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:
Sep. 15, 2026
Filed:
Jun. 07, 2021
Qualcomm Incorporated, San Diego, CA (US);
Shuhong Wang, Shanghai, CN;
Bing Leng, Shanghai, CN;
Jing Zhou, Shanghai, CN;
Jian Li, Shanghai, CN;
Xuefeng Chen, Shanghai, CN;
Yan Wang, Shanghai, CN;
Hao Zhang, Shanghai, CN;
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A method and apparatus improve Voice over Internet Protocol (VoIP) call setup success rate and latency. The method provides for attempting a mobile originated packet switched call, by a user equipment (UE), across a packet switched network with a transmission control protocol (TCP) connection of the Internet Protocol multimedia subsystem (IMS) session. A silent redial of the mobile originated packet switched call is performed in response to a failure of the mobile originated packet switched call, via a circuit switched network. A keep alive message is transmitted over the packet switched network after the circuit switched network call, which allows reconnection to the packet switched network.