Network Slicing is one of the key features introduced by 3GPP for 5G (NR) and can also be seen as a dynamically created logical end-to-end network. Multiple slices can be used by a terminal (UE) over the same gNB, and each slice provides services for a specific service type based on an agreed service level agreement (SLA). While Network Slicing in 5G system is just a logical network can fulfill user (UE) specific service requirements such as low latency, high bandwidth or other service related parameters. And NSSAI uses are as follows;
I. NSSAI is Network Slice Selection Assistance Information (NSSAI) in 5G (NR) systems, which is a key factor in the definition of specific network slice functions and characteristics.
II.NSSAI Functions It allows distinguishing and selecting network slices based on a variety of factors, which contain information about the slice's functionality, and services to fulfill specific requirements. This information is essential for the 5G core network to make informed decisions when selecting the appropriate network slice for a given user or application.
III. The NSSAI structure includes key elements about slices, such as SD-slice distinguisher (which helps to uniquely identify a specific slice) and SST-service type (which specifies the type of service provided by a slice); in addition the NSSAI contains information about the coverage area to ensure that the network slices are applicable within the defined geographic area.
In short ,NSSAI in 5G(NR) plays a key role in enabling the effective selection and management of network slices, ensuring that each slice meets specific service requirements, ultimately contributing to a more versatile and dynamic 5G network architecture.
