In this paper,the sharing schemes of multicast in survivable Wavelength-Division Multi-plexed(WDM) networks are studied and the concept of Shared Risk Link Group(SRLG) is considered.While the network resources are sha...In this paper,the sharing schemes of multicast in survivable Wavelength-Division Multi-plexed(WDM) networks are studied and the concept of Shared Risk Link Group(SRLG) is considered.While the network resources are shared by the backup paths,the sharing way is possible to make the backup paths selfish.This selfishness leads the redundant hops of the backup route and a large number of primary lightpaths to share one backup link.The sharing schemes,especially,the self-sharing and cross-sharing,are investigated to avoid the selfishness when computing the backup light-tree.In order to decrease the selfishness of the backup paths,it is important to make the sharing links fair to be used.There is a trade-off between the self-sharing and cross-sharing,which is adjusted through simulation to adapt the sharing degree of each sharing scheme and save the network resources.展开更多
In this paper, a Wavelength Division Multiplexing (WDM) network model based on the equivalent networks is described, and wavelength-dependent equivalent arc, equivalent networks, equivalent multicast tree and some oth...In this paper, a Wavelength Division Multiplexing (WDM) network model based on the equivalent networks is described, and wavelength-dependent equivalent arc, equivalent networks, equivalent multicast tree and some other terms are presented. Based on this model and relevant Routing and Wavelength Assign- ment (RWA) strategy, a unicast RWA algorithm and a multicast RWA algorithm are presented. The wave- length-dependent equivalent arc expresses the schedule of local RWA and the equivalent network expresses the whole topology of WDM optical networks, so the two algorithms are of the flexibility in RWA and the optimi- zation of the whole problem. The theoretic analysis and simulation results show the two algorithms are of the stronger capability and the lower complexity than the other existing algorithms for RWA problem, and the complexity of the two algorithms are only related to the scale of the equivalent networks. Finally, we prove the two algorithms’ feasibility and the one-by-one corresponding relation between the equivalent multicast tree and original multicast tree, and point out the superiorities and drawbacks of the two algorithms respectively.展开更多
OTN，也称为OTII（Optical Transport Hierarchy），结合了光域和电域处理的优势，能提供巨人的传送容量、完全透明的端到端波长／子波长连接以及电信级的保护，是传送宽带大颗粒业务最优的技术。从居于核心地位的G．709协议中可以看出...OTN，也称为OTII（Optical Transport Hierarchy），结合了光域和电域处理的优势，能提供巨人的传送容量、完全透明的端到端波长／子波长连接以及电信级的保护，是传送宽带大颗粒业务最优的技术。从居于核心地位的G．709协议中可以看出，OTN跨越了传统的电域（数字传送）和光域（模拟传送），成为管理电域和光域的统一标准。OTN处理的基本对象是波长级业务，将传送网推进到真正的多波长光网络阶段。展开更多
Y2001-62866-398 0121186多波长光网络节点串话的性能分析=Performanceanalvsis of crosstalk of multi-wavelength optical networknodes[会,英]/Fang,L.-F.& Lin,M.-F.//2000 In-ternational Conference on Communication Technol...Y2001-62866-398 0121186多波长光网络节点串话的性能分析=Performanceanalvsis of crosstalk of multi-wavelength optical networknodes[会,英]/Fang,L.-F.& Lin,M.-F.//2000 In-ternational Conference on Communication TechnologyProceedings Vol.Ⅰ of Ⅱ.—398～401(HC)展开更多
Y98-61409-63 9913683WDM 系统中与波长数有关的物理和网络问题=Physical and network aspects concerning the number ofwavelengths in WDM systems[会,英]/Rapp,L.&Japer,H.A.//1998 Proceedings of the InternationalZurich Sem...Y98-61409-63 9913683WDM 系统中与波长数有关的物理和网络问题=Physical and network aspects concerning the number ofwavelengths in WDM systems[会,英]/Rapp,L.&Japer,H.A.//1998 Proceedings of the InternationalZurich Seminar on Broadband Communications.—63～68(MaG)展开更多
基金the National Natural Science Foundation of China (No.60502004)
文摘In this paper,the sharing schemes of multicast in survivable Wavelength-Division Multi-plexed(WDM) networks are studied and the concept of Shared Risk Link Group(SRLG) is considered.While the network resources are shared by the backup paths,the sharing way is possible to make the backup paths selfish.This selfishness leads the redundant hops of the backup route and a large number of primary lightpaths to share one backup link.The sharing schemes,especially,the self-sharing and cross-sharing,are investigated to avoid the selfishness when computing the backup light-tree.In order to decrease the selfishness of the backup paths,it is important to make the sharing links fair to be used.There is a trade-off between the self-sharing and cross-sharing,which is adjusted through simulation to adapt the sharing degree of each sharing scheme and save the network resources.
基金Supported by the Natrual Science Foundation of Shaanxi (No.2004A02) and Outstanding Scholar Project of P. R. China (2002).
文摘In this paper, a Wavelength Division Multiplexing (WDM) network model based on the equivalent networks is described, and wavelength-dependent equivalent arc, equivalent networks, equivalent multicast tree and some other terms are presented. Based on this model and relevant Routing and Wavelength Assign- ment (RWA) strategy, a unicast RWA algorithm and a multicast RWA algorithm are presented. The wave- length-dependent equivalent arc expresses the schedule of local RWA and the equivalent network expresses the whole topology of WDM optical networks, so the two algorithms are of the flexibility in RWA and the optimi- zation of the whole problem. The theoretic analysis and simulation results show the two algorithms are of the stronger capability and the lower complexity than the other existing algorithms for RWA problem, and the complexity of the two algorithms are only related to the scale of the equivalent networks. Finally, we prove the two algorithms’ feasibility and the one-by-one corresponding relation between the equivalent multicast tree and original multicast tree, and point out the superiorities and drawbacks of the two algorithms respectively.
文摘OTN，也称为OTII（Optical Transport Hierarchy），结合了光域和电域处理的优势，能提供巨人的传送容量、完全透明的端到端波长／子波长连接以及电信级的保护，是传送宽带大颗粒业务最优的技术。从居于核心地位的G．709协议中可以看出，OTN跨越了传统的电域（数字传送）和光域（模拟传送），成为管理电域和光域的统一标准。OTN处理的基本对象是波长级业务，将传送网推进到真正的多波长光网络阶段。
文摘Y2001-62866-398 0121186多波长光网络节点串话的性能分析=Performanceanalvsis of crosstalk of multi-wavelength optical networknodes[会,英]/Fang,L.-F.& Lin,M.-F.//2000 In-ternational Conference on Communication TechnologyProceedings Vol.Ⅰ of Ⅱ.—398～401(HC)
文摘Y98-61409-63 9913683WDM 系统中与波长数有关的物理和网络问题=Physical and network aspects concerning the number ofwavelengths in WDM systems[会,英]/Rapp,L.&Japer,H.A.//1998 Proceedings of the InternationalZurich Seminar on Broadband Communications.—63～68(MaG)
