什么是网络切片？
3GPP TS38.300）： Network Slicing is a concept to allow differentiated treatment
depending on each customer requirements. With slicing, it is possible for Mobile
Network Operators (MNO) to consider customers as belonging to different tenant
types with each having different service requirements that govern in terms of what
slice types each tenant is eligible to use based on Service Level Agreement (SLA)
and subscriptions.
1. 网络切片可由运营商使用，基于同客户签订的Service level Agreement SLA业务服务
协议，为不同垂直行业、不同客户、不同业务，提供相互隔离、功能可定制的网络服务，
是一个提供特定网络能力和特性的逻辑网络
2. 逻辑的网络切片由网络切片实例承载，网络切片实例是一个部署的网络切片，包括一些
网络功能实例及所需的资源（例如计算、存储及网络）
3. 相同跟踪区（Tracking Area，TA）支持相同的网络切片
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