3G, 4G & 5G Wireless Resources, Tutorials and FAQs - RWS … · 2019-07-30 · The NG-RAN...
Transcript of 3G, 4G & 5G Wireless Resources, Tutorials and FAQs - RWS … · 2019-07-30 · The NG-RAN...
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© 3GPP 2018 1
NR Architecture
Gino Masini3GPP RAN WG3 Chairman
Ericsson
RWS-180009
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Acknowledgments
My heartfelt thanks to:
Gao Yin (ZTE) 3GPP RAN WG3 Vice-Chair
Sasha Sirotkin (Intel) 3GPP RAN WG3 Vice-Chair
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TSG RANRadio Access Network
RAN WG1Radio Layer 1 spec
RAN WG2Radio Layer 2 spec
Radio Layer 3 RR spec
RAN WG3lub spec, lur spec, lu spec
UTRAN O&M requirements
RAN WG4Radio Performance
Protocol aspects
RAN WG5Mobile Terminal
Conformance Testing
RAN WG6GSM EDGE
Radio Access Network
TSG SAService & Systems Aspects
SA WG1Services
SA WG2Architecture
SA WG3Security
SA WG4Codec
SA WG5Telecom Management
SA WG6Mission-critical applications
TSG CTCore Network & Terminals
CT WG1MM/CC/SM (lu)
CT WG3Interworking with external
networks
CT WG4MAP/GTP/BCH/SS
CT WG6Smart Card Application Aspects
Project Coordination Group (PCG)
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Summary
What is NG-RAN?
Stand-Alone (SA) and Non-Stand-Alone (NSA)
gNB split architecture
The unified User Plane
gNB CP-UP split architecture
Conclusions
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What is NG-RAN?
The New RAN (Radio Access Network) for 5G
Provides both NR and E-UTRA (“LTE”) radio access
An NG-RAN node is either
gNB – (“5G base station”, providing NR access) or
ng-eNB (“enhanced 4G base station”, providing E-UTRA access)
NG-RAN nodes are connected:
To the 5G core network – NG interface
To one another – Xn interface
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The NG-RAN
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Deployment Options (1)
Both Stand-Alone (SA) and Non-Stand-Alone (NSA) deployments are possible
Maximum flexibility for operators
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Deployment Options (2)
Stand-Alone (SA): gNB connects to the 5G Core Network (5GC)Non-Stand-Alone (NSA): tight interoperation between gNBs and ng-eNBs
Connected to the same core network: eitherEPC, the existing LTE core network (NSA within “4G RAN”) or5GC, the 5G core network (NSA within NG-RAN)
Dual Connectivity (DC) toward the terminalA Master Node (MN) and a Secondary Node (SN) concurrently provide radio resources toward the user, for higher bit rateThe terminal “sees” a Master Cell Group (MCG) and a Secondary Cell Group (SCG)
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Architecture “Options”
Combinations of various alternatives for Master Node (MN), Secondary Node (SN), and core network types
(numbering is for reference only)
Different migration paths are possible according to operator strategy
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Option 3 (“EN-DC”)
eNB as MN, connected to LTE core network
“en-gNB” as SNOnly a subset of 5G radio functionality is needed for this use
MeNB
S-GW
en-gNB
S1
-U
X2-U
S1-U
MeNB
MME
en-gNB
S1
-MM
E
X2-C
Control Plane User Plane
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Option 4 (“NE-DC”)
gNB as MN, connected to 5G core network
ng-eNB as SN
MN
UPF
SN
NG
-U
Xn-U
NG-U
MN
AMF
SN
NG
-C
Xn-C
Control Plane User Plane
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Option 7 (“NGEN-DC”)
ng-eNB as MN, connected to 5G core network
gNB as SN
MN
UPF
SN
NG
-U
Xn-U
NG-U
MN
AMF
SN
NG
-C
Xn-C
Control Plane User Plane
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Other Available Options
Option 2: gNB connected to 5G core network (SA operation)
“NR-NR DC” is supported (gNBs as MN and SN)
Option 5: ng-eNB connected to 5G core network
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Migration Considerations (1)
Migration choice and path depends on:Operator strategy
Business decision on when to deploy the 5G core networkIntroduction of new distinctive 5G features (e.g. slicing)
Availability of new frequencies for NR
Existing network density
Increase of end-user traffic
Availability of terminals with the right feature set / bands
…
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Migration Considerations (2)
If initial NR deployments use higher frequencies (e.g. above 6 GHz):
Smaller coverage on NR than on LTEOpt. 3 uses LTE for coverage and NR for higher capacity in busy areas, leveraging existing investments
When 5G core network is deployed:Opts. 2 (SA) and 4 (NR for coverage, LTE as booster) use NR as basis for coverageOpts. 5 (ng-eNB for coverage) and 7 (ng-eNB for coverage, NR as booster) use LTE as basis for coverage
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gNB Split Architecture
gNB may be split into a central unit (gNB-CU) and one or more distributed units (gNB-DUs)
More deployment flexibility
Better support for e.g. low latency services
One gNB-CU may connect to multiple gNB-DUs
One gNB-DU may support one or more cells
5GC
NG NG
Xn-C
NG-RAN
gNB
gNB-DU gNB-DU
gNB-CU
gNB
F1 F1
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The Unified User Plane
The same user plane protocol is used for:
Xn-U (between NG-RAN nodes connected to 5GC)
X2-U between an eNB and an en-gNB for Option 3
F1-U (between gNB-CU and gNB-DU)
A single user plane instance may run all the way from the gNB-DU to another NG-RAN node
One “hop”, no intermediate terminations
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gNB CP-UP Split Architecture
gNB-CU may be split into its control plane and user plane parts (gNB-CU-CP and gNB-CU-UP)
More deployment flexibility
One gNB-CU-CP may connect to a single gNB-CU-UP
One gNB-DU may support one or more cells
E1
gNB-DU
gNB-CU-CP
F1-C F1-U
gNB
gNB-CU-UP
gNB-DU
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Conclusions
NR tightly interoperates with existing LTE networks
The NG-RAN interfaces and protocols specified by 3GPP facilitate the evolution of 4G to 5G and help the uptake of the 5G core network
Upcoming enhancements address new requirements beyond mobile broadband
e.g. automated driving, industrial automation, e-health services, etc.