【摘要】 本文比较研究了分层结构自动交换光网络 (ASON)中四种路由计算和连接管理策略 :基于链路状态的分层路由和前向资源预留 (LS HRFR)、基于链路状态的源路由和前向资源预留 (LS SRFR)、基于本地信息的分层路由和沿路径探测、后向资源预留 (P HRBR)以及基于本地信息的源路由和沿路径探测、后向资源预留 (P SRBR) .离散事件仿真的结果表明 :采用基于本地信息进行路由计算并通过沿路径探测资源使用信息来选取空闲波长的策略 (P HRBR和P SRBR)相对基于链路状态的路由计算和空闲波长选取策略 (LS HRFR和LS SRFR)来说 ,在分层路由情况下 ,其对网络总阻塞率的改善微乎其微 ,但在源路由的情况下 ,其对网络总阻塞率的改善十分明显 .更多还原

【Abstract】 Four kinds of routing and connection management schemes in hierarchical ASON are proposed in this paper.These schemes are Link State based Hierarchical Routing and Forward resource Reservation (LS-HRFR),Link State based Source Routing and Forward resource Reservation (LS-SRFR),local information and Probing based Hierarchical Routing and Backward resource Reservation (P-HRBR),local information and Probing based Source Routing and Backward resource Reservation (P-SRBR) respectively.The performances of these schemes in hierarchical networks are compared through discrete event simulation.The results indicate that,compared with link state based schemes,probing based schemes can improve the connection acceptance capacity of a network greatly in source routing scenarios while they hardly improve that capacity in hierarchical routing scenarios.更多还原