progress report of ntt docomo lte trials - atis conference-ntt docomo lte trial… · title:...

January 26, 2009 Takehiro Nakamura 1Copyright© 2008 NTT DOCOMO, Inc. All rights reserved

ATIS-3GPP LTE Conference

Progress Report ofProgress Report ofNTT DOCOMO LTE TrialsNTT DOCOMO LTE Trials

January 26, 2009January 26, 2009TakehiroTakehiro NakamuraNakamura

NTT DOCOMONTT DOCOMO

Copyright© 2008 NTT DOCOMO, INC. All rights reservedTakehiro NakamuraJanuary 26, 2009 2

LTE History andLTE History and Status in 3GPPStatus in 3GPP

Q1 Q2

2004

Q3 Q4

2005

Q1 Q2 Q3 Q4

2006

Q1 Q2 Q3 Q4

2007

Q1 Q2 Q3 Q4

2008

Q1 Q2 Q3 Q4

Study Item

Work ItemTSG meetings

June 2006• The detailed

specification work (Work Item) started.

3

Q4

Sep-Dec. 2007• Major specifications were

approved.

Concept of Super 3G was proposed.

Concept of Super 3G was proposed.

DOCOMO started development of LTE (Super 3G) system

DOCOMO started development of LTE (Super 3G) system

Dec. 2004• Study Item on Evolved UTRA

and UTRAN was proposed by 26 companies and approved. • Test specifications were

approved.• Work Items were closed

Sep-Dec. 2007• Major core specifications

were approved.

•All LTE specifications have beenapproved.•Rapid progress in development by vendors is creating market momentum.

•All LTE specifications have beenapproved.•Rapid progress in development by vendors is creating market momentum.


Overall LTE Time Plan of NTT Overall LTE Time Plan of NTT DOCOMODOCOMO

2006 2007 2008 2009 2010

▲▲Core spec

Experimental System

▲RFP

3GPP Standardisation

development

▲Test spec

Commercial System Development

System Development

Indoor/FieldExperiments & Demo

2006 2007 2008 2009 2010

CommercialDeployment

Target date of development

completion: By the end of 2009

•DOCOMO started development of LTE system in 2006.•DOCOMO began LTE trials and demo from July 2007.

WI phaseSI

Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 4

NTT DOCOMO NTT DOCOMO LTE TrialsLTE Trials


LTE Experiment SystemLTE Experiment System

Servers(FTP, Streaming, SIP)

Core NetworkSimulator

Base Station

Base StationMobile Station

Mobile Station

Radio Propagation Channels

VoIP

VoIP

Interactivegame

Interactivegame

Multimedia Broadcast(MBMS)

FTP Client

high quality video conference

high quality video conference

high information rate, high quality video transmission


Major Parameters of the LTE Major Parameters of the LTE experimental systemexperimental system

Bandwidth 5, 10, 20MHzDL OFDMA

Access schemeUL SC-FDMA

Sub-carrier spacing 15kHzGuard interval (CP length) 4.7usecSub-frame length 1msec

Multi-Antenna technique for DL 1x2, 2x2 MIMO, 4x4 MIMO

DL ~ 300 MbpsUL

Duplex FDD

DL QPSK, 16QAM, 64QAMModulation

UL

~ 50 MbpsPeak data rate

QPSK, 16QAM

Aligned with 3GPP LTE specifications


NTT DOCOMO Field ExperimentsNTT DOCOMO Field ExperimentsField experiments have been conducted in 3 cities in Japan to confirm LTE practical performance in variety of environments

Yokosuka, Kanagawa• Started in February, 2008• 2 sites, 2sectors/site• Rural environmentKofu, Yamanashi

• Started in August, 2008• 2 sites, 6 sectors/site• Suburban environment

Sapporo, Hokkaido• Started in October, 2008• A single site, 2 sectors• Urban environment


Field Trial in Field Trial in YokosukaYokosuka

Sector 1

NTT DOCOMOR&D center

Sector 2

500m

250m

BS1BS2

Measurement course

4 Tx/ 2Rx2 sectors

BS#1(DoCoMo R&D Centre)

Sector 1

Sector 2

500m


Downlink Peak Throughput Downlink Peak Throughput in The Field Trialin The Field Trial

Peak throughput about 250Mbps is achieved !!!


