPNET for simulation system. The simulation results indicate that, for both long and short range dependence service flow, BoD request allocation scheme based on ARFIMA（p, d, q） prediction and on-board feedback control can reduce service delay to the most degree, with the help of remaining band- width.