Voice Call Handover Mechanisms in Next-Generation 3GPP Systems Speaker ： Chi-Ju Chiu Date ： 2009/12/24.

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Presentation transcript:

Voice Call Handover Mechanisms in Next-Generation 3GPP Systems Speaker ： Chi-Ju Chiu Date ： 2009/12/24

Outline An Overview of Next-Generation 3GPP System Voice Call Handing With Fallback to 2G/3G IMS-Based Voice Call Continuity Conclusion

An Overview of Next-Generation 3GPP System

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

Voice Call Transfer from E-UTRAN to UTRAN/GERAN

Voice Call Transfer From E-UTRAN to CDMA2000 1xRTT

Voice Call Handing With Fallback to 2G/3G

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