US 12,245,090 B2
IMS voice support in network using EPS fallback and having 4G coverage holes
Lenaig Genevieve Chaponniere, La Jolla, CA (US); Abhishek Bhatnagar, San Diego, CA (US); Ajith Tom Payyappilly, San Diego, CA (US); Osama Lotfallah, San Diego, CA (US); and Vitaly Drapkin, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jul. 6, 2022, as Appl. No. 17/810,954.
Claims priority of provisional application 63/219,248, filed on Jul. 7, 2021.
Prior Publication US 2023/0014944 A1, Jan. 19, 2023
Int. Cl. H04L 65/1016 (2022.01); H04W 36/00 (2009.01); H04W 36/14 (2009.01)
CPC H04W 36/0079 (2018.08) [H04W 36/0066 (2013.01); H04W 36/1443 (2023.05)] 30 Claims
OG exemplary drawing
 
1. An apparatus for wireless communication at a user equipment (UE), comprising:
memory; and
at least one processor coupled to the memory, and based at least in part on information stored in the memory, the at least one processor is configured, individually or in any combination, to:
start a modified timer based on a number of failed attempts associated with voice services for an evolved packet system (EPS) network and based on a configuration parameter, wherein the modified timer is modified based on a default timer, and wherein the configuration parameter configures whether the UE is allowed to disable an S1 mode when starting the modified timer;
attempt to obtain the voice services based on one or more access technologies other than EPS; and
attach to or perform a tracking area update in the EPS network to obtain the voice services based on the modified timer.