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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.:

US 11917516 B1

PDFFull Text
Date of Patent:
Feb. 27, 2024

Filed:

May. 03, 2021

Internet protocol multimedia subsystem emergency calls for roaming user equipments

Applicant:

Telefonaktiebolaget Lm Ericsson (Publ), Stockholm, SE;

Inventors:

Fredrik Lindholm, Tokyo, JP;

Ralf Keller, Würselen, DE;

Susana Fernandez Alonso, Madrid, ES;

Ivo Sedlacek, Hovorcovice, CZ;

Assignee:

TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm, SE;

Attorney:

Sage Patent Group

Primary Examiner:

Khaled M Kassim

Assistant Examiner:

Kai Chang

Int. Cl.
CPC ...
H04W 4/90 (2018.01); H04W 76/50 (2018.01); H04L 65/1016 (2022.01); H04L 65/1069 (2022.01); H04W 60/00 (2009.01); H04L 65/1073 (2022.01); H04L 65/1104 (2022.01); H04M 3/51 (2006.01); H04W 80/10 (2009.01); H04W 8/20 (2009.01); H04W 92/02 (2009.01); H04W 12/06 (2021.01); H04W 12/72 (2021.01); H04L 65/1045 (2022.01);
U.S. Cl.
CPC ...
H04W 4/90 (2018.02); H04L 65/1016 (2013.01); H04L 65/1069 (2013.01); H04L 65/1073 (2013.01); H04L 65/1104 (2022.05); H04W 60/00 (2013.01); H04W 76/50 (2018.02); H04L 65/1045 (2022.05); H04M 3/5116 (2013.01); H04W 8/20 (2013.01); H04W 12/06 (2013.01); H04W 12/72 (2021.01); H04W 80/10 (2013.01); H04W 92/02 (2013.01);
Abstract

A method of operating a user equipment ('UE') to handle an internet protocol multimedia subsystem (“IMS”) emergency call can include sending a session initiation protocol (“SIP”) REGISTER request relating to an emergency registration to a proxy call session control function (“P-CSCF”) of an IMS network. The method can further include, responsive to sending the SIP REGISTER request, receiving a response from the P-CSCF. The method can further include, responsive to receiving the response, performing an action based on the response.

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