5G 무선통신 표준화와 기술 - krnet.or.krB0%AD%C1%F6%BF%F8.pdf · -2 UEs, no specific inter device interference cancellation algorithm Smart scheduling/coordination algorithm

5G 무선통신 표준화와 주요 기술

2016.06.21

Jiwon Kang ([email protected])

Advanced Standard R&D Lab., LG Electronics, Inc.

mailto:[email protected]

1 Copyright 2016. LG Electronics Inc. All rights reserved.

Baseline 5G Standardization Roadmap

3GPP 5G Standardization

Ref) RWS-150073 3GPP RAN 5G W/S “RAN Chairman Summary”

5G Preparation 5G Phase-1 Standardization 5G Phase-2 Standardization


3GPP’s Phased Approach for 5G Standardization


2015 2016 2017 2018 2019 2020

3GPP Release

Timeline

Rel-13 Rel-14 Rel-15

5G Standardization

Start

5G Phase-1 Standardization

(Initial 5G)

Rel-16

5G Phase-2 Standardization

(5G Plus)

Demo/

Commercialization 5G Demo

(‘18.2, Pyoungchang)

Initial 5G

(‘20.1H)

5G Plus

(Mid. 2020s)

ITU-R IMT-2020

Submission

Initial submission IMT-2020 RIT

submission

(‘20.2)

Performance Requirements/

Evaluation method

Proposal

Evaluation

Spec.


New Gen. Access Techs.: Target Scenarios


Indoor Hotspot

Dense Urban

Rural

Urban Macro

High Speed

Extreme Rural for the Provision of

Minimal Services over Long Distance

Urban Coverage for Massive

Connection

Highway Scenario

Urban Grid for Connected Car

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eMBB mMTC URLLC <6GHz 6GHz


New Gen. Access Techs.: Target KPIs


Peak Data Rate

Peak Spectral Efficiency

Bandwidth

Control Plane Latency

User Plan Latency

Latency for Infrequent Small

Packets

Mobility Interruption Time

Inter-system Mobility

Reliability

Coverage

DL-20Gbps

UL-10Gbps

DL-30bps/Hz

UL-15bps/Hz

TBD

10ms

URLLC-0.5ms

eMBB-4ms

TBD

0ms

TBD

(1-10-5) within

1ms

TBD (MCL-

164dB)

UE Battery Life

UE Energy Efficiency

Cell/TRP Spectral Efficiency

Areal Traffic Capacity

User Experience Data Rate

5th Percentile User Spectral

Efficiency

Connection Density

Mobility

Network Energy Efficiency

15y (Details TBD)

Qualitative

TBD

3x IMT-

Advanced

TBD

TBD

106 devices/km2

(details TBD)

500km/h

Qualitative


New Gen. Access Techs.: Requirements


Tight interworking btw. New RAT and LTE

Support of connectivity through multi-TxPs

Flexible options for splitting the RAN architecture

Deployment flexibility e.g. to host relevant RAN, CN

and application functions at the edges of the network

C-plane/U-plane separation

Deployments using Network Function Virtualization

Independent evolution of the RAN and the CN

Operation of Network Slicing

Sharing of the RAN between multiple operators

Architecture & Migration Supplementary Serives

Multimedia Broadcast/Multicast Service

Location/Positioning Service –

1m accuracy (indoor/outdoor)

Public safety communications

Emergency communications

Public warning/emergency alert

Critical

Comm.

Service


Scalable Numerology

Application-/Spectrum-specific Scalable System Numerology Design

• Scalable subcarrier spacing

Working assumption in 3GPP: f0 x 2N (N= integer), f0 = 15kHz

• Variable TTI will be supported (e.g. 0.125ms, 0.25ms, 0.5ms, 1ms, etc.)

5G Enabling Radio Technologies

Numerology Case-1 (6GHz) Case-2 (6GHz) Case-3 (>6GHz)

Purpose Massive MTC URLLC, eMBB1) eMBB1)

Subcarrier Spacing <15 kHz 15~60kHz 60 kHz

CP size > 10s 1~10s <1s

TTI 1ms ≤ 1ms ≤ 0.25ms

System BW Scalable BW

1) Enhanced Mobile BroadBand


DL/UL Self-contained Timeframe

Basic Concept

Main Motivation

• High probability of unpaired spectrum allocation for newly defined 5G IMT band in WRC-15 and -19

• Mainly supporting low latency operation and fast channel information acquisition

Research Topics

• New UE procedure design for HARQ , link adaptation, and data/control transmission & reception

• New control signaling mechanism

• New physical signal/channel design


Single time frame with a TTI length = {DL dedicated resource, UL dedicated resource, DL or UL data

resource, Guard period}

•DL dedicated resource: DL control channel, DL reference signal, DL synchronization signal (possibly)

