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TrueMobile Broadband

Wireless City Planning

a Softbank company

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TrafficExplosion

20001993 ２００７

3G2G

1973

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x1K10 years

x325 years

x2/year

An inconvenient truth

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“Cloud” requires huge radio capacity

Let there be light

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Wemust survive

against Data Storm

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What do wehave to do?

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Reduce Interference

Smaller Cell

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Simple Smaller Cell

Poor fringe quality

BS1 BS2

BS3

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Smaller Cell +

nice Interference Cancel Technologies

BS1 BS2

BS3

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Next 10 to 15 Years

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LTE

All bandsGSM, UMTS

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Three different approaches toLTE

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1. GSM with limited WCDMA

2. Cdma / WiMAX

3. Well deployed UMTS

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Skip 3GSave 3G

Investment

GSM with limited WCDMA

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All in one chipare shipping

Single Eco-system

GSMUMTSLTE

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Shareexistingfacilities

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First application of LTE

Wireless DSLNomadic Data

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Smart PhoneSmart Phone

Gradually

Ready 2012

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1. GSM with limited WCDMA

2. Cdma / WiMAX

3. Well deployed UMTS

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Eco-system issue forcdma / WiMAX

Nationwide LTEmigration rapidly

with VoLTE

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1. GSM with limited WCDMA

2. Cdma / WiMAX

3. Well deployed UMTS

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deploy LTEfor capacity

Well deployedUMTS

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fortunately

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Concentrated Traffic

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70% > TRFgenerated at Indoor

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+4G+Wi-FiNation Wide

2/3G

2/3G

Urban/Suburban

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High Dense& Pinpoint

High Dense& Pinpoint

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High Dense& Pinpoint

High Dense& Pinpoint

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Also

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4G

All bandsGSM, UMTS

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Capacity

Coverage (Power)

Use Bands asa Cocktail

700-900MHz

1800/1900MHz

2100MHz

3500MHz 2600MHz

WiFi

MacroMacro

Micro

Pico

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CapacityToday each band (system) has various size of cell

Macro

Macro

Micro

Pico

2G900MHz

Coverage

Macro

Macro

Micro

Pico

Femto

3G2.1GHzInt

erfere

nce

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Capacity

Coverage (Power)

Dedicated Pico bandswould give us ahuge Capacity

700-900MHz

1800/1900MHz

2100MHz

3500MHz 2600MHz2300MHz

WiFi

MacroMacro

Micro

Pico

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so

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Offload2/3G2/3G

4G&

WiFi

4G&

WiFi

Traffic

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Is this enough?

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No!

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x1K10 years

x325 years

x2/year

An inconvenient True

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whatcould we do more

against Data Storm

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TDD

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TDD

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Mobile Internetfits better toTDD

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FDD = VoiceSymmetric

Internet fits better to TDD

Internet = TDDAsymmetric & Broadband

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GuardTime

<<10%

T

FDD TDD

UL

DLGB DLUL

T

F FN:1U:D=1:1

Guard Band >>10%

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5%

T

FDDB7

TDDB41

25%

70%26% 37%37%

T

F F190MHz190MHz

2x

2.5/2.6GHz

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Inter Bands Guard Band >>10%

F

T

FDD DLUL DLUL

T

F

TDDUL

DL=

UL

DL

UL

DL

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So, I would say…

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TDDis the hope

against Data Storm

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but

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People ask me…

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DoesTDD have a eco-system?

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Global TD-LTE Initiative (GTI) Since Feb 2011 in MWC

InitiatorsChina MobileBharti AirtelSoftbankVodafoneClearWire

32Operators

*Include several WiMAX operators.

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Over

600M

200M

200M33M

and more... Subscribers1Billion

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755MHz Bandwidth

TDD bandopportunities

3.7GHz 200MHz3.5GHz 200MHz2.6GHz 200MHz2.3GHz 100MHz1.9GHz 40MHz2.0GHz 15MHz

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TDD≒ FDDfor LTE

Single Eco-system

GSM

UMTS

LTE[F&T]

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Also

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People ask me…

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Has TDD been matured?

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Yes!It’s working Now!

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System Launchedin Nov.1st 2011

Major30+ Cities

Tokyo, Osaka, Nagoya…

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4G TDD

(20MHzBW)110Mbps110MbpsMax.

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CommercialDevice

Feb 2012

MiFi4G+3G

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20122012

NW Supports Smart Phone

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AcceleratingDeployments

2̃000eNB/Month

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Most of TRFCoverage

20132013

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Only One Small Concern is

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Launch beforeChina

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OurPotentials

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150BS/km2150BS/km2

160k Micro cell Sitesare available for 4G

160k Micro cell Sitesare available for 4G

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More antenna elements

More antenna elements

More speedMore speed

N MIMO : N elements

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Which one is easier to havemore antenna elements?

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Cloud RAN

BBU

Distributed RRH@sites

Cloud BBU @LXC office

Dark Fiber

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Cloud RAN

Which one is

much intelligent?

Distributed RAN

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Cloud RAN

Which one is

lower power consumption?

Distributed RAN

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Cloud RANw/pooling BBU

Which one is

more robust?

Distributed RAN

N+1

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Cloud RANThe best performance for Mobile BB

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but

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Dark Fiberdoes not exist everywhere!

with reasonable price

Except for Japan

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What could we dow/o centralized solution?

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TDD

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TDD

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Diversity of opinionIndependence

Decentralization Aggregation

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Null SteeringBeam Forming

We should know the Power of TDD’s FrequencyReciprocity

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Using reciprocityTDD => Autonomous

nice performance without Dark Fiber

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We would say

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True Mobile

Broadband

True Mobile

Broadband

We providesWe provides