Research on 5g network resource orchestration algorithm based on network virtualization technology

With the advancement of wireless network technology to the next generation, network function virtualization (NFV) brings the advantages of centralized scheduling of virtual wireless resources and the ability to orchestrate virtual network functions. This makes it possible to dynamically deploy and manage service function chains (SFCs) in virtualized wireless networks according to changes in network load. Through the network function virtualization technology, the DU/CU separation architecture under 5G-NG-RAN is considered. Aiming at the resource orchestration problem of the 5G access network virtual protocol stack function and service function chain after deployment, an energy-aware virtualized network function instance (VNFI) orchestration algorithm is proposed. By modeling the underlying physical network and node energy consumption, the node load, resource type, tolerable delay and migration loss are included in the decision, and the state of the general server node is divided into two types: running state and sleep state. The algorithm decouples the decision-making process of VNF migration into two specific modules, namely "the VNF selection module" and "the migration destination node selection module". It is verified by simulation that compared with other energy-saving strategies, the algorithm in this paper has better performance in reducing energy consumption and reducing migration loss, and it can take into account both the reduction of the number of open server nodes and the improvement of resource utilization.