 set of technologies to create specialized, ded- icated logical networks as a service (NaaS) in order to support different network ser- vices and meet the diversified requirements from vertical industries. Through flexible and customized design of functions, isolation mechanisms, and operation and mainte- nance (O&M) tools, network slicing is capable of providing logical dedicated networks upon a common infrastructure. Network slice instance (NSI): an NSI is the realization of a network slice. It is an end-to-end logical network, which comprises of a group of network functions, resources, and con- nection relationships. An NSI typically covers multiple technical domains, which include terminal, RAN, TN and CN as well as DC domain. Different NSIs may have different net- work functions and resources. They may also share some of the network functions and resources such as computing, storage, and transmission. Network slice types: these are high-level categories for NSIs, which reflect the distinct demands for network solutions. Three fundamental network slice types have been iden- tified for 5G: eMBB, mMTC, and URLLC. These could be further extended, e.g. according to the operator's policies or with the development of 5G. Network slice template: this is the output of the slice design phase used to create NSIs. Tenants: these are the operators' customers (for example, customers from vertical indus- tries) or the operators themselves. They utilize the NSIs to provide services to their users. Tenants typically will have independent O&M requirements, which are uniquely appli- cable to the NSIs. The following descriptions of relationship between the aforementioned key concepts help understand them better before proposing deployment scenarios and key technologies: Network slice types and tenants are important references for creating an NSI: an NSI is instantiated from one network slice template with a specific network slice type. A tenant that provides different service types may use multiple NSIs with different network s