5G核心网关键技术，你知道哪些？

5G核心网关键技术，在3GPP规范 23.501中有描述，摘录如下：

The 5G System architecture is defined to support data connectivity and services enabling deployments to use techniques such as e.g. Network Function Virtualization and Software Defined Networking. The 5G System architecture shall leverage service-based interactions between Control Plane (CP) Network Functions where identified. Some key principles and concept are to:

- Separate the User Plane (UP) functions from the Control Plane (CP) functions, allowing independent scalability, evolution and flexible deployments e.g. centralized location or distributed (remote) location.

- Modularize the function design, e.g. to enable flexible and efficient network slicing.

- Wherever applicable, define procedures (i.e. the set of interactions between network functions) as services, so that their re-use is possible.

- Enable each Network Function to interact with other NF directly if required. The architecture does not preclude the use of an intermediate function to help route Control Plane messages (e.g. like a DRA).

- Minimize dependencies between the Access Network (AN) and the Core Network (CN). The architecture is defined with a converged core network with a common AN - CN interface which integrates different Access Types e.g. 3GPP access and non-3GPP access.

- Support a unified authentication framework.

- Support "stateless" NFs, where the "compute" resource is decoupled from the "storage" resource.

- Support capability exposure.

- Support concurrent access to local and centralized services. To support low latency services and access to local data networks, UP functions can be deployed close to the Access Network.

- Support roaming with both Home routed traffic as well as Local breakout traffic in the visited PLMN.

总结来看：

1  核心网虚拟化以及SDN 软件定义网络

2  控制面和用户面分离，计算与存储分离

3 服务化架构支持网络切片

4  支持多种网络接入

5   开放性

至于如何应用到行业中，可以说任何垂直行业的应用都离不开核心网的参与，当前切片应用正在探索中，虚拟化带来的收益还未体现。

总之，那帮专家们画了一个大饼，但是大饼究竟是否有更多的营养，那就呵呵了。