FDL结构竞争解决的研究

Contention Resolution Scheme Based on FDL Structure

使用光纤延时线(FDL)来解决光分组交换中的竞争问题,研究系统丢包率、时延与输入端口数、输出端口数、FDL数之间的关系,并比较输入端口优先、FDL优先、输入端口和FDL优先级的三种光分组调度策略。结果表明:适当减少端口数,增大FDL数目可以使丢包率趋近于零;而适当增大端口数,减小FDL数目又可以使时延减小。因此,在使用FDL解决竞争冲突时,端口数和FDL数目的选择很重要,它们之间的关系大小直接影响到丢包率和时延的大小。

Fiber delay line（FDL） was utilized to deal with the competition problem in optical packet switching,from which Studying the relationship of the packet lose-rate and delay-time with the number of input ports,output ports and FDLs was studied.Three kinds of optical packet switching methods are presented as： initiative for input port,initiative for FDL,and initiative for both input ports and FDL.Comparative results indicate： appropriate reducing the port number and increasing FDL number can make the packet lose-rate tend near zero,while appropriate increasing port number and reducing the FDL number can make shorter time-delay,For solving competition conflict,the number choice of ports and FDL is very important,because the relationship of them directly affect the packet lose rate and time delay.