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5G Voice (ZTE).pdf
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5G Voice (ZTE).pdf
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5G Voice
White Paper
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1
1
Introduction
2
5G Voice Standardization Completion
2.1 5G Voice Standard Progress
2.2 5G Voice Implementation Solutions
2.3 5G SMS/USSD Solution
3
Key Technologies of 5G Voice
3.1 5G Voice Continuity
3.1.1 EPS Fallback Voice Continuity
3.1.2 VoNR Voice Continuity
3.2 5G Voice Session Binding
3.3 Fast Return to 5G After EPS Fallback
3.4 Access Domain Selection/Terminating Access Domain Selection
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16
16
Table of
Contents
3.5 5G Voice Charging
3.6 5G Voice Emergency Call
3.7 5G Signaling Network Construction
3.8 5G Voice Roaming Maturity Analysis
4
Evolution Steps from VoLTE to 5G Voice
4.1 Voice and SMS Solution in the Early Phase of 5G Deployment
4.2 Voice and SMS Solution in the Middle/Later Phase of 5G Deployment
4.3 5GC-Oriented Evolution of IMS
5
VoLTE/VoNR Voice Quality Guarantee
6
ZTEIMS-based5GVoiceSolution
7
Summary
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3
2
In June, 2018,
as 3GPP announced that the standalone (SA)
standards have been frozen,
the standardization of 5G Core (5GC) is complete.
5G network commercialization has begun and the
world-wide mainstream operators are dedicated to
5G network construction.
The 5G era has come.
According to 5G deployment options,
5G voice solutions not only include the target
solution Voice over New Radio (VoNR) but also
middle-phase supplementary solutions such as EPS
Fallback, RAT Fallback,
VoLTE and 5G SRVCC (will be dened by 3GPP R16).
Introduction
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5
4
5G Voice
Standardization Completion
R14
R15
5G
R16
5G Voice
Standard Progress
As dened in 3GPP R15 standard, 5G will adopt 4G VoLTE voice architecture for 5G voice implementation and deliver voice
service based on IMS. The specic voice solution adopted by an operator depends on the actual 5G deployment mode and
wireless network deployment progress. 5G Non-Standalone (NSA) Option 3 relies on EPC and LTE network deployment and
3GPP R15 NSA standard has been frozen in the end of 2017. 5G SA Option 2 is a service-based, innovative, independent
construction scheme and 3GPP R16 SA standard has been frozen in June, 2018. 3GPP R16 will continue to apply the
advantages of service-based architecture to IMS and enhance IMS architecture and some interfaces for Internet of Things (IoT)
applications. In addition, it will provide support for interworking between 3G and 5G.
3GPP R15 standard has met the requirements for commercialization of 5G NSA/SA basic voice and SMS services. 3GPP
R16 studies on IMS enhancement requirements in the industrial application scenario, but does not focus on man-man
voice or SMS service.
Figure 2-1 Vo5G Standard Progress
2015 2016 2017 2018 2019 2020
IMT-2020 requirements
R14 R15 R16
SI Phase WI Phase 1
NSA SA
WI Phase 2
5G Evolution
IMT-2020 specIMT-2020 proposals
Basic Voice Service
Domain selection (MO call, MT call, SMS)
Interworking
(N26-based interworking, dual-registration)
Voice fallback (EPS Fallback, RAT Fallback)
SMS
IMS-based SMS (SMS over IP)
Control-plane-based SMS (SMS over NAS)
Emergency Call Service
Emergency registration
Emergency call fallback
IMS Enhancement
IMS network slice
SBA-based Cx and Sh interfaces
Npcf interface usage in IMS
IMS APP server deployment in local environment
Interoperability Enhancement
( 3G
coverage is better than 4G, and no VoLTE
)
5G SRVCC -direct interoperation between 5G and
3G: a 5G UE registers in the IMS, the UE falls back to
3G (CS voice) when a dedicated bearer is setup in
an originating or terminating call request
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