The invention relates to a service function chaining dynamic deployment method based on QoS (
Quality of Service) guarantee and belongs to the technical field of mobile communication. According to themethod, on the basis of 5
G network slicing, resources are flexibly configured through utilization of a
software defined network and a network function
virtualization technology. In order to improve the QoS of communication business in slice networks, a reliability requirement oriented service function chaining deployment model is established. According to the model, a service function chaining dynamic deployment scheme based on the QoS guarantee is designed with the purpose of minimizing the end-to-end
delay. According to the scheme, node positions and reliability are taken into comprehensiveconsideration;
virtual network functions are deployed through utilization of a novel node arrangement method, and the load of the networks is balanced. In a chaining mapping process, the QoS is improved through selection of the
delay shortest path which satisfies a reliability requirement. According to the method, the end-to-end
delay of the service function chaining is reduced, the deployment reliability is ensured, and a request
acceptance rate and a
resource utilization rate are improved.