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.