# On the Rollout of Network Slicing in Carrier Networks: A Technology Radar
## 5 CN Domain
### Functionality
Having a slice-specific PCF allows the customer to inject tailored QoS policies over in-slice traffic flows. * **5 GC slice Type B3 (premium CP)**: represents a 5 GC slice Type B2 provisioned with dedicated AMF. Having a slice-specific AMF allows the customer to retain full control over mobility and connection management aspects regarding their subscribers. The B2B category aims to exploit the real benefits that network slicing enables, which is the ability to provide separate network partitions with independent management for different industry customers. What these customers value most is to perceive allocated 5 GC slices as dedicated, self-contained networks, under their own control. To that end, it is important for the operators to ensure that 5 GC slices are delivered with network capabilities equivalent to those offered by private 5 GC solutions (e.g., guaranteed SLA, traffic separation, controllable and configurable network), but at a much more reduced cost. This, together with the trust on operator's proven know-how on OAM activities, is what will drive B2B customers to ask for a 5 GC slice rather than purchasing a private 5 GC from a 3 rd party. As evidenced from Figure 11C-E, the customer's perception of having a dedicated network requires the operator to provision 5 GC slices with separate instances of some network functions. With the cloud-native design of 5 GC and the consolidation of NFV practices into container-based environments, operators are conducting trials in this direction, assessing how the allocation of dedicated network functions impacts the number of 5 GC slices that can be instantiated. This isolation vs scalability trade-off has demonstrated that the most optimal solution is to provision 5 GC slices with dedicated instances of UPF and SMF. This flavor, which corresponds to 5 GC slice type B1 (Figure 11C), will satisfy the service requirements of most industry customers [47; 48]. However, there also exist specific customers whose business requirements may make them ask operators for more tailored 5 GC slices, such as type B2 slices (Figure 11D) and type B3 slices (Figure 11E). Examples of these business requirements include the need for the customer to keep full control of QoS policies, or the need to get separate connection management of their subscribers. Putting the B2B and B2C category solutions into the timeline reflected in Figure 9, we can outline two things. First, in relation to the B2C category, we can see that type A2 slices may be commercially ready in the short term, while type A1 slices are expected in the long run. Secondly, in relation to the B2B category, we can see that all 5 GC slice types may be available in the medium term, once Rel-16 features are integrated into the 5 GC. Unlike the B2C category, where the difference between 5 GC slice types is subjected to the availability of 3 GPP solutions, in the B2B category the technology maturity of all the 5 GC slice types is the same. The decision of going for one or another solution is entirely dependent on the customer-specific business requirements.