Method and device for providing network slice

A server configured as a three-hierarchy structure including a service requirement management unit (SRMU), a network slice management function (NSMF), and at least one network slice subnet management function (NSSMF), providing a network slice, the server comprising:

• communication circuitry;
• and
• control circuitry configured to:
• receive, using the SRMU, information related to service requirements;
• identify, using the SRMU, based on the received service requirements, slice requirements including information related to quality of service (QoS), mobility level, and security;
• identify, using the NSMF, based on the slice requirements, whether a network slice template (NST) for the network slice matches one of predefined NSTs;
• based on identifying that the NST is distinct from the predefined NSTs, generate, using the NSMF, an NST including information related to a list of the slice requirements and a list of at least one management function for the network slice;
• identify, using the NSMF, the generated NST as the NST for the network slice;
• generate, using the NSMF, based on the NST and the slice requirements, at least one network slice subnet template (NSST) including information related to a list of slice subnet requirements and the information related to the list of at least one management function for the network slice;
• generate, using the at least one NSSMF, at least one network slice subnet instance (NSSI) corresponding to the at least one NSST;
• and
• allocate, using the NSMF, based on the at least one NSSI, a network slice instance (NSI) for generating the network slice according to the slice requirements, wherein the NSI includes information related to an instantiation state associated with the NSI.