The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 2025
Filed:
Jun. 30, 2020
Qualcomm Incorporated, San Diego, CA (US);
Guojing Liu, Beijing, CN;
Dongsheng Wang, Beijing, CN;
Chaofeng Hui, Beijing, CN;
Fojian Zhang, Shenzhen, CN;
Haibo Liu, Shanghai, CN;
Xiaomeng Lu, Shanghai, CN;
Xuesong Chen, Beijing, CN;
QUALCOMM Incorporated, San Diego, CA (US);
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.