Invention Grant
- Patent Title: Network cell transitions for VoLTE devices at call initiation
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Application No.: US14066619Application Date: 2013-10-29
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Publication No.: US10009819B2Publication Date: 2018-06-26
- Inventor: Samy Khay-Ibbat , Tarik Tabet
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Dickinson Wright RLLP
- Main IPC: H04W28/02
- IPC: H04W28/02 ; H04W36/30 ; H04W40/08 ; H04W48/18

Abstract:
Apparatus and methods of performing a network cell transition for a voice over long term evolution (VoLTE) capable mobile device. Initially, the mobile device can detect a call initiation event. Thereafter, the mobile device determines whether a radio signal power associated with its serving LTE network base station is less than a radio access technology (RAT) specific threshold (i.e., an LTE-specific threshold). In a scenario where the radio signal power is less than the RAT-specific threshold the mobile device can effectuate a transition to an available neighbor network base station employing a legacy RAT, prior to establishing a voice call. When the mobile device is in a radio resource control (RRC) connected mode the network cell transition may be associated with an induced network handover procedure. Alternatively, when the mobile device is in an RRC idle mode the network cell transition may be associated with network reselection procedure.
Public/Granted literature
- US20140126544A1 NETWORK CELL TRANSITIONS FOR VOLTE DEVICES AT CALL INITIATION Public/Granted day:2014-05-08
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