Progress Report of NTT DOCOMO LTE Trials - ATIS conference-NTT DOCOMO LTE...existence with existing...
Transcript of Progress Report of NTT DOCOMO LTE Trials - ATIS conference-NTT DOCOMO LTE...existence with existing...
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.
Copyright© 2008 NTT DOCOMO, INC. All rights reservedTakehiro NakamuraJanuary 26, 2009 3
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 5
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 6
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 7
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
Copyright© 2008 NTT DOCOMO, INC. All rights reservedTakehiro NakamuraJanuary 26, 2009 8
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 9
Downlink Peak Throughput Downlink Peak Throughput in The Field Trialin The Field Trial
Peak throughput about 250Mbps is achieved !!!
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 10
HighHigh--Definition Video StreamingDefinition Video Streaming・6 High-definition video streaming・Total throughput of around 80 Mbps
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 11
Round Trip DelayRound Trip DelayCN
simulatorServer
eNode BUE
Ping
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 12
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 13
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 14
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 15
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 16
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 17
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 18
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 19
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.
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 20
NTT DOCOMO NTT DOCOMO LTE DeploymentLTE Deployment
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 21
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
Copyright© 2008 NTT DOCOMO, INC. All rights reservedTakehiro NakamuraJanuary 26, 2009 22
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 23
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 24
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)
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 25
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
Copyright© 2008 NTT DOCOMO, Inc. All rights reservedTakehiro NakamuraJanuary 26, 2009 26
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