Research On Deployment Strategy Of Baseband Function Service Chain Under 5G Optical Transport Network

In the traditional access network architecture,the baseband function is placed by "one size fits",while the baseband processing pool(BBU)is away from the RRU.The result is that a large amount of unprocessed wireless signals flooding into the preamble network and a very large forward transmission pressure,which is difficult to meet the business characteristics of 5G ultra-low latency.Therefore,combining the network resources and service characteristics and other factors,flexibly dividing the baseband function segmentation points is an effective means to solve this problem.Dedicated hardware devices in the traditional networks cannot support flexible functional segmentation due to over-coupling of hardware and software.Universal processors can decouple software and hardware by using virtualization technology and provide network services flexibly.Therefore,baseband functions are deployed in general.Processing platforms have become an important trend in the development of mobile networks in the future.The baseband function is flexibly split,deployed in different general purpose processing pools,and uses service chain technology to direct wireless signals to be processed sequentially between different processing pool nodes.However,service chain deployment needs to consider the joint allocation of multiple heterogeneous resources in the network.The deployment strategy has a great impact on network performance.Therefore,this paper focuses on the optical network resources and computing resources in the 5G optical transport network,and focuses on the deployment strategy of the baseband functional service chain.The main work and innovations of this paper are as follows:Firstly,based on the network architecture that supports flexible partitioning of baseband functions,a mathematical model for optimal deployment of baseband functional service chains is established,and a heuristic algorithm that combines node deployment and link deployment is proposed.Firstly,the network architecture is abstracted into a directed weighted connectivity graph G(V,E),and a virtual baseband functional service chain is constructed for wireless signals,and an integer linear programming model for virtual baseband functional service chain optimization deployment is established;for the baseband functional service chain Deployment,joint consideration of node deployment and link deployment,proposed two heuristic algorithms,namely node priority allocation algorithm and link priority allocation algorithm.The simulation results show that the two algorithms achieve close to ILP optimization with the goal of reducing the network blocking rate.The link priority allocation algorithm is slightly better than the node priority allocation algorithm,and the average service preamble delay under the node priority allocation algorithm is lower than the chain.Road priority algorithm.Secondly,the network management module of the optical and wireless convergence platform was designed and developed.Through the platform experiment verification,this module can realize the flexible configuration and management of the baseband function with the platform,and carry out the experimental verification research of the virtual baseband function service chain deployment on the platform,and display the front end through the virtual network function service chain management platform.