Introduction of 5G Phase 2 from Standard Perspective

Tao Sun

China Mobile Research Institute

3GPP SA2 Vice Chair

2

Outlines

5G Standard Still Progress with high load 1

What is R17 Looks Like 3

Some R16 Features you may Interest 2

3

3GPP Target 5G Phase 2 on 2020 March

5G Phase 1 (R15 SA) was completed on 2018. 6. 14. Mainly worked out the basic system functionalities, support eMBB and part of URLLC

5G Phase 2（R16）will be completed on March, 2020. Mainly focus on reliability, mMTC, as well as some vertical support features.

Release 15 Release 16

Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

2016 2017 2018

5G研究阶段 5G Rel-15 NR NSA ASN.1

5G Rel-15 SA ASN.1

5G Rel-16 Enhancement 5G Rel-16

Q1 Q2 Q3 Q4

2019

Q1

2020

R15 Late Drop

4

3GPP SA2 Statistics——Still Busy Work

0

50

100

150

200

250

300

88 89 90 91 92 93 94 95 96 97 98 99 100

101

102

103

104

105

106

107

108

109

110

111

112

113

113A

H11

411

511

611

6bis

117

118

118b

is11

912

012

112

212

2bis

123

124

125

126

127

127b

is12

812

8bis

129

129b

is13

013

113

213

313

4

SA WG2 meeting attendance

5

3GPP SA2 Statistics——Still Busy Work

SA2 meetings

Nu

mb

er

of

Se

ss

ion

s

5 6 6.5 6 3.4 5

3 4.5 3.8 4 4 1.5 1.2

3 1.5 0.9 0.9 2 0.9 3.5

18

23

27 31

32.5

36 37

24 25

19 19

15 15 13.7

11.5 9 9.3 8.2

7.2 6

2.5

8.5

11.5 8.3

6.3

4 3

3.7

13.5 12 19.5 20

26.4 28.6 31.2

34.9

34.9 34.4 35.3 37.7

33

1 1.3

1 0.2

0

10

20

30

40

50

60

#118bisJan

#119Feb

#121May

#122Jun

#122bisAug

#123Oct

#124Nov

#125Jan

#126Feb

#127Apr

#127bisMay

#128Jul

#128bisAug

#129Oct

#129bisNov

#130Jan

#131Feb

#132Apr

#133May

#134Jun

maintenance Rel-15 5GS / maintenance Rel-15 other Rel-16 work Rel-15 exceptions

6

Outlines

5G Standard Still Progress with high load 1

What is R17 Looks Like 3

Some R16 Features you may Interest 2

7

5G Phase 2 Features

No. SI/WI

1 Enhancing Topology of SMF and UPF in 5G Networks (ETSUN)

2 Enablers for Network Automation for 5G (eNA)

3 5GS Enhanced support of Vertical and LAN Services (Vertical_LAN)

4 Enhancement of URLLC supporting in 5GC (5G_URLLC)

5 Cellular IoT support and evolution for the 5G System (5G_CIoT)

6 Architecture enhancements for 3GPP support of advanced V2X services (eV2XARC)

7 Enhancements to the Service-Based 5G System Architecture (5G_eSBA)

8 Enhanced IMS to 5GC Integration (eIMS5G_SBA)

9 Access Traffic Steering, Switch and Splitting support in the 5G system architecture (ATSSS)

10 Wireless and Wireline Convergence for the 5G system architecture (5WWC)

11 Study on architecture aspects for using satellite access in 5G (FS_5GSAT_ARCH)

12 Optimisations on UE radio capability signalling (RACS)

13 Enhancement to the 5GC Location Services (5G_eLCS)

commercial deployment

big data/automation

vertical support

5GC enhancement

3GPP SA2 has 13 SI/WI in R16，focus on four aspects: commercial deployment, big

data/automation, vertical support, 5GC enhancement

8

1.1 NWDAF for Data Analytics and Data Collection

NEF NWDAF AF PCF

AMF SMF

UPF

Nnef Nnwd

af

Naf Npcf

Nam

f

Nsm

f

N4

UDR

Nudr

CHF

Nchf

OAM

Noa

m

RAN UE

Data Analytics Consumer (5GC NF/AF/OAM)

