Aside from leading to AO space constraints, the transformation also incurs a high cost, takes a long period, and needs considerable manpower. Pushing edge computing to the access layer and enabling NFV-based access network require the access office (AO) to be transformed by introducing computing and storage resources and installing additional equipment. With NFVI, operators can implement virtual network functions (VNFs) on the access network and alleviate the pressure on the edge data centers. In addition, network function virtualization infrastructure (NFVI) can be introduced to the access network to support edge network clouds and edge service clouds. The content distribution and computing functions can be deployed in the access network to enable experience-sensitive services, relieve pressure on upper-layer networks and cut transmission costs. Big video is a typical experience-sensitive service that has high requirements for latency, packet loss and jitter. In the 5G era, the explosion of data traffic calls for more network bandwidth and resources while also turning big video into a basic broadband network service. The emergence of new services and technologies including big video, 5G, and SDN/NFV poses unprecedented requirements and challenges to access networks.