In some 4G/5G networks, 4G to 5G or 5G to 4G handovers are facilitated using Idle-mode handover techniques due to an unavailability of radio network element readiness to deploy Connected-mode handovers. However, Idle-mode handovers can lead to incorrect Packet Data Network (PDN) session deletion by a Session Management Function (SMF) during an Idle-mode 4G to 5G handover. Techniques herein address this issue by providing a solution in which an Access and Mobility Management Function (AMF) is to wait for the session management (SM) context creation procedure to complete before performing registration of a user equipment (UE) on a Unified Data Management (UDM)/Home Subscriber Server (HSS).
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Devulacheruvu Nageswararao, Pavan Kumar; P.V.M.K.P, Anjaneyulu; and Abraham, Jis, "METHOD TO OVERCOME PDN SESSION DELETION DURING 4G TO 5G IDLE MODE HANDOVER", Technical Disclosure Commons, (October 12, 2021)