公开(公告)号：US09788208B2

公开(公告)日：2017-10-10

申请号：US14986230

申请日：2015-12-31

Applicant: MediaTek Inc.

Inventor： Shih-Chieh Liao ,  Tuan-Che Chen

IPC: H04M1/66 ,  H04W12/08 ,  H04W76/04

CPC classification number: H04W12/08 ,  H04L63/20 ,  H04W12/00 ,  H04W76/27

Abstract: A mobile communication device including a wireless transceiver and a controller is provided. The wireless transceiver performs wireless transmission and reception to and from a service network. The controller determines, during an ongoing Non-Access Stratum (NAS) procedure, whether a SECURITY MODE COMMAND message received from the service network via the wireless transceiver fails an integrity protection check and no RRC CONNECTION RELEASE message has been received from the service network via the wireless transceiver, or whether transmission of a SECURITY MODE COMPLETE message to the service network via the wireless transceiver has failed. Also, the controller locally releases a connection to the service network when the SECURITY MODE COMMAND message fails the integrity protection check and no RRC CONNECTION RELEASE message has been received, or when the transmission of the SECURITY MODE COMPLETE message has failed.

公开(公告)号：US09838860B2

公开(公告)日：2017-12-05

申请号：US14991443

申请日：2016-01-08

Applicant: MediaTek Inc.

Inventor： Tuan-Che Chen ,  Chin-Han Wang ,  Lu-Tsung Chang

IPC: H04W4/22 ,  H04W72/10 ,  H04W48/14 ,  H04W76/00 ,  H04W76/02

CPC classification number: H04W4/22 ,  H04W4/90 ,  H04W48/14 ,  H04W48/16 ,  H04W60/00 ,  H04W76/18 ,  H04W76/50

Abstract: A method for efficient wireless communications performed by a communications apparatus includes determining a cell according to a low priority list; and performing an attach procedure to try to attach to the cell for establishing an emergency call through the cell. The low priority list comprises information regarding a public land mobile network (PLMN) identity (ID), tracking area (TA) code, a cell ID and/or a closed subscriber group (CSG) ID of at least one attempted cell through which the communications apparatus has attempted but failed to establish an emergency call.