•UL dedicated resource: UL control channel, UL reference signal, UL synchronization signal

DL control,

DL RS DL or UL data

UL control,

UL RS

G

P

G

P


Waveform

Main Motivation of Filtered Multi-carrier

• Support of Low OOB emission requirement in fragmented spectrum or guard band operation

• Orthogonal reception of asynchronous signals, i.e. fast uplink access

New Waveform Candidates

• OFDM variants

FCP-OFDM (Flexible CP-OFDM): Flexible filter length + Flexible CP length

Filtered OFDM(f-OFDM): Filter + Fixed CP

Universal filtered OFDM (UF-OFDM): Filter + Zero padding

Windowed OFDM(W-OFDM): Time-domain windowing

• Others: Filter Banked Multi-carrier (FBMC), etc.


1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8

x 106

-70

-60

-50

-40

-30

-20

-10

Frequency [Hz]

PS

D [

dB

]

FCP-OFDM(L=1, CP=36) (=CP-OFDM)

FCP-OFDM(L=5, CP=32)




UF-OFDM(L=37,CP=0)


Advanced Multiple Access (1/2)

Main Motivation

• User capacity increase (or massive connectivity) & asynchronous contention-based uplink access

NR Candidate schemes


1) Non-orthogonal Coded Multiple Access

NCMA1) (LGE)

Non-orthogonality

Minimize multi-user interference (Coding/Modulation/Spreading/Time-Freq. Resource/Power Domain)


Advanced Multiple Access (2/2)

NR Candidate schemes (cont.)


RSMA3) (Qualcomm)

1) Sparse Coded Multiple Access 2) Pattern Division Multiple Access 3) Resource Spread Multiple Access

3GPP2 Multi-carrier CDMA scheme

SCMA1) (Huawei) PDMA2) (CATT)

Enhanced MUST Enhancement of 4G LTE-A Multi-User Superposition Transmission(MUST)

Ref) RWS-150003 CATT, RWS-150006 Huawei

Others Multi-user shared access(MUSA), Low rate code MA, Interleave-Grid MA(IGMA), etc.


Channel Coding

Main Motivation

• Implementation & processing cost/complexity to support Giga bps data rate

• Requirement of much lower error-flow feature below 10-4 or 10-5 to realize ultra reliable & low latency radio transmission

Potential Channel Coding Candidates

• LDPC, Polar coding, (Advanced) Turbo coding, Concatenated(outer) coding, …

Design Requirement

• Full support of adaptive modulation and coding rate

• Full support of various information block sizes

• Full support of incremental redundancy HARQ

• Sustainable cost/complexity in decoder processing & implementation

• FFS: Support of 3GPP rate matching mechanism



mmWave Transmission (1/2)


• Large path loss

• Poor radio propagation in NLoS link

• Large deviation and fast variation of shadowing effect

due to human body/scatterer blockage

• Increase in Doppler shift/spread

• Capacity enhancement through wider contiguous

radio bandwidth

• Dense placement of large-scale antennas, i.e.

ultra high beamforming gain vs.

White space: PL > 200dB

70m

200m

2GHz

Indoor

30GHz

Indoor

Larger

PL

Larger Shadowing

Deviation

Motivation Technical Challenges


mmWave Transmission (2/2)


Frame Structure Example for 27-33GHz

Design Requirements (Tentative) System Numerology (Exemplary)

Parameter Value

Cell radius ≤ 1km

Operation frequency 27GHz ~ 33GHz

CP overhead ≤ 7%

Transmission BW 80MHz x N (N 1 carriers)

Parameter mmWave

Subcarrier-spacing 60kHz

OFDM symbol period 16.67us

Guard Interval/Cyclic Prefix 1.17us2)

OFDM symbol duration 17.84us

CP overhead 6.7%

Occupied BW 72MHz

Guard-band 8MHz

Total System BW 80MHz

No. of available subcarriers 1200

Number of OFDM symbol

per TTI 14 symbols 7 symbols

TTI duration 0.25ms 0.125ms

#0 #1 #2 #3 #39#38

One radio frame, Tf = 10 ms

One subframe, Tsf = 30720Ts = 0.25 ms # 0 # 1 # 2 # 3 # 4 # 13

One TTI = 0.25ms

…

1.3us

(160 samples)

1.2us

(144 samples)


Massive MIMO

• Limitation of maximum number of TXRUs2) due to front-haul capacity

Examples of required front-haul capacity[1]: 2.45Gbps (4TXRUs, 10MHz BW) vs. 196Gbps (32TXRUs, 100MHz BW)

• Beamforming to support various UE mobility

Narrow beamforming based operation may not be feasible for high/mid mobility users.

