5G Vison and Research on Massive Mimo

Wu Xiang

Technology and Standards Research Institute,CAICT

2018-09

Evolution of Wireless Access Technologies

Outline

1 Scenarios of 5G

2 Research for 5G

3 Solid Step Toward 5G

5G- What Is the Industry Horizon

Amazingly Fast: Virtual Reality Office

Great Service in a Crowd:Stadium, Open Air Festival

Ubiquitous Things Communication:M2M

Best Experience Follows You:Ubiquitous MBB

Super Real -Time and Reliable Connection:Traffic Safety, Traffic Efficiency and Smart-Grid

Outline

1 Scenarios of 5G

2 Research for 5G-Improved MBB

-New Services Extension

3 Solid Step Toward 5G

Outline

1 Scenarios of 5G

2 Research for 5G-Improved MBB

-New Services Extension

3 Solid Step Toward 5G

Outline

1 Scenarios of 5G

2 Research for 5G-Improved MBB

-New Services Extension

3 Solid Step Toward 5G

MIMO: Key Technology to Increase Spectrum Efficiency

Tra

nsm

itter

Receiv

er

T2

T1

Tm

R2

R1

Rn

More capacity is possible

by Massive MIMO with spatial multiplexing

0

2

4

6

8

-4 -2 0 2 4 6 8 10 12 14 16 18 20 22 24

LTE实测 Shannon极限

SINR

Sp

ectr

um

eff

icie

ncy

LTE performance is close to Shannon Limit with given number of TRX

Shannon Limit

LTE test Shannon limit

Nt TX Nr RX

C = log2 (1 + PT / N0) bits/Hz/s C = min( nt, nr) log2 (1 + PT / N0)

Beamforming Made Possible with Massive MIMO

Horizontal Pattern of Different Number of Half Wavelength Dipole

0 -10 -20 -30 -40 -30 -20 -10 0 0 -10 -20 -30 -40 -30 -20 -10 00 -10 -20 -30 -40 -30 -20 -10 00 -10 -20 -30 -40 -30 -20 -10 0

1 dipole 2 dipoles separated by λ / 2 4 dipoles separated by λ / 2 8 dipoles separated by λ / 2Vertical Pattern of Different Number of Half Wavelength Dipole

0

-10

-20

-30

-40

-30

-20

-10

0

0

-10

-20

-30

-40

-30

-20

-10

0

0

-10

-20

-30

-40

-30

-20

-10

0

0

-10

-20

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-40

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-20

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0

8 d

ipo

les s

epara

ted b

y λ

/ 2

4 d

ipo

les s

epara

ted b

y λ

/ 2

2 d

ipo

les s

ep

ara

ted

by λ

/ 2

1 d

ipo

le

0 -10 -20 -30 -40 -30 -20 -10 00 -10 -20 -30 -40 -30 -20 -10 0 0 -10 -20 -30 -40 -30 -20 -10 0

8 dipoles separated by λ / 2

-41° phase shift

8 dipoles separated by λ / 2

0° phase shift

8 dipoles separated by λ / 2

60° phase shift

Horizontal Pattern of 1/2/4/8 Half Wavelength Dipole

Vertical Pattern of 1/2/4/8 Half Wavelength Dipole

Different Beam Direction with Phase Shift

BeamsDipole Dipole

Strengthen Point

Weaken Point

Beamforming

Massive MIMO Increase Spectrum Efficiency In Several Ways

2T2R

Massive MIMO64T64R

• Horizontal beamforming

• SINR gain

• Vertical beamforming

• SINR gain

• Multi-user beamforming

• Multiple streams

• Capacity gain

1

2

3

5G Massive MIMO Enhancement: Control Channels Support BF

LTE Broadcast beam is wide beam

eNodeB Baseband

T1

R1

TN

RN

Radio Front

Broadcast Beam

gNodeBBaseband

T1

R1

TN

RN

Radio Front

WideBeam

NR Broadcast beam isnarrow beam (sweeping)

PBCH/SS/PDCCH/PDSCH all support beamforming

CRSCell Specific Reference Signal

DMRSDemodulation Reference Signal

LTE 5G

~9dB

5G Massive MIMO Narrow Beam Design Enables 3D-Shaping

• Narrow beam by massive dipoles (64T/32T)

• Beamforming for BCH, SCH, CSI-RS to improve common

channel coverage

5G Narrow

Beamforming

LTE Wide Beam

××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××

64T64RHorizontal Beamforming Vertical Beamforming

• More precise beam & scanned area, more coverage gain

• Higher user SINR and Better interference control

All Channels Beamforming in 5G NR 3D Shaping Improves H+V Coverage

(Trainer information)

Trainer: Wu Xiang

E-mail: wuxiang@caict.ac.cn

Department: Institute 0f Technology and Standard Research

Address: No.52 Huayuan Bei Road, Haidian District, Beijing

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