US 11,689,976 B2
Techniques for improving VoNR-to-VoLTE fallback
Yongsheng Shi, San Diego, CA (US); Xipeng Zhu, San Diego, CA (US); Haris Zisimopoulos, London (GB); Kirankumar Bhoja Anchan, San Diego, CA (US); Lenaig Genevieve Chaponniere, La Jolla, CA (US); Shanshan Wang, San Diego, CA (US); Arvind Vardarajan Santhanam, San Diego, CA (US); Mona Agrawal, San Diego, CA (US); Aziz Gholmieh, Del Mar, CA (US); and Tom Chin, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Sep. 30, 2021, as Appl. No. 17/489,964.
Application 17/489,964 is a continuation of application No. 16/594,374, filed on Oct. 7, 2019, granted, now 11,190,993.
Claims priority of provisional application 62/743,409, filed on Oct. 9, 2018.
Prior Publication US 2022/0022109 A1, Jan. 20, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 36/00 (2009.01); H04L 65/1073 (2022.01); H04L 65/1104 (2022.01); H04W 36/14 (2009.01); H04W 48/16 (2009.01)
CPC H04W 36/0079 (2018.08) [H04L 65/1073 (2013.01); H04L 65/1104 (2022.05); H04W 36/14 (2013.01); H04W 48/16 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A method of wireless communications by a user equipment (UE), comprising:
communicating with and camping on a next generation node B (gNB) in a 5G new radio (NR) system;
initiating a voice call with the gNB;
receiving a 5G NR-to-long term evolution (LTE) handover command in response to initiating the voice call;
performing a handover procedure in response to the handover command;
detecting a failure in the handover procedure; and
taking one or more actions in response to detecting the failure in the handover procedure, wherein taking one or more actions comprises performing a cell selection or re-selection procedure to determine a new cell to camp on, wherein performing the cell selection or re-selection procedure comprises excluding the gNB from being selected based on an NR-to-LTE voice fallback indicator received in the handover command.