sented earlier in this chapter, is the higher layer functional split. The F1-interface protocol stack is shown in Figure 5.12. 5.5 Network Slicing GTP-U GTP-U Figure 5.12 F1-interface protocol stacks. Network Slicing Network slicing in 5G is intended to address services with different kinds of require- ments, while at the same time improving the efficiency of the network. Some services require low latencies and need to address local service content, some require high mobil- ity, while other services are close to the current mobile broadband type characteristic without specific requirements on reliability or latency. The slicing principles in 5G allow a UE to belong to more than a single slice, while still maintaining only a single signaling connection with the network. The UE is provided information on the available slices when registering for the net- work (via NAS signaling), and a single UE may be configured for up to eight difference slices. Once a PDU session is set up, the UE is then signaled the Network Slice Selection Assistance Information (NSSAI), assuming this has been provided earlier to the UE. On the basis of this information, the network will select the appropriate slice instance (and related resources), with the AMF coordinating the actions in the 5G core side. There is one AMF that is common for all the slices a single UE has. This AMF will obtain information on which slices are allowed for a given subscription by interfacing with the Network Slice Selection Function (NSSF). The 5G slicing approach allows a single UE to access both services belonging to a specific slice as well as services which will be han- dled as the "normal" traffic. Earlier generations were using user-specific priorities, which would mean the same handling for all services provided for a single UE. On the 5G-RAN, not too much has been specified in terms of reserving the resources for the particular slice, but in general the scheduler is in a key position to ensure that each slice is provided with suitable handling and resour