US 10,893,444 B2
Voice fallback in 5G NR
Xipeng Zhu, San Diego, CA (US); Masato Kitazoe, Hachiouji (JP); Gavin Bernard Horn, La Jolla, CA (US); Shyamal Ramachandran, San Diego, CA (US); Arvind Vardarajan Santhanam, San Diego, CA (US); Tom Chin, San Diego, CA (US); Min Wang, San Diego, CA (US); and Kuo-Chun Lee, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jan. 8, 2020, as Appl. No. 16/737,639.
Claims priority of provisional application 62/797,663, filed on Jan. 28, 2019.
Prior Publication US 2020/0245195 A1, Jul. 30, 2020
Int. Cl. H04W 4/00 (2018.01); H04W 36/00 (2009.01); H04W 36/12 (2009.01); H04W 36/08 (2009.01)
CPC H04W 36/0022 (2013.01) [H04W 36/08 (2013.01); H04W 36/12 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A method of wireless communication performed by an apparatus of a user equipment (UE), comprising:
receiving, from a first base station (BS) associated with a fifth generation New Radio (5G NR) radio access technology (RAT), a command of mobility from the 5G NR RAT to a second RAT;
determining the command of mobility is for voice fallback;
attempting to communicatively connect with a second BS associated with the second RAT:
detecting a failure in an attempt to communicatively connect with the second BS; and
attempting to communicatively connect with a third BS associated with the second RAT based at least in part on detecting the failure in the attempt to communicatively connect with the second BS and based at least in part on determining the command of mobility is for voice fallback.