Research On Network Reliability Transimission And Resource Efficiency Improvement In FlexE-over-WDM Network

Ultra-reliable and low-latency communications(URLLC)is one of the three application scenarios of the fifth generation(5G)of mobile communication.In recent years,stricter requirements are put forward for the latency and reliability of 5G bearer network.Flexible Ethernet(FlexE)over wavelength division multiplexing(WDM)is considered as a promising approach by means of bundling or dividing physical Ethernet interfaces into multiple hard slices over WDM to support deterministic 5G transport.In order to achieve high reliability,IEEE.802.1CB is one of the TSN(Time-Sensitive Networking)active projects which provides seamless redundancy character for Ethernet network by frame replication and elimination for reliability(FRER),which achieves ultra-reliability at the expense of consuming more network resources.This thesis studies the network reliability transimission and resource efficiency improvement in FlexE-over-WDM network,and research work and innovations on the redundant routing and wavelength allocation are as follows:(1)Aiming at the problem of redundant routing based on frame replication and elimination for reliability,we propose a reliability evaluation model to measure the reliability of client flows,and a redundant routing scheme based on segment frame replication and elimination which is to solve the trade-off between reliable transmission and resource utilization efficiency.The scheme is designed to provide segment protection for client flows,ensuring ultra-high reliability while reducing transmission redundancy.Simulation results show that the scheme can maximize the reliability while reducing the network resources and equipment cost.(2)Aiming at the resource allocation based on segment frame replication and elimination strategy,we propose a FlexE Group redistribution strategy based on segment frame replication and elimination.The scheme comprehensively considers the limitations of the related structure of FlexE-over-WDM and the characteristics of segment frame replication and elimination,and reorganizes the FlexE Group that distributes client flows.Simulation results show that,compared with the FlexE Group allocation algorithm,which is a simple sequential flow allocation algorithm,this scheme further optimizes the utilization of network resources and reduces the waste of port resources and wavelength resources.