Invention Grant
US09326194B2 Method and apparatus for setup of a circuit switched call during circuit switched fallback
有权
在电路交换回退期间设置电路交换呼叫的方法和装置
- Patent Title: Method and apparatus for setup of a circuit switched call during circuit switched fallback
- Patent Title (中): 在电路交换回退期间设置电路交换呼叫的方法和装置
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Application No.: US14024144Application Date: 2013-09-11
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Publication No.: US09326194B2Publication Date: 2016-04-26
- Inventor: Muhammad Khaledul Islam , Jeffrey William Wirtanen
- Applicant: BlackBerry Limited
- Applicant Address: CA Warerloo
- Assignee: BlackBerry Limited
- Current Assignee: BlackBerry Limited
- Current Assignee Address: CA Warerloo
- Agency: Moffat & Co.
- Main IPC: H04W36/00
- IPC: H04W36/00 ; H04W76/02

Abstract:
A method, at a user equipment (‘UE’), the method: sending a request to a first network for Circuit Switched Fallback (‘CSFB’); receiving, responsive to the request, redirection information; acquiring a second network based on the redirection information; initiating establishment of Circuit Switched (‘CS’) voice radio bearers with the second network; waiting for a predetermined event to occur; after the predetermined event has occurred, establishing a Packet Switched (‘PS’) connection with the second network. Further, a method, at a network element, the method receiving a request for Circuit Switched Fallback (‘CSFB’) from a user equipment (‘UE’); sending, to the UE, redirection information; receiving a Routing Area Update (‘RAU’) message from the UE; waiting for a predetermined event to occur; upon the predetermined event occurring, responding to the RAU message.
Public/Granted literature
- US20150071167A1 METHOD AND APPARATUS FOR SETUP OF A CIRCUIT SWITCHED CALL DURING CIRCUIT SWITCHED FALLBACK Public/Granted day:2015-03-12
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