This Recommendation describes the concept of network slicing and use cases of multiple network slicing where a single device is simultaneously connecting to different network slices when the device requests different services. The use case describes the slice service type (SST) for indicating a specific network slice and the slice user group (SUG) for precisely representing the network slice in terms of performance requirements and business models. From the multiple network slicing perspective@ this Recommendation specifies high-level requirements in service aspect as well as network aspect. It also specifies high-level architecture in terms of network slice and network function.