Invention Grant
- Patent Title: Method and system for providing voice call continuity
- Patent Title (中): 提供语音通话连续性的方法和系统
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Application No.: US11872923Application Date: 2007-10-16
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Publication No.: US07885234B2Publication Date: 2011-02-08
- Inventor: Richard P. Ejzak
- Applicant: Richard P. Ejzak
- Applicant Address: US NJ Murray Hill
- Assignee: Alcatel-Lucent USA Inc.
- Current Assignee: Alcatel-Lucent USA Inc.
- Current Assignee Address: US NJ Murray Hill
- Agency: Fay Sharpe LLP
- Main IPC: H04Q7/00
- IPC: H04Q7/00

Abstract:
A method and system for providing circuit-switched to IP Multimedia Subsystem voice call continuity with a single radio are provided. The exemplary embodiment takes advantage of a standard RANAP signaling procedure called “directed retry” to perform a much better coordination between the change in radio mode and the transfer of the media path. With the use of “directed retry”, the transfer of the media path does not begin until the handover procedure is complete, thus significantly reducing the likely amount of media disruption.
Public/Granted literature
- US20090086674A1 METHOD AND SYSTEM FOR PROVIDING VOICE CALL CONTINUITY Public/Granted day:2009-04-02
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