光突发交换网络中控制分组调度策略的研究

Study on Control Packet Scheduling Strategy in Optical Burst Switched Networks

摘要:

为了支持区分服务(Diffserv)，提出了基于优先级的权重公平队列(PWFQ)调度策略。并提出了一种近似分析模型来简化对不同级别的调度权重的求解。同时定义了一种参数来评价分析模型的有效性和调度策略的公平性。仿真结果证实．我们的分析模型在负载较高时是有效的，而且调度策略能提供很好的公平性。

Abstract:

A new type of control packet scheduling strategy,priority-based weight fair queuing(PWFQ),was propsed to provide differentiated services (Diffserv) for optical burst switched(OBS) networks.An equivalent analysis model was also presented to simplify the solving process of scheduling weight of each priority.We define a parameter,normalized deviatioin factor,to evaluate the validity of our analysis model as well as the fairness of scheduling strategy on supporting diffserv.Numerical results confirm that,it is feasible to analyze queue system,in which PWFQ scheduling strategy is adopted,with our equivalent model when the arrival rate is high.At the same time,it confirms that our scheduling strategy performs well on providing fair diffserv in terms of packet loss probability.