针对WWW业务的光缓存优化设计

研究了异步光分组网中的输出光缓存问题，与以往不同的是在处理光分组到达时间间隔时采用Weibull分布，以便更有效地描述互联网中的WWW业务流量类型．通过建立基于Weibull分布的排队模型，得到了排队模型中的丢包率的解析式，并根据数值解得出了光缓存系统的丢包率、系统实际利用率、服务窗口利用率以及平均排队时间随光纤延时线单位缓存时间变化的关系曲线．研究结果表明：在不同的业务强度和缓存深度下选取恰当的单位缓存时间，可以优化光缓存系统的性能．

Optimal Design of Optical Buffer for WWW Service

The system performance of optical buffing is investigated based on fiber delay lines in asynchronous optical packet-switched networks. The queuing model here is different from other papers in that the interval of optical packet arrival is defined by Weibull distribution, which has been demonstrated to be a suitable traffic model for WWW service. Through numerical analysis, conclusions show that the system performance of optical buffering, such as packet loss possibility, the average waiting time, can be optimized by the proper design of the delay unit and the buffering depth for given traffic load.