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IP业务时延包括两个因素:固定时延和可变时延而可变时延对网络影响更大。时延测算算法(TDC)关注于两类可变时延:在IP over WDM网络中不同等级IP业务的O/E/O交换时延和排队时延。重叠模型被作为网络模型,路由算法为最短路径算法。时延测算算法包括三个过程:业务生成,业务调度和业务丢弃。业务生成由自相似模型中的布朗分形运动(FBM)产生。业务调度选用加权轮询调度算法(WRR)而业务丢弃则是根据节点的容量而定。通过仿真分析了业务权重的标准差和业务数量对IP业务时延的影响。大量的仿真结果表明时延测算算法可以动态地测算时延而且可以通过控制权重的标准差来降低IP业务的时延。
IP service delay includes two factors: fixed delay and variable delay, and variable delay has a greater impact on the network. TDC focuses on two types of variable delay: O / E / O switching latency and queuing delay for different levels of IP traffic in an IP over WDM network. Overlapped model is used as the network model and routing algorithm is the shortest path algorithm. Delay calculation algorithm includes three processes: business generation, business scheduling and business discards. Business generation is generated by Brownian Fractal Motion (FBM) in self-similar models. Business scheduling using weighted round robin scheduling algorithm (WRR) and business discarding is based on the capacity of the node. Through the simulation analysis, the standard deviation of the business weight and the impact of the number of business on the IP service latency. A large number of simulation results show that the delay estimation algorithm can dynamically measure the delay and can reduce the IP service delay by controlling the standard deviation of weights.