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Voice Call Handover Mechanisms in Next-Generation 3GPP Systems

Explore voice call handover mechanisms in next-generation 3GPP systems, including single-radio continuity and fallback to legacy networks for seamless transitions and user experience enhancement.

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Voice Call Handover Mechanisms in Next-Generation 3GPP Systems

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

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

  3. An Overview of Next-Generation 3GPP System

  4. 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

  5. Voice Call Transfer from E-UTRAN to UTRAN/GERAN

  6. Voice Call Transfer from E-UTRAN to UTRAN/GERAN

  7. Voice Call Transfer From E-UTRAN to CDMA2000 1xRTT

  8. Voice Call Transfer From E-UTRAN to CDMA2000 1xRTT

  9. Voice Call Handing With Fallback to 2G/3G

  10. Voice Call Handing With Fallback to 2G/3G

  11. Voice Call Handing With Fallback to 2G/3G

  12. 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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