Protection switching schemes of multi-granularity p-cycles in survivable WDM networks  

作　　者：祝国龙 曾庆济 叶通 杨俊杰 

机构地区：[1]TheStateKeyLaboratoryonFiber-opticalLocalAreaNetworksandAdvancedOpticalCommunicationSystems,ShanghaiJiaoTongUniversity,Shanghai200030

出　　处：《Chinese Optics Letters》2004年第9期508-511,共4页中国光学快报（英文版）

基　　金：This work was supported by the Natural Science Foundation of China under Grants No. 69990540 and 90304002.

摘　　要：In this paper, a novel concept of multi-granularity p-cycle is proposed. In conventional p-cycle concept, all on-cycle spans have the same capacity. However, in multi-granularity p-cycle, each on-cycle span could have different capacity. Resnlts show that multi-granularity p-cycles are much more capacity-efficient and cost-effective than conventional p-cycles. We also propose two protection switching schemes for all types of p-cycle networks. One is wrapping protection, in which only two end nodes do real-time switching when a span failure happens. The other is steering protection, in which at most four nodes do real-time switching when a span fails. In steering protection switching scheme, the restoration path for the failure traffic demand has the least hops.In this paper, a novel concept of multi-granularity p-cycle is proposed. In conventional p-cycle concept, all on-cycle spans have the same capacity. However, in multi-granularity p-cycle, each on-cycle span could have different capacity. Resnlts show that multi-granularity p-cycles are much more capacity-efficient and cost-effective than conventional p-cycles. We also propose two protection switching schemes for all types of p-cycle networks. One is wrapping protection, in which only two end nodes do real-time switching when a span failure happens. The other is steering protection, in which at most four nodes do real-time switching when a span fails. In steering protection switching scheme, the restoration path for the failure traffic demand has the least hops.

关 键 词：PROTECTION SWITCHING Wavelength division multiplexing 

分 类 号：O431.1[机械工程—光学工程]