HighHigh--Definition Video StreamingDefinition Video Streaming・6 High-definition video streaming・Total throughput of around 80 Mbps


Round Trip DelayRound Trip DelayCN

simulatorServer

eNode BUE

Ping


Bidirectional HD Video and Bidirectional HD Video and GamingGaming

CN simulator

eNode B UE

Bi-directionalHD video

GamingGaming

HD video shows gaming in the experimental car

Gaming at the BS side

HD video camera at BS side

Bi-directionalHD video

http://images.google.co.jp/imgres?imgurl=http://www.murauchi.com/MCJ/front/images/commodity/218/4943765001218.jpg&imgrefurl=http://game.murauchi.be/sale/2005/02/index.php&h=240&w=320&sz=8&hl=ja&start=2&tbnid=5e4FAf7Y0x3OKM:&tbnh=89&tbnw=118&prev=/images%3Fq%3D%25E3%2582%25B3%25E3%2583%25B3%25E3%2583%2588%25E3%2583%25AD%25E3%2583%25BC%25E3%2583%25A9%25E3%2583%25BC%25E3%2580%2580%25E3%2583%258F%25E3%2583%25B3%25E3%2583%2589%25E3%2583%25AB%26svnum%3D10%26hl%3Dja%26rls%3DGGLJ,GGLJ:2006-49,GGLJ:ja

http://images.google.co.jp/imgres?imgurl=http://www.murauchi.com/MCJ/front/images/commodity/218/4943765001218.jpg&imgrefurl=http://game.murauchi.be/sale/2005/02/index.php&h=240&w=320&sz=8&hl=ja&start=2&tbnid=5e4FAf7Y0x3OKM:&tbnh=89&tbnw=118&prev=/images%3Fq%3D%25E3%2582%25B3%25E3%2583%25B3%25E3%2583%2588%25E3%2583%25AD%25E3%2583%25BC%25E3%2583%25A9%25E3%2583%25BC%25E3%2580%2580%25E3%2583%258F%25E3%2583%25B3%25E3%2583%2589%25E3%2583%25AB%26svnum%3D10%26hl%3Dja%26rls%3DGGLJ,GGLJ:2006-49,GGLJ:ja


InterInter--eNodeBeNodeB HandoverHandover

Sector 1

DOCOMOR&D Centre

Sector 2

500m

250mBS#1

BS#2

Cell-IDVideo streaming(12 Mbps×2)

Delay profile

HO point(BS#1 BS#2)

Stable and loss-less HOwas achieved


Throughput distribution at the Throughput distribution at the measurement course in measurement course in YokosukaYokosuka

300

250

275

(Mbp

225

200

175

150

100

125

75

50

25BS1


Measurement Course in Measurement Course in YokosukaYokosuka

Measurement courseDistance from eNB antenna: app. 400~700 mRadio propagation env.: NLOS

eNB antenna height: app. 40 mUE antenna height: app. 3.2 mMobility speed: ave.30 km/h

DOCOMOR&D center

500m250m

eNB

a b

c

8090

100110120

0 1 2 3 4 5 6 7

Rec

eive

d po

wer

(dBµV

)

Delay (µsec)

8090

100110120

0 1 2 3 4 5 6 7

Rec

eive

d po

wer

(dBµV

)

Delay (µsec)

8090

100110120

0 1 2 3 4 5 6 7

Rec

eive

d po

wer

(dBµV

)

Delay (µsec)

Point a

Point b

Point c


DL Throughput DL Throughput FructuationsFructuations

050

100150200250

0 20 40 60 80 100 120 140Thro

ughp

ut (M

bps)

Time (sec)

Point a Point b Point c

05

1015202530

0 20 40 60 80 100 120 140Mea

sure

d re

ceiv

edSI

NR

per

ant

enna

(dB

)

Time (sec)

Throughput fluctuations depend on SINR fluctuationsAt point a (400 m from eNB antenna), more than 200 Mbps achievedAt point b, throughput degrades due to low SINR


Cumulative distribution of DL Cumulative distribution of DL Throughputs in test courseThroughputs in test course

0

0.2

0.4

0.6

0.8

1

0 50 100 150 200 250 300

CD

F

Throughput (Mbps)

Peak data rate exceed 250Mbps

More than 100Mbps is achieved over 90% area in measured course

More than 150Mbps is achieved around 50% area in measured course


DL Throughput PerformanceDL Throughput Performance

0

50

100

150

200

250

-5 0 5 10 15 20 25 30

Thro

ughp

ut (M

bps)

Measured received SINR per antenna (dB)

Field trial results are worse than those of lab test by several dB due to antenna correlation4x4 MIMO outperform 2x2 MIMO or SIMO significantly2x2 MIMO outperform SIMO under high SINR environment

SIMO2x2 MIMO4x4 MIMO

Lab.Field

NRB = 88


More Detailed Results of LTE TrialsMore Detailed Results of LTE Trials

Y. Ofuji, et al., “Experimental Results of E-UTRA Downlink with Variable RB Allocation,” IEEE VTC 2008-Fall, Sep. 2008.N. Okubo, et al., “Experimental Results of E-UTRA Uplink with Variable RB Allocation,” IEEE VTC 2008-Fall, Sep. 2008.Y. Ofuji, et al., “Experimental results on 4x4 MIMO precoding in E-UTRA, ” The 14th Asia-Pacific Conference on Communications (APCC) 2008, Oct. 2008.Y. Ofuji, et al., “Field Experimental Results of E-UTRA Downlink with Precoding and Non-Precoding MIMO, ” IEEE VTC 2009-spring, to be submitted.H. Takahashi, et al., “Field Experimental Results on E-UTRA Downlink Throughput Using Polarization Diversity Antennas, ” IEEE VTC 2009-spring, to be submitted.