NWDAF

1. Nnwdaf_EventsSubscription_Subscribe/ Nnwdaf_EventsSubscription_Unsubscribe

2. Nnwdaf_EventsSubscription_Notify

Data Analytics Consumer (5GC NF/AF/OAM)

NWDAF

2. Nnw daf_AnalyticsInfo_Request

response

1. Nnw daf_AnalyticsInfo_Request

Two way to get AnalyticsInfo

Network Data Analytics Function (NWDAF) is introduced in R15 but its main feature is

developed in R16. The NWDAF includes the following functionality:

① Support data collection from

NFs and AFs;

② Support data collection from

OAM;

③ NWDAF service registration

and metadata exposure to

NFs/AFs;

④ Support analytics information

provisioning to NFs, AF.

9

NWDAF OAM

1. Subscribe

2. Configuration

4. Notification

3. Processing

OAM Data Type

Example

UE Data ‐ MDT Data, TS 37.320, RSRP/RSRQ/Power Headroom/Packet Delay/Received Signal Strength Indicator/Round Trip Time

‐ QoE Metric, TS 26.247, Average Throughput, Initial Playout Delay, Buffer Level, Play List, MPD Information, Playout Delay for Media Start-up, Device Information

RAN Data ‐ MDT Data, TS 37.320, Received Interference Power/Data Volume/Scheduled IP Throughput/Packet Loss rate

KPI Data ‐ Network KPI Data, TS 28.55x series, Performance measurements for gNB/Performance measurements for CN/End to end KPI

1.2 What Info can be Obtained by NWDAF

The NWDAF get information from OAM based on mechanisms such as Tracing, MDT and

QoE

• Global level (per area, slice level, NF

level) instead of UE/UE group level

information is obtained, i.e., UE

MDT/QoE Metric, RAN, and KPI data

10

2.1 3GPP System is the TSN“Logical Bridge”

TETransp.t

5G GM

gNBUEPTP-

compatible 5G transport TSN

Working

Domain

TSN

Bridge End

Station

TSN GMEnd

Station

UuDS-TT

5G system can be considered as an

802.1AS "time- aware system"

S

MMS S

M

5GS

5GS5GSTSe

5GSTSi

TSN

MS S M

TSNTSN

TSN

TSN

TSN

5G TimeDomain

: TSN timing direction

5GS

TSN

: 5GS time synchronization

: TSN time synchronization

UPF

NW-TT

• 5G system is modelled as IEEE 802.1AS compliant time aware system for

supporting TSN time synchronization

Periodic deterministic QoS, NW-TT/DS-TT上The features include the following: - providing TSC Assistance Information (TSCAI) that describe TSC flow traffic patterns at the gNB ingress and UE egress interfaces for traffic in downlink and uplink direction, respectively; - Support for hold & forward buffering mechanism in DS-TT and NW-TT to de-jitter flows that have traversed the 5G System.

Bridge B

Bridge A

TSN Bridge /

End Station

UE1

UPF - A NW-TT

DS_TT

TSN System

UPF - B NW-TT

TSN Bridge /

End Station

DS-TT UE2

DS-TT

11

2.2 Challenges of Deterministic Network Capability

• Only used for local area

• High requirement for terminal and network element

• UPF shall be synchronized with gNB as well as

other CP functions

• NIC need to support 1588

• Industry support still has gap

• Complicated CNC（TTTECH）

• Besides TSN, other Eathertype support still has

some obstacles

• Further development (China Mobile, NOKIA, Verizon）

• 5G native support deterministic features: 5G

System not a black box but a TSC system

• Extend from layer 2 to layer 3: 5G+DetNet

12

3.1 5GLAN：enable operator to provide LAN-type service

• Enable devices in localized network with most optimized communication path, i.e.,

local switch

• Support wide-area network coverage, device service continuity due to mobility, and

multiple service isolation in a 5GLAN;

