5G语音解决方案

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1、5G语音解决方案•2019-031©2018Nokia5G语音可选方案回落2G/3G进行CS语音①选项3/3a/3x支持2/3G提供语音CSFB②选项7/7a/7x不支持（无MSC接口）③选项5不支持（无MSC接口）LTE进行IMS语音VoLTE①选项3/3a/3x支持VoLTE，可选的NRPDCPVoeLTE②选项7/7a/7x支持VoeLTE③选项5支持VoeLTE5G语音可选方案回落LTE进行IMS语音EPSFB①NR切换或重定向至LTE，CN由5GC切换为EPC（VoLTE）②适用于选项2和选项4/4aLT

2、E提供语音回落LTE进行IMS语音RATFB①NR切换或重定向至LTE，CN保持5GC不变（VoeLTE）②适用于选项2和选项4/4aLTE/EPC提供IMS语音双注册①UE同时注册EPC和5GC（VoLTE）②适用于选项2和选项4/4aNR/5GC提供IMS语音NR提供语音VoNR①离开NR覆盖时，切换至VoeLTE（规范尚未冻结）②适用于选项2和选项4/4a2©2018NokiaVoNR、RATFB、EPSFBVoNRRATFBEPSFB3©2018NokiaRATFB4.13.6.2InterRATFallb

3、ackin5GCforIMSvoiceFigure4.13.6.2-1describestheRATfallbackprocedurein5GCforIMSvoice.5.SourceNG-RANinitiatesXnbasedWhentheUEisservedbythe5GC,theUEhasoneInterNG-RANhandover(seeormoreongoingPDUSessionseachincludingoneclause4.9.1.2)orN2basedinterNG-ormoreQoSFlows.

4、TheservingPLMNAMFhasRANhandover(seeclause4.9.1.3),orsentanindicationtowardstheUEduringtheredirectiontoE-UTRAconnectedtoRegistrationprocedurethatIMSvoiceoverPS5GC(seeclause4.2.6).TheSMFsessionissupported,seeclause5.16.3.10inreportschangeoftheRATtypeifTS23.501[2

5、]andtheUEhasregisteredintheIMS.subscribedbyPCF.4©2018NokiaEPSFB4.13.6.1EPSfallbackforIMSvoiceFigure4.13.6.1-1describestheEPSfallbackprocedureforIMSvoice.WhentheUEisservedbythe5GSystem,theUEhasoneormoreongoingPDUSessionseachincludingoneormoreQoSFlows.Theserving

6、PLMNAMFhassentanindicationtowardstheUEduringtheRegistrationprocedurethatIMSvoiceoverPSsessionissupported,seeclause5.16.3.10inTS23.501[2]andtheUEhasregisteredintheIMS.IfN26isnotsupported,theservingPLMNAMFsendsanindicationtowardstheUEduringtheRegistrationprocedu

7、rethatinterworkingwithoutN26issupported,seeclause5.17.2.3.1inTS23.501[2].5©2018Nokia双注册模式双注册6©2018Nokia