NTT DOCOMO NTT DOCOMO LTE DeploymentLTE Deployment


Status toward LTE introduction in Status toward LTE introduction in JapanJapan

Introduction of 3.9G mobile communications system has been studied in telecommunications council in Japan since April 2008

In the council, LTE was proposed as one of 3.9G system to be studiedAs the study results, feasibility of LTE was confirmed in terms of meeting requirements of 3.9G and co-existence with existing radio systemsFour cellular operators in Japan, including DOCOMO, declared to introduce LTE as the 3.9G system within several yearsNTT DOCOMO declared to launch LTE in 2010 as one of the leading companies of LTE in the world


Overall LTE Time Plan of DOCOMOOverall LTE Time Plan of DOCOMO((Assumption with current 3GPP work plan)Assumption with current 3GPP work plan)

2006 2007 2008 2009 2010

▲▲Core spec approval

Experimental System

▲RFP

3GPP Standardisation

development

▲Core spec freezing

Commercial System Development

System Development

Indoor/FieldExperiments & Demo

2006 2007 2008 2009 2010

DoCoMo aims to complete the technology development before the end of 2009.

CommercialDeployment

Target date of development

completion: By the end of 2009

DOCOMO aims to complete the technology development before the end of 2009.To ensure the roaming/interoperability, we will watch the global status carefully and make a concrete plan.

WI phaseSI


DOCOMODOCOMO’’ss Views on LTE Spectrum Views on LTE Spectrum Deployment ScenariosDeployment Scenarios

At the LTE launch,2GHz spectrum band will be used because of the global spectrum band and utilization of existing NW facilities, e.g. antenna

LTE spectrum can be increased in the future according to wide spread of LTE terminals and new spectrum band allocation

Spectrum examples

2001 2010s 2020s

LTE

3G

PDC

Efficient use of 3G spectrum over long time

3G s

pect

rum

2G s

pect

rum


DOCOMODOCOMO’’ss Views on LTE System Views on LTE System Deployment ScenariosDeployment Scenarios

At the initial stage of LTE,Overlaid with 3G coverage3G and LTE dual mode terminalFocus on PS services

CS services can be provided in the 3G cellsReuse of existing BS site for low cost deployment

According to the wide-spread of the LTE terminals,LTE coverage will be expandedCS services can be provided in LTE on PS domain

2001 2010s 2020s

PDC3G

LTE

4GPSPSservicesservices

CSCS&PS&PSservicesservices

CS&PS servicesCS&PS servicesover packet NWover packet NW

Simple NWfor all services

3G terminalLTE terminal

LTE/4Gterminal

LTE/4Gterminal

Noaccess

2GUE

3G(HSPA)

(R99)


Core Network EvolutionCore Network EvolutionCore Network will also evolve toward ALL-IP in parallel with RAN’s evolution.

IPIP--based CSbased CSCS services

offered via IMSInterworking among

3G, LTE and 4G

LTELTE/4G support/4G support

ATMATM IPIP IPIP

IP-RNC

MSC

RNC

GGSNIMSGMSC

IPIP

IP-RNC

GGSNIMS

MME/S-GWSGSN

P-GW

SGSN

GGSN

IP-RNC

SGSNCS-GW

IP-BTS eNB 4G NodeB

CS-GW

IP-BTSBTS

IP-basedRAN

IP-BTS


ConclusionsConclusions

LTE TrialsNTT DOCOMO conducted LTE indoor and field trials from July 2007 and February 2008, respectively.Field trials are conducted in 3 cities in Japan to confirm practical LTE performance under variety of environmentThe trial results shows satisfying high performance of LTE in terms of delay, throughput and stability

NTT DOCOMO’s views on LTE deploymentNTT DOCOMO will launch LTE in 2010 as one of the leading companies of LTE in the worldLTE service area will be overlaid with 3G service area and LTE/3G dual mode terminal will be introduced in order to deploy seamless service area from the beginning of LTE launch2 GHz spectrum band will be used for LTE launch considering utilization of existing NW facilities and global roamingLTE spectrum can be increased in the future according to wide spread of LTE terminals and new spectrum band allocation

progress report of ntt docomo lte trials - atis conference-ntt docomo lte trial… · title:...

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