US Patent No. 11,071,152

ACCESS BARRING AND RADIO RESOURCE CONTROL CONNECTION IN NEW RADIO TO LONG-TERM EVOLUTION VOICE FALLBACK


Patent No. 11,071,152
Issue Date July 20, 2021
Title Access Barring And Radio Resource Control Connection In New Radio To Long-term Evolution Voice Fallback
Inventorship 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)
Osama Lotfallah, San Diego, CA (US)
Assignee QUALCOMM Incorporated, San Diego, CA (US)

Claim of US Patent No. 11,071,152


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.