The Optimization Design Of Metropolitan And Access Conyergence In 5G Network

With the emergence of ultra-high-bandwidth,smart cities,industrial automation and other ultra-high-bandwidth,massive data communication services,the next-generation communication network is expected to have the characteristics of large capacity,long distance,flexibility,high efficiency,low power consumption and cost,and intelligent management and control.The fifth-generation communications communication network is the basis for supporting such services.In order to meet the service requirements and have the above network characteristics,the 5G communication network develops in the following directions:the network is flat,andthe lower layer physical devices only have the forwarding function separation through the software-defined network architecture,and the control functions are unified by the upper layer controller.In order to achieve these goals faster and adapt to the network development trend,it is imperative to further study and study key technologies in the 5G communication network.In order to support the establishment of large-capacity,multi-service,high-reliability optical networks and meet the requirements ofhigh-bandwidth,bursty,and highly-flexible services,the communication network must provide higher transmission rates,balanced network load and traffic distribution,and network resources.Rationally allocate and support multiple types of services,and all parts of the device are highly scalable and reconfigurable.This article will analyze and research the various technologies in metropolitan area network and access network according to the development direction and characteristics of 5G communication network.In the access network part,this paper investigates the optical carrier millimeter wave technology and designs a set of reconfigurable ROF distributed antenna systems based on flexible optical devices.The system is based on flexible optical components.It combines the advantages of high fiber bandwidth,transmission stability,and flexible access to wireless communication.The 30GHz and 60GHz carrier frequencies are switchable,and digital signals are transmitted using high-order modulation.Spectrum use range and spectrum efficiency.The simulation results prove the effectiveness and feasibility of the system,and provide some references and ideas for designing a more comprehensive and better performance dynamic reconfigurable ROF system in the future.The metropolitan area network mainly studied and discussed the performance evaluation of optical fiber channels,signal damage compensation,service support,and network resource allocation in coherent optical communication systems.Aiming at the influence of dispersion and non-linear effects on the signal in the fiber channel,an evaluation model of the performance of the fiber channel affected by various physical impairments is summarized and improved.In addition,in the coherentoptical communication system,the frequency offset and phase rotation caused by thelaser oscillation,the quadrature branch of the same direction and other factors are analyzed,and the sigrial distortion caused by the system is recovered by the digitalsignal processing algorithm..On the other hand,it introduces the software-defined network technology in the metropolitan area network.Through the abstraction of the network topology and resources,the control and forwarding operations are separated and the network is programmable and easy to deploy.The introduction of SDN technology into a communication network can effectively monitor and manage the entire network.Itcentralizes the use of network resources and device information in the resource database of the SDN controller,and can flexibly handle new services under different network conditions..In the fourth chapter,we design a routing and resource allocation algorithm in data center optical network aiming at achieving traffic engineering and load balancing under the integrated management and control of SDN controller.This section combines knowledge of fiber channel transmission performance,high-level modulation techniques in high-speed optical communication systems,and routing and spectrum allocation algorithms.Through software programming simulation,it is verified that the whole algorithm can achieve the purpose of reducing the network blocking rate and improving the utilization efficiency of spectrum resources and computing resources.