ts. One example is given in Figure 12.12, where the UE has three communication paths 12.4 Key Technologies to Enable Service-Oriented RAN Slicing (11|1)) Subsystem 1 Subsystem 2 Figure 12.13 Dual-connectivity with different RAN subsystems. toward the different RAN subsystems that it supports. The RAN may allocate semi-static radio resources for which the UE performs autonomous resource selection, or scheduled resources to support the data transmission for different RAN subsystems. Resource sharing and aggregation in dual connectivity: Dual connectivity can be used to provide aggregated resources for some slices while it is also allowed for the RAN node to support some slices via single link. One example is given in Figure 12.13, where the RAN subsystem1 can be supported by both MN and SN, while subsystem2 is supported only by SN. In order to allow multiple connectivity across different subsystems to achieve system efficiency, the following should be considered: - The MN should be aware of UE-supported RAN subsystems and SN-supported subsys- tems for SN selection. - When the UE is within the SN coverage, it may access the RAN subsystem1 and RAN subsystem2 simultaneously. When the UE moves out of the RAN subsystem coverage, service continuity can be ensured if the traffic of the unsupported slice is allowed to be switched to another slice. In addition, inter-slicing data forwarding is needed. 12.4.4 Slice-Aware Connected UE Mobility Network controlled mobility should take slice information into account. Specifically, the RAN will take RAN subsystems supported by neighbor cells as one factor to select the proper target cell for the connected UE. The RAN node and its neighboring nodes may exchange their supported RAN subsystems with each other. Based on this, the RAN can endeavor to support the service connectivity for this UE. When the UE moves within areas where the RAN subsystem is supported, service continuity could be ensured. However, when the UE moves to areas that do not support the RAN subsystem, as Figure 1