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Network Slicing is considered as one of the key feature by 3GPP in 5G. A network slice can be looked as a logical end-to-end network that can be dynamically created. A UE may access to multiple slices over the same gNB. Each slice may serve a particular service type with agreed upon Service-level Agreement (SLA).
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To uniquely identify a Network Slice, the 5G system defines the S-NSSAI (Single – Network Slice Selection Assistance Information).
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S-NSSAI is made up of two field SST (Slice/Service Type) and SD (Service Differentiator). SD is an optional field. SST has 8 bit field length implying that it can indicates a total of 255 different slice types.
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