Research On Network Slicing For Elastic Fiber Wireless Networks

In recent years,5G communication system is developing rapidly,and the number of applications with high bandwidth demand is growing rapidly.Hybrid fiber wireless(Fi-Wi)access technology has been regarded as a potential next generation access network,which is expected to alleviate the increasing pressure of bandwidth and meet the challenges of various ubiquitous business requests.Fi-Wi network technology provides users with the possibility of establishing high-quality connections,while ensuring network flexibility and economy.However,due to the heterogeneity of network structure and resource types between optical and wireless subnets of Fi-Wi network,the overall management and optimization of the heterogeneous network is difficult.Therefore,how to eliminate the difference between wireless network and optical network is of great significance.This paper considers using network slicing technology in heterogeneous networks,which can not only provide differentiated proprietary services,but also hide some basic characteristics of physical networks to achieve global optimal network management in heterogeneous networks.The research will focus on the problem of network slicing for elastic Fi-Wi network,and choose end-to-end hybrid elastic Fi-Wi network as the physical network architecture,which includes hybrid Fi-Wi network as the access network and elastic optical network as the core transmission network.Firstly,the problem of multi-domain routing and heterogeneous network resource allocation in the business scenario of long-distance transmission between heterogeneous multi domains in end-to-end hybrid elastic Fi-Wi network is researched.To solve this problem,this paper uses multi-path routing strategy,and achieves resource sharing and allocation of adjacent access segments under the constraints of wired network resources and wireless network resources.Based on this,a heterogeneous multi-domain and multi-path routing heuristic algorithm with ONU sharing is constructed.The simulation results show that the heuristic algorithm considers the capacity bottleneck of wireless subnet for end-to-end multi-domain network in heterogeneous networks,and effectively reduces the network bandwidth blocking rate.Secondly,the dynamic network slicing problem based on end-to-end hybrid elastic Fi-Wi network is researched.To solve this problem,this paper proposes a hybrid elastic Fi-Wi network dynamic slicing management mechanism,which focuses on the whole life cycle of network slicing.According to the changing traffic state,it can realize the differential slicing embedding and dynamic isolation of virtual resources allocated to each network slice.The mechanism includes network slice virtualization embedding during slice initialization,prediction-based network slice online reconfiguration,intra-slice multipath routing and resource sharing allocation strategy.Therefore,a prediction based dynamic slicing algorithm with intra-slice multipath routing and shared resource allocation is proposed.The simulation results show that the prediction based dynamic slicing is more suitable for dynamic network scenarios and can provide enough bandwidth for more network services.The strategy of multi-path routing and sharing resources of adjacent sub network slices can further improve the utilization of network resources in heterogeneous networks.Therefore,this method is an effective solution for flexible network slicing in elastic Fi-Wi network.