Design And Simulated Implementation Of Protection Algorithms Based On Failure Dependency In Fiber-Wireless(FiWi)Access Network

With the rapidly development of Network and communication technology and the rise of big data service,people become more and more rely on the network in life and work.The higher demand of bandwidth lead to the amazing growth of the network traffic load.People expect to get all kinds of information they need through the network at any time and anywhere.In order to achieve this purpose,wireless access network and optical fiber access network technology play important roles.Wireless and optical fiber access network can complement each other.Comparing with the wireless access network,optical fiber network is not flexible,but it can provide huge bandwidth.Wireless access network is more flexible,however,it is limited by transmission channel bandwidth.To satisfy the increasing demand of network,The future broadband access network must have the advantages of both optical fiber and wireless technology.Therefore Fiber-wireless(FiWi)access networks was rised.Survivability is one of the key issues for next generation optical access network,since network component failure may interrupt many high-rate traffic connections.As a promising optical access technology,FiWi access network has been widely acknowledged as a cost-efficient solution for the survivable design.This thesis focuses on the Survivability of optical access network problems in Fiber-Wireless(FiWi)Access Network.On the basis of FiWi Access Network and the Survivability of optical access network,Failure Dependency-based Protection Scheme.this thesis designs Backup Resource Configuration based on Failure Dependency algorithms.In BRCFD,this thesis gives A failure probability model is proposed to estimate the failure probability of each single segment and the failure dependency of each segment pair.In the first stage of BRCFD,we consider the optimization of backup capacity allocation among the segments in the network.Our objective is to minimize the number of occupied backup capacity units under the constraints.In the second stage of BRCFD,we consider the optimization of backup fibers deployment among the segments in the network.Under the constraint of backup-optical-path length,we aim to establish the backup-optical-path between each pair of primary and backup segments with the minimum deployment cost of backup fibers.To evaluate the performances of the proposed algorithms,this thesis develops the simulation through the VC++6.0 software.Simulation results demonstrate that our BRCFD scheme can effectively reduce the consumption of backup resource.It is also scalable to higher traffic demand,larger network size and higher risk level.