• Super-easy user/UE configuration to join/leave LAN;

13

3.2 China Mobile Collaborate with Partners on 5G LAN

Vertical partner VPC1

UPF

SMF

UDM

5G Core

PCF NEF Terminals of VPC1

Vertical partner VPC2

OTT management UI

NR

AUSF NSSF

Terminals of VPC2

VPC: virtual private cloud

5G LAN helps to establish customized 5G network with flexibility and high-efficiency

5GC

5G

Baidu Cloud

8K Display

8K

14

4. eSBA Introduce SCP for Framework Enhancement

SCP

Legend:

Deployment unitDeployment unit

5GC

functionality A

Service

Agent

Service

Agent

Service Mesh

controller

5GC

functionality B

NRF

SBI SBI

Service Mesh

components

Non-SCP 5GC

functionality

Operator

policies

Internal service

registration/discovery

Nnrf

用户面功能

NSSF NEF NRF PCF UDM

AUSF AMF SMF

UE (R)AN UPF DN

• The Service Communication Proxy (SCP) includes one or more of the following functionalities

Indirect Communication Delegated Discovery Message forwarding and routing to destination NF/NF service. Communication security (e.g. authorization of the NF Service Consumer to

access the NF Service Producer API), load balancing, monitoring, overload control, etc.

15

5. ATSSS——Access Traffic Steering, Switch and Splitting support

• Introduce Multi-Access PDU Session

• UPF Support MPTCP Proxy

• The ATSSS rules are sent to UE with a NAS message

• UE and UPF Support link Quality measure

16

6. URLLC: Support for Ultra Reliable Low Latency Communication

UE

Master NG-RAN

Secondary NG-RAN

UPF2

AMF SMF1

DN

UPF1

N2

N3

N3

Namf Nsmf

N6

N6

N4 N4

Xn

SMF2

Nsmf

• End to end redundant User Plane paths using Dual Connectivity

UE NG-RAN UPF DN

AMF SMF

N3

N4

N11

N6

N2

N3 Tunnel 1

N3 Tunnel 2

PCFN7

UE NG-RAN UPF DN

AMF SMF

N3

N4

N11

N6

N2 N3 Tunnel 1

N3 Tunnel 2

PCFN7

I-UPF1

I-UPF2

N9

N9 Tunnel 1

N9 Tunnel 2

• Two N3 and N9 tunnels between NG-RAN and PSA UPF for redundant transmission

• Redundant transmission with two N3 tunnels

17

Outlines

5G Standard Still Progress with high load 1

What is R17 Looks Like 3

Some R16 Features you may Interest 2

18

Some 5G Features Candidate for R17

Study Items enh_EC enhancement of support for Edge Computing in 5GC

eNPN enhanced support of Non-Public Networks 5MBS Architectural enhancements for 5G multicast-broadcast services

eNA_Ph2 Enablers for Network Automation for 5G - phase 2

5G_ProSe System enhancement for Proximity based Services in 5GS D2D eNS_Ph2 Enhancement of Network Slicing Phase 2

5G_AIS 5G System Enhancement for Advanced Interactive Services IIoT Enhanced support of Industrial IoT - TSC/URLLC enhancements

MUSIM Support for Multi-USIM Devices 5GSAT_ARCH Integration of Satellite in 5G Systems

eV2XARC_Ph2 Architecture enhancements for 3GPP support of advanced V2X services - Phase 2

eATSSS Extended Access Traffic Steering, Switch and Splitting support in the 5G system architecture

UPCAS UPF enhancement for control and SBA eLCS_ph2 Enhancement to the 5GC LoCation Services-Phase 2

5GLAN_enh Enhancement of support for 5G LAN-type service ID-UAS Supporting Unmanned Aerial Systems Connectivity, Identification, and

Tracking 5WWC_enh Study on enhancement of support for 5WWC

MPS2 Multimedia Priority Service (MPS) Phase 2

Standard is the First Step. Implementation makes these Features Comes

True.