5.21.4.1 General

Network Function/NF Service Context Transfer Procedures allow transfer of Service Context of a NF/NF Service from a Source NF/NF Service Instance to the Target NF/NF Service Instance e.g. before the Source NF/NF Service can gracefully close its NF/NF Service. Service Context Transfer procedures are supported as specified in clause 4.26 of TS 23.502 [3].

Source NF / OA&M system determines when Source NF needs to transfer UE contexts to an NF in another NF set. Source NF should initiate this only for UE(s) that are not active in order to limit and avoid impacting services offered to corresponding UE(s).