US 12,225,423 B2
Method to avoid bad user experience by using rapid initial IMS registration
Rohit Naik, Hsin-Chu (TW); and Hsin-Jun Tang, Hsin-Chu (TW)
Assigned to MediaTek Inc., Hsinchu (TW)
Filed by MEDIATEK INC., Hsin-Chu (TW)
Filed on Jun. 6, 2022, as Appl. No. 17/833,622.
Prior Publication US 2023/0397070 A1, Dec. 7, 2023
Int. Cl. H04W 36/14 (2009.01); H04L 65/1016 (2022.01); H04L 65/1073 (2022.01); H04W 36/30 (2009.01); H04W 48/18 (2009.01); H04W 60/00 (2009.01)
CPC H04W 36/14 (2013.01) [H04L 65/1016 (2013.01); H04L 65/1073 (2013.01); H04W 36/30 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method, comprising:
initiating an IP Multimedia Subsystem (IMS) registration procedure by a user equipment (UE) in a mobile communication network, wherein the UE sends an initial IMS registration request to an IMS server over a first radio access type (RAT);
starting a guard timer upon sending the initial IMS registration request;
aborting the IMS registration procedure over the first RAT upon the guard timer expiry; and
transmitting another initial IMS registration request to the IMS server over a second RAT, wherein the UE establishes a connection with the network upon successful IMS registration over the second RAT, wherein the first RAT is a UE-preferred RAT, or the first RAT has a better radio signal strength or quality than the second RAT, and wherein the UE continues to handover the established connection to the first RAT in background.