Invention Grant
- Patent Title: Procedures for 3GPP circuit switched fallback
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Application No.: US14791687Application Date: 2015-07-06
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Publication No.: US09832686B2Publication Date: 2017-11-28
- Inventor: Farouk Belghoul , David Boettger , Krisztian Kiss , Dawei Zhang , Tarik Tabet , Rafael L. Rivera-Barreto , Huarui Liang
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Meyertons Hood Kivlin Kowert & Goetzel, P.C.
- Agent Jeffrey C. Hood
- Main IPC: H04L12/28
- IPC: H04L12/28 ; H04W36/00 ; H04W76/04 ; H04W48/16 ; H04W36/14 ; H04W48/18 ; H04W88/06

Abstract:
Mobile devices, base stations, and/or relay stations may implement CSFB (circuit switched fallback) operations by using RRC (radio resource control) connection release and/or handover procedures. If the CSFB RAT (radio access technology) target is not well configured, the UE may be informed and provisioned by the NW during a CSFB procedure with the information to return to LTE. Having this information, the UE may perform an autonomous search of LTE cells after the CSFB call release, speeding up return to LTE. To minimize potential call failures during CSFB, the UE may autonomously perform an additional cell search, in particular a search for cells on a RAT different from the initial target RAT. This creates an opportunity to prevent call failure of CSFB calls that would otherwise fail. The UE may be provisioned during the CSFB procedure with information to perform the additional cell search, should such a search be necessary.
Public/Granted literature
- US20160007240A1 Procedures for 3GPP Circuit Switched Fallback Public/Granted day:2016-01-07
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