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 11659469 B1

Date of Patent:

May. 23, 2023

Filed:

Sep. 25, 2020

Restoration of serving call session control and application server function

Applicant:

T-mobile Usa, Inc., Bellevue, WA (US);

Inventors:

Zeeshan Jahangir, Snoqualmie, WA (US);

Shujaur Mufti, Snoqualmie, WA (US);

Assignee:

T-Mobile USA, Inc., Bellevue, WA (US);

Attorney:

Lee & Hayes, P.C.

Primary Examiner:

Abdelillah Elmejjarmi

Int. Cl.

CPC ...

H04L 1/00 (2006.01); H04W 40/28 (2009.01); H04L 65/1073 (2022.01); H04L 65/1016 (2022.01); H04L 61/503 (2022.01); H04L 65/1045 (2022.01); H04L 65/1104 (2022.01); H04L 67/53 (2022.01); H04L 45/745 (2022.01); H04L 67/306 (2022.01); H04W 8/00 (2009.01); H04L 61/4511 (2022.01); H04L 61/4588 (2022.01); H04L 101/385 (2022.01); H04W 8/04 (2009.01); H04W 60/04 (2009.01); H04W 80/10 (2009.01); H04W 88/02 (2009.01);

U.S. Cl.

CPC ...

H04W 40/28 (2013.01); H04L 45/745 (2013.01); H04L 61/503 (2022.05); H04L 65/1016 (2013.01); H04L 65/1045 (2022.05); H04L 65/1073 (2013.01); H04L 65/1104 (2022.05); H04L 67/306 (2013.01); H04L 67/53 (2022.05); H04W 8/005 (2013.01); H04L 61/4511 (2022.05); H04L 61/4588 (2022.05); H04L 2101/385 (2022.05); H04W 8/04 (2013.01); H04W 60/04 (2013.01); H04W 80/10 (2013.01); H04W 88/02 (2013.01);

Abstract

A communication session for a UE can be restored in the event of serving call session control function (S-CSCF) node unavailability and/or application server (AS) unavailability by storing, prior to IMS unavailability, attribute-value pairs (AVPs) at a home subscriber server (HSS). These AVPs can be used independently by individual IMS nodes to restore a communication session for a UE due to an unavailable IMS node. When a first S-CSCF node becomes unavailable, a proxy CSCF (P-CSCF) node can send a SIP request originating from the UE to a second S-CSCF node. The second S-CSCF node can then send a request to the HSS for an identifier of an AS associated with the UE. Upon receipt of the AS identifier (e.g., an active AS name AVP) from the HSS, the second S-CSCF node can send the SIP request to the AS in order to restore the communication session for the UE.

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