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1. (WO2017155710) EFFICIENT TRANSITION BETWEEN A TRUSTED WLAN AND A WWAN

Pub. No.:    WO/2017/155710    International Application No.:    PCT/US2017/019363
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Sat Feb 25 00:59:59 CET 2017
IPC: H04W 36/00
H04W 88/06
Applicants: QUALCOMM INCORPORATED
Inventors: ZHANG, Juan
PAYYAPPILLY, Ajith Tom
SANTHANAM, Arvind Vardarajan
ZHAO, Suli
VEEREPALLI, Sivaramakrishna
Title: EFFICIENT TRANSITION BETWEEN A TRUSTED WLAN AND A WWAN
Abstract:
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may prevent rejected attachment requests when connecting to a trusted wireless local area network (WLAN) and from a wireless wide area network (WWAN). For example, an attachment packet data network (PDN) connection may be maintained with the WWAN while connected to the trusted WLAN. In some cases, the connection used to maintain the attachment may be an internet protocol (IP) multimedia subsystem (IMS) connection. Alternatively, the UE may determine that the WLAN connection is a trusted connection and deactivate the WWAN connection. Should the WLAN become unavailable the UE may reactivate the connection with the WWAN.