Research On Multi-path Reliabletransmission Mechanism In Integrated Fiber-Wireless Access Network

The Integrated Fiber-Wireless(FiWi)network consists of a front-end wireless network and a back-end optical fiber network.Therefore it has optical network alarge-capacity,long-distance relaying,low electromagnetic interference and wireless networks low network cost,low maintenance cost and strong flexibility and become one of the important solutions for broadband access technology.However,the state of the wireless network has strong volatility,while the passive optical network tree topology is poor robustness.How to make the best use of the advantages of FiWi networks,overcome network bottlenecks,ensure services transmission reliable,what's more solve unexpected network failures and guarantee the service quality requirements are crucial.Therefore,based on the network virtualization,this thesis studies the multipath technology of FiWi network and puts forward corresponding backup protection strategies for different levels of sudden failure.Firstly,this thesis gives an overview of the basic principles,network architecture and transmission mode of FiWi network.Then introduce the network virtualization,and proposed the FiWi network virtualization model.Useing of network virtualization resources centralized management and shielding the heterogeneity of the network characteristics,the selection of business transmission path migration to virtualization management layer.It also elaborates the basic principles of various survivability protection strategies in FiWi networks.Secondly,a multipath reliable transmission mechanism for FiWi network is proposed.By establishing virtualization layered model,the advantages of centralized management of virtualized network resources and the global perspective of the network are utilized.A multi-path parallel transmission mechanism is adopted and a post-fault recovery scheme is designed to ensure reliable network transmission.The results show that the proposed mechanism is superior to the full backup and shared backup scheme,which ensures network reliability and achieve network load balance,resource utilization at the same time minimize backup resources.Thirdly,a reliable transmission mechanism for FiWi network with differentiated protection is proposed.This mechanism aims at the actual situation where different network users have different requirements for network service quality.Based on the protection quality of users' requirements and the fees that they paid,a backup resource allocation strategy based on the probability of restoration for distinguishing protection is given for its flexible allocation backup protection resources.A genetic algorithm is used to select a protection link that satisfies the service protection requirements,so that the number of rejected services and the number of unprotected services are minimized,and the network overhead is minimized,thereby providing the user with a more flexible virtual network fault recovery solution.Finally,the research content of the thesis is summarized,and the future research of FiWi network and multipath technology is prospected.