公开(公告)号：US20230217321A1

公开(公告)日：2023-07-06

申请号：US18080019

申请日：2022-12-13

Applicant: MEDIATEK INC.

Inventor： YUAN-CHIEH LIN ,  Chi-Hsien Chen

IPC: H04W36/00 ,  H04L69/08 ,  H04W76/22

CPC classification number: H04W36/0022 ,  H04L69/08 ,  H04W76/22

Abstract: A method of handling interworking from 5G system (5GS) to 2/3G for an PDU session with a 3GPP EPS PDN leg is proposed. Upon intersystem change from S1 mode to A/Gb mode or Iu mode, for a PDN connection which was established as a user plane resource of an MA PDU session: if the SM activates a PDP context using parameters from the default EPS bearer context of the PDN connection, then the SMF can initiate a network-requested PDU session release procedure over non-3GPP access or perform a local release of the MA PDU session; the UE can perform a local release of the MA PDU session. Otherwise, the SMF can initiate a network-requested PDU session modification procedure over 5G non-3GPP access to move traffic of the MA PDU session to 5G non-3GPP access, or initiate a network-requested PDU session release procedure over non-3GPP access.