Method Of Application Function (Af) Apparatus, Method Of Network Exposure Function (Nef) Apparatus, Method Of Unified Data Management (Udm) Apparatus, Method Of Access And Mobility Management Function (Amf) Apparatus, Method Of User Equipment (Ue), Method Of Policy Control Function (Pcf) Apparatus, Method Of Radio Access Network (Ran) Node, Af Apparatus, Nef Apparatus, Udm Apparatus, Amf Apparatus, Ue, Pcf Apparatus And Ran Node

Abstract: [Problem] One of the outstanding problems is how and in what format the 5GS network (or another network node) provides the network slice priority information and network slice grouping information to the UE and to other network nodes so that the UE can perform cell selection and cell reselection based on the network slice priority and network slice grouping information. This includes the provision of the network slice priority and possible network slice grouping to the 5GS itself in case of network slices owned by external service provider. [Solution] A method of an Application Function (AF) apparatus includes changing a priority related to Single Network Slice Selection Assistance Information (S-NSSAI), and sending the priority to a Network Exposure Function (NEF) apparatus.

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