公开(公告)号：US10390384B2

公开(公告)日：2019-08-20

申请号：US15138720

申请日：2016-04-26

Applicant: MediaTek Inc.

Inventor： Yu-Cheng Huang ,  Chien-Chun Huang-Fu ,  Yu-Syuan Jheng ,  Jou-Man Lin

IPC: H04W76/30 ,  H04W76/16 ,  H04W36/00 ,  H04W76/18 ,  H04W76/50 ,  H04W60/00 ,  H04W60/06

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 first network supporting only Packet-Switched (PS) services or a second network supporting Circuit-Switched (CS) services. The controller receives a rejection message of a Tracking Area Updating (TAU) procedure from the first network via the wireless transceiver when a Circuit Switch Fallback (CSFB)-related call originated from or terminated to the mobile communication device is pending, determines whether the rejection message includes a predetermined rejection cause, and in response to the rejection message including the predetermined rejection cause, selects the second network to make the CSFB-related call via the wireless transceiver without re-attaching to the first network.