Qualcomm Incorporated

Zhong Ren

Shyamal Ramachandran

Abhishek Bhatnagar

Vitaly Drapkin

Lenaig Genevieve Chaponniere

Osama Lotfallah

Tom Chin

Kuo-Chun Lee

Xipeng Zhu

Masato Kitazoe

Arvind Vardarajan Santhanam

Min Wang

Thomas Klingenbrunn

Hariharan Sukumar

Vamsi Dokku

Cherng-Shung Hsu

Vidula Rajeev Kurundkar

Xinli Song

Kanuganti Rajeswar Reddy

Anisha Elizabeth Jonas

Zhiyuan Lu

Vamsi Krishna Dokku

This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for wireless communication by a user equipment (UE). In one aspect, the UE is configured to generate a handover request related to a wireless communication session between the UE and a wireless local area network (WLAN) device, and establish, independent of an access check, a radio resource control (RRC) connection with a base station. In another aspect, the UE is configured to perform an access check based on a bias value, and establish an RRC connection with a base station based on a result of the access check. The access check performed based on a communication indicator related to a wireless communication session between the UE and a WLAN device.

Access check optimization for handover from wireless local area network (WLAN) and other inter radio access technology (IRAT)

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify that a radio resource control connection is to be established for evolved packet system fallback or inter radio access technology fallback from New Radio for a voice call. The UE may determine that an establishment cause received from a network access stratum (NAS) layer does not indicate high priority access. The UE may override 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. The UE may perform 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. Numerous other aspects are provided.

Access barring and radio resource control connection in new radio to long-term evolution voice fallback

Methods and apparatus are provided for avoiding attempts by a UE to attach to a RAT network when that RAT network is unavailable. According to certain aspects, the UE may detect scenarios when the RAT network is unavailable and take preemptive action to prevent the UE from attempting to acquire service on that RAT. For example, the UE may effectively remove that RAT from a list of supported RATs by sending a UE capability message indicating that RAT is not supported, which may prevent network-initiated transitions of the UE to that RAT. The UE may also remove the unavailable RAT from an internal list of supported RATs, which may prevent UE-initiated transitions to that RAT.

Methods and systems for avoiding transitions between radio access technologies when packet data networks are inaccessible

Certain aspects of the present disclosure relate to methods and apparatus for improving data service availability. Certain aspects provide methods and apparatus for wireless communications by a UE including determining, while the UE is in a coverage area of a first network, that a connection to a second network, comprising a packet data network (PDN), is disconnected locally, and taking at least one action to avoid a rejection of a request to connect to the second network.

Methods and apparatus for improving data service availability

Methods, systems, apparatuses and devices are described for managing a call during radio link failure. In one embodiment, radio link failure over a radio access technology may be detected during or after a call setup procedure. A public land mobile network and an equivalent public land mobile network may be selected. An initial search for cells of the radio access technology may be performed over the selected public land mobile network and the equivalent public land mobile network. The initial search may be performed once or twice based on a configurable parameter.

Enhance performance of making an emergency call during radio link failure over radio access technology

Growing community of inventors

San Diego, CA, United States of America

Zhong Ren