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. 12, 2021
Filed:
Jun. 05, 2020
Applicant:
Blackberry Limited, Waterloo, CA;
Inventors:
Hamid Syed Mahmood, Kanata, CA;
Mathurin Wadjeu, Kanata, CA;
Assignee:
BlackBerry Limited, Waterloo, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04W 36/00 (2009.01); H04W 60/00 (2009.01); H04W 36/14 (2009.01); H04W 60/04 (2009.01); H04W 48/18 (2009.01); H04W 88/06 (2009.01); H04W 76/18 (2018.01); H04W 76/16 (2018.01); H04W 76/19 (2018.01);
U.S. Cl.
CPC ...
H04W 36/0022 (2013.01); H04W 36/14 (2013.01); H04W 48/18 (2013.01); H04W 60/005 (2013.01); H04W 60/04 (2013.01); H04W 76/16 (2018.02); H04W 76/18 (2018.02); H04W 76/19 (2018.02); H04W 88/06 (2013.01);
Abstract
A method at a user equipment including detecting that a circuit switched (CS) call has been requested at the user equipment; if a most recent registration attempt or registration update attempt with a network of a first radio access technology (RAT) resulted in an abnormal state, registering with a network of a second RAT; and initiating the CS call with the network of the second RAT.