Research On Functional Split Technology For Virtualized Radio Access Network

With the application of 5G and the rise of various Internet services,Internet traffic and data have entered a period of rapid growth.By intensively deploying base stations,operators can solve problems such as data congestion and communication interruption caused by huge data traffic.However,under the traditional distributed radio access network architecture,it brings huge cost to operators.At the same time,the intensive deployment of base stations aggravates the problem of frequent handover of high-speed mobile users,which affects the user service experience.If the baseband processing functions are fully centralized in the centralized radio access network architecture,resource utilization can be improved and interference can be reduced.However,this static deployment mode cannot flexibly allocate resources to meet the different requirements of carriers and users.This makes the new generation of mobile communication network need to have higher performance,so as to better meet the future user service demand,while reducing the cost of operators,to achieve sustainable development.With the rise of virtualization-related technologies such as big data,cloud computing,edge computing,and computing networks,the industry has seen the advantages of virtualization technology in improving the efficiency of infrastructure maintenance and expansion flexibility,and has introduced it into radio access networks.Therefore,as the latest paradigm,the biggest feature of virtual radio access network is that it can carry out dynamic and flexible functional split of base station functions according to different business requirements,so as to improve the system capability of mobile communication network and reduce the cost of operators and the impact of user handover.In this paper,under the framework of virtual radio access network,flexible functional split technology for cost efficiency and network performance improvement is proposed.The main research work is as follows:1.In this paper,a cost-saving functional split technology is designed and studied to solve the problem of huge operating costs caused by the intensive deployment of base stations and considering the dynamic change characteristics of business traffic.In this paper,a heuristic algorithm for flexible sleeping and split is designed to minimize the total cost of operators.The main idea of this algorithm is to select the appropriate working mode and functional split scheme for each base station,and select the set of paths used for it,so as to minimize the total cost.The simulation results show that the cost-saving function split technology proposed in this paper can effectively reduce the total cost of operators in a relatively low time.2.In this paper,a flexible base station reconfiguration technology based on trajectory sensing is designed and studied to solve the problem that frequent handover of base stations during high-speed movement has a strong impact on service performance.This paper proposes a flexible mapping base station reconstruction model,so as to effectively reduces the frequent handover problem caused by moving in different base station coverage areas.Then,this paper considers the further use of flexible functional split technology to reduce the impact on user service quality in the event of an unavoidable handover.This paper combine and standardize the above two objectives to verify the effectiveness of the proposed technique in reducing the handover frequency and handover impact.To sum up,under the framework of virtualized radio access network,this paper focuses on the total cost optimization for operators and the optimization of user-oriented handover and network performance,which provides a new idea for the design and deployment of a new generation of mobile communication networks.