Research On Virtual Network Function Orchestration Algorithm For 5G

With the rapid development of wireless networks,the network gradually presents the features of diverse application scenarios,dynamic services,and rapid growth of service requirements,however,traditional wireless access networks cannot meet the future's network performance requirements in terms of architecture and functionality.To introduce the Network Function Virtualization technology into the next-generation wireless network architecture enables flexibly on-demand orchestration of network services and reduces the network operator's CAPEX and OPEX.It is one of the most important technologies for the evolution of wireless networks to 5G.This paper focuses on the research of the virtual network function arrangement under the 5G wireless virtual network.The main research contents and innovation work of this paper are summarized as follows:1.Algorithm for deploying service function chain based on utility maximization in 5G-C-RAN scenario.Aiming at the problem of deploy Service Function Chains in 5G wireless virtual networks,a Service Function Chain's deployment strategy based on maximizing utility is proposed.This strategy meet the differentiated demand of network performance brought by diversified services,and improves the joint revenues of Infrastructure Providers and Wireless Virtual Netwofk Operators.First,the strategy considers the architectural features of 5G-C-RAN and jointly considers the virtual operator's maximum tolerance for end-to-end delay,minimum service rate requirements,and infrastructure operator's computing resources and link resource limitations,while considering the impact of different Service Function Chain deployment scenarios on network performance,using a commercial model,create a utility model for Maximize the joint revenue of infrastructure Providers and virtual operators.Simulation results show that this scheme can improving the jointly total utility of the infrastructure provider and virtual operators.2.Energy-Consumption-Minimization based Virtualised Network Function migration algorithm.Aiming at the problem of Virtualized Network Function(VNF)migration under the dynamic change of service demand in 5G wireless virtual networks,a Virtual Network Function migration strategy based on energy-consumption-minimization was proposed.This strategy firstly evaluates the load status of each General Purpose Processor according to the computing resource utilization after the traffic requirement changes.Then,the migration trigger mechanism based on the load threshold is used to make the VNF migration scheme with the goal of minimizing system energy consumption.At the same time,the algorithm considers the selection of the VNF which is to be migrated and the selection of the migration target node,and considers minimizing the VNF migration loss and guarantees the SLA of the Service Function Chain whitch the VNF is belonged.The final simulation results show that the algorithm can effectively reduce the energy consumption of infrastructure,improve the General Purpose Processor's resource utilization and reduce the VNF migration loss.