Invention Grant
- Patent Title: Handling of timer expiry for MT CSFB
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Application No.: US16489222Application Date: 2018-06-27
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Publication No.: US11044786B2Publication Date: 2021-06-22
- Inventor: Nitin Kuppelur , Deepak Dash , Robert Zaus , Roland Gruber
- Applicant: APPLE INC.
- Applicant Address: US CA Cupertino
- Assignee: APPLE INC.
- Current Assignee: APPLE INC.
- Current Assignee Address: US CA Cupertino
- Agency: Stoel Rives LLP
- International Application: PCT/US2018/039800 WO 20180627
- International Announcement: WO2019/005996 WO 20190103
- Main IPC: H04W88/02
- IPC: H04W88/02 ; H04W76/25 ; H04W4/029 ; H04W76/38 ; H04W8/06 ; H04W8/08 ; H04W8/24 ; H04W68/00

Abstract:
Apparatuses and computer-readable storage media for handling timers for mobile terminated circuit-switched fallback (MT CSFB) calls. An apparatus for a user equipment (UE) includes processing circuitry operably coupled to a data storage device. The data storage device is configured to store a value of an extended service request for mobile terminated services (EXT-MT) timer. The value of the EXT-MT timer is less than a value of a guard timer of a Visitor Location Register (VLR). The processing circuitry is configured to start the EXT-MT timer and generate an extended service request message to be transmitted to a Mobility Management Entity (MME) responsive to a paging for an MT CSFB call, and attempt to select a radio access technology of a different type of network if the EXT-MT timer expires before the UE successfully performs inter system change and a circuit switched fallback cancellation request was not received from a subscriber.
Public/Granted literature
- US20200008269A1 IMPROVED HANDLING OF TIMER EXPIRY FOR MT CSFB Public/Granted day:2020-01-02
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