US 11,071,152 B2
Access barring and radio resource control connection in new radio to long-term evolution voice fallback
Min Wang, San Diego, CA (US); Xipeng Zhu, San Diego, CA (US); Masato Kitazoe, Tokyo (JP); Lenaig Genevieve Chaponniere, La Jolla, CA (US); Zhong Ren, San Diego, CA (US); Xinli Song, San Diego, CA (US); Tom Chin, San Diego, CA (US); and Osama Lotfallah, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Feb. 4, 2020, as Appl. No. 16/781,535.
Claims priority of provisional application 62/804,598, filed on Feb. 12, 2019.
Prior Publication US 2020/0260504 A1, Aug. 13, 2020
Int. Cl. H04W 76/10 (2018.01); H04W 48/02 (2009.01); H04W 36/00 (2009.01)
CPC H04W 76/10 (2018.02) [H04W 36/0022 (2013.01); H04W 48/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of wireless communication performed by a user equipment (UE), comprising:
identifying that a radio resource control (RRC) connection is to be established for evolved packet system (EPS) fallback or inter radio access technology (RAT) fallback from new radio (NR) for a voice call;
determining, based at least in part on identifying that the RRC connection is to be established for EPS fallback or inter RAT fallback from NR for the voice call, that an establishment cause received from a network access stratum (NAS) layer does not indicate high priority access;
overriding the establishment cause such that the establishment cause indicates a mobile originated (MO) voice call based at least in part on determining that the establishment cause received from the NAS layer does not indicate high priority access; and
performing an access barring check of an MO voice call based at least in part on overriding the establishment cause such that the establishment cause indicates an MO voice call.