一种支持节点分割的vEPC虚拟网络功能部署模型

软件定义网络(SDN)和网络功能虚拟化(NFV)促进了网络的创新，NFV实现了虚拟网络功能(VNF)的逻辑集中部署。针对vEPC(virtualized Evolved Packed Core)网络中VNF的池组化部署问题，该文提出一种支持节点分割的VNF部署模型，该模型基于虚拟请求业务流量的感知，利用节点分割算法动态调整VNF与底层网络资源切片的映射关系，实现VNF的跨域组池。与传统的多功能链联合映射算法相比，该方法能够实现节点资源细粒度化管理和统筹调度，优化网络视图，减少资源碎片。在SNDlib提供的网络拓扑实例下仿真证明，该模型可以降低虚拟网络的资源开销，并提高虚拟网络的请求接收率。

A Model for Virtualized Network Function Deployment Based on Node-splitting in vEPC

Software Defined Networking (SDN) and Network Function Virtualization (NFV) promote network innovation. NFV realizes logic centralized deployment of Virtualized Network Function (VNF). This paper proposes a kind of node-splitting VNF deployment model for problem of pooling deployment of VNF in virtualized Evolved Packet Core (vEPC) network. Based on the acknowledgement of virtual request traffic-aware, the model uses node-splitting algorithm to realize the dynamic adjustment of the mapping relation between VNF and physical network slices and organize the same VNFs across different domains as one pool. Compared with the traditional joint mapping algorithm of multi-function chain, the method can realize fine-grained management and overall scheduling of node resources, optimize network view, and reduce resource fragments. It is proven by network topology instance provided by SNDlib that the model can reduce resource overhead of virtual network and improve the ratio of acceptance of virtual network requests.