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NTT DOCOMO's Views on 5G Toward 2020 and Beyond

Takehiro Nakamura NTT DOCOMO, INC.

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5G Trends and Requirements

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Network/Communication Society in 2020 and Beyond

Everything Connected by Wireless

Extension/enrichment of wireless services

Deliver rich contents in real-time & ensure safety Monitor/collect information & control devices

Multiple personal devices

Interaction across multiple devices

Transportation (Car/Bus/Train)

Consumer electronics

Watch/jewelry/cloths

House Sensors Cloud computing

Video streaming New types of terminal/HI

Healthcare Education

Safety and lifeline system

Smart power grid Agriculture and farming Factory automation Weather/Environment

Remote operation using personal terminal

Entertainment, Navigation Traffic information

All kinds of services supported by the mobile personal cloud

Remote control of facilities House security

4K/8K video resolutions Video on newspapers Background video

4K

Glasses/Touch internet

Human interface and healtchcare sensors

Remote health check & counseling

Distance (remote) learning Any lesson anywhere/anytime

Prevention of accidents Robustness to disasters

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5G Requirements

Higher data rate Reduced Latency

Massive device connectivity

Energy saving & cost reduction

100x typical data rate (Even for high mobility)

100x connected devices (Even in crowded areas)

Energy saving for NW & terminals Reduced NW cost incl. backhaul

Higher system capacity

RAN latency : < 1ms

1000x capacity/km2

5G

5G radio access will provide a total solution to satisfy wider range of requirements for 2020 and beyond

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5G Definition and New RAT

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Evolution Paths for 5G P

erfo

rman

ce

~2015

Rel-10/11 Rel-8/9

Pico/Femto

LTE

LTE-Advanced Rel-12/13

Potential New RAT

~2020 Year

5G Radio Access

Rel-14/15,

Further LTE enhancements

Small cell & general cellular enhancements for beyond Release 12

Potential new RAT Should prioritize the achievement of more

big gains over backward compatibility Consider new spectrum allocations of

WRC-15 and beyond

Macro-assisted small cell enhancement

(Phantom cell)

CA/eICIC/CoMP for HetNet WRC-15

Further LTE enhancement

WRC-18

Big gain

Continuous evolution

5G = LTE enh. + New RAT

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Combined usage of lower and higher frequency bands Higher frequency bands become useful and beneficial!

Views on 5G Radio Access

5G technical concept Further cellular enhancements

Exploitation of higher frequency bands

Enhanced LTE RAT New RAT (Capacity carrier)

Frequency

Tight interworking (Dual connectivity)

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Why New RAT is Needed?

New RAT should achieve Significant Gains to justify 5G

Question - LTE enhancement cannot achieve these gains? Major change is really needed to achieve above gains?

5G 100x typical data rate (Even for high mobility) 100x connected devices (Even in crowded areas)

Energy saving for NW & terminals Reduced NW cost incl. backhaul

RAN latency : < 1ms

1000x capacity/km2 Video streaming 4K

New types of terminal/HI

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Keys to Motivate New RAT

Only network densification, i.e., small cell, is not sufficient to realize the 5G requirements

New RAT is needed to exploit: Wider bandwidth in higher frequency bands (e.g., > 10GHz) Enhanced spectrum efficiency via massive MIMO

technology

Spectrum extension

Network densification

Spectrumefficiency

100x data rate Gbps-order typical rate (~10Gbps peak rate)

1000x densification is not realistic

1000x capacity/km2

Data rate = spectrum efficiency x bandwidth

Required several 100MHz ~ GHz-order bandwidth

Typically less than 10bps/Hz

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New RAT Characteristics (1) Numerology to exploit higher frequency & wider bandwidth

Wider subcarrier spacing, i.e., higher symbol rate, desired for: Robustness against phase noise Avoidance of complex carrier aggregation using too many component

carriers

Shorter TTI for low latency (< 1ms) Consider scalability from LTE numerology

Low complexity implementation for LTE/new RAT dual-mode terminals Easy support of dual connectivity between LTE and new RAT

Frequency LTE

New RAT Wider bandwidth with

wider subcarrier spacing

Non-backward compatible to LTE

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New RAT Characteristics (2) Flexibility to support variable scenarios (D2D, wireless backhaul, multi-hop, etc.) RAT design considering DL/UL symmetry

Signal waveform: OFDM as baseline for up to 30GHz

High affinity with MIMO technologies in multi-path fading environments Alternative multi-carrier waveforms such as FBMC also can be considered

Single carrier waveform for further higher frequencies To prioritize the coverage

Waveform & bandwidth may depend on applied frequency bands Frequency bands

Frequency

e.g. < 10GHz e.g. 10-30GHz e.g. > 30GHz

Bandwidth

Single carrier OFDM (new numerology)

e.g. < 100MHz e.g. 100-1000MHz e.g. >1000MHz

LTE based Waveform

(or advanced multi-carrier waveforms)

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Capability of eLTE RAT Enhanced LTE (eLTE) RAT Capabilities Backward compatibility

Support all LTE capabilities, i.e., coverage, mobility, broadcast services, etc.

Tight-interworking capability with New RAT e.g. for Massive MIMO + Phantom Cell

Continuous enhancement with new functionalities Non-orthogonal multiple access (NOMA)

Further improvement of spectrum efficiency with enhanced receiver capability Support of M2M massive connectivity

eLTE with NOMA will be a good technology for massive connectivity etc.

New RAT

eLTE LTE

Tight interworking

NOMA

f,, code

Intentional Non-Orthogonality

f,, code

FDMA, TDMA, CDMA, OFDMA

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Deployment/Migration Scenarios In 2020, new RAT will be launched initially from areas, where higher

performance is required, e.g. dense urban area, using higher frequency bands

Enhanced LTE (eLTE) RAT is also introduced to realize tight interworking with new RAT

In beyond 2020, deployment areas of new RAT and eLTE RAT are gradually expanded while introducing additional higher frequency bands

LTE (or LTE-Advanced) cell can be continuously used as eLTE cell for a long-time

LTE LTE LTE LTE Before 2020

2020 eLTE LTE LTE LTE New RAT

202x eLTE eLTE eLTE eLTE

New RAT

Urban Area Suburban/rural Area

Freq

uenc

y

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Google

Small Cell Small Cell

Small Cell

Small Cell

User data

Macro Cell

Control and User data

Proposed combination of Massive MIMO and Phantom cell will satisfy 5G requirements such as 1000x capacity

5G Deployments in Dense Urban

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Small Cell

Control and User data User data

(Semi-macro Cell)

Small Cell (Semi-macro Cell)

Small Cell (Semi-macro Cell)

Macro Cell

5G Deployments in Light Urban Proposed combination will provide adequate system

coverage even with higher frequency bands

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