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Voice Call Handover Mechanisms in Next-Generation 3GPP Systems Speaker : Chi-Ju Chiu Date : 2009/12/24
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Outline An Overview of Next-Generation 3GPP System Voice Call Handing With Fallback to 2G/3G IMS-Based Voice Call Continuity Conclusion
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An Overview of Next-Generation 3GPP System
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Single-Radio Voice Call Continuity (SR-VCC) Voice calls need to be transferred across service domains and radio access technologies with so called single-radio Mobile Terminals that can not support simultaneous signaling on both E-UTRAN and UTRAN/GERAN radio channels Single Radio voice call continuity and handoff E-UTRAN and UTRAN/GERAN E-UTRAN and CDMA2000 1xRTT
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Voice Call Transfer from E-UTRAN to UTRAN/GERAN
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Voice Call Transfer From E-UTRAN to CDMA2000 1xRTT
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Voice Call Handing With Fallback to 2G/3G
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Conclusion We present and explain these handover mechanisms, and identify the key motivation behind them It is shown that when voice services are supported over E- UTRAN, the so-called SR-VCC mechanisms can be used to seamlessly hand over voice calls to legacy radio technologies UTRAN, GERAN, and 1xRTT On the other hand, when no voice services are supported over E-UTRAN, CS fallback mechanisms can be used to transfer the user to a legacy radio access that supports conventional voice services over the CS domain
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