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).
To uniquely identify a Network Slice, the 5G system defines the S-NSSAI (Single – Network Slice Selection Assistance Information).
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.
- SST (Slice/Service Type) – this will define the expected behaviour of the Network Slice in terms of specific features and services, such as V2X. The standard SST values are highlighted below :
| Slice/Service Type | SST Value | Characteristics |
| eMBB | 1 | Slice suitable for the handling of 5G enhanced Mobile Broadband |
| URLLC | 2 | Slice suitable for the handling of ultra- reliable and low latency communications |
| MIoT | 3 | Slice suitable for the handling of massive IoT |
| V2X | 4 | Slice suitable for the handling of V2X services |
| HMTC | 5 | Slice suitable for the handling of High-Performance Machine-Type Communications |
2) SD (Slice Differentiator) – this is optional information that complements the Slice/Service type and is used as an additional differentiator if multiple Network Slices carry the same SST value
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