公开(公告)号：US20230217545A1

公开(公告)日：2023-07-06

申请号：US17999099

申请日：2020-06-30

Applicant: Guojing LIU ,  Dongsheng WANG ,  Chaofeng HUl ,  Fojian ZHANG ,  Haibo LIU ,  Xiaomeng LU ,  Xuesong CHEN ,  QUALCOMM Incorporated

Inventor： Guojing LIU ,  Dongsheng WANG ,  Chaofeng HUI ,  Fojian ZHANG ,  Haibo LIU ,  Xiaomeng LU ,  Xuesong CHEN

IPC: H04W76/50 ,  H04W76/18

CPC classification number: H04W76/50 ,  H04W76/18

Abstract: Aspects of the present disclosure provide techniques for improving emergency calls by a user equipment (UE) in certain scenarios. The techniques generally include receiving a trigger for the UE to perform a circuit switched (CS) emergency call via a first subscriber identity module (SIM) that is serving as a default data subscriber (DDS), attempting the CS emergency call via the first SIM, detecting a failure to perform the CS emergency call via the first SIM, and re-attempting the CS emergency call via a second SIM, in response to the detection.