• Optimal MIMO transmission for the increased number of UE antennas

Sufficient space for antennas (e.g. vehicles)

Higher frequency applications


High mobility UE

Massive MIMO RRH4) w/

small number of TXRUs

Low mobility UE

BBU3)

Motivation

Technical Challenges

• Key SE1) enhancement technology to achieve the 5G system capacity and radio quality requirements

[1] SK Telecom, “Massive MIMO Technical Trend and Standardization”, IEEK Workshop, August 2015

1) Spectral Efficiency 2) Transmit Radio Units 3) Baseband Unit 4) Remote Radio Head

http://www.google.co.kr/url?url=http://www.clker.com/clipart-68826.html&rct=j&frm=1&q=&esrc=s&sa=U&ei=DdROVdnVKKezmAW12oGwDg&ved=0CCEQ9QEwBg&sig2=1SBMutTjl_8C7zcnY_eS4A&usg=AFQjCNE2cKmO3KXlOxIBLveTZlmJM3rdcg


Flexible/Full Duplex (1/3)


• Service-specific & time-variant DL/UL data traffic asymmetry

Wide range of DL/UL traffic ratios (9:1 [1]) due to online video streaming, web browsing, file downloading,

etc.

• A demand of enhanced spectrum utilization efficiency

• Resolution of half-duplex restriction for unpaired spectrum utilization cases

Motivation

UE-specific TDD

DL

UL DL

Time

Cell #1

DL

UL

Time

Cell #2 UE #1 UE #2

UL DL

Time

UL DL

Time

DL, UL

Time

UE #1,2

Flexible FDD Full Duplex Radio

[1] RP-140419, NTT DoCoMo et al.




Core Tech #1: In-device Self Interference Cancellation

Device

#B

Device

#A

• Adaptive estimation capability for time-varying self-interference channel

• Effective cancellation algorithm for non-linearly distorted self-interference

• Full synergic support for other SE2) enhancement technologies, e.g. MIMO

23

-98

+ NF

Max. Cancellation

Target (121dB)

Noise floor @40MHz

Rx Power (dBm)

Digital SIC

50~60dB

Antenna SIC1)

+

Analog SIC

60~70dB

Self Interference

Cancellation


1) Self Interference Cancellation 2) Spectral Efficiency

Max. self interference




Core Tech #2: Inter-device Interference Cancellation

• Accurate and cost-effective inter-device interference estimation

• Interference aware link adaptation mechanism

• Full duplex optimized resource/device coordination and dynamic scheduling


1) Full Duplex 2) Half Duplex

Inter UE interference

UE #A UE #B

eNB #A eNB #B

Inter eNB interference

Ref) Internal simulation results

Contour Map for Sum-rate Ratio of FD1) over HD2)

- 2 UEs, no specific inter device interference cancellation algorithm

Smart scheduling/coordination algorithm & enhanced IC receiver are required to achieve the target system performance.


5G Connected Car (1/2)


• A car should be connected with other cars, hand-held devices, and infrastructure for road safety,

convenience, and infotainment

• Standardization for LTE-based V2X is ongoing in 3GPP to enable V2X (vehicle-to-everything) services.

V2V (Vehicle-to-Vehicle), V2P (Vehicle-to-Pedestrian), V2I/N (Vehicle-to-Infrastructure/Network)

• Enhancements should continue for 5G connected car.

• Vehicles have more rooms for advanced technology.

Less battery limitation, more processing power, more antennas, more predictability

Low latency &

high reliability

High data rate

Rel-14

V2X

5G

connected

car

Mission critical for

platooning, self-driving

High rate in-vehicle infotainment

Motivation

V2V

V2P

V2I

Pedestrian

Vehicle

Vehicle

Network


5G Connected Car (2/2)


• Support of high vehicle mobility

Handling high Doppler issue especially when D2D with the “dual mobility nature” is in a high frequency band.

Efficient communication under frequent handover

• Support of low latency and high reliability

Key requirement for safety services

• Support of high vehicle density

Evaluations in 3GPP is considering up to 175 vehicles per cell in the scenario of congestion in urban case


• Full duplex radio for D2D

• Vehicle multi-antenna transmission

• Mobility-aware transmission

• Enhanced mobility management

• Low latency and ultra reliable radio design

Enabling Technology Candidates


Thank You!

Q&A

Documents

5G 무선통신 표준화와 기술 - krnet.or.krB0%AD%C1%F6%BF%F8.pdf · -2 UEs, no specific inter device interference cancellation algorithm Smart scheduling/coordination algorithm