基于IP over WDM网络的IP业务时延测算算法（英文）

Time delay calculation algorithm for IP traffics in IP over WDM networks

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。

Time delay of IP traffics contains two factors： the fixed time delay and the variable time delay while the variable one has great influences on networks. Time Delay Calculation （TDC） algorithm focuses on two variable time delay： O/E/O conversion delay and queuing delay for different levels of IP traffics in IP over WDM networks. Overlay model is as the network model and routing algorithm is Dijkstra. The TDC algorithm consists of three processes： traffic generation, traffic scheduling and traffic blocking. Traffic generation is by Fractional Brownian Motion （FBM） of the self- similar model. Traffic scheduling uses Weighted Round- Robin （WRR） algorithm and traffic blocking is according to the node capacity. The effects of standard deviation of traffic weights and traffic numbers on time delay of IP traffics were analyzed though simulation. Numerical simulation results show that TDC algorithm can measure time delay dynamically. And time delay of IP traffics can be reduced by controlling standard deviation of weights.